IMPROVEMENTS IN SCREW CLAMPS
Year: 1884

page_text: COMPLETE SPECIFICATION,
I WILLIAM ROBERT LAKE of the firm of Haseltine Lake & Co Patent Agents
Southampton Buildings in the County of Middlesex do hereby declare the nature
of said Invention for "IMPROVEMENTS IN SCREW CLAMPS" 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 screw clamps and comprises improvements in the clamp
described in the Specification of United States Patent granted to the communicator
of this Invention and dated January 22, A.D. 1884 N° 292207, and it consists
essentially in the employment of a slide of peculiar construction provided with a
set-screw, in combination with the parts described in the said Specification, whereby
one screw head-stock is enabled to serve for clamping several bodies, thereby
reducing the aggregate cost of manufacture when several clamps are required, and
rendering the implement more useful and effective than those of ordinary
construction.
In the accompanying Drawing,
Figure 1 is a perspective view of the improved screw-clamp.
Figure 2 is a side elevation showing a modification of the same..
Figure 3 is an end elevation of the head-stock shown in Figure 2.
Figure 4 is an end elevation of the head-stock shown in Figure 1.
Figure 5 is an end elevation of the slide; and
Figure 6 is a vertical longitudinal section of a portion of the head-stock shown
in Figure 2.
Similar letters of reference indicate corresponding parts throughout the
Drawing.
A indicates the body of the clamp, B the head-stock, and C the tail-stock.
The body is provided on either side with a longitudinal groove m running its
entire length, and on its top with two series of holes g, h.
The head-stock consists of two downwardly projecting flanges or side-pieces E
provided with inwardly projecting studs d working in the grooves m, which flanges
or side pieces are connected by the horizontally arranged cap or body F provided
with two upwardly projecting flanges G, G.

page_text: Mounted horizontally in the head-stock B, and fitted to work in correspondingly
threaded holes b in the flanges G, is a screw-shaft J, provided with the handle or
lever L at its outer end, the said shaft being engaged with both flanges G, thereby
gaining greater strength and directness of movement than would result from its
engagement with a single flange. I do not however confine myself to the use of
both Hanges, or to threading the holes in both when two are used, although I deem
two preferable to one for the reasons stated.
The tail-stock C consists of two downwardly projecting flanges or side-pieces M,
connected by the cap or body N, which is provided at its inner end with an
upwardly projecting flange or face-plate Q, and with a brace t abutting against the
outer fuce of the flange Q.
The holes g incline slightly towards the centre of the body A; the holes h are
also inclined towards the centre of the body but in a direction opposite to that of
the holes g.
The head-stock and tail-stock are each provided with a centrally arranged
downwardly projecting stud ; the stud in the head-stock being properly inclined
and otherwise adapted to enter the holes g, and the stud in the tail-stock fitted to
enter the holes h, thereby enabling the stocks to be secured in any desired
position on the body.
In Figure 2 a modification of the clamp is shown which is preferable for some
kinds of work, the modification being described as follows, that is to say:-
Projecting downwardly-and-backwardly-from-the-forward-end-of-each-side-piece-E-
of the head-stock B, and on the inner face thereof, is a tooth or dog P, adapted
to enter a corresponding mortise or slot z cut in the side of the boly A, the slot
inclining toward the tail-stock end of the clamp, as shown. A like tooth or dog P
projects downwardly and backwardly on the inner face of each side-piece Al of
the tail-stock C, and is adapted to engage in a mortise or slot y, also formed in the
side of the body A, but inclined towards the head-stock end of the clamp, or in an
opposite direction to the mortise 2.
In using the clamp shown and described in the said United States Specification,
and also ordinary clamps of this character, for gluing up cabinet work and for
similar purposes, it is necessary to leave the work in the clamp until it "sets," thus
necessitating the use of a head-stock to each body.
The present Invention is designed to obviate this objection, and to this end I
make use of the slide K, which is mortised to fit the top of the body.A and
provided on either side with an inwardly projecting flange working in the
groove m, and also on its top with the vertically arranged flanges or face-plates R, S,
as shown. The slide is also provided with a set-screw T which is fitted to work in
a correspondingly threaded lioler and engage with the body A, thereby enabling
the slide to be secured in any desired position.
In the use of my improved clamp, the body A is placed on any convenient bench
or support and its bend-stock adjusted as shown, the pin of the said stock being
in one of the holes g, and the studs d in the grooves m.
The work to be glued or
otherwise operated upon is then placed across the top of the body or stock A,
between the tail-stock C and slide K, and the tail stock moved up as closely as
possible to the article to be clamped, the studs d of the tail-stock being also in the
grooves m. The pin or stud in the tail-stock is then pushed down into one of the
holes h, and the screw J is turned in by the handle L, causing the work to be
grasped or clamped between the slide K and tail-stock C in a manner which will
be readily obvious without a more explicit description. After the work is clamped
between the tail-stock and slide, as described, the screw T is turned down forcibly
onto the body A, thereby firmly securing the slide in the position in which it stands
at the time. The screw J is then turned back, and the head-stock removed from
the body for use with another clamp.
For doing small work, two or more slides may be used with each clamp it
necessary,

page_text: It will be obvious that when a piece of work is clamped between the tail-stock C
and slide K, and the slide secured by the screw T, another piece of work may also
be clamped between the head-stock and slide if desired.
A loose guard or cap H is fitted to the inner end of the screw to prevent injuring
the work; this, however, will not be required unless the work is clamped between
the head-stock and slide.
The pins and the teeth or dogs P, being inclined and respectively hooking into
corresponding holes or mortises in the body A, prevent the inner ends of the stocks
from rising or riding upwardly when a great strain is exerted on the screw J, or in
doing heavy work.
The stocks being respectively pivotted on the studs d, their inner en s nay be
readily raised to enable the work to be inserted to better. advantage.
Instead of the flanges v, the slide may, if preferred, be provided with a stud on
either side projecting into the grooves m.
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
First. In a clamp, substantially such as described, a slide adapted to be moved
to and fro along the body of the clamp between the head and tail-stocks, the said
slide being provided with means for keeping it in engagement with the body and
with means for securing it in any desired position thereon, substantially as, and for
the purpose, set forth.
Second. In a clamp, substantially such as described, the slide K provided with
the flanges and the screw T, in combination with the body A, the tail-stock C,
the head-stock B, and the screw J, all constructed, combined and arranged to
operate substantially as specified.
Third. In a clamp, substantially such as described, the slide K provided with
the face plates R, S, the screw T and the flanges v, substantially as set forth.
Dated this 27th day of March 1884.
HASELTINE, LAKE & Co.,
For the Applicant.