Improvements in Lathes.
Year: 1899

page_text: Date of Application, 22nd June, 1899-Accepted, 2nd Sept., 1899
COMPLETE SPECIFICATION.
Improvements in Lathes.
I, JOHANN MOLL, of 25, Lindenstrasse, Augsburg, Germany, Engineer, do
hereby declare the nature of this invention and in what manner the same is to
he performed to be particularly described and ascertained in and by the follow-
ing statement:
This invention relates to improvements in lathes, the object being to provide a
machine of this kind, in which crank-shafts or crank-pins may be readily and
easily turned and the inner sides of cranks surfaced, without it being necessary
to rotate the crank-shaft, whereby great losses of time and much trouble aro
avoided and a more accurate work done, than would be possible by the usual
devices heretofore employed for the same purpose.
The improvements consist in the construction, novel combination and arrange-
ment of parts fully described hereinafter and specifically pointed out in the
appended claims.
And in order that this my invention may be the more readily understood and
carried into effect or practice, reference is hereby made to the accompanying
drawings, forming a part of this specification, and in which:-
Fig. 1 is a side elevation from the right hand of a lathe constructed in accord-
ance with my invention;
Fig. 2 is a front elevation;
Fig. 3 is a plan view, and
Fig. 4 is a side elevation from the left hand of the lathe;
Figs. 5 & 6 are enlarged detail views of the detachable nut, and
Figs. 7, 8 & 9 are enlarged detail views of the device for actuating the feed-
screws of the tool-holders.
In the drawings, like letters refer to like parts throughout all the figures.
The improved machine is principally composed of the bed-plate A, the car-
riage B, the regulating plate C, the turning device D and the supports E, F.
The crank-shaft to be turned is supported on the supports E, F, and passed
through the turning device D which may be transversely adjusted by means of
the regulating plate C, so that the centre of said device is rotated on the center
line of the crank-pin, or at a distance equal to the length of the crank-arm.
The lateral displacement of the device 1) for turning crank-pins is effected by
means of the carriage B, and the feed of the tools for planing or surfacing the
inner sides of crank arms is effected by means of a device operated by the rota-
tion of the turning device D, said device being out of engagement when it is.
desired to turn crank-pins so that the rotation of the turning device does not
produce the feeding of the tools. The rotation of the turning device is obtained
by means of gearings hereinafter fully described with other parts of the operat-
ing mechanism.
i
The movement is transmitted to the machine by means of the drive-pulley 1,
keyed on the shaft 2. A bevel gearwheel 3 the hub of which is provided with
an inner key, is mounted in brasses under the carriage B and adapted to slide
Said
along said shaft 2 in a longitudinal key-way provided on the latter.

page_text: wheel 3 meshes with another bevel wheel 4, mounted on the end of a vertical
shaft 5 arranged in the carriage B and carrying at its other end a bevel wheel 6,
meshing with wheel 7. Through the latter passes a shaft 8 by means of a key
and key-way, said shaft being loosely mounted in a bearing on carriage B and
journaled in the regulating plate C. The shaft 8 carries a gear-wheel 9, meshing
with another gear-wheel 10 mounted on the shaft 11, which carries the bevel gear-
wheel 12, meshing with wheel 13, mounted on the frame of the turning device D
and made integral with another gear-wheel meshing with the toothed rim of the
inner ring of said device to rotate the same.
The turning device D is secured on the regulating plate C, holding said device
at right angles with the axis or center line of the crank-shaft, and serving to
move the device transversely to said shaft in accordance with the length of the
crank-arms to be worked. The regulating plate C is moved in grooves 14 pro-
vided in the carriage B, and said plate may be secured in adjusted positions by
means of a screw 15.
The lateral movement of the turning device D is obtained by the displacement
of the carriage B; to this end, the latter is provided with a detachable nut 16,
actuated by means of a screw-shaft 17. On the end of said shaft 17 is mounted
a gear-wheel 18 meshing with another gear-wheel 19 mounted on an intermediate
shaft, carrying a gear wheel 20 meshing with a wheel 21 on the end of a shaft 22,
the other end of which carries a gear wheel 23 meshing with a gear wheel 24 on an
intermediate shaft, which carries another gear-wheel 25, meshing with one of the
wheels 26, 27 on the clutch 28, the axle of which carries the gear-wheel 29 and
pulleys 30. The latter are suitably connected by means of belts or equivalents
with pulleys 31, mounted on an intermediate shaft carrying a gear-wheel 32,
meshing with the gear-wheel 33 on the aforesaid shaft 2.
The clutch 28 is actuated by means of an arm 34 on the shaft 35, on which
may move longitudinally another arm 36, mounted in a brass 37 of the carriage B
and pivotally connected with a rod 38, actuated by means of a lever 39 pivoted at
the front of the carriage and adapted to be adjusted in a slot 40 by means of
a bolt or equivalent 41. The clutch 28 serves to bring into engagement the
wheels 29, 26, 27 and 25, or the wheels 29, 20 and 25 as desired in accordance
with the movement to be imparted to shafts 22 and 17.
The nut 16 which produces the movement of the carriage B by the rotation of
the screw-shaft 17, is composed of two halves 42, 43 (see Figs. 5 and 6), housed
in a box or casing 44 secured to the carriage B. Said nut-sections are provided
with a lower extension 45 engaging a recess in said box 44 to prevent the nut
from rotating, and with a lateral extension 46, to which is secured a pin 47,
serving to move the nut-sections laterally and to detach them from the screw-
shaft 17 or to bring them into engagement with the latter. Said pins are moved
in grooves provided in said box 44 and actuated by means of levers 48, 49 pivoted
on the box and connected with each other by means of a rod 50. The lever 49
is operated by means of a rod 51 provided with a lever 52 pivoted on the car-
riage B. The nut 16 is mounted in the box 44, providing a certain play, so that
.slight deviations of the screw-shaft 17 do not influence the direction of the car-
riage.
The carriage. B may be moved by hand by means of a lever 53 actuating a
wheel 54 by means of pawl and ratchet, said wheel being adapted to slide along
the shaft 22 and mounted in a brass under the carriage B. The movement of
said wheel 54 and shaft 22 is transmitted to shaft 17 and 16, and carriage Bas
already described. During the displacement by hand of the carriage, the above
mentioned clutch is placed so as to disengage the wheels 26 and 27 from the
wheel 25.
The carriage B and the supports E, F, may be moved by hand, for instance,
for adjusting the shaft to be worked in place, by means of a rack 55 secured to
the frame A and engaged by a wheel 56 provided for each support and for the
carriage. Each wheel 56 is provided with a ratchet 57 and a lever 58 having a

page_text: pawl for engaging said ratchet. When it is desired to move the supports E, F,
it is necessary to loosen the nuts 59 serving to secure said supports on the
frame A, and when it is desired to move the carriage, it is necessary to detach
the nut 16 from the screw-shaft 17 by means of the lever 52.
The supports E, F, are composed of uprights 60, 61 serving to support the ends
of the shaft to be worked, said shaft-ends being held in place by means of plate
or covers 62, secured in place by means of screw-bolts 63. The support F is
further-more provided with means for supporting cranks, said means embodying
an upright 64; adapted to be moved laterally by means of screw-bolts 65 in
horizontal grooves 66 provided in the upright 61. The upright 64 has a hori-
zontal arm 67 in which a bolt 68 may be moved, the crank arm of the shaft to
be worked resting on the head of said bolt. Said crank arm is tightened by
means of a screw-bolt 69 and claw 70.
The turning device 1) is composed of an outer ring 71 secured onto the regulat-
ing plate C, and of an inner ring 72 provided with an annular dovetail rib
engaging a corresponding groove in said outer ring, said inner ring being adapted
to be rotated in said outer ring. The inner ring 72 is provided on one side with
a toothed rim to receive the movement by means of the afore described gear-
wheels. To opposite sides of said inner ring are secured two parallel cross-bars
or guides 73, 74, on which the tool-holders 75, 76 are adapted to be moved.
The tool 77 may be inserted into the tool-holder longitudinally at 78 for turning
crank-pins, and transversely for planing the surface of the inner sides of the
crank-arms, or transversely at 79 for planing the surface of the inner sides of
longer crank-arms.
For turning crank-pins, the device D is rotated and moved laterally; for plan-
ing or surfacing said device is rotated without moving laterally, the tool-holders
being moved radially by means of the feed-screws 80 engaging the nuts 81 in
the tool-holders. Said feed-screws are actuated by means of devices 81 operated
during the rotation of the ring 72 by two lugs 82, 83 secured to an arm 84 held
in an eye 85 preferably made one with the outer ring 71.
The said device 81 (see Figs. 7, 8 and 9) embodies a triangular box or casing
86 through the centre of which passes said screw 80. The box or casing 86 is
closed by means of a cover 87 and adapted to freely move with the latter about
a sleeve 88, keyed upon the end of screw 89. Said sleeve 88 carries a gear-
wheel 8 housed in said box or casing 86. Two pawls 90, 91 pivoted in the latter,
are normally held in engagement with said gear-wheel 89 by the action of a
spring 92.
A block 93 provided with a screw and nut 94 bearing against a flat
spring 95, is moved laterally in one of the walls of said box 86 and serves to
disengage one of the pawls 90, 91 as required. When the block 93 is in its
central position, both pawls are in engagement and the feed-screws 80 may be
actuated by hand in either direction by means of the device 81. When the
pawl 91 is engaged only, the lugs 82, 83 operate to rotate the screws 80 to the
left hand, and when the pawl 90 is engaged only the screws 80 are rotated to
the right hand, that is, in the first case, the tool-holder moves towards the centre
of the apparatus, and in the second case, said tool-holder moves away from said
centre.
The positions of said lugs 82, 83 are indicated in Fig. 9. The lug 83 may
occupy different positions for the purpose of modifying the movement of the feed-
screws 80. When the lug is in the position indicated by reference letter a, the
triangle 81 comes before the lug 82 in the position a to occupy the position c
after passing before the lug 82 and before passing at the lugs 83, whereupon it
comes back into the position a. When the lug 83. is in the position b, said
triangle will successively occupy the positions b, c, b. In the second case the feed-
screws will be rotated at a greater velocity than in the first case.
The feed screws are rotated in one direction only when one pawl engaged.
In the positions shown in the drawings, the pawl 91 being alone engaged, the
feed-screws are rotated to the left hand only by the action of the lug 82, and the

page_text: return of the triangle under the action of the lug 82 disengaging the pawl 91
from the ratchet '89, the feed-screw 80 will not be actuated in this period.
It will be readily understood that many changes and modifications may be made
in the relative arrangement and minor details of construction of the various
parts without departing from the scope or sacrificing any of the advantages of
the invention, and 'I wish it therefore to be understood that I do not restrict
myself to the precise arrangement and construction herein shown and described.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
10) The improved lathe for turning crank-shafts, comprising a rotatable turn-
ing device, a regulating plate carrying said turning device, a carriage carrying
the regulating plate, a bed-plate to support the carriage, supports secured onto
said bed-plate, a-device for actuating the turning device, means for automati-
cally moving the carriage, means for moving said carriage by hand, and means
for disengaging the automatic device when the turning apparatus is to be
actuated by hand, substantially as set forth.
20) The improved lathe for turning crank-shafts, comprising a bed plate, a
carriage, a regulating plate and supports, in combination with a support secured
to said regulating plate, a tool-holder rotatably mounted in said support, means
for rotating the tool-holder, and means for feeding the said carriage, substantially
as set forth.
30) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, and suitable crank-shaft supports, in combination
with an outer ring secured on the regulating plate, rotatable ring properly guided
in said outer ring, adjustable tool-holders on the inner ring, means for feeding
the tool-holders during the operation of the machine, means for rotating the
inner ring, and means for actuating said carriage, substantially as set forth.
4°) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, and crank-shaft supports, in combination with an
outer relatively stationary ring secured on said regulating plate, a rotatable inner
ring properly guided in said outer ring, cross-bars of suitable form on said inner
ring, movable tool-holders on said cross-bars, means for automatically feeding
the tool-holders on said crossbars, means for rotating the inner ring, and means
for feeding the said carriage, substantially as set forth.
5°) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, and crank-shaft supports, in combination with an
outer relatively stationary ring secured on said regulating plate, an inner rotat-
able ring properly guided in said outer ring, cross-bars of suitable form on said
inner ring, tool-holders adapted to slide on said cross-bars and actuated by means
of feed-screws, means for automatically actuating the latter, means for rotating
the inner ring, and means for feeding the said carriage, substantially as set forth.
60) The improved lathe for turning crank-shafts, comprising a bed-plate, a car-
riage, a regulating plate, and crank-shaft supports, in combination with an outer
relatively stationary ring secured on said regulating plate, an inner rotatable
ring properly guided in said outer ring, movable tool-holders in said inner ring,
screw-shafts engaging said tool-holders and having means for engaging a
stationary lug or equivalent, as said inner ring is rotated, means for rotating the
inner ring, and means for feeding the said carriage, substantially as set forth.
70) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, and crank-shaft supports, in combination with an
outer relatively stationary ring on said regulating plate, an inner rotatable ring
properly guided in said outer ring, movable tool-holders on said inner ring, feed-
screws engaging said tool-holders, a double catch and ratchet device and said feed-
screws and adapted to engage a stationary lug or equivalent as said inner ring is
rotated to automatically feed the tool-holders in either direction along their respec-

page_text: tive guide-ways, means for rotating said inner ring, and means for feeding the
said carriage, substantially as set forth.
8°) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, and a rotatable turning device, in combination with
suitable supports for supporting the ends of the shaft to be worked, an adjust-
able support for holding the crank-arms in horizontal positions, means for adjust-
ing said support, means for rotating the said turning device, and means for feed-
ing the said carriage, substantially as set forth.
99) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, a rotatable turning device, and crank-shaft supports,
in combination with a detachable nut housed in a box or casing under the car-
riage, a feed-screw engaging said nut and serving to feed said carriage, means for
actuating said feed-screw, and means for rotating the said turning device, sub-
stantially as and for the purpose set forth.
10° The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage, a regulating plate, a rotatable turning device, and crank-shaft supports
in combination with a clutch device carrying an engaging wheel and an inter-
mediate wheel, a system of levers for operating said clutch device, means for
automatically feeding the carriage, and means for rotating the said turning
device, substantially as set forth.
11°) The improved lathe for turning crank-shafts, comprising a bed-plate, a
carriage a regulating plate, a turning device, and crank-shaft support, in com-
bination with a clutch-device, a system of levers for operating said clutch device,
means for feeding the carriage by hand, and means for rotating the said turning
device, substantially as set forth.
120) The improved lathe for turning crank-shafts, constructed and operating
substantially as described and shown in the annexed drawings.
Dated this 2nd day of June 1099.
EDWARDS AND CO.,
Chartered Patent Agents, 65 and 66, Chancery Lane, London,
Agents for the Applicant.