Abstract: A pressing and driving mechanism, adapted for use in an electric screwdriver, includes a housing, an output member connected to the housing and movable relative to the housing with user intervention, a first adjustment member connected to the output member and moving along with the latter, and a second adjustment member fixed relative to the housing. The second adjustment member is adapted to be in mechanical contact with the first adjustment member. The first adjustment member moves relative to the second adjustment member when the output member moves relative to the housing, whereby the pressing and driving mechanism actively or passively outputs a continuously changing signal. The present invention can realize the function of automatically changing the output torque/speed with the pressing depth when the electric screwdriver is pressed by the user toward the wall or other workpiece.

Abstract: It may be desirable to join two surfaces of a roadway using a dowel bar retrofit. Various embodiments contemplate creating a cavity for a dowel bar using a cutting head to create a cavity with scalloped walls. The system and methods may provide for an improved structural joint.

Abstract: A handle for a work apparatus has an actuation member for controlling the rpm of a drive motor of the work apparatus. The actuation member is mounted in the handle and has a pressure surface for the fingers of a user hand. In an initial position, the actuation member protrudes with its pressure surface beyond the grip surface of the handle and, in a position for continuous operation of the motor, has dipped into the grip surface so that the pressure surface of the actuation member lies at the level of the grip surface. A recess extends in the longitudinal direction of the handle and is formed in the grip surface. The recess overlaps the pressure surface of the actuation member so that the actuation member is displaced into the handle via the recess to a boost position whereat the pressure surface lies within the grip surface.

Abstract: A power tool enabled to detect an inadvertent rotation at higher accuracy includes a first sensor that detects a first driving information corresponding to a kinetic movement state of the tool body when the tool body is rotated around a longitudinal axis of the tool bit in the event of a working operation of the power tool, a second sensor that detects a second driving information corresponding to an output torque of the tool bit driven by the motor, and a controller connected to the first sensor and the second sensor for controlling the power tool. The controller is configured to calculate holding information corresponding to a holding force of a user to hold the tool body based on the first driving information and the second driving information and control the driving of the power tool based on the holding information.

Abstract: The invention relates to an instrument for treating biological tissue, including a housing, in which is disposed a ballistic device for generating extracorporeal shock wave-like pressure waves and a transfer element permanently placed on the biological tissue, said element coupling the pressure waves into the body of living creatures, wherein the transfer element couples non-focused, ballistically generated, shock wave-like pressure waves into the biological tissue, the waves generated by a striking member that is accelerated to a high final velocity of over 5 m/s by a pneumatic medium which is under an operating pressure in a pressure channel. A quick-acting valve releases the pneumatic medium, which is under working pressure, into the pressure channel, wherein a control circuit controls the duration of opening of the valve as a function of at least one or a combination of the following parameters: working pressure, impact frequency or pressure in the back-pressure chamber.

Abstract: The tool is to be used for driving fastening members into a supporting material. It comprises a cylinder (3), with a piston (5), a combustion chamber (1, 11), a cylinder head (12) bearing a fuel igniting means (36) in the chamber (1), a pin guide (9), for receiving a fastening member and the piston (5) shaft (7) and a cage (21). Return means are provided for opening the chamber (11), driving the pin guide (9) forwardly, opening and closing abutment means for the chamber (11). There are provided: one single central spring (32) for opening the chamber (11) and, on each side of the tool, one single opening and closing side chamber abutment (18, 55), integral with the chamber (11) and mobile in translation on the corresponding side of the cylinder (3).

Abstract: A power tool including a power base and a tool head. The power base includes a trigger and a motor such that the trigger actuatable to drive the motor. The tool head is driven by the motor, and includes a lockout mechanism that inhibits actuation of the trigger in a locked. The lockout mechanism is manually rotatable from the locked position to an unlocked position in which the trigger is actuatable to drive the motor.

Abstract: A power tool including a power tool body, a rotatable driven member operable for releasably gripping a working element and having a front end and a rear end, the driven member extending from the rear end, located proximally and connected to the power tool body, and terminating at the front end. The power tool has a drive mode in which rotation of the driven member drives the working element and an adjustment mode in which rotation of the driven member causes the driven member to either grip the working element or release the working element or both. The power tool also includes a guard extending over the driven member from the power tool body and terminating adjacent to the front end of the driven member, wherein at least in the power tool drive mode the front end of driven member does not extend beyond the guard.

Abstract: A power tool includes a housing, an output member that rotates about a longitudinal axis, and a motor drivably connected to the output member. A rotational motion sensor is arranged in the housing and operable to detect a user input that includes a rotational motion of the housing in a desired rotational direction about the longitudinal axis of the output member. A controller is configured to receive a first input indicative of a user-desired rotational motion of the output member, and a second input, from the rotational motion sensor, indicative of an actual rotational motion of the power tool. The controller determines a user-desired rotational direction of the output member about the axis from the first input, determines an actual rotational direction of the housing about the axis from the second input, and causes the motor to drive the output member to simulate ratcheting movement in the user-desired rotational direction.

Abstract: A power tool comprising a hollow pole, a prime mover disposed at one end of the pole, a tool disposed at the other end of the pole, a transmission shaft rotatably disposed within the pole and configured to transmit torque from the prime mover to the tool, a joint mechanism configured to support the tool such that the tool is capable of rotating with respect to the pole, a lock mechanism configured to selectively lock and unlock the joint mechanism, and a clutch mechanism disposed on a pathway of torque transmission from the prime mover to the tool via the transmission shaft, and configured to selectively connect and disconnect the pathway of torque transmission. The lock and clutch mechanisms are coupled with each other such that the clutch mechanism disconnects the pathway of torque transmission when the lock mechanism unlocks the joint mechanism.

Abstract: A handle assembly for operating an articulatable surgical instrument is provided and includes a housing; an actuation shaft translatably and rotatably supported in the housing; a first trigger supported on the housing and connected to the actuation shaft, the first trigger being configured to translate the actuation shaft to operate a first function of the surgical instrument; a second trigger supported on the housing and connected to the actuation shaft, the second trigger being configured to rotate the actuation shaft to operate a second function of the surgical instrument; and a second-trigger release supported in the housing, the second-trigger release having a first position blocking actuation of the second trigger and a second position permitting actuation of the second trigger, where the second-trigger release is actuated from the first position to the second position upon and complete actuation of the first trigger.

Abstract: A handheld power tool has a tool holder for holding a tool, and a grip housing for holding and guiding the handheld power tool. A relative motion of the tool holder and the grip housing can be transmitted as a switching motion to a microswitch, which switches a drive unit on and off. The tool holder and the grip housing can be moved relative to one another in a direction of rotation, and the switching motion thus comprises a rotary motion of the grip housing.

Abstract: An improved method is provided for operating a power tool. The method includes: monitoring rotational motion of the power tool about an axis using a rotational motion sensor disposed in the power tool; determining a direction of the rotational motion about the axis; and driving the output member in a direction defined by the detected rotational motion of the tool, where the output member is driven by a motor residing in the power tool. Thus, the output member is drive clockwise when the rotational motion of the tool is clockwise about the axis and the output member is drive counter-clockwise when the rotational motion of the tool is counter-clockwise about the axis.

Abstract: A hand-guided apparatus may include an operating lever, a switch, and an intermediate lever. The operating lever may actuate a function of the hand-guided apparatus, be constructed in an elongated manner and be pivotably attached to a housing of the apparatus. The switch actuates the function and is arranged in the housing. The intermediate lever mechanically actuates the switch. The operating lever includes a safety element enabled to be pretensioned and shifted along a longitudinal axis of the operating lever. The operating lever and the intermediate lever are enabled to be mechanically coupled by shifting the safety element into a pretensioned state to enable actuation of the switch by pivoting of the operating lever. The operating lever and the intermediate lever are enabled to be mechanically decoupled by shifting the safety element into a relaxed state to prevent actuation of the switch by pivoting of the operating lever.

Abstract: A tacker includes a first arm pivotably connected to the body by a first pin and a second arm is pivotably connected to the body by a second pin. The first end of the second arm is movable along the underside of the first arm. A shaft is connected to the second end of the second arm and between two hook plates which are detachably hooked to a resilient plate which is connected with a push plate. The first arm is pivoted downward about the first pin while the second arm is pushed by the first arm and pivoted about the second pin. The hook plates lift the resilient plate, and are then disengaged from the resilient plate to release the push plate to eject staples. The first and second arms respectively perform two different leverage actions to save the users' efforts.

Abstract: A hand-held power tool includes a tool housing and a handle housing. The handle housing is movable relative to the tool housing. The hand-held power tool also includes an electric motor for driving the hand-held power tool. The electric motor is switched on and off by a relative movement of the handle housing relative to the tool housing. The hand-held power tool also includes a main electrical switch configured to apply an electrical voltage supply to the electric motor. The main electrical switch is switched by an actuating mechanism. The main electrical switch is actuatable with the aid of a movable component that is movable relative to the tool housing handily via the actuating mechanism, either directly or by the actuating mechanism.

Abstract: The present invention is an articulating hand power tool with a main housing having a longitudinal axis, a head portion rotatably engaged with the main housing for placement at a plurality of angles with respect to the longitudinal axis of the main housing, an integrated circuit board located within the main housing and at least one controller accessible from outside of the main housing for controlling the integrated circuit board.

Abstract: A power tool includes a tool housing, an electric motor inside the housing, and a power interface facilitating a connection to a power source. At least four actively-controlled power components are configured as an H-bridge to modulate a supply of power from the power interface to the electric motor. A user-actuated input unit outputs a first signal indicative of a desired power output level to the electric motor and a second signal indicative of a desired direction of current flow to the electric motor. A control unit controls the supply of power to the electric motor using two of said power components with synchronous rectification for pulse-width modulation (PWM) of the supply of power based on the first signal, and to control the direction of current flow to the electric motor using the other two of said power components based on the second signal.

Abstract: An electronic power apparatus includes a housing, a pair of input power pins, a pair of output power pins, power components arranged to modulate a supply of power from the input power pins to the output power pins, and a user-actuated input unit providing an analog signal indicative of a desired power output level of the output power pins. A control unit of the electronic power apparatus receives the analog signal from the user-actuated input unit. The control unit includes a controller to control a switching operation of the power components based on the analog signal, and an input detection unit to generate an ON/OFF signal to turn on the controller based detection of a prescribed change in the analog signal indicative of an initial actuation of the user-actuation unit.

Abstract: The pole comprises a securing end, with tool securing means and tool actuating means, a gripping end to be gripped by an operator, and telecontrolling means for telecontrolling the actuating means. The actuating means are arranged in the tool securing means to be directly controlled by the pole securing end and thus telecontrolled by the pole and its gripping end under the action of a thrust of the pole towards the support material. The pole is well adapted to sealing guns.

Abstract: The pole comprises a securing end, with device securing means and the device actuating means, a gripping end to be gripped by an operator and telecontrolling means for telecontrolling the actuating means. The actuating means are arranged in the device securing means and are directly controlled by the securing end of the pole and thus telecontrolled by the pole and its gripping end under the action of a thrust of the pole towards the support material. The device actuating means comprise safety means arranged to avoid by gravity the control of the actuating means by the securing end of the pole when the spatial position of the pole is inappropriate. The invention also relates to an anchoring device provided with the same safety means.

Abstract: An electric power tool has an electric drive motor whose speed is adjusted by means of an adjusting device. The adjusting device includes an adjusting element movably supported on the housing of the power tool. The adjusting element is associated with a strain measuring device that produces a measurement signal that is used to adjust the drive motor in response to a movement of the adjusting element.

Abstract: An improved method is provided for operating a power tool. The method includes: monitoring rotational motion of the power tool about an axis using a rotational motion sensor disposed in the power tool; determining a direction of the rotational motion about the axis; and driving the output member in a direction defined by the detected rotational motion of the tool, where the output member is driven by a motor residing in the power tool. Thus, the output member is drive clockwise when the rotational motion of the tool is clockwise about the axis and the output member is drive counter-clockwise when the rotational motion of the tool is counter-clockwise about the axis.

Abstract: An extension pole having a tool-actuating connection between a lever on the pole handle end and a tool on the pole distal end that remains operational by action of a lever on the pole proximal end through pole adjustment. A quick release mechanism on the pole distal end receives a tool matching that mechanism through which the movement of the lever is communicated to the tool causing the tool to operate in its normal function.

Abstract: A power tool including a power tool body, a rotatable driven member being operable for releasably gripping a working element and having a front end and a rear end, the driven member extending from the rear end, located proximally and connected to the power tool body, and terminating at the front end. The power tool has a drive mode in which rotation of the driven member drives the working element relative to the power tool body and an adjustment mode in which rotation of the driven member causes the driven member to either grip the working element or release the working element or both. The power tool also includes a guard extending over the driven member from the power tool body and terminating adjacent to the front end of the driven member, wherein at least in the power tool drive mode the front end of driven member does not extend beyond the guard. In another aspect the guard has a surface for gripping the power tool between the front end of the driven member and the power tool body.

Abstract: An implement having a drive, a drive element that may be driven by the drive and that is disposed in an axially moveable manner and is coupled to the drive element, and an overrunning clutch disposed in the drive or in a torque flux between the drive and the drive piston. If the drive has a movement that is slower than that of the drive element, the overrunning clutch is in an idle state, in which the clutch interrupts the torque flux between the drive and the drive element, thus decoupling the movement of the drive element from the drive torque of the drive. In this manner, the drive element may move more rapidly, for example during the return movement thereof, than would correspond to the movement forced by the drive.

Abstract: A power tool system includes a two-handed power tool having first and second start actuators, one for each hand of an operator. A controller prevents the power tool from initiating an operating cycle unless both actuators are turned ON to reduce the possibility of the operator's hands being disposed in a hazardous position during operation of the power tool. To discourage manual override of the dual-start-switch system, the controller prevents the power tool from initiating an additional operating cycle until both actuators have been switched OFF and then ON again. The second actuator includes a tubular sleeve that extends over part of the power tool to allow the sleeve to slide axially relative to the power tool between ON and OFF positions. Axial movement of the sleeve from its OFF position to its ON position turns ON the second start actuator.

Abstract: A rotary angle tool is provided for driving a fastener while controlling the rotational speed of the chuck by varying the pressure or force of the tool against the fastener. The tool includes an angled chuck assembly that is drivable by a motor, an output shaft of the chuck assembly having a rotational axis that is non-parallel to the rotational axis of the motor drive shaft. A sensor is responsive to the proximity of or movement of a detectable element at the chuck output shaft. The sensor generates a signal for controlling the output of the motor in response to detection of the proximity or movement of the detectable element. Moving the chuck output shaft by urging the rotary tool against a fastener varies the proximity of the detectable element relative to the sensor and the sensor output or control proportionally varies the power supplied to the motor.

Abstract: A surgical power tool has an actuation assembly which comprises a force sensor and a switch. The force sensor is provided to determine an actuation force produced by the user, and the switch is transferred by the actuation force from a first switching state to a second switching state. A combined evaluation of the force sensor signal and of the switching state enables, for example, a plausibility check for increasing the operational reliability of the power tool.

Abstract: A method and a software product for positioning a drilling unit in a rock drilling rig, and a rock drilling rig. The drilling unit (5) included in the rock drilling rig (1) is manually displaced towards a starting point (14) of a hole (19) to be drilled next. A control unit (11) in the rock drilling rig (1) performs after the manual displacement (A) an automatic positioning (B) accurately to the starting point in order to initiate drilling.

Abstract: A handle for an electric hand tool, which in use, is detachably connected to the hand tool as an auxiliary handle (2), includes at least one detection device (6), which communicates with at least one regulating and/or control element in the electric hand tool through a contactless signal transmission device.

Abstract: A power tool comprising a housing, an output shaft driven by an electric motor for driving a working piece and an adjustable handle. An elongate supporting wall of the housing extends slantwise downwardly from a rear end of the housing and houses the motor. The adjustable handle is adjustably supported by the elongate supporting wall in a secure and reliable manner whilst the whole power tool is compact.

Abstract: A power tool comprising a housing, a motor, an output shaft, a gear transmission mechanism and a control system. The gear transmission mechanism is connected between the motor and the output shaft to transmit the rotary power of the motor to the output shaft. The power tool comprises a signal generator and a control system electrically coupled to the signal generator and operatively engaged with the gear transmission mechanism such that when the signal generator is manually activated, an electric signal is generated and transmitted to the control system to cause the gear transmission mechanism to vary the gear reduction ratio.

Abstract: A rotary-percussion hand-held power tool capable of applying blows along a percussion axis (A) includes a percussion mechanism assembly (2) with a mode selection switch (3), a guide handle (4) vibrationally decoupled from the percussion mechanism assembly (2) and with a motor switch (5) for turning a power tool motor on and off, a locking switch (7) for locking the motor switch and displaceable in a switching region (X), and a switching linkage (9) displaceable by the mode selection switch (3) and having a stop (10) displaceable during a drilling operational mode into the switching region (X) of the locking switch (7), with the switching linkage (9) having two legs (16a, 16b) extending at an angle to each other, and with one of the legs (16a), which is more stiff and forms the stop (10), being pivotally supported on the percussion mechanism assembly (2), and another of the legs (16b), which extends axially and is flexural, being connected with the mode selection switch (3).

Abstract: A rotary-percussion hand-held power tool includes a vibrating percussion mechanism (2) for applying blows along a percussion axis (A), a guiding handle (4) vibrationally decoupled from the percussion mechanism (2) and provided with a motor switch (5) displaceable in switching region (X) for blocking the motor switch (5), an operational mode selection switch (3) arranged in the percussion mechanism (2), and a switching bar (9) displaceable by the operational mode selection switch (3) and having a stop (10) that projects into the switching region (X) of the locking switch (7) in the drilling operational mode.

Abstract: A drill attachment for engagement and actuation of a drill apparatus having a bifurcated frame defining a first shaft and a second shaft operatively engaged to the drill apparatus at first and second engagement points is disclosed. A handle is pivotally engaged to the first shaft and is operatively coupled to a trigger actuator located along the first shaft through a trigger cable operatively engaged to a trigger actuator the distal end of the first shaft that permits remote actuation of the drill apparatus. The trigger actuator includes a pivotable rocking arm having an actuator pad in selective engagement with the drill trigger such that actuation of the handle by the user pivots the rocking arm in a manner that causes the actuator pad to engage or disengage the drill trigger when operating the drill apparatus. A knee pad may extend from the first shaft to provide the user a contact surface for applying pressure in a lateral direction in order to abut the drill apparatus to the drill surface.

Abstract: Disclosed herein is a power device. The power device has a power source; timing circuitry powered by the power source for producing a current pulse output having a pulse width; a switch for triggering the current pulse output produced by the timing circuitry; an armature motor powered by the power source and in electrical communication with the timing circuitry for receiving the current pulse therefrom, the armature motor comprising: an electro-magnetic core; a first winding for carrying electric current to energize a magnetic field associated with the electro-magnetic core; a second winding for carrying current to reset the magnetic field associated with the electro-magnetic core, the first and second windings wound about the electro-magnetic core; and a swinging armature for providing movement in response to the energizing of the magnetic field about electro-magnetic core. The first winding and the second winding are bifilar wound together about the electro-magnetic core.

Abstract: The present invention relates to a power tool comprising a housing, an output shaft driven by an electric motor for driving a working piece and an adjustable handle. An elongate supporting wall of the housing extends slantwise downwardly from a rear end of the housing and houses the motor. The adjustable handle is adjustably supported by the elongate supporting wall in a secure and reliable manner whilst the whole power tool is compact.

Abstract: The present invention relates to a power tool comprising: a housing and a handle engaged with the housing, wherein the rear portion of the housing is provided with an arcuate track. The handle is provided with an engaging portion which is engageable with the arcuate track so that the engaging portion of said handle can slide along the track. In this manner, the position of the handle is adjustable relative to the housing. The handle is simple in construction and convenient to use.

Abstract: Disclosed herein is a power device. The power device has a power source; timing circuitry powered by the power source for producing a current pulse output having a pulse width; a switch for triggering the current pulse output produced by the timing circuitry; an armature motor powered by the power source and in electrical communication with the timing circuitry for receiving the current pulse therefrom, the armature motor comprising: an electro-magnetic core; a first winding for carrying electric current to energize a magnetic field associated with the electro-magnetic core; a second winding for carrying current to reset the magnetic field associated with the electro-magnetic core, the first and second windings wound about the electro-magnetic core; and a swinging armature for providing movement in response to the energizing of the magnetic field about electromagnetic core. The first winding and the second winding are bifilar wound together about the electro-magnetic core.

Abstract: A wholly air-controlled impact mechanism invented for creating a more compact and powerful pneumatic wrench comprises a flying hammer, a pressure impulse generator and a pressure container containing the hammer and the generator. The main part of the flying hammer is a flywheel with 2 cavities and a number of air passages. A pilot valve and an impact pin are fitted in the cavities. The impact pin rests in its cavity during energy-accumulation phase and stretches out rapidly from the flywheel to finish an impact during impact phase. The generator transmits pressure impulse periodically, affecting the differential pressure acting on the pilot valve. The higher the differential pressure, the greater the impact torque developed. The unique design of the air passages of present invention results in a very reliable, powerful and durable energy-accumulating pneumatic wrench. Its production cost is much lower due to simplicity of its configuration.

Abstract: A rock drill includes a shank. A percussion piston is arranged to hit the back end of the shank. Further, a pulling element is arranged around the shank, to which a pulling force can be directed in such a manner that the shank can, by the pulling force, be moved toward the percussion piston, when stuck drilling equipment is freed. During rock drilling, a push force is arranged to act on the pulling element, the push force being opposite with respect to the pulling force. The push force is designed in such a manner that during drilling the pulling element moves due to the push force toward the front section of the drill to be at a predefined distance from the position corresponding to the impact point of the shank.

Abstract: The invention comprises a staple gun with highly compact accessory apparatus for attaching a planar tab or label to a fixing surface. The accessory has a housing and a positioning and indexing assembly associated with the housing which is operable to feed and hold a tab or label between the staple gun head and fixing surface, thereby allowing single-handed fixing of a label or tab to a fixing surface. The apparatus can include a roller assembly, staple gun and accessory apparatus or have all components integrated into the construction of a staple gun apparatus. Preferably, the apparatus is mated with a tab or label holding magazine. Some exemplary embodiments of the invention are suitable for securing protective covering to lumber product and may be configured for rectangular polyolefin tabs measuring approximately 0.035 inch thick and 1.0 inches by 2.0 inches.

Abstract: A trigger controller for an electric power tool including a motor and a pull-trigger movable along a path having a foremost home position comprises a mechanical switch and a solid-state switch connected in series to the motor, wherein the mechanical switch includes a first moving contact, and the controller includes a second moving contact wherein the first and second moving contacts are movable to operate the mechanical and solid-state switches respectively at different predetermined travelling positions of the pull-trigger from the home position such that the two switches are caused to be initially closed at different times.

Abstract: A drive tool having a top portion which is engageable with a drive source and a lower portion engageable with a fastener. The drive tool includes an axial load assist mechanism configured to urge the lower portion and upper portion of the tool away from each other (i.e. relative movement) such that a generally axial force is applied to the fastener engaged with the lower portion of the tool. As a result, the amount of upper body axial force an operator must apply to the drive tool to install the fastener is reduced.

Abstract: A screw driving machine in which a screw having a head is screwed into a work, includes: a body; a nose section positioned toward the work with respect to the body, the nose section holding the screw to be driven; a hammering mechanism accommodated in the body, for hammering the screw into the work until the head of the screw held above the work; a screwing mechanism for screwing the screw hammered into the work; a contact arm slidable with respect to the nose section, the contact arm being pulled in toward the body when the contact arm is pushed against the work; and a locking mechanism for prohibiting the contact arm from sliding in its half way when the contact arm is pushed against the work, and for releasing the contact arm from locking after the hammering mechanism hammers the screw into the work.

Abstract: A moling apparatus comprises a housing having a head for penetrating ground, an anvil in the housing connected to the head, and a hammer in the housing and spaced therefrom by a spring. A vibrator unit is spaced from the hammer and arranged to transfer vibration to the housing and the hammer. In a first mode of the apparatus, vibration transmitted to the housing causes fluidization of the surrounding ground to allow progressive penetration of the apparatus. In a second mode, the braking effect of the ground on the head causes the hammer to move against the spring and impact the anvil thereby driving the head through the ground, the apparatus being operable at or between each mode.

Abstract: Ratchet operated device for setting a post having a helical auger thread disposed at one end. The ratchet operated device has an annular sleeve with an annular series of teeth disposed on its exterior surface. The annular sleeve is provided with a fastener for securing the annular sleeve to the post. A collar coaxially fits over the annular sleeve such that it circumscribes the annular series of teeth. Attached to the collar is a handle, preferably one that is removable to facilitate transporting and storing. Radially extending through the collar is a bore in which there is disposed a ratchet mechanism. The ratchet mechanism has a pawl which is biased to engage the annular series of teeth. The profile of the pawl provides positive engagement of the pawl with the annular series of teeth when the collar is rotated in one direction, while providing an overrunning action when the collar is rotated in the opposite direction.

Abstract: An optical device comprising a sheet of optical fibers having different lengths so that the fiber ends are distributed uniformly over a given area. The device is mounted in a digitizer tablet above or below its electrode array. When light is pumped into the free fiber ends, a pattern of light spots are formed which can be spread out to illuminate the tablet's working surface. When driven by a light pen, a similar optical device can be used to locate the light pen for menu-picking functions.

Abstract: This invention is a machine for ventilating roof decks which, without such ventilation, entraps moisture which leads to reduced insulating capacity, deterioration and the like. This ventilating device includes a mobile carriage, an extensible lift and an impact head along with associated operating mechanisms.