Improvements in or applicable to Fluid Motors.
Year: 1891

page_text: Date of Application, 24th Aug., 1891
Complete Specification Left, 24th June, 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Fluid Motors.
I, WALTER COLE, of No. 39. Coleman Street, in the City of London, Architect,
do hereby declare the nature of this invention to be as follows:-
My invention relates to an arrangement of mechanism applicable to single-acting
Huid motors having oscillating pistons whereby the piston is prevented from stopping
at the dead point.
In carrying out my invention I employ a rocking lever one end of which is
connected by a cord, link, chain or other suitable means to a projection on the
oscillating shaft of the piston the other end being arranged to be automatically
actuated by a lever or other suitable device connected with the cut off of the fluid
supply pipe.
By this construction whenever the fluid supply is cut off the oscillating shaft
will be pulled into its farthermost position on one or the other side of the piston
chamber thereby insuring its assuming a starting position.
Dated the 24th day of August 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or applicable to Fluid Motors.
I, WALTER COLE, of No. 29, Clyde Road, Wallington, in the County of Surrey,
Architect, 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:-
My invention relates to an arrangement of mechanism applicable to single-acting
fluid motors having oscillating pistons whereby the piston is prevented from stopping
at the dead point.
In carrying out my invention I employ a rocking lever one end of which is
adapted by suitable means to act upon a projection on the oscillating shaft of the
piston the said lever being connected with the cut off of the fluid supply pipe.
To enable my invention to be fully understood I will describe how it can be
carried into practice by reference to the accompanying drawing, in which
Figure 1 is a front elevation of a sheep-shear operated by a fluid motor
embodying my improvements, the covering plate of the sheep-shear and motor being
removed.
Figure 2 is a side elevation of the same partly in section.
Similar letters in both the figures indicate similar parts.
a is the casing of the sheep-shear driven by the fluid motor; b is the fixed cutter,
c the working cutter, d the guide thereof, e the fluid inlet tube, and f the handle.
is the chamber in which the oscillating piston works; h the piston shaft, i the
lever which works the movable cutter c, the cock of the fluid-inlet pipe e, and
k the hook to receive one of the operator's fingers all of which parts are of similar
construction to those described in my Patent No. 17016 of 1890.
1, m indicate the rocking lever which I employ for preventing the piston from
stopping at the dead point. This lever is fixed to the plug of the cock or valvej
which controls the supply of fluid to the motor; the arm m of the lever extends
outside the casing a through a slot therein and is adapted to be operated by the
fore-finger of the operator so as to open the cock j, and the arm of the lever is
ID 77

page_text: adapted to act upon the tail n of a forked lever o, which is mounted on the piston-
shaft and communicates the to-and-fro movement of the piston to the lever i
which works the movable cutter c.
The lever 1, m is automatically moved to shut off the fluid-supply immediately
the operator removes the pressure of his finger from the arm m thereof through the
medium of a coil-spring p.
By this construction whenever the operator releases the arm m of the lever and
the fluid-supply is thereby cut off the forked lever o is automatically moved over
into the position shewn in Figure 1 in which position the piston will be on one side
of the piston chamber g in a proper position to ensure its re-starting when the
arm m of the lever is pulled down into the position shewn by the dotted lines in
Figure 1 and the arm 7 is consequently moved out of the way of the tail n of the
forked lever o.
I connect the cutters b and c to the guided by means of what I term a spring
adjusting screw which consists of a stud q, Figure 2, having a square head located
in a square countersink in the fixed cutter 6:, a spring rattached to the stud
and to a nut s beneath the guide d: and a screw t Figures 1 and 2 working in the
nuts and having a head provided on its under surface with serrations engaging
with serrations on the outer surface of the guide so that the screw t will be securely
held by the serrations in any position to which it may be adjusted.
Although I have described and shewn my improvements by way of example
applied to a fluid motor adapted to operate a sheep-shear it will be obvious that
they can be applied to fluid motors having oscillating pistons, when adapted to
drive various other apparatuses such as horse-clippers, saws and the like.
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. In a fluid motor having an oscillating piston, a rocking lever connected with
the cut off of the fluid supply pipe and adapted to act upon a projection on the
oscillating shaft of the piston, substantially as and for the purpose hereinbefore
.described.
2. In a fluid motor such as is herein described, the combination with a lever
such as o fixed on the piston shaft and provided with a tail n, of a starting lever
having an arm for the purpose of preventing the piston from stopping at the dead
point, substantially as set forth.
3. The improved fluid motor hereinbefore described and illustrated in the
accompanying drawing.
Dated this 24th day of June 1899
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.