An Improved Sash or Bench Cramp for Joiners and others.
Year: 1892

page_text: Date of Application, 12th Aug., 1892
Complete Specification Left, 6th Oct., 1892-Accepted, 19th Nov., 1892
PROVISIONAL SPECIFICATION.
An Improved Sash or Bench Cramp for Joiners and others.
I, GEORGE GLASSON of 58 Upper Bainbrigge Street Derby in the County of
Derby Carpenter & Joiner do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to provide an improved sash or bench cramp for
joiners and others which may be instantaneously adjusted and is self fastening, is
stronger than the cramps at present used and will not damage the work by
scratching or bruising.
In carrying out my invention I employ an iron or steel bar either flat or T shaped,
the same being toothed, milled, indented or raised on the upper part of one or both
sides in the case of the flat bar and on the outer edges of the cross part in the
case of the T shaped bar, the length of the bar varying with the different kinds of
work for which it is required. The other end of this bar is provided with the
ordinary "head or appliance for screwing up the work to the "foot"; it is to
the latter and the bar that my improvements more particularly relate.
"
To this moveable foot I pivot or hinge one or more cam shaped jaws or lugs of
suitable shape, or I may employ one or more loose parts of a wedge shape held in
by a rivet passing through the foot or the wedge may be slotted and have the rivet
passing through it if desired to keep it from falling out. These jaws or lugs, loose
parts or wedges are also toothed, milled, indented or raised to fit the sides of the
bar. When the work is pressed by means of the screw "head" against the "foot"
the sides of the bar are brought in contact with the cam shaped jaws or lugs, loose
parts or wedges and the latter by their peculiar shape, wedge firmly against the
sides of the bar and hold it rigidly in position.
As at present constructed these bars are often roughened on the upper surface,
this damages the work which has to lie on the said surface, it will be seen that by
my invention the
upper surface
may be left perfectly smooth.
I may make the said cams or jaws in the form of levers so that they may be
withdrawn from the bar by pressing the outer ends of the same inwards and dis-
engaging the teeth indents, &c.
Dated this 3rd day of September 1892.
GEORGE GLASSON.
COMPLETE SPECIFICATION.
An Improved Sash or Bench Cramp for Joiners and others.
I, GEORGE GLASSON of the Excelsior Works, Agard Street, Derby in the
County of Derby, Carpenter and Joiner, 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 :-
The object of my invention is to provide an improved sash or bench cramp for
the use of joiners and others, which may be instantaneously adjusted and is self
fastening, is stronger than the cramps at present used and will not damage the work
by scratching or bruising.
In order that my invention may be the more readily understood I have caused to
be annexed to this Specification a sheet of drawings, the figures and letters of
reference marked thereon being hereafter referred to.
Figure 1 is a side elevation of a bench cramp constructed according to my
invention.

page_text: 6
Figure 2 is a plan of same.
Figure 3 is a side elevation of a sash cramp constructed according to my
invention.
Figure 4 is a plan of same.
Figure 5 is an enlarged plan of the cam shaped jaw shewn on Figures 1 and 2,
the plan being taken on line 'a' 'a' of Figure 1.
Figure 6 is an enlarged plan of the toothed wedge shewn on Figures 3 and 4, the
plan being taken on line 'b''b' of Figure 3.
In carrying out my invention I employ an iron, steel or other metal bar either
flat as at A or T-shaped as at B, the same being toothed, milled, indented or raised
on the upper part of one or both sides in the case of the flat bar as shewn at C,
and on the outer edge or edges of the cross bar in the case of the T-shaped bar as
shewn at D; the length of the bars varying with the different kinds of work for
which they are required. On the accompanying drawings only two different kinds of
indents, teeth or milling are shewn; it is evident. however that I may use a variety
of forms that will serve to stop and keep the 'foot' in position. The other ends of
the bars A and B are provided with the ordinary screw 'heads' E and F, or other
appliances for screwing up the work to the 'feet' G and H. It is however to the
feet' and bars that my improvements more particularly relate. To the moveable
foot I pivot or hinge one or more cam shaped jaws or lugs K of suitable shape or
I may employ one or more loose parts of a wedge shape L held in by a rivet
passing through the foot, or the wedge may be slotted and have the rivet passing
through it as shewn on Figure 6, or the thinner end may be slightly enlarged as
at M to prevent its dropping out. The foot is kept from sliding off the bar by any
suitable stop or stud.
These jaws, lugs, loose parts or wedges K and L are also toothed, milled,
indented or raised on their inner faces I and J to fit the sides of the bars so that
when the work is pressed by means of the screw 'heads' E and F against the
'feet' G and H the sides of the bars are brought into contact with the inner faces
of the cam shaped jaws or lugs, loose parts or wedges K and L and the latter by
their peculiar shape wedge firmly against the sides of the bars and hold the 'feet
rigidly in position.
In case where the cam shaped jaws or lugs K shewn in Figures 1, 2 and 5 are
used I may mount springs as at N, Figure 2, to hold the same up to the sides of the
bar or they may be mounted on the pivots as at O if desired, see Figure 2.
It will be observed also that with this cam shaped form of jaw or lug that as
soon as the indents or teeth thereon are engaged with the sides of the bars the
pressure is taken by the parts P thus relieving the pivot of the whole of the strain.
The outer ends R of the said jaws or lugs afford a ready means of disengaging
same with the sides of the bars.
It will also be noted that I may use the cam shaped jaws or lugs with the sash
cramp bar A if desired, and vice-versa.
As at present constructed these bars are often roughened or indented on the
upper surface Q, this damages the work that has to lie on the said surface; it will
be seen that by my invention the upper surface may be left perfectly smooth.
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 :-
1. The improved bar for use in sash or bench cramps having the side or sides of
parts thereof toothed, indented, milled, serrated, raised or otherwise roughened, as
and for the purposes herein described and substantially as illustrated by the
accompanying sheet of drawings.
2. The improved jaw or lug K as and for the purpose herein described and sub-
stantially as illustrated by the accompanying sheet of drawings.
3. The improved means of securing the feet of sash or bench cramps to the
bars by means of cam shaped jaws or lugs, loose parts or wedges (with or without

page_text: springs N or O) having their inner faces, or parts thereof toothed, indented, milled,
serrated or otherwise roughened to fit into corresponding teeth, indentations, &c. in
the sides of the bars as and for the purposes herein set forth and substantially as
illustrated by the accompanying sheet of drawings.
Dated this 5th day of October 1892.
W. SWINDELL,
Agent for the Applicant.