Improvements in connection with Safety Links for the Prevention of Accidents in Overwinding.
Year: 1891

page_text: Date of Application, 30th Sept., 1891
Complete Specification Left, 30th June, 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in connection with Safety Links for the Prevention
of Accidents in Overwinding.
ALFRED WEST, The Rydings, Birstall, near Leeds in the County of York
Colliery Manager etc. do hereby declare the nature of this invention to be as
follows:-
:-
By making the catch plate on the top of beams in a conical form instead of flat
as heretofore which gives the links a more easy and sure entrance into the conical
catch plate also adding to the plate a much greater strength and forming easy
inclines for the catches to slide upon.
The catches in links being made to a corresponding angle.
COMPLETE SPECIFICATION.
Improvements in connection with Safety Links for the Prevention
of Accidents in Overwinding.
☐ I, ALFRED WEST, of "The Rydings," Birstall, near Leeds, in the County of
York, Colliery Manager, 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 has reference to an improved construction of catch plate for use
in conjunction with safety links or hooks employed to prevent accidents from over-
winding of cages, boists and lifts in mines, warehouses, hotels and other buildings,
my object in such invention being to afford a sure and easy entrance of the safety
links to the catch plate and to add to the strength of said plate so that liability to
breakage and displacement will be reduced.
In carrying out my invention I construct the catch plate in one or two pieces the
lower portion being dished out or cast with a conical mouth and bolted to the head
gear in an inverted position, whilst the upper portion is made flat and secured by
the same bolts to the head gear so as to cover or protect the upper edges of the
conical mouth; or a metal ring or washer may be secured to the top of the conical
mouth to strengthen same. The sides of the conical mouth form opposing inclines
or surfaces for operating the catches of the safety links.
For the purpose of more fully explaining my invention, reference is hereinafter
had to the annexed sheet of drawings illustrative thereof.
Fig. 1 is section of my improved catch plate shewing a safety link therein in
working order preparatory to being operated to detach the rope shackle:
Fig. 2 is a similar section shewing the link, after an overwind, suspended from
the catch plate and the rope shackle detached.
Fig. 3 is section of a modification of the catch plate.
Referring to Figs. 1 and 2, a represents a dished metal inverted cup which
forms the conical mouth of the catch plate, supported between the beams b and c
of the head gear and provided at the bottom with a flange d adapted to fit against
the undersides of the beams b and c. The upper edges of the conical mouth are
covered or protected by a flat plate a¹ resting on the top of the beams b and c and
the two parts are bolted to the said beams by bolts e. The plate a' is made of
tougher metal than the conical mouth a so as to better withstand wear and tear,
[Paine Rd T

page_text: and the concussion and pressure of suspending the cage in case of an overwind, the
said conical mouth being preferably cast in steel.
The conical mouth of the catch plate gives ample room or allowance for any
oscillation or swaying movement of the safety link whose entry into the said mouth
is therefore rendered certain and easy and the construction of the catch plate as
described greatly adds to its strength, durability, and freedom from liability to
displacement or collapse.
When overwinding, the safety link is drawn into the conical mouth a as shewn
in Fig. 1, and as it passes upward the inclined or wedge shaped feet ƒ and g of the
sliding catches f' and 9' engage with the inclined sides of the conical mouth a which
causes said feet to be forced into the box or casing / whilst the catches f' and g
are forced outwards, in doing which the rope shackle i is liberated. The link is
prevented from falling downwards by the catches f' and ' which engage with the
plate a (as shewn in Fig. 2) by which means the link and the cage, which is
attached or coupled to the shackle k, are suspended until the parts are again
attached and the link liberated.
At Fig. 31 shew a modification in the arrangement and construction of the catch
plate which in some cases may be preferred, this consisting in placing the conical
mouthed catch plate a on the top of the beams b, c, instead of between them as
shewn in Figs. 1 and 2. The plate is secured to the beams by bolts e. The upper
end of the catch plate is provided with a shoulder / over which is placed a wrought
iron or other suitable tough metal ring or washer m, this being first heated so that
on cooling it will contract and secure itself to the shoulder.
The inclined sides of the conical mouthed catch plate form opposing inclines or
curved surfaces to the feet ƒ and g and are adapted to operate same gradually and
with certainty so that the catches f, g', are forced outward into position for
engaging with the catch plate immediately they are clear of the opening n in the
plate a¹.
Having now particularly described my invention, and in what manner the same
is to be performed, I declare that what I claim is :-
Firstly. In safety links for preventing overwinding the conical mouthed catch
plate a and strengthening plate or washer arranged and constructed in the manner
and for the purposes substantially as herein shewn and described.
Secondly. The combination, with a safety link comprising sliding catches ƒ"¹, g₁₂
having inclined feet f, g, and device for releasing the rope shackle, of the conical
mouthed catch plate arranged in the manner and for purposes substantially as
shewn and described.
Dated this 29th day of June 1892.
TASKER & CROSSLEY,
Huddersfield, Agents.