Improvements in Hooks for Lifting and Lowering.
Year: 1891

page_text: Date of Application, 6th July, 1891
Complete Specification Left, 6th Apr., 1892-Accepted, 14th May. 1892
PROVISIONAL SPECIFICATION.
Improvements in Hooks for Lifting and Lowering.
ALFRED LANNING Moulsford Wallingford Berks Contractor's Principal Foreman
do hereby declare the nature of this invention to be as follows:-
A double grip spring safety hook for hoisting or lowering heavy or light
weights from 5 cwt. to 20 tons which cannot possibly become unfastened from
any cage, skep, or bucket to which it is attached. (in whatever position it
may be
placed) without the aid of manual strength, the hooks being held together by a
collar, which collar is kept in position by a spring, attached to the shank of the hook,
which spring works through a slot in the collar while being released. The spring
is so arranged as to avoid displacement while in use, thus rendering the double
grip spring safety hook practically undetachable by accident, yet so simple
in its working that it can be manipulated by a boy. It is designed to prevent
accidents in shaft, well sinking, and similar works where men are employed
beneath.
"
Dated this 4th day of July 1891
ALFRED LANNING.
COMPLETE SPECIFICATION.
Improvements in Hooks for Lifting and Lowering.
I, ALFRED LANNING of Moulsford, Wallingford, Berkshire, Contractor's
Principal Foreman 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 certain improvements in hooks for lifting, lowering, and
analogous purposes, and has for its object the production of a device at once simple
and effective in use.
In order that my said invention may be more clearly understood I have appended
the accompanying sheet of drawings in which:
Figure 1 is a front elevation of the device, shewn as closed and Figure 2 a side
elevation thereof.
Figure 3 shows the device in its open position.
Similar letters of reference indicate corresponding parts throughout the
drawings.
aa, is a double set of hooks pivotted together by a pin b. One of said
hooks is preferably rigidly attached to, or forms a part of the shank c. d is a
sliding collar which, when the two hooks are together, is caused to pass over the
upper portion of said hooks, thus preventing them from coming apart. The
interior face of the hooks may be made flat, one hook fitting into the other as
shown in the drawings, so as to make both exterior surfaces lie flush with one
another.
The sliding collar is retained in its position by means of a spring catch e; and
when it is desired to open the hooks, said spring catch is depressed, and the collar d
allowed to slide up the same. A slot may be provided to contain the spring catch
when depressed.
is an ordinary shackle used in connection with the hooks.
I may construct the aforesaid device and its several parts of any suitable metal
or material and I do not confine myself to the size nor to the conformation of said
device or its parts.

page_text: It will be seen that when for instance my above described invention is applied to
the lifting of a heavy weight, and the loop of rope or chain, to which the object to
be lifted is attached, is placed between the hooks when open as in Figure 3, and
then afterwards closed as in Figure 1, there is absolutely no danger of the afore-
said loop or chain slipping or falling out of the hooks, or of said hooks coming
apart.
My invention may be employed for any purpose to which the ordinary single
hooks or clips are applied.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
clain is :
The compound hook, pin, collar, and spring catch substantially as, and for
the purposes herein described and set forth, with reference to the accompanying
drawings.
Dated this 5th day of April 1892.
FREDK. WALKER,
Furnival Street, Holborn, London, E.C., Agent for the Applicant.