Year: 1897

page_text: 1. HENRY WILLIAM TONKS, of Hockley Hill, in the City of Birmingham, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction and arrangement of
lathes, for turning studs, pins, or the like articles, and primarily intended for the
manufacture of the rivet or pivot pins employed in cycle chains, which said pins
require to be reduced in diameter for a given distance, from each end but although.
specially designed for this purpose, it is clear that it may be employed for other
suitable purposes.
It consists broadly as follows:- -Upon a suitable bed, are carried two secondary
beds or frames upon each of which is mounted a sliding head stock, with spindle,
driving pulley &c. These spindles are in line with each other and face towards
each other, having the necessary cutting tools carried thereon. These spindles
are preferably driven in opposite directions so that the tools may simultaneously
act upon the work, which latter is stationary. At the rear of the machine is a cam
shaft carried in suitable bearings and driven by band and pulley. Each sliding
headstock is reciprocally moved towards and from each other by means of lever
mechanism interposed between them and their respective cams upon the cam shaft.
The secondary beds are adjustably secured to the main bed.
At
Between the two said headstocks and carried from the main bed, we now provide the
work feeding holding or gripping mechanism, which may broadly consist of a recipro-
cating slide carrier, or may consist of an intermittent rotary carrier actuated from
the aforesaid cam shaft. When made of the slide type, such slide is made to travel
below a hopper or the like so that at each forward stroke one piece (to be worked
upon) is carried forward to the central position and in line with the cutters.
this moment a pressure lever or sliding block is also brought to bear upon the
piece so as to firmly hold it in its bed in the slide to prevent its movement while
under the cutting operation. This pressure lever &c., is also operated from the
cam shaft. Instead of this sliding feed however I may use the intermittent rotary
feed as before intimated, in which case, a number of peripherical grooves are
made in the disc, into which the articles drop from a hopper like feeder. This
rotary feeding disc is operated by a pawl and ratchet movement, the said pawl being
carried from a lever operated from the cam shaft. Instead however of carrying
the pawl directly upon the said lever, I attach it to a secondary adjustable lever,
which latter is carried upon the main lever; and is so arranged that the pawl
5 pivot can be advanced or receded by screw mechanism, as to very finely adjust the
A similar
final position of the work when subjected to the cutting operations.
device is also used when adopting the sliding feed and for the same purpose.
Thus by these means, the work is automatically brought forward and held firmly

page_text: position wine the revolving cutters advance and operate upon the piece, and
then recede, when the finished piece falls away, and a repeat operation follows.
1
position wine the revolving cutters advance and operate upon the piece, and
then recede, when the finished piece falls away, and a repeat operation follows.
Dated this 20th day of May 1897.
CHARLES T. POWELL,
Applicant's Agent.
gus, rins, or the like Articles
I, HENRY WILLIAM TONKS, of Hockley Hill, in the City of Birmingham, 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 :-
This invention relates to improvements in the construction and arrangement of
lathes, for turning studs, pins, or the like articles, and primarily intended for the
manufacture of the rivet or pivot pins employed in cycle chains, which said pins
require to be reduced in diameter for a given distance from each end but although
specially designed for this purpose, it is clear that it may be employed for other
similar purposes.
In order to more clearly explain this my invention I have appended hereunto
illustrative sheets of drawings upon which are figures and numbers of reference,
similar numbers referring throughout the several views to the same thing or part.
Fig. 1, is a front elevation of the principal parts of the machine.
Fig. is a general plan view of the machine.
Fig. 3, is a part sectional end view of the machine showing more particularly the
slide feed mechanism.
Fig. 4, is a detailed front view of the hopper mouth spring otherwise shown :
in Fig. 3.
Fig. 5, is a part sectional view showing the gripper tools closed upon the piece to
be operated upon.
Fig. 6, is a detached plan view of the slide tool.
Fig. 7, is a part end view in detail showing the levers for operating the sliding 3
headstocks.
Fig. 8, is a part sectional view showing the modified rotary feed.
Fig. 8, is a detailed view showing the gripping device (otherwise shown in
Fig. 8) in its opened position to permit of the discharge of the finished work.
Fig. 8, is a similar view to Fig. 8 but showing the parts disposed to receive the 3
next piece to be operated upon-from the rotary wheel.
Fig. 9, is a part plan view of some of the important parts of the rotary feed.
Fig. 10, is a view of sample piece to be operated upon. Fig. 11, shows the said
piece under cutting operation of tools.
It consists as follows:--Upon a suitable bed 12, are carried two secondary beds 4
or frames 13 and 14 upon each of which is mounted a sliding head stock 15, with
spindle 16, driving pulley 17 &c. These spindles are in line with each other and
face towards each other, having the necessary cutting tools 18, carried thereon.
At Fig. 10 is shown a rivet or pin 19 which may be taken as a sample piece to be
operated upon by the machine, in which it is desired to reduce the diameter at 4
each end as shown in Fig. 11, in which latter view it will be seen that the
tools 18, 18, are tubular, and having on their end faces cutting teeth so that as
they approach each other the metal is cut away as shown.
These spindles 16 are preferably driven in opposite directions, so that the tools
may simultaneously act upon the work 19 which latter is stationary. At the rear 50

page_text: of the machine is a cam shaft 20 carried in suitable bearings 21 and driven by
band and pulley 22. Each sliding head-stock is reciprocally moved towards and
from each other by means of lever mechanism interposed between them and their
respective cams upon the cam shaft. Such mechanism may be varied, but that
shown is effectual, in which the levers 23 and 24 are fulcrumed at 25; the levers 23
engaging with the headstock and the levers 24 being operated by the cams 26.
The secondary beds 13 and 14 are adjustably secured to the main bed.
Between the two said headstocks and carried from the main bed 12, we now
provide the work feeding and holding or gripping mechanism, which may broadly
consist of a reciprocating slide carrier, or may consist of an intermittent rotary
carrier actuated from the aforesaid cam shaft.
at 19"
I will first describe it as constructed upon the slide type and illustrated in
Figs. 1 to 6. 27 is a hopper into which the pieces 19 are fed. Below this is the
slide 28 upon which is supermounted the slide feed tool 28. This slide is operated
by lever 29, whose roller 30 is acted upon by the cam 31. The slide tool 28" is
shaped at its front end so that the pieces 19 one by one may drop therein as seen
At 32 is a little projection or swell upon the tool 28" so that as it travels
to and fro it shall shake up the pieces 19 to ensure them being free to drop upon
the fore end of the tool. 33, is a spring fork which prevents the piece 19 falling
off the tool 28". 34 is a block firmly secured to the slide bed 35, and to the front
of this block is secured the steel die 36 whose upper fore part is shaped to suit the
pins 19. 37 is a pressure plate secured at 38. 39 is an adjusting gauge carried
upon the lever 40 pivoted at 41 and operated by cam 42. The action is therefore
as follows:-Upon the advance of the slide 28" one of the pieces 19 is carried
forward to the position as shown in Fig. 5, and as it nears this position the bottom
end of the spring 33 slips over it as seen in Fig. 5. The piece is thus pushed
beneath the nose of the plate 37 and is further gripped and firmly held between the
tool 28" and the die 36. While thus held the headstocks &c. with the tools 18, 18,
are simultaneously brought together by the cams 26, and the cutting effected as
seen in Fig. 11 when the said headstock &c. are again withdrawn. Upon the
receding movement of the slide 28", it will be seen that the spring 33 would prevent
the finished piece 19 returning with it should it endeavour to do so, while the
plate 37 would ensure it being pushed from the die 36, leaving the tools free to
receive the next piece. The purpose of the gauge 39 may be now explained. It
sometimes happens that the piece 19 is not exactly in the correct lateral position,
hence the said gauge is pushed forward to meet the advance of the slide 28" and
adjusts the position of the piece 19 just prior to its being finally gripped against the
die 36. Before the cutters 18 advance the gauge is withdrawn. Instead of this
sliding feed however I may use the intermittent rotary feed as before intimated
Figs. 8 to 9, in which case, a number of peripherical grooves 43 are made in
the disc 44, into which the articles 19 drop from a hopper like feeder 27ª. This
rotary feeding disc is operated by a pawl 45 and ratchet movement 46, the said
pawl being carried from a lever 47 operated from the cam shaft 20. Instead
however of carrying the pawl directly upon the said lever 47, I attach it to a
secondary adjustable lever 48, which latter is carried upon the main lever; and is
so arranged that the pawl pivot can be advanced or receded by screw mechanism 49,
as to very finely adjust the final position of the work when subjected to the cutting
operations.
"
In this case the die 36 is placed upon the opposite side to that before described
and may with advantage, be formed in one piece with the frame 35ª that carries
the hopper 27 and the grip slide 28b. At 50 inclined projections are placed upon
each side of the disc 44 so that as the disc revolves the articles 19 are forced from
the grooves 43. 33" is a spring plate which guides the articles to the gripping
tools. The tool 28 is operated by the lever 29ª, sliding rod 51 which latter is
operated by cam 31". 37 is a spring forked plate which forces off the finished
piece 19 when the slide 28b recedes. As before intimated Fig. 8 shows the grip
opened so as to permit the falling away of the finished work, while Fig. 8 shows

page_text: It may
the partial forward position of the tool ready to receive the next piece 19.
be here observed that by reason of the downward pressure of the plate 33 the
pieces 19 will not pass forward until forced by the intermittent movement of the
disc 44, and that this latter is times to meet the position of tools as shown in
Fig 8.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is
1. In lathes for turning or similarly treating studs, pins or the like articles, the
combination with sliding headstocks 15, spindles 16, having rotary cutters 18, of
the hopper device 27, sliding tool 28" with grip die 36 and their accessory parts,
all substantially as set forth and shown.
2. The modified combination with the sliding headstocks 15, spindles 16, having
rotary cutters 18, of the intermittent rotating disc 44 having grooves 43, and
incline 50 plate 33, slide 28 and die 36" with their accessory parts substantially
as set forth and shown and for the purposes specified.
3. The combination with the hopper 27 and sliding tool 28", of the swell 32 as
shown and described.
4. The combination with the hopper 27 and sliding tool 28%, of the gauge 39
substantially as set forth and shown.
5. In lathes for turning or similarly treating studs, pins or the like articles,
the general con bination and arrangement comprising this my improved machine
substantially as set forth and described in Figs. 1 to 7 inclusive.
6. In lathes for turning or similarly treating studs, pins or the like articles,
the modified general combination and arrangement of the sliding headstocks with
their revolving cutters and their necessary details and the rotary feed mechanism
all substantially as set forth and shown in Figs. 7 to 11 inclusive and partly in
Figs. 1 to 6 inclusive.
Dated this 28th day of June 1897
CHARLES T. POWELL,
12 Cherry Street, Birmingham, Applicant's Agent.