US2660974A - Hack saw guard - Google Patents

Description

L. S. SWAIN HACK SAW GUARD Dec. 1, 1953 Filed June 30, 1952 L/oyd S. Swain INVENTOR.

Anmqs Patented Dec. 1, 1953 esteem OFFICE HACK SAW GUARD Lloyd S. Swain, Martinsville, Va., assignor to 1 Kathleen R. Swain; Martinsville, Va.

Application June 30, 1952, Serial No. 296,286

:Li' 3 Claims.

Thisjnvention relates to a haoksaw guard and particularly to a guard to be detachably mounted on the'handle of a hacksaw between the hand of the operator and the blade of the saw.

In the utilization of hacksaws or the like saws having bar or open frames holding tension blades therein, there is considerable danger that the hand of the operator will be injured if the blade should break or if the blade should suddenly saw through an object and allow the knuckles of the operator to come into contact with the recently sawed piece or with a portion of the broken blade.

The present invention provides a guard which may be detachably connectedto the handle of an open frame saw, so that it is interposed between the hand of the operator and the work piece and the blade in the saw. The guard is preferably of a two-lobed disk variety having basket shaped lobes which flare outwardly and rearwardly to substantially inclose the hand of the operator.

It is accordingly an object of this invention to provide a guard for a hand of a saw operator.

It is a further object of this invention to provide a saw guard which may be detachably mounted on the handle of an open framed saw.

It is a further object of this invention to provide an improved clamping means for securing a guard to a saw.

Other objects and many of the attendant advantages of this invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

Figure l is a perspective view of a hacksaw with the guard in place;

Figure 2 is an elevation of the guard taken from the hand protective or rear side; and,

Figure 3 is a cross section taken substantially on the plane indicated by the line 33 of Figure 2 and showing further details of the mounting plan.

In the operative disclosure according to the invention, a saw handle It has rigidly attached to th forward side thereof a back member I2 in which is detachably mounted an extensible arm l3 having at the end thereof a barrel IS in which is slidably mounted a tension member l8 which is controlled by means of a wing nut 20. A blade holder 22 is swivelly mounted at the lower side of the handle In so that a blade 24 may be secured between the members I8 and 22 and tensioned by means of the wing nut 29.

The handle I is usually provided with a hand grip 26 and a forward strain member 28. Such construction is normal to hacksaws, meat saws, copin saws and many other open frame type of saws and is no part of the present invention.

The guard of the present invention comprises a disk having a cutaway or narrow central portion 39 which is preferably of such width that it conveniently fits between the back It) and the blade 24 of the saw. Basket- like lobes 32 and 34 extend outwardly from the central portion of the disk and preferably are outwardly and backwardly flared so that they form an enclosing portion for the knuckles of the hand engaging the handle 26.

An attaching plate 40 is secured to th central portion 30 of the disk by means of suitable fasteners such as screws 42. The plate 49 is provided adjacent one end thereof with an upturned locking rim 44 which is adapted to contact one side of the handle member 28. An ear 4B is provided on the upper portion of the plate 40 and an ear 48 is provided on the lower end of the plate 40. The ear 46 is provided with an aperture 55 while the ear 48 is provided with an aperture 52. A pin 54 mounted in the apertures 50 and 52 and since the apertures 50 and 52 are offset with respect to each other, the pin 54 is mounted in diagonal relation with respect to the rim 44. A dog 56 is slidably mounted on the pin 54 and has a diagonal aperture 58, so that the aperture 58 slides along the pin 54 the face 6!} of the dog 56 will be substantially parallel to the rim 44. A resilient element such as a spring 62 constantly urges the dog 55 upwardly along the pin 54 so that the side will be constantly urged into proximity with the upstanding rim 44. A thumb engaging wing 64 is provided on the dog 56 so that the dog 55 may be easily pushed downward on the pin 54 against the tension of the element 62.

In the utilization of the guard according to the invention the central portion 3!} is applied between the back I2 and the blade 24 of the saw and the dog 56 depressed to open the aperture between the face 63 and the upstanding rim 44. The rim 44 is then brought into engagement with the handle of the saw and the dog 56 released so that the handle of the saw is gripped between the face 68 of the dog and the inner face of the upturned rim 44. The D- shaped lobes 32 and 34 will then extend outwardly and rearwardly so as to protect the hand of the user of the saw in the event the saw blades break or if the saw should come in contact with any portion of the work.

A preferred embodiment of the invention has been shown and described according to the best present understanding thereof.

It will be obvious to those skilled in the art that changes and modifications can be made therein without departing from the true spirit of the invention.

Having described the claimed as new is:

1. A knuckle guard for an open frame saw comprising a guard disk, said disk being cut away to provide a central portion fitting between the back and the blade of the saw, a connector plate secured on the back of said disk, a lock rim on said plate, a diagonally mounted guide pin disposed on said plate, said pin converging toward said rim, a dog slidable on said pin, resilient means urging said dog along said pin to approach said rim.

2. A knuckle guard for an open frame saw comprising a guard disk, said disk being cut away to provide a central portion fitting between the back and the blade of the saw, a connector plate secured on the back of said disk, a lock rim on said plate, a diagonally mounted guide pin disposed on said plate, said pin converging toward invention, what is said rim, 9. dog slidable on said pin, resilient means urging said dog along said pin to approach said rim, said disk being dished to provide a partial inclosure for the handle behind said disk.

3. A guard for attachment to a hack saw or the like comprising a central portion fitting between the back and blade of saw, dished lobes flaring outwardly and rearwardly from said central portion, a connector plate secured to the rear side of said guard, an upstanding rim on said plate adjacent said central portion, ears at the top and bottom of said plate, a guide pin mounted in said ears, said pin being arranged in converging rela- References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,078,821 Biggs Nov. 18, 1913

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