Year: 1886

page_text: Date of Application, 3rd Aug., 1886.
Complete Left, 22nd Apr., 1887.
Complete Accepted, 24th May, 1887.
We HENRY CHERRY of No. 31 Wills Street Aston in the County of Warwick
Mechanical Engineer and GEORGE TANGYE of Cornwall Works Soho in the County of
Stafford Manufacturer do hereby declare the nature of this Invention to be as
follows:
:-
The said invention consists in so constructing safety hooks that the strain on the
hook causes an arm to swivel on an axis and engage with the nose of the hook in
such a manner as to prevent the hook from bending open and at the same time prevent
the chain rope or attachment to the load from slipping off the hook.
In the following description of the mechanism employed with this object the hook
is supposed to be used in lifting a weight vertically.
The arm may swivel on a horizontal or vertical axis. In the first case it is
preferred to form the arm with a jaw to receive the upper end of the hook the
connection being made by a horizontal pin. The lower end of the arm has a pin or
projection formed on it which engages with an eye formed in the nose of the hook or
the reverse that is the eye may be formed in the arm and the projection on the nose of
the hook.
In the second case (in which the axis on which the arm turns is vertical) the upper
end of the arm passes through a socket formed in the upper end of the hook. An
inclined groove is cut in the upper end of the arm and the end of a pin screwed into
the socket of the hook enters this groove. The lower end of the arm is formed with a
projection or eye as in the first case to engage with the nose of the hook. In each
case the chain or pulley block to which the hook is attached is secured to the upper
part of the arm and the effect is that when the pull comes on the hook the arm turns
and engages with the nose of the hook and materially strengthens the same while it
also prevents the chain or other means of attachment of the load from slipping off the
hook.
Dated th: Th: 11.
A
1000
W. T. WHITEMAN,
Agent for the Applicants.

page_text: Improvements in Safety Hooks.
We HENRY CHERRY of No. 31 Wills Street Aston in the County of Warwick
Mechanical Engineer and GEORGE TANGYE of Cornwall Works Soho in the County of
Stafford Manufacturer do hereby declare the nature of the said Invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :—
The said invention consists in so constructing safety hooks that the strain on the
hook causes an arm to swivel on an axis and engage with the nose of the hook in such
a manner as to prevent the hook from bending open and at the same time prevent the
chain, rope or attachment to the load from slipping off the hook.
In the following description of the mechanism employed with this object the hook is
supposed to be used in lifting a weight vertically.
The arm may swivel on a horizontal or vertical axis. In the first case it is
preferred to form the arm with a jaw to receive the upper end of the hook the
connection being made by a horizontal pin. The lower end of the arm has a pin or
projection formed on it which engages with an eye formed in the nose of the hook or
the reverse; that is, the eye may be formed in the arm and the projection on the nose
of the hook.
An
In the second case (in which the axis on which the arm turns is vertical) the upper
end of the arm passes through a socket formed in the upper end of the hook.
inclined groove is cut in the upper end of the arin and the end of a pin screwed into
the socket of the hook enters this groove. The lower end of the arm is formed with a
projection or eye as in the first case to engage with the nose of the hook. In each
case the chain or pulley block to which the hook is attached is secured to the upper
part of the arm and the effect is that when the pull comes on the hook the arm turns
and engages with the nose of the hook and materially strengthens the same while it
also prevents the chain or other means of attachment of the load from slipping off
the hook.
We will now proceed to describe with reference to the accompanying Drawings the
manner in which the said Invention is to be performed.
Figures 1 and 2 represent elevations taken at right angles to one another of a safety
hook in which the swivelling arm turns on a horizontal axis, the said hook being
represented closed; that is, with the swivelling arm engaged with the nose of the hook;
Figure 3 represents the same view as Figure 2 exhibiting the hook open for hooking
the load to or unhooking it from the said hook.
The same letters of reference indicate the same parts in Figures 1. 2 and 3.
a is the hook and the swivelling arm. The said swivelling arm b is furnished at
its upper part with a double jaw c and d. To the lower jaw c the upper end of the
hook a is connected by the horizontal pin or axis e on which it can turn independently
of the swivelling arm b. In the upper jaw d of the swivelling arm the attachment f
for the chain or pulley block works the double jaw being secured to the said
attachment by the horizontal pin or axis g on which the said swivelling arm can
turn or have a side motion; that is, motion in a plane at right angles to that in which

page_text: the hook a is situated (see Figure 3). On the lower end of the swivelling arm is a
pin or projection 62 at right angles to the said arm and in the nose of the hook a is an
eye h in which the said pin or projection 62 may be engaged. By moving aside the
swivelling armb on its axis g the pin or projection is withdrawn from the eye h in
the nose of the hook and the said arm 6 takes the position represented in Figure 3
carrying with it the hook a which swivels on the independent axis e and brings the
said hook out of the line of the attachment to which the upper end of the arm b is
jointed as represented in the said Figure 3. The hook being thus open and the chain
or pulley block being connected to the attachment f the load is hooked to the hook a
in the usual way.
When the strain is put on the hook a it tends to bring the said hook into the line of
the attachment f. The arm b is thereby made to swivel on its axis and its pin or
projection b² engages with the oye h in the hook a as represented in Figures 1 and 2.
The hook is thereby strengthened by bridging the gap or opening in the hook and the
chain or other means of attachment of the load is prevented from slipping off the
hook.
Figure 4 represents partly in section and partly in side elevation closed and
Figure 5 in end elevation partly in section open, a safety hook constructed according
to this invention in which the axis of the arm is vertical: bis the arm having a pin or
projection b at its bottom for engaging with the eye h in the nose of the hook a as in the
arrangement first described; 6 is the vertical axis forming a prolongation of the
arm b, the said axis passing through the socket a made in the upper end of
the hook a. The upper end of the vertical axis 63 is carried by the attachment ƒ to
which the chain or pulley block is secured. In the axis 63 is an inclined groove i in
which the end of the screw pin & screwed into the socket a² of the hook enters as
represented.
When the hook a is open the end of the screw pin k is at the top of the helical
groove in the axis 63 and the eye of the hook a has been turned away from the pin
or projection of the arm 6 and the hook raised, the parts occupying the positions
represented in Figure 5.
When the load is placed on the open hook a the action is essentially the same as in
the first described arrangement; that is, the strain on the hook causes it to descend
and rotate upon the axis ³ so as to bring the eye h of the hook upon the pin or
projection of the arm b, thereby closing the hook and preventing the load slipping
off the said hook.
Having now particularly described and ascertained the nature of this invention and
the manner in which the same is to be performed we declare that we claim as the said
invention of "Improvements in safety hooks,"
First The combination with the hook a of the swivelling arm band parts connected
with it, the several parts being arranged and operating substantially in the manner
herein before described and represented in Figures 1, 2 and 3 of the accompanying
Drawings whereby when the load is placed upon the hook the strain causes the arin to
swivel on its axis and engage with the nose of the hook for the purposes herein before
described.
Secondly-The arrangement or combination of parts herein before described and
illustrated in Figures 4 and 5 of the accompanying Drawings in which a vertical axis
is used and the head of the hook is connected to the said axis by a pin on the said head
engaging in a helical groove in the said axis.