US2011623A - Motor driven hack saw - Google Patents

Description

Aug. 20, 1935. J, P. FRENCH MOTOR DRIVEN HACK SAW Filed April 30, 1932 2 Sheets-Sheet 1 WY m .0 mm m NW mm m 5 M M w% w 6 m 2 Aug. 20, 1935. J. P. FRENCH MOTOR DRIVEN HACK SAW Filed April 30, 1932 2 Sheets-Sheet 2 INVENTOR. db/m gF/ww ATTORNEY.

Patented Aug. 20, 1935 MOTOR DRIVEN HACK SAW John il French, Alma, Mich., assignor of one-half to Frank E. French, Jr., Alma, Mich. Frank 0. Parker. administrator of saidJohn 1?. French,

' deceased Application April 30, 1932,8erial No. 608,388

6 Claims.

The object of the invention, generally stated, is to provide a hack saw construction having an improved holder which permits a slightyielding of the saw blade in a direction-opposite to the direction of feed inorder to cushionthe blade during the first part of the cutting stroke.

The above and-other objects will-appear as the specification progresses, reference being had to the accompanying drawings, in which I have shown the preferred embodiment of my invention,

and in which like referenoenumerals indicate like parts throughout the several views thereof. In the drawings Fig. 1 is a side view of my improved hack saw,

showing the saw blade holder and the pivotal connectionsfor the ends'ofthe saw blade.

Fig. 1 is a sectional view'taken substantially along line E I of Fig. 1 and is on a slightly larger'scale.

Fig. 2 is a part sectional top plan view taken on the-line 2-2 of Fig.1; i

Fig. 3 is an enlarged sectional end view taken on the line 3-3 ofFig. 1.I

Fig. 4' is a part sectional end View taken on the line i 3 of Fig. 1. Y

Fig. 5 is an enlarged'part sectional fragmentary front view, illustrating the saw frame raising means, the dotted lines-showing-it in raised position. r

Fig. 6 is a top plan viewthereof.

Fig. 7 is an enlarged detail of the chain link connection. 1

Fig. 8 is a front view of the chain yoke.

' Fig. 9 is an end view thereof. I

Fig. 10 is an enlarged sectional view of the feed screw pilot and bearing.

ings, the device comprises a base 5 having a socket 5 cast integral-therewith and in whicha standard I is inserted, said standard supporting the main frame and is rotatable to permit the work to be cut at an angle when necessary; a set screw 8 serves to hold the standard in setposition, and one side wall 9 of said socket is flat and forms the sta-' tionary jaw of the vise'inwhich the work Bjxis clamped. 7 Q

The base is preferably cast,ho1low as clearly shown in Figs. 1 and 4 of the vdrawingsaslot being formed in the face thereof, and a similar slot I i is provided in the lower wall, a boss I 2 being cast-integral with the one end, and isinternally bored and threaded to receive the threaded adjusting rod l3 which is'mounted therein, a handle i4 being-pivotally connected to the outer end of said rod to facilitate manipulation thereof.

A flat-faced jaw' i5 is ,pivotally secured to the opposite end of the rod 13, and is mounted to openings in said rib, ber in-position, bolts the slot H, and serve bench or other support.

A preferably tubular guide or track member. is is secured to the standard 1 by means of sup-' porting arms 23, said arms being rigidly secured to the standard and the like.

A sleeve member 22 is slidably mounted on the post'l, and a channel shaped laterally projecting frame section 23 is cast integral therewith, an olfset -leg 24 being cast integral with the sleeve, the outer end being'bored to accommodate the guide is, said leg beingsplit as shown at 25, and a bolt 26 serves to clamp the ends together permitting the leg to freely slide on the guide.-

A laterally projecting lug 21 is cast integral with the upper supporting arm 26, and an opening 28 is provided therein adapted to provide afriction bearing for the frusto conical projection of a pilot member 29. .The upper end of a feed screw 30 is fixedly securedin the lower part of the pilot member and a handle 3! is formed integral with the upper end of the pilot member to rotate the latter and the screw 30 when desired. An internally threaded bushing 32 ismounted in the frame as shown, and a ratchet wheel 34 is fixedly secured thereon. A pawl-lever 33 is rotatably mounted on the lower end of the bushing, and a pawl 35 is pivotally mountedon said lever in position to engage the ratchet wheel 35, a spring member 36 being anchored to said lever and to a suitable brace 3'i-providedon the sleeve 22, shown in Figs. 1, 2 and16 of the drawings, so that as the lever is actuated the pawl 35 in engagement with the ratchet wheel, will rotate the ratchet wheel and the bushing 32 to cause the same to ride downwardly on the screw 30. By. holding the ratchet wheel .34 stationary w 'le rotating the screw 38. clockwise by means of handle 3i, the ratchet. wheel and thebushing may be returned toward the upper part of the screw.

Spaced apart hubs 38am cast integral with the'frame and are bored to formbearings in which'the shaft 39 and 49 are journaled, the shaft 39 having a sprocket 4| mounted thereon, and a similar sprocket 42 is mounted on the shaft ill, a gear ZS 'being mounted on the opposite end of said shaft, meshing with and being driven by a gear 44, which is in turn mounted on the driving motor 45 in anyapproved manner, the gears 43 and Mbeinginclosed ina grease-tight gear box 46, so that the operation will be smooth and noiseless, and a back plate 37 is cast integral with the motor and forms aclosure for the back of said gear box.

Guides ifiaresecured to the upper andlower side walls, of the frame 23 by means of screws 49, and away is,provided in each guide and is guide by means of pins 2! or adapted to accommodate spaced. apart horizon- 3 a tr sh cu -v Rollers 5G and-'51 are interposed between the member'BQ, rocking iton the pin 6!, and as in-, dicated in dotted lines in.

.sawframe is raised to positionshown in dotted The frame is thenjreturned to the leftand remains in raised position,

1 ventional tension block 54 by'jthe friction bearing tally dispbsed bars 5 If, a which formthe 'upperfpart ofthe saw frame proper. The ends 'ofthje bars 5t are secured to end, members 52 and 53,13 spectively,

which areU-shaped in cross SGCtiOIflz.

sary friction to hold the member 59in raised position during 'thelreturn stroke; 4 M

sWhatI claim is: f

1. A saw-blade holder comprising, in combinat'on, a carrier frame, a saw-blade, means for se- A blade 54 is connected between the-lower endsof the saw frame and is held at its rear'en'dby-a conmounted in; a" suitably ap ertured portion at the lowerend ofthe-member I 52. The front end of the blade is pivotally'con- .nectedto a compensating link 55, which may be in the form of a suitably shapedblock mounted in the apertured lower end of the sawframe member 53and pivotally'connected thereto; When the saw is fed into thework, the link 55'pivots to p r t er rq t e of t e d t sp i upwardly, andrasthesawadvances on the cutting stroke, the link gradually drops back to its normal I, I position. This;springingaction of the blade produc'es' a 1 cushioning area which, preventsthe blade from twisting and chattering and insures bar members 5I,=the roller 56 being mountedon a suitablepin whichis in turn mounted in the.

hub 58' which forms a part of the main frame, the oppositerolleril being mounted on'an angularly disposedfmember 159, said member being p ivotally mounted on a rib 60, (which is cast integralwith th lframe) by means of the, pintl,

said rollersbeing so; disposed thatthe frame free lyrolls thereon;

A suitable sprocket chain connectsthe sprockets 4i and 42 and a driving pin 63 is'pro- ,videdintei rnediate the length of said chain, and engages a slotted opening 64 provided in the yoke 65, which' is in turn securely riveted to the bars 5!,- andit will be clearthat as the. chain travels the drivingfpin which :engages the yoke 65 will reciprocate the saw frame accordingly.

."Ihe lu shaped member 53- which forms the front end 'I'of the saw-frame projects above the bars'E l', andaslottedc ntact bar 661s adjustably mounted'thereon by mean's of screws 61, and as the'saw frame is reciprocated, the ,end of the bar 1 the sawffeed maybe regulated as desired; and the'spring member. fifi forces the lever 3 3 back to original position.

In, the operation stroke whichis toward the rightas seen in Fig. '1

anda pin 68 is, therefore, provided on theuppe'r 7 bar 5!, saidpin engaging the upperl'eg 69 of the igl 5, and so that the lines of thesame figure.

., until'it has r-eached the' extreme' end of the re:

turn stroke, when the pin 19", which is -mounted adjacent'the end of the bars 5I,"engage sthe cp s me s d o th l e fiaswingina h c I original' positiomand the sawthenfeedsinto' the a work on; the cuttingstroke; 12. v spring washer 1 l V is mounted on the pint] andp'rovides the'neces ofithe devises is e sential 60 that thesaw be, raisedron thelend. of the cutting,

cnring-theffront end of the blade to the frame permittingthe front end of the blade to spring slightly in theplane'of the blade during a cutting stroke, and means for securing the rear end of the'blade 'to'the; frame against movement relative thereto'otherithan pivotal movement and ifor adjusting th''tension of the blade.

12. A. saw blade holder comprising, in combination, a reciprocatory frame, a saw'blade, and a pair of blocks,- f or attaching the respective ends of the fbladetol the frame withethe cutting edge of the blade normally parallel to the direction of reciprocation .-and placing the blade under tension lengthwise; thereof, the block 'at the front end of theblade having agslight pivotal movement relat ve. to. the frame and tothe blade as anjin- ,ci dentjo'f:the pressure of the blade,. againsta piece of work to; decrease the-depthpfcutduring the first-part of thecutting stroke and to increase the t n o i evlb ad V A'saw-blade holdercomprising, in coinbinae tion, a U-shaped frame having apertures in the ends of the respectivelegs of the frame, a saw blade, a member secured to the rear end of said blade against; movement relative theretoother than pivotal movement and secured rigidly in the aperture-brone of the le iof the, frame for adjustment longitudinally of the blade totighten theblade, anda block pivotally-secured to the front end of the blade and pivotally secured in the aperture in theother leg, of the frame on an axis transverse to the bladeto permit the front end of the bladetospring. during a; cutting stroke in the direction opposite to thedirection of feed.

4. A saw-blade holderfor hack saw-machines comprising, in; combination, a, carrier, and means for mounting the ends of afl-blade in the carrier andoperable to place the blade under a normal predetermined tension lengthwise thereof, 7 said ineanshaving :a slight pivotal movement at the forward endof the blade in a direction to in crease thej -tension ofthe blade and caused as an incident of the pressure of the blade against a n w rk- V 1 r I 5.In"a device of the character described, including a' base, a'standard mounted thereon, a main framejslidably and adj ustably mounted on saidstandard, a saw frame reciprocably mounted on said ma nframeand including a pair of saw holding arms, a,;member rigidly held in one of said arms and" providing a fixed pivotal connec tion amneendor the saw, and a member piv;

otallyconnected to the other saw frame arm and pivotally connected to the end of the saw to per- -mit bne" end "of the saw blade to spring in the plane of the blade during the cutting stroke.

6. The combination with a power driven hack saw, ofQa supporting frame, a saw frame re-- ciprocably'carried by said'supportingframe, powerdriven means for reciprocating saidframe', a saw blade, means for securing the frontend of theblade'to the, saw frame permittingthe-front end" of the blade to spring slightlyin the planeof the, blade during abutting stroke,-. and means for se'culiingthe rea'r end. of 'theblade to the frame against movementjrelative thereto other than pivotal movement and for adjusting the tension o-ftheblade 1 f 1.103? was;

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