Hacksaw frame

Claim 2

Hacksaw frame for a blade comprising a handle having upper and lower portions, the lower portion having a socket extending therethrough from front to rear, which socket is of non-circular cross section adjacent its forward end, a frame arm rigidly mounted at one end in the upper portion of the handle and extending forwardly thereof, the other end of the frame arm having a connector for connection to one end of the hacksaw blade, a blade connector block mounted in the socket solely for axial movement therein, the block having a longitudinal threaded orifice opening rearwardly thereof and having a connector for connection thereto of the other end of the hacksaw blade, a takeup pin having a threaded forward end threaded into the orifice in the connector block, the take-up pin extending rearwardly in the socket and terminating adjacent the rearward end thereof, a crank pivotally attached to the rearward end of the take-up pin to rotate about the pivotal attachment in a plane substantially normal to the socket axis and to the rear of the handle to cause the pin to rotate about its axis, said crank being configured to fit closely against the rearward surface of the handle, and means preventing axial movement of the take-up pin, whereby, as the crank is rotated, the take-up pin is threaded into the connector block, drawing the latter rearwardly in the socket and tightening the blade in the hacksaw frame.

Claim 3

The hacksaw frame of claim 1 wherein said crank has a graspable projection thereon spaced from its pivotal connection to the take-up pin to facilitate manual cranking thereof, and wherein the handle has a rear surface with an orifice therein adapted to receive the graspable projection of the crank, the orifice having a spring-loaded detent knob projecting inwardly from its periphery to releasably retain the graspable projection in the orifice.

Claim 4

The hacksaw frame of claim 1 wherein said socket has internal, rearwardly-facing surfaces at a point along its axis and wherein the take-up pin has a flange rotatably mounted thereon but prevented from rearward axial movement with respect to the take-up pin, the flange contacting the rearwardly facing surfaces of the socket to thereby prevent forward axial movement of the take-up pin.

Claim 5

The hacksaw frame of claim 3 including a retainer rigidly mounted on the take-up pin rearwardly of said flange to prevent rearward movement of the flange on the take-up pin.

Claim 6

The hacksaw frame of claim 3 wherein said take-up pin has a circumferential groove therein at a point along its axis, and wherein said handle has a removable dowel mounted therein transversly of the socket and passing through the circumferential groove, whereby forward and rearward axial movement of the take-up pin is restrained.

Claim 7

The hacksaw frame of claim 5 wherein the socket has a rearwardly facing, upwardly extending shelf internally thereof and a projection rising internally from its lower surface forwardly of, and in contact with, said transverse dowel, whereby the flange rotatably mounted upon the take-up pin bears upon the upwardly extending shelf and against the transverse dowel to restrain forward axial movement of the take-up pin.

Claim 8

A hacksaw frame for a blade comprising: a handle having upper and lower portions, the lower portion having a non-circular socket extending therethrough axially from front to rear, the socket having a rearwardly facing, upwardly extending ledge therein, the handle having an orifice therein opening rearwardly thereof intermediate its height; a frame arm, one end of which is mounted in the upper portion of the handle and extends forwardly thereof, and the other end of which is adapted to connect to one end of the hacksaw blade; a blade connector block mounted slidably but not rotatably in the socket and removable forwardly therefrom, the connector block having a connecting member thereon for attachment of a hacksaw blade thereto, and having a threaded orifice opening rearwardly thereof; a take-up pin, one end of which threadingly engages the orifice in the blade connector block, and the other end of which extends rearwardly in the socket, the take-up pin having a circumferential groove therein intermediate its length and having a retaining clip rigidly mounted thereon rearwardly of the circumferential groove; a crank pivotally attached at one end to the rearward end of the take-up pin and adapted to be cranked in a plane substantially normal to the socket axis rearwardly of the handle, the crank having a graspable projection extending from its other end adapted to enter the orifice in the handle and to be releasably retained therein; a dowel extending transversly of the socket adjacent the bottom surface of the socket and in substantial alignment with the upwardly extending, rearwardly facing ledge therein, the dowel engaging the circumferential groove in the take-up pin to restrain axial movement thereof in the socket; a bearing plate rotatably mounted on the take-up pin rearwardly of the circumferential groove therein but forwardly of the retaining clip thereon, the bearing plate contacting the transverse dowel and upwardly extending ledge in the socket to prevent forward movement of the take-up pin in the socket; whereby, as the crank is cranked, the take-up pin is threaded into the connector block, drawing the latter rearwardly in the socket and tightening the blade in the hacksaw frame, and whereby the crank may be brought to rest against the rearward surface of the handle, the projection on the crank being releasably retained in the orifice in the handle.

Claim 9

A hacksaw frame for a blade comprising: a handle having upper and lower portions, the lower portion having a non-circular socket extending therethrough axially from front to rear, the socket having a rearwardly facing, upwardly extending ledge therein, the handle having an orifice therein opening rearwardly thereof intermediate its height; a frame arm, one end of which is mounted in the upper portion of the handle and extends forwardly thereof, and the other end of which is adapted to connect to one end of the hacksaw blade; a blade connector block mounted slidably but not rotatably in the socket and removable forwardly therefrom, the connector block having a connecting member thereon for attachment of a hacksaw blade thereto, and having a threaded orifice opening rearwardly thereof; a take-up pin, one end of which threadingly engages the orifice in the blade connector block, and the other end of which extends rearwardly in the socket, the take-up pin having a circumferential groove therein intermediate its length and having a retaining clip rigidly mounted thereon rearwardly of the circumferential groove; a crank pivotally attached at one end to the rearward end of the take-up pin and adapted to be cranked in a plane substantially normal to the socket axis rearwardly of the handle, the crank having a graspable projection extending from its other end adapted to enter the orifice in the handle and to be releasably retained therein; a dowel extending transversly of the socket adjacent the bottom surface of the socket and in substantial alignment with the upwardly extending, rearwardly facing ledge therein, the dowel engaging the circumferential groove in the take-up pin to restrain axial movement thereof in the socket; a bearing plate rotatably mounted on the take-up pin rearwardly of the circumferential groove therein but forwardly of the retaining clip thereon, the bearing plate contacting the transverse dowel and upwardly extending ledge in the socket to prevent forward movement of the take-up pin in the socket; whereby, as the crank is cranked, the take-up pin is threaded into the connector block, drawing the latter rearwardly in the socket and tightening the blade in the hacksaw frame, and whereby the crank may be brought to rest against the rearward surface of the handle, the projection on the crank being releasably retained in the orifice in the handle.

Claim 10

The hacksaw frame of claim 7 wherein the socket has a bottom surface having a projection arising therefrom and positioned fowardly of, and in supportive contact with, the transverse dowel.