Abstract: A microtome knife holder comprises a support element provided on the base connected to a microtome and at least one jaw for clamping the knife that is adjustable along a rail of the support element in the same direction as the cutting edge of the knife and releasably securable on said supporting element at a desired location. The guide means if formed of a prism rail of substantially dovetailed profile, a slotted foot portion of the holder is formed with a matching complementary profile and compressible by means of at least one screw engaging around said prism rail. Different holders, usually for different types of knives, can easily be slid on or off the rail. A quick release clamp and edge guard are also disclosed.

Abstract: A sewing machine sews a continuous zipper chain to two fabric side pieces. An adjacent severing device severs the sewn article into discrete units of a length selected by the operator. Operator observation of the severing device and sewn article is achieved by a mirror mounted between the sewing machine and the severing device.

Abstract: A microtome with a drive device is described, which has a shaft and a handwheel, arranged thereupon, with a grip. For locking the drive device, an electromagnet is firmly arranged on the housing frame of the microtome. The latter is in effective connection with an indexing ring, axially displaceable on the shaft. A control device, which is electrically connected to the electromagnet and to a sensor, controls the electromagnet in response to a signal of the sensor. The sensor triggers the signal by the position of an indexing ring arranged axially displaceably on the shaft. The said indexing ring is movable in frictional connection with a pin arranged in the grip and axially displaceable by means of a lever. The lever is actuated by seizing of the grip and the locking of the drive device is cancelled.

Abstract: A saw includes a mounting arm, a carriage mounted on the arm for linear movement in first and second directions along the arm, a saw blade mounted on the carriage for rotational movement relative to the carriage about an axis of rotation extending in a direction transverse to the linear direction of travel of the carriage, and power means adapted to rotate the saw blade about the axis of rotation of carrying out a sawing operation. A kick-preventing assembly is provided for limiting the maximum speed at which the carriage may be moved in the first direction to a predetermined speed, the kick-preventing means permitting the carriage to be moved in the first direction at any speed equal to or less than the predetermined speed while preventing the carriage from kicking along the arm in the first direction at a speed greater than the predetermined speed.

Abstract: A radial arm saw assembly (10) includes a fixed position support (12) and a power saw (22) mounted on the support (12) for reciprocating movement relative thereto. The saw (22) includes a blade (28) and a drive mechanism for powering movement of the blade (28) which forces the power saw (22) towards the user (30) thereof at a predetermined speed when controlled by the user (30). A brake mechanism (38,38',38") locks movement of the saw (22) towards the user (30) when the saw (22) moves faster than the predetermined speed.

Abstract: This invention provides a safety means for powered machinery comprising a conventional wire mesh safety glove adapted for wearing by the machine operator. The machine with which it is used has a grounded frame, an electrical motor, a control switch with the electrical motor being connected to a source of electrical energy through the control switch. A control safety circuit connects the electro conducting wire mesh safety glove and by-passes the conventional control switch for the machine which is in turn connected to the motor of the machine. The safety circuit includes a circuit breaking means, preferably a relay, whereby the relay will open and deprive the motor from electrical power whenever the wire mesh glove comes in contact with the grounded frame of the machine. An alternate form of the invention connects the wire mesh glove of the operator to the antenna of a radio transmitter worn by the operator.

Abstract: A portable power driven tool includes a body having a motor therein and a handle. The handle includes a first grip portion to be grasped by an operator in one hand and a second grip portion to be grasped by the operator in another hand. The second grip portion is disposed at a position different from the first grip portion. A switch is provided in a circuit connecting the motor with a power source. The switch can be operated by the operator at the first grip portion so as to be turned on or off for starting or stopping the motor. For preventing the motor from being started by the switch, prevention means is operable by the operator at the second grip portion.

Abstract: A blade sheath for the circular disk of a rotary slicer is a narrow strip of flexible, but abrasion resistant, material and includes a longitiudinal channel. The two sheath ends are joined by a clip and bail to form a continuous loop. When the blade is placed in the channel of the sheath and the bail and clip are in the locked position, the the cutting edge of the blade is completely covered and the the blade surface is exposed for cleaning.

Abstract: Work activated slicing machine for small edible bread substance such as bagels, buns, and rolls. Incorporated in one housing is a stationary gravity work feeding chute, work sensor at the top of the chute, and carring handle. Within the housing are two DC gear motors driving two rotary knives in the chute. A bread product placed in the top of the chute being allowed to slide toward the two rotary knives, thus breaking the sensor beam, energizing the two rotary knives and pulling the bread product through and out the front, after the product clears the machine the rotary knives stop rotating.

Abstract: A shingle ridge cap cutter utilized for cutting uniform sections from roof shingles comprising a frame along which a shingle is guided to a manually operated cutter that comprises spaced blades that are moved to sever a section of the shingle. The cutter blades are provided in spaced-apart, non parallel relationship so that a combined rectangular and trapezoidal-shaped ridge cap is made by single movement of the cutter with the roof shingle positioned so that the cutter blades are aligned with the slots along one edge of the shingle. Provision is made for operation to prevent injury to the hands of the worker.

Abstract: The disclosure herein describes an anti-kickback device for use in a wood ocessing machine. The invention is concerned with mounting, upstream of an arrangement of circular saws, a series of fingers pivotably mounted on a shaft mounted transversely of the frame. Each finger is characterized by a curved edge, facing the lumber passing by, on which is mounted a series of peripherally spaced lumber-engaging pointed elements, each element defining a different angle with respect to the pivot axis of its shaft. Each lumber-engaging element consists of a support which is removably mounted to the curved edge and a blade, preferably made of carbide material, fixed to this support.

Abstract: Rolling unit supported as a cantilever and comprising pairs of rolls (12) which are supported as cantilevers and have their axis horizontal and/or vertical, such unit (10) including a working area (13) and at the same time an area (14) for replacement and maintenance, such two areas being different and located diametrically opposite to each other at the two sides of an axis of rotation (26), the rolling unit (10) being placed between the two areas (13-14), the axis of rotation (26) being vertical or tilted.

Abstract: A web cutter for use in high speed web transport machines has a roller with a hub, two flanges and three knives supported on the hub between the flanges. In one preferred embodiment the web rides on shoulders provided on the flanges. In another embodiment, the web rides on spacers that are held in position by spring biased conically tipped pilot pins. In a third embodiment the web rides on a slotted cylinder. In all embodiments the web is brought into engagement with one of the knives directly in response to excessive tension in the web.

Abstract: A blanket with a weighted perimeter and a method of its use are disclosed herein. This blanket is used as a safety device which can prevent injury to a person cutting baling straps, that surround baled materials and that are under tension, by dampening the whiplash of the straps when cut.

Abstract: A rotary table saw for sectioning dental models having a housing with a base portion and a working table mounted on the base portion. The working table is controllably depressible so as to be moved upward and downward with respect to the base. The motor housed in the base drives a rotary blade oriented in a vertical direction. A slit in the work table permits the blade to emerge therethrough as the work table is depressed. The vacuum outlet is placed in flow communication with the surface of the work table during depression of the work table to remove saw dust from the work table. The dental model is placed on the work table with the blade hidden beneath the work table. The work table is depressed to permit emerging of the rotary blade cutting from the underside of the dental model.

Abstract: A retractable dust control hood for a rotary table saw includes a generally hollow box member which is supported for movement between a working position directly over the saw blade and a retracted position substantially above the saw blade to permit ease of handling workpieces with respect to the saw and a saw support table surface. The hood is supported from a member disposed above the table surface by parallelogram linkage and a counterbalance mechanism including a rod extending between one set of parallelogram link members and a second set of parallelogram link members. A coil spring is disposed around the rod and acts to move the parallelogram link members relative to each other to counterbalance the weight of the hood. The hood includes a transparent window and a lamp for illuminating the interior space of the hood for ease of viewing the workpiece during operation of the saw.

Abstract: A rotary table saw for sectioning dental models having a housing with a base portion and a working table mounted on the base portion. The working table is controllably depressible so as to be moved upward and downward with respect to the base. The motor housed in the base drives a rotary blade oriented in a vertical direction. A slit in the work table permits the blade to emerge therethrough as the work table is depressed. The vacuum outlet is placed in flow communication with the surface of the work table during depression of the work table to remove saw dust from the work table. The dental model is first marked and scored on the occlusal surface and then its base is placed on the work table with the blade hidden beneath the work table. The work table is depressed to permit emerging of the rotary blade cutting from the underside of the dental model.

Abstract: A die protection device that prevents the taking of fraudulent non-metered impressions from the value printing die surface of a printing member in a postage meter machine. A slug is reciprocally received within the print head of the postage meter machine such that the slug will extend beyond the diameter of the print head when the postage meter machine is inoperative, but the slug will be retracted during operation for the purpose of allowing the printing postage on an envelope. The device is particularly useful in a postage meter having a reciprocating platen.

Abstract: A saw-blade guard arrangement in a motor driven chop saw which includes a new unit pivotally mounted for movement between an upper rest position and a lower operational position. The saw unit is pivotably connected to a hinging member through a pivot shaft, and the unit includes an upper safety guard, a motor casing integral with the upper guard, a saw blade fixed to a drive shaft connected to a motor shaft, and a lower guard rotatable to a first direction for covering a part of the saw blade when the saw unit is in the upper rest position and rotatable to a second direction when the unit is moved to the lower operational position.

Abstract: An improvement is set forth in a sawing apparatus having a table supporting a workpiece, a fence for guiding the workpiece and an operator moveable electrically operated saw having a first normally biased off switch controlling application of electric power to the apparatus, the switch being positioned to be controlled by the hand of an operator which controls movement of the saw. The improvement comprises a second normally biased off switch connected in series with the first normally biased off switch, the second switch being mounted adjacent to the fence a sufficient distance from the saw blade to prevent the saw blade from contacting the operator's off hand when the off hand is activating the second switch and in a position whereat the off hand can, simultaneously with activating the second switch, adjust the position of the workpiece along the fence.

Abstract: A braking arrangement for a motor-driven chain saw is disclosed. The braking arrangement is actuable by a releasing device and is held in the release position against a spring force by means of a latching device. The braking arrangement includes a brake band holding member to which a brake band is fastened. The brake band can be tightened around a clutch drum of the motor-driven chain saw by means of an ancillary chain brake device provided in addition to the chain brake device, so that the clutch drum is brought to an immediate stop. This braking action occurs also if the releasing device of the chain brake device is not actuated. In this way, the chain brake device remains activated thereby enabling it to act during operation of the chain saw, for example, in the event that the motor-driven chain saw kicks back while the saw chain is running.

Abstract: A safety chain for a chain saw comprising drivers connected by side link units each having a pivot fulcrum on its lower edge running in contact with the saw blade kerf bottom, the side links including a cutter tooth, a depth gauge, and a safety device for the particular cutter.

Abstract: A safety device is provided for a cloth cutting machine having a motor driven cutting blade and a presser foot rod. The safety device (10) includes a housing (30) which in one embodiment serves as a magnetic concentrator. This housing (30) carries an electromagnet (40) which selectively activates a stopping mechanism (60) which secures the presser foot rod (16) at a selected location while the machine (12) is in operation. Upon termination of the cutting operation, the safety device (10) releases the presser foot rod (16) and allows the rod to slide under the force of gravity to its extended position such that the cutting blade (22) is shielded. In the preferred embodiment, a control circuit is provided for selectively energizing and de-energizing the electromagnet (40) which operates the stopping mechanism (60). This control mechanism releases the presser foot rod (16) upon termination of the machine operation.

Abstract: A cutting machine for solid bodies such as rubber tires according to the invention comprises a blade base 14 moved vertically by pressing cylinders 1. Downwardly directed cutting blades 18 are mounted on the underside of the blade base 14. These blades 18 can retractably project through slits 15a formed in a presser plate 15 positioned below the blade base 18. Rubber tires T.sub.1 placed on a receiver 27 are cut by the blades 18 with the presser plate 15 compressively retaining the tires T.sub.1. The resultant cut pieces are discharged by horizontally moving an accommodating box 22 through discharge cylinders 23. The receiver 27 is slightly rotated after a predetermined number of cutting operations.

Abstract: A powered hand tool as a housing containing an air pressure driven motor with an output spindle extending from a work side of the housing and a work device such as a grinding wheel mounted thereon. A guard is mounted with the work side of the housing and at least partially surrounds the work device or grinding wheel. A handle mounted with the housing is provided for an operator to hold the tool. An air pressure flow control valve is mounted in the handle and includes a valve actuator member extending from the handle. An actuating lever is secured to the housing by a removable lever mount located in a locking groove in the housing and held in place by a portion of the guard. With the guard in place the actuating lever mount is positioned for hand actuation upon grasping the handle.

Abstract: A motor-driven chain saw is electrically operated by means of a universal motor and has two brake systems operating independently of one another. A mechanical brake system serves as a safety brake and when actuated, the mechanical brake system brings the saw chain to a standstill instantaneously. The second brake system is an electric coasting brake, which when the switch is released stops the saw chain quickly but without recoil. The electrical braking is effected by reversing the polarity of one pole coil of the field winding and short-circuiting it with the rotor winding.

Abstract: An electro-mechanical brake in a motor saw requires electric energy for the operation of the brake. This energy can, according to the invention, be surplus energy in the ignition system of the saw. Surplus energy exists usually only when the r.p.m. exceeds a certain value. A capacitor is charged by current from the system and is prepared to discharge through a coil to actuate the brake on a signal from a kickback sensor.

Abstract: A shearing device which uses an in-line design wherein bearings are aligned with the moving blade so that lever arm forces are not produced between the movable blade and a fixed blade. This provides for highly accurate and clean cuts of printed circuit boards. The fixed lower blade is vertically oriented to provide clearance on both front and back portions for placement of tooling means to hold printed circuit boards in the shear to minimize scrap cut from the boards. Additionally, the clearance provided by the vertically oriented lower blade allows for zero space cutting of the printed circuit boards adjacent components mounted on the printed circuit boards. An optical curtain is also used which is directly aligned with the movable upper blade so that obstructions can be detected directly in the path of movement of the upper blade.

Abstract: A saw wherein an arbor is mounted to drive a circular saw blade from below a flat work surface upward through a slot in the work surface to sever any work piece suitably disposed on the work surface. A guard/clamp above the work surface is lowered to engage and clamp each such work piece on the work surface before the saw blade begins its ascent. A sensor is mounted on the guard/clamp to sense the presence of a work piece at a location immediately on the work piece feed side of the saw blade and adjacent a saw fence. The sensor prevents operation of the saw when the sensor fails to establish the presence of a work piece on the work surface.

Abstract: An improvement is set forth in a sawing apparatus having a workpiece support structure and an operator moveable electrically operated saw having a first normally biased off switch controlling application of electric power thereto, the switch being positioned to be controlled by the hand of an operator which controls movement of the saw. The improvement comprises a device adapted for gripping, positioning and clamping a workpiece relative to the workpiece support structure and a second normally biased off switch connected in series with the first normally biased off switch, the second switch being positioned to be controlled by the off hand of the operator while the off hand is utilizing the device. Since both hands of an operator must be holding onto normally off switches and since both switches are in positions removed from the area of movement of the saw blade, the operator is protected from accidently cutting himself.

Abstract: A guide member projects upwardly from the splitter, and an extension bracket is pivotally connected to the splitter and defines a guide slot for receiving the guide member. The splitter includes a leg having a projecting foot defining a notch between the foot and a bottom portion of the splitter whereby the leg may be disposed within a slot in a mounting plate so that the notch receives a portion of the mounting plate. The mounting plate includes a tab angled downwardly at one side of the slot for engaging a side of the foot.

Abstract: A household slicing machine wherein a disc shaped rotary knife is mounted in a vertical plane and a guard, which is separable from the housing of the machine, is movable in a second plane that is parallel to the vertical plane of the knife between a first position in which the guard cooperates with an adjustable abutment to conceal the knife, a second position in which the knife is exposed and the machine is ready for use, and a third position in which the guard can be detached from the housing. A spring-biased locking element is reciprocably mounted in the front wall of the housing to extend into an opening of the guard when the latter assumes its second position and to extend in front of an end face of the guard when the latter assumes its first position. This prevents accidental shifting of the guard from the selected position because each such shifting must be preceded by manual depression of the locking element.

Abstract: A cutting chain for a chain saw including a safety element normally preventing the cutter tooth from cutting wherein the safety element is mounted on the driver link and by inward pressure; i.e., toward the cutter bar, is rotated to a position under the cutter tooth so that the latter may cut.

Abstract: A cutting chain for a chain saw including a safety element in front of a cutter tooth, the safety element normally extending past the cutter tooth to inhibit cutting, but depressible by a solid object such as wood to allow cutting.

Abstract: A household slicing machine wherein a disc-shaped knife is rotatable in a vertical plane in response to starting of an electric motor as a result of depression of a trip which is mounted in the housing of the slicing machine. The trip can be depressed only when a detachable guard for the knife is held in an intermediate position in which the guard and an abutment for the foodstuff to be sliced define a gap wide enough for movement of the foodstuff into the range of the rotating knife. The guard causes a spring-biased blocking device to prevent depression of the trip when the guard is shifted to a position in which it cooperates with the abutment to prevent access to the knife as well as when the guard is actually detached or is held in a position in which it is detachable from the housing.

Abstract: A cutting chain for a chain saw including a clearer immediately in front of the cutter tooth, the clearer normally extending past the cutter tooth and preventing cutting but depressible by a solid object such as wood to allow cutting.

Abstract: An apparatus for slicing bread products or the like, provided with an oscillated driven cutting frame having parallel cutting strips, a supporting surface for the product to be cut leading to the frame, a propelling member movable across the surface and a housing enveloping the frame and propelling member, provided with a feed-in and a feed-off opening which, can be used by untrained operators or customers without any danger, in that the feed-off opening is located in the housing above the cutting frame.

Abstract: A food-cutting apparatus comprises: a longitudinal supporting frame mounted in upright position on a base; an upper frame and a cutting plate below the upper frame both of which are fixed to a front surface of the supporting frame in lateral position; a longitudinal rotary main shaft provided on the upper frame movably up and down and provided with a holding member for a work at its lower end; a worm wheel meshing with a worm formed on the main shaft; a brake ring and a handle for moving the main shaft up and down, both of which are provided on a rotary shaft of the worm wheel; a brake shoe abutting on the brake ring for controlling a rotation of the worm wheel; a cover for enclosing a cutting operation area above the cutting plate, which cover is openable horizontally; an electric motor rotatably driving the main shaft; and a main switch provided in a control circuit for the motor; which food-cutting apparatus is characterized by further comprising: a stop means having its front end engaging portion engage w

Abstract: A paper-shredding machine has a sleeve mounted for limited movement towards and away from a surface of a housing of the machine to define an inlet opening, through which paper can be fed to cutters disposed within the housing. The sleeve normally occupies a position in which the inlet opening is closed but can move relative to the housing to admit paper through the inlet opening.

Abstract: The invention is directed to a safety arrangement for a power-driven portable tool such as a motor-driven chain saw or the like. The portable tool has a housing equipped with two handles both of which are grasped by the operator to hold and guide the tool during use thereof. One of the handles is a bail handle mounted at the forward part of the housing. The safety arrangement includes two switches associated with respective ones of the handles. The switches are operatively connected to the motor so as to cause the same to be operative only when both switches are closed. At least a portion of one of the contacts of the bail handle switch is displaceable from a first position whereat the bail handle switch is open to a second position whereat the switch contacts come into mutual contact and the bail handle switch is closed.

Abstract: The invention relates to a cold meat slicing machine comprising a locking device exhibiting the following features: a slider member articulated at the carriage prevents swivel motion of the carriage at a thickness of cut setting other than zero; a bar is swivable into a first end position in which it permits swivel motion of the carriage; a claw connected to the bar locks the device for adjusting a stop plate at the zero thickness of cut setting; a supporting surface of the slider member locks the adjusting device in the zero position when the carriage is in the swivelled-out position; in the swivelled position of the carriage, rotation of the slider member, and, consequently, alteration of the zero position of the device for adjusting the stop plate are excluded.

Abstract: A slitting apparatus employing safety features and particularly suited for use in slitting strip paper as employed in a graphics drum plotter. A housing is provided which is adapted to be releasably attached to the frame of the plotter adjacent the takeup roller for the strip paper. The housing has a box-shaped top with a hinged opening rear portion. A plurality of knife blades are mounted in housings disposed in a slot in the wall of the box portion for adjustability as to their position along the width of the paper. The knife blades are spring-biased to a retracted position and adjustable actuators in the hinged portion extend the blades selectably only when the box is closed. A releasable latch is provided for holding the box in a closed position. A releasable latching assembly connects the housing to the frame of the plotter. The latching assembly is activated by opening the box which, in turn, retracts the knife blades.

Abstract: A warning and braking device for use on a power cutting tool such as a circular saw or a lawnmower comprises a generator, a drive shaft and a pulley connected by a lever to the power tool on/off switch. When the power tool is in the working "on" position, the generator assembly does not contact the power tool drive belt and no electric current is produced by the generator. When the power tool switch is shifted to the off position, however, the pulley on the generator drive shaft is brought into contact with the drive belt, exerting a braking force on the drive belt and producing an electrical signal from the generator which is connected to a warning device such as a light or a siren.

Abstract: In an automatic wire cutting machine a stepper motor driven knurled roller is positioned between two wire guide channels to drive a wire toward a cutting station. The length of wire to be cut is set in a length counter. Drive cycles, during which the wire is driven a predetermined distance, are counted in the length counter. Then, the stepping motor is disabled and cutting blade is energized. This system prevents operation of the cutting blade solenoid at less than an acceptable duty cycle with short lengths of wire. Due to the particular displacement of the wire with each step of the stepping motor, the system is readily converted from English to metric units.

Abstract: A flexible saw is disclosed, including a plurality of toothed cutting links forming a continuous loop wherein the cutting links are arranged in two side-by-side rows with the cutting links in a staggered relationship. The links of each row each have opposite ends, respectively, aligned with the opposite ends of a pair of adjacent links of the other row. Rivets pivotally connect the aligned ends of the cutting links directly to each other. The flexible loop is mounted on a guide bar. The cutting links of each row each have a cutting tooth which extends away from the links of the other row. A safety bar is located between the teeth of the two rows of links to provide protection against accidental cutting.

Abstract: A multiple gob glass shearing mechanism in which the sets of opposed shear blades are supported for movement toward and away from each other in a straight line or with parallel motion. One set of shears is mounted on a shear guide that can be adjusted up or down relative to the holder of the opposed set of shears. This adjustment is for the purpose of adjusting the tension on all the sets of blades simultaneously and can be affected when the shears are in operation. The drive for the shears may be unlatched for safety purposes when out of position and when put back into operation the shear blades will not close unless the latch is refastened.

Abstract: An impact-type wire rope cutter is disclosed in which a slotted fragment guard is movably mounted to the body of the wire rope cutter. The slotted fragment guard slidably receives the cutting chisel therethrough, and it is formed so that it can be moved between an open position for receipt of a length of wire rope and a closed position immediately over the cutting area to prevent the direct expulsion or escape of fragments which can be produced by the cutting chisel during cutting. The fragment guard can be retrofit to existing cutters and easily replaced.

Abstract: The trimming apparatus and fixture for holding a PC board prior to and during trimming of an upper surface of the PC board utilizes a trimming blade rotated by a variable speed motor. This apparatus includes X and Y motion mechanism moved by hand grips that are spaced apart and cooperate with push button switches providing a safety control circuit. The X and Y motion mechanism employs linear ball bushings mounted and movable on hardened steel shafts. Removable holding fixtures are employed to hold and retain the PC boards during trimming. One holding fixture is used for PC boards that are not warped and not likely to warp. This fixture holds the PC board on three sides and a quick acting cam clamp is actuated to retain and release a PC board. Another fixture is adapted to hold and retain a PC board that is warped or likely to warp. Vacuum is used with a plurality of standoffs to establish the desired holding plane of this PC board.

Abstract: A punch press apparatus for perforating explosive sheet material has a cur plate containing multiple tubular cutters projecting below the plate. Each cutter contains a spring biased plunger for ejecting cutout sheet material from within the tubular cutter. The rearward end of each plunger projects above the cutter plate and contains a compression spring which returns the plunger to its original position after it has ejected the cutout material. A removable plunger protector plate is positioned above the cutter plate and a plunger ejector plate is located above the protector plate. The latter contains holes for receiving the projecting plunger ends so that the plungers are not depressed when the ejector plate is moved downward to press the protector plate onto the cutter plate to perforate the sheet material against an anvil. After the perforation operation, the protector plate is removed and the ejector plate is moved downward to depress the plungers which eject the cutout sheet material from the cutters.

Abstract: A work table for use with a chain saw comprises a flat-topped work surface having a slot defined therein through part of which an elongate member of a pivotal carrier unit extends uprightly and is movable longitudinally therein. The member has in vertical spaced relation to extend from the same side thereof, parallel to and above and below the remaining part of the slot respectively a chain saw guard and a chain saw mounting bracket. The outer end of a stationary link arrangement is to engage around the throttle of a chain saw. With a chain saw fitted with its cutter bar extending upwards through the slot parallel to the member and clamped in mounting bracket, the throttle ready to be engaged and chain saw energized, movement of a workpiece to be cut against the chain saw mill move the pivotal unit with the chain saw about its pivot to cause the throttle to be depressed to activate the blade of the cutter bar.