US1004651A - Power-hacksaw. - Google Patents

Description

E. s. BRADFORD, Jn. OM. OLSON. POWER HACKSAW. APFLIOATION FILED .JUNE 17I 1910 Patented Oct. 3, 19'11.

@EMM wp Massachusetts UNITED STATES 1;.'afnam".v OFFICE.

EDWARD s. BRADFORD, Ja., or unicorns, MASSACHUSETTS, AND' M'AUm'rz oLsoN, or BRIDGEPORT, coNnEc'rrcU'r; SAID oLsoN Assrenon 'ro SAID BRADFORD.

POWER-HACKSAW.

Specification of Letters Patent.

Patented Oct. 3, 1911.

voriginal application med september 24, 1909, seriai No. 519,371. Divided and uns application inea :rune 17,

1910. seria; No. 567,532.

To all whom it may co'ncem':

Beit known that we, (l) EDWARD S. BRAD- FORD, Jr., and (2) MAURrrz OLSON, citizens of the United States, residing at (1) Chicopee, county of Ham den, State of and (2) Bri geport, .county of Fairfield, State of Connecticut, have in vented an Improvement in' Power-Hacksavvs, of which the following is a specication.

This invention relates to certain new and useful improvements in power hack saws, being 'a division of our pending a plication for patent led Sept. 24, 1909, erial No. 4519,371. v

The invention has for its object the provision of improved means for lifting ,the saw during its return stroke in order to prevent dragging of the teeth upon the work.

A further Objectis to provide means for varying the distance to which the saw is raised during the return stroke.

The invention will be hereinafterfully set- A forth ,and particularly pointed out in ythe claims.

In the accompan ing drawings Figure 1 ,iSja plan view o a power hack saw emy bodying our, improvements. Fig. 2 is a side elevation thereof.` Fig. 3 is an end viefw lookingvfrom the right in Fig. 2. Fig. 4 is an enlarged view in side elevation, correspondingto Fig. 2, parts being broken away I and showlng a changed position of the blade lifting mechanism. Fig. 5 is a detail rear elevation corresponding with Fig 4. Fig. 6 iev-a section on the line 66 Fig. 5.

Referring to the drawings, 10 designates a frame provided with bearings 11 supporta shaft 12 on which is mounted adriving pu y. 13 Iwhich receives power from any suitable source.. Mounted to rotate on a shaft 14 isa sleeve 15 provided with a gear wheel 16 adaptedto mesh with a pinion 17 carried by the shaft 12. The sleeve 15 is also provided with a cam 18 which lies in the inner face of the gear wheel 16, and may be formed integral therewith if desired, (see Figs. 4 and 5).. U on the outer face of the gear wheel'l ,is a s 'de 19 adapted to reciprocate in ways 20, and provided with a pm 21. Said pin is -adapted to operatively engage an operating lever 22 pivotally sup ortedin the frame at 23 and having its ee-"end connected" with the saw frame 24 lby meansof a 25. The saw fra-me provided with the usual saw blade 27. Thev slide 19 may bereciprocated in any suitable manner and vthe pin 21 may be connected with the operating lever 22in any preferred way. The method illustrated in our nding application, above identified wil be found both convenient and eii'ective, and need not be further described here. Any suitable means for clamping the Work may be employed, the device illustrated comprising relatively adjustable jaws 28.

The bar 26 is rigidly secured at one end to a disk 30 which is in turn secured to a shaft 31 journaled, in suitable bearings 32 upon the frame work. The inner face of the disk 30 is provided with a recess 33 in which is located lan outwardly acting orexpanding clampin bear against the wa being provided to prevent displacement'of said ring. The ends of the clamping ring 34 overlap, the inner end being specifically 34, adapted' to ringl y l of t e recess, bolts 35 designated by 36 and the outer end by 36%v are so timed that `at the end of the forward stroke of the saw, the roller 39 will ride up.

on the high portion of cam 18, the efl'ectpf` which is to swing the arm 37. Owing to the distance between the pivotal points of said arm to the spring clamping rlng, said ring is ex anded or forced outward, and caused to grip the wall of the recess 33, locking the ring to the disk and oscillating the latter. The oscillation of the disk `30 swings the arm 26 which carries the saw upward, and retains it inthe raised position during the return stroke, at the, end of which the roller will ride down onto the low portion of the cam, releasing the grip of the spring clamping ring upon the diskf30, and permitting said disk, the bar 26, and the saw to drop to their normal positions an instant before the commencement of the next forward or operative stroke. The distance to which the saw is raised during the. return stroke is deter-` mined by adjustment ofthe tension of the l clamping ring 34. This adjustment is ef fecte'd by means of a l'screw l.tlgqlnounted in the frame work and bearing against the up- -p'e'i` endof the arm 37.` It will be obvious A .th .t by tighteningup said screw, the grip of tlre ring 34 upon the wall yof the retaining 4recess 33 will be reduced, and consequently `less oscillation .will be im arted lto the disk by the movement of arm 3 and'bar 26 upon which the saw frame reciprocates will not be swung as high. 'A slight loosening of the screw 41 will increase the grip of thel clamp ing ring 34; upon vthe Wall of the recess 33, thereby increasing the oscillation of the disk 30 and the lift ofthe saw carrying bar 26.

. gage the wall thereof, an operating arm for said clutch ring, `and means for periodically actuating said arm, whereby the disk is oscillated to raise the bar upon the return stroke of the' saw, and means for varyingthe period of engagement of said clutch ring and disk.-

2. An improvement in hack saws comprising a-supporting bar, a disk to whichone end of said bar is secured, said disk having a-recess, a saw mounted to reciprocate on said bar, a resilient clutch ring mounted in. said recess and adapted to engage lthe wall thereof, an arm to which each end of said clutch ring is secured, said arm being provided Witha beveled portion, means for pe- `incassi riodically operating said arm to 'operate the clutch, whereby the disk is oscillated to raise the bar upon the return stroke of the saw, and means engaging the beveled portion of said arm for varying the period of engagep ment of said clutch.

' 3. An improvement in hack saws'comprising a supportin bar, a disk to which one end of said bar lssecured, said disk having a recess, a saw mountedto reciprocate on said bar, a resilient 'clutch ring mounted in said recess and adapted t engage the'wall thereof, said ring being provided with overlapping ends turned in at an angle with relation to the body thereof, an operating arm havingl a beveled end and pivotally connectedwith both of said ends, a cam for ac-A tuating said arm, landan adjusting screw arranged to engage the beveled end of said arm. y v

4. An improvement in hack saws comprislng a supporting bar, a disk to which one end-of said bar 1s secured, said disk having a recess, a saw mounted to reciprocate o-n said bar, a resilient clutch ring mounted in said recessl and adapted to engage the wall thereof, an adjusting screw for varying the period rof engagement of said clutch ring with said disk, and means for periodically operating said clutch, whereby the disk is oscillated to raise the bar upon the. return stroke of the saw.

In testimony whereof we affix our signatures' in presence of the witnesses.

EDWARD s. BRADFORD, JR. MAURITZ OLSON. Vitnesses for Bradford: GRACE V. DONAHUE, E. F. COLBURN. l/Vitnesses for Olson:

A. M. WoosTER, S. `W. ATHERTON.

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