Improvements in and connected with Saws.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with Saws.
I, GUSTAV NELLES, Koln-Ehrenfeld, in the Province of the Rhine, German
Empire, Manufacturer, do hereby declare the nature of this invention to be as
follows:
:-
My invention relates to improvements in and connected with saws, more par-
ticularly in regard to the spanning of the saw in the frame.
Hitherto the drawing of the saw blade rigid in the frame has been generally
effected in two lever frames by the employment of a piece of hemp-rope or a
number of similar cords, these parts being passed several times round the ends or
extremities of the frame and the cord then twisted by the insertion of a short
rod, the consequent tension producing a certain rigidness of the blade.
This system, however, has been found to possess many disadvantages amongst
which the rapid fraying or cutting of the cords and also the not unfrequent snap-
ping of the saw blade when too much tension is imparted.
To obviate the above is the object of my invention and I attain this by a device
which I describe with reference to the accompanying drawings, in which:
Figure 1 is a front elevation of my improved device,
Figure 2 is a plan of Figure 1, and
Figures 3-5 show my device in enlarged proportions and in different positions.
To one end of each of the side-pieces ab (Figure 1) of the frame, the saw
blade is as usual connected in an approved manner whilst at the opposite ends
of the frame instead of the before mentioned rope or cords I substitute. my
improved device.
Said device has rods e of suitable dimensions and adjustable, as regards their
length within the interior of the frame by means of fly-nuts or wing-nuts, for
the purpose of regulating the tension, that is to say, the tension on the frame, and
on the saw blade may be lessened or increased as may be required.
The rods e are provided with pieces f, Figure 5, preferably of annular shape
and by means of suitable openings the same are pivoted at g.
One of the rods e is provided with a handle i also pivoted at g. It will be seen
that by moving the handle i the rods e are caused to alter in relative position to
each other, which effects either a decrease in tension in the one case or in the
opposite case, a tightening of the saw-blade according to the direction in which.
the handle is rotated.
The especial characteristic of the regulation of the length and tension of the
rods e by means of the before mentioned wing-nuts is an important feature of
my invention, as the same is more simple in operation, and cheaper than any
previous device and also has the advantage that the same can be applied to any
existing saw frame.
Dated this 26th day of July 1897.

page_text: I, GUSTAV NELLES, Koln-Ehrenfeld, in the Province of the Rhine, German
Empire, Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
My invention relates to improvements in and connected with saws, more par-
ticularly with regard to the spanning of the saw in the frame.
Hitherto the drawing of the saw blade rigid in the frame has been usually
effected in double arm frames either by employing one piece of hemp-cord or by
a number of cords; these cords being passed several times round the ends or
extremities of the frame and then twisted by the insertion of a short rod, the
consequent tension producing a certain rigidness of the blade.
This system, however, has been found to possess many disadvantages amongst
which may be mentioned the rapid fraying or cutting of the cords and also the
not unfrequent snapping of the saw blade when too much tension is imparted.
To obviate the above is the object of my invention and I attain this by a device
which I describe with reference to the drawings left with the Provisional Specifi-
cations, in which:
Figure 1 is an elevation of my improved device,
Figure 2 is a plan of Figure 1, and
Figures 3-5 show my device drawn to a larger scale, and in different positions.
Proceeding to describe the drawings I remark, that the saw-blade is first placed
in position between each of the horns or arms a b (Figure 1) of the frame, the
said saw-blade being then fastened or secured in any approved manner whilst
opposite to the saw and at the edge of the frame instead of using rope or cords,
I employ the improved device, as hereinafter described.
My improved device consists firstly of rods e of suitable dimensions and adjust-
able, as regards their length within the interior of the frame by means of fly- or
wing-nuts, for the purpose of regulating the tension, that is to say, the tension
both on the frame, and in the saw blade may be varied to a greater or less extent,
as may be required.
The rods e are provided with end pieces f, Figure 5, preferably of annular
shape. Furthermore I employ a disc h to which is attached a handle i. Each of
the ends are now caused to encompass separate pins g, said pins passing
through the parts f and the disc h in the manner clearly shown in Figure 5. It
will be clear that when the handle i is turned, the rods e alter in relative position
to each other, which effects either a decrease in tension in the one case or, in the
opposite case, a tightening and increased tension of the saw-blade according to
the direction in which the handle is revolved.
Lastly I repeat that the regulation of the length and tension of the rods e by
means of the before mentioned fly- or wing-nuts is an important feature of my
invention, my improved device being more simple in operation and cheaper than
any previous device and possessing furthermore the advantage that the same can
be applied to any existing saw frame.
Having now particularly described and ascertained the nature of this
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
A device to hold in tension the saws of double-arm saw frames, said tension-
device consisting of two adiustable rods (e). attached to the arms or horns (a b)

page_text: of the saw frame, said rods (e) being caused to approach, or, recede from each
other, by means of a disc (h), attached to a handle (1), substantially and for the
purpose as described.
Dated this 27th day of April 1898
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents for the Applicant.