Abstract: A self-propelled cutter has a gear assembly to provide both downward and forward force on a material to be cut. A gear assembly includes a drive input gear that engages with a transfer gear and propulsion gear engaged with the transfer gear by a lever arm. The drive gear and transfer gear are coupled and fixed to the cutter body but the propulsion gear rotates about the transfer gear via the lever arm. This gear assembly enables the propulsion gear to move as required to provide both downward and forward force on a material to be cut, such as a cast. A self-propelled cutter may have a drive input that is coupled with a drive input device, such as a crank or an electric motor. A cutter may have a first gear assembly on a first side of the cutter body and a second gear assembly on a second side.

Abstract: A chain saw comprising a main body, a shell, a motor, a motor output shaft, a cutting element, a supporting plate and a handle; the shell is provided on the main body; the motor is mounted inside the shell; the motor output shaft is used for driving the cutting element to rotate; the handle is mounted to a rear end of the main body via a connection tube; the chain saw also comprises a lever rod on the main body; the lever rod is movably connected to an upper protection panel and a lower protection panel both disposed on a front end of the main body; the supporting plate is fixedly connected to the front end of the main body and accommodated between the upper protection panel and the lower protection panel; the lever rod and the lower protection panel are connected with each other via a connection mechanism.

Abstract: A vegetation pruning device (2) includes a pair (4,6) of pivotally coupled arms. A motor bracket (36) with a rotary output drive (34) provides drive to a cutting element (8) which is coupled to the rotary output drive (34). The cutting element (8) is arranged for cutting vegetation (44) presented thereto.

Abstract: A vegetation pruning device (102) includes a pair (114, 116) of pivotably coupled handles and a motor having a rotary output drive (130) for driving an endless flexible cutting chain (108). A guard (162) is moved relative to the chain (108) by pivoting the handles (114, 116) relative to each other to grip vegetation between the guard (162) and the chain (108). The guard is provided with a pair of curved upper surfaces (164) having teeth (166). The rotary output drive (130) of the motor is arranged generally coaxially with the axis of pivotal movement of the handles (114, 116).

Abstract: A double chain saw arrangement which has diametrically oppositely extending chain saws powered by a single motor driving two sprockets on said hub, each engaged with an associated chain saw chains on each chain saw bar mounted to the hub. A series of hooked capture pieces project from one side of the chain saw bars in a plane parallel to the chain saw bars, which pieces act to cause brush and limbs to be captured and forced into contact with the saw chains to be cut thereby.

Abstract: The invention relates to a powered reciprocating saw. To simplify use of the saw, a clamping mechanism is provided which holds an object in position while it is sawn. The clamping mechanism is mounted at the front of the housing of the saw near the saw blade. The clamping mechanism comprises: a slide element for sliding movement in the cutting direction, a supporting member, and a clamping arm rotatably mounted on the slide element by a one way clutch to clamp an object therebetween in a clamping position below the saw blade. When the saw is in use, it vibrates. Since the clamping arm has a moment of inertia with respect to the axis of rotation of the one way clutch, the oscillating movement is transformed into a progressive rotational movement of the clamping arm to clamp an object.

Abstract: A electrical power tool with a circular saw blade attached to a drive shaft of an electric motor. The power tool includes a pipe engaging bracket. The pipe-engaging bracket includes a “L” shaped bracket arm having a first arm member and a second arm member. The first arm member is attached to a side of the housing. The second arm member is at right angles to the first arm member. The second arm member includes a pair of spaced apart guide pin holes for receiving a center portion of a pair of guide pins therethrough. An upper portion of the guide pins is received through a pair of coil springs. The coil springs are held on the upper portion of the guide pins using spring stops. A lower portion of the guide pins includes ends attached to a guide arm. The guide arm is parallel to the second arm member. The guide arm includes a pair of spaced apart guide fingers with pipe grooves therein. The guide fingers are disposed on opposite sides of the saw blade.

Abstract: A pruner attachment apparatus includes a body releasably attachable to a shoe of a power tool of the type having a reciprocating saw blade. The body includes a front face for engaging a workpiece. The pruner attachment apparatus further includes a hook member for engaging the workpiece. The hook member is laterally spaced from the saw blade of the tool and is mounted to the body for movement along a path between a first position and a second position. The path includes an upper curvilinear portion configured such that movement of the hook member from the first position to the second position positions the hook member completely behind an imaginary line in a common plane with the front face. A biasing mechanism biases the hook member to the second position.

Abstract: A portable, hand held exhaust pipe cutter having an air motor to drive a cutting wheel arranged parallel to a drive shaft of the air motor by an angle head gearing device. The cutter makes straight cross-sectional cuts through cylinders by using a feed lever pivotally attached to the air motor that engages the cylinders to be cut and guides them into engagement with the cutting wheel. The feed lever on an opposing end includes a handle that extends along the air motor so that a user can grip both the control lever of the air motor and the handle of the feed lever simultaneously with a single hand.

Abstract: A main spindle of an air saw is reciprocated by sliding a piston in a cylinder chamber with the pressure of air supplied to the cylinder chamber via an air supply path so as to alternately apply the air pressure to pressure-receiving surfaces of a back plate and a front plate, wherein a rear air-cushion chamber is formed in a portion for fixing a return spring for urging the back plate toward the center of a cylinder while a front air-cushion chamber is formed in a portion for fixing a return spring for urging the front plate toward the center of the cylinder, so that the front and rear balance is maintained.

Abstract: A pruner attachment apparatus for a power tool having a body, a shoe extending from the body, and a saw blade interconnected to the body for reciprocating motion. The pruner attachment apparatus includes a mounting member, a hook member and a biasing mechanism. The mounting member is releasably attachable to the shoe. The hook member is carried by the mounting member for movement between a first position and a second position. The biasing mechanism biases the hook member to the second position.

Abstract: The invention relates to a powered reciprocating saw, in particular, to a pruning saw. To simplify use of the saw, a clamping mechanism is provided which holds an object in position while it is sawed. The clamping mechanism includes a clamping arm that is mounted at the front portion of the saw housing near the blade by a one way rotary clutch such that the arm can freely rotate in only one direction. During use, the saw vibrates due to its reciprocating parts. Since the clamping arm has a center of mass spaced apart from the axis of rotation provided by the one way rotary clutch, a progressive rotational movement of the clamping arm results which thereby automatically closes to clamp the object to be cut.

Abstract: The pipe cutter attachment has a way mounted on a portable power saw with a reciprocating saw blade. The way is mounted on the power saw by an attaching assembly that accommodates the power saw that is used. A pipe holder block is slidably supported by the way. A pipe receiving slot with an open end is formed in the pipe holder block. The saw blade is in a saw blade slot in the pipe holder block. During cutting of a pipe the saw blade moves into the pipe receiving slot, engages a pipe to be cut and moves toward the open end of the pipe receiving slot. A resilient member urges the pipe holder block toward a position in which the saw blade is in the pipe holder block and ready to engage and cut a pipe seated in the pipe receiving slot.

Abstract: A removable attachment for use with a hand-held tool is disclosed. The tool comprises a housing and a cutting blade mounted therein for continuous reciprocating movement during operation. The attachment comprises a work piece receiving member pivotally mounted to the tool housing. An adjustable clamping member is pivotally mounted to the work piece receiving member. An adjuster, movable between an operable and a non-operable position, is operably connected to the clamping member for adjusting the clamping member so as to clamp a work piece positioned on the work piece receiving member for operation thereon by the cutting blade. A quick release mechanism comprising a sliding member, movable between a first position and a second position, is provided for quickly moving the adjuster between its operable and non-operable positions.

Abstract: A jigsaw-type saw blade, typically 6".times.3/8".times.1/8" stainless steel having teeth angled to saw only in a thrusting direction, is fixed to a handle, typically plastic, that engages the thumb. Two jaws of a sliding vise member each slide independently along the saw blade. A first one of the vise's jaws is biased in separation from the handle by a spring that extends coaxially about the saw blade between the jaw and handle. The remaining, second, jaw presents an external surface contoured to receive two fingers disposed in symmetrical positions on either side of the saw blade. In use for clamping and sawing, a workpiece is inserted between the vise's jaws and into a first position proximate to the saw blade while the sliding vise member is in a position extended from the handle. The handle and the second jaw are grasped and squeezed between the thumb and a two fingers, thereby simultaneously clamping and sawing the workpiece.

Abstract: A protective device for a chain saw comprising a generally U-shaped mounting bracket carrying pivot means pivotally supporting an elongate protecting bar spring biased towards a rest position in which the bar extends generally parallel to the chain of the chain saw in use, mounting plate means secured to one side of said mounting bracket and having a rearwardly extending portion formed with openings through which the chain bar mounting bolts of the chain saw pass for securement of said mounting plate to the body of the chain saw by means of the chain bar mounting nuts. The protecting bar has an inverted channel shaped configuration which defines a saw dust confining passage through which the saw dust passes in use. The protecting bar extends beyond the end of the chain of the chain saw to enable contact between the bar and the object to be cut without contact between the chain saw and the object.

Abstract: A tool for cutting a ring while the ring is lodged on a finger. The tool comprises a housing upon which a pivot arm and a motor driven circular saw blade are mounted. The tool is put to use by placing one end of the pivot arm under the ring and applying thumb pressure to the opposite end of the pivot arm to draw the rotating blade toward the ring. The blade is mounted on a high-mass, heat-conductive drive shaft which acts to dissipate the heat produced by the cutting action of the tool. Electrical cut off means are provided to turn the drive motor off when the blade has cut through the ring.

Abstract: A tool for cutting a workpiece comprising a tool body; means on the tool body for securing the workpiece; a saw blade movably supported on the body for cutting the secured workpiece, the saw blade having a plurality of cutting teeth movable in a sawing direction and a feeding direction in a cutting plane extending through the workpiece; and a bushing on the tool body rotatable about an axis normal to the cutting plane, the bushing being engagable on its periphery by the saw blade teeth and rotatable thereby, after cutting of the workpiece, to restrict movement of the saw blade in the feeding direction while permitting movement of the saw blade in the sawing direction. In the preferred embodiment the bushing includes teeth on the periphery which are of comparable size and spacing to the teeth of the saw blade to clean the latter. The bushing may be made of a bronze porous powder metal which is impregnated with a lubricant for lubricating the saw blade teeth.

Abstract: A hand tool comprising elements for clamping a conduit or cable to be cut, a saw blade supporting assembly pivotally connected to the clamping elements, in a manner to guide the saw in its desired cutting path, and means for causing sawing movement of the saw blade, the saw blade supporting assembly and the clamping elements being so juxtaposed that they can be gripped by one hand of the tool operator to cause both gripping of the work and advancement of the saw blade in its cutting position; the other hand of the operator being available to effect cutting movement of the saw blade.

Abstract: The multi-purpose plumbing tool is designed specifically for use with copper tubing to enable cutting and preparation of cut ends and associated fittings for soldering on a job site. Basically, the tool includes a frame supporting a motor driven high speed circular pipe saw. A handle and pipe vise structure in turn is pivoted as a unnit to the frame in such a manner that a pipe gripped in the vise can be swung downwardly and forwardly into engagement with the circular saw blade and thereby cut. The same motor driving the saw blade is utilized to drive rotary wire brushes for cleaning the outside of cut ends of the pipe and the inside of fittings. Appropriate deburring and reaming operations are also performed by these rotating structures. Finally, flux applicator heads are provided to treat the cleaned pipe end surfaces and inside the fittings with appropriate flux paste preparatory to soldering, these flux applicator heads being held on the frame and supplied by paste from a cartridge carried in the frame.

Abstract: A chain saw antipinch guard arm including an arm attached pivotally to a chain saw, the arm being movable in a plane substantially parallel to the plane of the blade. A handle extends upwardly from the arm and is pivotal therewith. The arm may be manipulated by the saw operator with a scissor-like action with respect to the blade and may be used for applying a force to the underside of a piece being sawn, thereby preventing pinching of the blade, while at the same time protecting the operator from injury.

Abstract: A pruning saw having an arcuately shaped housing which guides a flexible saw blade as the blade moves back and forth within the housing. The saw blade is comprised of toothed blade segments, pivotally fastened together. Each segment has its teeth bent or set to produce a kerf which is greater in width than the width of the housing.