US2436743A - Saw frame - Google Patents

Description

Feb. 24, 1948, A. H. CARLSON S AW FRAME Filed April 29, 1944 R m N E v m Patented Feb. 24, 1948 ire srarss SA-W Andrew H. Carlson, Worcester, Mass, assignor to Barker Manufacturing Company, Worcester, Mass, a. corporation of Massachusetts Application April 29, 1944', Serial Noy53I3348 3 Claims.- (Cl. ES -.33) l; 2

This invention relates to saw frames and the To control the position of the arm there is proobject is to provide-a frame of simple andrugged vided: between the flanges M of thechan-ne'l (the construction which permits the blade to be word. flanges here includes adjacent portions quickly'lnserted in'the frame and. brought to the of the: extensions of, the flanges proper to form proper state of tension and. as quickly releasedthe checks 2!!) a cam or eccentric 21, conventherefrom. The frame maybe similar to those iently of substantially elliptical form as shown commonly used with hack saws and thus genwith its center of rotation. adjacent one end of erally of U-shape with a manipulating handle at theminor axis. which cam opposes the upper end one end, for purposes of illustration there is 29 of arm 24,. that end. desirably being ofiset forshown in the accompanying drawings and will wardly as seenin. Figs; 2 and 3-. A shaft 3! (see hereinafter be described by way of example a Fig. 4;) isjournalledzmthe flanges t8 of the chanconstruction. of such trame suitable for a hack no]; on which shaft the cam. 2.! is non-rotatably saw. In the drawings: mounted. A head 33 on one end of the shaft over- Fig. 1 is a side elevation of the frame with the lies. one flange of the channel and, on the other blade in place; end an operating lever 35 is fitted, which lever Fig. 2 is a view of the handle end of the frame preferably'takes the form of an arm oriented with with parts broken away; respect tothe: cam. Thus with. the lever arm 35 Fig. 3 is a view similar to Fig. 2 showing the extending horizontally and forwardly in the full parts in another position of. adjustment to permit line position of Fig. 1, the high portion of the the blade to be removed from the frame or incam opposes the end 29 of the arm, as illustrated serted therein; and in. Fig; 2; with the lower end of the arm swung Fig. 4 is a section on the line 4-6 of Fig. 1. to the right in the figures to put tension on the Referring now to the drawings and more par"-- blade, but if moved to the dotted line position of ticul'arly to Figs, 1- and 2 the frame there shown Fig; 1 the low portion of the cam opposes the arm, resembles the conventional hack saw frame of as seen in Fig- 3; permitting the arm to swing U-shaped form and it may be of adjustable clockwise sothat the blade may be released, The length to accommodate blades of dilierent surface of the arm which opposes the high point lengths, and the portion at the left of the figure of the cam, as seen in Fig. 2, is preferably formed is herein shown as comprising an angular memon an arc which fits the surface of the cam in this ber of fiat metal of sufiicient width to provide the 30 position throughout an extended are 3'! to prodesired rigidity having a depending arm 6 with vide a secure bearing between the parts in this studs 8 carried thereby and extending at right position.

angles one to another, to which the forward end The frame is provided with a manipulating of the blade may be secured either to lie in the handle 39, herein shown as of the pistol grip type, plane of the frame or at right angles thereto. which may be attached to the frame as by means This angular member comprises also the horiof a tang 4i fitting into the channel and secured zontal portion l0 forming the forward portion of thereto by the welds 43. The eccentric 21 is disthe back of the frame which telescopes into a posed between the end of the tang and the offset channel member l2 forming the cooperating porend 29 of arm 24, permitting the grip to be position of the back and wherein it is secured in the tioned closely adjacent the frame proper.

desired position of adjustment by any suitable In the construction shown the cam shaft 3| or usual means, as, for example, the cross-pin may rotate freely and indefinitely. Hence, re- !4 shown adapted to engage the notches I6 in ferring to Fig. 1, the lever arm 35 may be turned the arm l0. either clockwise or counterclockwise in passing The flanges I 8 of the channel l2 toward the from the full line position to the dotted line poright of the frame are extended downwardly to sition or vice versa. The movement from the provide cheek portions 23 between the lower parts position of Fig. 3 to the position of Fig, 1 is for of which is pivoted on cross-pin 22 an arm 24 a full 180 providing for easy operation yet for having at its lower end the studs 26 to engage the powerful tension on the blade. The handle 39 is end of the blade. When this arm is held in the unobstructed and rigid with the frame. This not position of Fig. 2, it holds the blade under the deonly facilitates use of the saw but the frame also sired tension. If released so that it is free to may be held by the handle in an easy and comswing clockwise to the position of Fig. 3, the fortable grip while the fingers of the other hand blade may easily be removed from the studs 8 and manipulate the lever 35. The cam 21 and its co- 26 or a blade placed in position on such studs. operating follower are concealed and protected.

3 The cam-actuating lever 35 may lie along the side of the channel out of the way and is not likely to catch or foul while it is easy of access.

I am aware that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, as in fact clear in several matters from the description itself. Reference is to be had to the appended claim to indicate those principles of the invention exemplified by the particular embodiment described and which I desire to secure by Letters Patent.

I claim: 1. A saw frame having a back having a hand grip secured thereto, which back is formed by a channel, the flanges of which are extended at one end of the frame to provide cheek portions, blade-supporting arms extending from the channel at the ends of the back and one of which arms is pivoted intermediate its ends between the cheek portions, a shaft journalled in the flanges of the channel adjacent the upper end of the said one arm, an eccentric on the shaft housed between the flanges and capable of complete and continued rotation and at all times received within the outlines of the flanges, the eccentric opposing the said one arm adjacent its upper end, an end of the shaft projecting to the exterior from one flange, an operating lever at the outer side of the channel fixed to the shaft in oriented position relative to the eccentric and overlying the flange within the outline of its margins when the rise portions of the eccentric oppose the arm. 2. A saw frame having a back formed of a channel, the flanges of which are extended at one end of the frame to provide cheek portions, a hand grip having a tang entering between and secured to the flanges at said one end of the back, a shaft journalled in the flanges and supporting an eccentric closely adjacent the inner end of the tang, the eccentric being housed between the flanges and at all times received within the outlines thereof, blade-supporting arms extending downwardly from the back at either 4 end and including at the handle grip end an arm pivoted intermediate its ends between said check portions, the upper end of the arm being offset to oppose the eccentric, an end of the shaft projecting to the exterior of the channel and having an operating lever fixed thereto which overlies the flange within the outline of its margins when the rise of the eccentric opposes the arm.

3. A saw frame having a back having a hand grip secured thereto, which back is formed by a channel, the flanges of which are extended at one end of the frame to provide cheek portions, blade-supporting arms extending from the channel at the ends of the back and one of which arm is pivoted intermediate its ends between the cheek portions, a shaft journalled in the flanges of the channel adjacent the upper end of the said one arm, an eccentric on the shaft housed between the flanges and at all times received within the outlines thereof, the eccentric opposing the said one arm adjacent its upper end, an end of the shaft projecting to the exterior from one flange, an operating lever at the outer side of the channel fixed to the shaft in oriented position relative to the eccentric and overlying the flange within the outline of its margins when the rise of the eccentric opposes the arm.

ANDREW H. CARLSON.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PATENTS Number 7 Name Date 1,663,076 Garner Mar. 20, 1928 Re. 20,252 Priest Jan. 26, 1937 2,194,494 Carroll Mar. 26, 1940 2,308,354 Clemson Jan, 12, 1943 FOREIGN PATENTS Number Country Date 187,525 Great Britain Oct. 26, 1922 554,750 France Mar. 8, 1923

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