Improvements in Mitre-clamps.
Year: 1894

page_text: Date of Application. 3rd Sept., 1894-Accepted, 6th Oct., 1894
COMPLETE DI MUITIVAT
Improvements in Mitre-clamps.
I, FREDERICK WILLIAM HEDGELAND, of No. 381 South Oakley Avenue,
Chicago, Illinois, United States of America, Artisan, do hereby declare the nature
of my invention, and in what manner to be performed to be particularly described
and ascertained in and by the following statement :-
Figure 1 is a plan showing a practical application of the device;
Figure 2, is a view in perspective of the device proper.
and
This invention relates to improvements in miter-clamps and has for its object to
provide a simple and efficient device of this character whereby the uniting faces
of a miter are uniformly and evenly drawn together to form a close joint, and
locked in that position until permanently fastened.
This clamping-device will be found especially useful in the manufacture of
picture-frames, but is also adapted to be used in uniting the meeting ends of various
kinds of moldings, either when uniting at right angles or at any other angle and
matching together in a line bisecting the angle of junction.
The device consists of the companion levers A A, the clamping-blocks B B, and
the internal corner block or wedge C.
The inner ends of the levers are connected together by the pivot-bolt a.
The triangular clamping-blocks are loosely connected to the outer ends of the
levers by the pivots a a'. The clamping-blocks represent two equal parts of a
square figure divided corner-wise and pivoted to the respective levers so that when
in use the longest side of the triangle is brought in contact with the outer edges of
the joining pieces of molding, D D, shown in Fig. 1, and when a pressure is applied
they draw toward the corner of the miter.
The wedge-block, C, is of a triangular form, the edges, bb, bearing against the
inner sides of the molding pieces, corresponding to the angle of junction. This
wedge-block is provided with the stem-extension, 61, through which is inserted
the pivot-bolt a, forming a common jointed connection with the joining ends of the
levers.
The levers are each provided with a number of perforations, d, and the stem
of the wedge-block with corresponding perforations d'. This provides for the
adjustment of these parts with relation to each other and in accordance with the
width of the molding. A clamp of the ordinary or medium size is capable of an
adjustment embracing molding from one-half up to four inches in width,
When the different parts are properly adjusted or set with reference to each
other, and a pressure is brought to bear on the sides of the clamping-blocks, the
plane of which is parallel to that of the line of junction, the meeting ends of the
molding are brought evenly together making a very close joint.
The wedge-block is drawn into the corner to a uniform bearing by the action of
the other parts so that there is no possibility of an over-projecting edge at any
point along the miter-joint.
The ordinary hand screw-clamp, E, shown in Fig. 1, is preferably used in
applying the required pressure.
The bearing-surface, having contact with the molding, may be covered with
some suitable flexible substance, such as thin rubber or the like, to prevent defacing
finely finished work.
The joining ends of the miter are permanently secured together in the usual
manner, that is, by nails, brads, or some adhesive composition.

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-
1. In a clamping-device of the class described, the combination of the companion
levers, pivoted together at their inner ends, the clamping-blocks, pivoted to the
outer ends of said levers, and a wedge-block, adapted to fit the inside corner of
the miter-joint, substantially as set forth.
2. In a clamping-device of the class described, the combination of the companion
levers, pivoted together at their inner ends, the triangular blocks, pivoted to the
outer ends of said levers and adapted to bear against the outer edges of the miter-
joint, and the wedge-block or inside corner piece, having a pivotal connection
common with the connected ends of said levers, substantially as set forth.
3. In a clamping-device of the class described, the combination of the companion
levers, provided with a number of perforations in their joining ends, the clamping-
blocks, adjustably connected to the opposite ends of said levers, the wedge-block,
, provided with a perforated stem-extension, and joined to the connecting ends of
the clamping-levers by the same pivot-bolt, substantially as set forth.
Dated this 17th day of August 1894.
FREDERICK WILLIAM HEDGELAND.
.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.