Abstract: A tensioning mechanism for a hack saw blade extends through a pin holder mounting slot of a hack saw frame and applies tension to a hack saw blade attached thereto. The tensioning mechanism includes a first portion having a configuration that, with respect to a configuration of the slot, permits rotation of the tensioning mechanism when the first portion extends through the mounting slot. The tensioning mechanism also includes a second portion having a configuration that, with respect to the configuration of the slot, engages into the slot only in select rotational orientations thereof relative to the slot, wherein one of said orientations is angularly separated from another orientation by a substantially set rotational angle of the second portion. The tensioning mechanism further includes first and second mechanisms configured to prevent removal of the tensioning mechanism from the mounting slot once extended therethrough.

Abstract: A blade adapter for a hacksaw is connected to the spine of the hacksaw and includes three connection portions. The hacksaw blade is connected between the engaging portion connected to the handle of the hacksaw and one of the three connection portions of the blade adapter to set the hacksaw blade at two different angular positions relative to the spine. The hacksaw blade can be set to be parallel to the spine or at an angle relative to the spine. A jabsaw blade is able to be connected to the front end of the hacksaw.

Abstract: A saw is described as having an adjustable handle wherein the angle of the handle in relation to the longitudinal axis of the saw blade and blade holder is rotatably adjustable.

Abstract: It comprises a U-shaped bow (1), a handle (2) and two securing devices (3, 4) at both ends of the saw (5), each of the devices (3, 4) comprising a body (31) fitted with a longitudinal passage (32) enabling the control and centering of the saw (5), the body (31) comprising a tightening screw (33, 34) fitted perpendicularly to the passage (32) enabling the possibility of tightening the corresponding end of the afore-mentioned saw (5) in the passage (32).

Abstract: The invention provides an improved frame for a hacksaw blade. The frame has a handle member and a frame member coupled together and defining a pair of aligned star shaped openings. Blade attaching components are releasably engaged in the respective openings for carrying a hacksaw blade. In the preferred embodiment the attaching components can be engaged in any one of eight angular positions, and the attaching components preferably includes curved portions to offset a hacksaw blade from the star shaped openings whereby the hacksaw can be used to cut through an item down to a supporting surface and also, with some adjustment to flush out an item projecting from a surface.

Abstract: A saw blade adjusting mechanism, which includes a first tightening up rod and a second tightening up rod fastened to the frame assembly of a hack saw at two opposite ends by nuts to hold the saw blade, a rotary adjusting knob mounted around the first tightening up rod and forced by a first spring to mesh with a toothed through hole on the front end of the frame assembly of the hack saw, a gear mounted around the second tightening up rod and forced by a second spring to disengage from the locating block, wherein the first and second tightening up rods are moved synchronously when the rotary adjusting knob is turned to change the angular position of the saw blade.

Abstract: Disclosed is a saw blade adjusting device including an adjusting link fastened to a handle to hold either end of a saw blade, a toothed locating block fastened to a front block of the handle, a gear mounted on a rectangular block on the adjusting link and releasably meshed with the toothed locating block, and a spring mounted on the adjusting link and stopped between the gear and the handle, wherein the gear can be moved backwards along the adjusting link to disengage from the toothed locating block, then rotated in either direction to turn the saw blade through 360.degree. angle via the adjusting link, and then moved back to its former position in mesh with the toothed locating block to hold the adjusting link in keeping the saw blade at the adjusted angular position.