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Патент USA US3030837

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April 24, 1962
3,030,827
F. H. MERWIN
MACHINE FOR DRILLING RIVETS
8 Sheets-Sheet A1
Filed Sept. 16., 1959
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April 24, 1962
3,030,827
F. H. MERWIN .
MACHINE FOR DRILLING RIVETS
8 Sheets-Sheet 2
Filed Sept. 16, 1959
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INVENTOR. ’
Frede/"10k f2’. Mem/vm
BY
ATTORNÃ' .Y
April 24, 1962
F. H. MERWIN
3,030,827
MACHINE FOR DRILLING RIVETS
Filed Sept. 16. 1959
8 Sheets-Sheet 3
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April 24, 1962
F, H. MERWIN
3,030,827
MACHINE FOR DRILLING RIVETS
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INVENToR.
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BY
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ATTORNEY;
April 24, 1962
3,030,82 7
F. H. MERWIN
A
MACHINE FOR DRILLING RIVETS
Filed Sept. 16, 1959
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INVENTOR
April 24, 1962
F. H. MERWIN
3,030,827 `
MACHINE FOR DRILLING RIVETs
Filed Sept. 16, 1959
8 Sheets-Sheet 6
BY
ßTTOEA/EXY
April 24, 1962
F. H. MERWIN
3,030,827
MACHINE FOR DRILLING RIVETS
Filed Sept. 16. 1959
8 Sheets-Sheet 7
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INVENTOR.
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Frede/'fkk fl. Me/'Wm
Á TTOENEYS
April 24, 1962
F. H. MERwIN
3,030,827
MACHINE FOR DRILLING RIVETS
Filed Sept. 16, 1959
8 Sheets-Sheet 8
,253
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INVENTOR.,
Frede/’Lck H. Me/"wlrz
BY
i Q `
ATTORNE YS
United States aten-t
d@21(26
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_
2.
according to the present invention, areiinslerted into the
supporting _holes from the backside of the dial, i.e. the
3,030,827
MACEHNE FDR DRILLING RIVETS
.
side away from the drilling means.
Frederick H. Merwin, Milford, Conn., assigner to Milford
_
g
When the articles are inserted in the dial, they are
carried from a loading station to -a drilling station by fro‘
tation of the dial. At the drilling station, a clamping
rod having an end approximating in si'ze and ‘shape the
top of the head of the article is advanced to engage the
Rivet and Machine Company, Milford, Conn., a cor
poration of Connecticut
Filed Sept. 16, 1959, Ser. No. 840,473
l 2S Claims.
3,030,327
Patented Apr. 24, 1962
(Cl. 77--22)
This invention relates to machines for Vaxially drilling
article and clamp the head thereof between itself and the
headed workpieces such as rivets, for instance.
This «application is a continuation-impart of my co
pending application Serial No. 689,639, ñled Gctober ll,
margin of the hole in the dial in which theharticle is
carried, so that at »the drilling station the article is held
against turning by thrust-like force applied in an axial
1957.
direction to the head of the article._
In the manufacture of headed fasteners such as hollow
or tubular rivets, pieces of solid stock of desired diam
,y
The hole in the dial or the bushing therein 'extends
clear through to the front side of the dial so that a `drill
may engage the article to operate upon it. The thickness
of the dial is suí‘licient to securely engage the shank of
the article to be worked on and hold it steady. The hole
receiving the article has a sliding lit with the shank of
eter are headed at one end to form blanks which are
later chucked ‘and drilled to produce a bore of desired
diameter and depth so that the resulting wall will have
the desired length and thickness. In chucking and hold
ing the blanks, much düculty has been frequently en 20 the article so that even the slightest shoulder between the
countered because radial force could not be applied to
head and the. shank will engage the margin of the l'lole
the shank of the rivet wi-th suñicient intensity to hold it
against being turned by the drill. This was because the
clamping 'force when sufficient to prevent turning caused
and also so that the hole to be drilled will be truly cen
tered in the shank.
ccording to the presentv invention, the article carrying
distortion of the Imaterial of the rivet shank so that as the 25 dial is readily attachable and removable from t-he machine
hole is being drilled the thin wall of the shank remaining
so that when a job has been finished the dial may be re
which is engaged by the clamping means is pressed onto
moved and a dial adapted for' the next job may be substi
the lands of the `drill and into the flutes causing the
tuted for it.
drill to be unduly worn and sometimes broken resulting
The drilling means according to the present invention
in substantial loss of operating time and increased costs 30 comprises a power driven carriage for advancing and re
due to the necessity of replacing damaged drills. The
tracting the drill, a chuck for a drill, `and means for ro
more metal removed by the drilling in relation to shank
tating the drill. To facilitate the removal and replace
diameter the greater the clamping 4force needed to hold
ment of the drill, means are provided for temporarily
the work and the more din‘ìcul-t the problem.
breaking the connection between the carriage and the
The present invention has obviated this serious difficulty 35 power means driving- it so that the carriage can be moved
in the manufacture of hollow rivets and like elongate
away yfrom the dial. As shown, the driving means for
articles having headed Shanks by merely supporting the
the carriage includes a cam cooperating with a follower
shank in a suitable bushing and clamping the head therein
on the carriage and the connection is broken by moving
by axial pressure, thus holding the article against being
rotated by the drill without applying any radial pressure
the follower out of the path of the cam.
40
y
Y
Preferably, two drill heads are provided, and these and
whatsoever on the head or the shank of the elongate
the drill bits therein are arranged so that when one drill
article. In this way any radial distortion of the material
is drilling a shallow hole in an article the other drill is
of the article is avoided and an accurate drilling opera
deepening the shallow hole in a previously drilled article,
tion may be per-formed in the shank and even in the head
thereby substantially reducing the time required to drill
of the article if desired. Since the clamping pressure ap 45 a deep hole. After the holes are drilled, an _ejector pin
plied is axial, much more pressure may be applied than
engages the article and pushes it towardV the back of the
dial and out of the nesting aperture. This ejecting device
if the pressure were radial and therefore more metal may
be removed by the drilling per unit of time than was
heretofore possible, and consequently increased produc
tion may be obtained by the use of the present invention.
50
is operated by a cam coordinated with those operating
the drill uni-ts.
According to the present invention, inspecting or prob
According to the present invention, the elongate articles
ing means are provided and as shown these arel associated
are held against rotating while being drilled by applying
with the ejecting device and are so shape'd and positioned
clamping force to the head of the elongate article by co
that, at a station following a drilling station, if the' hole
operating members, one engaging’the top of the head and 55 is not properly drilled or a piece of broken drilll re’fn'ains
the other engaging the shoulder formed between the head
in the hole the probing pin will attempt tov eject the piece
and the shank, the force being applied in a direction
from the dial, and in one form of the inventión it may' do
parallel to the axis of the article. It has been found that
so. Preferably, however, should the probing pin átte?npt
force so applied to the head of an article otherwise sup
to eject the article from the dial at an inspection' station,
ported in a bushing is effective to hold the article against
the article will strike a device and operate it to stopI tlîev
rotation even though the head is only slightly larger in
machine.
diameter than the shank, the only requirement being that a
Another feature of ¿the machine of the present inven
tion is lthe provi-sion of means for maintaining the articlesv
perceptible shoulder exists for engagement with one of
the cooperating clamping members.
v
in the nesting apertures again-st unintentional dislodge
According to the present invention, in the form shown, 65 ment between stations. This may, as shown, be in the
the elongate articles -arev hopper fed to a transfer position
where they are transferred to holes, preferably in bush
ings, in a vertical dial which on rotation carries the
lform of cam means engaging the tops of the heads of
articles step-by-step to several stations. Power-operated
drilling means are located at the front side of the dial to 70
engaged by the clamping rods.
Still another feature v`of the invention resides in a
approach and `engage the articles held in the dial` Con
trary to normal practice in dial feed machines, the articles,
modification of the machine wherein a drill assembly is
positioned at the reverse side of the article carrying dial
the elongate articles asl they travel from station to station
to return the article to its position in the dial so as to be
3,030,827
3
4
to facilitate the boring of the headed ends of the rivets
erally a rivet drilling machine constructed in accordance
with the invention.
The drilling machine A, illustrated in FIGS. 1 through
or the like.
According to this modification of the invention, a
power driven drill, having a separate cooperatively op
15, includes a frame B, a drive system C, a dial and dial
erated rivet head clamping member, is disposed sub
support unit D, Ia dial indexing mechanism E, a work
stantially parallel and spaced from the rivet head clamp
supply mechanism F, a work clamping mechanism G,
ing rods for reciprocating movement toward and away
a drilling unit H, and an inspection and ejection mecha
from the dial in relation to the indexing thereof and
nism I.
_
the operation of the drills at the obverse side of the
Fl-‘ame
dial for drilling the headed ends of the elongate articles. 10
The frame B has a horizontal bed 30 supported at its
Other features and advantages will hereinafter appear.
opposite ends on legs 31 and a pair of spaced, parallel,
In the accompanying drawings
FIGURE 1 is a plan view of one embodiment of the
present invention with parts broken away for convenience
upstanding ribs 32, 33 secured to the bed 30, and coex
tensive therewith.
of illustration.
FIG. 2 is a fragmentary front view of a portion of the
Drive System
The drive system C as illustrated in FIGS. l and l2
includes a variable speed drive motor 34 mounted on
one end of the frame B and a transfer shaft 35 sup
mechanism for operating the clamping rods.
FIG. 3 is a fragmentary end view, partly in section,
of the drilling heads and inspecting mechanism.
in bearing blocks 36 carried by the ribs 32, 33,
FIG. 4 is a fragmentary plan view, partly in section, 20 ported
and bearing block 37 secured to the bedî30. A pulley
showing the drilling heads and the mechanism for moving
them toward and from the work.
FIG. 5 is a front View of the parts shown in FIG. 4,
with parts omitted for convenience of illustration.
FIG. 6 is a fragmentary end view of a portion of the
machine showing the mechanism for indexing the dial.
FIG. 7 is a transverse section taken on the line 7--7
38 is mounted on one end of the shaft 3S and is con
nected by a drive belt 39 to the drive motor 34. A
second shaft 40 extends perpendicularly to the shaft 35
and is supported in bearing blocks 41 mounted in spaced
relation on the frame bed 30. The shafts 40 and 35
are operatively connected by a bevel gear drive 42.
of FIG. 8, with parts omitted for convenience of illus
Dial and Support Therefor
tration.
The dial and dial support unit D includes, in the ern
FIG. 8 is a front elevation, partly in section, showing 30 bodiment illustrated (see FIGS. 1 and 8), a casting 43
the dial, part of the feed mechanism, the clamping
plungers, and the means for indexing the dial, with parts
broken Iaway and in section for convenience of illustra
tion.
FIG. 9 is a fragmentary plan view showing the dial,
the `article transfer means, the clamping plungers, and
the head drilling assembly, partially broken away and in
`secured to the frame bed 30 adjacent one end thereof.
A dial 44 is mounted on one end of a shaft 45 jour
naled in the casting 43 and is provided with a plurality
of circumferentially equispaced bores 46 arranged cir
culaIly about the center thereof. A bushing 47 is posi
tioned in each of the bores 46 and is flanged as at 48
to engage in a recess 49 formed at one end of the bores
section for convenience of illustration and shown on a
46 to assist in retaining the bushing 48 in the dial 44.
somewhat larger scale than in FIG. l.
The bushing 48 has an axial bore 50 extending there
FIG. 10 is a fragmentary detail View showing a work 40 through to receive a workpiece 51 therein.
piece being -held in place in a portion of the dial by the
As stated above, a feature of this invention is the pro
end of the rivet inserting rod.
vision of means for clamping the workpiece in a posi
FIG. 1l is a fragmentary transverse section of a por
tion for a drill operation Awithout applying radial pressure
tion of the machine approximately on line 11--11 of
to the shank or other part of the elongate workpiece. Ac
FIG. 1.
cordingly, as shown herein, after the rivet is placed in a
45
FIG. l2 is a fragmentary end view of a portion of the
bore 50 in the dial 44 and the dial 44 is moved to drilling
machine showing the means for driving the drill units.
position, -it is clamped by axial pressure applied to the
FIG. 13 is a front elevation of the feed and transfer
head thereof by a work clamping mechanism G which
mechanism for the articles, with parts broken away and
is best illustrated in FIGS. 1, 8 and 9'.
in section for convenience of illustration.
The mechanism G includes, in the form shown, a cy
FIG. 14 is a fragmentary plan view of a detail show 50
lindrical slide 52 mounted for longitudinal reciprocatory
ing the mechanism for stopping the machine in case a
movement in a bearing 53 mounted in the casting 43
hole is not drilled to desired depth or a broken drill is
above the shaft 45. A clamping pin 54 is provided for
left in the hole.
engaging the workpiece 51 positioned in the dial 44 and
FIG. 15 is a fragmentary end view showing the dial
55 extends between the end 55 of the slide 52 and the dial
and the inspection device of FIG. 14.
44. The clamping pin 54 is supported in aligned rela
FIG. 16 is a fragmentary sectional view taken on line
tion with the slide 52 by means of an adapter block 56
16-16 of FIG. 15.
secured to the slide 52 by a fastener 57. The clamping
FIG. 17 is an end elevation of an attachment form
pin 54 may be of any >suitable size or shape and the
ing a modification of the basic machine.
FIG. 18 is l‘a plan view of the device illustrated in 60 adapter block 56 would be formed to cooperate there
with. Minute adjustments of the position of the clamp
FIG. 17.
ing pin 54 with respect to the workpiece 51 may be pro
FIG. 19 is a fragmentary end view, partially in section,
vided for when needed by means of an adjusting nut 58
of the rivet head clamping rods and head drilling assem
bly.
threaded onto the clamping pin 54 and engaged against
article holding dial, head clamping rods and head drilling
ing pin 54 in the adapter block 56 in adjusted position
therein.
FIG. 20 is a fragmentary side elevational view of the 65 the adapter block 56.
assembly.
A set screw 59 locks the clamp
The slide 52 is formed with an axial bore 60 opening
FIG. 21 is a fragmentary side elevational view, partially
through the end thereof opposite the clamping pin 54
in section, of the rivet head drilling assembly.
70 for telescopically receiving the reduced end portion 61 of
FIG. 22 is a fragmentary View, in elevation, of the
a connecting rod 62. The connecting rod 62 is supported
drive means for the rivet head drilling assembly.
for longitudinal sliding movement in a bearing 63 mount
Referring now to the drawings in detail, wherein like
ed in casting 43. In order to provide an adjustable
reference characters indicate like parts throughout the
resilient clamping pressure between the clamping pin
several figures, the reference character A indicates gen 75 54 and the workpiece 51, the slide 52 and the reduced
3,030,827
6
5
end portion 61 are connected for limited axial movement
The vertical conveyer 102 is secured to the pedestal
by a pin 64 projecting through the slide 52, the bore
100 by securing elements 106. A dovetail slide block
60 and a longitudinal slot 65 formed in the reduced end
107 is mounted on the pedestal 100 for transverse hori
zontal sliding movement and is provided with a cam fol
portion 61 and through which the pin 64 extends. The
connecting rod 62 is resiliently linked to the clamping
lower -roller 108 at one end engaging an internal cam
face 109 of a cam wheel 110 secured to the shaft 40.
pin 54 by means of a coil spring 66 which encompasses
The slide block 107 is biased toward the cam face 109
the reduced end portion 61 and engages against the end
67 of the slide 52 opposite the clamping pin 54. The
opposite end of the spring 66 is adjustably connected to
and the conveye-r 102 by means of a spring 111 which
extends between the pedestal 100 and a spring pin 112
the reduced end portion 61 by means of a screw sleeve 10 carried by the slide block 107. A transfer bar 113 is
secured to the slide block 107 so as to extend beneath the
63 threadably mounted on an enlarged threaded portion
conveyer 102.
69 formed on the reduced end portion 61 at the end
The transfer bar 113 has a longitudinally extending
thereof opposite the slot 65. The pin and slot connec
horizontal slot 114 opening through the upper surface
tion between the slide 52 and the -reduced end portion 61
permits the spring 66 to form the entire driving con 15 thereof and arranged in aligned relation to the slot 103
to permit the heads 89 of the workpieces 51 to slide
nection between the slide 52 and the connecting rod 62.
therein. A second slot 115 intersects the slot 114 at the
The connecting rod 62 is connected to a drive mech
outer end thereof with its axis extending perpendicularly
anism by means of an enlarged bifurcated end portion
thereto. The second slot 115, in the retracted position
70 having a segment block 71 mounted therein for pivotal
movement on a pivot pin 72 extending therethrough. 20 of the transfer bar 113, is aligned with the slot 104
in the conveyer 102, as illustrated in FIGS. 9 and ll.
A cam actuator member 73 is provided for reciprocating
A workpiece 51 engages in the slots 114, 115 as illus
the connection rod 62 and is operatively associated there
trated in FIG. 13, and moves with the transfer bar 2113
with by means of a cam slot 74 in which the segment
to a position laterally offset with relation to the vertical
block 71 engages. The cam actuator member 73 is car
conveyer 102. The upper surface of the transfer bar 113
ried on a transverse shaft 75 journaled in bearings 76
retains the remaining workpieces 51 in t-he vertical con
carried by the ribs 32 and 33 respectively.
veyer 102 during the horizontal reciprocation of the
Means are provided for oscillating the shaft 75 and
transfer bar 113.
may include, as -illustrated in the preferred embodiment
The workpieces 51 are removed from the transfer bar
of the invention, as shown in FIG. 2, a slotted shoe 77
secured to the end 73 of the shaft 35 and in which a 30 113 by a pair of pickup fingers 116, 117 which are pivot
ally mounted at 118 to a pickup finger slide block 119.
yoke 79 slotted at S0 engages for sliding movement. A
The slide block 119 is supported for vertical sliding move
cam slot 81 formed in the outer face of the pulley 30
ment in a bearing 120 mounted on the pedestal 100. The
pickup fingers 116, 117 are biased into engagement with
each other by means of a coil spring 121 extending there
cooperates with a cam follower roller 82 carried on the
yoke 79 to reciprocate the yoke 79 longitudinally. A rod
83 extends longitudinally from the yoke 79 toward the
between. The pickup fingers 116 and 117 are recessed
adjacent their lower end to provide a pickup socket 122.
An inverted V-block 123 is carried by the transfer bar
on. The rod S3 is connected to the shaft 7S by means of
113 in underlying relation to the slot 115 to support the
a crank arm 87 carrying a pivoted sleeve 88 thereon
through which the threaded end S4 of the rod 83 ex 40 shank 105 of the workpiece 51 as it is engaged by the
pickup socket 122 of the pickup lingers 116, 117.
tends. The rod 83 is resiliently cushioned with respect
A bell crank 12dI is pivotally mounted on the pedestal
to the crank arm 87 by means of a coil spring 89a en
100 and has a cam follower roller 125 mounted on one
compassing the rod 83 and engaging the stop nuts 85
shaft 75 and has the end adjacent the shaft 75 threaded at
84 to receive adjustable stop nuts 05, 86 positioned there
at one end and the pivot sleeve 83 at the other.
In the event that it is necessary to clamp the workpiece
51 in more than one position of the dial 44, a second
end thereof engaging a cam 126 carried by the cam wheel
110. The opposite end of the bell crank 124 is secured to
the upper end of the slide 119 through an adjustable eccen
clamping pin 54a, see FIG. 9, of identical construction
and mounting to that of the clamping pin 54 is as shown
positioned in laterally spaced parallel relation to the
tric connection 127 to permit the adjustment of the sliding
lim-its of the slide block 119; A coil spring 128 extends
between the bell crank 124 and the pedestal 100 to nor
50 mally urge the slide block 119 toward the transfer bar
113 and the cam follower roller 125 toward the cam 126.
, As the clamping pins 54, 54a arev brought into clamp
The pattern of the cam 126 acting on the cam follower
ing Contact with the head S9 of the workpiece 51, axial
roller 125 is such that the slide block 119 moves down
pressures are brought to bear on the dial 44. To counter
clamping pin 54.
act the pressures against the dial 44 a backup plate 90
is positioned in engagement with the outer edge of the
wardly to cause the pickup ñngers 116, 117 to grasp the
shank 105 of a workpiece 51 in the socket 122 and then
face of the dial 44 opposite the clamping pins 54, 54a.
move upwardly a distance sufficient to clear the shank 105
`from the slot 115 to permit the transfer bar 113 to be
moved to the retracted position illustrated in FIG. l1
by the cam face 109.
After the transfer bar 113 is removed from beneath
The backup plate 90 is mounted on the outer end of a
bar 91 secured to the casting 43 by means of secu-ring
elements 92.
Work Supply Mechanism
so
the pickup fingers 116, 117, they are moved downwardly
to align the workpiece 51 with one of the `bores 50. A
work insertion plunger 129 is mounted for longitudinal
FIGS. 9, 10, ll and 13, includes a pedestal 100 secured
reciprocation in the casting 43 and is provided on one end
to the bed 30 adjacent the upstanding rib 32. A hopper,
a fragment of which is shown at 101, serves as a reservoir 65 with a work-engaging pin 130 adjustably secured thereto.
A coil spring 131 extends between the casting 43 and a
for a plurality of workpieces 51 and may -be of any con
The work supply mechanism F, best illustrated in
ventional construction capable of feeding the workpieces
stop 132 carried by the plunger 129 to normally spring
urge the plunger 129 in a direction to engage the head
51 into a vertical conveyor chute 102.
89 of the workpiece 51 held in the socket 122 of the
The vertical ccnveyer chute 102 has a slot 103 to re
ceive the head 89 of the workpiece 51 and a slot 104 70 pickup fingers 116, 117.
A rocker arm 133 is pivotally mounted on the pedestal
of narrower width than the slot 103 to permit the shank
100 and engages at one end a cam 134 carried by the
105 of the workpiece 51 to extend therethrough. The
shaft 40. The opposite end 135 of the rocker arm 133
vertical conveyer 102 supports the workpieces 51 in
engages a collar 136 adjustably mounted on the plunger
aligned relation with each head 89 resting on head 89
lying therebelow.
75 129 to retract the plunger 129 out of engagement with the
3,030,827
7
workpiece 51. A coil spring 137 normally biases the
rocker arm 133 into operative engagement with the cam
134.
Thus it can be seen that the work-engaging pin 130
I is moved into workpiece 51 work-engaging position by
the spring 131 and is retracted by the rocker arm 133.
The timing of the cam 134 is such that the work-engaging
130 is released by the rocker arm 133 to resiliently en
8
desired.
The end of the link 167 opposite the follower
169 has an adjustable contact screw 171 for engagement
with the end 166 of the link 163. A lock nut 172 se
cures the adjustable contact screw 171 in locked relation
to the link 167. Oscillating movement of the link 167
about its pivot 168 will move the link 163 and positively
retract the pin 162 from the disk 140.
A connecting rod 173 has a yoke 174 formed adjacent
one end thereof and engaging in a slotted shoe 175
gage the workpiece 51 when the pickup fingers 116, 117
have positioned the workpiece 51 in aligned relation to 10 secured to the shaft 40. A cam 176 engages a cam fol
one of the bores 50 of the bushings 47.
The work
lower roller 177 journaled on the connecting rod 173
engaging pin 130 presses the workpiece 51 into the bore
in a manner as illustrated in FIG. 6. The opposite end
50 until the head 89 engages the pickup fingers 116, 117.
of the connecting rod 173 has a pivot pin 178 journaled
At this time the cam 126 will move the pickup lingers
therein for engagement with the index rocker arm 155.
116, 117 upwardly out of engagement with the workpiece 15 The pin 178 can be readily adjusted by means of a screw
51 and the plunger 129 will complete the insertion of
179 to control the oscillation arc of the rocker arm 155.
the workpiece 51 in the bushing 47.
The connecting rod 173 as shown has a turnbuckle
180 for adjusting the length thereof. A spring 181
Indexing M eclzanism
extends from the bearing 41 to the pivot pin 178 for
A dial indexing mechanism E, in the form as best illus 20 normally biasing the connecting rod 173 into contact
trated in FIGS. 1, 6, 7 and 8 includes an index disk 140
secured to the end portion of the shaft 45 opposite the
dial 44. The disk 140 has a plurality of index bores 141
equal in number to the bores 46 in the dial 44 and ar
ranged in circumferential equispaced relation. An index
lock housing 142 is journaled on a cylindrical boss 143
extending from the end of the casting 43 opposite the
with the cam 176 to effect the desired operation. The
cam 176 is constructed to oscillate the index rocker arm
155 from one bore 141 to the next adjacent bore 141
and then successively move the disk 140 by moving one
bore 141 at a time. As each step-by-step movement of
the rocker arm 155 is completed and the pin 162 retracted,
the locking pin 149 moves forward to lock the indexing
dial 44.
disk 140 in indexed position while the rocker arm moves
A lug 144 integrally formed on the casting 43 extends
upwardly from the plane of the boss 143. The housing 30 in a reverse direction to engage the next preceding bore
141. The adjusting bolts 146 provide a means whereby
142 is provided with a pair of ears 145 engaging over
the locking pin 149 can be adjusted to assist in aligning
opposite sides of the lug 144 and slightly spaced there
the dial 44 with the work supply mechanism F and the
from. A pair of set screws 146 are threaded through the
work clamping mechanism G.
ears 145 engaging opposite sides of the lug 144 to adjust
the housing 142 with respect to the casting 43. Lock 35
Drill
nuts 147 are mounted on the set screws 146 to secure them
in adjusted
Cap screws
the housing
the housing
position with relation to the housing 142.
148 extend through slightly oversize holes in
142 and into the casting 43 to positively lock
142 to the casting 43 in adjusted position.
40
A pin 149 mounted for sliding movement in a bush
In accordance with another feature of the invention
the workpieces 51 while clamped in the dial 44 are axially
drilled by means of the drilling unit H positioned in
general axial alignment with the dial 44 and includes a
support housing 182, see FIGS. 1, 3, 4 and 5, mounted
the work clamping mechanism G.
on the bed 30 between the ribs 32 and 33. The hous
ing 182 as shown has a drill spindle holder 183 longi
tudinally slidably mounted therein on bearings 185. A
drill spindle 186 journaled in the drill spindle holder on
bearings 187, 188 is secured in the drill spindle holder
183 by means of retainer rings 189, 190 respectively.
A pulley 191 secured to the rear end of the drill
spindle 186 provides means for rotating the spindle 186.
A chuck 192 is secured to the drill spindle 186 by means
extending longitudinally from the disk 140 and is se
195 chucked therein.
ing 150 in the housing 142 is formed hollow and is urged
toward the index disk by a coil spring 151 telescoped
therein and engaging at its opposite end a plate 152. The
pin 149 has the forward end thereof beveled as at 153
to engage in the outwardly beveled ends 154 of the bores
141 in the disk 140. The pin 149 by engaging in the
bore 141 locks the disk 140 in position so that the dial
44 is aligned with the work supply mechanism F and
An index rocker arm 155 is journaled on a hub 156 50 of an elongate bolt 193 and a nut 194 and carries a drill
cured thereon by a nut 157 and washer 158 engaged over
the end of the shaft 45. The shaft 45 has an axial bore
159 extending inwardly from the end thereof supporting
the disk 140 and having a coil spring 160 mounted there
in. A pin 161 is slidably arranged in the bore 159 and
is urged by the spring 160 in a direction away from the
dial 44. A pin 162 is slidably arranged in the outer
end portion of the rocker arm 155 in aligned relation to
the bores 141.
A link 163 is pivoted at 164 to a bifur
cated ear 165 yformed on the index rocker arm 155.
The
end 166 of the link 163 engages against the pin 161 so
that the spring 160 will normally urge the pin 162 through
the rocker arm 155.
The pin 162 engages through a
A second drill 195:1 may be provided, as illustrated
in the drawings, when drilling is desired at more than
one station of the dial 44 and in this case the drill 195a
is carried in an identical mechanism to that supporting
the drill 195 in laterally spaced parallel relation thereto.
To provide means for reciprocating the drill Spindle
holder 183 and in turn the drills 195, 195a, a bracket
202 is pivotally mounted on a pin 203 threaded into the
drill spindle holder 183. A second pin 204 engages
through a slot 205 in the lower end of the bracket 202 to
secure the bracket 202 ñrmly to the drill spindle holder
183. The bracket 202 is locked in position by the
screws 203, 204 which are tightened by turning the handles
selected one of the bores 141, pressing the pin 149 out 05 206 thereon. The bracket 202 is provided with a cam
follower roller 207 engaging against one of a pair of
wardly therefrom, unlocking the disk 140 from the hous~
cams 208 and 209 carried by the shaft 35. Rotation
ing 142 and simultaneously locking the rocker arm 155
of the cams 208 and 209 respectively causes drill spindle
to the disk 140 so that movement of the rocker arm 155
holder 183 to longitudinally reciprocate in the hous
will cause a corresponding movement of the disk 140 and
consequently of the dial 44.
A link 167 pivoted at 168 to the bed 30 carries a cam
follower roller 169 on its outer end. A face cam 170
secured to the terminal end of the shaft 40 in engagement
with the cam follower roller 169 moves the link 167 as 75
ing 182.
A coil spring 210 extends from the bed 30 to each of
the drill spindle holders 183 to maintain the cam follower
roller 207 in engagement with the cams 208 and 209
respectively. The brackets 202 are each provided with
a handle 212 by means of which the brackets can be
3,030,827
il
1@
swung on their pivot pins 203 to disengage the cam fol
lower rollers 2117 from the cams 2tlg, 209 so that the
chuck 192 can be quickly backed away from the dial 44
to permit the drills 195, 19551 to be replaced when broken.
Drive motors 213 and 214, see FIG. 12, are connected
the heads 89 of the workpieces 51 and cam them back into
the bushings 47 as they move from one indexed position
to the next in the sequential operation of the drilling ma
chine A. Obviously the camming attachment K is at
tached to the drilling machine A whenever it is found
respectively to the pulleys 191, by means of drive belts
21S and 216. The length of the drive belts 215, 216 is
to be imperative.
ln the operation ofthe invention a workpiece 51 is posi
such that reciprocating movement of the pulleys 191 may
occur without binding or disengagement thereof.
tioned in a bushing 47 individually by means of the con
Inspection, Ejection Mechanism
An inspection and ejection mechanism I includes, in
veyer 102, transfer bar 113, pickup fingers 116, 117 and
10 the plunger 129.
The dial 44 is then indexed one sta
tion and the drill 195 is moved by the cam 2119 a suñi
cient distance to partially drill the desired bore in the
workpiece 51. Simultaneously another workpiece 51 is
the embodiment shown, a longitudinally slidable shaft
inserted by the plunger 129 in the next adjacent bushing
217, see FlGS. 3, 4 and 5, supported in the support
housing 182. The shaft 217 is positioned substantially 15 47. The dial 44 is then indexed again and the inspection
pin 226 is engaged in the partially drilled bore, checking
beneath the drill spindle holders 183 in parallel relation
it for depth and foreign matter, while simultaneously the
thereto. A bracket 218 is secured to the end of the
previously described drilling, lilling operations are again
shaft 217 opposite the dial 44 and carries a cam follower
roller 219 thereon engaging a earn 22d mounted on the
shaft 35 between the cams 2118, 209. A coil spring 221
extends from the bracket 218 to the bed 341 and normally
carried out. The dial 44 is again indexed and the drill
195e completes the drilling of the bore to the desired
depth in the workpiece 51. The previously described in
biases the shaft 217 in a direction to maintain the cam
follower roller 219 in engagement with the cam 220.
spection, drilling and filling operations again take place
simultaneously therewith.
Upon the next indexing of the dial 44 the inspection
A plate 222 is secured to the end of the shaft 217
opposite the bracket 21S. A guide pin 223 is mounted 25 pin 228 inspects the completed bore in the workpiece S1
along with the simultaneous drilling, inspection and filling
on the plate 222 and extends in parallel relation to the
steps previously described. The ejection pin 230 also
shaft 217 into a bore 224 to hold the plate 222 against
carried on the plate 222 simultaneously is ejecting the
rotation about the shaft 217. The plate 222 is provided
drilled and inspected workpieces 51 at the last station in
with a ñnger 225 extending upwardly between the chuck
192 and carrying an inspection pin 226 thereon. A second 30 the indexing operation. The clamping pins 54, Säle are
moved into engagement with the head S9 of the work
linger l22’7 extends outwardly from the plate 222 on
pieces 51 to secure the workpieces S1 during the drilling
the opposite side of the chuck 192 from the finger 225 and
operation and prevent rotation thereof.
carries a second inspection pin 22S thereon. A third
lt should be understood that where a threaded bore _is
linger 229 extends outwardly from the plate 222 below
the linger 227 and carries an ejection pin 230 thereon. 35 desired in the workpiece 51, the drill 195:1 can be re
placed with a tap (not shown) or a tap can be added as
The inspection pin 226 is arranged in aligned relation
to a bore Si) in the dial 44 lying between the bores 511
aligned with the drills 195, 195a. The inspection pin
22S is aligned with a bore Sil adjacent the bore Sil aligned
with the drill 195e, and the ejection pin 2313 is aligned 40
with the bore Sil next to the bore 50 aligned with the
inspection pin 22S. Movement of the plate 222 toward
the dial 44 will cause the inspection pins 226, 228 to
as rivets or the like, be bored at their headed> end alone
or at both their head and shank ends, such operations be
195e and the ejection pin 230 to engage in the bore of
ing preferably accomplished during a single pass through
the drilling machine, thereby reducing the time required
the workpiece 51 already completed. The length of the
ejection pin 230 is such that the workpiece 51 engaged
thereby will be moved out of the bushing 47, complet
ing the operation of the drilling machine A thereon.
for their manufacture and eliminating unnecessary han
dling.
In the event that one of the drills 195, 195a become 50
will engage the workpiece S1 and press it out of the
Referring now to FIGS. l, 9, ll, 19 and 20 through
22, a drilling assembly L for boring the headed ends of
workpieces 51 is shown as a modification of the invention.
It is often necessary that elongate headed articles, such
engage in the bores drilled by the respective drills 195,
broken and lodged in one of the workpieces S1, or for
any reason the drillingr operation is not completed, the
inspection pins 226, 228 on moving toward the dial 44
another station carried by the support housing 182.
Rivet Head Drilling Assembly
n
The drilling assembly L, which as shown is positioned
at the reverse side of dial 44 and is adapted to drill the
headed ends of the articles at one station during the in
dexing of the dial, includes a support housing 237, that
forms part of casting 43 and is positioned to the side of
bore 51D in the bushing 47. The workpiece 51 will engage 55 and parallel work-clamping means G. The housing 237,
as shown most clearly in FlG. 21, has a drill spindle
holder 238 longitudinally slidably mounted therein on
bearings 239. A tubular drill spindle 2410 journaled in
a spring 233 shown in FIG. 14. The opposite end of
the rocker arm 231 pivotally carried on a bracket 232
mounted on the rib 33 and move it against the tension of
the rocker arm 231 is positioned to engage a microswitch
the drill spindle holder 233 on bearings 241 and '242 is se
234 carried by the bracket 232 to automatically interrupt 60 cured in the drill spindle holder by means of an elongate
chuck mounting member 2413 extending through the
the power of the drilling machine A to permit the neces-'
spindle and keyed thereto. The chuck mounting member
sary corrections to be made.
243 is provided at one end with a shoulder 244 adapted to
Cumming Attachment
Referring now to FIGS. 17 and 18, a camming attach
ment K is illustrated` as a modiñed form of the invention.
engage the bearing 241 whereby the spindle is secured
against movement through spindle holder.y 233 and is
65 formed at its opposite end with threads adapted to re
ceive locking nuts 245 for locking the spindle in the
In drilling workpieces 51 to relatively great length, vibra
spindle holder.
tion tends to partially dislodge the workpieces 51 from
A pulley 246 secured to the rear end of the drill spindle
the bores 51) between the clamping pins 54, 54a suf
ñciently so as to engage the clamping pins 511, 54a before 70 246 provides means for rotating the spindle. A chuck
247 is secured to the drill spindle 246 at its opposite end,
by means of the engagement of a bolt 248 in an axially
formed bore 249 provided in the chuck mounting mem
mounted to the bed 30‘ and having a plurality of carn
ber 243, and carries a drill 250.
ming surfaces 236 arranged between the bores 50 when
aligned with the clamping pins 54, 54a so as to engage 75 In order to provide means for reciprocating the drill
becoming aligned therewith.
The camming attachment K comprises a plate 235
3,030,827
11
12
v
spindle holder 238 and in turn the drill 250, a bracket
arcuately spaced work-nesting apertures extending there
251 having a dovetail slot 252 therein is mounted on the
upstanding rib 33 secured to the machine bed 30. An
through and having a sliding lit with the shank of said
workpieces; ydrilling means located at the obverse side
operating slide 253 is slidably engaged in dovetail slot
of the dial; means for feeding workpieces one at a time
to a loading station located at the reverse side of the
dial; means for transferring a workpiece from the load
252 for reciprocation therein and has an extension 253a
connected to the end 238a of drill spindle holder 238
for imparting reciprocating movement thereto. The slide
ing station longitudinally into a nesting aperture in the
dial so that the shank of the workpiece lies in said aper
length to a dog 255 having a cam follower ‘256 in en
ture and the head thereof projects from the reverse side
gagement with the inner cam face 257 of a cam 258 10 of the aperture; means for advancing the dial step-by-step
carried by the shaft 35. It will be seen that rotation of
to carry the workpieces to a work station; and means at
shaft 35 imparts movement to slide 253 through the cam
said work station for clamping the workpiece against
258, thereby reciprocating the drill spindle holder 238
rotation in the nesting aperture, said means consisting
253 is connected through a linkage 254 of adjustable
toward and away from dial 44.
solely of cooperating parts engaging between them the
The housing 237 of drill assembly L is provided with 15 top and the underside of the head of the workpiece, and
a pair of outwardly projecting straps 259, secured thereto
means including resilient means for producing relative
by bolts 25911, and adapted to slidably carry a rod 26t).
movement between said cooperating parts parallel to the
The rod 260 is formed with an integral plate 261 extend
axis of the workpiece to apply yielding gripping pressure
ing normal thereto, the plate being adapted to remov
to the head solely in a direction parallel to the axis of
ably carry a head clamping member -262. The head
the workpiece to hold the latter against turning in the
clamping member 262, which is secured to plate 261
dial.
through bolts 263 and is adapted to be removed there
2. The drilling machine as defined in claim l, in which
from for the substitution of clamping members as re
the cooperating parts engaging the head of the work
quired, is formed with a notch 264 through which drill
piece include a rod the end of which directly engages
250 may extend during the drilling of the headed end 25 the top of the head, and the margin of the nesting aper
of a workpiece 51 while the clamp is retaining the work
ture in which the workpiece is supported engaging the
piece in position in dial 44. A rod 265 is connected to
underside of the head.
plate 261 and extends slidably through a bore 266 in slide
3. The drilling machine as deiined in claim l, in which
extension 253a. The rod 265 carries a coil spring 267
the drilling means are advanced and retracted relative to
which normally biases slide extension 253a and head 30 the workpiece by power-operated means including a cam
clamping member 262 in opposite directions. The end of
and follower, and there are manually operated means for
rod 265 which is disposed outwardly of the slide extension
moving the follower out of the path of the cam to permit
253:1 is threaded to receive adjusting nuts 268 for adjust
further retraction of the drilling means and facilitate the
ing the tension of spring 267. It should here be noted
removal and replacement of drill bits.
that coil spring 267 also functions to maintain follower 35
4. The drilling machine as deiined in claim l, in which
256 in close engagement with inner cam face 257 of
cam 258.
at the obverse side of the dial there are sensing means
engageable with the drilled workpiece to determine
A drive motor 269 is connected to the pulley 246 by
whether the hole therein is drilled to desired depth and
means of a drive belt 270 for rotating the spindle 240,
is free of obstructions, said sensing means applying a
whereby the drill is operated. The drive belt 270 is, 40 force to eject an undrilled or defectively drilled work
as was described with the drilling unit H, of such a length
piece from its nesting aperture.
that reciprocating movement of the pulley 246 may occur
5. The drilling machine as defined in claim 4, in which
without binding or disengagement thereof.
there are means positioned to be engaged by a workpiece
In the operation of drilling assembly L, after a work
moving under force applied `by said sensing means for
piece 51 has been inserted in the dial 44 and the dial is
stopping the operation of the drilling machine.
indexed to carry the workpiece past the shank drilling
6. The drilling machine as deiined in claim 5, wherein
stations as aforedescribed, the shaft 35 «rotates cam 258
the means for stopping the operation of the machine
to operate slide 253 and shift drill spindle holder 238
includes an electric switch.
toward the dial into drilling position. As the slide is
7. The drilling machine as defined in claim 1, in which
shifted to drilling position and the drill 250 engages
there are ejecting means at the obverse side of the dial
the headed end of the workpiece 51, the spring 267 on
to remove a drilled workpiece from the dial at an un
rod 265 is compressed to force the head clamping mem
loading station.
ber 262 into engagement with the head of the workpiece
8. The drilling machine as deiined in claim 4, in which
whereby the workpiece is clamped in the dial. Con
there are ejecting means movable with said sensing means
tinued movement of the slide increases the tension of
to remove a drilled workpiece from the dial at an un
spring 267 and the pressure applied by the clamping
member 262 on the head of the workpiece so that the
workpiece cannot be moved during the drilling opera
tion.
Thereafter, as the cam is continued to be rotated
by shaft 35 the slide 253 is shifted away from dial 44
to early the drill 250 out of engagement with the work
piece 51 and release the clamping pressure of member
262. The dial 44 is then indexed to shift the workpiece
to an ejecting station. It should here be noted that the
operation of drilling assembly L may be so timed that
the headed end of the workpiece is drilled at the eject
ing station just prior to the ejection of the workpiece
loading station.
9. The drilling machine as defined in claim 2, in which
there is an adjustable spring connected to the rod which
when compressed causes the rod to apply a predeter
mined yielding force to the top of the head of the
workpiece.
l0. The drilling machine as defined in claim 2, in which
the rod comprises two telescoping parts and there is a
compression spring between them whereby the two parts
may move relatively, one part having a tip engaging the
head of the workpiece and a power-operated cam engag
ing the other part.
from the dial.
ll. The drilling machine as defined in claim 2, in
Variations and modifications may be made within the
which the dial is mounted on the end of a shaft and
scope of the claims and portions of the improvements 70 there are means engaging the dial on its obverse face
may be used without others.
adjacent the marginal portion thereof to counteract the
I claim:
force transmitted to the dial by said rod in clamping
l. A machine for drilling elongate cylindrical work
pieces having a shank and a head at one end thereof
comprising a work-supporting dial having a plurality of
the workpiece against rotation in the dial.
l2. The drilling machine as defined in claim l, in
which there are a plurality of work stations around the
3,030,827
13
i4
dial and the `drilling means comprises a plurality of
separately driven drill spindles in front of their respec
tive work stations, and the work-clamping means com
prises separate cooperating clamping means, one for each
drill spindle and axially aligned therewith, and there are
separate means for advancing and retracting each drill
underside of the head of the workpiece, and means in
cluding resilient means for producing relative movement
between said cooperating parts parallel to the axis of
the workpiece to apply yielding gripping pressure to the
head solely in a direction parallel to the axis of the work
piece to hold the latter against turning in the dial.
19. A machine for drilling elongate cylindrical work
spindle individually relative to the workpiece.
pieces having a shank and a head at one end thereof
13. The drilling machine `as defined in claim l2, in
comprising a work-supporting dial having a plurality of
which there are separate means for operating each co
operating clamping means.
10
14. The drilling machine as defined in claim l2, in
which the drilling spindles are spaced leaving at least
one work nest between adjacent drilling spindles and
there are inspection probes one for probing the hole
drilled by each drill, and means for advancing and re 15
arcuately spaced work-nesting apertures extending there
through and having a sliding fit with the shank of said
workpieces; head drilling means located at the back side
of the dial; means for feeding workpieces one at a time
to a loading station located at the back side of the dial;
means for transferring a workpiece from the loading
station longitudinally into a nesting aperture in the
tracting said probes operating coordinately with said drill
dia-l so that the shank of the workpiece lies in said
ing spindles.
aperture and the head thereof projects from the back
l5. The drilling machine as defined in claim 14, in
side of the aperture; means for advancing the dial step
which an ejector pin is operated coordinately with said
20 by-step to carry the workpieces to a work station; and
probes.
means operable at said work station for clamping the
16. A machine for drilling elongate cylindrical work
workpiece against rotation in the nesting aperture, said
pieces of the type having a shank and a head formed
clamping means consisting solely of cooperating parts
on one end thereof comprising a work-supporting dial
engaging between them the top and the underside of the
having a plurality of circumferentially spaced workpiece
nesting bores extending therethrough and having a slid 25 head of the workpiece, and means including resilient
ing fit with the shank of the workpieces with the head
thereof engaging the surface of the reverse side of said
means for producing relative movement between said co
operating parts parallel to the axis of the workpiece to
apply yielding gripping pressure to the head solely in a
direction parallel to the axis of the workpiece to hold
located on the obverse side of said dial; means for feed
ing workpieces one at a time to a loading station located 30 the latter against turning in the dial.
20. The drilling machine as defined in claim 19,
on the reverse side of said dial; means for transferring
dial immediately adjacent said bores; drilling means
a workpiece from the loading station to a nesting bore
in said dial; means for advancing the dial step-bystep to
carry the workpieces to a work station; means at said
wherein the head drilling means are advanced and re
named means including an axially movable member en
tracted relative to the workpiece.
2l. The drilling machine as defined in claim 20‘,
tracted relative to the workpiece by power-operated means
including a cam and follower, and in which said clamping
work station for clamping the workpiece against said 35 means are operably coupled with said head drilling means
for operation thereby as the latter is advanced and re
dial to lock said workpiece against rotation, said last
gaging the head of said workpiece to apply pressure
thereto solely in a direction parallel to the axis of said
workpiece; and means including a plurality of cam faces
positioned adjacent said dial for engaging the heads of
said workpieces between said stations to maintain said
workpieces completely seated in said bores.
17. A drilling machine as defined in claim l, in which
wherein said head drilling means are connected to said
power-operated means by an operating slide member,
and in which said clamping means are operably connected
to said slide for operation thereby.
22. A machine for drilling elongate cylindrical work
pieces having a shank and a head at one end thereof
there is a head drilling assembly positioned at the reverse 45 comprising a `work-supporting dial having a plurality of
arcuately spaced work-nesting apertures extending there
side of said dial and adapted to be reciprocated toward
through and having a sliding fit with the shank of said
and away from a workpiece nested therein, said drilling
workpieces; drilling means located at the obverse side
assembly including a head drilling means and having a
of the dial; head drilling means located at the reverse
self-contained head clamping means adapted to be oper
ated in response to the reciprocation of said assembly, 50 side of the dial; means for feeding workpieces one at
a time to a loading station located at the reverse side
said clamping means cooperating with said dial for en
of the dial; means for transferring a workpiece from the
gaging between them the top and the underside of the
loading station longitudinally into a nesting aperture in
head of the workpiece and includin-g resilient means for
the dial so that the shank of the workpiece lies in said
producing relative movement between said cooperating
parts parallel to the axis of the workpiece to apply yield 55 aperture and the head thereof projects from the reverse
side of the aperture; means for advancing the dial step
ing gripping pressure to the head solely in a direction
by-step to carry the workpieces to a plurality of consecu
parallel to the axis of the yworkpiece to hold the latter
tive work stations; and means at each of said work sta
against turning in the dial.
18. A machine for drilling elongate cylindrical work
tions for clamping the workpiece against rotation in the
pieces having a shank and a head at one end thereof 60 nesting aperture, said means consisting solely of cooper
ating parts engaging between them the top and the under
side of the head of the workpiece, and means including
resilient means for producing relative movement be
through and having a sliding fit with the shank of said
tween said cooperating parts parallel to the axis of the
workpieces; drilling means located at one side of said
dial; means for feeding workpieces one at a time to a 65 workpiece to apply yielding gripping pressure to the head
solely in the direction parallel to the axis of the work
loading station located at the back side of the dial; means
piece to hold the latter against turning in the dial, the
for transferring a workpiece vfrom the loading station
clamping `means at one of said stations being operably
longitudinally into a nesting aperture in the dial so that
connected to said head drilling means for cooperative
the shank of the workpiece lies in said aperture and
l
the head thereof projects from the back side of the aper 70 operation therewith.
23. The drilling machine as defined in claim 22,
ture; means for advancing the dial step-by-step to carry
comprising a work-supporting dial having a plurality of
arcuately spaced work-nesting apertures extending there
the workpieces to a work station and means at said work
wherein the head drilling means are advanced and re
tracted relative to the workpiece by power-operated means
including a cam and follower, and in which the clamping
operating parts engaging between them the top and the 75 means operably connected to said head drilling means
station for clamping the workpiece against rotation in
the nesting aperture, said means consisting solely of co
3,030,827
l5
are operated in response to the advancing and retracting
movement of the latter.
24. The drilling machine as defined in claim 23,
wherein an operating slide connects the power-operated
means to said head drilling means and in which the co
operating clamping means are operably connected to said
slide for operation thereby.
25. The drilling machine as defined in claim 24, in
which said cooperating clamping means includes a clamp
ing member having a rod extending therefrom into slid 10
ing engagement with said operating slide and resilient
16
means between said clamping member and said slide for
imparting yielding gripping pressure to said member to
force the Ilatter into engagement with the head of said
workpiece as said head drilling means is advanced.
References Cited in the ñle of this patent
UNITED STATES PATENTS
571,434
Fergusson ___________ __ Nov. 17, 1896
1,902,762
Comlon _____________ .__ Mar. 2l, 1933
2,318,856
2,969,553
Hoffman ____________ __ May 11, 1943
Hatherell et al _________ __ Jan. 31, 1961
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