Improvements in or relating to Fret and like Saws.
Year: 1898

page_text: Date of Application, 28th Jan., 1898-Accepted, 12th Mar., 1898
Improvements in or relating to Fret and like Saws.
(A communication from ARTHUR JONES, Carpenter, and JOHN PAULSON DOMMERSNAS,
Carpenter, both residing at No. 3868, Cottage Grove Avenue, City of Chicago,
County of Cook, and State of Illinois, United States of America.)
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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 improvements in that class of saws used for cutting out
intricate patterns in boards or planks for ornaments, coping, and the like, or for doing
other curved or irregular work; and it consists in certain peculiarities of the
construction, novel arrangement and operation of the various parts thereof, as will be
hereinafter more fully set forth and specifically claimed.
The objects of the invention are to provide a saw of the above named character,
which shall be simple and inexpensive in construction, and which by reason of the
peculiar construction and operation of its parts will permit the saw-blade to be turned
in its bearings to any desired angle.
In the accompanying drawing, Figure 1 represents a view in side elevation, partly
in section, of a saw embodying the invention.
Figure 2 is an enlarged sectional view, taken on line 2, 2, of Figure 1, showing the
frame and the endless cable or cord for operating or changing the position of the
saw-blade.
Figure 3 is an enlarged view, partly in section, taken on line 3, 3, of Figure 1,
looking in the direction indicated by the arrows, showing a portion of the handle and
a part of the saw-blade.
Figure 4 is a perspective view of the endless cable or cord detached. And-
Figure 5 is a fragmental perspective view, showing a modification in the
construction of the frame.
A represents the frame, which may be made of any suitable size, form and material,
but preferably tubular, as in the present instance, and bent to form three sides of a
substantially rect-angular figure. The ends of the frame are secured in suitable
socket-pieces B, and B¹, each of which is provided in its upper portion with a slot b,
to receive a key C, secured in position between the lugs 61, on the socket-pieces, by
means of a screw c, used for tightening or clamping the said socket-pieces on the
ends of the frame. The keys C, are provided at their lower inner portions with
projections c¹, to enter slots a, in the ends of the frame A, to prevent the socket-
pieces turning thereon. The lower portions of the socket-pieces B, and B¹, are
formed or provided with prongs d, between which are located sheaves or grooved
pulleys D, and D¹, which are mounted on stub-shafts E, and E¹, journaled in the forks
or prongs d, of the socket-pieces. The stub-shafts E, and E¹, are each provided in
their free and inner ends with slots e, which terminate in enlargements e¹, to receive
the saw-blade F, and enlargements f, on the ends thereof.

page_text: The cable or cord G, as shown in Figures 1, 2, and 4, of the drawing, is passed
once and a half around each of the sheaves or pulleys D, and D¹, and then passes up
and through the frame A, and has its strands crossed, as shown in Figure 4 of the
drawing, on the upper portion of the frame. Secured to one of the stub-shafts and
usually that one E¹, located in the socket-piece B¹, is a handle H, which is used for
forcing the saw back and forth through the material to be sawed, and is also employed
for turning the blade to the desired position.
In Figure 5 is shown a modification in the construction of the frame, which may
sometimes be employed, instead of the cylindrical tubular frame shown in Figure 1,
and it consists of two pieces h, and h¹, the former of which fits within the latter, as
shown, and forms a hollow compartment for the reception and operation of the endless
cord or cable. When this modification is used, the socket-pieces may be formed with
rect-angular sockets to receive the ends of the frame, as is apparent.
The operation of the saw is simple and as follows:
The enlargements f, on the ends of the blade F, may be inserted into the enlarged
openings e, near the ends of the stub-shafts, in which position the said blade will be
held by reason of the tendency of the ends of the frame to spring outwardly. After
the blade shall have been thus fixed in the stub-shafts, it may be turned to any
desired position, by turning the handle, which will cause the pulleys to rotate by
reas of the cable or cord, which connects them.
In the event of the cable or cord becoming slack, through stretching or otherwise,
the ends of the frame extending into the socket-pieces may be moved outwardly,
until the cable is made taut, and held in such position by clamping the socket-pieces
thereon.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is :-
1. The combination of the frame, with the socket-pieces secured on the ends
thereof, the pulleys journaled in the said socket-pieces, a saw-blade secured to the
pulley-shafts, a handle secured to one of the pulley-shafts, and a cable connecting
and encircling the pulleys and being supported by the frame, substantially as
described.
2. The combination with the frame, having a slot in each of its ends, with a slotted'
socket-piece secured on each end thereof, a key secured in the slot of each of the
socket-pieces, the pulleys journaled in the said socket-pieces, a saw-blade secured to
the pulley-shafts, a handle secured to one of the pulley-shafts, and a cable connecting
and encircling the pulleys and being supported by the frame, substantially as
described.