Improvement relative to Metal-, Pruning-, and Stone-saws.
Year: 1894

page_text: Date of Application, 5th Feb., 1894-Accepted, 10th Mar., 1894
COMPLETE SPECIFICATION.
Improvement relative to Metal-, Pruning-, and Stone-saws.
I, CHRISTIAN KLASEN, Engineer, of Birlinghoven, in the Province of Rhineland,.
Prussia, 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 :-
Hitherto the spanning of these saws has been very troublesome, and more
especially it was impossible to make any further use of a blade that had been.
shortened by the breaking off of a piece.
My saw is intended to do away with these disadvantages.
In the annexed drawing this saw is represented in
Fig. 1 in a side view, in
Fig. 2 in a front view, in
Figs. 3 and 4 in a view from above and below.
The essential feature in my saw is the bow. It is a metal bow, consisting of two
parts A and B. Both parts are bent at an angle and form at the end of the shorter
side of the angle a fork a in which to fasten the saw-blade. The longer sides of
the parts A and B run for a certain length alongside or above each other and are
connected with each other in such a manner that the blade may be conveniently
spanned and also the width of span of the saw be shortened or lengthened
quickly and easily at any time, corresponding to the length of the blade. The
drawing shews the saw at its greatest width of span.
The part A of the bow has at C the bolt 6 turning on a pin a and having a screw-
thread for a considerable length at the end. This bolt passes through a long
fork-like slit c, closed however at the end, and formed at the end of the longer side
of the part B of the bow. The end of the longer side of the part A. is bent off at
au angle and in a direction opposite to that of the shorter side and terminates in a
fork in which the longer side of the part B rests edgeways. The middle part of
the longer side of B is provided lengthways on its broad side with a slit e, whose
length corresponds to that of the fork-like slit c. A bolt, having at one end a
screw-thread and thumb-nut, passes through the slit e and thus connects the two
ends of the fork d with each other.
The working of this arrangement of the saw-bow is very simple and clear.
By simply tightening the thumb-nut g on the bolt 6 one effects a spanning of the
saw-blade, as the part of the bow B, turning about the bolt f, acts as a double-
armed lever, thus causing the two bow ends with the forks G G, when the
thumb-nut 9 is tightened, to move away from each other. On loosening the
thumb-nut and that of the bolt, the two parts A and B may, as far as the length
of the slits c and e allow of it, be easily pushed towards each other, thus altering
the width of span of the saw at will.
g
The blade D is fastened to the heads E E which lie moveable in sockets FF so
that the blade can also be turned and used for sawing in an upward direction.
The sockets F F lie moveable about pegs h h in the forks GG, an arrangement,
which on account of the slight change of direction taking place in spanning the
saw-bow is preferable, having regard to fractures, to a rigid fastening. Of course
the fastening of the saw may be done in any other way that is desired.
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 1
claim is:
Improvement in metal-, pruning- and stone-saws, consisting on the one hand in

page_text: the division of the metal-bow into two angle-pieces A and B, arranged in such a
manner with regard to each other, that B rests moveable about the bolt f in the
fork d at the end of A, while the one end of B is drawn nearer to A by the
tightening of the thumb-nut g on the bolt b fastened to A, and thereby the forks G
and G made to move away from each other, on the other hand in the arrangement
of longitudinal slits c and e in the bow B, allowing the bolt b or to pass through
and thereby a sliding towards each other of the parts A and B for the length
of the slit.
Dated this 25th day of January 1894.