An Improvement in Cramps Used by Joiners, Cabinet Makers, Carpenters, Wheelwrights, Coachmakers.
Year: 1887

page_text: Date of Application, 21st Mar., 1887
Complete Left, 21st Nov., 1887
Complete Accepted, 21st Mar., 1888
An Improvement in Cramps Used by Joiners, Cabinet Makers,
Carpenters, Wheelwrights, Coachmakers.
WILLIAM HATHURST 16 Ellis Street Burnley, in the county of Lancaster, Cramp
Manufacturer, I do hereby declare the nature of this invention to be as follows:-
In this class of mechanism a cramp is required for bringing the joints close
together and holding the work till it is secured and set.
These cramps are generally made of flat iron with a bracket fast to one end with a
screw in, and there is another loose bracket, or shoe, which slides along the bar, which
can be fixed at any point. The screw then is tightened down and the work cramped
together. My improvement is in the mode of securing this loose bracket, or shoc, by
the means of a small pin, and spring, fixed inside the bracket or shoe. The pin catches
in the slot in the bar & prevents the shoe from slipping when pressure in brought
to bear against it.
The spring keeps it secured when not at work.
WILLIAM HAYHURST.

page_text: Carpenters, Wheelwrights, Coachmakers.
I WILLIAM HAYHURST Cramp Manufacturer, 16 Ellis Street Burnley, in the county
of Lancaster, 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:-
In this class of mechanism a cramp is required for bringing the joints close
together and holding the work till it is secured and set.
These cramps are generally made of flat iron, with a bracket fast to one end, with
a screw in, and there is another loose bracket or shoe, which slides along the bar
which can be fixed at any point. The screw then is tightened down and the work
cramped together. My improvement is in the mode of securing this loose bracket or
shoe, by the means of a small pin and spring, fixed inside the bracket or shoe and
described as follows:-
Fig. 1. represents a cramp complete. A is the bar which can be either T section,
or flat, or square but this fig. shows a flat bar. B is the end which can either be made
out of solid iron, or fastened to the end of the bar, with a hole through the round
part, with a thread inside. C is the screw which works through the boss. D is the
handle which turns the screw in or out as the case may be. E is a sliding jaw or shoe,
connected with the screw C, and slides up and down the bar with the screw, to put
pressure on the work required to cramp as it goes against leiter F. F is also a sliding
shoe, which slides up and down according to the width or length of article required
to cramp.
Fig. 2. represents letter F. G shows a slot where the bar slides through. H shows
the pin inside, which drops in the slots, in the bar to prevent the end from sliding,
when pressure is brought to bear on the shoe, F. 1. shows a recess inside the shoe or
slide, this is made in order to hold a spring, which presses against the wedge J,
which also works in the recess I. K. shows the bar which can be made any
length.
Fig. 3 shows the end view of letter F. L is a slot where the bar slides through.
M is The face of the shoe which the work comes against, required cramping. Fig. 4
shows the spring and wedge inside the letter F. () is a spiral spring which presses
against the bar 1. and keeps the slide F in the position it is placed.
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
clain is
The pin, inside the shoe, F. (which may be formed in the casting or put in after)
and marked H on Fig. 2. and the mode in which it works on the bar to prevent the
jaw or shoe from slipping when pressure is brought to bear against it.
WILLIAM HAYHURST.