US1817980A - Saw frame - Google Patents

Description

Aug. 11, 1931. H. s F'oRsBERG E'r AL SAW FRAME Filed March l2, 1950 ljratentecl ug. 11, 1931 UNITED STATS rrsN'r Ormes HAROLD S. FORSBERG, OF STRATFORD, AND JOHN DONNELLY, F BRANFORD, CON- NECTICUT; SAD DONNELLY ASSIGNOR TO SAID FORSBERG- SAW FRAME Application led March 12, 1930. Serial No. 435,109.

This invention relates to new and useful improvements in hack saw frames.

A n object of the invention is to provide a saw frame or holder including a readily adjustable arrangement for holding saw blades of dierent lengths and for holding broken pieces of saw blades.

Another object is to provide asaw frame including a one piece non-adjustable back 1o and a leg or lever adjustable along the back whereby blades of various lengths and pieces of saw blades may be held in the frame.

An additional object is to provide a novel means for holding the adjustable part of a saw frame in place.

A further object is to provide an improved form of leo or lever for anchoring one end of a saw blac e.

Other and additional objects and advantages will become more apparent as the description proceeds.

While in the accompanying drawings and following description, preferred embodiments of the invention are shown and def scribed, it will be understood that various changes in construction, combination, and arrangement of parts may be made without departing from the spirit of the invention or the scope of the appended claim.

In the drawings Fig. 1 is an elevational view showing a saw frame in accordance with the invention, a complete saw blade being shown therein.

Fig. 2 is a somewhat similar view, part of the leg or lever being broken away and showing the broken blade attachment in place, holding a section of blade;

Fig. 3 is a sectional detail on the line 3-3 of Fig. 2;

Fig. 4 is a similar view on the line 4-4 of Fig. 3, and;

Fig. 5 shows a slight modification.

Referring in detail to the drawings, at 10 is indicated the baclr of the saw frame or.

holder. Obviously the back is integral with the depending end sections 11 and 12, the latter of which is provided with lugs and perfor-ations 13 and 14 respectively. A handle, 15, in the form of a pistol grip, is molded on the section 12 and in the molding operation the material of the handle, as hard rubber, passes through the perforations 14 and about the lugs 13 whereby the handle is well secured to the frame.

To the lower end of arm or section 11 is secured a small bracket 16 fastened as by rivets 17. An anchoring member 18 is carried by the bracket 16 and is provided with a pin 19 to pass through and anchor or secure one end of a saw blade 20. Y

The opposite end of thek saw blade is secured over a pin 21 carried by a bolt 22 received in the lower end of an adjustable leg or lever 23. Leg 23 is generally U-shaped in cross section as shown in Fig. 3 and its bight portion is perforated as at 24 to accommodate the bolt 22, the sides or arms of the U serving to hold the bolt against turning movement relative to the leg 23. A wing nut 25 serves to move the bolt and draw the saw blade 2O taut after its ends have been passed over the pins 19 and 21.

At its upper end leg 23 includes parallel side portions 26 and 27 between which extends a pin or rod 28 adapted to engage the upper edge of the bar or back 10. The upper edge 29 of the bight portion of the U-shaped leg 23 is spaced from the pin 28 a distance equal to the thickness of back 10. Therefore as wing nut 25 is tightened the leg 23 will tend to pivot. about the edge 29 drawing the pin 28 into tight engagement with the upper edge of the back.

The more pressure put on the lower end of leg 23, the tighter the back 10 is gripped by the edge 29 and pinr28. However, when the nut 25 is loosened fand thev leg 23 is tilted slightly toward the right in Fig. 1, it may readilybe adjusted along the back 10 to accommodate it to diderent length blades or to a broken blade as in Fig. 2. Owing to the means employed, the leg will grip the back in any adjusted position of the leg, and very fine adjustments may therefore be had.

1n Fig. 2 the frame is shown holding a piece 30 of a saw blade. To accomplish this, a broken blade attachment is used. rlhis device comprises a pair of kparallel side members 32 and 33 connected for part of their length as at 34. The side members 32 and 33 extend beyond their connected portion to form arms 35 perforated as shown to hook over the pin 2l. Two devices 3l may be employed, one at each end of a broken saw blade, when both perforated ends of the blade are broken away.

Side members 32 and 33 each have an inclined slot 3G, the slots being arranged opposite each other and a roller or pin 37 operating in the slots. It will be obvious that if the piece of saw blade to be used has one perforated end, that end is hooked over the pin 19 and the opposite end of the blade is inserted between the side members 32 and 33 beneath the pin or roller 37, and the perforated end of the arms is slipped over the pin 2l. The roller 3T may be forced down by gripping its ends between the thumb and forefinger and any tendency of the saw blade to move out of the device 31 will bring about a tendency of the roller 37 to move forwardly in the slots 3G resulting in a tighter clamping of the blade. This last action takes place on tightening of the wing nut 25.

In Fig. 5 is shown a slight modification of the invention. Here but a section of the back 38 of a frame is shown, the top edge of the back being smooth as in the previous form, but the bottom edge being provided with a series of notches as at 39. As is obvious from an inspection of Fig. 5, the upper edge of Ythe bight portion 29 engages in one of these notches assisting the connecting pin 28 whereby the back 38 is tightly clasped as the saw blade is drawn tight by the wing nut arrangement previously described. The leg 23 of Fig. 5 is adjusted along the back by swinging the lower end of the leg to the right in this figure to remove the edge 29 from one of the notches 39 after which the leg may be moved to the desired position.

While the invention has been shown and described in detail, changes and modifications of structure and rearrangement of parts will readily suggest themselves to those skilled in the art, and it is therefore not intended that the invention shall be limited to the arrangement shown, since the invention comprehends all such modifications as fall within the scope of the appended claim.

Having thus described our invention, what We claim is An anchoring means for one end of a saw blade, said anchoring means comprising a leg member, said leg member formed of a single piece of sheet metal longitudinally folded to provide a member substantially U-shaped in transverse section and comprising a pair of parallel arms and a bight portion connecting saidrrarms, said bight portion perforated near its lower end, a bolt extending transversely of said member between the parallel arms and through said perforation, means on said bolt to which a saw blade may be

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