US2767751A - Hacksaw with magazine handle for continuous blade - Google Patents

Description

' Oct. 23, 1956 l ,1. E.' sJBLoM vHAcKsAw WITH MAGAZINE HANDLE: FOR CONTINUOUS BLADE Filed Aug. 2, 1955 ze "gg L Unite States Patent HACKSAW WITH MAGAZINE HANDLE FOR CONTINUOUS BLADE John Emanuel Sjblom, Ornskoldsvik, Sweden, assignor go Gunnar Johan Emanuel Ekberg, Ornskoldsvik,

weden Application August 2, 1955, Serial No. 525,947

8 Claims. (Cl. 145-33) This invention generally relates to hacksaws and, more particularly, to certain new and useful improvements in hacksaws of the type comprising ya substantially invertedly U-shaped frame member between the legs of which an elongated llexible cutting member in the form of a hacksaw blade -is stretchable.

One specifi-c object of the present invention is to provide a novel hacksaw having means enabling at least one continuous cutting member or hacksaw blade of a length corresponding to the total length of a comparatively large number of conventional hacksaw blades to be housed in storage means provided therefor in association with the frame and handle assembly.

Another object of the invention is to provide a novel hacksaw of the general type specified in the preceding paragraph and having novel gripping and stretching facilities for the continuous cutting mem-ber or sawblade enabling quick Vand easy handling of the latter.

Another object of the invention is to provide a novel hacksaw having means which ensure, if the cutting member or sawblade bursts at or near the end thereof remote from the storage means therefor, that a complete cutting length will not be wasted, but only a minor portion thereof.

A further object of the invention is to provide a hacksaw as specified accordingto the preceding objects and having a continuous hacksaw blade which may be considerably narrower than a conventional hacksaw blade so as to .afford improved cutting characteristics .as compared to the conventional hacksaw blade.

`For the objects stated, according to the present invention, the novel hacksaw comprises in combination: an invertedly U-shaped frame member, tool-gripping means provided on the extremities of the legs of said frame member, an elongated flexible cutting mem-ber stretchable with an operative portion thereof between said gripping means, storage means associated with said frame member at one end thereof for housing a continuous length of said elongated cutting member corresponding to several lengths of said operative portion, tensioning means for said cutting member associated with said gripping means of the frame-leg remote from said storage means, and means associated with said storage means for enabling manual withdrawal of successive portions of said cutting member to be engaged by said gripping rneans and to be tensioned between said framedlegs by said tensioning means.

Further objects and advantages of the invention will be set forth or become apparent from the following description of a preferred embodiment thereof, to which the invention -is by no means restricted, reference being hadV to theaccompanying drawing in which:

Fig. l is a side-elevational view of a hacksaw incorporating the -improvements of the present invention.

Fig. 2, on an enlarged scale relative to that of Fig. 1, is a side-elevational View, partly in section, of one end portion ofthe hacksaw. v

Fig. 3 illustrates a plan view corresponding to Fig. 2.

Fig. 4, on an enlarged `scale relative to those of Figs. l and 2, is a cross-section taken along the line 4-4 in Fig. 2.

Fig. 5, on a further enlarged sca'l-e, is a lateral elevational view of a component device of the hacksaw, and

Fig. 6 is an end elevation of this component device.

Referring to the drawing, the hacksaw illustrated therein comprises a substantially U-shaped frame including a pair of legs 2, '3 and an intervening portion 1. Associated with this frame at one end thereof is a storage magazine to be described further below and serving for housing a coiled :continuous flexible sawblade 4 adapted to be withdrawn successively, as required, through a feed opening 5 provided in the wall of t-he magazinecase.

The sawblade magazine according to the invention is in the form of an annular case 6 provided with a correspondingly shaped cover 7. The case 6 and cover 7 are each detachably connected, as by screws, to an individual bracket plate, 8 and 9, respectively, these plates being in turn detachably connected, as by bolts and nuts, to either sides of one leg 3 of the hacksaw frame. Thus the case and cover are maintained in their relatively Iclosed Iposition in part by said bracket plates f8 and 9. In addition, the case and cover are kept together by two corresponding handle-forming members or lbraces 10, 1-1 secured together by screws or the like, one, 10, of these members lengaging the case 6 and the other member, 11, engaging the cover 7, the members 10, 11 forming together the operating handle for the hacksaw.

Received within the magazine `6, 7 is an annular disc or trough 12 which is rotatably mounted in the ymagazine and engages the toothing of the continuous strip-like sawblade 4 coiled within the magazine so as to be rotated by the'action' of the coiled-in portion of said sawblade 4 as this portion is rotated upon insertion or withdrawal of the sawblade.

.The feed opening 5 of the magazine A6, 7 is formed by -complementary cutouts made in the ,arcuate peripheral outer walls of the case 6 and the cover 7, this opening being so disposed as to be in alignment, or substantially so, with the sawblade gripping and tensioning means designated by reference numerals 13 to 22, inclusive, as will be described more in detail further lbelow.

The sawblade gripping and tensioning means, as will be understood, may 'be devised in any one of several possible ways. In the embodiment illustrated in the drawing this means comprise two gripping devices, denominated 13, 115, 17, 18, 19 and 1L4, .16, 17, 18, l19, respectively, which are presently to be described, land which are associated with individual ones of lthe two yframe- legs 2 and 3. One of these gripping devices, 13, 15, 17, 18, 19, is mounted on a tension screw 22 rotatably mounted in lix'ed relation to the frame-leg 2 which is remote from the magaz-ine 6, 7. This tensioning device is adapted to enable the gripping device associated therewith to be actuated in the longitudinal direction of the frame 1, 2, 3. The other gripping device 14, 1'6, 17, 18, '19 is rigidly connected to the extreme end `of the other frame-leg 3.

Each gripping device comprises an annular sleeve 13 or 14, respectively, in which is received a cylindrical body 15 or 16, respectively, which is rotatable within the sleeve. Each body 15 or 16, respectively, has cut in it a bottomed slot 17 extending substantially in an axial plane therethrough, these `slots 17 serving for the reception of a portion of the Continous sawblade which has been withdrawn from the magazine 6, 7. Each sleeve 13 or 14, respecadapted, when completely screwed into said body, to project into the slot 17 therein and, when tightened against the slot-engaging sawblade-portion, to clamp the latter in the slot 17 and simultaneously therewith to expand the body '1orl 16, respectively, into'firm engagement with the inner surface of the sleeve` 13 or 14, respectively, so as to prevent rotation of the body relative thereto. Since, in addition, the set screw 19of each gripping device projects into the body 15 or 16, respectively, through a peripheral slot 18 in the sleeve 13 or 14, respectively, the bodies 1S,- 16, also by means of their respective set screws 19, may be clamped in their respective sleeves in various langular positions, as desired.

Thetension screw 22 for actuatingone of the gripping devices is journalled in the legs 2G, 21 of a U-shaped bracket secured to the extreme end of the frame-leg 2 and-extending in the longitudinal direction of the frame 1, 2, 3; The` screw 22, in addition, is screw-threadedly engaged in a nut formed by an extension 23 of the sleeve 13 forming part of this gripping device, said extension projecting into the gap between the bracket legs 2G, 21, whereby said gripping device is movable in a direction to cause tensioning of the operative sawblade portion stretched between the two gripping devices of the hacksaw frame.

When a continuous hacksaw blade 4, coiled within the magazine 6, 7, is to be connected to the gripping and tensioning devices 13 to 22, this is preferably performed in the following manner: The sawblade 4 is Withdrawn in part from the magazine 6, 7. The blade-portion withdrawn, concurrently therewith, is introduced into the slot 17of the body 16 situated next to the magazine and is then-extended to the gripping device situated remotely from the magazine. Then the blade-portion engaging the said slot 17 is clamped in said body 16 by tightening the corresponding set screw 19 therein. The extended end of the blade-portion is then engaged into the slot 17 of the. body 15 remote from the magazine 6, 7 and is clamped therein by tightening the set screw 19 in this body; After this being done, the blade-portion thus stretched has to be set at the desired angle of inclination relative to the frame-legs, and this operation is accomplished by first slightly loosening the set screw 19 of, for

instance, the gripping device situated next to the magazine, so as to enable the body 16 of the sleeve 14 thereof to. be rotated into the desired angular position, after which the said screw 19 is retightened. Then, in the corresponding manner, the body 15 of the other sleeve 13 is rotated into the last-mentioned angular position andis reelamped to this sleeve by retightening the set screw 19 associated therewith. Then the tension screw 22 serving for actuating one of the gripping devices is rotated inA a sense to cause the last-mentioned gripping device to move away from the other gripping device whereby the operativeblade-portion is tensioned.

In. order to facilitate the handling of the hacksaw durinA the operation of mounting and tensioning the sawblade in the frame 1, 2, 3, the heads of the screws 19 and 22 are formed with hexagonal recesses adapted to receive a rod-like hexagon Spanner 24. It will then be possible, by the aid of such spanner 24, simultaneously to rotate the screw 19 projecting into the sleeve 13 or 14, respectively, and move the body 15 or 16, respectively, received in such sleeve into the desired angular position. Incidentally, the hacksaw frame assembly may have any suitable provision for housing the Spanner 24 when not in use, such housing means being suitably provided in association with the bracket plates 8, 9 and the frame-leg 3 mounting these plates, as illustrated in Figs. l through 3 of the drawing.

It will be seen that the objects of the invention as stated in the preamble of this specification are satisfied completely through the hacksaw arrangement described. Itisto be' understood, however, that the invention is by no means restricted to the preferred embodiment described in the foregoing and as illustrated in the accompanying drawing, since various changes and modifications are possible without departing from the scope of the invention as defined in and by the appended claims.

What I claim is:

l. A hacksaw comprising in combination: an invertedly U-shaped frame member, tool-gripping means provided on the extremities of the legs of said frame member, an elongated flexible cutting member stretchable with an operative portion thereof between said gripping means, .storage mer-.zes connected to said frame member at one end thereof for housing a continuous length of said elongated cutting member corresponding to several lengths of said operative portion, tensioning means for said cutting member engaging said gripping means of the framelcg remote from said storage means, and said storage means having an opening in a wall for enabling manual withdrawal of successive portions of said cutting member to be engaged by said gripping means and to be tensioned between said frame-legs by said tensioning means.

2. A hacksaw comprising in combination: a hacksaw frame having sawblade-gripping and tensioning means, a continuous hacksaw blade having an operative portion thereof stretchable and tensionable between said gripping and tensioning means, a magazine connected to said frame at one end thereof for housing said continuous sawblade in a spirally coiled condition, said magazine being in the form of a ring-like case closed by a corresponding cover, said case and said cover. being detachably connected to respective bracket plates, these bracket plates being detachably connected to either lateral surfaces of the frame-leg at said one end of the frame, and said magazine having an opening in a wall for enabling manual withdrawal of successive portions of said sawblade to be engaged by said gripping means and to be tensioned by said tensioning means.

3. A hacksaw according to claim 2 characterized in that said magazine has rotatably disposed therein an annular disc-member engaged by the toothing of the portion of said sawblade coiled in said magazine so as to be rotated by said sawblade portion as the latter is rotated for insertion or withdrawal thereof.

4. A hacksaw according to claim 2 characterized in that said opening is formed by complementary cutouts made in arcuate peripheral walls of said case and said cover, said opening being so disposed as to be substantially in alignment with said tool-gripping and tensioning means.

5. A hacksaw according to claim 1 characterized in that said gripping means comprise two gripping devices cooperating with individual ones of the two legs of said frame member, each said gripping device comprising a sleeve rotatably housing in it a cylindrical body having an axially extendingy slot therein for the reception of an operative portion of said continuous cutting member when withdrawn from said storage means, and a set screw for clamping said cutting member projecting into said sleeve and screw-threadedly engaging said body to be tightened against said cutting member and conjointly therewith to expand said body into firm engagement with said sleeve so as to be immobilized relative thereto.

6. A hacksaw according to claim 5, and further characterized in that each said sleeve has a peripheral slot through which said set screw is passedinto said sleeve, whereby to enable said bodies to be angularly displaced in their respective sleeves for the purpose of adjusting the operative cutting-member portion withdrawn from said storage means into' a desired angle of inclination relative to the legs of said frame member.

7. A hacksaw according to4 claim l characterized in that said gripping means comprise two gripping devices for uripping and clamping an operative portion of said continuous cutting'm'ember when withdrawn from said storage means, onev of said gripping devices being operably connected with said tensioning means; the latter comprising a tension screw adapted for moving said lastmentioned gripping device longitudinally relative to said frame member, said tension screw being mounted in the extreme end of the frame-leg remote from said storage means, the other gripping device being rigidly connected to the extreme end of the frame-leg situated next to said storage means.

8. A hacksaw according to claim 7 and further characterized in that said tension screw for actuating said one of said gripping devices is journaled in a bracket member mounted on the eXtreme end of said frame-leg so as to extend longitudinally of said frame member, said tension screw being threadedly engaged in a nut formed by an extension of the sleeve associated with said gripping device and projecting into the gap between rcausing tensioning of a cutting-member portion stretched between said two gripping devices.

References Cited in the file of this patent UNITED STATES PATENTS 903,495 Parsons Nov. 10, 1908 2,286,530 Fordan June 16, 1942 2,718,909 Heinrich Sept. 27, 1955 2,731,988 Steiner Jan. 24, 1956 FOREIGN PATENTS 228,425 Great Britain Feb. 5, 1925

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