US1424593A - Electrically-operated handsaw - Google Patents

Description

C. SANDLIN.

ELECTRICALLY OPERATED HANDSAW, BUFFER, ETC.

APPLICATION'.F ILED MAR l, 1920.

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C. SANDLIN.

ELECTRICALLY OPERATED HANDSAW, BUFFER, ETC.

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ELECTRICALLY OPERATED HANDSAW, BUFFER, ETC.

APPLICATION FILED MAR. I, 1920- 1,424,593. Patented Aug. 1, 1922.. v 3 SHEETSSHEE] 3 avwewtoz Charlaa Eanrfllin UNITED STATES PATENT OFFICE.

CHARLES SANDLIN, 0F.DE1\TISON, TEXAS.

nLEcTRroALLY-orERArnnrmimsaw, BUFFER, ETC.

Specification of Letters Patent.

Patented Aug; 1', 1922.

Application filed March 1, 1920. Serial No. 362,419.

of Texas, have invented certain new and useful Improvements in Electrically-Operated Handsaws, Buffers, Eta, of which the following is'a specification.

This invention relates to tools, and the primary object of the invention is to provide an improved power operated portable tool, which can be effectively used for a number of purposes, such as sawing, grindstand;

ing, polishing and the like.

Another object of the invention is toprovide an improved portable power operated tool embodying a guiding base hingedly carrying the tool and operating parts, the base being detachably secured to the tool,

so as to permit the free use of the tool withing an operating handle at one end there of, and a bearing sleeve at the opposite end thereof, the bearing sleeve supporting the operating shaft for the tool and having a guard for the tool associated therewith.

A further object-of the invention is to provide an improved type of hand guard for the bearing sleeve, so as to permit the operator to grasp the sleeve for holding the tool in engagement with the work without danger of coming into contact with the tool.

A still further object of the invention is to provide an improved electrically operated portable toolof the above character which is durable and efficient in use, one that is simple and easy to manufacture, and one which can be placed upon the market at a reasonable cost. o

Other objects and advantages of the invention will appear in the following detailed description, taken 'in connection with the drawings, forming a part of this specification, in which drawings:

Figure 1 is a side elevation of the improved tool, showing the same in its lowered adjusted position for engaging the work.

being removed;

Figure 2 is a horizontal longitudinal section through the improved tool showing parts thereof in plan, the guardfor the saw Figure 3 is a vertical longitudinal section through the improved tool showing parts thereof in elevation, the'saw being shown in raised positionout of-engagement with the work.

t Figure 4 is a detail plan view of the guiding base, the motor and associate parts being shown removed. I

Figure 5 is a bottom plan view of the Figure 6 is an enlarged fragmentary plan view of a portion of the base showing the scale carried by the basefor indicating the depth of the penetration of the saw in relation to the work.

Figure 7 is a fragmentary transverse section taken on the line 77 of Figure 3.

Figure 8 is a detail transverse section taken on the l'ine'88 ofFigure 1.

' 'Figure 9 is a detail transverse section taken on the line 9-9 ofFigure 1.

Referring to' the drawings in'detail, wherein similar referencelcharacters designate corresponding parts (throughout the several views, the letter A indicatesflthe improved tool, which includes the'eleotricmotor 10 of the ordinary or any preferred type. The motor 10 has the armature shaft 11 thereof extended and rotatably mounted in a forwardly eXtending casi-ng' 12, the inner end of which is provided with a plur ality of outwardly extending fingers le-which are bolted or otherwise secured as "at 13 to the forward end of the casing 15 ofthe motor 10. The casing '12 may be provided with suitable roller bearings 16, so" as to reduce the friction between the shafts and the casing 12. larged to provide a housingl'? in which is positioned thebevelled gear 18'keyed to the forward end of the shaft 11'.

V The outer wall of the housing 17 carries the transversely eX- tending sleeve or bearing 19 in which is rotatably mounted the cross or driven shaft 20 on which the tools are adapted to be secured, In the drawing, a circular saw 21-is shown secured to the shaft 20, but it is to be understood that any suitable tool may be attached thereto, such as a rotary cutter,

The outer end of the casing 12 is enas to permit the free rotation thereof, and the inner end of the shaft has keyed or otherwise secured thereto a bevelled gear 23, which meshes with the bevelled gear 18 carried by the shaft 11. sleeve 19 is flared as at 24: for the receptlon of the bevelled gear, and a removable plate 25 is secured to the flared end so as to permit the'assembling of the device. The upper wall 26 of the housing 17 is removably associated with the housing and held in place by suitable screws or other fastening elements 27. The removable upper wall 26 permits the placing of the bevelled gear 18 in the housing. The opposite end of the bearing sleeve 19 from the flared portion 24 carries an outwardly extending reduced portion 28, against which bears the hub 29 of the circularsaw 21. The shaft 20, as stated is extended a suitable distance beyond the casing 19 and has its extended portion threaded as at 29, for the reception of various types of tools, and a retaining nut 30 is provided for holding the tools in position.

An arcuate saw guard 31 is provided for the saw-21 and this guard includes the outer curved wall 32 and the inner wall 33 which is provided with the downwardly and inwardly curved extension 3 1 which is bolted or otherwise secured to the casing 17 as at 35. The guard 31 is so shaped as to form a guard for various types of tools, and the outer portion of the same is left open so as to permit various widths of tools to be used in connection therewith.

The rear end of the motor housing 15 has secured thereto a handle 36, by means of which the operator may readily guide the ,tool when the same is in operation. The saw 21 or'other tool attached to the shaft 20 may be held in operative contact with the work by the'opera'tor placing his hand on the casing 12 andto effectively guard the operators hand from injury by the rotation of the tool, a hand guard 37 is provided. The hand guard 37 is substantially semi-cylindrical in configuration and is provided with the curved'end. walls 88, which carries the semicircular ribs 39, which are fitted in grooves 10 formed in the outer surface of the casing 12 The outer surface of the semi-cylindrical hand guard 37 is corrugated or provided with curved sections 41 which conform to the'configuration of the hand of the user.

The outer end of the the same includes a substantially rectangular flat plate 48, which is adapted to engage the work. .The lower surface of the plate 48 is provided with a plurality of longitudinally extending grooves 49 which lighten the weight of the plate and reduce the friction between the plate and the work, and thus permits the free sliding thereof over the surface of the work.

An upstanding rib 50 is arranged longitudinally of the plate as and is provideda'djacent one end with a pair of upstanding spaced ears 51, between which is adapted to be positioned the depending ear 52 carried y or formed integral with the motor casing 15. The space between the ears 51 is grooved or depressed as at 53 for the reception'of the ear 52 and these ears are provided with registeringopenings, which are adapted to receivethe pivot bolt .5 The motor casing 15 is also provided with depending spaced arms 55, which are arranged in spaced relation to the ear 52 and these arms are adapted to, engage the outer surface ofthe ears 51. The'arms 55 are provided with outwardly extending hubs 56, which are arranged in direct alignment with the openings formed in the ears 51 and 52, and these hubs are adapted to receive the pivot bolts 54, and one of the hubs 56 has its bore internally threaded for receiving the threaded terminal of the bolt 54. The opposite end of'the bolt is provided with a thumb piece 57 whereby the same may be readily adjusted. The bolt 5 1 can be readily removed so as to permit the base to be disconnected from the motor and its associate parts'and thereby allow the tool to be used without the base when necessary or desirable. The lower terminals of the arms 55 are extended below thelongitudinally extending rib 50, and are connected by a crosspiece 58 which carries the longitudinally disposed nut 59 which receives the adjusting screw 60. The rear end of the plate 9:8 carries an upstanding bracket 61, which has its upper terminal provided with a socket 62 for the reception of the ball 63, formed on the adjusting rod 60. The connection of the adjusting rod 60 with the bracket 61 permits the same .to swing in relation to the bracket so as to. adjust itself to the various positions of the motor 10. The outer end of the adjusting rod 60 carries a knurledhand wheel 64,

which permits of the ready turning of the rod. The cross piece 58 has one terminal thereof reduced as at 65 and rotatively mounted in one of the arms 55, while the opposite end of the cross piece carries a screw 66 which is rotatably mounted in the opposite arm 55. This connection permits the cross piece 58 to swing in relation to the motor casing so as to adjust itself to the various positions of themotor and its associate parts. By adjusting the rod 60, the saw 21 or other tool can be readily adjusted in relation to the work so that any desired depth of cut may be obtained, and to permit the operator to set the saw exactly at the desired point so as to obtain the correct cut, a dial or gage 68 is formed on the curved upper face 69 of an upstanding lug 7 0 formed on the upper surface of the plate 48 intermediate its ends. One of the arms 55 carries an indicator 71, which is adapted to cooperate with the gage or dial to give the correct reading of the set of the saw or other tool in relation to the work.

The improved tool A is conformed of relatively light material and wherever possible portions of the material are cut out so as to effectively reduce the weight of the tool.

In operation of the improved tool, the rod 60 is adjusted so as to permit the saw 21 or other tool to be adjusted in relation to the work, and the plate 48 is then placed on the upper surface of the work. The operator then grasps the handle 36 for guiding the tool over the work and the casing 12 for holding the saw or other tool in engagement with the work and then slides the tool over the upper surface of the work. This entirely eliminates the laborious work associated with wood sawing and the like and also efiectively cuts the time taken to do the said work to a minimum.

From the foregoing description it can be seen that an improved tool is provided, which is exceptionally simple and efiicient in use, and which can be used for a variety of purposes. 1

Changes in details may be made without departing from the spirit or scope of my invention; but,

I claim:

1. In a power operated hand tool, a substantially rectangular guide block having a longitudinally extending rib formed on its outer face, a motor including a casing arranged transversely of the rib, means hingedly connecting the motor casing with the rib, a tool carried by the motor casing and operated by said motor, means for ad justing the inclination of the motor and the tool in relation to the guide block, a depending arm carried by the motor casing and disposed adjacent to the pivot point thereof, an indicator carried by the arm, and a scale carried by the outer surface of the block and arranged at one side of the rib for cooperation with the indicator.

2. In a power operated tool, a guide block having a longitudinally extending rib formed thereon, upstanding ears formed on said rib, a motor, a depending ear formed on the motor, means hingedly connecting the ears together, depending arms formed on the motor and arranged on opposite sides of the cars, a nut carried by the arm, and an adjusting rod carried by the guide block and threaded in said nut.

3. In a power operated hand tool, a guide block having a longitudinally extending rib formed thereon, a motor, an ear formed on said motor, means hingedly connecting the ear with the rib, depending arms formed on the motor and arranged on opposite sides of the ears, a nut carried by the arms, an adjust ing rod carried by the block and threaded in said nut, an extension formed on said guide block having an arcuate upper face, a scale formed on said arcuate upper face, and an indicator carried by one of the depending arms and movable over said scale.

4. In a power operated tool, a motor having an extended armature shaft, a casing carried by the motor and arranged to receive the armature shaft, a bearing carried by the outer end of the casing, a counter shaft rotatably mounted in the bearing and operatively connected to the armature shaft, a tool secured to the counter shaft, a guide handle secured to the rear end of the motor, and a substantially semi-cylindrical hand guard secured to the casing and arranged at one side of the tool.

CHARLES SANDLIN.

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