Year: 1885

page_text: I, PIERRE PHILIPPE HURE, of Paris in the Republic of France, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to the construction of a slide rest and its tool holder with
means of rapidly moving and setting the rest and turning the holder rapidly
round so as to present different tools to the work, of fixing it in position and of
giving it either a quick or slow movement forwards or backwards. The tool holder
is mounted on a central vertical bolt on which it can turn as an axis. On the
upper end of a bolt is fixed a boss carrying a spring pawl which engages with a
ratchet fixed on the tool holder. The lower end of the bolt has a head shaped as
a cam which can be turned round till it meets a stop, its cam protuberance as it
turns pushing back a spring bolt which keeps the tool holder in position. The
operative by means of a hand lever applied to the boss, turns the bolt partly round
in one direction, its pawl passing the teeth of the ratchet and its cam head dis-
engaging the spring bolt; then on throwing it backwards the pawl engaging the
ratchet turns the tool holder until the spring bolt again enters a notch or hole
presented to it. Thus by a succession of to and fro strokes of the hand lever,
which can be rapidly made, the tool holder may be turned round one, two or more
divisions as may be desired. The holder itself may be of square or polygonal form
with its sides grooved to receive different tools fixed by set screws in the several
lateral grooves. The screw for advancing the tool holder, can be worked either
directly by hand, when a rapid movement either forwards or backwards is
required, or, when its movement is desired to be slow, the screw is worked by
worm gear from a separate handle. The slide rest is held on the saddle by a
central bolt connecting them, and transversely through this bolt passes a pin
which is slightly eccentric to a spindle that extends outside the body of the rest
and can be turned by a wrench. On turning it in the one direction, its eccentric
pin-end slackens the bolt and then the rest can be turned on the saddle to the
desired altitude. Then on turning back the spindle, its eccentric pin tightens the
bolt which clamps the rest in its position on the saddle. In a similar manner,
the bolt which, passing down through the slot of the lathe bed, holds the saddle on
the bed, can be tightened or slackened by an eccentric pin passing transversely
through its head below the lathe bed.

page_text: I, PIERRE PHILIPPE HURE, of Paris in the Republic of France, 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 the construction of a slide rest and its tool holder with
means of rapidly moving and setting the rest and turning the holder rapidly round
so as to present different tools to the work, of fixing it in position and of giving it
either a quick or slow movement forwards or backwards. The tool holder is
mounted on a central vertical bolt on which it can turn as an axis. On the upper
end of the bolt is fixed a boss carrying a spring pawl which engages with a ratchet
fixed on the tool holder. The lower end of the bolt has a head shaped as a cam
which can be turned round till it meets a stop; its cam protuberance turns pushing
back a spring bolt which keeps the tool holder in position. The operator by means
of a hand lever applied to the boss, turns the bolt partly round in one direction, its
pawl passing the teeth of the ratchet and its cam head disengaging the spring bolt;
then on throwing it backwards, the pawl engaging the ratchet turns the tool
holder until the spring bolt again enters a notch or hole presented to it. Thus by
a succession of to and fro strokes of the hand lever, which can be rapidly made,
the tool holder may be turned round one, two or more divisions as may be desired.
The holder itself may be of square or polygonal form with its sides grooved to
receive different tools fixed by set screws in the several lateral grooves. The screw
for advancing the tool holder, can be worked either directly by hand, when a rapid
movement either forwards or backwards is required, or, when its movement is
desired to be slow, the screw is worked by worm gear from a separate handle.
The slide rest is held on the saddle by a central boss connecting them, and
transversely through this bolt passes a pin which is slightly eccentric to a spindle
that extends outside the body of the rest and can be turned by a wrench.
turning it in the one direction, its eccentric pin-end slackens the bolt and then the
rest can be turned on the saddle to the desired altitude. Then on turning back
the spindle, its eccentric pin tightens the bolt which clamps the rest in its position
on the saddle. In a similar manner, the bolt which, passing down through the
slot of the lathe bed, holds the saddle on the bed, can be tightened or slackened by
an eccentric pin passing transversely through its head below the lathe bed.
On
Fig. 1 of the accompanying drawings shews a vertical longitudinal section of a
lathe with the above described improved slide rest applied thereto; Fig. 2 shews a
cross section on line a b; Fig. 3 is a plan of the slide rest; Fig. 4 is a vertical
section on line c d; Fig. 5 shews a modified construction.
A is the bed of the lathe, B the headstocks cast thereon, the upper face of the
bed being formed with V rails as shewn at the section Fig. 2 so as to allow of
ready displacement of the slide rest. The slide rest C is arranged to revolve on a
central bolt E carried on the saddle D.
The upper end of the bolt E fits with flat sides in a cap G, through which, as
also through the bolt, passes the hand lever F. Within the cap G is a vertically
sliding pawl or catch H, taking into rachet teeth J fixed or formed on the saddle
rest. The head of the bolt E at bottom is formed as a cam for the purpose of

page_text: disengaging the spring catch K of the slide rest and at the same time regulating
the rotation of the latter, according to the number of the tools carried thereby.
When the operator desires to turn the slide rest, he turns by means of the lever F
the cap G, as also the bolt E, thereby disengaging the catch K which holds the
slide rest C; during this motion the pawl H slides over the ratchet teeth J. The
rotation is stopped on the notch of the bolt's head coming in contact with the
stop b, whereupon the operator turns the parts back again to the original position;
and as in this motion the pawl H catches in the ratchet teeth J, the slide rest C
will be carried round with the other parts. The spring catch K being liberated by
the bolt head, presses against the circular edge of the slide rest until by its
rotation a notch in the latter comes opposite the former so that this, in entering,
holds the slide rest in the position in which it has been turned. The part of the
lever F that passes through the eye of the bolt E is formed as an excentric, so that
if, when the slide rest has been turned into the desired position, the lever is turned
down from the position shewn in Fig. 1-it will cause the bolt to tighten the slide
rest down upon the saddle and thus hold it securely in position.
The slide rest is mounted on a saddle D which works in the direction of the
lathe's longitudinal axis upon the turning support N, such motion being effected
rapidly when required by turning directly the screw spindle M O with quick
pitch, or more slowly, by turning the axis of the worm P gearing with a worm
wheel q on a bush carried by the saddle and having a female screw thread fitting
on the screw spindle MO. The support N is pivotted on a transverse carriage R
for operating on conical objects, and is secured in any desired position by means
of the spindle S having an excentric pin entering an eye in the swivel bolt T, so
that by turning the spindle S the parts are tightened together by the bolt T. The
transverse carriage R has a lateral groove in which slides the head of a bolt that
serves to fix a lug R¹ carrying a regulating screw. The bolt and lug may be placed
either as in Fig. 3 or in the opposite position, and the regulating screw serves to
limit the inclination of the carriage R, which has a stop ✗ of epicycloidal form,
against which the said screw is made to bear, the epicycloidal surface being so
determined according to the different angular positions assumed by the carriage,
that the screw may always bear normally thereon.
The slide U which carries all the above named parts, is fixed on the lathe bed
by a bolt T¹ through an eye at the lower end of which passes an excentric formed
on the spindle S₁ carried by a loose block V bearing on the underside of the lathe
bed, so that on turning the spindle by its handle, the slide U and block V are
tightened on the bed.
The slide rest a shewn at Fig. 5 is the same in principle as that above described,
being pivotted on the saddle b by the bolt c. The lever d has a fork with cam
surfaces bearing upon the cap g and it is pivotted to the bolt c; when the lever
is in the raised position shewn, its cam surfaces tighten the bolt and cap, and thus
secure the slide rest in position. For turning the latter, the lever is first turned
down to a horizontal position, so as to loosen the bolt, after which it is turned
round, thereby also turning the cap and bolt. The head on the lower end of the
latter has an incline e¹ which, as it is turned, depresses the spring arm e carrying
the catch f, which is thus withdrawn from the hole in the slide rest, the turning of
the bolt being arrested at a certain point by a stop, as before; the parts are then
turned back again, and carry with them the slide rest by means of the pawl and
ratchet gear in the cap.g operating as in the first arrangement. The catch again
springs into a hole of a after this has been turned partly round, and the handle d
is then turned into the vertical position again, so as to tighten the parts together.
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 in respect of slide rests for lathes:
1. Arranging the slide rest to rotate upon a bolt carried by the sliding saddle,
the said bolt being tightened by a lever with excentric which lever also serves to

page_text: effect the rotation of the slide rest by a pawl and ratchet mechanism, while at the
same time the rotation is limited by a spring catch operated by the said bolt,
'substantially as herein described.
.
2. The use for advancing or withdrawing the slide rest saddle on the pivotted
support, of a screw spindle carried by the support passing through a screwed bush
on the saddle, the screwed spindle.being rotated by hand when a quick motion of
the saddle is required, while when a slow motion is required the bush is rotated
by a worm and worm wheel, the screw being held stationary, substantially as herein
described.
3. The arrangement herein described of fixing the pivotted support in position
on the transverse carriage by means of a spindle having an excentric fitted in an
eye of the pivot bolt, so that when the excentric is turned it effects the tightening
up of the pivot bolt, and pivotted support.
4. The arrangement herein described for fixing the slide carrying the slide rest
upon the lathe bed by means of a bolt fixed to the slide and having an eye at its
lower end into which fits an excentric on a' spindle carried by a loose block on the
underside of the lathe bed.
5. The combination of the revolving slide rest carrying several tools, with the
saddle, pivotted support, transverse carriage and slide, arranged and operating as
herein described with reference to the accompanying drawings.
ABEL & IMRAY,
Agents for the Applicant.