Improvements relating to Clamps for Fret-saw Frames.
Year: 1897

page_text: Date of Application, 30th Sept., 1897-Accepted, 6th Nov., 1897
COMPLETE SPECIFICATION..
Improvements relating to Clamps for Fret-saw Frames.
We, HOBBIES, LIMITED, of 12 Paternoster Square, in the City of London, and
HERBERT JEWSON, of East Dereham, in the County of Norfolk, Engineer, 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 clamps for holding the saws in fret-saw frames which
can be produced at less cost, will be more durable and will hold the saws more
firmly than devices of this character as heretofore made and used.
In the accompanying drawings Fig. 1 is a side elevation of a clamp made
according to this invention and adapted to be fitted into the handle of a hand
fret-saw frame, and Fig. 2 is an end elevation of same; Fig. 3 is a side elevation
of same showing the two parts separately, and Fig. 4 is a side elevation of part
of the clamp used for holding the saw at the upper end of the frame.
To make the clamp shewn in Figs. 1 to 3 a piece of steel or other suitable metal
of twice the length and half the thickness of the finished clamp, is taken and
folded over on itself in the middle so that the two ends a and b come together
as shown in Fig. 3. The inner faces a¹ and b₁ of these two ends are file cut,
stamped with depressions and projections or otherwise roughened so as to form the
roughened faces or cheeks between which the end of the saw is gripped. The
outer face of one of the ends is undercut or recessed, as shown at 62, to receive
the saddle piece C, which latter is provided with a thumb or set-screw D engaging
in a female thread formed in the upper part c of said saddle piece. An external
screw thread a² is formed on the closed end of the folded metal piece, and this
thread is engaged by the nut on the boss at the lower end of the handle, by which
the clamping device is secured in the handle in the well-known manner.
When the clamp is secured in the handle and the saddle piece C is in position
in the undercut or recess 62, the saw is secured in this clamp by slacking back
the screw D, the end of the saw is then inserted between the roughened faces a¹
and and the screw D is tightened up so that its forward end bears on the
back of the cheek a pressing same down close on the cheek 6 which latter bears
on the inner face of the saddle C in the position shown in Fig. 2.
The clamp for the upper end of the saw, as shown in Fig. 4, is made from
one piece of metal folded in the middle. This clamp is roughened on the interior
and is provided with an undercut or recess in which is fitted a saddle C con-
structed and operating in the same manner as the saddle already described with
reference to Figs. 1 to 3. This clamp may be externally threaded and provided
with a wing nut and fitted in the upper arm of the frame so that the tension
on the saw may be adjusted in the ordinary manner, or it may be fitted in the
frame and provided with a tension-adjusting device such as is described in the
Specification of our Patent Application No. 17006 of 1897.
When the nut D is slacked back the springness of the bent over metal piece
will cause its ends a and b to separate in the saddle, thus preventing the latter

page_text: from leaving the recess or undercut 62 and sliding longitudinally over the
ends a and b.
It is obvious that the clamping devices which form the subject of this inven-
tion are applicable to either hand or machine frames; also that instead of making
them from one piece of metal bent over on itself the parts a and b may by two
separate pieces of metal of equal length if so desired.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is: -
A clamp for holding the saws of fret-saw frames consisting of two cheeks, one
of which is recessed, and a saddle enclosing said cheeks and fitting into said
recess and carrying a thumb or set screw for compressing said cheeks together
in said saddle substantially as described with reference to the accompanying
drawings.
001
1
P a
1
100%
F. W. GOLBY,
36 Chancery Lane, London, W.C., Patent Agent for the Applicants.