Improvements in and relating to Fret-saw Frames.
Year: 1898

page_text: Date of Application, 22nd Apr., 1898-Accepted, 9th July, 1898
COMPLETE SPECIFICATION.
Improvements in and relating to 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 fittings for fret-saw frames, said fittings being in-
tended to be secured to the ends of the metal frame, so as to carry the saw clamping
devices; the invention also relates to a shackle fitting for the saw clamping
devices. The object of this invention is to produce fittings of this character
which are strong and comparatively cheap to make and are made without brazing
or soldering.
In the accompanying drawings Fig. 1 shows the blank for the top fitting;
Figs. 2 and 3 are side elevation and plan of the top fitting partly made; and
Figs. 4 and 5 are similar views of the top fitting when finished. Figs. 6 to 10
are corresponding views of the bottom fitting; Fig. 11 shows the blank for
the shackle fitting; Figs. 12 to 14 are edge views showing the manner of making,
and Fig. 15 shows same finished and fitted with a clamping screw eye f; Fig. 16
is an elevation showing part of a fret-saw frame with our new fittings.applied
thereto. The same letters of reference where they occur are used to denote the
same or corresponding parts in all the figures.
The blanks A and B and F are stamped out to the required shape as shown
in Figs. 1, 6 and 11 respectively, they are then stamped or pressed and by
suitable dies formed to the partly made shapes shown in Figs. 2 and 3, 7 and 8,
and 12, 13 and 14 respectively. The central square aperture b in the blank B
may either be stamped out when the blank itself is stamped from the sheet or
it may be done at the time when the web b₁ is turned over at right angles and
the blank sides shaped there-around as shown in Figs. 7 and 8. The fittings A
and B are finished by stamping or pressing in another machine having suitable
dies so as to press in and form parallel sides and bring the fittings to the finished
shapes shown in Figs. 4 and 5 and 9 and 10 respectively. These fittings A
and B are secured in any suitable manner to the upper or lower arms of the
frame (see Fig. 16) so that the square aperture a formed in the upper fitting A
is in line with the central square aperture 6 in the bottom fitting or boss B.
Through these apertures a and b are passed the saw clamping and tension
adjusting devices D and E and these latter are secured in the ordinary way.
The shackle fitting F is finished by drilling and tapping a hole through the
overlapping edges shown in Fig 14 to take the screw eye f as shown in Fig. 15.
This shackle fitting is passed as a collar over the jaws of the fret saw holder D
and E (see Fig. 16) which jaws are tightly clamped by screwing up the screw
eve f

page_text: 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:-
1. A top fitting for fret-saw frames made by stamping and pressing a blank
between suitable dies so as to provide a central square aperture to carry the
saw clamping and tension adjusting devices and two parallel sides whereby the
fitting can be secured to the upper arm of the metal frame substantially as
described with reference to Figs. 1 to 5 and Fig. 16 of the accompanying
drawings.
•
2. A bottom fitting or boss for fret-saw frames made by stamping and pressing
a blank between suitable dics so as to produce a partially cylindrical boss having
a central square aperture in its upper or closed end and two parallel sides whereby
the fitting can be secured to the lower arm of the metal frame substantially as
described with reference to Figs. 6 to 10 and Fig. 16 of the accompanying
drawings.
3. A shackle for clamping fret-saw in the frames made by stamping and
pressing a blank between suitable dies so as to produce a collar to fit over the
jaws of the fret-saw holder, the jaws being tightly clamped by means of a screw,
substantially as described with reference to Figs. 11 to 16 of the accompanying
drawings.
4. Fittings for fret-saw frames constructed substantially as described.
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for the Applicants.