US1493931A - Auxiliary saw-blade holder - Google Patents

Description

FJI

Patented May 13, 1924.

UNITED STATES PATENT OFFICE.

JOFN E. GASSTROIYL, OF YORK, N. Y., ASSIGNOR O'F ONEJ-IALF T0 HENRY C.

KARLSON, BOROUGH O'F HASBROUCK HEIGHTS, NEV

AUXILIARY saw-BLADE HOLDER.

Application led April 12, 1922. Serial No. 551,753.

To @ZZ fwzom t may concern.'

Be it known that I, JOHN E. GAssTnoM, a citizen of the United States, and aresident of the borough and county of Bronx, in the city and State of New York, have invented certain new and useful Improvements in Auxiliary Saw-Blade Holders, of'which the following is a specification.

This invention relates to saw holders, and it more especially appcrtains to a devicede signed for holding the end of a broken hack-saw blade.

The main object of the invention is to provide an improved device of the character described, for positively holding a broken saw-blade by friction, in a manner superior to what has hitherto been attempted, so as to obviate fracturing the said blade anew, and without depending upon means engaging the latter edgewise.

Another object is to produce a device of the nature set forth, wherein the saw-blade held thereby is subjected to clamping action on both its narrow edges as well as on the broad sides thereof.

A further object is the production of a device of the type specified, so constructed that the forces which exert the clamping effect upon the saw-blade act at right-angles to each other, while the yplane of movement of the means originating these forces is parallel to but in offset relation to the blade.

Still another object is the provision in a device of the class mentioned, of a. clamping element cooperating' with a saw-blade receiving member*attachable to a hack-saw frame, in a manner to enclose the saw under pressure for imparting rigidity thereto.

A still further object is to furnish a practical device of the kind referred to, composed of the fewest possible parts compatible with the satisfactory working thereof, light but strong and durable, and which `shall permit the saw-blade to be readily inserted into it or withdrawn therefrom, besides being amenable to low cost of manufacture.

Other objects and advantages of the invention will became apparent as the specification proceeds.

With the aforesaid objects-in view, the invention consists of the novel combinations and arrangements of parts hereinafter described inA their preferred embodiments, pointed out in the subjoined claims, and illustrated on the annexed drawing, wherein like parts are designated by the same reference characters throughout the several views.

Supplementary fixtures heretofore employed for connecting the ends of broken hack-saw bla-des to their holding frames, have mostly always consisted of attachments employing either a screw bearing directly upon the top edge or back of the saw, or some contrivances coacting with the toothed bottom edge of the saw-blade which were intended to prevent the same from becoming detached. But, as no attention was paid to the strict confinement of the saw-blades flat wise or sideways, it was possible for the latter to have a certain lateral freedom of movement, which however slight, produced a detrimental effect at each working stroke, permitting the blades to iiex at the point of seizure. The result was, that not only were the hack-saw blades caused to break again, but their holders soon showed signs of wear and become unmanageable. The several disadvantages arising from the employment of the old forms of hack-saw holders, above pointed out, are done away with by the present invention.

Generally described, the invention under consideration includes in its organization a carrying member attachable to either one of the inner anchorages of a hack-saw frame and having at` its longitudinal top and bottom edges counter bent portions terminating in oppositely directed Haring lips. The upper one of these portions is' threaded for a screw which actua'tes a clamping saddle taking over the former and provided with depending wings arranged to eoact with the before named lips: A gap is formed intermedia'te the body of the member and one of the wings, in which gap is received the broken end of a hack-saw blade that is confinedy under pressure side and edgewise when the actuatingscrew is tightened. The latter is disposed laterally of the blade substantially in parallelism therewith.

The advantages of the invention as here outlined are best realized when all of its features and instrumentalities are combined in the one and same structure, but, useful devices may be produced embodying less than the whole.

It will be obvious tothose skilled in the art to which the invention appertains, upon becoming conversant with the details thereof, that the same may be incorporated in several different constructions. The accompanying drawings, therefore, is submitted merely as showing the preferred exemplification of the invention.

In the said drawing Figure I is a fragmentary perspective view of a hack-saw frame and saw-blade, showing the improved holder applied thereto;

Fig. II is an enlarged detached front view of this holder;

Fig. III is an end view of the same, looking from the left hand side of Fig. II; and

Fig. IV is a view similar to the one last named, but looking from the rear thereof.

Referring now to these views for adetailed description of the invention, it will be noted that the known parts of a hacksaw frame and vsaw-blade wherewith this clamping holder coacts, and which are not claimed as pertaining to the present improvement, except in so far as they may form therewith legitimate combinations of elements capableof yielding novel and useful results, have been indicated by dot-and-dash lines and are designated herein by reference letters.

Thus of the latter, A denotes the back part of a well known type of hack-saw frame, composed of one or more sections and having the usual depending arm portions, one of which is shown at B. At the free end of this arm is a guide socket C fora square sided spindle D, the edges E whereof have threads cut therein to receive a wing nut F. The inner necked-down terminal G of the guided spindle carries a pin or stud H engageable with one of the openings ordinarily provided at the extremities ofthe saw-blade J. When the wing nut is tightened, it pulls upon the spindle D and the therewith conected saw-blade so as to put the proper workings tension thereon in a manner peculiar to implements of this nature.

The parts hereinafter referred to, constitute a characteristic embodiment of the invention as applied to the outer end of a hack-saw frame, used by machinists, plumbers and kindred mechanics. However, the improvement upon the existing structure, later on to be described, can equally as well be applied to the inneror handle end of such frames.

The principal reason why the breaking of a` hack-saw blade generally occurs, is that the operator fails to guide the saw properly, in particular, at such times, as the direction of motion of the saw-holding frame is being reversed, and the breakage takes place to a great extent at or near either terminal of the saw-blade. In order to carry the broken extremity of the saw-blade and couple the same to the thereto appertaining end of the main holding or supporting frame, the auxiliary clamping fixture is made to connect up the former with the latter'.

In the present exemplitication of the invention, the improved device for holding a hack-saw blade near the end thereof where it has been broken, consists of a plate or web-like member 11. One part, substantially half of the latter, constitutes an ear 13, which as shown is provided with an aperture 15. The same is adapted for placing or hooking over the stud H that projects out from the tensioning spindle D previously referred to. Extensions or bent portions 17, 19, which are offset from each other, project from the upper and lower longitudinal edges 21, Q3, respectively of the member 11. Lips 25, 27 constituting continuations of the said bent extensions 17, 19, reach therefrom on opposite sides of the said member, towards a median plane passing thru the same at right angles to its web. It will be perceived upon inspection of Fig. III, that the upper extension 17, that projects 'rearwardly from the web member 11, according to the location thereof depicted by Figs. I and III, is wider than the lower one 19, which may be formed by merely bending the front lip 27 upwardly. The latter is inclined away from the web of the member 11, in an upwardly outward direction and by preference has its free edge 29 terminating on a substantially straight line. On the other hand, the rear lip 25 has the lower unsupported edge 31 thereof approximately semi-circular in shape, and extending downwardly outward with respect to the other or opposite side of the same web of the member 11. The interrelative arrangement of the said sloping lips is such, that the outer surface of the rear lip 25 is parallel, or nearly so, with the inner face of the front lip 27, for a purpose that will be later on pointed out. Thru the cent-re of the bent portion 17 is provided an internally threaded opening 33, the contour of which for a certain increment thereof, intersects the internal sides of the web portion of the member 11 and the rear lip Q5, which sides are correspondingly threaded and form the longitudinal boundaries of a gap therebetween. By virtue of this construction, a screw inserted into the said opening 33, will receive additional support along those edges thereof which are in contact with the mated, fractional threads formed in the sides of the gap hereinbefore referred to.

Surmounting the said portion 17, is a clamp or saddle element which consists of a central top part 35 having wings 37, 39 depending from the front and rear edges thereof. As will be noticed, a slight interstice 40 occurs between the underside of the top part of the saddle and the upper face of llO the extending portion 17, the reason being that the parts last mentioned are not intended to come into actual contact one with the other. The interior face of the wing 37 coacts with the external side of the rear lip 25, while a bevel or chamfer 41 adjoining the lower or free edge of the exterior side of the wing 39 cooperates with the internal surface of the front lip 27. From the foregoing it will be apparent, that the said lips 25 and 27 constitute guide flanges for the wings 37, 39 of the element 35. This arrangement affords an interrelative parallel movement between the inside of the wing 39 and the opposite front face of the members web, which surfaces as shown, are situated at uniform distances apart at top and bottom, suflicient to receive flatwise between them the blade of the hack-saw J.

The manipulating portion 43, of a thumb screw bears with its underside upon the upper face of the clamping element 35, and has its shank 45 passed thru a clearance hole 17 in the middle part of the saidface, being in threaded engagement with the before mentioned opening 33 and coincidentally with the partial threads cut in the opposed sides of the web member 11 and the lip 25, respectively. lVhen this screw, which constitutes the actuating means for the clamp element is tightened it forces the latter down over the similarly bevelled guiding surfaces of the lips 25 and 27, by reason of which yan even approachment is caused of the inner face of the wing 39 towards the opposite side of the web member 11, thus narrowing the gap intervening between the same. This contraction it will be understood, takes place in two directions, namely, sideways as well as edgewise, due to the combined vertical and lateral movements imparted `to the said saddle element 35. From this it will be apparent, that a saw-blade held intermediate the parts 1].-39 and 121-35, as coacting jaws, will be so securely gripped all around, that there will not be any chance for it to become yshaky or Awork loose. By virtue of this fact, the teeth on the underside of the saw-blade, which are forced down' against the lower extending portion 19, cannot produce any cutting effect, but are held in a relatively fixed position. Furthermore, due to this rigid clamping of the saw-blade, the same is prevented from flexing sideways, which considerably reduces the liability thereof to fracture at the point where it leaves the holding member.

It will be observed, that the rear wing 37 is slightly shorter than the underlying lip 25, which enables the operator when loosening the saddle 35 from the saw-blade, incidentally to removing or inserting the latter, to conveniently place his linger nail under the edge of the wing to pry it up, after the screw 45 has been slackened.

Altho not specifically illustrated, it is obvious that this clamping device can be used to hold an unbroken saw-blade as well as one that has been fractured. In such instances, the usual opening in the end of the sawblade and also the aperture 15 of the mem bers ear 13 are conjointly hooked over the stud H of the tension spindle E. An arrangement of this kind will more perfectly maintain the saw rigid, adding to its usefulness and longevity. Besides, if employed at both ends of the blade, it will enable the Workman to accurately guide the same, which is of particular importance while doing fine or closework.

Vhile a certain preferred embodiment of this device has been shown and described, it will be understood that changes in the form, arrangements, proportions, sizes and details thereof may be made, without departing from` the scope of the invention as defined by the appended claims.

Having described my invention 'wh at I desire to secure by Letters Patent and claim, 1s:--

1. An auxiliary holding device comprising in combination with a saw frame and the blade thereof, a saw carrying member connectible to the frame, an element coacting with said membery to force the saw blade thereagainst, and actuating means for said element disposed in sidewise offset relation thereto and to the` member, said means being arranged tomove at right angles to the lateral movement of the element and to the line of the tension on the saw and clampingly engaging the latter both edgewise and laterally.

Q. An auxiliary holding device comprising in combination with a saw frame and the blade thereof, asaw supporting member attachable to one end of the frame, an element adapted to engage the saw blade, and means cooperating with said member .for causing said element to force the blade sidewise thereagainst, said means being located at the side of the member remote frbm the element and acting in a plane at right angles to that in which the saw is tensioned and clampingly engaging the latter both edgewise and laterally.

3. An auxiliary holding device comprising in combination" with a saw frame and the blade thereof, a saw sustaining member anchorable to one of the inner ends of the frame, an element engaging the saw blade sideways, and meansincluding a screw for causing said element to force the blade flatwise against said member, said means being disposed in substantially right angular relation to the lateral movement of the element on the side of the member opposite to that engaged by the saw blade and movable as well substantially perpendicularly to the direction in which the latter is tensioned and clampingly engaging the saw both edge Wise and laterally.v

L An auxiliary holding device comprising in combination with a saw frame and the blade thereof, a saw retaining member capable of being linked up with the frame, an element adapted to engage thc saw blade both edgeivays and sidewise, and actuating means for said element causing the same to clamp the blade between it and said member, said means being disposed by the side of and parallel with the latter while operating at right angles to the .lateral movement of the element and to the line in which the saw blade is teusioned and clampingly en-v gaging the saw both edgewise and laterally.

5. An auxiliary holding device comprising in combination with a saW frame and the blade thereof, a carrying member capa` ble of being joined to one end of the frame,

oppositely extending guides disposed 1n sideivise offset relation to said member, an element coacting with both of said guides engageable with the san' blade, and means actuating said element by forcing the saine in engagement with the guides to cause it to clamp the blade flatn'ise against said member.

6. An auxiliary holding device comprising in combination with a saw frame and the blade thereof, a saiv supporting member connectible to the frame, edge portions thereof lforming oppositely extending guides, a clamping element for the sauv blade cooperating with said guides, on the outer side of one and on the inner side of the other, and means coacting with said member intermediate the guides thereof capable of e1;- erting a pressure upon said element.

7. Au auxiliary holding device comprising` in combination with a saw frame and the blade thereof, a saw retaining member attachable to one of the inner extremities of the frame, said member including an outwardly bent portion formed with a guide reaching from vthe upper edge thereof, an element having parts respectively arranged to take over said guide and the saw blade capable when one part `thereof is forced down upon the guide to cause its other part to clamp the blade against the member, and actuating means for said element.

8. An auxiliary holding device comprising'in combination With a saiv frame land the blade thereof, a saw sustaining member anchorable to the frame provided with ran inclined guide extending in spaced relation to the lower edge thereof, an element formed to coact With said guide capable of engaging the saw blade flatwise, and screvv means offset sideivise of the guide adapted to cause said element to force the blade against the side of said member, said means acting at right angles to the line of tension on the saw blade to move the element diagonally to such line.

9. An auxiliary holding device comprising in combination With a saw frame and the blade thereof, a saw carrying member engageable With one of the inside anchorages of the frame, similarly inclined guides re-bent in counter directions ,from the. longitudinal edges of said member forming gaps on opposite sides thereof, an element taking over the member including parts cooperating ivith said guides, one of said parts coacting with the saw blade in one of said gaps, and means entering the other gap capable of applying pressure on said element to force the first mentioned part in clamping engagement With the blade.

ll0. An auxiliary holding device comprisingin combination with a sau7 frame and the blade thereof, a carrying member` taking under the toothed edge of the blade, a clamping element adapted to descend upon the upper edge of the latter, interengaging flanges causing said member and said element to embrace the blade by moving thereagainst both laterally and in a vertical direction, and means serving to tighten said flanges together.

JoHNVE. eiissTaoM.

Images