IMPROVED APPLIANCE FOR ATTACHING AND DETACHING THE CRAB OF CARRIAGE POLES
Year: 1887

page_text: Date of Application, 7th Jan., 1887
Complete Left, 7th Oct., 1887
Complete Accepted, 8th Nov., 1887
I. HENRY WYMAN JEFFRYES of 7 Snow Hill, London, Gentleman, do hereby
declare the nature of the said invention for "IMPROVED APPLIANCE FOR ATTACHING
AND DETACHING THE CRAB OF CARRIAGE POLES."
"
This invention relates to improved appliances for purpose aforesaid the object being
to provide means whereby the crab can be expeditiously detached in case of accident,
or otherwise when desirable without the necessity of releasing the pole straps or chains,
or of cutting, or detaching any portion of the harness.
According to this my invention in the construction of appliances for purpose
aforesaid the crab bar is mounted loosely on the shoulder of a headed stud the shoulder
being turned to fit the eye of the crab, beyond which the stud is of reduced diameter,
on and near the end of the latter part is a "key," the stud beyond the key is again of
reduced diameter forming a spindle in which, and on opposite side to the key, is
bored a pin hole. The pole end is provided with a lay collar of metal, as ordinary, it
is also bored out for reception of the spindle and key parts, and diameters of the stud.
The key boring is bushed, & in the bush, is cut a longitudinal key bed or grove, the
latter terminating at the end of the bush, & immediately beyond which there is a
connecting and corresponding but radius key bed or grove. Upon the pole is secured
a blade spring the free end of which is turned inwards at right angles thereto and
forms a pin which enters a hole bored through the long collar, and in the head of the
stud are holes or holding slots, the use of the pin & slots is hereinafter explained.
To connect the crab with the pole.
The eye of the crab is received on the shoulder of the stud and between the head
of stud and crab may be introduced a washer of brass or non-corroding metal,
the spindle end of the Stud is now placed within the boring of the pole, and passed
forward, the key on the stud enters the key bed, cut in the bush, along which it
passes, until it reaches the end thereof, simultaneously with which, the inner portion
of the crab is in contact with the bushed end of the pole, whereon the stud will be

page_text: turned part of a revolution, the key now being and moving in the radius key bed
or slot, until the pin hole in the spindle, part of the stud, arrives under the pin end
of the blade spring which at once enters the pin hole, and locks the stud, and crab
firmly in position.
To release the stud, and detach the crab, it is only necessary to raise the blade
spring, so as to lift or withdraw its pin shaped end out of the pinhole on the spindle
part of the stud, then turn the stud in reverse direction to its original turn part of a
revolution, so as to move the key along the radius slot, the key is now opposite its
straight or longitudinal bed, and the stud and crab are at once detached from the
pole.
The holes in the head of the stud serve for reception of ends of a turn key, or
spanner should such at any time be necessary for turning the stud.
The locking pin may consist of the point of the blade spring as described or a ring
set screw may be employed so likewise it is obvious that in lieu of the key being on
the stud the key may consist of a pin passed through the long collar its end protruding
into the bore hole of the pole, and a worm or cam and radius key bed be formed in
the stud this being a mere transposition of parts of one, and the same invention.
Dated the 6th day of January 1887.
WALTER BRIERLEY,
Town Hall Buildings, Halifax,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improved Appliance for Attaching and Detaching the "Crab” of
Carriage Poles.
I HENRY WYMAN JEFFRYES of 7 Snow Hill, London, 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:-
This invention relates to improved appliances for purpose aforesaid the object being
to provide means whereby the crab can be expeditiously detached in case of accident,
or otherwise when desirable without the necessity of releasing the pole straps or chains,
or of cutting or detaching any portion of the harness.
According to this my invention in the construction of appliances for purpose
aforesaid the crab bar is mounted loosely on the shoulder of a headed stud, the
shoulder being turned to fit the eye of the crab beyond which the stud is of
reduced diameter, on and near the end of the latter part is a "key," the stud
beyond the key is again of reduced diameter forming a spindle in which, and on
opposite side to the key, is bored a pin hole, The pole end is provided with a long
collar of metal as ordinary, it is also bored out for reception of the spindle and key
parts, and diameters of the stud.
The key boring is bushed and in the bush is cut a longitudinal key bed or groove,
the latter terminating at the end of the brush, and immediately beyond which there is
a connecting and corresponding but radius key bed or groove. Upon the pole is
secured a blade spring the free end of which is turned inwards, at right angles thereto.
and forms a pin, which enters a hole bored through the long collar and in the head of
the stud are holes or holding slots, the use of the pin and slots is hereinafter
explained.
To connect the crab with the pole-
The eye of the crab is received on the shoulder of the stud, and between the head
of stud and crab may be introduced a washer of brass or non-corroding metal, the
spindle end of the stud is now placed within the boring of the pole, and passed forward
the key on the stud enters the key bed cut in the bush along which it passes until it
reaches the end thereof simultaneously with which the inner portion of the crab is
now in contact with the bushed end of the pole whereon the stud will be turned part
of a revolution, the key now being and moving in the radius key bed or slot until the
pin hole in the spindle part of the stud arrives under the pin end of the blade spring
which at once enters the pinhole and locks the stud and crab jointly in position.
To release the stud and detach the crab, it is only necessary to raise the blade
spring, so as to lift or withdraw its pin shaped end out of the pinhole on the spindle
part of the stud, then turn the stud in reverse direction to its original turn part of a
revolution, so as to move the key along the radius slot, the key is now opposite its
straight or longitudinal bed, and the stud and crab are at once detached from the
pole.
The holes in the head of the stud serve for reception of ends of a turn key or
spanner, should such at any time be necessary for turning the stud.
The locking pin may consist of the point of the blade spring as described or a ring
set screw may be employed so likewise it is obvious that in lien of the key being on
the stud, the key may so consist of a pin passed through the long collar its end
producing into the bore hole of the pole, and a worm or cam and radius, key bed be

page_text: formed in the stud, this being a mere transposition of parts of one and the same
invention.
Such being the nature and object of this my said invention the following is a
complete description of same reference being had to the accompanying drawings-
Fig. 1 is a longitudinal section of pole crab and attachments complete.
Fig. 2 is an elevation of the key bolt detached in order to clearly illustrate its
construction.
Fig. 3 is an end view of the long collar and key bed, bush screwed therein.
Figs. 4 and 5 are details hereinafter referred to.
At 1 is a long collar or cap mounted on end of pole 2 as ordinary, the end of collar 1
being screwed or chased internally at 3 for reception of the threaded bush 4 in which
is cut or formed the longitudinal key bed 5 or the said bush forms part of the long
collar 1. At 6 is a headed stud the shoulder 7 of which is turned to fit the eye S of
the crab bar 9, the part 10 of the said sind is as shewn of reduced diameter and at 11
is formed thereon a key beyond which the stud is turned down or formed as the
spindle part 12 in which is a hole 18 for reception of the end of the holding or
locking pin 16 forming part of or being held in position by means of the blade
spring 17 secured at its other end by means of screw or screws 18.
At 18 is a
washer for reducing friction between boss of crab bar 9 and end of long collar 1. The
end of pole 2 is worked to required diameter for reception of the long collar 1, and
also bored for reception of the spindle part 12 of the bolt 6 there is also cut away a
portion (say half diameter) of the end of the pole 2 so as to form a radius slot 19) for
purpose hereinafter explained. The long collar being placed in position upon and
secured as ordinary upon the pole 2 the pole 16 is bored and the spring 17
secured.
The stud 6 will be passed through the eye 8 of the crab 9 and through the washer S^
the end of spindle 12 will be introduced to the boring in pole 2 in such position that
the key 11 will pass along the key slot 5 until out and clear of the end 20 of the
bush 4 whereon the bolt will be turned or revolved part of a revolution, the key
moving in the slot 19 so as to remove the key clear of the line of the key slot 5 to and
behind the end of the bush after the manner of the bayonet joint, and bringing by
such turn hole 13 in the spindle 12 under the end of the pin 16 the point or lower
end of which is by pressure of the spring 17 then forced into the hole 21, locking the
bolt 6 and all the parts securely in the position shewn by Fig. 1.
To detach the crab it is only necessary to lift the pin 16 that its foot or point is out
of hole 13 then by the fingers and thumb or by a key or spanner such as 22 slipped
over collar 6 turn the stud until the key 11 is opposite the key slot 5 whereon the
stud is free and is pulled out carrying or detaching therewith the crab 9.
It will be evident that in lieu of the key 11 and slot 5 a part of the stud may be
chased and screwed into position, and also that the holding device 17 may consist of a
set screw and that any convenient and portable form of detaching key or spanner 22
may be used.
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, 1 declare that what I
claim is
The loose crab, with a detachable keyed (or chased) boli, a long collar having a
locking device such as 16 all in combination for purpose described and substantially as
illustrated by annexed drawings.
13
1
1032
WALTER BRIERLEY,
Halifax,
Agent for the Applicant.