US1425152A - Electrically-operated saw - Google Patents

Description

B- -D. VIERS'.

ELECTRICALLY OPERATED SAW.

APPLICATION men us. 23. 1921.

1,425,152. PatentedAug. 8,1922;

attorney scan a were; am LODGE, mam

v nracmrcamy-oramransaw.'

. spccificafiqeof tp Pa c Patented Aug. 8,

Application filed February 23, 1921. Serial No. 447,004.

To all whom it may concern Lodge, in the county of Carbon, State of lVIontanm'have invented certain new and useful Improvements in Electrically-Operated Saws; and I do hereby declare the following to be a full,'clear, and exact description of the invention, such as will enable others skilled in the art to (which it apper tains to make and use the same.

i This'invention'relates tonew and useful improvements in sawsand particularly to hand saws.

Qne object of the invention is to provide a hand'saw which is electrically driven,

and which can be easily and quickly ad justed to rotate in either direction.

Another object is to provide an electrically driven saw which is provided with a novel form of gageby means of which a 1 piece may be sawed from a board without theuse of a "square or mark on the board as a guide. l v Another object is to provide an electrically operated saw which has means for preventing the saw from dropping into the kerf and hanging or sticking.

Other objectsyand advantages will be ap parent from the following description when taken in connection with the accompanying drawing.

, In the drawing:

Figure l is a slde elevation of a saw made in accordance with the invention.

Figure 2 is a top plan view of the same.

3. Figure 3 IS a SMVHUOH viewed from the opposite side from that of Figure 1, to

showthe Irrangement of the gage.

Figure-4 is a sectional detail of the handle I of the saw, showing the circuit closer.

' Figure 5- is an, enlarged vertical sectional view,through the saw shaft, to show otherof the smaller gears inmesh with the Referring particularly to the accompanyingi drawing 10 represents a casing in WlilCh is mounted the electric motor, the shaft of said motor extending forwardl from the frontend of the casing, throug a. bearing '11. The motor shaft is representedby the numeral 12. Encasing the shaft 12 is a tube 18, which extends to and is connected 5 with an angular-housing 1 f, said shaft 12 extending into the housing where it is pro- I vided with a bevel gear 15. On the tube 13, Be it known that Bl'lili l). Vnzns, a citi -zen of the. United States. residing. at Red between the motor casing and the housing, is formed a hand grip l(5,"and a disk shield 17,'whichis adapted to be grasped by one hand of the user. motor casing, "and extending downwardly and rearwardly therefrom, is a pistol grip 18 through which pass the wires 19 to the motor. the other ends of the wire being provided with the usual screw plug for engagement in the socket of an ordinary electric light iiiiture."()ne ofthewircs is separated within the grip 18, andtlieends connectedltotwo adjacent contact members 21 and 22 for engagement by the spring member 23, carried by the inner end' of the sliding plunger 24. This plunger is disposcd through the. forward side'of the pistol grip 18, and hasa finger piece -18 on its outer or forward end which is arranged to be engaged by the linger of the user so; that upon ment in two openings in the circular saw blade 27, nuts 28 being engaged on the furcations to retain the saw in position. The shaft 26 is supported in suitable bearings 29, carried by the housing. ()n the shaft 26 is splined a sleeve 30', on the ends of which are secured two smaller bevel gears 30 and 31, so spaced apart that only one at a time may be meshed with the larger gear 15 when the sleeve is moved longitudinally on the shaft.' To maintain either of the gears inmesh with the large gear a split collar 32 is. engaged around the shaft 26, between either gear 30 or 31, and the adjacent side wall of the housing. Thus the large gear 15 will drive the shaft 26 in either direction to rotate the saw in the direction desired by the user;

Carried by the lower portion of the hous- On the rear end of the ing-M, and extending from the side opposite to that of the saw, is a graduated bar 32', said bar being preferably flat on the upper side and rounded on the lower side and on the said upper flat face are forays, and

fractional inch graduations. A member or bar 533. having the enlargements 34 and 35 at its opposite ends is arrallged to he slidably adjusted on the said bar 32. The enlargement 35 is formed with an approximately triangular opening 35 therethrough for the reception of the bar 3'2, a screw 36 being disposed through the upper side of'the enlarg nent tor engagement in the upper face of .Lhe bar to maintain the member 33 in different adjusted positions alongthe bar. Rotatably carried by the lower portion of each of the enlargements 3st and is a verticallyalisposed.roller 37 which rollers are adapted to heanagainst the side or end edge of a board to be cut, \vhile the saw is making its rut, said rollers serving to maintain the saw in proper position. so that it will cut on a straight line parallel-with the edge or end of the board, withoutthe necessity of using a square, or making a mark on the board.

Carried by the lower side of one side wall of the housingls ,is a roller 38 which is adapted to roll on the face of the board to hold the saw against going too deep into the kerf, when starting the sawing, and While proceeding along the board.

In the operation of the saw, the operator first adjusts the gage 33 along the bar 32 to the graduation on said bar representing the distance from the end or side edge of the board the saw is to cut. The operator then grasps the pistol grip in the hand, and after placing the cutting edge of the saw against the board, presses the plunger 24:.inwardly to close the circuit, When the motor Will drive the saw. The device is then moved forwardly, with the rollers 37 against the side or end edge of the board, and the roller 38 on the upper face of the board, until the' sawlms (-ut therctln'ough, throughout the length or width oi the board, as the case may be.

The plunger Qt is normally held out of circuit closing position by the coil spring thereof, thus requiring the operator to hold the plunger inwardly while the saw is in operation. and perinitting the plunger to automatically move out of circuit closing position when pressure thereon is relieved.

By means of the removable spacing collar 32, either of the gears 30 or 31 may be maintained in mesh with the gear 15,, so that, the saw may rotate in the direction desired by the operator.

What is claimed is:

In an electrically operated saw, a pistol frame supporting a motor and adrive sha l t driven by the motor, a frame on the outer end of the pistol frame, a transverse shaft mounted in the last-named frame and carrying a saW' on one end thereof, a transverse bar carried by the same frame and projecting from one side of the frame, an angularlyextending arm mounted for longitudinal slidable adjustment on the bar and carryingrollers rotatable on vertical axes, rollers rotatable on horizontal ax'es on the said last-named frame, and means-for controlling the circuit to the. motor,

In testimony whereof, I aflix my signature, in the presence of two Witnesses.

HARRY VIERS, Emmi DOUGLASS.

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