GB2084922A - Hacksaw - Google Patents

Abstract

Sleeves provided on the free ends of frame of the hacksaw have the ends of the blade connected thereto by L-shaped bolts bent to have slotted lateral limbs, through which the respective ends of the blade extend. The sleeves are held in place by friction, but can rotate on the limbs under sawing stresses to allow flexibility in the saw to compensate for misalignment of the saw blade with a cut being produced thereby, so as to avoid jamming. <IMAGE>

Description

SPECIFICATION Hacksaw This invention concerns hacksaws.

In some cutting operations, the blade of a hacksaw will jam in the slot it is cutting in a workpjece. In many instances, this jamming occurs as a result of the user deflecting the saw as cutting progresses so that the path of movement of the blade is not exactly true to the direction of the already-cut slot. An object of this invention is to provide an improved saw construction wherein this disadvantage is obviated.

With this object in view, the present invention provides a hacksaw comprising a frame providing a spaced-apart pair of limbs between free ends of which extends a blade of the saw, characterised in that each said limb has a respective sleeve rotatably mounted on its free end and the blade is mounted on the frame by being connected by its ends to said sleeves which provide for flexibility of the blade to align itself during sawing with its previously-produced saw cut.

Each said sleeve preferably protrudes beyond the extremity of the free end of the respective limb, and a respective bolt, to which the corresponding end of the blade is secured, conveniently extends through the protruding portion of said sleeve.

Each said bolt is preferably bent to provide a slotted lateral limb through which the respective blade end extends and to which said blade end is fixed.

In a preferred embodiment of the hacksaw of the invention, the frame is of inverted-U configuration, being conveniently of tubular metal and the limbs thereof preferably diverge slightly outwardly towards their free ends.

In order that the invention may be fully understood, it will be described further, by way of example, with reference to the accompanying drawing in which the single figure is a side elevation illustrating a preferred embodiment of the hacksaw of the invention.

As shown in the drawing, the preferred embodiment of the hacksaw of the invention comprises a frame 10. This is made of metal tubing and is generally of inverted-U configuration, providing two limbs 11 and 12 which are symmetrically disposed and diverge from one another very slightly towards their free ends. Each said limb 11, 12 has fitted thereon, in spigot and socket fashion, a respective sleeve 13, 14, these sleeves being rotatable on their respective limbs 11, 12 and each protruding by a short distance beyond the extremity of the free end of the respective limb 11, 12.

Each said sleeve 13, 14 has a respective hole diametrically therethrough, this accommodating the threaded shank 15 of a respective bolt 16 which is approximately L-shaped in configuration, providing a lateral arm 17 which is slotted to enable the respective end of a conventional hacksaw blade 18 to extend therethrough as shown. A respective ring 19 is provided through each end of the blade 18 and butterfly nuts 20 on the shanks 15 enable the bolts 16 to be drawn apart in the frame 10 to hold the blade 18 firmly under tension with the lateral arms 17 abutting against the rings 19.

With the nuts 20 tightened on their bolts 16 to tension the blade 18, the sleeves 13, 14 are deflected slightly on their limbs 11, 12 and are retained on the latter by friction.

However, the arrangement is nevertheless, such that, when the saw is used, the sleeves 13, 14 can rotate on their respective limbs 11, 12 to the extent appropriate to enable the blade 18 to deflect to compensate for any misalignment with the slot being sawn and thereby avoid jamming.

The invention is not confined to the precise details of the foregoing example and variations may be made thereto. Thus, for instance the shape of the frame may differ from what is shown, as also may the manner in which the ends of the saw blade are screwed to their respective sleeves.

1. A hacksaw comprising a frame providing a spaced-apart pair of limbs between free ends of which extends a blade of the saw, characterized in that each said limb has a respective sleeve rotatably mounted on its said free end and the blade is mounted on the frame by being connected by its ends to said sleeves which permit the blade to provide for flexibility of the blade to align itself during sawing with its previously-produced saw cut.

2. A hacksaw as claimed in claim 1 wherein each sleeve protrudes beyond the extremity of the free end of the respective limb, and a respective bolt to which the corresponding end of the blade is secured, extends through the protruding portion of said sleeve.

3. A hacksaw as claimed in claim 2 wherein each said bolt is bent to provide a slotted lateral limb through which the respective blade end extends, and to which said blade end is fixed.

4. A hacksaw as claimed in claim 1, 2 or 3 wherein the frame is of inverted-U configuration.

5. A hacksaw as claimed in claim 4 wherein the frame is of tubular metal.

6. A hacksaw as claimed in any preceding claim wherein the pair of limbs of the frame diverge slightly towards their free ends.

7. A hacksaw substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Hacksaw This invention concerns hacksaws. In some cutting operations, the blade of a hacksaw will jam in the slot it is cutting in a workpjece. In many instances, this jamming occurs as a result of the user deflecting the saw as cutting progresses so that the path of movement of the blade is not exactly true to the direction of the already-cut slot. An object of this invention is to provide an improved saw construction wherein this disadvantage is obviated. With this object in view, the present invention provides a hacksaw comprising a frame providing a spaced-apart pair of limbs between free ends of which extends a blade of the saw, characterised in that each said limb has a respective sleeve rotatably mounted on its free end and the blade is mounted on the frame by being connected by its ends to said sleeves which provide for flexibility of the blade to align itself during sawing with its previously-produced saw cut. Each said sleeve preferably protrudes beyond the extremity of the free end of the respective limb, and a respective bolt, to which the corresponding end of the blade is secured, conveniently extends through the protruding portion of said sleeve. Each said bolt is preferably bent to provide a slotted lateral limb through which the respective blade end extends and to which said blade end is fixed. In a preferred embodiment of the hacksaw of the invention, the frame is of inverted-U configuration, being conveniently of tubular metal and the limbs thereof preferably diverge slightly outwardly towards their free ends. In order that the invention may be fully understood, it will be described further, by way of example, with reference to the accompanying drawing in which the single figure is a side elevation illustrating a preferred embodiment of the hacksaw of the invention. As shown in the drawing, the preferred embodiment of the hacksaw of the invention comprises a frame 10. This is made of metal tubing and is generally of inverted-U configuration, providing two limbs 11 and 12 which are symmetrically disposed and diverge from one another very slightly towards their free ends. Each said limb 11, 12 has fitted thereon, in spigot and socket fashion, a respective sleeve 13, 14, these sleeves being rotatable on their respective limbs 11, 12 and each protruding by a short distance beyond the extremity of the free end of the respective limb 11, 12. Each said sleeve 13, 14 has a respective hole diametrically therethrough, this accommodating the threaded shank 15 of a respective bolt 16 which is approximately L-shaped in configuration, providing a lateral arm 17 which is slotted to enable the respective end of a conventional hacksaw blade 18 to extend therethrough as shown. A respective ring 19 is provided through each end of the blade 18 and butterfly nuts 20 on the shanks 15 enable the bolts 16 to be drawn apart in the frame 10 to hold the blade 18 firmly under tension with the lateral arms 17 abutting against the rings 19. With the nuts 20 tightened on their bolts 16 to tension the blade 18, the sleeves 13, 14 are deflected slightly on their limbs 11, 12 and are retained on the latter by friction. However, the arrangement is nevertheless, such that, when the saw is used, the sleeves 13, 14 can rotate on their respective limbs 11, 12 to the extent appropriate to enable the blade 18 to deflect to compensate for any misalignment with the slot being sawn and thereby avoid jamming. The invention is not confined to the precise details of the foregoing example and variations may be made thereto. Thus, for instance the shape of the frame may differ from what is shown, as also may the manner in which the ends of the saw blade are screwed to their respective sleeves. CLAIMS

1. A hacksaw comprising a frame providing a spaced-apart pair of limbs between free ends of which extends a blade of the saw, characterized in that each said limb has a respective sleeve rotatably mounted on its said free end and the blade is mounted on the frame by being connected by its ends to said sleeves which permit the blade to provide for flexibility of the blade to align itself during sawing with its previously-produced saw cut.

2. A hacksaw as claimed in claim 1 wherein each sleeve protrudes beyond the extremity of the free end of the respective limb, and a respective bolt to which the corresponding end of the blade is secured, extends through the protruding portion of said sleeve.

3. A hacksaw as claimed in claim 2 wherein each said bolt is bent to provide a slotted lateral limb through which the respective blade end extends, and to which said blade end is fixed.

4. A hacksaw as claimed in claim 1, 2 or 3 wherein the frame is of inverted-U configuration.

5. A hacksaw as claimed in claim 4 wherein the frame is of tubular metal.

6. A hacksaw as claimed in any preceding claim wherein the pair of limbs of the frame diverge slightly towards their free ends.

7. A hacksaw substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.