Slip Hook with Lock Attachment for Pole Chains, Harness, and other purposes.
Year: 1893

page_text: Date of Application, 26th July, 1893
Complete Specification Left, 26th Apr., 1894-Accepted, 25th May, 1894
PROVISIONAL SPECIFICATION.
Slip Hook with Lock Attachment for Pole Chains, Harness, and
other purposes.
JOHN NEW BOULD 86 Broad Street Park Gate near Rotherham Watchmaker
and Jeweller do hereby declare the nature of this invention to be as follows:-
Slip Hook with Lock Attachment for Pole Chains, Harness, and other
purposes.
Closed. A hook one part opens outwards, when closed being held in position by
a sliding collet on the stem, which collet is kept secure by sliding over a fixed pin
and held in its secure position by a circular spring ring inside the collet.
Dated this 25th day of July 1893.
COMPLETE SPECIFICATION.
Slip Hook with Lock Attachment for Pole Chains, Harness, and
other purposes.
I, JOHN NEW BOULD, of 86 Broad Street, Park Gate, near Rotherham, in the
County of York, Watchmaker and Jeweller, do hereby declare the nature of my
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 object of my invention is to construct a slip hook with lock attachment for
pole chains, harness and other purposes which when secured by the lock attachment
will remain closed but which in time of need can be readily opened and the chain,
strap, or other gear detached from the hook.
My invention will be better understood on reference to the accompanying sheet
of drawings in which
Fig. 1. represents a side elevation of my improved slip hook, shewing the hook
closed and locked, Fig. 2. being a front elevation of the same.
Fig. 3. is a side elevation of the appliance unlocked with the hook open, Fig. 4.
being a front elevation of the same.
Fig. 5. is an elevation in section of the lock attachment, Fig. 6. is a plan of the
same with the circular washer or cap removed.
Fig. 7 is a plan of a circular spring ring used inside the lock attachment or sliding
collet, Fig. 8. is an edge view of the same.
Fig. 9. is a plan of a circular washer or cap which is fitted into the upper part of
the lock attachment and where it is screwed, rivetted or otherwise secured, and
Fig. 10. is an edge view of the same.
The same letters refer to similar parts throughout the several views.
a. is the shank or stem of the hook with a fixed jaw a' so formed as to carry the
whole tension of the chain, strap, or other gear to which it may be attached,
b. is the shank of the loose or opening part of the hook and b¹ the jaw of the same,
c. is the pin on which the loose or opening part of the hook works; when closed
the shank, b, of the opening part lies flush with the shank, a, of the fixed part
which is suitably recessed for the purpose as shewn in the drawing; d. is a sliding
collet or lock attachment in the form of a sleeve, so fitted and constructed as to
slide over both the shanks a.. and b. when closed. I provide a guide pin, e, on the
[Price 8d:]

page_text: shank and a corresponding slot or groove, e', inside the attachmeut d. I also
recess the attachment d, at its upper end as shewn in the section Fig. 5. deep
enough to receive a circular spring ring, f, and a circular washer or cap, g, placed
above the last named spring ring,, so that when in position the cap, g, may be
screwed, rivetted or otherwise fixed so as to prevent the spring ring, f, from coming
out of place.
The spring ring, f, is shewn separately from the attachment d, in Figs. 7 and 8,
in which it will be seen that the ring is cut wide enough to allow of the fixed
pin, e, on the shank, b, to pass into the space h, between the ends of the spring.
The spring ring, f, is likewise recessed as shewn in the plan at i, and the
attachment d. is provided with a pin, j, fixed in the recess previously referred to,
so that when the spring, f, is placed into the recess the space, , is placed opposite
the corresponding slot or groove, e', in the attachment d, and at the same time one
of the recesses, i, of the spring, will be close up to the pin j.
Having thus described the various parts of the lock attachment it will be seen
that when the same is placed over the shanks, a and b, of the hook when closed,
that the attachment d. must be turned so that the slot or groove e' comes opposite
to the fixed pin e, on the shank b, when the attachment can be slided down both
shauks until it is stopped by the pin, c, when in that position the fixed pin e. will
be clear of the slot e¹, but it will be in the recess and space, h, between the ends of
the circular spring,/, and in that position the attachment, d, can be turned round
until the fixed pin, e, is out of line of the slot, e', and until the end of the recess, ¹,
is brought in contact with the pin, j, and in that position the attachment, d, will be
prevented turning back again by the friction of the spring within its recess and
thereby locked and the hook securely closed.
When it is required to open the hook the attachment d, can be turned back by
exercising a sufficient force to overcome the friction of the spring (which is
suitably adjusted for the purpose) until it is stopped from moving further by the
pin, j, and as already described when in that position the space, h, of the spring,
and the pin e, of the shank, is in line with the slot, e, so that the attachment, d,
can be slid upwards on the shank, a, until it is clear of the shank, b, when the hook
can be opened.
In my improved form of hook as here described, the tension being all taken
by the fixed part there is no liability of the lock attachment becoming jambed
as might be the case if the tension came on the loose part of the hook as well as on
the fixed part.
I am aware that slip hooks have been made with a pivotted jaw or jaws and that
such hooks when closed have been partially secured by means of a collar or sleeve
made to slide over the shank or shanks of the hook and I lay no claim to novelty
in this respect.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is,
1. In a slip hook the arrangement and combination of parts and. appliances by
which the whole of the tension of the chain, strap or other gear may be borne
by the fixed portion of the hook, the loose portion being only employed for
the purpose of securing such chain, strap or gear and preventing the same
from slipping out in the manner and for the purposes substantially as herein
described and illustrated.
2. In a slip hook the arrangement and combination of parts and appliances
comprising a sliding collet or lock attachment on the shank or shanks of the
hook provided with a groove or slot formed to slide over a fixed pin on the
shank of the loose jaw of the hook, such attachment being recessed on its upper
end; a circular spring ring fitted inside the last named recess and a fixed pin to
prevent the spring from turning round beyond certain limits, a washer or cap
secured into the upper part of the recess to retain the circular spring in position

page_text: by means of which the hook when closed may be secured and locked and by means
of which in time of need the hook may be readily opened and the chain, strap, or
other gear detached therefrom in the manner and for the purposes substantially as
herein described and illustrated.
D
at 1901
R. HEBER RADFORD,
Agent for the Applicant.