An Improved Slip Hook.
Year: 1888

page_text: Date of Application, 19th N. v:, 1888:
Complete Specification Left, 18th July, 1889-Accepted,. 31st Aug., 1889
PROVISIONAL SPECIFICATION.
An Improved Slip Hook.
I, CHARLES HENRY BENNETT, 5, Sleaford Street, Attercliffe, in the borough of
Sheffield in the county of York, Fitter and Turner do hereby declare the nature of
this invention to be as follows.:-
This invention has for its objects to supply a simple and efficient slipping, apparatus
or "slip book" applicable to all purposes in which it is desirable to provide means for.
readily detaching a chain, rope or other attachment from a part to which it is con-
nected when in use, but from which it may be necessary to disconnect it while a.
strain or pull is being exerted thereon, and though my invention.is especially applicable
for skidding and locking the wheels of road vehicles, it may be applied to all other.
purposes in which it is desirable to provide means for readily detaching one purt from.
another to which it is connected, while a strain is being exerted. thereon, such. for
instance as for connecting the harness of horses to carriages or other. vehicles, so that
should the horse or horses fall down in which case a great strain is frequently brought
to bear on the attachments, which are as usually constructed very difficult. to
anfasten,.causing the horses to be unduly punished as well as causing a stopage in
the traffic, my improved slip hook may be easily unfastened, and thereby release the
harness and permit the horse or horses. to rise, while the hook under ordinary
circumstances will form a secure and efficient connecting piece between the parts to be
joined together..
According to this invention my, improved slipping apparatus or "slip hook."
consists of two ordinary J hooks one of these hooks,, which I shall hereinafter call.
the main hook, is formed at one end with the usual eye or other. suitable means for
connecting it to the vehicle, pole, chain or other part to which it is desired to attach
it, and the other end is bent round' so as to form half a circle or thereabouts, this
main hook 1 prefer to make of steel. The other. book is made somewhat smaller
than the main hook so that it will fit in it. The turned up end of the main hook is
pivotted to the back of the second look so that when closed the second hook fits in
the main hook standing in a reversed way, thus forming. a: closed hook or link in
which the shackle, link, hook or the like of the part to be attached thereto is heldt;
the point of connection of the two hooks being above or more backwards. than the
point at which the strain is applied to the hook,.so that if the pull should be made
even at a right angle with the hook itself it would not be opened, unless the part
connected thereto was thrown on the opposite side of the pivot by which the two
hooks are connected. The arm of. the second or inner hook may be suitably shaped
for taking hold of for the purpose of opening the hook to allow the part attached
thereto to be released.
To prevent any possibility of the hook opening by its own weight, during a.
momentary relaxation of the attachment, caused, by jerks or shakes, I devide the
and of the main hook, to which the second hook.is pivotted, so as to form a pair of
jaws between which the second hook is to work on the pivot; on the inside of the
said jaws I make a groove or recess (or more than.one if desireable); on the side
or sides of the second hook I. make a corresponding number of ridges or elevations
which, when the hook is closed fit in the said groove or grooves in the jaw or jaws so
as to hold the two parts of the hook in their closed position. When the arm of the
second or inner hook is pulled apart from the arm. of the main hook the ridge or
ridges on the second or inner hook leaves the said groove or grooves and presses
open the jaws in which they work, when the hook is again closed the said ridge or
ridges on the second or inner hook resumes its or their former position and the

page_text: jaws between which they work close by their own elasticity and retain it in its proper
place.
The oporation is as follows:-suppose the main hook to be connected to a point
above by means of the eye, and the link of a chain be inserted in the second or inner
hook and the arnis than closed, any pressure or pull exerted on the chain will bear
on that part of the inner hook which extends below the point where the two hooks
are pivotted together, and so tend to force the arms more firmly together, and thereby
forming an efficient connection, as there is no possibility of the chain link slipping
off as it must rise up above the point where the two hooks are connected before it
can liberate itself. When it is desired to disconnect the chain the arm of the inuer
hook is pulled outwards, and if any pressure or pull is being exerted on the chain a
very slight movement of the arm will cause the pull to be brought to bear on the
part of the inner hook which is on the other side of the pivot, so that the pull itself
will tend to open the arms, and the link of the chain will slip off the arm of the inner
hook.
1 am of course aware that there are several kinds of slip hooks in use for
detaching one part from another when there is a strain or pull being exerted thereon.
1 am also aware of the Patent granted to Charles Frank Conway Morris A.D. 1884
No. 2540 which consists of two arms pivotted together, but in his invention the
arms are bent in the sides so as to form half a circle or a little more so that when
the two arms are closed they form a circle and the pivot is at the bottom, so that if
the shackle or chain attached thereto was to pull a little to one side the hook would
open and let the chain or shackle slip off, were not arrangements made for holding
the arms tightly together, whereas in my improved slip hook I pivot the hooks
together above or more backwards than the point where the pressure of the the attach-
ment is brought to bear, by this simple differance my improved slip hook will securly
hold the parts connected thereto even should the pull be at right angle to that of the
hook, provideing the connecting link is not thrown on the wrong side of the pivot a
thing that will not happen in practice.
Dated this 17th day of November 1908
CHARLES HENRY BENNETT.
COMPLETE SPECIFICATION.
An Improved Slip-hook.
I, CHARLES HENRY BENNETT, 5, Sleaford Street, Attercliffe, in the borough of
Sheffield, in the county of York, Fitter and Turner, do hereby declare the nature of
this invention and in what manuor the same is to be performed, to be particularly
described and ascertained in and by the following statement:
This invention has for its objects to supply a simple and efficient slipping apparatus
or "Slip Hook" applicable to all purposes in which it is desirable to provide means
for readily detaching a chain, rope or other attachment from a part to which it is
connected when in uso, but from which it may be necessary to disconnect it whilst a
strain or pull is being exerted thereon, and though my invention is especially
applicable for skidding and locking the wheels of road vehicles it may be applied to
all other purposes in which it is desirable to provide means for readily detaching one
part from another to which it is connected while a strain or pull is being exerted
thereon, such for instance, as for connecting the harness of horses to carriagos or other
vehicles so that should the horse or horses fall down, (in which case a great struin is
frequently brought to bear on the attachments which are, as usually constructed, very
difficult to unfasten) my improved slip-hook may be easly unfastened and thereby
release the harness and premit the horse or horses to rise, whilst the hook under
ordonary circumstances will form a secure and efficient connecting peice between the
parts to be joined together.
In order that my invention may be clearly understood, I annex two sheets of
Drawings.

page_text: Similar letters of reference indicate corrosponding parts in all the Figures.
Figure 1 is a complete Slip-hook constructed according to my invention.
Figs. 2, 3, 4 and 5 are detailed views of the same; showing the parts separately.
Figures 6, 7 and 8 shows a modification in the arrangement of the inner or Lever
hook.
According to this invention, my improved slipping apparatus or "Slip-hook,"
consists of two hooks similar to the ordinary J hook, one of these hooks, which I
shall hereinafter call the Main Hook, marked A on the accompanying Drawings, is
formed at one end with the usual eye B, or other suitable means for connecting it to
the part to which it is desired to attach it. The other end C, I described in my
Provisional Specification as being bent round so as to form half a circle or there-
abouts, so that should the pull be even at right angle to the hook it would not let
the attachment go, but as the pull on hooks for the like purposes is practically never
far out of a stright line with such hooks and as I find that the hook is quiet safe even
when the end C is bent at right angle (in the form of the letter L), and that the
shallower the main hook is the easer is the hook to unfasten, I now prefer to make
the hooks as shown on the accompanying Drawings as being best adapted for general
use, but I do not confine myself to such an anglo.
The second or Lever hook D is made of suitable shape to fit in the main hook as
shown on the accompanying Drawings.
At the back and neer the bottom of the lever hook there is a Lug c (Sheet 1)
which fits between the jaws E (Sheet 1) at the turned up end of the main hook; the
two hooks being held together by the rivet d, forming an hing joint. Or instead of
connecting the lever hook to the main hook by means of a lug at the back as just
described, the lug may be at the turned up end of the lever hook as shown on sheet 2
of the accompanying Drawings; in either cases there is a guard to prevent the
possibility of the attachment from slipping off, in the first case the said guard is
formed by the arm or lever D of the inner hook and in the second case by the pro-
longation of the turned up end e of the lever hook.
To prevent the possibility of the hook opening by the weight of the arm or
lever of the inner hook, should the hook be turned in a favorable position during
a relaxation of the attachment, I proposed in my Provisional Specification to make
the joint Ea lock joint but as there are several objections to such a joint I prefer to
put a clasp F, which is made of sheet steel or other elastic material, so that it claspes
the arm of the main hook and is riveted thereto by the rivet f. Each of the jaws of
this clasp are bent so that they press tightly together neer the ends and are curled
at the ends as shown at Fig. 5 so that when the lever or arm D of the lever hook is
pressed between the jaws they will close round it and securely hold the two arms of
the hooks together and a very slight pull or push will be sufficient to release or
replace the lever D when desired.
The modus operandi is as follows:-suppose the Main hook be connected to a
point above by means of the eye, and a link of a chain be hooked on the inner or
lever hook and the arms pressed together the clasp, as hereinbefore described, will
hold the arm of the lever hook in its place, and as that part of the book on which the
pull is exerted is level or below the joint of the hooks it will tend to force the arms
inore firmly together and thereby formes an efficient connection, as there is no
possibility of the chain link slipping off as it cannot get beyond the joint of the
two hooks, where as, in the case of Morries Patent (A.D. 1884. No. 2540) the joint
is below the inner hook, so that instead of the pull or strain on the book tending to
make the hook more secure all the force of the pull is tending to open the hook,
which makes it necessary to have a ring round the two arms which, like the slide
link of the ordinary slip hook, is held very tight by the pull on the attachment
and is difficult to unfasten whilst the pull is on the hook, where as in my invention
the device for holding the arms of the hooks together has only the weight of the
arm of the lever hook to bear should the hook be turned in such a position, during
the relaxation of the attachment, that the lever of the inner hook would fall from the
main hook if it was lift free,

page_text: Having now particuary 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
claim. is.
Ist. The construction and' use of a Slip-book substantialy as und' for the purpose
described and shown on the accompanying Drawings.
2nd: In a Slip-hook the Clasp Fig..5 substantialy as and' for the purpose-specified?
Dated this 17th day of July 1889.
CHARLES HENRY BENNETT.