Year: 1886

page_text: Date of Application, 6th Apr., 1886.
Complete Left, 4th Jan., 1887.
Complete Accepted, 4th Feb., 1887.
[Communicated from abroad by GEORGES COULON, of Paris, in the Republic of France,
Director of the Société civile propriétaire du serrage par Coulon sans filets ni
ierou.]
I ALFRED JULIUS BOULT of 323 High Holborn in 'the County of Middlesex,
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in locking bolts or pins without screw
thread or nut destined to replace advantageously the ordinary bolt in most of its
applications for instance to join metal or wooden parts, to fasten the fishplates on the
rails or to join metallic sleepers.
The cylindrical rectangular or other conveniently shaped bolt or pin has a head of
any suitable form and usually of equal dimension in the whole length of its shaft.
Near the end this shaft is provided with two parallel slots or recesses the edges
of which nearest the end of the shaft are tapering. The slots are designed to receive
the arms of a forked key and as these arms are tapered to the same angle as the slots
they will always fit properly therein.
The arms of the forked key are split for some distance so as to form two tongues
which are slightly longer than the arms and it follows from this arrangement, that
when the bolt is put into its place and the key fitted into the slots and driven home
the tongues need only be lifted or bent by some instrument to hold the bolt firmly in
its position. The key can be firmly imbedded in the slots, by striking it on its head,
and the bent tongues resting against the body of the bolt itself effectually prevent the
bolt from moving.
If the bolt is to be withdrawn the bent tongues are hammered down again into their
original position and then the key and the bolt driven out.
By the aid of this holt pieces or parts can be rapidly connected or disconnected. It
is especially applicable to the joining of fishplates and rails, the more so as there is no
rusting of the screw thread, which it is so often the cause of the breaking of the bolt,
and therefore it can be used for an almost unlimited period and is in consequence
economical in its use.

page_text: I, ALFRED JULIUS BOULT of 323, High Holborn, in the County of Middlesex,
M.I.M.E. 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 improvements in locking bolts or pins without screw thread
or nut destined to replace advantageously the ordinary bolt in most of its applications
for instance to join metal or wooden parts to fasten the fish plates onto the rails or to
join metallic sleepers.
In the accompanying drawings
Figure 1 represents a bolt in position to join two parts and provided with its forked
key.
Figure 2 is a side elevation of the bolt.
Figure 3 represents a plan of the bolt and key.
Figures 4, 5, 6, 7, 8 and 9 represent a modification.
Referring to Figures 1, 2 and 3, the cylindrical, rectangular or other conveniently
shaped bolt A has a head A' of any suitable form, and is usually of equal dimension in
the whole length of its shaft. Near its end this shaft is provided with two parallel
slots or recesses B and B the edges of which nearest the end of the shaft are tapering.
These slots are designed to receive the arms e of the forked key Cand as these armis
are tapered to the same angle as the slots they will always fit properly therein.
The arms of the forked key are split for some distance so as to form two
tongues which may be slightly longer than the arms e and it follows from this
arrangement that when the bolt is put into its place and the key fitted into the slots
and driven home the tongues e need only be bent or lifted by some suitable instru-
ment to hold the bolt firmly in its position. The key can be firmly imbedded in the
slots by striking it on its head and the bent tongues e resting against the body of the
bolt itself effectually prevent the bolt from moving.
If the bolt is to be withdrawn the bent tongues el are hammered down into their
original position and then the key and the bolt are driven out.
Figures 4, 5, 6, 7, 8 and 9 represent a slight modification in the manner of
preventing the key from slipping out. This modification adapts itself especially for
the fastening of the fish plate bolts on railways.
In this construction the sides of the slots B B' are not quite parallel as in the former
case but the metal D between them is thicker on the side M where the key enters than
on the side N. As regards their other sides F and G, they are constructed the same
as in the first case.i.e. according to the tapering of the key.
The key with the exception that the tongues are not split is constructed as in the
former case and the extreme ends of the two branches of the fork are rounded off to
facilitate the fitting of the key onto the bolt.

page_text: In case this arrangement be adapted to the fastening of fish plates as represented in
Figure 9 the two branches of the fork of the key, in consequence of the conical
arrangement of the metal between the slots B B¹ will tend to open when driven home
and being held tight by the sides of the groove X in the fish plate Y they will in
consequence bend upon the sides of the slots in proportion to the tension as represented
in Figure 9 and by this the key is tightened and the bolt effectually locked. Besides
when the key is being driven home the extreme ends of the fork will lift themselves
slightly under the influence of the inclined segments of the slots which is an additional
cause of a perfect tightening of the key and locking of the bolt.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed, I declare that what I claim is :-
1. A bolt or pin such as A provided near its point with two parallel tapering
slots B B substantially as and for the purpose specified and shown in Figure 1 to 3 of
the accompanying drawings.
2. A forked key C the arms e of which are tapering and are split for a distance
forming the tongues e¹ which are bent back to prevent the key from slipping when
placed in position substantially as and for the purpose specified.
3. The combination with a bolt or pin such as A having parallel tapering slots BB¹
of a divided wedge such as C tapered to match said slots unadapted to be fitted therein
substantially as and for the purpose specified.
4. A bolt or pin such as A provided near its point with two iapering slots or
recesses such as B B' the metal between them also tapering substantially as and for the
purpose specified and illustrated in Figures 4, 5, 6 and 9 of the accompanying
drawings.
5. The combination with the slotted bolt A and key wedge C of the fish plate Y
slotted at X to receive the key substantially as and for the purpose specified.