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Патент USA US3086239

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April 23, 1963
R. M. STRICKLAND
3,086,229
INTERCONNECTED PIVOTED LATCH MEANS FOR DIE-HEADS
Filed Sept. 12, 1961
2 Sheets-Sheet 1
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INVENTOR
Royce M. STR/C/(L AND
A11: Arron/a vs.
April 23, 1963
R. M. STRICKLAND
3,086,229
INTERCONNECTED PIVOTED LATCH MEANS FOR DIE‘HEADS
Filed Sept. 12, 1961
2 Sheets—~Sheet _2 -
INVENTOR
,
RovcE M- S'TR/c kuwo
51's Arrozzwzys,
United States 'Patent 0
3,036,229
Patented Apr. 23, 1963
2
1
latching position simultaneously. Resilient means, such
‘3,086,229
INTERCONNECTED PIVOTED LATCH MEAN§
FOR DIE-HEADS‘
Royce M. Strickland, New Haven, Conn, assignor to
United-Green?eld Corporation, Chicago, 111., a corpo
ration of Delaware
Filed Sept. 12, 1961, Ser. No. 137,693
7 Claims. (Cl. 10-95)
as springs, urge the stop-levers into latching position.
In order that ‘a clearer understanding of the invention
may be obtained, one practical embodiment thereof is
described hereinafter with reference to the accompanying
drawings showing application of the invention in a die
head of the solid or non-self-opening type.
In the drawings,
FIG. 1 is a central longitudinal vertical section through
The present invention relates to thread-cutting die-he ads, 10 a typical die-head in which the invention may be em
and it relates more particularly to latch means for locking
the thread cutting elements or chasers in a predetermined
ployed;
position.
but showing the adjusting ring rotated 45° in a clock
wise direction from its position in FIG. 1;
It is common practice to provide die-heads with means
FIG. 2 is a section taken on the line 2—2 of FIG. 1,
for latching the chaser operating or closing member in 15
a working position where the chasers are to be ?xed for
cutting the desired threads in a work-piece. Latch means
may ‘also be used to limit the movement of the operating
FIG. 3 is a section taken on the line 3-3 of FIG. 1,
but showing the adjusting ring in the position shown in
FIG. 2;
FIG. 4 is a view similar to FIG.‘ 3, but showing the
stop-levers depressed out of latching position;
member ‘beyond the so-called chaser-retracted position on
FIG. 5 is a front end View partially broken away of
certain types of die-heads where the chasers are posi 20
the die-head shown in FIG. 1;
tioned out of engagement with the work and, in other
FIG. 6 is a detail sectional view taken on the line 6—6
types of die-heads, in the chaser-clearance position where
of FIG. 5; and
the operating member is clear of the chasers so that they
FIG. 7 is a perspective View of the adjusting ring
can be removed and replaced. Upon the release of the
chaser-operating member by disengagement of such latch 25 only.
The particular die-head illustrated by way of example
in the drawings includes a main frame or skeleton, so
their working position will retract outwardly from one
means, the 'chasers, which are spring-loaded away from
position to the next. An example of a die~head of the
self-opening type in which such latch means are employed
called, having a cylindrical head-portion 1t} and a central
latching the operating member in working position and
thread-cutting dies or chasers 18 for threading a work
shank 12 extending rearwardly therefrom. The forward
isshown in the patent to Breitenstein, 1,639,719. In the 30 face of head-portion 10 is formed in this instance with
four radial slots 14 (FIGS. 5 and 6), in each of which is
Breitenstein construction, as in most self-opening die
guided a chaser holder 16. Holders 16 carry individual
heads two separate latch means are provided, one for
piece (not shown). The chaser assembly of the present
theother for latching it in the chaser-retracted position.
Upon release of the operating member from its chaser 35 construction is similar to that shown in the patent to
Breitenstein, 1,756,277, and need not, therefore,.be de~
retracted position, it moves to its chaser-clearance posi
tion. However, in the so-called solid or non-self-opening
type of ‘die-head, the chaser-operating member usually
has only two positions, a working position and a chaser
clearance position. In addition, in most die-heads, whether 40
of the self-opening or solid type, the chasers may be
adjusted for cutting threads of precise diameters.
In die-heads‘ of either the self-opening‘ or solid type
with which the present invention is concerned, the chaser
operating member. consists of a closing sleeve supported
by a frame or skeleton for longitudinal movement there
on. The chasers are mounted in radial tracks ‘at the front
end of the skeleton and are engaged at their outer ends
by a closing sleeve which, when moved forwardly, forces
the chasers inwardly to their working positions and, when
scribed in detail here. It will be understood, of course,
that other types of chasers may be employed if desired.
For example, the chasers may be mounted directly in
slots 14 instead of on holders 16.
.
p
In the construction here illustrated, chaser holders 16
are retained in slots 14 by means of segmental plates
19, which are rigidly secured to the forward face of the
skeleton by screws 29. . Each chaser holder 16 is urged
outwardly toward its retracted position by a spring
plunger assembly 22 (FIG. 6). In addition, each holder
16 is formed at its outer end with ‘a sloping cam-surface
24, which is engaged by asimilarly sloped cam-surface
26 formed on the inner forward corner of a cup-shaped,
moved :rearwardly, permits them to move outwardly to
chaser-operating sleeve 28‘. Sleeve 28 is mounted on the
skeleton for axial sliding movement thereon and bears
their retracted positions. When the closing sleeve is moved
along the inner sides of its forwardly extending walls 30
on the periphery of head-portion it) of the skeleton. Sleeve
su?iciently far to the rear, it clears the outer ends of the
28 is provided at its rear end with ‘an inwardly disposed
chasers so that they can be removed from their tracks
and replaced when in need of sharpening or when a differ 55 annular ?ange ‘32, the inner edge of which bears against
ent thread is required.
.
p The primary object of the present invention is to pro
vide an improved stop-means for latching the operating
the periphery of a cylindrical adjusting ring 34 threadedly
mounted on shank 12 of the skeleton. It will be seen
that axial movement of sleeve 28 forwardly cams chasers
18 into working position, while rearward movement
member in any one of the positions mentioned above de
pending on the particular type of die-head involved. An 60 thereof permits the chasers to retract outwardly. A key
36 (FIG. 5), ?tting a keyway 38 in the inner surface of
other object of the invention is to provide stop-means
wall 30 of sleeve 28, prevents rotation of sleeve 28 with
for the operating member which prevent it from being
respect to head-portion 10‘ of the skeleton.
cocked out of line with the adjacent parts or from bind
In passing, it should be noted that in the particular
ing so that it does not move freely.
In general the invention resides in improved stop-means 65 die-head construction here shown, the walls 30 of operat
ing sleeve 28.,are relatively narrow longitudinally of the
for the operating member comprising two or more stop
of the stop-levers are interconnected so that if one is
skeleton. While certain advantages are attained by em
ploying such a narrow operating sleeve, there is a tend
ency, nevertheless, due to the construction for the sleeve
to tilt more easily when moved axially and therefore to
bind or become jammed while the chasers are being
moved out of latching position, all are pivoted out of
moved int-o the desired working or operating position.
levers, desirably equally spaced about the longitudinal
axis of the skeleton, each stop-lever being pivoted inter
mediate‘ its ends for movement into and out of latching
position with respect to the operating member. The ends 70
3,066,229
35
1i
It is important therefore in moving the operating sleeve
66 are each provided with an enlarged cylindrical head
28 forward to exert pressure symmetrically, i.e. on both
sides, of the rear face of the sleeve in order to prevent
it from binding. As will be brought out hereinafter, the
present invention makes it practical to do this.
Operating sleeve 28 is urged in a rearward direction
portion 72 and 74, respectively, forming annular shoul
ders 76, 73 adjacent the smaller diameter shanks 80‘,
by a pair of spring plungers 46 carried by the cylindrical
head-portion 10 of the skeleton and disposed on dia
81 on which are ?tted helical compression springs 82,
84. The opposite ends of each of passages 68, 70 is
reduced in diameter in order to accommodate and guide
the ‘shanks 80, 81 of plungers 64, 66 and also to form
an internal shoulder within each of passages 68 and 70
metrically opposite sides thereof. Plungers 4d are guided
against which one end of each compression spring 82,
within bores 42 drilled in head-portion 19 parallel to the 10 84 is seated. The opposite end of each compression spring
longitudinal axis of shank 12. Each plunger 46 is pro
engages one of the shoulders 76 or 78‘ on each plunger.
vided with a socket 44, within which is received one end
As ‘shown in FIGS. 3 and 4, the plungers 64 and 66
of a coil spring 46 which urges the plunger rearwardly
are arranged so as to urge stop-levers 50 and 52 in a
against ?ange 32 of operating sleeve 28. The forward
counterclockwise direction toward their latching posi
end of each spring 46 rests against the inner side of one
tions. It will be noted, however, that by pressing inward
of the segmental plates 19 at the front face of the die
ly either on the end 5!)" of stop-lever 50 or on the end
head. It will be noted that each plunger 40 is formed
52" of stop-lever 52, both stop-levers will be pivoted
with a clearance cut 48 at its rear or sleeve-engaging end
simultaneously from their latching positions to their un
in order to avoid engagement with adjusting ring 34 and
latching positions. Since in the present construction the
to permit adequate rearward movement of plungers 40
die-head is designed to have the chasers opened manually,
when operating sleeve 28 is released from the working
?nger-cuts 86, 88 are formed in the rear part of the ad
position in which it is shown in FIG. 1.
justing ring 34- adjacent the latching portions of the stop
The latch-means for the operating sleeve, to which
levers at their ends 50", 52". The ?nger~cuts 86, 88 pro
the present invention is particularly directed, includes
a pair of arcuately shaped stop-levers 50, 52, each piv
oted near its mid-point within similarly shaped slots 54
and 56, respectively, in adjusting ring 34-. As best seen
vide better access to the stop-levers so that one or the
other, or both, can be more readily depressed by hand.
In order to allow the operating sleeve 28 to be moved
from its chaser-opening position, at which point its ?ange
in FIG. 7 slots 54 and 56 are formed on opposite sides
32 is adjacent ?ange 63 on adjusting ring 34, it is neces
of adjusting ring 34 in a plane perpendicular to the longi
sary to depress stop-levers 50, 52 which, of course, snap
tudinal axis thereof. Pivot pins 58 for the stop-levers 30 outwardly when ?ange 32 passes to the rear of adjust
59, 52 are located diametrically opposite each other such
ing ring 34'. To this end, the outer rear edge of each of
that they pass through the central portions of slots 54
the wedge-shaped latching portions of stop-levers 50 and
and 56 and are held ?rmly at their ends in passages 59
52 is bevelled as shown at 90 and 92, respectively, in FIG.
drilled longitudinally in adjusting ring 34, into which
1. In addition, the forward corner of ?ange 32 is also
they are press ?t.
Slots 54 and 56 are cut transversely
bevelled so that as sleeve 28 is slid forward it will engage
through adjusting ring 34 to a suitable depth in order to
the bevelled surfaces of stop-levers 50, 52 and will de
press them until the ?ange 32 passes in front of them.
Adjusting ring 34 is provided in the usual manner with
leave oppositely disposed connecting portions 60, 62 in
the annular wall of adjusting ring 34. The ends of arcu
ate slots 54, 56 are de?ned by parallel chords disposed
perpendicular to a diameter of the adjusting ring through
a tool socket 94 to receive a suitable tool for turning it
As best seen in FIG. 4, the outside diameter of stop
levers 50, 52 is approximately equal to the CD. of ad
justing ring 34 so that they can be pivoted to a position
on shank 12 in adjusting the chasers to the desired
thread size. A set-screw 96 is also provided for locking
the adjusting ring in place once the desired adjustment
has been made.
Since the stop-levers in the present construction en
wholly within the periphery of the adjusting ring. In
gage the operating sleeve at diametrically opposite points,
order to provide room within slots 54, 56 for stop-levers
50, 52 to move between their latching positions shown in
FIG. 3 and unlatching positions shown in FIG. 4, one
end 50', 52' of each stop-lever is made slightly shorter
than the other. In the latching position of FIG. 3, a
wedge-shaped segment on each of the opposite ends 50",
52” of stop-levers 5t}, 52 projects outwardly of the pe
ripheral surface of adjusting ring 34 so that, as shown
in FIG. 1, they engage the rear side of ?ange 32 of the
the operating sleeve is not tilted or cocked as it is being
pivot pins 58.
adjusted longitudinally of shank 12 by means of adjust
ing ring 34. In order to ensure this, however, it is of
course important that the two stop-lever slots 54 and 56
operating sleeve 28, holding this member in its forward
in the adjusting ring be accurately in line. While the
same advantage could be obtained by using independently
movable stop-levers located on opposite sides of the ad
justing ring, this is not satisfactory because it is di?icult
to depress both levers simultaneously in order to release
the operating sleeve. The present invention, however, has
or chaser-closing position. When stop-levers 5t), 52 are
pivoted clockwise, as viewed in FIGS. 2-4, to the un
latching position of FIG. 4, the ends 56'', 52" are re
even ‘more, stop-levers practical.
What is claimed is:
tracted within the periphery of adjusting ring 34 permit
ting operating sleeve 28 to slide rearwardly to its chaser
opening position. An outwardly directed ?ange 63 at
‘solved this problem well and renders the use of two, or
1. In a die-head comprising a skeleton or frame having
an elongated shank, a plurality of chasers mounted on
said skeleton for reciprocal movement radially of the
longitudinal axis of said shank into and out of work
engaging position, an operating member supported on
said skeleton for movement longitudinally of said shank
the rear end of adjusting ring 34 limits the rearward
travel of operating sleeve 28 at a position in which the
walls 30 thereof clear the chaser holders 16 so that they
may be removed from the radial guide slots 14 for re 65 in one direction in order "to move said chasers into work
placement.
engaging position and in the other direction for retracting
The adjacent ends 56' and 52" as a pair, as well as
ends 50" and 52’ as a second pair, of stop-levers 50 and
said chasers, and stop-means positioned on said shank for
limiting the movement of said operating member in said
52 are interconnected by means of identical plungers 64
other direction; the improvement in which said stop
and 66, which are guided within passages 68 and 70, re 70 means comprises in combination a plurality of stop-levers
spectively, through the connecting portions 60 and 62 of
each pivoted intermediate its extremities for movement
adjusting ring 34. Plungers 64, 66 are in substantially
into and out of latching position with respect to said op
continuous engagement with the opposite ends of stop
erating member, means interconnecting adjacent ends
levers 5t), 52 so that any pivotal movement of one causes
of said stop-levers such that each of said stop-levers is
a corresponding movement of the other. Plungers 64,
pivoted out of latching position upon pivotal movement
3,086,229
6
of any one of said stop-levers out of latching position, i
and resilient means urging said stop-levers into latching
position.
2. The combination de?ned in claim 1, wherein said
stop-means comprises a pair of said stop-levers disposed
diametrically opposite each other on either side of said
.
ing said chasers, and stop-means positioned on said shan
for limiting the movement of said operating member in
said other direction; the improvement in which said stop
means comprises in combination a pair of stopslevers
disposed opposite each other on either side of said shank,
each stop-lever being pivoted intermediate its extremities
for movement into and out of latching position with re
spect to said operating member, means interconnecting
a plane normal to the longitudinal axis of said shank.
adjacent ends of said stop-levers comprising a ?rst spring
3. ‘In ‘a die-head comprising a skeleton or frame hav
ing an elongated shankpa plurality of chasers mounted 10 loaded plunger having one end urging a ?rst of said stop
levers in one direction about its pivot point and the other
on said skeleton for reciprocal movement radially of the
end disposed for engagement with the second of said
longitudinal axis of said shank into and out of work
stop-levers, a second spring-loaded plunger disposed be
engaging position, an operating member supported on said
tween the opposite ends of said stop-levers and urging
skeleton ‘for movement longitudinally of said shank in
one direction in order to move said chasers into work 15 said second stop-lever into engagement with said ?rst
plunger.
engaging position and in the other direction for retract
5. ‘The combination de?ned in claim 4, wherein said
ing said chasers, and stop-means positioned on said shank
stop-levers are identical and said spring-loaded plungers
for limiting the movement of said operating member in
‘are likewise identical.
said other direction; the improvement in which said stop
6. The combination de?ned in claim 4, wherein each
means comprises in combination a pair of stop-levers 20
of said spring-loaded plungers includes a compression
disposed opposite each other on either side of said
spring urging one end of the plunger associated therewith
shank, each stop-lever being pivoted intermediate its
extremities for movement into and out of latching posi
against one of said stop~levers, the other end of each of
tion with respect to said operating member, a pair of
said plungers extending in the opposite direction into
‘plungers interconnecting adjacent ends of said stop-levers 25 engagement with the other stop-lever.
such that each of said stop-levers is pivoted out of latch- '
7. The combination de?ned in claim 4, wherein said
ing position upon pivotal movement or any one of said
stop-means is disposed in and supported by an adjusting
stop-levers out of ‘latching position, and resilient means
ring threaded on the shank of said skeleton tor adjust
shank, the pivotal movement of said stop-levers being in
urging said stop-levers into latching position.
4. In a die-head comprising a skeleton or ‘frame hav
ing an elongated shank, a plurality of chasers mounted
on said skeleton for reciprocal movement radially of the
longitudinal axis of said shank into and out of work
engaging position, an operating member supported on
said skeleton for movement longitudinally of said shank 35
in one direction in order to move said chasers into work
engaging position and in the other direction for retract
ably positioning said stop-levers longitudinally ofsaid
shank.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,683,126
1,753,819‘
.Breitens-tein ____‘_g ____ __ Sept. 4, 1928
Breitenstein ___________ .._ Apr. 8, 1930
2,958,877
Strickland ___________ __ Nov. 8, 1960
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