Power-driven handsaw.

Application filed June 6,1912. Serial No. 702,097.

To all whom it may concern:

Be it known that I, Ethan I. Dodds, a resident of Central Valley, in the county of Orange and State of New York, whose post5 office address is Central Valley, New York, have invented a new and useful Improvement in Power-Driven Handsaws, of which the following is a full, clear, and exact de- scription, reference being had to the accom10 panying drawings, forming part of this specification, in which:

Figure 1 is a side elevation of one form of my improved power driven saw, showing the device when in use. Fig. 2 is a similar 15 view-from the opposite side thereof. Fig.

is a view similar to Fig. 1, showing the position of the parts when the saw is not in use. Fig. 4 is a sectional view on the line IV—IV of. Fig. 3. Fig. 5 is an end view;

and Fig. 6 is a perspective view showing the device in use, to which I have -attached a modified form of gage.

. This invention relates to an improvement - m power-driven hand saws, and is designed 25 to provide a cheap and efficient device which can be readily handled by the operator, and which can be used for ripping, crdss-cuttmg, or slotting.

. Another object of my invention is to pro30 vide a device of this character in which the saw is guarded at all times, whether in use or not in use, and in which a supplemental guard is arranged to cover the saw when the device is laid down.

.Another object of my invention is to provide a straight edge which is arranged to hold the saw in such a position that it will cut in a straight line.

The precise nature of my invention will 40 be best understood by reference to the accompanying drawings, which will now be described, it being premised, however, that various changes may be made in the details of construction and general arrangement of 45 the parts, without departing from the spirit and scope of my invention as defined'in the appended claims..

In the drawings, the numeral 2 designates the sides of the frame. Journaled within 60 these sides are the shafts 3 and 4; the shaft.

having connected thereto, the armature and commutator of an electric motor. Connected to one end of shaft 3 is a pinion 5, which meshes with the gear wheel 6 on the shaft 4, and connected to the shaft 4 55 adjacent to the gear wheel 6 is a circular saw 7.

⁸ is a casing for the motor, which is connected to the sides 2, and 9 is a shield for a portion of the saw, and which is also con- 60 nected to one of the sides 2.

Pivotally mounted on the end of the shaft 4, adjacent to the shield 9, is a guard 10 which is adapted to be swung about the shaft τ>· manner hereinafter described. 65 Pivotally connected to the guard 10 is a link 11, the upper end of which is provided

Pjⁿ which extends through a longitudinal slot 13 in the side 2, adjacent to the shield 9. This side 2 is also provided 70 with a hand hole 14 and a handle 15, which form a hand hold for the operator. The lower face 16 to the last mentioned side 2 is horizontal and is arranged to form a seat to rest on the block or board which is to be 75 sawed, and connected to the reap end of this side 2 and in line, with the saw 7 is a straight edge 17, the thickness of which is about ^erP^al *° the thickness of the saw blade.

The straight edge 17 shown in Figs. 1 to 80 3 extends below the saw; while the straight edge shown in Fig. 6 does not extend to the lower edge of the saw, but is used only when it is desired to use the saw for slotting purposes. 19 and 20 designate screws which 85 are arranged to connect the motor to any suitable source of current, one of these contacts being connected to the motor directly, while the other contact is in electrical connection with a contact 21. The contact 22 90 adjacent thereto is connected to the motor.

is a switch member which is connected to the pin 12 on the link 11, and is arranged to slide between the contacts 21 and 22 when the link 11 is operated to raise the 95 ’ guard, as shown in Fig. 1 of the drawings 24—24 designate holes in the side 2 adj acent, to the shield 9, which are adapted to receive screws for securing thickness blocks 30 the lower face of said side 2 for determin- ioo mg the depth of the cut of the saw 7.

25—25 designate lugs on said frame 2 laving an opening therethrough for receiving a hook on a suspension chain or wire, so that the device can be used as a swinging 195 saw.

When the device is not in use, the parts are in the position shown in Fig. 3 of the

1,103,018 drawings,' and when it is desired to use the saw, the frame is grasped by the hand in the manner shown in Fig. 1, and the link 11 is moved forward by means of a thumb engag5 ing the pin 12 which will raise the guard 10 and close the circuit through contacts 22 and 23, so that the two poles of the electric motor will be in connection with the source of electrical power, and will be rotated thereby. The rotation of the shaft 4 will rotate the saw through the medium of the gears 5 and 6. The saw is then advanced toward the piece shown at 26 in Figs. 1 and 6, the seat 16 resting on the top of the piece. As soon as the saw has been advanced a distance equal to one-half of its diameter, the straight edge 17 will enter the slot and cause the saw to travel in a straight line. As soon as the pin 12 is released by the thumb the guard 10 will be returned by gravity and cover the exposed portion of the saw, at the same time the movement of the member 23 will break the circuit to the motor. . .

The ad^- uitages of my invention result from the provision of a power driven hand saw which is provided with means for holding the saw in a straight line; and from the further provision of means of simultane80 ously cutting off the power to the motor and moving the guard to cover the exposed portion of the saw.

It will readily be understood by those familiar with the art that I can use a water motor instead of the electric motor; the controlling valve of each will be controlled by the link 11, which controls the movement of the guard.