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Патент USA US2123048

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July 5,' 1938.
SPRING DEVICE FOR DRILLING MACHINES
Filed May 3, 1937
_9 _
11mm:
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2,123,048
A. HOSSFELD
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2 Sheets-Sheet l
July 5, 1938.
‘
HQSSFELD
SPRING DEVICE FOR DRILLING MACHINES
Filed May 3, 1937
2,123,048
_
2 Sheets-‘Sheet 2
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‘ Even/04x"
MMM We?!”
Patented July 5, 1938
6 2,123,048
UNITED STATES PATENT OFFICE
2,123,048
SPRING DEVICE FOR. DRILLING MACHINES
Albert Hossfcld, Winona, Minn.
Application May 3, 1937, Serial No. 140,335
6 Claims. (Cl. 267-1)
My present-invention relates to drilling ma
Figs. 5 and 6 are detail views with some parts
chines of the type disclosed and broadly claimed sectioned on the lines 5-5 and 6—6 of Fig. 4;
in my United States Letters Patent No. 1,888,668
Figs. '7 and 8 are views of the parts shown in
issued of date November 22, 1932. In this type Fig. 5 separated the one from the other;
5 of drillingymachine, the drill is mounted on a
Fig. 9 is a view corresponding to Fig. 4 with
reciprocating carriage for endwise reciprocating the exception that the spring has been contracted
movement that is independent of the reciprocat
su?iciently to permit the removal of the post
ing movement of the carriage. A pair of com
sections and its spring cap from the post; and
pression springs is provided for reciprocating
Fig. 10 is a view corresponding to Fig. 9 with
the exceptionthat the post section and spring 10
10 the drill at a greater speed than that of the
carriage. One of these springs acts as a pro
cap have been removed from the post.
pelling spring for the drill to produce its opera
The drilling machine fragmentarily illustrated
tive stroke and the other of said springs acts as in the drawings is fully shown, described, and
a buffer spring for the drill. The propelling broadly claimed in Patent No. 1,888,668 hereto
spring is placed under tension by the drill dur
fore fully identi?ed.
15
ing its return stroke and drives said drill by its
Of the parts of the drilling machine shown, it
expanding movement at a high velocity during is important to note the drill II, the main frame
its operative stroke. The buffer spring is placed
I2, the carriage I3, the tilting frame I4, the
under tension by the drill during its operative connecting rods I5 for reciprocating the carriage
20 stroke and its expanding movement returns or
I3 on the frame I4, the drill propelling spring 20
retracts the drill at a high velocity. Due to the device I6, the buffer spring I1, and the friction
high velocity at which the drill is operated, the grip I8. The drill I I includes a body I9 in the
lives of ordinary propelling and buffer springs are form of a long round steel rod and a cutter 20
relatively short.
on one end of said body.
The objection to the propelling spring was
overcome by substituting therefor a novel spring
device disclosed and broadly claimed in my
United States Letters Patent No. 1,930,098 of date
on the carriage I3 for compound reciprocatory
and rotary movements.
The tilting frame I4 includes a pair of later
ally spaced guide posts 2| and a pair of cross-tie
plates 22 rigidly secured thereto and held later
ally spaced thereby, the one from the other. A 30
October 10, 1933, and entitled “Spring device for
30 drilling machines”.
It is now the object of this invention to provide ‘
novel means for increasing the life of the buffer
35
This drill I I is mounted
striker plate 23 for the grip I8 rests on the cross
tie plates 22 and is rigidly secured thereto.
spring and facilitate the application thereof to
The carriage I3 includes an upper cross-head
the drilling machine or the removal of the same
24 slidably mounted on the posts 2|, a lower
cross-head 25, and a pair of rods 26 which hold
said lower cross-head suspended from the up
per cross-head 24 between the cross-tie plates 22.
The drill II extends axially through the spring
device I6 and the buffer spring IT, and which
spring device I6, at its outer end, is attached to
a rotatable bearing 21 on the cross-head 24 and
is oscillated during reciprocatory movement of
the carriage I 3 by connectionsZB fromv said bear
ing to the tilting frame I4.
Obviously, the bearing 21, and hence the up
per cross-head 24, affords a base of resistance for
the spring device I6 and the buffer spring I‘!
therefrom.
To the above end, generally stated, the inven
tion consists of the novel devices and combina
tions of devices hereinafter described and de
?ned in the claims.
In the accompanying drawings, which illus
trate the invention, like characters indicate like
parts throughout the several views.
Referring to the drawings:
Fig. 1 is a fragmentary perspective view of .a
45 drilling machine having the invention embodied
therein;
Fig. 2 is a fragmentary detail View partly in
front elevation and partly in central vertical sec
rests on the lower cross-head 25 which affords a
tion;
base of resistance therefor. The friction grip I8
is mounted on the drill body I9 between the ,01 C
Fig. 3 is a view principally in plan showing the
buffer spring device, lower cross-head and its
suspending rods removed from the drilling ma
chine;
Fig. 4 is a View partly in front elevation of
55 the parts shown in Fig. 3;
spring device I6 and
normally rests on said
the drill II therefrom
striker plate 22 and
therewith.
the buffer spring I1, and
buffer spring .and supports
with the grip I8 above the
normally out of contact
55
2
2,123,048
Operation of the drilling machine thus far de
scribed may be briefly described as follows, to
wit:
As the carriage l3 starts its upward travel the
compressed buffer spring I‘! expands against the
grip I 8 and gives the drill H a powerful up
ward throw which causes the same to travel at
36 which extend between the prongs 34. Each
prong 36 has on its lower end a pair of oppositely
projecting lugs 31. It will be noted that the lugs
31 underlie the lugs 35 and are held in engage
ment therewith by the buffer spring I‘! which :1
is held compressed between the lower cross-head
25 and the spring cap 32.
a much faster speed than the speed of the car
By reference to Figs. 5 to 8, inclusive, it will
riage. During this upward travel of the drill II,
the grip l8 engages the spring device 16, com
presses the same under powerful tension and at
which time the spring device l6 absorbs the shock
of the drill H and brings the same to a stop at
the limit of the upward travel of the carriage I3.
Downward movement of the carriage l3 gives
the drill i I a powerful downward throw which is
accelerated by the expansion of the compressed
spring device l6 and causes the drill H to attain
be noted that the post section comprising the
prongs 34 and 38 and the lugs 35 and 31 has the JO
same external diameter as the post 29 and that
a high velocity as it travels to its work.
At or
practically at the end of the downward stroke
of the drill H the grip I8 is brought to a stop
by its engagement with the striker plate 22 and
as the drill H advances into the rock, it drives
itself through the grip 18 by the force of its
the buffer spring H, which encircles the post
29 and the post section 33, holds said section
axially aligned with the post 29. By compressing
the buffer spring ll’ so that its upper end is be
low the post section 33 said section and spring
cap 32 may be removed from the post 29 by a
radial movement thereof relative to the post 29
to separate the prongs 35 from the prongs 34
and the lugs 37 from the lugs 35. After the spring
cap 32 is removed from the post 29 and the ten
sion on the spring l'l released, said spring and
post may readily be removed from the carriage
I3.
As a novel means for compressing the spring ll ‘
9' momentum. The feeding of the drill H through
the grip l8 takes place at a series of almost im
to permit the application of the spring cap 32
perceptible steps of movement. During the op
to the post 29 or the removal of the same there
from, I provide a pair of collars 38 and a pair
erative or downward stroke of the drill II, the
grip l8 engages the buffer spring I1 and places
3O the same under tension.
For the purpose ‘of this case it is not thought
necessary to describe in detail the rotary move
ment imparted to the drill I l except to state that
during the upward travel of the carriage l3 and
while the grip H3 is in engagement with the spring
device l6, said spring device is given a turning
movement by connections 28 which imparts
a like movement to said drill by frictional en
gagement between the spring device l6 and the
40 grip [8.
Referring now in detail to the present inven
tion which includes the buffer spring 11, it has
been found in actual operation of the drilling
machine that when the buffer spring I‘! was al
lowed to exert its full expanding force on the
upwardly moving drill II, that the life of said
spring was comparatively short due to the ?nal
stretching movement thereof during each return
stroke of said drill.
It has also been found that by limiting the ex
panding movement of the buffer spring I‘! that
the life thereof was materially increased. As one
means for limiting the expanding movement of
the buffer spring I1, I provide a tubular post
“3- 29 which extends axially through a central pas
sageway 39 in the lower cross-head 25 with
freedom for endwise sliding movement. This post
29, above the lower cross-head 25, extends ax
ially through the buffer spring I‘! and has on its
lower end an annular shoulder 3| which engages
the under side of said cross-head as a stop that
limits the upward movement of said post through
the cross-head 25. Removably applied to the up
per end of the post 29 is a spring cap 32 which
overlies the upper end of the buffer spring I‘!
and holds the same compressed between said
cap and the cross-head 25.
Formed with the spring’ cap 32 is a depending
post section 33 axially aligned with the post 29
TU and forming an extension thereof. The post 29,
at its upper end portion, is bifurcated to afford
a pair of upstanding prongs 34 each of which
has at its upper end a pair of oppositely pro
jecting lugs 35. The post section 33 is also bi
furcated to afford a pair of depending prongs
of nut-equipped draw-bolts 39. Each collar 38
has an internal recessed annular seat 40 adapt
ed to receive the upper convolution of the spring
ll, outwardly of the spring cap 32, or the stop
flange 3!. On the perimeter of each collar 38
is a pair of diametrically opposite apertured lugs
4| through which the bolts 39 extend.
It will of course be understood that any other
suitable means may be used to compress the
buffer spring H’. To apply the buffer spring de
vice to the lower cross-head 25, the same must
be done before said cross-head is placed in the
drilling machine, or, in case the spring I‘! breaks
or it is necessary to remove the same, the lower
cross-head 25 must be removed from the drill
machine by detaching its suspending rods 26
from the upper cross-head 24.
It may be assumed that it is necessary to re
move the buffer spring device from the lower
cross-head 25, and in which case the spring com
presser 38—39 is applied to said device as shown
in Fig. 4. With the spring compressor thus ap
plied, the nuts on the bolts 39 are turned there
on to draw the upper collar 38 toward the lower
collar 38 and compress the spring I? to a point
in which the top of the upper collar 38 is below
the inner end of the post section 33, see Fig. 9. 55
In this position of the upper collar 38 the post
section 33 may be detached from the post 29 by
a relative radial movement, see Fig. 10. After the
post section 33 is removed from the post 29, the
spring compressor is operated to release the ten
sion on the spring Ill and thereafter removed from
said spring.
From the above description it is evident that
the post 29 and the post section 33 will limit
the expanding movement of the spring I‘! and
at the same time prevent stretching of said
spring during its operative movement to retract
the drill II. At the time the grip l8 strikes
the spring cap 32, during the working stroke of
the drill H which places the spring i'l under 70
tension, the post section 33 will be moved there
by axially relative to the post 29 until the play
between the post section and post has been taken
up and thereafter the engagement of the post
section 33 with the post 29, during further com 75
3
2,123,048
pression of the spring II, will move said post
axially through the aperture 30 in the lower
cross-head 25..
It may be here stated that it is highly im
portant that the top portion of the structure
holding the spring I‘! under compression be very
light in Weight so that when the same is hit by
the grip I8 carried by the drill II, which is mov
ing at a very high velocity, the impact will not
10 be su?icient to break down the structure of the
grip l8, which is preferably made from ?bre.
The aperture in the striker plate 23 is just
large enough to permit the spring IT to work
freely therein and cannot be enlarged for the
15 reason that the surrounding area is necessary
to afford a striking surface for the grip l8. In
view of this structure it will be seen that the
embodiment of the device for holding the spring
I‘! under tension within the external diameter of
20 the spring I1 is necessary.
The invention described has in actual usage
proven that it is possible to easily replace a bioken buffer spring on the job with comparatively
little work and expense.
What I claim is:
25
1. A spring device comprising a post having
at one end a spring base and at its other end
a spring cap, a coupling connecting the spring
cap and post, the coupling comprising separable
30 members, one ?xed to the spring cap and the
2. The structure de?ned in claim 1 in which
the spring normally holds the spring cap against
removal from the post.
3. The structure de?ned in claim 1 in which
the members of the coupling are free to permit
a limited axial movement of the spring cap rel
ative to the post.
4. The structure de?ned in claim 1 in which
the spring is normally held under compression
between the spring base and the spring cap.
10
5. A spring device comprising a post having
at one end a spring base, the other end portion
of the post being bifurcated to afford a pair of
laterally spaced upstanding prongs, a cap hav
ing a pair of depending laterally spaced prongs 15
extending at a right angle to the prongs on the
post, the lateral spacing of one pair of said
prongs being such as to permit the other pair
of prongs to pass therebetween by a lateral move
ment of the spring cap relative to the post, a 20
coiled spring encircling the post and. held be
tween the spring base and the cap, the pairs of
prongs having opposing stop lugs holding the
spring cap against axial separation from the
post, said pairs of prongs and stop lugs being 25
separable by a lateral movement of the spring
cap relative to the post, said spring being ca
pable of compression to a point below the stop
lugs to permit lateral movement of the spring
cap relative to the post and the separation of 30
other to the post, the members of said coupling
being separable only by a lateral movement of
the same therefrom.
6. The structure de?ned in claim 5 in which
the spring cap relative to the post, and a coiled
the stop lugs are at the outer ends of the prongs
and separable to“ permit a limited axial move
ment of the spring cap relative to the post.
spring encircling the post and held between the
35 spring base and the cap, ‘said spring being ca
p-able of compression to a point in which the
spring cap may be removed from the post by a
relative lateral movement.
ALBERT HOSSFELD.
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