New or Improved Starting, Stopping, and Reversing Gear for Machinery Driven by Gas or Vapour Engines.
Year: 1891

page_text: Date of Application, 28th Dec., 1891
Complete Specification Left, 28th Sept., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
New or Improved Starting, Stopping, and Reversing Gear for
Machinery Driven by Gas or Vapour Engines.
I, PETER BURT of Henrietta Street Glasgow, Lanarkshire, Scotland, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to mechanism for engaging and disengaging the connection
between the driving shaft of gas engines and the machinery which it drives, and
consists in the arrangement, combination or construction of parts of said gear
whereby it is made also capable of reversing the direction of motion between driver
and follower; and is specially applicable for use with gas or explosive oil or vapour
engines for starting stopping or reversing road cars, marine propellers, hoists, or
other machinery driven thereby.
As constructed according to my invention the motor driving shaft has mounted
thereon or fixed thereto at a certain distance apart two frictional driving wheels or
pulleys. At right angles to said driving shaft is mounted the driven shaft or
shafts. On one end of driven shaft is a disc against the face of which, either of the
aforesaid driving wheels is brought into frictional contact according to the direction
which it is desired to drive. Both said driving wheels cannot be in contact with
disc at same time, and when both are out of contact with disc the driven shaft will
obviously stop. The speed of driven shaft may be varied by causing the driving
wheel to approach or receed from towards the centre of driven disc. Two driven
discs may be used, one on each side of driving shaft, and their respective shafts
geared together or not. The discs may be mounted so as to be pressed by springs
or equivalently otherwise inwards towards the driving wheels shaft. The two
driving wheels may be moved across face of disc by a clutch or its equivalent.
or.,
Under another modification the mechanism comprises a disc on engine driving
shaft, against the face of which bears the periphery of a friction driven drum or
pulley on the driven shaft approximately at right angles to engine shaft. The
driving disc is made with a recess in its centre so that when the driven drum
is moved, opposite said recess it shall be out of contact with the disc and thus not
driven thereby; and when the drum is moved to other side of disc from that
formerly used the motion of driven shaft is reversed; the relative speeds being
greater or less according to position of drum on annular frictional driving surface of
disc. The drum is made so as to slide along its shaft and is moved into and kept
in position by a holder worked by a screw. To prevent the drum shaft from yield-
ing or springing, the holder may be provided with a pulley on its back to work
against, a straight guide, or it may simply have an antifriction slipper sliding on a
guide.
Dated, this 23rd day of, December 1891.
DAVID F. MASON,
Glasgow, Patent Agent.
COMPLETE SPECIFICATION.
New or Improved, Starting, Stopping, and Reversing Gear for
Machinery Driven by Gas or Vapour Engines.
I, PETER BURT of Henrietta Street, Glasgow, Lanarkshire, Scotland, 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 a new or improved arrangement or combination of

page_text: mechanism for engaging and disengaging the connection between the driving shaft
of gas engines and the machinery which it drives, and is capable of reversing the
direction of motion and varying the speed of driven shaft; the engine shaft
meanwhile running steadily in one direction. It is specially applicable for use with
gas engines when used for driving road cars, marine propellers, hoists or other such
machinery requiring frequent starting, stopping or varying of motion.
In the accompanying drawing Fig. 1 is a sectional elevation of the mechanism
looking on shaft a and face of disc d and Fig. 2 is a plan of the mechanism as applied
to a locomotive car.
On the frame t of car is placed the motor engine and journals (not shown)
supporting the driving shaft a revolving at an approximately uniform speed.
The shaft a is fitted with a feather (not shown) and has mounted thereon two
frictional driving wheels b. c, which revolve with and are capable of being
slid along said shaft a from and opposite the face of discs d. e. by means of
trunnioned collar clutches f. g. in end of arms h. i. on shafts j. k. operated by
handles l. m. In lieu of handles l. m. the shafts j. k. may preferably each have a
toothed sector gearing in a worm on operating shafts (not shown) so as to retain the
wheels b. c. in set position. At right angles to driving shaft a are mounted the
driven shafts n. o. in their respective bearings p. g. on frame t. On the inner end of
shafts n. o. are fixed and revolve therewith the discs d. e opposite the face of which
either of the driving wheels b. c. may be brought and kept by their respective
handles l. m. or their sectors and worms as before set forth. The shafts n. o. may
be provided with adjustable springs or other equivalent devices (not shown) to
press them towards the shaft a, so as to cause the face of discs d. e. to bear against
the wheel or c in action and give good frictional contact therewith and so lessen
slipping between driving wheel and discs. As the two driven shafts n. o. revolve
in opposite directions there is mounted on frame t another shaft having a pinion
fixed thereon as indicated by dotted circle r. Fig. 1 into which pinion gears
another pinion s on shaft o. The shaft n and pinion shaft thus revolve in same
direction and are respectively fitted with a chain wheel u. u¹ on which respectively
work the driving chains v. v gearing into and driving in same direction the chain
wheels w. w¹ on driven axles z. xl. The chains v. v; chain wheels u. u¹; w. w¹ ;
and pinions r. s. are indicated on Fig. 7 by dotted lines.
Assuming the driving shaft a to be uniformly revolving in direction indicated by
arrows on wheels b. c. the wheel c being out of contact with discs d. e. and wheel b
in contact therewith as shown, said discs will be revolved in directions shown by
arrows at a speed relative to the position of wheel 6 thereto; the speed of shafts n. o
being highest when either driving wheel b. or c. is near the centre of discs, and
lowest when at outer edge of face of discs; the direction of motion of parts when
wheel b is working discs d. e. being indicated by arrows. To stop the motion of
driven parts without stopping engine the wheel & is pushed outwards by the handle
from off the face of discs which thus stop, the driving shaft a still revolving. To
reverse the motion of driven mechanism the wheel b. being out of gear with discs d. e.
the wheel by means of the handle m is now pushed inwards between the faces of
discs d. e. and by frictional contact therewith drives them round in opposite
directions to that indicated by arrows the speed of discs depending on the position
of wheel c on face of discs. It is preferred to have two driven discs, as hereinbefore
set forth, one on each side of driving wheel so as to equalise the strain on shaft a;
but one of the discs may be dispensed with and if desired the shaft a may have a
bearing opposite centre of disc, or it may be strengthened to prevent bending The
clutches f. g. could be put on outside of wheels b. c. to allow room for a centre bearing
for shaft a.
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―
Let
In
45
starting
stanning
or raversing
cear for machinery driven be pas

page_text: engines, the combination of a driving shaft a having adjustable sliding driving
wheels b. c. thereon, with one or two driven discs, substantially as and for the
purposes set forth and shown.
2nd. In a locomotive car driven by gas engines, the arrangement and combination
of mechanism consisting of the improved gear, chain wheels and chains; all
substantially as hereinbefore described and shown.
Dated this 27th day of September 1892.
DAVID F. MASON,
Glasgow, Patent Agent.