Abstract: A collapsing blade comprising an upper and lower handle section joined at the rear by pivotal means; a set of arms pivoted upon the lower handle section, a rear blade pivoted on the upper handle section by means of an embracing body; a front blade comprising a hollow portion and an edged portion pivotally attached to said arms and rear blade; wherein by angular rotation of handle sections the blade assembly is arranged from collapsed to extended configurations.

Abstract: A hand tool includes a handle and a holding member is connected to the front end of the handle. A first part is connected to one end of the holding member and is connected to a second part connected to the front end of the handle. The first part has a first recess defined transversely therethrough. A second recess and a third recess are respectively in one side of the first part and communicate with the first recess. The second recess is located between the first and third recesses. A control unit has two pins which are movably cooperated with the first, second and the third recesses. The second pin is connected to the first pin. When pushing the first pin toward the second pin, the first part is shifted from the second part so that a blade is inserted into or removed from the first and second parts.

Abstract: A hack saw comprises a proximal end, a proximal handle located at the proximal end, and a distal end spaced from the proximal handle for mounting a hack saw blade therebetween. The handle includes a proximal cavity at a base end thereof, dimensioned to allow a portion of a proximal pin holder therethrough, and a proximal pin holder retaining member within the proximal handle proximally spaced from the proximal cavity, defining a slot therebetween for retention of a pin holder therein. The pin holder retaining member is positioned to form an interference with the proximal pin holder when the pin holder is located in the handle and prevents the proximal pin holder from dislodging or being removed therefrom.

Abstract: A hacksaw including a removable blade has a handle including a recess configured to receive the blade and a frame including a first end and a second end. The first end of the frame is coupled to the handle and the second end extends away from the handle. The hacksaw also includes a blade retention mechanism coupled to the second end of the frame for coupling the blade to the second end of the frame. The blade retention mechanism includes an adjustable fastener coupled to the frame and coupling the blade retention mechanism to the frame, a resilient member seated on the fastener, a retaining member seated on the fastener, the retaining member spaced apart from the frame by a gap and the gap having a width, and a lever coupled to the fastener and movable between a first position and a second position.

Abstract: A hand saw that includes a frame, a lever, and a rod movable in a first direction to increase a distance between a first blade support and a second blade support and the rod is movable in a second direction to decrease the distance between the first blade support and the second blade support. The rod is coupled to the lever and the frame such that the rod is movable in the first direction and with the lever when the lever moves from a release position toward a tension position in order to tension the blade. The rod is coupled to the lever and the frame such that the rod is movable with respect to the frame in the first direction and the second direction and movable in the first direction and the second direction independent of the lever when the lever is in the release position.

Abstract: A hand-saw-blade having a first edge provided with saw teeth and a plurality of elongated apertures spaced apart in a direction of the first edge is disclosed. A direction of elongation of the elongated apertures is oriented including an angle of between 15° and 65° and especially between 20° and 55° and further especially between 25° and 45° relative to the first edge. Furthermore, a hand-saw having this hand-saw-blade and a handle or bow-shaped metal-frame is disclosed, wherein the handle is mounted at one edge of the hand-saw-blade other than the first edge respectively ends of the bow-shaped metal-frame are attached to opposing edges of the hand-saw-blade different from the first edge.

Abstract: A hand-held saw with a rigid saw frame is disclosed. The rigid frame of the hand-held saw allows a saw blade to remain highly tensioned during the cutting process. The rigid saw frame has a “C-shape,” is unbent, and contains openings that make up a truss-like structure, which distributes an external force that is focused on one portion of the saw frame across other portions of the saw frame.

Abstract: An accessory tool is configured to be coupled to a power tool having a tool drive structure. The accessory tool includes a spring component and has a first arm and a second arm attached to the spring component. The first arm includes (i) a first proximal end portion defining a first accessory drive structure that is configured to mate with a first portion of the tool drive structure, and (ii) a first distal end portion having a first holding structure. The second arm is spaced apart from the first arm and includes (i) a second proximal end portion defining a second accessory drive structure that is configured to mate with a second portion of the tool drive structure, and (ii) a second distal end portion having a second holding structure.

Abstract: A handsaw for holding a saw blade for cutting is disclosed to include a handle having an cantilever bar, an extension bar pivoted to the cantilever bar and turnable relative to the handle between a received position and an extended position, a blade-retaining arm pivoted to one end of the extension bar remote from the handle and turnable about the axis of the extension bar, and two blade retaining members respectively provided at the handle and the blade-retaining arm for the mounting of a saw blade when the extension bar is turned to the extended position.

Abstract: A hacksaw having a frame that includes a back handle and an elongated beam that has a series of ridges on at least one or more surfaces of the elongated beam that form a file for reducing and smoothing surfaces of an article. The elongated beam has a first distal end coupled with a first back handle section. A hacksaw blade is coupled with the back handle and a fore piece coupled to a second distal end of the elongated beam.

Abstract: A hack saw having a blade holding assembly and a blade lock assembly. The blade lock assembly having moveable blade lock means adapted to receive a blade therebetween, mechanism for moving the blade lock means to a position to hold a blade in place.

Abstract: A hand-held dressing device has a blade with a sharpened cutting edge. The blade is preferably V- or U-shaped and permanently or removably supported by the limbs of a Y-shaped body with an extending hand group. The blade may be made from a single piece or form multiple segments with straight or curved cutting edges. The blade of blade segments may be fixed, such as by an adhesive, to a supporting carrier. Guard projections may extend from behind the cutting edge to beyond the cutting edge to reduce the likelihood of inadvertent contact with the blade edge while maintaining effective cutting action. In a method of use, the hair dressing device is manipulated so that the blade partly surrounds a cluster of hair strands and the device is moved to cut at least some of the strands of hair.

Abstract: A structure of a miniature hacksaw includes a handle, a bow frame connected with the fore end of the handle. The bow frame has a longitudinal slit and the handle has a limited space including an opening in outer side, a plurality of ribs on inner side, a first and second pivot holes respectively in an upper and a lower wall and a through hole in the front of the limited space. A radial fixture is engageable into the limited space and having an axial hole engaged with the pivot holes and rotatably secured by a rivet. It is characterized in that turns in the radial fixture into the limited space, its protruded stopping surface in cooperation with the ribs will clamp the saw blade very tight without loosening.

Abstract: A blade quick removal device includes an arcuate frame integrated with a front handle and a rear handle, a first hook bar under the front handle, an oscillatory second hook bar nearby the rear handle for adjustably retaining the saw blade thereon and a locking member pivoted to the lower end of the second hook bar for fastening the hook bar to a reduced bottom of the rear handle and having an axial rod and a pair of latches respectively held by a hook and a pair of retaining projections on the bottom of the rear handle.

Abstract: A resilient hand guard for protecting the hand of a hacksaw user including a flat shield formed of resilient non-metallic or elastomeric material having a height equal to that of the frame and a width at least as great as a projected frontal width of a user's hand when grasped around the handle. The shield has an elongated notch extending downwardly from an upper margin having a width and length sufficient to be fitted around and receive support from an upper portion of the frame just forwardly of the handle. The shield also has a mounting aperture positioned directly below the notch sized to fit over and receive support from a threaded end of an elongated rear blade tensioning support of the frame. The shield has sufficient resiliency for a side portion thereof to be protectively deflected around the hand upon inadvertent impact against an object during use of the hacksaw.

Abstract: The invention provides a frame (12) of a hack-saw (10) and, particularly, the handle formation (14), defines shoulder formations (22) that define a linear edge (24) on opposite sides of the extension formation (16), the operative external edge (26) of the extension formation (16) extending perpendicularly with respect of the shoulder formations (22). As such, the frame (12) of the hack-saw (10) can be used as a conventional L-square.

Abstract: A saw and/or saw frame including: an elongate substantially rigid back member and a swing arm pivotally connected to the back member so as to be rotatable between an extended position and a storage position; a handle with a first blade mount; the swing arm includes a second blade mount; the back includes a third blade mount disposed proximate to the swing arm; each of the first, second, and third blade mounts being constructed to engage one end of a removably mounted saw blade, with the first, second, and third blade mounts disposed to allow quick changes in blade configuration. The back member also has an elongate blade storage cavity accessible from above adapted to store at least one of the removably mounted saw blades and an auxiliary blade mounting mechanism configured to operatively mount an auxiliary blade extending forward from the frame.

Abstract: Provided is a method for repairing an aperture in a panel in which, a) a plug is inserted in a such aperture to fill same and project above the surface of the panel, b) the plug is adhered in the aperture and c) the plug is flush cut with such surface to repair the panel. Also provided is a tool for flush cutting such projection wherein a blade is mounted across a frame, which blade is mounted at about 90 degrees to the plane of such frame so as to be parallel with the surface of the panel when the frame is mounted upright thereon, to provide clearance for the hand that guides the frame while flush cutting the projection from the panel. Desirably the ends of the saw blade are recessed between smooth feet of the frame so that the blade is elevated slightly above the panel surface, to reduce or avoid scratching thereof during the flush cutting step.

Abstract: A hacksaw includes an elongated blade, a frame, and a blade tension adjustment mechanism. The blade tension adjustment mechanism includes a lever constructed and arranged to be pivotally moved between (1) a blade tensioning position so as to tension the blade, and (2) a blade releasing position so as to release the tension from the blade and thereby allow removal and replacement of the blade. A lock is slidably attached to the lever to slide between (1) a locked position wherein the lock secures the lever in the blade tensioning position, and (2) an unlocked position wherein the lock permits the lever to be pivoted between the blade tensioning position and the blade releasing position.

Abstract: An elongate, cylindrical hand-held powered coping saw adapted for making thin cuts of short length, such as for cutting individual dies from a full arch dental model generally includes a blade assembly, a housing, a rotary motor having a drive shaft, a piston for driving the blade assembly, and a motion converter connecting the drive shaft to the piston for converting rotary motion of the drive shaft into reciprocating linear motion of the piston. Preferably, the blade stroke length is less than the distance between opposing U-sections of a full dental arch model along a cut line.

Abstract: A folding hacksaw having the back of the saw and the saw handle pivotally joined together and pivotally connected to a four-bar linkage comprising the blade, side frames and a back frame. The back frame is enclosed within the back of the saw. Movement of the handle relative to the back of the saw causes the saw blade to extend from the back or retract into the back in the manner of a folding knife. The movement of the handle places the handle in the proper cutting position when the blade is extended. A top latch maintains the handle in line with the back in the retracted position. A blade latch maintains the saw blade and the handle rigidly in the blade extended position.

Abstract: An improved structure of a hand-saw having adjustable sawing blade includes two holding sections, a front and a rear holding section, a sawing blade, a front-mounted ratchet teeth fine tuning block having one end with four teeth ratchet, the other end thereof being a semicircular and having a protruded cylindrical bar for the insertion of the sawing blade, a ratchet teeth adjusting sleeve being cylindrical shape having one end with inner edge being ratchet teeth shape, and the other end thereof being a larger internal radius, a rear-mounted ratchet wheel fine tuning block having an external edge with four ratchet teeth for engagement with the ratchet-teeth adjusting sleeve for the insertion of the other end of the sawing blade, a hexagonal pull-push engaging connector module having a circular shape center and a cavity adaptable to a hexagonal shape screw nut, a loosening button located at the root section of the rear holding section being an arch-shaped body and having a gripping section provided with a reces

Abstract: An improved structure of a hand-saw having adjustable sawing blade includes two holding sections, a front and a rear holding section, a sawing blade, a front-mounted ratchet teeth fine tuning block having one end with four teeth ratchet, the other end there of being a semicircular and having a protruded cylindrical bar for the insertion of the sawing blade, a ratchet teeth adjusting sleeve being cylindrical shape having one end with inner edge being ratchet teeth shape, and the other end thereof being a larger internal radius, a rear-mounted ratchet wheel fine tuning block having an external edge with four ratchet teeth for engagement with the ratchet-teeth adjusting sleeve for the insertion of the other end of the sawing blade, a hexagonal pull-push engaging connector module having a circular shape center and a cavity adaptable to a hexagonal shape screw nut, a loosening button located at the root section of the rear holding section being an arch-shaped body and having a gripping section provided with a rece

Abstract: A hacksaw includes a U-shaped frame and a handle connected to a first end of the frame and an engaging port is connected to a second end of the frame. A groove is defined longitudinally in the handle and a passage is defined in the handle. The passage intersects the groove and communicates with the groove. A retaining member is movably received in the passage and a recess defined in the retaining member so that a blade extends through the groove and the recess. The blade is engaged with the engaging port. A cam member is pivotably connected an end of the retaining member such that the retaining member is lifted to secure the blade between an inside of the recess and the inside of the groove by pivoting the cam member. The blade is easily loosened by pivoting the cam member in the other direction.

Abstract: A hand saw is provided with a support having a front lever, which is pivotable about one of the opposite ends of the support between a rest position, in which it extends coplanar with the support, to an operative position, and a handle mounted on the other end of the support and rotatable thereabout from and in a respective rest position, in which the handle extends coplanar to the support, so as to the hand saw has substantially a linear configuration when the front lever and the handle are displaced in their rest positions.

Abstract: A hacksaw weight having a pair of axially aligned saw engagement members adjustably secured to one another by an extending threaded support shaft. A threaded engagement-retaining fitting can be selectively positioned on the threaded support shaft with a retaining disk and registration pin positioned thereon for engagement with aligned notches in the respective engagement members. The weight can be selectively secured in multiple positions on both the hacksaw frame and blade.

Abstract: A hacksaw includes a U-shaped frame and a handle connected to a first end of the frame and an engaging port is connected to a second end of the frame. A groove is defined longitudinally in the handle and a passage is defined in the handle. The passage intersects the groove and communicates with the groove. A retaining member is movably received in the passage and a recess defined in the retaining member so that a blade extends through the groove and the recess. The blade is engaged with the engaging port. A cam member is pivotably connected an end of the retaining member such that the retaining member is lifted to secure the blade between an inside of the recess and the inside of the groove by pivoting the cam member. The blade is easily loosened by pivoting the cam member in the other direction.

Abstract: A hacksaw in which one or more perishable hacksaw blades are conveniently stored and accessed. The hacksaw includes a beam, which defines a blade storage cavity, a handle and a fastening member that is employed to fixedly fasten the beam to the handle. The fastening member is positioned relative to the beam such that it does not interfere with the movement of the hacksaw blade(s) in the blade storage cavity. A plug, which frictionally engages at least one of the fastening member, the beam and the handle, is employed to seal off an end of the blade storage cavity.

Abstract: A saw blade chuck includes a blade retaining unit, a biasing unit, and a pushing unit. The blade retaining unit is mounted pivotably on a driving arm of a scroll saw. The biasing unit and the pushing unit are disposed on opposite sides of and act upon the blade retaining unit such that the biasing unit biases the blade retaining unit to pivot to a first position, where the blade retaining unit is adapted to engage one end portion of a saw blade, and such that the pushing unit is operable so as to provide a pushing force for pushing the blade retaining unit in a linear direction to cause the blade retaining unit to pivot against biasing action of the biasing unit to a second position, where the blade retaining unit is adapted to disengage from the end portion of the saw blade.

Abstract: A hacksaw includes a saw blade detachably secured between a frame and a handle. An arm is rotatably secured to the lower portion of the handle, a lever is rotatably secured to the upper portion of the handle, and a rod received in the handle coupled between the lever and the arm. The lever is depressible to engage with the handle and to force the arm to engage with the handle, and to tension the saw blade between the frame and the handle. A lock device is slidably the handle and movable toward and away from the lever for selectively securing the lever to the handle.

Abstract: A two-position, quick-change hacksaw consists of a back member, handle structure adjacent a rearward end portion of the back member, and a swing arm adjacent the forward end. The free end of the swing arm and the forward end portion of the back member have coplanar blade-engaging elements thereon which serve to engage the forward end of the blade and which are commonly disposed on an arc that circumscribes a third coplanar blade-engaging element disposed on a coupling block of a tensioning mechanism for mounting the rearward end of the blade. Two coplanar sets of transversely paired engagement elements enable mounting of the blade both in a plane parallel to a medial plane of the frame and also in a plane disposed at a substantial angle thereto. In one configuration, with the swing arm in its inoperative position, the saw is adapted for cutting within a relatively confined space; with the swing arm in its operative position the saw is configured for cutting within a relatively unconfined space.

Abstract: A handsaw capable of cutting a glass bottle includes a band-like handsaw substrate which is obtained by cutting a steel strip at a predetermined length, a blade portion of hard abrasive applied, by deposition, to at least one edge of the band-like handsaw substrate in the width direction, and a grip portion which allows the band-like handsaw substrate to be manually held. A method for manufacturing a handsaw capable of cutting a glass bottle, and a method for reusing empty wine bottles are also disclosed.

Abstract: A light duty electric reciprocating handsaw includes a body assembly having a throat therein, a removably and reciprocally attached saw blade within the body assembly spanning the opening of the throat so that any workpiece that fits inside the throat can be cut across its width. The handsaw is either electrically or battery operated and includes an electric motor mounted within the body assembly, the weight of the motor being generally distributed over the saw blade. Preferably, the throat of the body assembly is generally defined by an upside down U-shaped configuration for receiving the workpiece therein after cutting with the saw blade. A balance of the weight is located generally over the saw blade, with the remainder of the weight of the unit being distributed generally evenly throughout the rest of the handsaw such that the operator will experience an aid in cutting the workpiece through the force of gravity.

Abstract: A hacksaw including a frame, a handle, an end piece, and a blade. The frame has an arcuate support rod which is provided at one end thereof with a protrusion and a plurality of recesses, and at the other end thereof with a protrusion and a plurality of recesses. The handle has a top cross rod which is provided with a receiving slot and a plurality of projections and is fastened at one end thereof to the arcuate support rod such that the receiving slot of the top cross rod receives the protrusion of the arcuate support rod, and that the projections of the handle are received in the recesses of the arcuate support rod. The handle is provided with a fastening member opposite in location to the top cross rod for fastening one end of the blade. The end piece is fastened to other end of the arcuate support rod and is provided with a slot for receiving the protrusion of the arcuate support rod, and a plurality of projections which are received in the recesses of the arcuate support rod.

Abstract: A thin saw blade with four cutting surfaces of fixed lengths in line, each cutting surface rotated with respect to the preceding cutting surface to enable a user to change cutting directions of the blade without rotating the material to be cut. A second embodiment uses a blade with two cutting surfaces of fixed length with cutting surfaces on opposed edges of the blade requiring only a single twist and enabling cutting of thicker pieces of material with longer strokes. A preferred embodiment uses the blade in a coping saw with each rotation being 90 degrees enabling rapid smooth cuts of thin materials for handicraft projects. Rubber O-rings secure the blade in anchor bolt slots to secure the blade while cutting in different directions. The blade could also be used in electric sabre saws or bench jig saws which would require adjustment of the work support surface to change cutting directions.

Abstract: A thin saw blade with four cutting surfaces of fixed lengths in line, each cutting surface rotated with respect to the preceding cutting surface to enable a user to change cutting directions of the blade without rotating the material to be cut. A preferred embodiment uses the blade in a coping saw with each rotation being 90 degrees enabling rapid smooth cuts of thin materials for handicraft projects. Rubber O-rings secure the blade in anchor bolt slots to secure the blade while cutting in different directions. The blade could also be used in electric saber saws or bench jig saws which would require adjustment of the work support surface to change cutting directions.

Abstract: An improved hacksaw for rigorous use has two embodiments, one with a high available cutting depth exceeding five inches, and another with a low clearance with attendant low cutting depth. The saw is easily constructed of inexpensive materials and has a blade alignment bow whereby forces exerted on the bow by the blade are closely aligned to minimize lateral bending and enable precise cuts.

Abstract: A hacksaw of the type utilizing an elongated blade maintained tension between respective legs of the saw frame includes a cam-actuated blade tensioning mechanism. One leg of the saw frame includes a fixed blade pin for receipt through a mounting hole defined at one end of the elongated blade. The other leg of the saw frame includes a pin carrier having a blade pin for receipt through the mounting hole defined at the other end of the elongated blade. The pin carrier is pivotal between a blade release position and a blade securement position. In presently preferred embodiments, the pin carrier defines a cam follower engaging an elliptically arcuate cam surface defined on a pivotal actuator member. The actuator member may have a lever portion for providing mechanical advantage during its pivotal movement. A releasable lock mechanism is provided to maintain the actuator member, and thus the pin carrier, in the blade securement position during use.

Abstract: A saw includes a C-shaped frame having a C-shaped channel and having a beam and an arm dependent downward from the front portion of the beam and a handle secured to the rear portion of the beam. An endless abrasive coating cable is engaged in the channel of the frame and includes an exposing portion disposed between the arm and the handle. A fastener is secured to the lower portion of the arm and includes a passage for receiving the cable and for securing the cable to the frame.

Abstract: A bow saw provided with a handle on the rear end of its bow-shaped frame can be coupled to a rod (32), for instance a telescopic rod, by a rod-attachment coupling. For this purpose, the rear section of the bow-shaped frame (10) has a detent element (34) which is welded on it which is surrounded by the handle shell (30) of the handle and a device insertion pin (36) which is swingably fastened on the frame (10) by fork arms (38) in the region of the detent element (34). This device insertion pin (36) can be form-locked to the detent element (34) in the outward-swung position of the handle so that the device insertion pin (36) protrudes towards the rear and a rod (32) provided with a corresponding insertion hole and a coupling can be pushed onto it. The movement of the device insertion pin (36) into the coupling position is effected by entrainment upon the swinging of the handle shell (30).

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 aver a constant path of travel to avoid misalignment.

Abstract: An open-ended handle is disclosed for use with framed saws, such as coping saws. The open-ended handle is generally J-shaped and has a grip member that is perpendicular to the saw blade. The open-ended handle is mounted to the saw such that the grip member is also symmetrical about the mounting point. The present invention provides an arrangement in which the hand-grip portion of the handle is symmetrical about a longitudinal axis of motion when the saw is in use to allow the greatest amount of power to be transferred to the saw blade along a single line of force which not only provides for accurate cutting, but also eases tension on the user's hand and wrist to reduce fatigue. This arrangement provides a saw that is equally balanced and usable in both an upright position and an inverted position for accurate and easy cutting in a downward direction as well as an upward direction.

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: A saw frame having a bow shape has a blade carrier adapter at one end and a tensioner at the other end, between which a blade is tensioned in use. The tensioner is constructed for obtaining a predetermined tension in the blade independently of the manufacturing tolerances and in a substantial range of hole spacings of the blade.

Abstract: The invention is to the combination of an attachment device and the combination of the attachment device with a saw blade for use with a standard hack saw frame. The attachment device has an arm that is inserted into one end of the hack saw frame where the blade is attached. A saw blade having at least one hole in a first end and a plurality of holes spaced apart in a second end is mounted between the attachment device and the hack saw frame, with one end of the saw blade extending beyond the hack saw frame such that the end of the saw blade extending beyond the hack saw frame can be used to saw in restricted or limited access areas.

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 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: 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: 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.