An Improvement in Screw Bolts.
Year: 1892

page_text: Date of Application, 16th Dec., 1892-Accepted, 4th Feb., 1893
COMPLETE SPECIFICATION.
An Improvement in Screw Bolts.
I, DAVID JAMES, of 17 Park Street, Swansea, Boiler Maker, 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:-
As is well understood, it is sometimes necessary to use bolts in the operation of
patching up or repairing leaks in boilers or in ships' sides or bottoms, and in such
operations it frequently arises that the bolts have to be passed through the plates
from the inside. This, under certain circumstances, is difficult and dangerous to
do, more especially when the bolt-holes are required to be in positions which
render access to them from the inside of the boiler, ship or other structure
hazardous and awkward.
This invention consists in an improvement in bolts whereby they are adapted to
be passed into bolt-holes from the outside of a boiler, ship or other structure.
According to this invention the bolts are made without the usual head, for which
latter is substituted a tongue free to turn on a pivot or hinge so that it may be
made to lie, at will, either at a right angle to the axis of the bolt, which is slotted
to receive it, or parallel therewith.
When the bolt is to be inserted in a hole in the plates of a boiler, ship or other
structure the tongue is made to lie in the position in which it is parallel with the
axis. After insertion and when a sufficient length of the bolt has passed clear of
the inside of the plates, the bolt is shaken or struck on the outside and in this way
the tongue is made to swing to the position at which it is at right angles to the
axis of the bolt. The tongue thus becomes a substitute for the head, and the nut
is applied at the outside end of the bolt to draw the latter up and secure the bolt in
place.
At Fig. 1 in the accompanying sheet of drawings is shown one form of bolt
constructed and fitted in accordance with this invention.
In the smooth or unthreaded part of the bolt is a slot cut midway in the bolt and
in this slot is a tongue a free to be turned on its pivot pin b. The fig. shows the
position which the tongue a is made to assume in the slot to adapt the bolt for
insertion in a horizontal, vertical or inclined bolt-hole from the outside of a boiler,
ship or other structure. After insertion, the bolt is shaken, or struck with a
hammer and the tongue a then turns on its pivot pin b and lies across the bolt, as
seen at Fig. 2. The tongue now serves as a bolt-head, and a nut is applied to the
screw-threaded end and screwed up on the plates c, Fig. 2, from the outside. The
bolt when fixed in position affords a convenient hold for fixing a ratchet brace or
other drilling appliance.
The use of such bolts is not limited to patching leaks, as such bolts are adapted
for holding down the bed plates of engines and machines.
At Fig. 3 is illustrated a modification according to which the pivot b on which
the tongue a turns is not fixed, but is free to move up and down in slots b' cut at
opposite sides of the bolt at a right angle to the slot in which the tongue a is
contained.
The slot in which the tongue a lies does not extend, as in the bolt shown at
Figs. 1 and 2, to the lower extremity of the bolt which is solid thereat as indicated
at Fig. 4 where the bolt is shown inverted, a position for which it is specially
adapted, so that it may be inserted from the outside through the underside of a
boiler or ship.

page_text: Having now particularly 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 :-
The provision in a screw bolt of a tongue such as a free to turn in a suitable slot
cut in the bolt, the pivot pin being either fixed as hereinbefore described with
reference to Figs. 1 and 2 of the accompanying drawings, or arranged to have
play in slots cut at right angles to the slot provided in the bolt for the tongue, as
hereinbefore described with reference to Figs. 3 and 4 of the accompanying
drawings.
Dated this 12th day of December 1892
NICHOLAS WATTS,
Agent.