US682868A - Circular handsaw. - Google Patents

Description

No. 682,868. Patented Sept. I7, |90I.' D. A. DUGAN.

CIRCULAR HANDSAW.

(Application med Feb. e, 1901.)

(No Model.)

UNTTEDl STATES PATENT OFFICE.

DANIEL ANDREW DUGAN, OE BROOKLYN, 'NEW YORK.

CIRCULAR HAN DSAW.

SFEGIFICATION forming part of Letters Patent N 0. 682,868, dated September 17, 1901.

A Application filed February 8| 1901. Serial No. 46,575. (No model.)

To all whom t may concer-n.-

Be it known that I, DANIEL ANDREW DU- GAN, a citizen of the United States, and a resident of 330 Sixth avenue, Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Circular Handsaws, of which the following is aspecification.

The object of this invention is to provide a hand sawing-machine which will be especially adapted for cutting flooring, veneering, and like material.

It consists, essentially, of a base of suitable length and Width having on its upper side a longitudinal groove, within which is a bar the ends of which rest ou springs, and it is vertically adjustable. On the upper side of this verticallymovable bar is a dovetail or T groove running from end to end to receive the tongue of a base-piece which supports the saw and mechanism for operating the same. The base is adapted tomove along the slotted bar, carrying the circular saw therewith, thesaw being operated by a crank, on the shaft of which is a dilerential gearing, and the upright and base are further provided with a handle which maybe moved back and forth. The main base-plate is preferably cast and has at one end an adjustable chest-rest, so arranged that it may be inclined at any suitable angle and.- also adjusted as to height, all of which will now be set forth in detail.

In the drawings, Figure 1 is a side View of my improved hand sawing-machine. Fig. 2 is a top or plan View of the same. Fig. 3 is an end View with the base in cross-section along line 5 of Fig. 2, and Fig. 4 is an en' larged Vertical longitudinal section of the differential gearing and crank operating mechanism.

In constructing my invention I provide a main base 6, preferably of cast-iron, the lower side of which is centrally cut away, as at '7, so that the bearing or rest is at the ends of the base, thus providing clearance, so that the material to be cut can rest below the basepiece and still be within operative reach of the saw. At one end of the base is a tubular stem 8,hinged thereto'and adapted to be firmly held at any angle by a set-screw 9, which passes into the base from one side. Within this tubular stem is the shank 10 of a rest 11,

the shank being held in place by a clampingband l2 and screw 13 of the usual form of construction. The object of this is to provide a chest-rest for the user in operating the saw. On top of this main base is a bar 14, on the upper side of which is a T-groove 15, which extends from end to end. This bar rests in a groove or slotted opening 16 in the base 6 and at each end is a socket 17 on the under side to receive a coiled spring 18, and a series of holes 17 in the end of the bar 14 enables meto employ a pin 1S to hold the bar 14 when adjusted to any point.

The standard or upright 19 has a base 20, provided with a tongue T-shaped in crosssection and adapted to fit within the groove l5, so that the base 20 will slide freely therein. The upper end of the standard is bent forwardly into a step-like formation having a horizontally-projecting arm 22 to receive the crank-shaft 23. The step formation is composed ,of twobranches 24 of the upright,

.slightly separated from each other, so that when the pinion 25 is placed on the inner end of the shaft 23 it will rest between these two branches and operatively engage the large intervening pinion 26 below it, the latter being mounted on a pin 27, projecting from the front face of the standard. This latter pinion 26 engages with a smaller pinion 28, which is mounted on the horizontal shaft 29,that passes through the standard and carries on its rear end the circular saw 30.

The crank-shaft 23 has on its outer end a differential gearing composed of the bevelgear 31, which is rigidly secured tothe shaft, the bevel-toothed head 32, integral with the housing 22, and the interveningbevelgear 33. The crank-head 34 of the crank 35 is placed loosely on the shaft, and the bevel-gear 33 is loosely mounted on the stem 36, which projects out from the head 34. It is obvious, therefore, that the speed of the crank-shaft will be accelerated without using large gearwheels, although it is obvious that multiplying gear-wheels may be used, if desired.

A handle 37 is cast with the standard 19 and base 20 and so located that the operator can readily grasp it, and thus steady the mechanism, as well as move the standard back and forth as may be required during the sawing operationA IOO It is obvious that the apparatus in the form herein shown may be so placed in position that it will accurately out the material or adjusted to meet the requirements. It is easily operated and all the parts are accessible.

What I claim as new isl. A hand sawing-machine composed of a base having thereon a vertically-adjustable guide-plate provided with a groove therein, in combination with a standard, having a baseplate with a tongue fitting within the groove of the guide-plate, said standard having a handle for controlling same, a circular saw and crank for operating the same and intervening gearing between the crank and the saw shafts, substantially as set forth.

2. A hand sawing-machine composed of a base having a vertically-adjustable guide-` plate thereon, Aa standard adapted to move along on said guide plate, a circular saw mounted on a horizontal shaft in said standard, a crank-shaft having a differential gearing thereon, and intermediate gearing between the crank-shaft and saw-shaft, substantially as set forth.

3. A hand sawing-machine composed of a base in combination with a vertically-adj ustable guide-plate, a standard adapted to move on said guide-plate, said standard having at its upper end a forwardly-extending step-like projection composed of two sli ghtlyseparated branches, united to form a horizontally-projecting housing, a crank-shaft in said housing having at its rear end a pinion between the branches of the step-like projection and below said projection a pair of gears on the front side of the standard and a circular saw mounted on a shaft in the standard and operated by said gear-wheels, substantially as set forth.

4. A hand sawing-machine composed of a base, in combination with a grooved guideplate thereon and a standard adapted to move on said guide-plate, a circular saw mounted on a shaft in said standard, a crank-shaft and a train of gearing from said shaft to the sawshaft, and a differential gearing on the crankshaft, one member of said gearing being integral with the standard, substantially as herein set forth.

5. A hand sawing-machine having in combination a base provided at one end with an adjustable breast-rest, a vertically movable and adjustable grooved guide-plate on said base, a standard on said guideplate and movable thereon, a circular' saw mounted on a shaft in said standard, a crank-shaft having a differential gearing and intermediate gearing between the crank-shaft and saw-shaft and a handle on said standard for controlling the same, as set forth.

6. A hand sawingmachine having, in combination, a base provided at one end with an .adjustable breastplate-rest, a longitudinal groove or slotted opening in the base, a bar in said groove, a spring at each end within said groove to receive the ends of the bar, a series of holes at each end of the bar and pins to hold said bar, a `vertically-movable guideplate movable thereon and having a standard, a circula-1' saw mounted on a shaft in said standard, and a crank shaft and suitable gearing between said shaft and a saw-shaft, as set forth.

Signed at New York, in the county of New York and State of New York, this 18th day of September, A. D. 1900.

A. J. ZERBE, A. M. QUINN.

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