US935665A - Hacksaw-machine. - Google Patents

Description

E, D. LNFR.

HAGKSAW MACHHE. APPLIUATION FILED ocT. 2o, 190s.

Pamnted Gai. 5, 1969.

S SHEETS-SHEET 2.

H. D. LNFAR.

v HACKSAW MACHINE.

APPLIUATION FILED 001228, 190s.

Pammewt, 5, 3.909.

3 SHEETS-SHEET 3.

nutren rarnn'r onirica.

HEBEERT D. LANFAIR, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE HENRY G. THOMBSON 65 SON C0.. 0F NEU? HAVEN, CONNECTICUT, A CGBPORATION.

nacirsaw-niioninn Specification of Letters Yatent.

latented Het. 5, 1909.

Application filed October 2G, 1208. Serial No. 459,613.

To @ZZ whom it may concern:

-Be it known that l, HERBERT D. LANFAIR, a citizen of the United States, residing at New Haven, in the county of New Haven and State oi Connecticut, have invented a new and useful improvement in Hacksawn Machines; and l do hereby declare the o lowing, when taken in connection with the accompanying drawings and the numerals of reference marked thereon, to be a full, clear, and enact description of the saine, and which said drawings constitute part of this specitlcation, and represent, iii- Figurel l a side view ot' a hack saw machine constructed in accordance with my inv ention. Fig. 2 a top or plan view of the same. Fig. 3 an end view. Fig. l a plan View oit the cem, detached. Fig. 5 a perspective view of the lifting leverV with its clamping plate. '.Fig. 6l a perspective view of the cam lever detached. .i

rlhis invention relates to an improvement in hack saw machines, that is, a machine which will operate a hack saw particularly Jfor use in sawing heavybars or rods. ln the use of such machines it is desirable that the saw shall be lifted from thev workv on the return stroke of the saw, that is, the stroke following the cutting stroke. lt is also desirahle in such inaehines that the return stroke be made much more rapidly than .the cub ting stroke, and also .that wliileit is desirable that the machine shall be as light as possible and run smoothly, it is also essential that the saw frame be held comparatively rigid.

The object of this invention is to accomplish these results, and the invention consists in the construction hereinafter de- -scribed and particularly recited in the claims.

ln carril/ing out my invention l employ a bed or trame 2 supported by usual legs 3. Mounted at one end of the bed is a block 4 Yhaving twoupright wall-like bearings l5 and ing shalt 11 which is driven by the usual belt ypulley 12, a loose pulley l 13 being also mounted on the shaft 11. ln the tubular bearing T is a shaft 1st which is arranged ne parallel with but below the shaft "hatt carries a disk 15. Coupled l5 near the edge thereof is a pitlichv ispivotally connected to the sawjframe 17 which is oi3V usual construction and which carries the hack saw blade 1S.

At the top of the saw frame are two clip 'plates 19 and 2O which surround andl slide upon a guide bar 21, this guide bar 21fbeiiig formed as an extension of the arm 22 which is mounted on the shaft 6 between the. walls 5 and 6. The upper ends of the walls 5 and 6 are connected together by a bolt 23 so that they may be drawn together and against the arm 22 so as toprovidet'or the take-up of wear. The arm 22 is also provided 'with a lever rod 24 on which is a counter-balancing weight 25. A stud 26 by which the pitinan 16 is connectedto the disk 15 extends into a groove 27 formed on a cam 28 which is mounted on the shaft 8. lt will thus be seen that as the shafts 8 and 11i are arranged .in differentplanes, andas the stud 26 rides vin th groove 27, that when the cam is turned it will, during a part of the stroke, turn the disk 15 slowly, and this vtakes place as the stud 26 approaches the center of the cam; but as the cam 28 turns the stud 26 moves outward in the cam 27, and hence the diameter of the circle described by it increases, and hence the disk 15 is moved with greater rapidity and so that at one point in the revolution ot the cam the disk 15 is moved twice as tast at the other extreme movement.

-ln order to lift the saw from the work on the return stroke, I hinge a iod 29 `to the rear end of the guide bar 21, this rod passing down through the bed. Pivoted to the bed is a lever 30,. and securedto the lever is a clamping plate 31, the adjacent faces of the lever andA plate being notched to form a clearance for the rod 29 which passes between them. The outer ends of the lever and clamping plate are beveled .to enter a beveled notch formed in the end of a lever 34 which is pivoted to the bed and which extends into the path 'of the cani edge 35 of the cam' 2S, and sontliat as the cani is turned this lever will-be depressed, forcing its notched end 33 into contact with the ends of the lever 30 and plate 31 so as to clamp them together and onto the rod 29 and lii't the rod 29 so as to raise the saw trame. The outer end of this lever is held against the cani 29 by a spiral spring rEhe clamping of the lever and plate on the rod 29 takes place during the return stroke,`tlie cam being so timedto (lepress the lever 34- when the cutting stroke is completed. lWhen the cutting is completedplate 31 out of the notch 33 in the lever 34.

so as to release the lever and platefrom the rod 29 to allowthe saw frame to be lifted by the handle 40.

To adjust the extent of lifting movement of the saw after each cutting stroke, an adjusting' screw 41 is mounted in the lever 30 'so as to rest upon the transversely arranged arm 38 against which it is pressed by a spiral spring 56.. The transversely arranged arm 38 is pivoted to a vertically arranged shaft 42 whlch is adapted to be turned by a handle lever 43. Connected with the vertical shaft 42 and operated thereby is a belt shifter 44 which isladapted to be moved to shift the belt from the pulley 12 to the pulley 13, or

vice versa; and this shifting takes place am.

tomatcally by the turning of the transversely arranged lever 38 by the saw frame l17 as before described, at the same time the lever'is lifted to be disengaged from the .rod 29. f

To'limit the downward movement of the saw frame Ivpivot arod 45 to the bed and provide it with a lug 46 in which is mounted an adjusting screw 47 in the path of a shoulder 48 on .the arm 22 through which the rod 45 passes. Near the upper end of the rod 45 is a notch 49 which engages with the edge of the opening inthe arm 22 through which the rod passes and so that when the guide bar 2 1 is raised for the insertion 'of new work, the arm will engage with the notch 49 and hold the saw frame in its raised position. In order toe-release the arm 22 from the notch 49 I mount a latch 50 on the top of the arm 22 and connect the latch by a rod 51 with'a button 52vadjacent to the handle 40, and so that by `pushing on the rod 51 the latch 50 will r'push the rod 45 out of engagement with the arm 22 so as to allow the guide bar and saw frame to drop. Mounted onf the bed is the usual fixed jaw 53 and movable jaw 54 operated through 'a lscrew 55 and between which jaws the work to be cut is clamped.

I claim 1. In a hack sawI machine, the combination with a frame, bearings at one end thereof, a shaft mounted in said bearings, a cam on said shaft, an arm mounted on the cam shaft and supporting a guide bar, a saw frame, means for movingsaid saw frame, a vertically Aarranged bar pivoted to said arm, a lever mounted on said bed, a clamping plate connected with said lever, and .means operated by said cam' for clamping said plate and lever to the' said rod.

2. In a hack saw machine, the combination with a frame, bearings'at one end thereof, a shaft mounted in vsaid bearings, a cam shaft and supporting a guide bar, a' saw frame, means for moving the framelwith relation to said guide bar, a vertically arranged bar pivoted to said arm, a lever on said shaft, an arm mounted on the Said i Inounted on said bed, a clamping plate connected with said lever, a cam lever moved by said cam and adapted to clamp. the plate and lever to the said rod.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

` HERBERT D. LANFMR.

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