Year: 1886

page_text: I ARTHUR BRAMHAM PERKINS, of "The Forge' " Thornton Road, Bradford, in
the county of York, Ironmaster 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 a loose cover or socket which can be placed upon the
head of a box-bolt or sunken bolt or sunken nut, and by means of which loose
head the box-bolt or sunken nut can be adjusted by means of an ordinary screw
key and without it being necessary to use a special box key.
To carry out my invention I form of suitable metal a loose cap or socket the
internal recess of which fits upon the square or hexagonal heads of the box bolts
or sunken bolts or nuts it is intended to operate upon.
The part of the cap or socket immediately surrounding the head of the bolt is
cylindrical outside but has a higher portion which projects from the hole in which
the head of the bolt or nut is sunk which portion is square or hexagonal in form
and of standard size and upon which an ordinary screw-key or spanner can be
fitted to operate upon the bolt or nut.
In the top of the square or hexagonal loose caps or sockets are formed angular
holes, which pass straight through the tops of the caps or sockets to the internal
angles in the recess of such caps or sockets, and through these holes a file can be
passed for the purpose of filing out such angles.
By means of this improved cap or socket which is simple in construction and of
small cost, I am enabled to facilitate the adjustment of box-bolts or sunken bolts
or nuts by the aid of an ordinary screw key or spanner, or the improved socket
can be placed upon the finished head of an ordinary bolt or upon a finished nut
and will serve as a protector for it thereby preventing damage to or bulging of the
angles thereof.
In order to enable my invention to be fully understood I will proceed to
describe the same by reference to the accompanying drawing in which Figure 1
represents a plan of the cap or socket hereinafter described, Figures 2 and 3, are
an elevation and a vertical section respectively, of the same. Figure 4 represents
a section of a cap or socket applied to a sunken nut.

page_text: The cylindrical part of the cap B fits upon or over the bolt head or nut to be
adjusted. The hexagonal flange A is by preference made of a standard size in
order that an ordinary screw key or spanner may fit thereon. In Figure 4, two
plates F and G are represented as being bolted together by means of a bolt D and
nut E; the nut E is let into a recess in the plate F; upon or over this nut is
placed the cap or socket and the hexagonal flange A projects above the level of
the top of the plate where it can be operated by means of an ordinary screw key,
thus obviating the necessity for using a box key.
The holes in the top of the cap or socket pass straight through to the angles
in the hexagonal recess in the cap or socket, and thereby facilitate the filing of
such angles.
The recess in the cap may be square in form or of other suitable form to fit the
nut and the flange A upon which the screw key fits may be square or of other
required form.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. A cap or socket constructed to fit over a bolt head or nut such cap or socket
being arranged and operating substantially as described and represented in the
accompanying drawing.
2. A cap or socket constructed to fit over a bolt head or nut so as to act as a
protector for the same substantially as described and represented in the accom-
panying drawing.