Year: 1891

page_text: that they close upon and grip the rope, chain, or rod by the very strain or weight
of the said rope, chain, or rod as it passes around or over the periphery of the clip
wheel, and our invention consists in improvements in the construction of the clip
mechanism, so that it shall be effective in action and cheap and simple in fitting
together.
In order that our invention may be the better understood we will now proceed to
describe the same in relation to the drawings hereunto annexed, reference being
had to the letters and figures marked thereon. Like letters refer to like parts in
the various figures.
Figure 1 is a diagrammatic figure showing the rolling surface and rolling circles,
in which A B is the radius of the circle B.H C, and also the diameter of the
rolling circles ADE and A. F G. The dotted circles and lines show a second
position and the letters with dashes show the displacement of the various points in
that position.
Figure 2 is a view of the pulley rim in section showing the clip device
in full.
Figures 3 and 4 are plan and side elevation respectively, one side of the pulley
rim being removed.
Our clip mechanism consists of two gripping cams a a rolling on a specially
designed surface b on the pulley cheeks c.
As the said rolling cams a a descend under the pressure of the straining rope,
chain or rod, it is necessary that the points of the cams where they touch one
another below the rope d should travel down together without jamming or locking,
whilst the upper parts of the cams a a, in which the rope d, chain or rod lies,
approach one another to grip the said rope, chain or rod by the same downward
movement.
This is effected by striking the seating or surface 6 in the cheeks c of the pulley,
with a radius double of that of the cam surfaces a a which roll in these seatings as
shown diagrammatically in Figure 1. The point of contact A of the cams
(Figures 1 and 2) is placed upon the periphery of the circle forming the cam
rolling surface, and the said points will therefore travel in a rectilineal line
together, without tending to jam or lock.
The upper parts a¹ a¹ of the rolling cams a a forming the gripping jaws, will
however move towards one another with great mechanical force, and grip the
rope d, chain or rod which lies between them.
A suitable spring e is provided between extended wings f arranged upon the
said cams a or the spring may be arranged with equivalent effect between the two
approaching faces of the cams so as to offer a recoil to the closing of the clips, and
thus tend to keep the cams a normally open when the gripping pressure is
removed.
Or, obviously, the movement of the approaching faces a¹ or extensions of of the
cams c may be caused to react upon a sliding plate held up by a spring with
the same recoiling effect.
Our improved clip is dropped into place in the periphery of the pulley, and we
fix a bolt g transversely through the cheeks of the wheel and through a slot / in
some convenient part of each of the cams, preferaby through the extensions upon
which bolt g the spring e is threaded, or, we may apply hold fast pins or studs, in
any convenient way, to prevent the clips from dropping or being thrown out of
place, by centrifugal force, as the pulley revolves.
The clip device is provided with recesses k on each side which engage with
projections or lugs arranged on the rims c c of the pulley, through which the
driving effort of the rope is transmitted to the wheel or vice versa.
The extension on one clip a is made with double joined arms with a space
between them, while the extension f on the other clip a is made with only one arm
which is arranged to pass between the double arms of the first clip so that the
direction of the spring action is at right angles to the line of junction of the two
clips a a.

page_text: Date of Application, 17th Sept., 1891"
Complete Specification Left, 17th June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
An Improved 'Clip Pulley!
We, CLAUDE WILLIAM ATKINSON and LLEWELYN BIRCHALL ATKINSON,
both of Woodfield Works, Harrow Road, in the County of London, Engineers, do
hereby declare the nature of this invention to, be as follows:-
:-
Our invention relates to pulleys in which the periphery is fitted with clips so that
they close upon, & grip the rope, chain, or rod, by the very strain or weight of the
said rope, chain, or rod, as it passes around or over the periphery of the clip, wheel,,
and our invention consists in improvements in the construction of the clip
mechanism, so that it shall be effective in action, and cheap and simple in fitting
together.
Our clip mechanism consists of two gripping, cams, rolling on specially designed.
surface, on the pulley cheeks.
As the said rolling:cams descend. under the pressure of the straining rope, chain,
or rod, it is necessary that the points of the cams, where they touch one another
below the rope, should travel down together without jamming or locking, whilst the
upper parts of the cams, in which the rope, chain, or rod lies, approach one another
to grip the said rope, chain, or..rod, by the same downward movement.
I
This is effected by striking the seatings, in the cheeks of the pulley, with a radius
double of that of. the cam surfaces which roll in these seatings. The point. of
contact of the cams is placed upon the periphery of the circle forming the cam
rolling surface, and the said points will therefore travel in a rectilineal line together,
without tending to jam or lock.
The upper parts of the rolling cams, forming the gripping jaws, will however
move towards one another..with. great mechanical force, and grip the rope, chain, or
rod, which lies between them...
A suitable spring is provided between two approaching faces. of the cams, or
between extended wings from the said cams, offering a recoil to the closing of the
clips, and thus tending to, keep the cams normally open when the gripping. pressure
is removed.
Onobviously the movement of the. approaching faces or extensions of the cams
may be caused to re-act upon.a..sliding plate, held up by a spring with the same
recoiling effect.
As our improved clip, may be dropped into place in the periphery of the pulley,
we fix a bolt transversely through the cheeks of the wheel and through a slot in
some.convenient parts. of the cams, or apply hold-fast pins or studs, in any con-
venient way, to prevent the clips from. dropping, or being thrown. out of place, by
centrifugal force, as the pulley revolves.
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for.the Applicants.
:
COMPLETE SPECIFICATION..
An Improved: Clip Pulley.
We, CLAUDE WILLIAM ATKINSON, and LLEWELYN BIRCHALL ATKINSON,
both of Woodfield Works, Harrow Road, in the County of London; Engineers, 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 pulleys in which the periphery is fitted with clips so.

page_text: 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 :-
1st. A clip pulley having a circular surface or surfaces arranged upon its
periphery in combination with one or more clipping devices each consisting of a
pair of clips having roller surfaces of half the radius of the said circular surface
and adapted to roll thereon, and also having gripping jaws to grip the rope, chain
or rod by means of the strain transmitted thereby, means for maintaining the said
clips in an open position, when not stressed by the strain; and means to produce
driving effect between the clipping device and the pulley.
2nd. In such a clip pulley, clips having extended wings or arms in combination.
with a spring reacting on the said wings to maintain them in an open position when
not stressed by strain, substantially as described.
.
3rd. The arrangement and construction of a clip pulley substantially as described.
and illustrated in the accompanying drawings.
Dated this 17th day of June 1892.
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicants.