Abstract: An improved blade tensioning mechanism carried by a hacksaw handle is disclosed. It consists of a longitudinally extending frame member with a handle attached at one end and a pivoting lever attached at the end opposite the handle. A blade anchoring pin, or pins, are located on the pivoting lever and on the handle allowing the attachment of a blade. The pivoting lever has attached to it an extension bar that substantially runs the length of the longitudinal frame member and, when turned in a clockwise direction, is captured at the handle end with a spring loaded lock located at the top of the handle portion of the frame. Fine adjustments to the amount of tension are accomplished by the adjustment of a screw which effectively lengthens the longitudinal member with relation to the blade anchoring pins, raising or lowering the amount of tension accordingly. The screw is tightened with the tension released from the blade.

Abstract: A hack-saw that consists of a powered motor encased in a housing unit with a handle for gripping by the operator. Extending out from the top of the handle is an elongated bar which runs out forward from the motor housing unit to which depends a leg parallelly disposed relative to the motor housing. Extending out from the bottom of this leg is a rod, spring and nut assembly parallel in line to the elongated bar. One end of the metal hack-saw blade is removably attached to the rod, spring and bolt assembly and the other end of the blade is removably attached to the reciprocating output member of the motor extending out from the bottom of the motor housing which when running moves back and forth, causing a sawing motion. In another embodiment the rod, spring and nut assembly includes an anti-rotational structure to assure the hack-saw blade reciprocates over a constant path of travel to avoid misalignment.

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: A hack saw attachment for converting a power driven saber saw or other reciprocable tool to a power driven hack saw includes a plate having a hack saw frame fixed perpendicular thereto. The sole plate of a saber saw is provided with openings for releasable connectors whereby the plate of the attachment is easily connected to the saber saw sole plate. The hack saw frame carries guides at its inner and outer ends, the inner end of the blade passes through the inner guide for attachment to the saber saw arbor. The outer guide carries a second arbor for the outer end of the blade and a spring acts on the outer arbor to ensure proper tension of the hack saw blade during cutting. The hack saw frame carries a handle to facilitate manual reciprocation of the hack saw as it is also reciprocated by the saber saw drive to ensure even wear of the hack saw teeth along the length of the blade.

Abstract: This device consists of an encased, electrically powered motor housing unit with a first handle parallel in line to the height of the unit. Extending out from the top of the handle is a metal bar one inch in diameter which runs out forward from the motor housing unit to which is attached a second handle bar parallel in line to the first handle and the motor housing. Extending out from the bottom of this second handle is a metal rod with a spring and a bolt parallel in line to the metal bar. This metal rod has a hole in it for mounting one end of a metal hack-saw blade. The other end of the blade is to be mounted to a metal piece extending out from the bottom of the motor housing which when running moves back and forth, causing a sawing motion. Directly above the metal rod with a spring and directly above the metal piece is a metal bar to which is attached a roller to keep the hack-saw blade steady.

Abstract: A bladed implement such as a knife, has a flexible blade extending from a handle. The blade can be rigidified for use by a series of slides which run along a slot in the blade and which can be forced into and held in end to end contact by an operating mechanism in the handle. The endmost slide engages a stop at the distal end of the slot. When the operating mechanism is released, the slides are free to separate and the flexibility of the blade is restored.

Abstract: A hand held saw for use with hacksaw blades with a low profile frame including a reduced height support post and cross support member attached to the post a short distance from the blade. A screwdriver-type handle is attached at a right angle to the post to permit a horizontal hand grip. A simplified blade fastener extends longitudinally through the post to attach the blade to the handle, the body of the fastener being aligned with the length of the blade and axis of the handle.

Abstract: A cordless, electric handsaw. A U-shaped frame is removably mounted to the saw main frame to support the outer end of a coping saw blade having an inner end removably mounted to a reciprocably driven linkage connected to a battery operated motor contained in the handle. A keyhole saw blade is mountable to the reciprocably driven cylinder once the coping saw blade is removed.

Abstract: A file holder 10 allows a blade 12 to be attached to a base 20, such as by grub screws. At one end of the base 20 there is a handle 16 rotatably mounted on the base 20 and incorporating a cam surface. A tension bar 18 extends between the handle 16 and the other end of the base 20. The tension bar 18 incorporates a cam follower which bears on the cam surface in the handle 16 so that as the handle 16 is rotated, the separation of the two points is cuased to vary, so that base 20 and the blade 12 flex to a degree which depends on the position of the handle 16 in relation to the base 20.

Abstract: A hacksaw frame having a blade holder having opposed blade clamping surfaces and means for locking the surfaces in clamping relationship loosely mounted on the frame for holding a hacksaw blade, and tensioning means on the frame for holding a blade under tension.

Abstract: A hand guard for a hacksaw has main portions extending outwardly and rearwardly from a rear post of the hacksaw frame and top and bottom portions smoothly connecting upper and lower regions of the main portions with upper and lower regions of the rear post. The guard forms a cup-like receptacle for the fingers and knuckles of the hand of the user to protect them from contact with foreign objects. The top portions of the guard have depressions therein for receiving the thumb of the user in a comfortable extended position.