An Improved Combined Starting, Stopping, and Reversing Gear for Hoists.
Year: 1895

page_text: Date of Application, 30th July, 1895
Complete Specification Left, 7th Apr., 1896-Accepted, 30th July, 1896
PROVISIONAL SPECIFICATION.
An Improved Combined Starting, Stopping, and Reversing Gear for
Hoists.
I, ARTHUR DUDLEY DOBSON, of Lava Street, Warrnambool, in the Colony of
Victoria, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved combined starting, stopping and reversing
gear for hoists of the type which are designed mainly for lifting light loads such
as those used in butter factories and creameries although the gears may also be
applied to hoists used for other purposes.
The gears consist of a connected two faced friction clutch and brake drum and
two rope pulleys all of which are arranged on the hoist shaft combined with a
suitably supported idle pulley and a brake and clutch controlling lever. The
hoisting drum or sheave is also usually arranged on the aforesaid shaft and may
either be for rope or chain and be furnished with pawls for holding the shaft in
position. Each of the two rope pulleys have half of the conical friction clutch
affixed on their side and they run loose on the hoist shaft they being retained in
position by fixed collars whilst they are situated at such a distance apart as to
admit of a double ended conical and connected friction clutch working clear of
them thereon. The body or lesser diameter between the clutches forms the brake
drum and such clutch brake drum slides on a feather projecting from shaft.
Each half of clutch upon the pulleys has its inner conical surface coated with
leather in order that the clutch may grip firmly when so placed. The idle pulley
is mounted on a fiame the bearings of which are capable of adjustment in order
that when so desired the driving ope helt may be tightened which rope passes
around the idle pulley and over both rope pulleys consequently the latter rtate
in opposite directions, said rope belt has motion imparted to it in any ordinary
manner. Supported in suitable bearings under the brake drum is a short trans-
verse shaft upon which the upper forked end of the clutch lever is centred and
the upper ends of said fork have friction rollers upon them which just fit between
the back surfaces of the clutches. The lower length of the clutch lever is tubular
and terminates in a pivotted handle whilst within the tube is a rod the upper end
of which is attached by links to a brake strap which passes around aforesaid
brake drum said rod being drawn downwards in order that the brake strap will
grip the drum by a coiled spring secured to and arranged within the tubular lever.
The lower pivotted handle has a cross head on it which acts on a similar cross
piece formed on end of brake rod so that immediately the lever is pulled to bring
one face of clutch into gear with its driving rope pulley to rotate the hoist shaft
in the desired direction, the brake rod is also lifted to release the brake from
drum so that it may revolve freely. By pushing the lever in the opposite
direction the clutch engages the opposite pulley and the hoist shaft will be revolved
in the opposite direction.
Dated this 30th day of Lule 1805

page_text: COMPLETE SPECIFICATION.
An Improved Combined Starting, Stopping, and Reversing Gear for
Hoists.
I, ARTHUR DUDLEY DOBSON, of Lava Street, Warrnambool, in the Colony of
Victoria, 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 an improved combined starting, stopping and reversing
gear for hoists and other purposes and although it has been designed mainly for
lifting light loads such as those met with in butter factories and creameries, the
gears may also be applied to hoists used for lifting heavy loads or to such as
winding or steering gears.
In order that my invention may be well understood I will now proceed to
describe it aided by a reference to the attached drawings in which,―
Fig. 1 is a front elevation.
Fig. 2 a sectional side elevation looking from line xx of Fig. 1, and
Fig. 3 a plan of my improved gears as applied to a hoist.
Fig. 4 is a half side elevation and a half central vertical section of the sliding
part of clutch and its brake drum.
Fig. 5 a central vertical section of the other half of clutch and its attached rope
pulley.
Fig. 6 a detail side view of the upper part of the brake rod, and
Fig. 7 is a plan shewing the pulleys driven by a belt in place of a rope.
The gears consist of a connected two faced friction clutch and brake drum B
and two rope pulleys A and A 1 all of which are arranged on the hoist shaft M
combined with a suitably supported idle rope pulley D and a brake F and clutch
controlling lever P. The hoisting drum or sheave L is shewn as usually arranged
on aforesaid shaft M and it may either be for rope or chain and be furnished with
pawls for holding the shaft in position. Each of said rope pulleys A-A 1 have
half of the conical friction clutch marked E and E 1 respectively formed or affixed
on their side and said pulleys run loose on the hoist shaft M they being retained
in position by fixed collars N-N, whilst the pulleys are situated at such a distance
apart as to admit of the double ended conical and connected friction clutch B
working clear of them on shaft M. The body b or lesser diameter between the
conical faced clutches 61 and 62 forms the brake drum and such clutch brake
drum slides on a feather M 1 projecting from shaft M. Each of the half clutches E
and E 1 upon the pulleys A and A 1 respectively has its inuer conical surface lined
or coated with leather e in order that the sliding half of clutch may grip firmly
when placed in gear. The idle pulley D is centred on a pin carried by a trans-
verse rock bar D 1 mounted in bearings D 3 carried by a frame D 2 said bearings
being adjustable in order that when so desired the driving rope or belt O may be
tightened. To adjust the bearings D 3 the frame bolts d are released and the
bearings are shifted back or forward as the case may be and when at the desired
position they are again secured by the bolts d.
The driving rope O passes around the idle pulley D and over both rope
pulleys A and AI and consequently said pulleys rotate in opposite directions.
The rope belt O has motion imparted to it in any ordinary manner. Supported
in bracket bearings Q1 under the brake drum B is a short transverse shaft Qupon
which the upper forked end R of the clutch lever P is centred and the upper
ends of said fork have small friction rollers R 1 upon them which just fit between
the back surfaces of the clutches 61-62. The lower length of the clutch
lever P is tubular and terminates in a pivotted handle K whilst within the tube is
a rod F1 the upper end of which is attached by links F2-F 2 to the brake

page_text: strap F which passes around aforesaid brake drum b said rod F1 being drivn
downwards in order that the brake strap F will grip the drum by a coiled
spring F 3 secured and arranged within the tubular lever P. Or one en only of
brake strap F is secured to the link F 2, its other end being secured as shewn in
dotted lines in Fig. 2 to the shaft Q. The lower pivotted handle K has a cross
head K1 on it which acts on a similar cross piece F4 formed on lower end of
brake rod F1 so that immediately the lever is pulled by handle K to bring one
face of sliding clutch into gear with the half clutch on driving rope pulley to
rotate the hoist shaft in the desired direction the brake rod F 1 is also lifted to
release the brake F from drum b so that it may revolve freely. By pushing the
lever in the opposite direction the clutch engages the opposite pulley and the hoist
shaft will be revolved in the opposite direction.
In a modified arrangement as shewn in Fig. 7 the pulleys A and A 1 are shewn
driven by belts from pulleys T and T 1 on a shaft T 2, one of said belts being
crossed to give the pulleys a reverse motion, also said pulleys A and AI may be
substituted by loose spur wheels which may be driven in any well known manner
to give opposite motions to each. Further for winding or steering gears the
wheels carrying the loose parts of the clutch may be driven by independent
engines and the winding being then controlled by my starting, stopping and
reversing gear would have the advantage that the attendant must remain at his
post to operate the lever.
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. My improved starting, stopping and reversing gear consisting of the clutch
brake drum marked B, 661 and 62 and the pulleys A A 1, with their attached
conical faced clutches EE1 respectively, assembled on shaft M, combined with
the adjustably supported idle pulley D and the combined clutch and brake
lever F-P-K all assembled and arranged substantially as herein described and
as illustrated in my drawings.
2. In a starting, stopping and reversing gear, wheels or pulleys as AA1,
arranged to rotate reversely upon a shaft as M and having a clutch as B between
them thereon which is capable of clutching the wheels or the pulleys and the
latter combined with a suitably supported idle pulley as D when driven by a rope
belt substantially as and for the purpose herein described and as illustrated in my
drawings.
3. In a starting, stopping and reversing gear a tubular lever as P suitably
supported and provided at its upper end and with a clutch fork R and at its lower
end with a pivotted handle K combined with a rod as F1 the upper end of which
is attached to a brake strap as F the lower end of rod being furnished with a
cross bar F4 which is capable of being raised by a similar bar K¹ on the pivotted
handle and such brake being drawn upon, to grip the clutch by a spiral spring
substantially as herein described and as illustrated in my drawings.
Dated this 4th day of A nuil 1906
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.