US1599642A - Saw frame - Google Patents

Description

Sept. 14 1926. 1,599,642 J. E. BURBANK SAW FRAME' Filed Jam 25, 1926- JEBurZmz/a,

Patented Sept. 14, 1926.

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caries E. BURBANK, or FLAGSTAFF; MAINE.

sAw FRAME.

Application filed January 23, 19'2'6. Serial at. 83,361.

This invention relates to saw frames and more particularly to the construction of frames of that typeof sawusually employed for cutting log wood.

An important object of the invention is to provide means for tensioning the frame to hold the saw blade therein of such character that the frame may be very readily inserted and removed and at the same time the frame is free from portions which, when engaged by obstructions, will tend to release the saw blade and permit it to escape from the frame.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawing, wherein Figure 1 is a side elevationpartially in section of a sawframe constructed in accordance with my invention;

Figure 2 is a plan view thereof;

Figure 3 is an enlarged detail view showing the manner of mounting the longitudinal bar in the end members;

Figure 4 isan enlarged detail View taken on the line 44 of Figure 1;

Figure 5 is an enlarged detailview showing the connection between the links and the operating lever.

Referring now more particularly to the drawing, the frame includes end members and 11, each provided intermediate their ends in adjacent faces thereof with notches 12 and 13 for the reception of the ends of a longitudinal brace 14. The end members 10 and 11 adjacent corresponding ends thereof have pins 15 and 16 for engagement with the ends of a saw blade 17 in the usual manner. The opposite ends of the end members 10 and 11 are connected by a tensioner 18, now to be more particularly described.

The tensioner includes a link 19 having at one end an eye 20 for engaging the upper end of the end member 11 which constitutes the handle of the saw frame, a second link 21 having an eye 22 for engagement with the upper end of the end frame member 10 and a lever 23 connecting these members. The link 21 is formed in two sections, one of which provides an eye 22 and has at its inner end a yoke 24 slidably receiving the second section 25. This second section is provided with series of longitudinally spaced openings 26 through which a pin 27 may be directed outwardly of the yoke 24 to determine the effective length of the link. The inner end of the section is downturned, as at 28, and extends between spaced arms 29 formed up'oiithe lever 23 bein connected thereto by a pivot 30. The outer or forward end of the link 20 is upturned, as at 31, and likewise directed between the arms 29 being connected thereto bya pivot 32. The rear end of the lever 28 is formed with a downturned end 33 operating adjacent the link 19 and having upon its face confronting the link ahratchet shoulder 34. Pivoted to the downturned end 33 is an arm 35 having a second ratchet shoulder 36 for engagement with the link.

It will, of course, be understood that due to the connections of the lever 23 to the links 19 and 21, the upper ends of the end members 10 and 11 may be drawn together or permitted to separate. When these upper ends are drawn together, the frame is tenwere sioned as the frame members tend to rock about the longitudinal bar 14 and are rcstrained by the blade 17 When the shoulder 36 is in engagement with the link 19, the tension is just sufficient to hold the frame of the saw in assembled relation while, when iii) the shoulder 34 is engaged, this tension is increased to apply the proper tension to the saw blade. While the notch 36 is engaged,

the frame may be sprung by applying weight thereto for a sufficient distance to permit the saw blade to be removed and replaced, thus permitting the use of the bar 14, such as is illustrated instead of the usual bar which is mortised into the end members. Attention is directed to the fact that the position of the lever 23 is such that it is protected from accidental disengagement by contact with the brush and other obstructions such as are met with in using a saw of this character for cutting pulp wood or the like in the forest. At such times the arm 35 may be swung back upon the lever, as indicated in dotted lines in Figure 1, so that it will not tend to catch upon obstructions.

It will, of course, be understood that the construction hereinbefore set forth is obviously capable of a certain range of change and modification without materially departing from the spirit of the invention and I accordingly do not limit myself to such specific structure except as hereinafter claimed.

I claim In a saw frame of the type described, end members, a longitudinally extending bar up on which the end members are loosely fulcruined intermediate their ends, a saw blade connecting corresponding ends of the end members, a link connected with the opposite end of each of the end members, a lever connecting said links and securable in a position Where the frame is tensioned to thereby tension the saw blade or to a position Where the tension is removed from the saw blade While maintaining the sections of the frame in assembled relation including an angular end on said lever having a shoulder adapted to engage With one of said links and an arm pivoted to said angular end and having a second shoulder for engagement With said link, said arm being swingable about the pivot thereof from an operative position Where it aligns with the angular end of the first named arm to an inoperative position Where the shoulder thereof engages the upper surface of the lever to support the arm in inoperative position.

In testimony whereof I hereunto afiix my signature.

JAMES E. BURBANK.

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