Double Headed Split Bolt.
Year: 1890

page_text: Date of Application, 7th May, 1890
Complete Specification Loft, 6th Feb, 1001 Accepted 14th Mar 1891
PROVISIONAL SPECIFICATION.
Double Headed Split Bolt.
WILLIAM MARSH, 218, Jubilee Street, Mile End Road, London, E., do hereby
declare the nature of this invention to be as follows:-
A bolt having a head at either end, one end of the bolt being split in such a
manner as to allow it to close while passing through the hole, the two split ends
of the bolt being pressed together while passing through acts in the nature of a
spring thereby causing the two ends immediately after passing through to spring
back to their normal position & being prevented from passing back again, by the
two half heads on the split end of the bolt, thus making a perfectly secure
fastening, this holt is to be used with or without a thread to enable it to pas
more easily through the hole.
D1
ايت
WILLIAM MARSH.
COMPLETE SPECIFICATION.
Double Headed Split Bolt.
1. WILLIAM MARsu, of 218, Jubilee Street, Mile End Road, London, 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, reference being had to the accompanying sheet of drawings, and to the
letters and figures marked thereon, that is to say:-
This invention relates to bolts or pins for connecting together various articles
such as shackles to chains, the handle shackles of hand bags or portmanteaux to the
frames or other fixed parts of such hand bags or portmanteaux, the connection of
carriage springs to their suspending shackles, the connection together of the parts
of pitch chains for tricycles and other purposes, the connection together of knuckle
joints and certain other parts of machinery, and generally for many purposes where
it is at present customary to employ a bolt or pin with a head at one end, and a
split pin, a screwed nut, or other equivalent device, applied to the other end to
prevent the bolt or pin from coming out of the hole or holes through which it
passes; and the chief object of this invention is to avoid the use of such split pins,
or screwed nuts, by so constructing the bolts or pins that, when they are once put
in place in the parts they are intended to connect, they cannot come out of such
parts unless forcibly removed therefrom. For this purpose I construct the bolt or
pin with a head at each end, the head at one end being usually constructed in the
ordinary way, while that at the other end is made so that it can be passed through
the holes in the parts to be united, and to enable this to be done that end of the
bolt or pin is split in such a manner as to allow it to close or collapse while the
aforesaid head is passing through the hole, and then to spring open again after
the said head has passed through the hole, so as to prevent the bolt or pin from
coming out, thereby making a perfectly secure fastening.
In the drawings hereto annexed, Figure 1 represents a front view partly in
section, and Figure 2 a side view, of a shackle for the handle of a hand bag or
portmanteau, with one of my bolts or pins applied thereto.
A is the shackle, B the lug or other part to which the shackle is attached,
C the bolt or pin made in accordance with my invention. This bolt or pin C is

page_text: made with a head (" at one end in the usual way, and with a head (" at the other
end. (pre cross cuts made in the end of the bolt or pin of such widths that
when the head is forced through the holes in the shackle and the part B to
which it is attached, the end of the bolt or pin C is free to collapse sufficiently to
allow the said head (^ to pass through the said holes; and when the bolt or pin
has reached the position shown in Figure 1. that is to say with the head (2 passed
clear of the said holes, the elasticity of the material forming the split end of the
bolt causes the latter to expaul back into its original shape, in which the diemeter
of the head is larger than that of the hole through which it has passed; and
it is obvious that the lolt or pin ran only he got out by exerting sufficient pressure
endwie to cause its split end to collage until the head is small enough to
pass through the holes,
In order to facilitate the removal of the bolt or pin €
in this way when requires, the underside of the head_(""_mny he hevilled and the
hole through which it has to pa may be corre pondingly counter unk as shown
in Figure 1.
.
In this ea e ti servav
Thew threat
the
Figure 3 show front view pertly in retion, and Figure ka side view se” an
chain hackle with one of wy bit r e pin aplod thereto.
thread is trmed on the list or pin text the head C
enges with a thread tapped in the load in on branch A³ of the leekl
when it in d. back to put the leak or gin in place the latter is introkand thaanga
thed in the brunch And turn 1 road in one direction by man of the
land ("), the pin said ser s thread (then forces the head (½ at the other end of
the bolt or pin. through the unt or d had in the other brandli Ar of the loekk,
the split end of the bolt or pin C collup-ire to allow the said he to
expaling again after the said herd het pas d through the bob. When it
desired to remove the bolt or pin, it is Farnel rod in the oth direction an]
the screw threed (" draws the said head ('- kek thenngh the said hole, the audie
end of the bolt or pin again collapsing to allow the head to pass.
a
...n.1
Figure in front view, partly in section, of a hekle similar to that shown
in Figur: 1 but provided with another modification of my bolt or pin. In this
case the part next the herd (" of the bolt is not screw the ended but is of cylindrical
form, teking into a eslindrical untappel hole in one branch of the hackle,
The hole in the other branch of the shackle is tapped with a crew thread and
the head on the split end of the bolt or pin C is formed as screw thread, or
part of a screw thread, corresponding to the screw thread formed in the said hole :
but preferably of somewhat larger dometer than such thread. To put this pin in
place, the head (2 is passed through the hole in the branch of the sheckle and
is made to engage in the thread formed in the hole in the branch A, the end of
the bolt or pin being slightly collapsed by reason of the head (being somewhat
larger than the thread in the said hole. The bolt or pin C is then turned round
by its head and the head (" follows the screw thread in A until it passes ont
clear of the latter, when the end of the bolt or pin expands as before. springing
out the head to a diameter larger than will pass by the screw thread in the
hales, unless force is exerted endwise of the bolt or pin to cause it to do so; and
the said bolt or pin cannot even then work its way out unless it be turned round
in the proper direction to cause the head (to traverse the screw thread in the
hole of the branch A¼
Figure 6 is a front view, partly in section, of a shackle similar to those shown
in Figures 3 and 3 but provided with another modification of my bult or pin. In
this ease the part of the bolt or pin next the head (may be round, square,
or other suitable shape, taking into a correspondingly shaped hole in the branch A
The split el of the bolt or nut is formed as shown in Figure 7, the head (
being made of about the same diameter as the hole in the branch A. When the
bolt or pin is inserted a taper serew is werewed into a corresponding hole
bored and tapped into its end, and the said end is thereby expanded as shown in
Figure 6 until the head C is larger in diameter than the hole through which it

page_text: has passed, so as to prevent the bolt or pin from working its way out. It is
obvious that in some cases the ordinary head (" may be dispensed with and both
ends of the bolt or pin be split and provided with a lend C and taper screw C³.
Figure 8 shows, partly in section, a portion of a pitch chain such as is used for
carrying the buckets of an elevator, showing how my bolts or pins may be applied
for connecting together the links. In this case the bolts or pins are shown split
at both ends; but if preferred they may be split at one end only and be provided
with an ordinary head at the other end similar to that shown at C" in Figures 6
and 7 for example.
In the drawings the split ends of the bolts or pins are shown of circular
section; but it is obvious that when it is not required to turn the bolt or pin
round in order to screw it into or out of position, or for other purpose, the split
end may be of square or other section. In the examples shown in the drawings,
the ends of the bolts or pins are shown with two slits crossing one another. It
is obvious that the number, width and arrangement of slits may be varied
according to the size and material of the bolt or pin as well as the purpose to
which it is to be applied; for example in sinall bolts or pins a single slit is
sometimes sufficient, but in that case the head (should be cut away at the sides,
or made of oval form as shown in Figure 9, because not being collapsible sidewise
the bolt or pin could not be inserted into or withdrawn from its position if the
head were left projecting at the sides. When the bolt or pin is of considerable
size, two, three, or more slits may he made in its end, the solid parts left collapsing
radially to allow the head C to pass through the hole and then springing out
radially again when the said head has cleared the hole.
The bolts or pins are preferably made of material such as steel or hard brass
for example that is sufficiently elastic to return to its original form after under-
going the deformation necessary to allow the head C2 to pass through the hole.
But when the end of the bolt or pin is expanded by means independent of the
clasticity of the material itself, as in Figure 6 for example, the bolt or pin may
be made of more or less inelastic material.
Similar letters of reference relate to like parts in all the figures of the drawings.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I would have it understood
that I am aware that it is not novel to split the ends of bolts and pins, and to
bend the split parts outwards to prevent such bolts or pins from coming out of
the holes in which they are placed, or to prevent nuts from working off the
screwed ends of bolts or studs, and I make no claim generally to splitting the earls
of bolts or pins for such purpose but that what I do claim is:—
First. The connecting bolt or pin, one end of which is made solid and provided
with any suitable head, and the other end of which is split and provided with a
head adapted to pass, by the radial yielding or collapsing of the parts forming the
split end of the bolt or pin, through the holes of the parts to be connected, and
to expand by the radial springing out of the parts forming the split end of the
bolt or pin, when such head has passed clear through the said holes, substantially
as hereinbefore described and illustrated in Figures 1, 2, 3, 4, 5 and 9 of the
drawings.
Second. The connecting bolt or pin, one or both ends of which is or are split
and provided with a head or heads adapted to pass through the hole or holes in
the part or parts to be united, the split end or ends being afterwards expand d
by means of a taper screw, so as to make the head or heads thereon larger then
the holes through which it or they has or have passed substantially as hereinbefore
described, and illustrated in Figures 6 and 7 of the drawings.
Third. The connecting bolt or pin split at both ends, each end being provided
with a head adapted to pass, by the radial yielding or collapsing of the parts
forming the split end of the bolt or pin, through the hole in the part to be

page_text: connected, and to expand by the radial springing out of the parts forming the split.
end of the bolt or pin when such head has passed clear through the said hole.
substantially as herein before described, and illustrated in Figure 8 of the drawings.
Fourth. The double headed split bolt or pin constructed and applied substantially
as hereinbefore described, and illustrated in the drawings.
Dated this 5th day of February 1891.
W. MAKSI.
Per W. H. Beck,
115, C'annon Street, London, E.C., Agent.