US990839A - Blade-clamp for saw-frames. - Google Patents

Description

R. GOPFRON.

BLADE CLAMP r0 SAW FRAMES.

APPLICATION FILED JAN. 23,1911.

Patented May 2, 1911.

e f from RUTHERFORD COIFBON, 0! WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOB O1 ONE-HALF TO ARTHUR GOWSILL, OF W ASHINGTON, DISTRICT OF COLUMBIA.

BLADE-CLAMP FOB SLW -FRAKES.

Specification of Letters intent.

Patented May 2, 1911.

Application filed January 23, 1911. Serial No. 604,185.

in c

% his invention relates to improved means for rigidly holding a saw blade in its frame and more particularly to .a new and novel device whereby asection of a broken blade may be utilized in cases of emergency.

The invention has for a further object the provisionof an adjustable griipping device arranged upon the. handle 0 the saw, said comprising a tubular member and flexible metal strips having gripping jaws formed on one of their ends and threaded to receive an adjusting nut which IEengages with the ends of said tubular mem- Still another objectof the invention is to rovide means for preventing the jaw memrs from turning or rotating in the tubular member during the operation of the saw. Another object of the invention resides in the provision of means for rigidly holdin a section of a broken saw b ade in the ad ustable frame of aback-saw, said device I being very quickly adjustable to secure or release the saw blade and extremely efiicient,- reliable and durable in use.

With the above andother objects in view, the invention consists'of the novel features of construction, combination and arrangement of parts hereinafter fully described and claimed, and illustratedv in the accompanying drawing, in which- Figure 1 is a side elevation artly in section illustrating my improved blade holding device; Fig. 2 is a section'taken on the line 2-2 of Fig. 1; Fig. 3 is a section taken on theline 33 of Fig. 1; Fig. 4 is a section taken on the line 4--4 of Fig. 1; and

. Fig. 5 is a section taken on the line 5-5 of eferring .in detail to the drawing 5 designatesthe handle of the saw in which the-frame bar sections 6 is rigidly sec'uredby means of the rivets or other ana'lo ous fastening devices 7. The other frame-v ar section 6 is bent intermediate of its ends and disposed at right angles.

One of the ends of the frame section 6' is normally disposed in alinement with the rigid frame bar 6. Asubstantially U-shaped late 8 is arranged upon these sections and 18 provided in its intermediate portion with a plurality of openings 9 to receive the studs 10 one of which is fixed in the extremit of v the frame sections 6 and 6'. It wil be readily seen that the frame may be easily and quickly adjusted by moving the frame bar sections in the U-shaped plate and ositioning the studs in the openings 0 the plate 8. The lower corners of the plate 8 at each end thereof are connected by means of the rivets 11 which support the bar sections in their sliding movement and prevent the entire disconnection of the same from the plate 8. Upon the other end of theframe section 6 a sleeve 12 is secured and in this sleeve a bolt 13 is slidably mounted, the head of said bolt having a lug 14: formed thereon for engagement in a recess 14 in one end of the seeve as shown in Fi 1 thus holding the bolt against rotation. %he end of the shank of said bolt is flattened and has fixed thereto a laterally dis osed pin 15 which extends at a slight ang etoward the end of the frame.

The 'parts above described are all of common construction and in the usual form of adjustable saws, a bolt similar to the bolt 13 is also arran ed upon the lower end of the handle 5. he pins on these bolts are adapted to be inserted through 0 enings provided in the ends of the saw b ade n the event that the blade should be broken, it must be replaced by a new one which cannot always be conveniently obtained,

thus causing considerable loss of time. It is the object of the present invention to utilize one of the sections of the broken blade so that the sawin operation may be continued. To this end rovide the member 16 which is formed with a longitudinal bore or openin 17. This member 16 is further provide with an exterior flan e or plate 18 which is formed with the s oulders 19 and fits within a recess or socket 20 of similar form in the end of the handle 5 thereby preventing longitudinal movement of the member 16. Suitable fastenin screws 21 extend through the handle and the plate 18. The forward end of the tubular member 16 is formed with a flared or enlarged mouth, 22 the inner wall of which col on the saw blade, and the other of said with respect to theframe' in shaped plate 8.;

. 16, vand the' teeth 2 jaws having a single tooth 28' which bites the opposite edge of the saw blade as the flexible metal strips 24 are moved longitudinally in the tubular member 16. The outwardly extending diverging forward end portions of the strips 24 are provided w1th long1- tudinal'teeth or corrugations 29 whlch'engage with the serrations 23 on the inner periphery of the flaredv mouth 22 of the tubular member 16 and act to prevent any rotation of the jaw members; within said tubular member so as to absolutely prevent any movement whatever of the saw blade of the saw.

From'the above description, taken in connection with the accompanying drawing it is thought that the construction and operation of the device'will be obvious;

Thebladeso'f hack-saws such as are com-' monly employed for sawing metal, meat "bones or other material more often become broken owing to their brittleness than worn out throughconstant use, and by means of my improved device, I mm to overcome the necessity of providing an entirely new saw blade when the one in use is accidentally broken. One portion of the broken blade having the aforementioned opening in its end is engaged with the pin 15 on the bolt 13 in one end of the saw frame and the other end of the blade portion is disposed between the grippingjaws 26 after the frame sections have been The operator now mani ulates thenut 25 and the flexible metal strips 24 are moved throu h the tubular member and 28 of the jaws caused to bind or gIlBllBOIl opposite edges of the blade as the diverging portions of the strips'24 move uponthe inner periphery of the flared mouth 22. In this manner the broken blade section may be jeasily and securely clamped in the saw frame and the operation continued without undue lo ssof time which would be occasioned in procuring anentirely new blade. w

From the foregoing it willbe seen that I have produced a device which is extremely convenient and'efiective'in practical use and will entirely eliminate the deficiencies which glroper angle the operation properlyadjusted 'in the U- "eas exist in devices of this character as at present constructed. The expense incident to the frequent breakage of the saw blades is also eliminated and owing to the wide range of adj ustability of the frame in connection with my improved fastenin device, one blade may be used for an inde nite time even after ithas been broken. The main object of my invention however resides in the fact that in cases of emergency where the completion of the work without delay is imperative, considerable loss of time is obviated.

Thedevice may be produced at a comparatively low cost and is also extremely durable in use.-

The sleeve 12 is preferably provided with a'plurality of recesses 14 which receive the lug 14 on the bolt head whereby the saw blade B may be angularly adjusted in the frame at any angle, the flexible stri s 24 loosened in the tubular member 16 an turn therein to dis ose" the gripping'jaws at a d or engagement with the saw a e.

While I have shown and described the preferred construction and arrangement of the various parts it willvbe understood that the device is susceptible of considerable modification without departing from the emential feature'or sacrificing any of the advantages thereof. 1

Having thus described the invention what is claimed is: i

1. A device of the character described comprising a tubular member rigidly fixed to a saw handle, flexible metal strips loosely disposed through said member, a wing-nut for threaded engagement upon said strips and engaged with one end of the tubular member, said strips at one of their ends diverging to form opposed jaws for gripping engagement upon opposite ed es of the saw blade, the ad ustment of sai wing-nuton the strips drawin said, jaws together to securely grip the b ade between them.

2; device of the character described comprising a rigidly held tubular member having a flared mouth at one end, flexible metal threaded strips of substantially semicircular'form disposed through said member, anadjusting nut threaded on said strips enwith one end of said tubular member, said strips diverging beyond the flared end of said member and having threaded extremitiesbent to form opposed jaws, teeth formed on one of the jaws for engagement with the teeth of a saw blade disposed between'said jaws, and a'single tooth formed on the other jaw for gripping engagement with the opposite edge of the blade, the adjustment of said nut on the threaded metal strips drawing said strips through the tubuthe jaws into clampment with t e saw blade.

evice of the character described lar member and movin mg enga comprising a rigidly held tubular member outwardly flared at one end, said flared por tion havin serrations formed on its inner wall, flexib e metal strips disposed through said tubular member, a portion of said strips being threaded, a wing-nut engaged 'thereon and disposed against one end of said tubular member, said strips diverging beyond the flared end of said member and having longitudinal teeth for engagement with the serrations in the flared end of the member, and opposed jaws formed on the diverging ends of the strips for ipping engagement upon opposite edges 0 the saw blade arranged between them.

4. The combination with an adjustable saw frame including a handle, of a tubular member rigidly fixe in said handle flared at one end and provided on the inner periphery 20 thereof with serrations, flexible strips disposedthrough said tubular member and having diverging end portions provided with longitudinal teeth for engagement'with the serrations of said member, opposed jaws formed on the extremities of the diverging ends of the strips, said jaws being bifurcated to receive a saw blade, means formed in the bases of said bifurcations for gripping engagement upon opposite edges of the blade and means arranged upon said flexible strips and engaged with the end of said tubular member to move the strips through said member and draw the jaws into gripping engagement with the blade.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

RUTHERFORD COFFRON. \Vitnesses:

M. C. LYDDANE, G110. S. LIVINGSTON.

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