Improvements connected with Gear for Fast or Slow Motion at Will of an Attendant.
Year: 1893

page_text: Date of Application, 13th Sept., 1893
Complete Specification Left, 13th July, 1894-Accepted, 18th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements connected with Gear for Fast or Slow Motion at
Will of an Attendant.
I JOSEPH LEWTHWAITE of 11 Nevern Road, Earls Court, London, Engineer
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements connected with gear for fast or slow
motion at will of an attendant, the object being to rapidly alter the speed of the
running shaft of a lathe, a drilling, a milling or other machine as desired without
removing the article under operation.
For the purpose of my invention I arrange a worm thread in the under face of a
free running stepped cone shaped driving pulley and on a loosely keyed sleeve
on the shaft I fit a worm wheel this sleeve has a clutch tooth or teeth on one end
to engage clutch teeth on the boss of the cone; the other end having an annular
groove for a stud or fork end of a shifting lever to ride in. The lever is centred
eccentrically on a pivot pin or a separate eccentric is fitted on the pivot pin to depress
a worm pinion into gear with the cone worm, said worm pinion being suspended by
links from a pivot and removable out of gear by a spring during the fast running of
the shaft. The lever has a handle for actuating the eccentric and also for moving
the clutch sleeve in or out of gear with the stepped cone.
The cone and the sleeve are both on the shaft, the cone being loose, and the
sleeve keyed to slide and also to turn the shaft, whether the sleeve clutch be in gear
with the cone, or not. The cone is always driven by strap in the usual manner,
and when the clutches are in gear, the shaft is driven through the sleeve from the
cone, but when the clutches are out of gear, the cone worm operates the pinion, and
the pinion the sleeve by its gear.
Thus it will be readily understood that for fast motion of the shaft, the driving is
direct through cone and sleeve only, but for slow motion, the sleeve is driven by
the pinion from the cone worm.
101
1000
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said J. Lewthwaite.
COMPLETE SPECIFICATION.
Improvements connected with Gear for Fast or Slow Motion at
Will of an Attendant.
I JOSEPH LEWTHWAITE of 11 Nevern Road, Earls Court, London, 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 connected with gear for fast or slow
motion at will of an attendant the object being to rapidly alter the speed of the
running shaft of a lathe, a drilling, a milling or other machine as desired without
removing the article under operation.
My invention is clearly illustrated in the annexed drawings Figure 1 is a part
sectional elevation of a lathe head with my invention applied.
For the purpose of my invention I arrange a worm thread A in the under or

page_text: inner face of a free running stepped cone shaped driving pulley B and on a loosely
keyed sleeve C on the shaft D'I fit a worm wheel E; this sleeve C has a clutch
tooth For teeth on one end to engage clutch teeth G on the boss H of the cone B,
the other end having an annular groove I for a stud or fork end J of a shifting
lever K to ride in.
The lever K is pivotted to a link L or links carrying a worm pinion M at one
end and pivoted at the other end to some part of the fixed framing of the machine
to which it is applied (in Figure 1 it is applied to a lathe head N) so that on the
movement of a handle P in one direction this being connected to the lever K by the
bar Q, the worm wheel E will be drawn into gear with the toothed pinion M by
the end J of the lever K moving it along the axle, the toothed pinion M being at
the same time put into gear with the worm thread A. in the pulley or driving wheel
so as to reduce the speed of the revolving mandril D. A reverse movement of the
handle P removes the worm wheel E and toothed pinion M out of gear and allows
the axle to revolve its full rate of speed.
The cone B and sleeve C are both on the shaft the cone B. being loose and the
sleeve C keyed to slide and also to turn the shaft D whether the sleeve clutch F
be in gear with the cone B or not. The cone B is always driven by strap in
the usual manner and when the clutches F. G. are in gear the shaft is driven
through the sleeve G from the cone B but when the clutches F. G are out of gear
the cone worm A operates the pinion M and the pinion M the sleeve C by its
gear E.
Thus it will be readily understood that for fast motion of the shaft D the driving
is direct through cone B and sleeve C only but for slow motion the sleeve C is
driven by the pinion M from the cone worm A.
S is a spring for holding the gear in position when in or out of action, or a rack
may be provided for the same purpose.
Figure 2 is a perspective view of the pinion M showing the preferred arrange-
ment of the teeth.
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. The improvements connected with gear for altering the speed of running
shaft of a lathe, drilling, milling or other machine as described and substantially
as shown on the annexed drawings.
2. In lathes or machines for drilling, milling or the like in which the axle or
shaft is driven by the driving wheel, pinion or cone engaging a sliding sleeve on
the axle; altering or reducing the speed of the shaft by meshing the teeth of a
pinion arranged on a link or links pivoted to the machine, with a screw thread or
threads on the driving wheel, pinion or cone and at the same time gearing a worm
wheel on the sliding sleeve with the pinion on the link or links, the whole being
operated by a hand lever pivoted to the link or links as set forth.
3. In lathes or machines for drilling, milling or the like in which the shaft is
driven by the driving wheel pinion or cone engaging a sliding sleeve on the axle or
shaft; the employment of links L carrying toothed pinion M, screw thread or
threads A on the driving wheel, pinion, or cone B and worm wheel E on the sliding
sleeve whereby on the movement of a hand lever pivoted to the link or links L the
toothed pinion M.may be geared with the screw thread or threads on the driving
wheel, pinion or cone and the worm wheel E moved into gear with the toothed
pinion M simultaneously for altering or reducing the speed of the shaft as set forth.
Dated this 13th Jul 1804
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said J. Lewthwaite.