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Патент USA US2130119

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Sept. 13, 1938.
A. E. DRISSNER
2,130,119
POSITIVE ACTING CIRCULAR CHASER DIE
Filed May 22, 1937
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Sept. 13, 1938.
A. E. DRISSN ER
2,130,119
POSITIVE ACTING CIRCULAR CHASER DIE
Filed May 22, 1957
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4 Sheets-S?eet 2
Sept. 13, 1938.
A. E. DRISSNER
2,130,119
POSITIVE ACTING CIRCULAR CHASER DIE
Filed May 22, 1957
4 Sheets-Sheet 3
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Sept. 13, 1938'.
A. E. DRISSNER
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POSITIVE ACTING CIRCULAR CHASER DIE
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Filed May 22, 1957
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2,130,119;
Patented Sept. 13, 1938
omen stares
ATENT orFmE
2,130,119
POSITIVE ACTING CIRCULAR CHASER DIE.
Alfred E. Drissner, Cleveland, Ohio, assignor to
The National Acme Company, Cleveland, Ohio,
a corporation of Ohio
Application May 22, 1937, Serial No. 144,228
20 Claims. (01. 10—96)
This invention relates to threading dies for use
on automatic screw machines, the object of the
invention being to provide an improved positive
acting die in which the cutters or chasers are
5 _. positively expanded or retracted in an ei?cient
manner and which die is simple in construction
and operation.
In the drawings accompanying and forming a
part of this specification, Fig. 1 is a side View of
10 ‘ this improved die.
Fig. 2 is a front end View thereof.
Fig. 3 is a longitudinal sectional view.
7
Fig. 4 is a section on line 4—% of Fig. 3, look
ing in the direction of the arrows.
15;; Fig. 5 is a perspective View of the cam holder
'
with‘the cams removed.
.
Fig. 6 is a perspective view of one of the cams
for use in the cam holder of Fig. 5.
Fig. 7 is a sectional view on line 'l—‘! of Fig. 1,
cesses of an annular cam holder or carrier I3
located on the inner end of the shank ‘l and
within the hood 8. These cams are in position to
be operated by the cam Ill as the hood is shifted
back and forth and are held in projected posi
tion by suitable springs I4 (see Fig. 4) located in
opposed faces of the cams and cam holder and
in their projected position they engage the rear 10
face of an annular sliding ring l5 carried on the
cam holder l3 and in juxtaposition to the rear
face of the head 3. This ring l5, upon the de
pression of the cams II, will be shifted rear
wardly on the cam holder l3 by suitable springs
20 located in opposed faces of the ring l5 and die
head 3.
-
This sliding ring I5 carries a series of longi
tudinally extending cam studs 16 secured to the
ring by pins l6’ and adapted to project through
20 looking in the direction of the arrows.
Fig. 8 is a longitudinal section on line 8-—8 of
Fig. 7, looking in the direction of the arrows.
Fig. 9 is a detail perspective view of the sev
eral parts of the die disassembled, and
25,
having inclined cam faces l2 (see Fig. 6). These
cams II are carried in opposed segmental re
Fig. 10 is a perspective view of a chaser block
’ showing in dotted lines a circular chaser applied
thereto.
Similar characters of reference indicate corre
sponding parts in the several views.
Before explaining in detail the present im
30
‘provement and mode of operation‘thereof, I de
sire to have it understood that the invention is
suitable openings IT in the head 3 and provided
with tapered cams or keys [8 (see Fig. 9). Each
of these keys l8 engages a similarly formed cam
slot H9 in a chaser block 5 adapted to slide in the
radial slot 4 of the head 3.
Threaded on the shank ‘l is a collar 24 in posi
tion to engage the rear face of the cam holder l3
2.5
and hold the parts properly assembled and also
effective to adjust the position of the cam holder
!3. Adjustment of this collar 24 in either di 30
rection effects a like movement of this cam holder
l3, cams ll , ring I5, studs l6 and thereby, through
not limited to the details of construction and ar
. the cams or keys l8, shifts the chaser blocks and
rangement of parts illustrated in the accompany
their chasers inwardly or outwardly radially. By
' adjustment of this collar toward the chasers, the
35 . ing drawings since the invention is capable of
other embodiments, and- that the phraseology chasers are adjusted to cut a smaller diameter of
40
work.
Suitable springs I3’ co-operate with the
employed is for the purpose of description and
not of limitation.
In the preferred form, this improved die com
prises a die body 2 having an enlarged head 3
cam holder l3 and rear face of the die body for
holding the cam holder in engagement with the
having radially extending slots A of T-shape
A retaining block 25 having an elongated slot
therein for the reception of similarly formed
chaser blocks 5 adapted to carry chasers 6 which
of a screw and limits the backward movement
are shown herein as of circular form.
The die
45 :body has an extended bored shank ‘l for attach
'ment to suitable holding means of a screw ma
chine, whereby the die is rotated.
Slidably carried on the body 2 is a hood 8 hav
ing an annular recess 9 in the periphery thereof
50 . for the reception of a yoke, not shown, carried by
‘the machine whereby the hood is shifted back
and forth. Within this hood 8 is an inwardly
projecting annular cam I9 in position to co
operate with a pair of oppositely located seg
55‘. mentally formed shiftable cams l I (see Fig. 4)
collar 24.
'
40
26 is suitably secured on this collar 24 by means
of the ring i5 and its associated parts and pre
vents the keys l8 from riding beyond the slots 59
in the chaser blocks 5 and thus also prevents the
blocks from falling out of the die.
This retain
ing block 25 may be moved backward to permit
the cams E8 to disengage the slots IQ of the blocks
5 when it is desired to remove the blocks for the 50
insertion of new or reground chasers.
Suitably removably secured within the body 2
as by a bayonet joint 21 and projecting between
the chasers is a work guide member 28 having
projecting tines 29 extending between the chasers, 55
2
2,130,119
to prevent the work falling between the chasers
when the die is in open position.
To insure the positive action of this die, elon
gated slots 2| (see Fig. 3) are provided in the
locking means by depression thereof, and means
for adjusting the position of the locking means
and thereby the diameter of the chasers.
4. A threading die comprising a body, a plu
hood 8 and through these slots suitable screws 22
rality of radially shiftable chasers and a cam
project into the ring I5. When the hood 8 con
tacts these screws 22, the expanding action of
the chasers is started if for any reason the springs
20 fail to do this Work. After the expanding
action of the chasers is started, the springs will
complete the expanding action as before de
scribed.
'
The operation of the die is as follows:
Just before the completion of the threading
15 operation, the yoke carried by the machine and
engaging the hood 8 in the annular recess 9 holds
back the hood as the other parts of the die con
tinue their forward travel. The annular cam
III on the inside of the hood rides up the inclined‘
20 surface I2 of the cams I I thereby depressing them
within the cam holder I3 against the action of
the springs I4. As these cams are pressed within
the periphery of the holder I3, the locking action
of the cams against the rear face of the ring I5‘
is released and the springs 20 acting against the
die head 3 force the ring I5 to the ear and with
member, means for locking said member and com—
prising a shiftable cam, both of said means car
ried by the cam carrier, a shiftable hood for con 10
trolling the operation of and directly engaging
said locking means and effective to release the
locking means by depression thereof, and means
for adjusting the position of the locking means
and thereby the diameter of the chasers.
15
5. A threading die comprising a body, a plu
rality of radially shiftable chasers and a cam car
rier carried thereby, positive acting means for
shifting the chasers and comprising a sliding
ring, said cam carrier projecting into said ring 20
and provided with shiftable cams for locking the
ring, and a hood having a cam directly engag
ing said shiftable cams for controlling said cams
whereby on the depression thereof said ring will
be released to permit sliding thereof.
25
6. A threading die comprising a body, a plu
it the cam rods I6 and due to the sliding ‘action
rality of radially shiftable chasers and a cam car
of the keys I8 in slots I9 of the blocks 5', the
rier carried thereby, positive acting means for
shifting the chasers and comprising a sliding
ring, said cam carrier projecting into said ring and‘
provided with shiftable cams for locking the ring,
chasers are released form the work.
30
carrier carried thereby, positive acting means for
shifting the chasers and comprising a sliding
To reset the die, the spindle is moved back
ward until the yoke engaging in the groove 9 of
the hood 8 is stopped. The body of the die con
tinues to move back until the flanged face 23‘ of
the hood contacts the rear face of the ring I5
‘ thus holding this ring stationary and permitting
the cams II to expand or project outward by
a hood having a cam directly engaging said shift~
able cams for controlling said cams whereby on
the depression thereof said ring will be released
to permit sliding thereof, and means for adjust
ing said cam carrier for controlling the diameter
of the chasers.
7. A threading die comprising a body, a plu
means of the springs I4, thus locking the ring I5
in place.
It is to be understood that, by describing in
rality of radially shiftable chaser carrying blocks
40 detail herein any particular form, structure or
carried thereby and having inclined slots, a cam
carrier encircling said body, positive acting means
for shifting the blocks and comprising a sliding
ring having forwardly projecting cam formed
or the requirements of the prior art.
‘
Having thus explained the nature of my said‘ studs co-operating with the slots of the chaser
blocks, said cam carrier projecting into said ring
45 invention and described a way of constructing
and using the same, although without attempting and provided with radially shiftable cams for
to set forth all of the forms in which itmay be locking the ring, and a shiftable hood having a
cam directly engaging said shiftable cams for
made, or all of the modes of its use, I claim:
controlling the operation of said cams whereby
1. A threading die comprising a body, a. plu
on the depression thereof said ring will be released
50 rality of radially shiftable chasers and a carrier
to permit sliding thereof.
carried thereby, positive acting means for shift
8.- A threading die comprising a body, a plu
ing the chasers and comprising a sliding member,
means for locking said member, both of said rality of radially shiftable chaser carrying blocks
means carried by the carrier, and a shiftable hood carried thereby and having inclined slots, a cam
carrier encircling said body, positive acting means
for controlling the operation of and directly en
gaging said locking means and effective to release for shifting the blocks and comprising a sliding
ring having forwardly projecting cam formed studs
the locking means by depression thereof.
2. A threading die comprising a body, a plu
co-operating with the slots of the chaser blocks,
said cam carrier projecting into said ring and
rality of radially shiftable chasers and a cam car
rier carried thereby, positive acting means for provided with radially shiftable cams for locking
shifting the chasers and comprising a sliding the ring, a shiftable hood having a cam directly
engaging said shiftable cams for controlling the
member, means for locking said member and com
operation‘of said cams whereby on the depression
prising a shiftable cam, both of said means car
ried by the cam carrier, and a shiftable hood for thereof said ring will be released to permit sliding
thereof, and means for adjusting the cam car
' controlling the operation of and directly engag
ing said locking means and effective to release the rier thereby to adjust the diameter of the chasers
locking means by depression thereof.
carried by the blocks.
9. A threading die comprising a body, a plu
3. A threading die comprising a body, a plu
rality of radially shiftable chasers and a carrier rality of radially shiftable chaser carrying blocks
carried thereby and having inclined slots, a cam 70
70 carried thereby, positive acting means for shift
ing the chasers and comprising a sliding member, carrier encircling said body, positive acting means
means for locking said member, both of said for shifting theblocks and comprising a sliding
means carried by the carrier, a shiftable hood for ring having forwardly projecting cam formed
controlling the operation of and directly engag
studs co-operating with-the slots of the chaser
75,. ing said locking means and effective to release the blocks, resilient means co-operating with the body n l
arrangement, it is not intended to limit the in
vention beyond the terms of the several claim
3
2,130,119
and ring for shifting the ring rearwardly, said
cam carrier projecting into said ring and pro
vided with radially shiftable spring actuated
cams for locking the ring, and a shiftable hood
having a cam directly engaging said shiftable
cams for controlling the operation of said cams
whereby on the depression thereof said ring will
be released to permit sliding thereof.
10. A threading die comprising a body, a. plu
10 rality of radially shiftable chaser carrying blocks
carried thereby and having inclined slots, a cam
carrier encircling said body, positive acting means
for shifting the blocks and comprising a sliding
15'
ring having forwardly projecting cam formed
studs co-operating with the slots of the chaser
blocks, said cam carrier projecting into said ring
and provided with radially shiftable cams for
locking the ring, a shiftable hood having a cam
directly engaging said shiftable cams for con
20; trolling the operation of said cams whereby on
the depression thereof said ring will be released to
permit sliding thereof, and means co-operating
with the ring and the hood for shifting the ring
in one direction on the movement of the hood.
25
11. A threading die comprising a body, a plu
rality of radially shiftable chaser carrying blocks
carried thereby and having inclined slots, a cam
carrier encircling said body, positive acting means
for shifting the blocks and comprising a sliding
30 ring having forwardly projecting cam formed
studs co-operating with the slots of the chaser
blocks, said cam carrier projecting into said ring
and provided with radially shiftable cams for
locking the ring, a shiftable hood having a cam
35 directly engaging said shiftable cams for con
trolling the operation of said cams, resilient
means co-operating with the body and the ring
for shifting the ring upon depression of said
cams, and means co-operating with the ring and
hood for insuring the shifting movement of the
ring in one direction.
12. A threading die comprising a body, a plu
rality of radially shiftable chaser carrying blocks
carried thereby and having inclined slots, positive
45 acting means for shifting the blocks and compris
ing a sliding ring having forwardly projecting cam
formed studs co-operating with the slots of the
chaser blocks, resilient means co-operating with
the body and ring for shifting the ring, an annu
lar cam carrier carried by the body and projecting
50
into said ring and provided with radially shiftable
spring actuated cams for locking the ring, a
shiftable hood having a cam directly engaging
said shiftable cams. for controlling the operation
55 of said cams, whereby on the depression of said
spring actuated cams said sliding ring will be re
leased, means co-operating with the ring and hood
for insuring the shifting of the ring in one direc
tion on the movement of the hood, and an ad
60 justable collar co-operating with the cam carrier
for adjusting the position of the chaser blocks
and thereby the chasers.
13. A threading die comprising a body having
a shank, a plurality of radially shiftable chaser
65 carrying blocks carried by the body and having
inclined slots, positive acting means for shifting
the blocks and comprising a sliding ring having
forwardly projecting cam formed studs project
ing through the body and co-operating with the
70 slots of the chaser blocks, an annular cam carrier
carried by the shank and projecting into the ring
and provided with radially shiftable cams for
locking the ring, and a shiftable hood having an
inwardly extending cam directly engaging said
75 shiftable cams for controlling the operation of
said shiftable cams whereby on the depression
thereof said ring will be released thereby to per
mitsliding of said ring.
14. A threading die comprising a body having
a shank, a plurality of radially shiftable chaser
carrying blocks carried by the body and having
inclined slots, positive acting means for shift
ing the blocks and comprising a sliding ring hav
ing forwardly projecting cam formed studs‘ pro
jecting through the body and co-operating with 10'l
the slots of the chaser blocks, an annular cam
carrier carried by the shank and projecting into
the ring and provided with radially shiftable cams
for locking the ring, a shiftable hood having an
inwardly extending cam directly engaging said I57
shiftable cams for controlling the operation of
said shiftable cams whereby on the depression
thereof said ring will be released thereby to per
mit sliding of said ring, and an adjustable col
lar carried by the shank and in engagement with 20'
the cam carrier for adjusting the position there
of and thereby the diameter of the chasers.
15. A threading die comprising a body, a plu
rality of radially shiftable chasers and a car
rier carried thereby, positive acting means for 25
shifting the chasers and comprising a sliding
member, means for locking said member, both
of said means carried by the carrier, a shiftable
hood for controlling the operation of and direct
ly engaging said locking means and eiiective to 30
release the locking means by depression thereof,
and work guiding means carried by the body and
projecting between the chasers, to prevent the
work falling between the chasers when the die
is open.
35
>
16. A threading die comprising a body, a plu
rality of radially shiftable chasers and a car
rier carried thereby, positive acting means for
shifting the chasers and comprising a sliding
member, means for locking said member, both 40
of said means: carried by the carrier, and a shift
able hood for controlling the operation of and
directly engaging said locking means and effec
tive to release the locking means by depression
thereof, and a detachable work guiding means 45
carried by the body.
.
17. A threading die comprising a body, a plu
rality of radially shiftable chaser carrying blocks
carried thereby and having inclined slots, posi
tive acting means for shifting the blocks and 50
comprising a sliding ring having forwardly pro
jecting cam- formed studs co-operating with the
slots of the chase-r blocks, a cam carrier en
circling the body and projecting into said ring
and provided with radially shiftable cams for 55
locking the ring, a shiftable hood having a cam
directly engaging said shiftable cams for con
trolling the operation of said cams whereby on
the depression thereof said ring will be released
thereby to permit sliding of said ring, and a de 60
tachable work guiding means carried by the body.
18. A threading die comprising a body having
a shank, a plurality of radially shiftable chaser
carrying blocks carried by the body and having
inclined slots, positive acting means for shift 65
ing the blocks and comprising a sliding ring
having forwardly projecting cam formed studs
projecting through the body and co-operating
with the slots of the chaser blocks, an annular
cam carrier carried by the shank and project 70
ing .into the ring and provided with radially
shiftable cams for locking the ring, a shiftable
hood having an inwardly extending cam directly
engaging said shiftable cams for controlling the
operation of said shiftable cams whereby on the 75
4
2,130,119
depression thereof said ring will be released there
by- to permit sliding of said ring, and a detachable
work guiding means carried by, the body.’
19. A threading die comprising a body, a plu
rality of radially shiftable chaser carrying blocks
carried by the body and having wing extensions
adapted to engage the face of the body, a car
rier encircling said body, positive acting means
for shifting the chasers and comprising a slid
ing member, means for locking said member,
both of said means carried by the carrier, and a
shiftable hood for controlling the operation of
and directly engaging said locking means and
effective to release the locking means by depres
16; sions thereof.
20. A threading die comprising a body having
a shank, a plurality of radially shiftable chaser
carrying blocks carried by the body and having
wing extensions adapted to engage the front
20: face of the body and also having inclined slots,
positive acting means for shifting the blocks and
comprising a ‘sliding ring having forwardly pro
jecting cam for-med studs. co-operating with the
slots‘ of, the, chaser blocks, resilient means co
operating with the body and ring for shifting the 5
ring rearwardly, an annular cam carrier mounted
on theshank and projecting into said ring and
provided with radially shiftable spring actuated
cams for locking the ring, springs co-operating
with, the body and cam carrier, a shiftable hood 10
having a,‘ cam directly engaging said shiftable
cams: and effective to depress the cams of the
cam carrier and thereby release the stud carry
ing ring thereby to shift the chasers, and an ad
justable collar carried by the shank and co 15
operating with the cam carrier to adjust the
position thereof and thereby adjust the position
of the chasers.
ALFRED E. DRISSNER.
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