Improvements in Lathes for Making Screws and other Small Articles.
Year: 1897

page_text: Date of Application, 31st Aug., 1897-Accepted, 26th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in Lathes for Making Screws and other Small Articles.
I, GEORGE EVERETT WITHERELL, of 127, Oak Street, Hartford, County of Hart-
ford and State of Connecticut, United States of America, Mechanical Engineer,
do hereby declare the nature of this invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement: -
My invention relates to the class of machines used in making screws or other
small articles that are required to be turned or otherwise formed to shape, these
being cut from a rod of stock and submitted to different automatic operations of
the machine until completed, the tools for performing these operations being
moved up to and away from the work. The object of my invention is to provide
in a machine of this class means for economically producing a high grade of work
in the least possible time and for enclosing certain parts of the machine in such
manner that they may be readily uncovered when required, and also provide a
turret that shall be positively and firmly clamped during the operations of the
tools carried thereby. To this end my invention consists in the details of the
several parts making up the machine as a whole and in their combination as
hereinafter described and pointed out in the claims.
Referring to the drawings:-
-
Figure 1 is a view in front elevation of a machine embodying my invention.
Figure 2 is a detail view in rear elevation on enlarged scale showing a portion
of the frame and the tool holding turret with parts broken away to show con-
struction.
Figure 3 is a detail view in vertical central section through the turret and
adjacent parts.
Figure 4 is a detail top view of the turret and adjacent parts.
Figure 5 is a front view of one-half of one of the lever enclosing cases.
Figure 6 is a detail side view showing the locking means.
Figure 7 is a detail top view of one of the sections.
Figure 8 is a detail view in end elevation of a portion of the machine illustrating
the turret locking mechanism.
Figure 9 is a detail top view of the turret showing the locking mechanism.
Figure 10 is a detail bottom view of the same.
Figure 11 is a detail view in section through the clamping ring and clamping
ring cover showing the locking wedges.
Figure 12 is a detail view in elevation showing the mechanism for operating
the clamping ring and index bolts.
Figure 13 is a detail view in central section through the tool holding arm.
Figure 14 is a detail view in central section through the speed changing
mechanism.
Figure 15 is a detail view showing a portion of the plunger for operating the
index bolt.
Figure 16 is a detail view looking from the rear of the locking lever bracket
and showing the stop and pin on the rotary head.

page_text: Figure 17 is a detail bottom view of the cover plate.
Figure 18 is a detail top view of the clamping ring.
Figure 19 is a detail perspective view of the clamping ring.
Figure 20 is a detail top view of the ratchet bolt.
Figure 21 is a detail view in section of a portion of the machine showing the
ratchet bolt in side elevation.
In the accompanying drawings the numeral, 1, indicates the frame of the
machine made of any ordinary material as iron, 2, denotes the driving shaft mounted
in bearings and extending across one end of the machine and bearing a pulley, 3,
by means of which it may be driven from any suitable source of power. This
driving shaft has a worm in mesh with a worm wheel, 4, secured to the cam
shaft, 5, extending lengthwise of the machine and bearing cams for performing
the various operations for which the machine is intended.
A reverse motion is mounted in standards, 6, on the machine and has the pulleys, 7,
for imparting motion to it, a lever, 8, and cam, 9, being employed to operate this
reverse motion. A feeding mechanism, 10, and a chucking mechanism, 11, are
located back of the reverse motion, the rod of stock from which articles are to be
manufactured extending through these devices, and carriages, 12 and 13, recipro-
cated by the cam wheel, 14, being employed to operate the feeding and chucking
mechanisms respectively.
f
A sliding tool carriage, 15, is mounted on the frame of the machine and is
reciprocated by the levers, 16, in engagement with the cam, 17, on the cam
shaft, 5.
All of the mechanism above described is old and forms no part of the present
invention, and a further description thereof is deemed unnecessary herein, this
mechanism being chosen for the purpose of properly illustrating the operation of
the mechanism forming the subject matter of the within invention.
A slide-way is formed in the upper part of the frame of the machine near one
end in which is located a ratchet bolt, 18, which has a sliding movement therein.
This bolt has a lateral enlargement on one end closely fitting (so as to slide easily
therein) a ratchet bolt socket 19 made depthwise through the frame. A ratchet
bolt pin 20 is secured within a hole in the enlargement on this ratchet bolt, the
upper end of the pin engaging the teeth of a ratchet 21 secured to the hub of a
turret 22. This ratchet bolt is held normally in the path of movement of the
ratchet by any suitable mechanism as by means of a ratchet bolt spring thrusting
with one end against a shoulder on the ratchet bolt and with the other end against
the outer wall of the slide way in the side part of the frame of the machine.
The turret 22 is secured to a turret slide 23 that has a reciprocating movement
lengthwise of the frame in the turret slide way 24, through the medium of the
main cam 25 secured to the cam shaft 5 that engages a main cam stud 26 secured
to the turret slide 23.
The turret 22 is borne in an angular socket in the upper part of the turret
slide, the hub 29 of the turret extending through the turret slide, a bushing 30
being secured on this hub. A ratchet pin 31 extends through a central opening
in the turret, the ratchet 21 being secured on the lower threaded end of this
ratchet pin, and a projection on the upper side of the ratchet wheel engages a
diametrical slot in the lower end of the hub of the turret. By the engagement of
this projection in the slot the turret is caused to revolve with the ratchet.
boss 33, preferably round, located centrally on the ratchet engages a similar shaped
opening in the center of the bottom of the turret for the purpose of centering
the parts.
.
A
A die closing spindle 34 extends through a central opening in the ratchet pin 31,
a die closing cam 35 being secured to the upper end of the spindle, the screw
threaded lower end of which engages with a screw threaded opening in a die
closing plate 36.
The plunger 110, located in the shank of a "threading tool," is reciprocated
to close or release the dies thereof. This "threading tool" is a device provided
H

page_text: with screw-cutting dies made up of parts brought to their operative position by
reciprocating cam surfaces impelled past their exterior extremities and disengaged
by the action of springs after the return of the cam surfaces. Such tool forming
no part of the present invention need not be further described. To cause the
reciprocating movement of this plunger in one direction. the cam 35 is held
against rotation on the die closing spindle 34, this spindle being held against
rotation in a die closing plate 36 which is secured to the under surface of the
turret slide, this plate 36 bridging the recess containing the ratchet 21; allowing
it to freely rotate underneath the plate. As the turret 22 is revolved this
plunger 110 is carried past the cam, pushing the plunger forward, to adjust the
sectional dies of the "threading_tool" to their proper diameter, previous to the
turret being revolved to the proper position to bring such dies into engagement
with the work when the turret slide is carried forward by the main cam 25. As
the work passes into the dies, the end thereof encounters the plunger and pushes
it backward, freeing the dies, which are thereupon brought out of engagement
with the work, allowing the carriage to be moved back.
An index ring 37 is secured to the underside of the turret, a flange 38 on the
turret extending through a central opening in the index ring. An index bolt 39
is located in an index bolt socket 40 in a lateral projection 41 from the turret
slide and is adapted to engage the bolt sockets 42 in the edge of the index ring 37.
An index bolt stud 44 projects downward from the under side of the index bolt
through a slot in the bottom wall of the index bolt socket.
A cam latch 76 is pivoted on the frame of the machine and has an upward
protecting cam 77 located in the path of movement of the index bolt stud, a
suitable spring or like means being employed to exert pressure on the latch
toward the turret slide. An index bolt spring is located in a socket in the index
bolt with its outer end thrusting against a wall of the socket and its inner end
against the bolt tending normally to thrust the latter inward.
A cam ring 45 rests on an annular shoulder 53 on the lower part of the turret
and has a rotary movement thereon. A cam projection 46 extends outward from
one side of the cam ring and has a cam slot 47 therein. In the upper surface of
the ring are formed cam sockets 48 in which are firmly secured cams 49.
A cover plate 50 has a downward projecting annular flange 54 resting on the
turret slide, screws or other suitable means for securing the cover to the turret
slide passing downward through the former and through this flange. This flange
completely closes the outer edge of the cam ring, the latter, however, being loose
enough therein to turn freely. In the under surface of the cover plate are formed
cam sockets 51 in proper position to register with the cam sockets 48 in the cam
ring, cams 52 being located in these sockets. The cams 49 and 52 are beveled
in opposite direction, and the latter are backed up by cam screws 55 extending
through the cover plate and providing an adjustment for the cams. By this
construction as the cam ring is turned in the proper direction the opposing faces
of the bevel cams are brought together and the cam ring 45 forced down onto
the annular shoulder 53 on the turret, holding the latter firmly in place.
It will be noted from this construction that the turret has an extremely wide
bearing portion in its socket in the turret slide, and when the turret has been
rotated to a position for the operation of any of the tools borne therein the clamp-
ing ring serves to hold it firmly in this position, if for any reason, as by neglect
or carelessness of the operative, any of the screws for taking up wear should have
been permitted to become loose. This ensures at all times the stability of the
turret during the operation of the tools and the production of accurate work.
A clamping bolt socket 59 is formed by a shouldered recess in the lateral pro-
jection 41 on the turret slide, this clamping bolt socket being located just above
the index bolt socket, the latter being of a sufficient depth to perimit of a free
movement of the index bolt underneath the clamping bolt 56, the two resting
in close proximity to, but having no perceptible bearing on each other.
clamping bolt stud 57 projects upward from the clamping bolt into the cam

page_text: A
slot 47 in the cam ring 45. This cam slot is formed in a line diagonally across the
line of movement of the clamping bolt stud as the clamping bolt is moved.
clamping ring stud extends downward from the under side of the clamping bolt
into an index bolt slot 60 in the index bolt. A cam projection 61 is formed on
the side of the clamping bolt 56. A bolt cover plate 62 is placed over the bolt
sockets in the projection 41 on the turret slide, covering the top and end of said
socket.
A.
A locking lever bracket 63 is secured to the frame of the machine between the
side parts of which a locking lever 64 is pivoted. A cam lever 65 is rigidly
secured to and projects downward from one end of the locking lever to engage
a cam on the turret cam disk 67. A clamping bolt lever 66 is rigidly secured to
and projects upward from the opposite end of the locking lever from that on
which the cam lever is located and is adapted to engage the cam projection 61
from the clamping bolt 56. A plunger head socket is formed in an enlargement
on the locking lever 64 in which is rotatively located a plunger head 69.
plunger 70 extends crosswise through the plunger head having a groove 71 in its
inner end for the reception of the index bolt stud 44. A plunger spring 75
surrounds the shank of the plunger in the plunger head 69, one end of the spring
thrusting against a plug in one end of the plunger head, and the opposite end
against a shoulder on the plunger. The plunger is prevented from being forced
out of the plunger head by means of a nut located outside of the plug in the
plunger head. A stop 73 is secured to the plunger head socket against which the
stop pin 72 is normally held by means of the stop pin spring 74, one end of which
is secured to a pin on the under side of the plunger head, and the opposite end to
the side of the clamping bolt lever. The plunger spring 75 is made with con-
siderable tension and the groove in the end of the plunger is for the purpose of
surely engaging the index bolt stud 44. The plunger head is made rotatable so
that as the turret slide is moved backward the head will swing to one side to allow
the index bolt stud 44 to disengage itself from the groove, the returning spring 74
immediately rotating the plunger head to its normal position to again engage the
stud when said head shall be forced forward by the cam lever 65.
In prior machines of this class an objection arises from the fact that the chips
and dirt accumulating in the operation of the machine and from stock being
operated upon are interposed between the surface of the cams or cam wheels and
the levers which they operate, giving to the levers a greater throw than is intended
and causing a deeper cut to be made in the work. To obviate this I have provided
a removable sectional lever casing consisting of the sections 80 and 81. Each
of these sections are provided with ears 82 having slots that engage, with a snug
fit, pins located with reference to the slots on the frame of the machine. One of
said sections is provided with the pivoted latches 84 which hook over and engage
latch pins 85 on the opposite section. This provides a casing effectually covering
the lever and preventing any dirt or chips from getting onto the surface of the
cams and affecting the working of the levers.
In the production of articles of small diameter and of considerable length, in
working with a tool on the outer surface the article is apt to spring under pressure
of the tool, thus producing defective work. To obviate this I have provided an
overhanging arm 86 which is adjustably secured to the bearings 6. A bracket 87
is adjustably secured to the overhanging arm in which is located a centering
bushing 88. This centering bushing has a central tapered opening to receive
the tapered centering plug 89 secured to the centering arm or bracket 90 which
engages the outer end of the rod of stock being operated upon and prevents it
from springing under the pressure of the cutting tool. A shouldered opening is
formed centrally through this bracket 90, a so-called plug rest holder 91 projects
through and is rotatively mounted in this opening, the head of the holder resting
on the shoulder within the opening. A revolving plug rest is located in a socket
in the end of the plug rest holder and is properly formed to engage the work
projecting from the chuck jaws and to firmly support the outer end thereof. A

page_text: bracket spindle 93 fits the interior screw threaded wall of the larger part of the
central opening through the bracket 90, and is adapted to be screwed down upon
the head of the revolving plug rest holder, to allow free rotation without endwise
play, a locking nut 94 on the outer threaded portion of the bracket spindle securing
the parts firmly together. The shank of the bracket spindle is clamped in one
of the tool sockets in the turret head.
The centering bushing and plug for engagement therewith are bevelled for the
purpose of bringing the revolving plug rest accurately into line with the work as
the turret slide is moved forward, and the firm engagement of the centering plug
in the centering bushing, and of the revolving plug rest with the end of the
work in parallel lines prevents any swinging movement of the work held in the
chuck jaws. The operation of the turret slide and mechanism borne thereon and
appurtenant thereto is as follows:-
The proper tools having been secured within the tool sockets in the turret and
the machine in operation, the turret is intermittently rotated to bring the tools
into proper position to operate upon the work held in the chuck jaws. The
turret slide being at the forward limit of its play, as shown in the views herein,
the ratchet bolt pin 20 is caused to lie in the path of movement of the teeth on
the ratchet 21 by the tension of the ratchet bolt spring 27. As the carriage is
moved backward by the action of the cams on the cam wheel 25 engaging the
turret slide stud 26 the turret is caused to revolve, the ratchet bolt pin being
held stationary with reference to the line of movement of the turret slide.
As the turret slide begins to move backward as above described, the index bolt
stud 44 comes in contact with the outer beveled surface of the cam 77 on the cam
latch 76. This cam latch being prevented from further movement toward the
turret the index bolt stud is caused to slide along the cam surface withdrawing
the index bolt from the bolt sockets 42 in the edge of the index ring 37. This
movement of the index bolt brings the end wall of the index bolt slot 60 into
engagement with the clamping ring stud 58, and as the index bolt receives further
movement the clamping bolt 56 is also moved outward revolving the clamping
ring disengaging the cams and freeing the turret. This operation is performed
just before the ratchet has engaged the ratchet bolt pin to rotate the turret. As
the index bolt stud 44 frees itself by passing beyond the cam projection 77 the
index bolt spring 43 forces the end of the index bolt into engagement with the
edge of the index ring, and as the latter is moved in the rotation of the turret one
of the sockets 42 is brought opposite the index bolt into which the latter is forced
by the index bolt spring. This movement of the index bolt has been independent
of the clamping ring bolt, the index bolt slot 60 being of a length sufficient to
allow this. The length of this slot, however, is just sufficient to locate the clamping
ring stud near to that end of the index bolt slot next to the turret in the forward
movement of the clamping ring bolt.
As soon as the turret slide has reached its backward limit of movement, the
turret having been revolved to proper position to enable the next tool to perform
its share of the work a cam on the turret cam disk 67 engages the cam lever 65
on the locking lever 64 rotating the locking lever and causing the plunger 70 to
engage the index bolt stud 44 on the index bolt 39, forcing the latter home to its
seat in the index bolt socket 42 in the edge of the index ring 37.
A continued rotation of the locking lever is caused for the purpose of bringing
the clamping bolt lever 66 into contact with the cam projection 61 on the clamp-
ing bolt 56 that is forced inward for the purpose of rotating the clamping ring to
firmly seat the turret in the bottom of its socket just after the index bolt has been
forced home to locate the turret in the proper position for the operation of the
tools. The index bolt spring 43 exerts sufficient pressure to force the locking bolt
home, and when said bolt is seated the rotation of the locking lever is permitted
for the purpose of engaging the clamping bolt lever with the cam projection 61
by a backward movement of the plunger 70 against the force of the spring 75.
Immediately after the index bolt has been seated and the clamping ring rotated

page_text: to clamp the turret the cam on the cam wheel permits the cam lever 65 to swing
inward to carry the clamping bolt lever 66 out of engagement with the cam pro-
jection 61, this movement being effected by the pressure of the spring 75. This
movement of the clamping ring bolt after the index bolt has ceased to move
locates the clamping ring stud in that end of the socket in the index bolt next to
the turret so that any movement of the index bolt backward will carry with it the
clamping bolt.
A cam on the turret slide cam wheel now engages the stud on the under side of
the turret slide and moves the latter forward. As the slide is moved forward the
engagement of the index bolt stud 44 with the groove in the end of the plunger 70
causes the plunger head to be rotated to a degree to allow the pin and groove to
be disengaged, when the plunger head is pulled backward by the spring 74 in a
position to again engage the index bolt stud when the turret slide shall have again
been moved backward to its furthest limit.
As the turret slide moves forward the index bolt stud 44 engages that side of
the cam 77 next to the turret, and swings the latch outward under the impulse of
a spring to allow the passage of the index bolt stud beyond the latch which is
immediately returned to place by the spring.
In this forward movement of the turret slide the ratchet bolt is carried along
the outer surface of the ratchet teeth and moves backward against the pressure
of the ratchet bolt spring 27 and as soon as the edge of the tooth is passed this
spring forces the ratchet bolt forward in front of said tooth. This completes onc
operation of the machine.
For varying the rate of movement of the shaft 2 a fast pulley 95 and a loose
pulley 3 are mounted thereon adapted to receive a belt from any suitable source
of power, any desirable device for shifting the belt from one pulley to the other
being employed.
The loose pulley bears a stud 97 on which are rotatably mounted the gears 98
and 99 that are caused to rotate together. The gear 98 is in mesh with the
gear 100 keyed to the shaft 2 and the gear 99 is in mesh with the gear 101 loose
on the shaft but secured to a ratchet 102 having a pawl 103 to hold it against
rotation.
The gear 100, in the device illustrated, contains a greater number of teeth than
the gear 101 and the gear 99 a greater number of teeth than the gear 98, the com-
parative rate of speed of the shaft 2 and the pulley 3 being determined by the
excess in the number of teeth in the gear 100 over that in the gear 101, that is,
the greater the excess of the number of teeth in the gear 100 over the number
of teeth in the gear 101 the greater will be the rate of speed of the shaft 2 as
compared with the rate of speed of the pulley 3. The total number of teeth in the
gears 99 and 101 must in each instance, however, be equal to the number of teeth
in the gears 98 and 100.
In the operation of the device rotation of the pulley 3 imparts movement in the
same direction to the gears 98 and 99, the gear 98 revolving about the gear 100.
In this movement the number of teeth on the gear 101 being less than the number
of teeth on the gear 100 that is held against rotation by the friction on the shaft 2,
the tendency is to rotate the ratchet and gear 101 in an opposite direction to that
in which the gears 98 and 99 are rotated, but by holding the ratchet against rota-
tion by means of the pawl 103 motion is imparted to the gear 100 and the shaft 2
to which it is keyed in the same direction as that in which the pulley 3 is moving.
Should the number of teeth in the gear 101 exceed the number of teeth in the
gear 100 and the number of teeth in the gears 98 and 99 be increased and
diminished respectively the shaft 2 would be revolved in the opposite direction
to the rotation of the pulley 3 when the ratchet is held against rotation.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. In combination with an intermittently revolving turret, means for rotating

page_text: the turret, an index ring borne on the turret and having locking sockets, a spring
actuated index bolt adapted to engage said sockets, and automatic means indepen-
dent of the spring for seating the bolt in a socket, all substantially as described.
2. In combination with an intermittently revolving turret, means for rotating
the turret, an index ring borne on the turret and having locking sockets, a spring
actuated index bolt adapted to engage said sockets, and a locking lever adapted
to automatically engage the index bolt to seat it in its socket, all substantially as
described.
3. In combination with an intermittently revolving turret, means for revolving
the turret, a revoluble clamping ring surrounding the turret, a cam located on
the flat surface of the ring, and means for rotating the ring whereby the turret
is locked or unlocked.
4. In combination with an intermittently revolving turret, means for rotating
the turret, a revoluble clamping ring surrounding the turret, means for rotating
said ring to lock or unlock the turret, and means for preventing the rotation of
the turret whereby locking action of the ring is permitted.
5. In combination with an intermittently revolving turret, means for revolving
the turret, a revoluble clamping ring surrounding the turret, a cam surface on the
ring and means for rotating the ring to cause the cam surface to operate to lock
or unlock the turret, all substantially as described.
6. In combination with an intermittently revolving turret, means for rotating
the turret, a revoluble clamping ring surrounding the turret, a cam surface on the
upper side of the ring adapted to engage the turret, and means for rotating the
clamping ring to exert pressure on the turret in a direction transversely to its
plane of rotation, all substantially as described.
7. In combination with an intermittently revolving turret, means for rotating
the turret, a revoluble clamping ring surrounding the turret, a cam surface on
the upper side of the ring adapted to engage the turret, means for preventing
backward movement of the turret, and means for rotating the clamping ring to
exert pressure on the turret in a direction transversely to its plane of rotation,
all substantially as described.
8. In combination with an intermittently revolving turret, means for rotating
the turret, means for holding it against rotation at intervals, a clamp adapted to
exert pressure upon the turret in a direction transversely to its plane of rotation,
and automatic means for operating the clamp.
9. In combination with an intermittently revolving turret, means for revolving
the turret, means for holding it against rotation, a clamping ring surrounding the
turret and adapted to exert pressure thereon in a direction transversely to its
piane of rotation, and automatic means for operating the clamping ring.
10. In combination with an intermittently revolving turret, means for revolving
the turret, means for holding it against rotation at intervals, a clamping ring
surrounding the turret, and means for rotating the ring whereby pressure is
exerted thereon in a direction transversely to its plane of rotation, all substantially
as described.
11. In combination with an intermittently revolving turret, means for revolving
the turret, locking sockets in the edge of the turret, an index bolt adapted to
automatically engage the locking sockets, a rotary clamping ring, cam surfaces
located between the clamping ring and adjacent surface, and means for rotating
the ring to cause the cam surface to co-operate in locking the turret, all sub-
stantially as described.
12. In combination with an intermittently revolving turret, means for revolving
the turret, a revoluble clamping ring adapted in its rotation to lock or unlock the
turret, and a clamping bolt in engagement with a cam slot in the clamping ring,
and the cam slot located diagonally across the path of movement of the clamping.
bolt, all substantially as described.
13. In combination with an intermittently revolving turret, means for revolving
the turret, a rotatable clamping ring surrounding the turret, and exerting clamping

page_text: action without movement in an axial line, a sliding bolt in engagement with a
cam slot in the clamping ring, and the cam slot located diagonally across the path
of movement of the sliding bolt, all substantially as described.
14. In combination with an intermittently revolving turret, means for revolving
the turret, locking sockets in the turret, an index bolt adapted to engage said
sockets in the turret, a rotatable clamping ring adapted to lock or unlock the
turret in its rotation, and a clamping bolt in engagement with the clamping ring
and with the index bolt and adapted to be withdrawn by the movement of the
latter, all substantially as described.
15. In combination with an intermittently revolving turret, means for revolving
the turret, locking sockets borne on the turret, an index bolt adapted to engage
said sockets, a clamping ring located on the turret, a bolt for operating the
clamping ring, and a single lever operating the index and clamping ring bolts,
all substantially as described.
16. In combination with an intermittently revolving turret, means for revolving
the turret, locking sockets borne on the turret, a spring actuated index bolt
adapted to engage said sockets, a locking lever adapted to automatically engage
the index bolt to seat it in its socket, and a rotatable clamping ring having a
cam surface co-operating with a cam surface on the turret, and adapted to be
operated after the seating of the index bolt, all substantially as described.
17. In combination with an intermittently revolving turret, means for revolving
the turret, locking sockets borne on the turret, a spring actuated index bolt
adapted to engage said sockets, a locking lever adapted to seat the index bolt in
said socket and to rotate a clamping ring, and the rotatable clamping ring adapted
in its rotation to clamp the turret, all substantially as described.
18. In combination with an intermittently revolving turret having locking
sockets, means for revolving the turret, an index bolt adapted to enter the sockets
located in the turret, a rotatable clamping ring, and a lever bearing a spring
seated plunger adapted to engage the index bolt and also operating the clamping
ring.
19. In combination with an intermittently revolving turret, means for revolving
the turret, an index bolt adapted to engage locking sockets located in the turret
and having a slot through which a stud on the clamping ring bolt projects, the
clamping ring bolt for operating a clamping ring, the rotatable clamping ring
adapted to lock the turret, and means for operating the clamping ring and index.
bolts, all substantially as described.
20. In combination with a sliding carriage, means for moving the carriage, a
sliding bolt borne on the carriage, a pivoted lever bearing a rotary head, means
for operating the lever, and a plunger located in the rotary head and adapted to
operate the sliding bolt, all substantially as described.
21. In combination, a base, a pivoted lever borne on the base, a rotary head
mounted on the lever, a plunger located in the head, a sliding carriage, a revoluble
turret mounted on the carriage, locking sockets located in the carriage, an index
bolt adapted to engage said sockets and operated by the plunger on the swinging
head, a clamping ring borne on the turret and adapted to be operated by the
pivoted lever, all substantially as described.
22. In combination with a revolving turret, means for revolving the turret, a
clamping ring borne on the turret, a cam surface on the turret, and a cam located
in a socket in the clamping ring, all substantially as described.
23. In combination with a sliding carriage having a turret socket, means for
sliding the carriage, a revoluble turret located in the turret socket, a clamping
ring mounted on the sliding carriage, and means for rotating the ring to clamp
the turret in its socket and without movement of the ring in an axial line, all
substantially as described.
24. In combination with a sliding carriage, means for reciprocating the carriage,
a revolving turret mounted on the carriage, means for revolving the turret, locking
sockets located in the turret, an index bolt adapted to engage said sockets, a

page_text: revoluble clamping ring mounted on the carriage and a clamping ring bolt for
operating the clamping ring, all substantially as described.
25. In combination with a sliding carriage, means for reciprocating the carriage,
a revolving turret mounted on the carriage, means for revolving the turret, an
index bolt borne on the carriage and engaging sockets in the turret, the sockets
located in the turret, a clamping ring bolt borne on the carriage and operatively
connected with the index bolt, and a clamping ring mounted on the carriage and
operatively connected with the clamping ring bolt, all substantially as described.
26. In combination with a sliding carriage having a turret socket, a revolving
turret located in the socket, means for revolving the turret, an index ring secured
to the turret, an index bolt adapted to engage sockets in the index ring, a clamping
ring cover secured to the carriage and overlying the turret, a rotatable-clamping
ring located in said cover and having a cam surface acting on the turret, a cam
slot in the clamping ring extending diagonally across the path of movement of the
clamping ring bolt, a sliding clamping ring bolt mounted on the carriage, and
means for operating the clamping ring bolt, all substantially as described.
27. In combination with a chuck, a tool holding arm overlying the chuck, a
reciprocating support and a plural number of interengaging projections and
recesses located on the arm and support, all substantially as described.
28. In combination with a chuck, a tool holding arm overlying the chuck, a
reciprocating support, and a plural number of projections having parallel axial
lines, and corresponding recesses located on the arm and support, all substantially
as described.
29. In combination with an intermittently revolving turret, means for revolving
the turret, a flange located on the turret, a clamping ring interposed between said
flange and a part overlying the flange, and means for rotating the clamping ring.
30. In combination with an intermittently revolving turret, means for revolving
the turret, a revoluble clamping ring supported in operative relation to the turret,
a cam surface on the ring, and means for rotating the ring to cause the cam
surface to operate to lock or unlock the turret.
Dated the 17th day of July 1897.
GEORGE EVERETT WITHERELL.
D. Young & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.