Abstract: A portable power chain saw with at least one grip for carrying the saw which grip is attached by interpositioning of at least one vibration attenuating member and attachment parts to the motor housing of the saw. The grip and the housing are connected to one another with at least one support part associated with said journal being provided.

Abstract: A mill for guiding the cutting of a chain saw includes a mill frame comprising a pair of longitudinally spaced, parallel members joined by a plurality of rod-like runners extending orthogonally therebetween and joined to the lower surfaces thereof. A chain saw bar may be secured subjacent to the mill frame and selectively spaced therefrom by a pair of bolts extending through the chain saw bar to the mill frame, and a plurality of tubular spacer members secured on each bolt between the bar and the mill frame. The runners of the mill frame ride on a plank secured on a log or on a previously cut surface to guide the chain saw in making planar, longitudinal cuts through a log. A slider assembly is also provided, clamped to the longitudinal members of the mill frame, and adapted to secure the chain saw in spaced relation therefrom with the chain saw bar extending downwardly therefrom.

Abstract: A portable motor driven working implement for agriculture and forestry, especially brushcutter, which includes a first implement part subjected to vibrations which through the interposition of at least one elastic insulating element is connected to a second implement part on the side of a handle of the implement, the rigidity characteristic of the insulating element being adjustable.

Abstract: A chain sawing machine has an engine and a chain saw driven by the engine. Handles are connected to the engine through vibration damping or shock absorbing elements. The rear handle has a surface providing an instrument board on which engine tachometer and fuel and oil gauges are provided. The tachometer and gauges are electrically energized by an electric power source which is mounted within the rear handle and which is independent of the electric power source required by the engine operation.

Abstract: An improved tree harvester and buncher of the horizontally articulated type with stump gripper, as described in my U.S. Pat. Nos. 3,991,799 and 3,946,775, and 4,013,106, wherein the tree cutting device is lowered to reduce stumpage waste and the actuating motor thereof is raised to prevent trash interference therewith. Also a tree chock is independently pivoted to follow the the tree cutting device into a tree cut as the cut is opened by horizontal articulation of the harvester and buncher to chock a tree against vertical slippage in tree supporting grapples and the stump gripper on the stump for preventing the cutting device from binding in the cut or being bent therein. Also a stump penetrating member is mounted below the tree cutting device for penetrating the stump, and in cooperation with the stump gripper, assist in preventing movement of the harvester and buncher relative to the stump.

Abstract: There is disclosed a reciprocating chain saw made up of a length of chain formed by a plurality of serially pivotally connected cutters, a number of which cut when the chain is moved in one direction, and a number of which cut when the chain is moved in the other direction. In one use of the chain saw, it is adapted to be connected at its opposite ends to the two branches of a rope or the like, one end of which may be thrown up and around the limb of the tree which is to be cut. The cutting means disclosed are generally similar to those of conventional motor driven chain saws with the exception that no sprocket means need be provided on the chain. In one of the disclosed embodiments of the chain saw of the invention, the chain is so constructed that it can bend or flex in only one direction, so that the disposition of the chain, in the correct position upon a limb to be cut is assured.

Abstract: The present invention relates to an adjustable utility extension handle for a small electrically powered handtool. An elongated support pole is provided having a first handle coupled to a lower end thereof for being grasped by the operator to provide a first manual support point. A second handle is movably mounted along the pole for providing a second manual support point. The first handle includes a power regulating device which is interposed along an electrical conductor which supplies electrical power to the power handtool, thereby allowing the operator at the lower end of the elongated support pole to regulate the speed of the power handtool.A tool coupler is removably attached to the power handtool. The tool coupler includes an actuator for engaging and fully actuating any electrical power control which regulates the operation of the power handtool.

Abstract: A portable chain saw having a drive-part assembly including an engine, saw chain and so forth, and a supporting assembly including a front and a rear handles and so on. These two assemblies are resiliently connected to each other through a plurality of tubular resilient connecting members. Each of the tubular resilient connecting members carries at its outer peripheral surface one of the two assemblies, and is connected to the other assembly through a screw or a bolt received by the bore thereof.

Abstract: A chain saw having a housing in the form of a plastic shell of structural foam fully open on one of its lateral sides to expose a central chamber. The chain saw includes an integral motion assembly formed of an engine, a blade mounting bracket, forwardly projecting blade and driven cutter chain. A mounting plate is secured to the underside of the engine, the plate being formed of a thin plate of metal having substantially parallel front and rear edges received in front and rear grooves within the shell, the central chamber being sized to receive the engine so that the engine and mounting plate may be slid into seated but floating position in the chamber in the manner of a drawer. Resilient connectors interposed between the engine mounting plate and the shell and interposed between the blade mounting bracket and the shell hold the motion assembly in seated position.

Abstract: A chain saw driven by a two-cycle opposed cylinder engine of simultaneous ignition type. The vibration energies generated in respective cylinders are offset by each other partly because the cylinders are made to oppose to each other, and partly because the ignitions of these cylinders take place simultaneously. Further, the opposed cylinder engine provides ample spaces above and below the cylinders. These spaces are conveniently used for accommodating intake system including a carburetor and so forth and exhaust system including a muffler and so forth. Sound shielding walls are disposed in the ample space around the cylinders so as to insulate the noise caused by the engine and, at the same time, to define a sufficiently large cooling air passage.

Abstract: The control valve mechanism of, for example a hydraulic motor for a chain saw, includes a two-position spool having a hollow interior permanently connected to reservoir and a cylindrical wall formed with ports which are closed in one valve position and open in the other valve position. During movement of the spool into the motor-operating position, a lubricant passageway is opened before the motor is fully operational.

Abstract: A cutting device designed to shear vegetation such as grass comprising an endless cutting member laced about drive and idle pulleys. The endless cutting member comprises, in the first embodiment of this invention, an endless cable wrapped circumferentially by a helical coil with cutting elements and cogs mounted thereon. In a second embodiment, the endless cutting member comprises an endless steel band with cutting elements welded thereon. In both embodiments, the cutting elements move between two rows of teeth of a comb disposed along the frontal cutting portion of the cutting device, thereby shearing the grass as the cutting elements flow between the teeth.

Abstract: A braking system including a sensing lever operated when the forward portion of a chain saw moves upwardly with a jerk due to a kickback phenomenon or the hand of an operator slips from a handle during operation, a brake device, and a direct-acting interlocking member connecting the sensing lever to the brake device. A force exerted on the sensing lever and a force of a spring locking the sensing lever are both transmitted to the brake device through the interlocking member.

Abstract: A mill for guiding the cutting of a chain saw includes a pair of rail members, each rail member comprising a length of C-channel, with a lip joined to the distal edge of one leg of the channel and extending parallel to the web of the channel. At least one hole is disposed in the web of each channel length, and a long bolt extends through the hole to join the rail members in parallel disposition. A plurality of rectangular spacer members of various thicknesses are each provided with a hole therethrough to receive the bolt. The bolt extends through a hole in the chain saw bar near the power head to assemble the rail members and spacer members to the chain saw. The lip of one rail member acts as a rip fence riding on a previously cut edge, with the spacers employed to join the chain saw bar to the rip fence at a selected spacing interval therefrom.

Abstract: A chain saw including an improved suspension system characterized by a U-shaped hand grip means extending transversely across a longitudinal median plane of a guide bar means, with the U-shaped hand grip means being contiguous with a longitudinally extending rear handle and serving to house, at least in part, a portion of the chain saw vibration isolation system.Generally longitudinally aligned vibration isolation units are constrained by abutment means and axially oppositely directed mounted shaft means to impede axially oppositely directed movements of a vibration generating assembly relative to the chain saw suspension system.

Abstract: A vibration isolating system for chain saw structures characterized by a handle assembly connected to one side of a vibration generating assembly of a chain saw by a pair of resilient suspension means, with cross-over linkage means being operable to transmit force from the handle assembly to the other side of the vibration generating assembly, across the top of the engine means of this assembly.A chain saw handle structure of structural foam, connected to a chain saw by resilient, vibration isolating assemblies.

Abstract: Disclosed is a motorized chain saw, comprising: a handle-housing member including at least one handle for carrying the saw; at least one crankcase member; and at least one means including a vibration-damping elastic member for providing a shock absorbing connection between the housing member and the crankcase member. The elastic member is laterally expandable and includes at least one axial expansion opening for accepting a selectively insertable means for expanding the rubber elastic member.

Abstract: A guard member is mounted on the chain saw for swinging movement between an actuate position and a reset position. The guard member occupies a normal position between the actuate and reset positions. A brake band is integral with a bowed column spring which applies the braking force to arrest movement of the cutting chain. A latching mechanism includes an arm with a latch pin engaged by a yieldable latch finger; this latch finger is integral with the bowed column spring. The guard member deflects the latch finger in response to movement of the guard to its actuate position; this action allows the column spring to apply the brake. The guard member is moved to its actuate position in response to a sudden movement of the chain saw, as in the case of "kickback"; this movement of the guard member is brought about by inertia or the engagement of the guard with the operator's body (most likely the wrist or the back of his hand) during this abrupt movement of the chain saw.

Abstract: Pads of vibration damping material between the rear end of the guide bar and the case of a chain saw and between the rear end of the guide bar and the drive case cover reduce the transmission of guide bar, chain and sprocket vibration and noise to the chain saw case.

Abstract: A sprocket wheel arrangement adopted particularly for drives in mining machines as, for example, push-plate conveyors and mining equipment. The number of teeth on the sprocket wheel is smaller than the number of seats between the working surfaces of the teeth and cooperating with chain links passing over the sprocket wheel. The seats are open from one side, and are provided with retaining walls only from the side of the teeth. The planes of bottom lands of adjacent seats intersect and form, thereby, an edge. The sprocket wheel arrangement may be used in driving systems of both coil chains and fish-plate chains.

Abstract: Disclosed herein is a chain saw including a drive shaft, a chain sprocket and a clutch including a drive member driven by the drive shaft and a driven member for rotating the chain sprocket in response to rotation of the drive shaft. One of the members is axially movable relative to the other between an engaged or driving position and a released position wherein they are disengaged from each other. The drive and driven members have intermeshing clutch teeth which coact to produce an axial force in a direction tending to separate the axially movable one of the members from the other. The members are releasably held in the driving position by a resilient element which is movable between a first position wherein it yieldably resists axial displacement of the axially movable one of the members and a second position which is spaced from the first position so as to permit movement of the axially movable one of the members to the released position.

Abstract: A chain saw including a flexible, resilient skid mounted by means providing torsional and axial stress relieving action whereby enhanced vibration isolation is obtained and certain resonant vibration is eliminated.A skid for use in a chain saw powered by a vibration inducing drive assembly. The skid has a flat portion for resting the saw on a surface, a foot rest portion, and an upwardly directed rear portion, and is connected to the remainder of the chain saw structure by a pair of attachment means. The first attachment means connects a front portion of the skid and a front handle to the drive assembly and provides for axial stress relieving relative motion between the skid and drive assembly. A second attachment means connects the upwardly directed rear portion of the skid to a rear handle and provides for torsional stress relieving relative motion between the skid and the handle.

Abstract: A chain saw safety brake including a snap-acting, over-center actuating mechanism.A chain saw safety brake and method of operation characterized by an actuation accelerator interposed between a brake mechanism and a brake actuating mechanism. A biasing means is operable to bias the brake actuating means toward a nonactuating position with a relatively lower biasing force. The biasing means is operable to bias the brake actuating means toward an actuating position with a relatively higher biasing force.

Abstract: In a vibration reducing system for a single cylinder engine, the rotating inertia forces are balanced while the reciprocating inertia forces are left unbalanced. The engine is mounted on a support by a spring biased linkage system permitting movement of the engine in a direction axial of the engine cylinder. The engine support also includes torsion mounts permitting controlled rotary movement of the engine about the crankshaft axis. Power transmission is through a drive shaft mounted on the support and connected with the engine crankshaft by a belt drive. The supporting linkage is biased to position the engine with the axis of the cylinder approximately normal to a plane defined by the axes of the crankshaft and the drive shaft.

Abstract: A method and apparatus for removing entrained matter from the intake air of a chain saw internal combustion engine of the type including at least one piston and cylinder, a crank shaft, and a carburetor.The apparatus includes a shroud surrounding at least one end of the crank shaft with an air inlet fashioned into the shroud at a position adjacent to said one end of the crank shaft and an air outlet fashioned into the shroud at a position remote from the air inlet. An air passage opens into the shroud adjacent the crank shaft for providing fluid communication between the interior of the shroud and the carburetor. The crank shaft is provided with a hub having on opposite faces thereof a first and second cascade of radial flow compressor blades to centrifugally impel air and entrained particulate matter away from the crankshaft. The compressor blades serve to remove at least a portion of the entrained matter from the combustion inlet air prior to the air entering the air passage for delivery to the carburetor.

Abstract: A brake for quickly stopping the cutting chain of a chain saw in the event of a kickback or other mishap comprises a narrow band of spring steel which wraps at least 11/4 turns around the drum of the centrifugal clutch by which the chain is driven. One end of the band is anchored while the other end is connected to an operating lever which is rotatable between a released position in which the brake band is released from the drum and an applied position in which the brake band is applied to the drum. The operating lever has a peripheral portion which has an interfering engagement with a cooperating portion on a rotatable actuating lever to which a guard or other sensing member is connected. By reason of this interfering engagement the operating lever remains in one or the other of its positions until forcibly moved to the other position by the guard member operating through the actuating lever.

Abstract: A clutch arrangement for a motor driven chain saw having a first clutch element driven by the motor shaft and a second clutch element normally engaged with the first clutch element but disengageable therefrom and a centrifugal clutch between the second clutch element and the drive sprocket for the saw chain. The second clutch element includes a spring disc and is axially yieldable between clutch engaged and clutch disengaged positions. A lever is provided moveable for disengaging the clutch elements and a brake member connected to the lever is operable for braking the drive sprocket when the clutch elements are disengaged.

Abstract: A portable chain saw includes a flexible brake band for stopping the cutter chain. A sensing arm is pivotally mounted on the chain saw housing, with the brake band being connected to this sensing arm. The sensing arm is arranged to be engaged by an arm or hand of an operator so as to be swung forwardly in a brake-tightening manner. The sensing arm is continuously biased forwardly to a braking position by a coil compression spring. A latch normally holds the sensing arm in a rest position. The latch comprises a metallic strip one end of which is fixedly secured to the housing. The other end of the strip has a bent configuration defining a notch for receiving a curved projection of the sensing arm to retain the latter. The strip extends forwardly from the housing in overlying position above the spring and projection.

Abstract: A vibration-isolation system uniquely adapted for use in connection with chain saws where vibration-isolation units resiliently interconnect a vibration-generating engine and cutter chain assembly with an inertia-providing handle assembly. The improvement of the invention resides in a bifurcated, resilient diaphragm means constituting at least one such vibration-isolating unit. The improved bifurcated, resilient diaphragm means includes a resilient, generally annular base and first and second axially displaced, first and second resilient generally toroidal segments located on opposite sides of a generally annular, vibration and deflection-accommodating recess means. The bifurcated diaphragm means may also be considered as including a resilient, generally annular base, with first and second resilient, generally annular rim means being supported by first and second resilient cantilever means located on opposite axial sides of the generally annular, vibration and deflection-accommodating recess means.

Abstract: Disclosed herein is a chain saw comprising a frame having a handle, a clutch driven by a drive shaft driven by an engine mounted on the frame and including a clutch shoe movable in response to clutch shoe rotation relative to a position of driving engagement with a rotatable clutch drum and selectively operable means for preventing engagement of the clutch shoe with the clutch drum, a bar mounted on the frame for movement between a first position spaced from the handle and a second position adjacent to the handle, means operably connected to the bar for operating the means for preventing engagement of the clutch shoe with the clutch drum to prevent clutch shoe engagement when the bar is in the first position and to permit clutch shoe engagement when the bar is in the second position, and means operable for braking rotation of the clutch drum when the bar is in the first position.

Abstract: A portable chain saw includes a flexible brake band for stopping the cutter chain. A sensing arm is engageable by an arm or hand of an operator to be swung forwardly to tighten the brake band. The sensing arm is continuously biased forwardly to a braking position by a power torsion spring. The same torsion spring also serves to normally hold the sensing arm in a rest position. A latch can be utilized to transmit latching forces from the torsion spring to the sensing arm. Alternatively, the torsion spring itself can serve as a latch to resist forward movement of the sensing arm. The torsion spring is yieldable to enable the sensing arm to be unlatched in response to being struck by the arm or hand of an operator and then swung forwardly by the torsion spring.

Abstract: Apparatus is disclosed for extending the reach of a portable chain saw for the purpose of cutting tree limbs and branches which would otherwise be inaccessable to the operator of the saw. An elongated post which can be held in the hands is equipped with means for securing a chain saw thereto at the front end. A pivotable lever is also attached to the front end of the post for contacting and depressing the power trigger on the chain saw. A finger operated control trigger is located at the rear end of the post, and means are provided for connecting the pivotable lever and the control trigger so that the lever is pivoted and the power trigger of the saw is thus depressed by the lever when the control trigger is operated.

Abstract: Disclosed herein is a chain saw oil pump comprising an engine supported by a suitable frame, a pumping chamber defined by the frame and including an inlet and an outlet, a pumping member reciprocal and rotatable in said pumping chamber relative to the inlet and to the outlet so as to effect pumping operation incident to such reciprocation and rotation, and a spring biased gear for yieldably drivingly connecting the pumping member to the engine for rotation of the former in response to operation of the latter.

Abstract: A chain saw adapted to damp mechanical vibrations comprising a front handle attached to the front portion of the engine section through a plurality of vibration dampers made of rubber or like material, a connector made of a rigid material connected to the front handle and disposed downwardly of the engine section to extend rearwardly thereof, and a rear handle attached to the upper portion of the rear wall of the engine section through at least one vibration damper made of rubber or like material. The connector is connected at its rear end portion to the rear handle through a vibration damper made of rubber or like material and at its intermediate portion to the underside of the engine section through a vibration damper made of rubber or like material.

Abstract: A chain saw safety brake including a snap-acting, over-center actuating mechanism.A chain saw safety brake and method of operation characterized by an actuation accelerator interposed between a brake mechanism and a brake actuating mechanism. A biasing means is operable to bias the brake actuating means toward a nonactuating position with a relatively lower biasing force. The biasing means is operable to bias the brake actuating means toward an actuating position with a relatively higher biasing force.