US1470897A - Hack saw - Google Patents

Description

Oct. 16 1923.,

A. G. voLTz HACK SAW Filed March 2O 1922 5 Sheets-Sheff(I 1 Oct. 16, 1923.

A. G. voLTz HACK SAW Filed March 2o, 1922 3 Sheets-Sheet 2 YOct. 16 1923.

A. G. voLTz HACK SAW Filed March 2O R922 5 Sheets-Sheet 3 Panarea @ce M1923,

NHT P swat aimais? carica,

ALBERT G. OLTZ, 0F TULSA, OKLAHOMA.

HACK SAW.

nppueaion sied march 2o, 1922. serial 1ro. 545,153'. f

homa, have invented a' certain new and useful improvement in Hack Saws, of which the following is a complete specification.

This invention relates to hack saws, and more especially to hack saw frames, and my ob-jectl is to produce a construction which Will/accommodate hacksaw blades of di'erent'lengths; in which the blade can be set to cut a pro]ection in substantially the plane of the surface from which the projection extends; or to cut obliquely with respect to the plane of the frame; and by which the blade canbe dis sed at varying distances from the back ogthe frame and eitherparallel therewith or in converging relation thereto, the last-named adjustment being l,desirable as it permits of'a cut being made from the vinside of a tube' or hole.

With these general objects fin view and that it ma be fully understood, reference .is to be had7 to the accompanying drawings,

`in which Figure 1 is aside elevation of a' hack saw embodying the invention;

- Figure 2 is a top-.view-.of the same;

Figure 3 is a section on the line III-IH of Figure 1; l

Figure 4 is a section on the line IV-IV of Figure 1;

Figure 5 is an enlarged section on the line V-`V of Figure l; t

Figure 6 is an enlarged section on the line VI-VI of Figure 1;

Figure 7 is a detail section taken through the saw blade when arranged to cut parallel with but offset with respect to the back Voi=` the frame; 4 l.

Figure 8 is a similar detail with the blade set to cut at an angle with respect to the side-of the frame; e

Figure 9 is a section taken on the line l'X-IX of Figure 2; v

Figure 10 is a detail rspective view showing a part of one of th angle arms of the device;

Iwidth as at a, (Figures 1 to 18).

Figure 11 is a detail showing the connection between-one end of the saw blade and one angle arm of the frame;

' Figure 12 is 'a section on the line XII-XII of Figure 11;

Figurel 13 is a section XIII- XIII of Figure 11;

AFigure 14 is a detail perspective view of on the i line one of the brackets which support the ad justable saw`carrying holders:

Figure 15 is a perspective view of an octagonal cap for locking one of the holdersv at di'erent points of its rotary adjustment;

Figure 16 is a view corresponding lto Figure 14, but of the other bracket;

Figure 17 i is a fragmenta View of the saw-carrying holder for use with the bracket of Figure 16;

Figure 18 is a side elevation partly broken away, showing the construction and arrangement of parts whereby a saw blade can be arranged i'n close proximity with and parallel to the back of the frame or set at a forwardly converging angle with respect to the back of the frame;

Fi ure 19 is a section on the line XI -XIX of Figure 18; and

Figure 20 is a modified construction disclosed partly in side elevation and partly in section and illustrative particularly of a cheaper construction and how certain adjustments are made to accommodate blades v of different length.

cates the handle of a frame ofa hack saw,

and secured as at 2 to said handle is the back 3 of narrow chaneled construction for the greater portion of its length, said channeled back-being increased in de th and t is provided in the lower edges of the side walls with equi-spaced notches 5, and at the extreme end of portion 4 with lugs 6 connected by a cross-pin 7. A relatively short channel member 8, corresponding substantially in cross 1sectional form to the back, fits l snugly within the enlarged ,portionY 4 and is provided with a-plurality of notches 9 in its lower edge, any one of which is adapted fo be engaged by the cross-pin 7 mentioned, for the purpose of holding theJ member 8 at the desired adjustment. .The channel member 8 projects beyond the front end of the back, and its walls are extended downward below the walls of the back and one of the extensions of said walls is equipped with a headed lug 11 and forward thereof the eX- tensions are more 4widely spaced, (see Figures 2 and 3) to produce a pair of lugs 12 equipped with a cross-pin 13.

A pair of angle arms 14 constituting parts of the frame, are adapted to be itted with their long ends (Figures 1 and 18), or their short ends (Figure 20), in the channel of the back and in the channel member 8 respectively, and at the inner side of the angle formed by said arms are provided laterallyprojecting lugs 15 having notches 16, and the ends of said arms are formed in their opposite sides with cavities 17 spaced at equal distances apart. To secure said angle.

arms to the back, the cross-pin 13 engages one of the recesses 16, and a similar crosspin 18 engages the corresponding recess ci the other arm, the cross-pin 18 connecting the ends of an inverted U-sha-ped clip 19 itted slidably on the back 3. The laterally projecting lu 15 by bearing against the inner sides ot lugs 12 and of the cli v 19, tend to prevent lateral :movement oi) the angle arms and to provide wider bearings on the pins 13 and 18. rlhe ends of the angle arm near the handle end of the back, are provided with opposite pins 16, the set of such pins of the end engaging .the channeled back, engaging opposite notches' of the back to prevent longitudinal slippage of the angle arms.

A. right-angle shaped bracket 20 is formed with a keeper 21 fitting slidingly on the end of the adjacent angle arm 14, and a set screw 422 carried by said keeper is adapted for en.-

gagement with one of the cavities 17 to secure the bracket against accidental movement. A similar bracket 23 is provided with a keeper 24 to it on the adjacent end of the other angle arm, and a set screw 25 is carried by said keeper for -engagement with one of the cavities 17 of said angle arm.

At the opposite end of the angle bracket 20, a tubular bearing 26 is secured as at 27,-

the said bearing at its ends being of Octagonal form as at 28. A similar bearing 29 is secured as at 30 to the vangle bracket 23, and at one end is formed with an octagonal socket 31. A rotatable saw holder 32 fits in the bearing 29, and a rotatable holder fits in the bearing 26, each of said holders having ori-@set angle arms 34 having laterally projecting headed lugs 35 and corresponding Adepending lugs 36 projecting at right angles to lugs 35. The blade 37 is provided with the customary openings forwengaging the lugs 35 or 36 according to the adjustment of the holders. To provide for securing the holder 32 at diii'erent poinl's of rotatable adjustment, the latter is provided with an octagonal head 38 for engagement in the invase? oetagonal socket 31. lFor the same purpose the holder 33 is threaded as at 39 and provided with a longitudinal groove 40, and

fitting on said stem is an octagonal cap 41 engaging the adjacent octagonal head of bearing 26, the cap having a tongue 42 engaging the groove a0 to prevent rotatable movement of the holder, and to secure the cap in operative position, a wing-nut 43 engages the said holder and clamps said cap upon the correspondingly.contoured end of the bearing 26, as shown clearl by Figure 11. By the construction described, it will be apparent by reference to Figures 5 to 8 inclusive, that the saw blade 37 can be secured to cut in the plane of the center of the back as shown in the iirst two igures mentioned, or can be arranged to cut in planes at opposite sides of and parallel with the center of the back as indicated by full and dotted lines in Figure 7. lf desired, the blade can also be arranged to cut at angles of forty-live degrees to the plane of the frame, as shown by Figure 8. To produce cuts in the plane of the center of the back, the blade is secured on the lugs 35 at the side of the oset portion of the holder. When the blades are arranged to cut at opposite sides of such plane or obliquely with respect thereto, they are engaged with the lugs 36 as indicated clearly b Figures 7 and 8. lt is also obvious that i it is desired to make 'a horizontal cut while retaining the frame in a vertical position, the blade can be set on lugs 36, as shown by dotted lines, Figure 6, or the same result can be obtained when the holder is posi-tioned as shown in Figure 7, by setting the bladel horizontal on lugs 35, as indicated by dotted lines in said figure. ln both cases lateral pressure must of course be applied on the handle. The 'use of the saw in the positions last mentioned will be required but seldom, but occasions will present themselves when a cut with the saw can be made in no other way, and the same statement applies as to the use of the saw as shown by Figure 8, it. being understood, of course, that the octagonal settings ot' the holders permit of the use of the saw with the blade reversed to present its teeth' toward the back of the frame. The cutting edge of the saw can be presented in eight different directions by proper rotatable adjustment ot' the holders. In Figure 7, lthe dotted lines L indicate a right-angle frame and dotted lines 1, a rod. VBy setting the blade o'set with respect to the saw frame as shown by dotted lines, the rod 1 can be cut substantially Hush with the inner vertical face of frame L, without conict between the latter and the back of the saw frame. ln fact, by putting a light lateral strain on the blade it can be caused to cut Hush with the inner face of frame L, a result practically impossible with an ordinary hack aereas? l saw, as the back thereof by ntact with the frame L, would hold the blade a substantial distance from the vertical face of the frame.

lt Will be apparent that by adjustment of the clips 21-24, toward and from the back of the trame, the blades can be dis.- posed dierent distances from the back, this arrangement permitting objects of different thicmless or depth to be cut, it being also noted that if the angle arms la are reversed from the positions shown, that is, it the short ends are secured to the back and the long ends extend at right angles to the back, provision is made for a much wider range of adjustment as to dist-ance between the back and the blade. It is apparent, of

course, that the blade is held in place under a pulling strain applied at its rear end, and thatl this pulling strain holds the headed end of holder stem 32 in the octagonal socket'31, and that under the pulling strain exerted the tendency of the exposed ends of the angle armsl is to move toward eachother and fulcrum upon thepins 13 and 18, the opposite portions of saidangle arms therefore bearing against Athe closed end of the channeled back and channel members 3,and 8. lt has been stated that thekeepers are adapted to beadjusted upon the angle arms to- Ward -and. from the back for the, purpose of disposing the blade different ,dis-

' tances from the back, and it will likewise be understood that said angle arms can be adjusted longitudinally of the back for the .purpose of disposing their projecting ends aty different distances apart to accommodate blades'of diierent lengths, ltwillfalso be apparent that blades of did'erent lengths can be accommodated by reversing the position of the bracket 20 with respect to its carrying angle arm, that is to say said bracket can be disposed as shown in dotted lines in Figure 20, this adjustment providing for the use of a hack saw'of maximum length. If

desired, the'said bracket can be adjusted to said dotted position, and then the holder 33 can be removed from the bracket and mounted therein in'reverse position. That is to sayyby reversing the position of the bracket 20, the otr'set end 34 of the bracket is disposed adjacent the handle of the frame, but by also reversing said holder 33, so that the offset end shall underlie or stand in ad- Vance of the bearing 26, a saW blade of intermediate length may be used, it being under-l stood that when this is done the cap 41- fits over the octagonal head 28 shown as inoperative in Figure 1.

' To dispose vthe blade in close proximity to the back, the brackets 20 and 23 can be inverted as shown by dotted lines in Figure 1, but if the saw is to be used in a' place where it would be impracticable to use the front angle arm 14, thek latter and its bracket 23 and holder 32 will be discarded, and the the length of the blade. IWith the arrange- I ment last described, it is possible to sever an internal projection of a tube or opening provided the same is large enough to receive the back and blade. lt is also possible to set the blade at different degrees of convergence with respect to the back, one of such positions being indicated by Figure 18. lt is likewise obvious that with this arrangement of parts, blades of different lengths ma be used. n Figure 20, a modication appears in Which one detachable part (8) is dispensed with and the enlarging of the back 3, at 4:, is not necessary. The front end of the back, however, is formed to correspond with such end of the member 8, and is identified by similar reference characters as performing the same function. In this case the longitudinal adjustment to accommodate blades of different length must occur at the rear end only of the blade, as the front angle-arm 14 must bear a fixed--relation to the pin 13 as regards movement longitudi` nally of the back of the frame, it being of courseunderstood that it is practical to reverse the position of the bracket 23 onvthe front angle arm 14 to accommodate saws of different length. From the above description it will be apparent that I have produced a device embodying the featuresrof advantage enumerated as desirable-in the statement of the objects-of the invention, and -while I have illustrated and described the preferred form ting' the latter to be inverted for positioning the blade-attachingl rends of said holders either toward or away from said back and thereby varying the distance between said blade and back.

2. A hack saw comprising a back, a saw blade, a pair of arms independently adjustable longitudinally along the back, a pair of angle arms independently invertible and reversible respectively on the first-named arms for projecting their free ends toward or from the back and in the same longitudinal direction or toward each other, and angle holders rotatably adjustable onsaid angle `arms and detachably connected to said saw alined, anglel shaped holders rotatably mounted on the. alined ends of the anglearms and relatively adjustable longitudinally, and a sawblade detachably connecting the said angle holders.

4, A hack saw comp-rising a back, a saw blade and spaced mea-ns on the back and adjustable longitudinally alon an angle bracket carried by sai arm, means supporting the'blade in fixed relation to the back'; the me'ans nearest the rear end of the back having a longitudinally-adjustable element applying a pulling tension on the blade and, reversible to accommodate blades of different lengths.

'5. A hack saw comprising a back, a saw blade, means carried by said back and 'supporting the front end'of saidblade, an arm said back,

connecting`said arm to said bracket and permit-ting the latter to' be 4inverted for positiouing kits blade-carrying end either toward or away from the back and also allowing said bracket. to be projected either forwardly orlrearwardly from said arm for laccommodating blades of different length, and an adjustable blade-attac-himcg; element carried lby said bracket and lsecured to the rear end of said blade.

6. A hack saw comprising a back, a saw blade, means carried bythe back and supporting the front end of the blade, an ang e arm adjustable on thev back, a bracket sccured on saidang'le arm, and 'a longitudinally-adjustable holder carried by. .the bracket andfattached to the rear end of the blade and reversibleJ to accommodate blades of different length.

v7. A hacksawv comprising aback, a saw blade, means carriedvby the back and sup porting the front end of the blade, an arm on the rback, a bracket adjustable on the an'- gle arm toward and from .the back, and a longitudinally-adjustable holder vcarried by the bracket and. attached to the rear end of f the blade, said holder being of angular'form porting .and also angularlyadjustable about the axis offene of its end portions for variously' po sitioning the blade with respect to said back.

8. A hack'saw comprising a back, a saw blade, means carried by the back and supthe frontend of the blade, an anglo arm adjustable on the back, a bracket on the angle arm and reversible to project forwardly or rearwardly7 therefrom, and a longitudinally-'adjustable holder carried by the bracket and'fattached to the rear end of the blade.

9. A hack saw comprising a back, a pair of brackets carried by said back, an angle blade-holding bracket carried by each of said first 'brackets,and a saw blade having its opposite ends connected to said angle brackets, said angle brackets being mounted for adjustment toward and away fiom'each,

blade, means secured t0 the ront end of the' blade and to the back, and means secured to the rear end of the blade and to the projecting endlof said angle arm, the pull of the blade causing the anglearm to' fulcrum on the cross-pin to hold the pin of the arm in the said notch of the back.

11. In a hack saw, a channeled back, having a cross-pin, a channeled extension fitting and slidable longitudinally in the back and provided with notches in its lower edge for selective engagement with the cross pin, and also provided at its front end with a crosspin, an angle arm with one end fitted in said extension member. and its other end projecting downwardly and having a notch at. the inner corner enga 'ng the cross-pin of the extension, a pair o alined holders fixed with relation tothe back and relatively adjustable toward and from each other, one otthem supported from the projecting end of the anglearm, and a saw blade connected at `its ends to said holders.

12. A hack saw comprising a back having a handle, a pair of arms depending from the back, angle. arms slidably fitted at one end on said depending varms respectively, and

having their opposite ends longitudinally alined, angle'. shaped holders rotatably mounted in. the alined ends of the angle arms, and relatively ad'ustable longitudinally, and a saw blade etachably'connecting the other ends of said angle holders and capable through adjustment of the latteraround a common axis, of facing in various directions with respect to such axis.

13. In a hack saw, a pair of arms having llongitudinal tubular portions, a blade, an-

gle holders attached to opposite ends 'of the blade and extending rotatably through the tubular portions of said arms respectively;

one of the tubular portions at its end remote from the blade, being of angular form'externally, a cap fitting non-rotatably on the angular end Iofsaid tubular 'portion and slidably but non-rotatablyon .the respective holder, and means for securing the said holder and cap in fixed relation to each other and the angular end of the said arm.

14:. In a hack saw, a pair of arms having longitudinal tubular portions, a blade, an-

' gle holders attached to opposite ends of the blade and extending rotatably thrugh the tubular portions of said arms respectively; one of the angle holders having a threaded longitudinally-grooved A stem extending through the tubular portion of a holder, and the latter at its end remote from the blade, being of angular form externally, an angular cap :fitting non-rotatably on the angular end of the tubular portion and slidably on the respective holder stem and provided with a tongue engaging the groove of said stem, and a nut engaging the stem and clampin the cap securely on the angular end of t e tubular portion of said arm.'-

15. In a hack saw, a back, a pair of arms having longitudinal tubular portions, a blade, angle holders attached to opposite ends of said blade and having stem portions extending through the said tubular portions of the arms; one of the angle holders having an enlargement or angular head at its front end and the tubular portion of the corresponding arm an angular socket of larger diameter than the bore of said tubular portion, and receiving said angular head and preventing turning thereof, means for preventing turning movement of the other holder, and means for adjusting it longitudinally to tighten the saw and hold the angular head of the other holder clamped against the respective arm and Within the angular socket thereof.

16. A hack saw, comprising a back, an arm projecting fromand at an angle to the back, an angle bracket supported in fixed relation to. the back and an angle bracket supported4 directly on the said arm or the back, angle holders rotatably carried by said angle brackets, and a saw blade connected at its'opposite ends to said holders.

17. A hack saw, comprising a back, an arm projectin from and at an angle to the back, an ange bracket supported in fixed relation to the back and an angle bracket reversibly mounted on said projecting arm,

angle holders rotatably and longitudinally adJustable on said an le brackets, and a saw connected at its en s to said holders respectively. l

18. A hack saw, comprising a back, an arm projecting from and at an. angle to the back, an angle bracket supported in fixed but reversible relation with respect to the back, an angle bracket reversibly mounted on said projecting arm, vangle holders rotatably carried by and adjustable longitudinally on said holders, and a saw blade connected at its ends to said holders.

In Witness whereof I hereunto affix signature.

ALBERT G. VLTZ.

my c5

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