Year: 1887

page_text: Date of Application, 1st July, 1887
Complete Left, 31st Mar., 1888
Complete Accepted, 18th May, 1888
We, EDWARD THOMAS CLEATHERO, Engineer, and JOHN FYFE STEWART, Engineer,
both of No. 26 Mark Lane in the City of London, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to safety apparatus for preventing the suspended cage car or
platform of a lift &c. from falling in the event of the winding rope, chain &c.
breaking
For this purpose we employ toothed or serrated sliding blocks so arranged on the
cage that on the breaking of the rope &c. they are moved upon guides in a more or
less inclined or oblique direction so as to bring their serrated faces in contact with one
or more fixed vertical guide posts or runners, whereupon the downward pressure of the
cage in tending to drop causes the blocks in sliding upon the inclined guides to
exercise an automatic wedging action whereby they are made to grip the guide
posts or runners firmly and thus prevent the further downward motion of the
cage.
According to one arrangement which we employ for this purpose the blocks are
arranged to slide upon or in guides on a frame, which guides are inclined with their
upper ends toward a vertical guide post, so that on sliding up the guides the
blocks have their serrated faces brought in contact with the post. On the frame
are mounted double ended levers, one end of which is connected to a spring or weight
and by a rod or chain to a cross bar to which the winding rope or chain is attached,
while the other end of the lever bears in an upward direction against a stud on the
block. Thus when the rope breaks the end of the lever connected thereto is free
to follow the downward pull of the spring or weight, causing its other end to
raise the block on its inclined guide sufficiently to bring its serrated surface in
contact with the guide post, and thus offect the automatic gripping action above
described.
ABEL & IMRAY,
Agents for the Applicants.

page_text: Cages, Cars, or Platforms.
EDWARD THOMAS CLEATHERO of 34 Malpas Road Brockley in the County of
Kent Engineer and JoHN FYFE STEWART of 26 Mark Lane London 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:
Our invention relates to safety apparatus for preventing the suspended cage,
car, or platform of a lift &c. from falling in the event of the winding rope, chain &c.
breaking.
For this purpose we employ toothed or serrated sliding blocks so arranged on the
cage that on the breaking of the rope &c. they are moved upon guides in a more or
less inclined or oblique direction so as to bring their serrated faces in contact with one
or more fixed vertical guide posts or runners, whereupon the downward pressure of
the cage in tending to drop causes the blocks in sliding upon the inclined guides to
exercise an automatic wedging action whereby they are made to grip the guide
posts or runners firmly and thus prevent the further downward motion of the
cage.
According to one arrangement which we employ for this purpose the blocks are
arranged to slide upon or in guides on a frame, which guides are inclined with their
upper ends toward a vertical guide post so that on sliding up the guides the blocks
have their serrated faces brought in contact with the post. On the frame are mounted
double ended levers one end of which is connected to a spring or weight and by a rod
or chain to a cross bar to which the winding rope or chain is attached while the other
end of the lever bears in an upward direction against a stud on the block. Thus when
the rope breaks the end of the lever connected thereto is free to follow the downward
pull of the spring or weight causing its other end to raise the block on its inclined
guide sufficiently to bring its serrated surface in contact with the guide post and
thus effect the automatic gripping action above described.
The accompanying drawing shows a side elevation of an elevator or lift cage.
A is a horizontal beam which is carried in the vertical slot A' of the plate or frame B
which is suspended by the rope C. The side arms D D are attached to the beam A.
The connecting rods E. E. are provided with screw end and lock nuts which pass
through the side arms and are adjustable by the nuis F. F. The other end of the
connecting rod is connected to the double lever G. G. and is mounted on the frame-
work H. One end of the double lever is connected to a spring 1: the other end of
the lever supports the toothed or serrated sliding blocks J. J. which are also fixed to
an inclined slide or guide K. This slide or guide is connected to or forms part of the
cage or framework of the cage. L is a cap to prevent the blocks J. J. from falling
away from their proper position. In the position shewn the beam A is at the top of

page_text: the vertical slot. The rope C breaking causes the beam to fall. With the assistance
of the springs the serrated or toothed blocks are thus brought into contact with the
upright guide post M which is thereby gripped and prevents the descent of the cage.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is-
The construction and combination of the parts of the automatic safety apparatus
hereinbefore described and illustrated in the accompanying drawing that is to say the
toothed or serrated blocks fixed in an inclined upward direction in slides or guides,
the double lever, springs, connecting rods, beam and side arms.
EDWARD THOMAS CLEATHERO.
JOHN FYFE STEWART.