New or Improved Mechanism for Applying a Skid to the Wheels of Drags, Carts, and other Vehicles.
Year: 1892

page_text: Late of Application. 26th Aug., 1892-Accepted, 1st Oct., 1892
OMILELE SPECIFICATION.
New or Improved Mechanism for Applying a Skid to the Wheels of
Drags, Carts, and other Vehicles.
I, WALTER HILL of 248 Oxford Street London; Gentleman 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 a new or improved mechanism for applying a skid to the
wheels of drags, carts, and other vehicles.
In the accompanying drawings
Figure 1 is a side clevation of a drag furnished with my improved mechanism,
Figure 2 being an underside view of the same,
Figure 3 is a plan of the detached mechanism and corresponding wheel and
axle,
Figures 4 and 5 are details.
Like letters of reference indicate corresponding parts throughout the drawings.
According to my invention I fix to the axle of the wheel W a fork/carrying at
its front end the arm of the skid a pivoted between the two prongs of this fork.
To the top of this arm is fixed one end of the chain which passes over the
pulleys and through tlie guide d secured to the underside of the cart in order to
be wound on the drum i loosely mounted on the axis m. is a hand lever pivoted
at g to an arm g connected to the rod e which bears at its other end against the
weighted pawl q pivoted on a lower extension of the frame r and gearing with the
ratchet wheel p mounted upon a prolongation of the drum i. The axis m is
supported in suitable bearings by the frame secured to the axle A and carrying a
toothed wheel o' keyed thereon. This wheel o' gears with the spur wheel o mounted
on the hub of the cart wheel W. The drum iis furnished with a sleeve k having a
serrated edge and engaging, when the chain is wound on the drum i with a similar
sleeve mounted on a square part of the axis m for the purpose of communicating
the rotary motion of the wheel W to the said drum; these sleeves k and I forming
a clutch gear.
The lower arm of a crank lever j is pivoted to the sleeve its extremity being
attached to one end of a spiral spring the other end of which is secured to the
axle A; the other end of the lever has the shape shown in Figure 4 being slotted
to allow the passage of the chain through the same, this chain being furnished at
a given point with an enlargement or ring which stops the same when sufficiently
wound up being too large to pass through the lever j.
The operation of this mechanism is as follows:- When descending an incline the
driver moves the hand lever & in one direction and pushes the rod e against one end
of the pawl (Figure 5) thus releasing the ratchet wheel P
which enables the chain
to be unwound from the drum thus bringing the fork with the skid a from the
position shown in full lines in Figure 1 to that shown in dotted lines in the same
figure, that is to say under the cart wheel W; at the same time the projection e¹
bears on the side of the lever j and prevents the latter from moving. When the
skid a is required to be withdrawn from the wheel W the hand lever is moved in a
contrary direction to the former the rod e is drawn and the pawl 9 is allowed to
gear with the ratchet wheel p thus preventing the drum.from turning in the former
direction but allowing the same to turn freely in the other, and as the projection e¹
is now withdrawn from the lever j the latter moves to one side under the action of
the spiral spring n and brings the sleeve in gear with the sleeve k when a rotary
motion is imparted to the drum i which now winds up the chain ready for the next
application of the skid to the wheel until the enlargement & comes to bear upon

page_text: the lever thus preventing any further winding of the chain and at the same time
depressing the horizontal arni of the said leverj so as to disconnect the sleeve
from the sleeve k, when the mechanism resumes its normal position.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
The improved mechanism enabling a driver to apply a skid to the wheel of a
cart, drag, or other vehicle and withdraw it therefrom constructed arranged and
operating substantially as herein described and shown.
Dated hot day of dust 1802
F. G. CASSELL,
Of Cassell & Co.,
22, Glasshouse Street, Regent Street, W., Agent for the Applicant.