Abstract: A pitot pressure sensing probe assembly is made up of individual components comprising a barrel formed with a longitudinal interior passageway and a conical end cap at its leading end. A strut that has stamped or formed sections secured together to form the strut with a compound curvature includes a neck that has a bore to receive a hub of the barrel. The end cap has a pitot port for sensing fluid pressure. The barrel includes a water trap at its leading end for trapping water and permitting it to drain through a hole in the conical end cap. The longitudinal internal passageyway carries the fluid pressure sensed by the pitot port to remote instruments. The individual components are easily formed and are secured together to make the pitot pressure sensing probe assembly.

Abstract: The invention relates to a pressure sensor with an MEM structure (micro electro mechanical structure), which has a hollow housing (8) in which a semiconductor chip (2) with a pressure-sensitive area (4) is arranged. In its interior (12) and with parts of the semiconductor chip (2), the housing is covered by a first plastic compound (15), which has a lower level of deformation than a second plastic compound (16), which partly covers the pressure-sensitive area (4) of the semiconductor chip (2).

Abstract: A temperature compensated strain gauge assembly comprises a strain gauge (10) having two or more resistor or piezoresistors (Rb) in half bridge or full bridge configuration and one or more temperatures compensating resistors or piezoresistors (Rc) connected in series with the bridge resistors or piezoresistors. The resistance of the temperature compensating resistor(s) or piezoresistor(s) is such that, as temperature changes, the compensating resistor(s) or piezoresistor(s) compensates for a change in span of the strain gauge so that, for a given load applied to the substrate, the span of the strain gauge will remain constant or substantially constant and compensate(s) the null shift of the strain gauge when the bridge resistors or piezoresistors are such as to provide a known offset at a given temperature.

Abstract: A mass fluid flow sensor for determining the amount of fluid inducted into an internal combustion engine, for example, is disclosed. The mass fluid flow sensor includes an external intake fluid temperature element which improves the accuracy of the mass fluid reading. An external cold wire element is further provided which improves response time. The mass fluid flow sensor has an improved aerodynamic design which provides a lower system pressure drop. Moreover, the sensor is smaller and lighter and has fewer parts, thus providing better manufacturability. A molded one-piece isolated jet nozzle having a hot element disposed therein is included in the fluid sampling portion. Consequently, an improved lower internal flow passage pressure drop is achieved. Additionally, an improved signal to noise ratio, as well as a larger dynamic range is an advantageous consequence of the present invention. The present invention further provides improved electromagnetic interference performance.

Abstract: The invention relates to an apparatus for the measurement of the flow speed and/or of the molar mass of gases or gas mixtures in a medical application by means of ultrasonic transit time measurement with a graduated tube and two ultrasonic transducers which can be placed into this and which are separated from the interior space of the graduated tube via membranes. In accordance with the invention, the membranes are gas impermeable and are inserted into the graduated tube such that this forms a gas impermeable tubular connection. The ultrasonic transducers connected in a reseparable manner to the graduated tube contact the membranes in a flush manner.

Abstract: The present invention is an apparatus for precisely dispensing a desired weight of a particulate material from the outlet of a material hopper. The apparatus is made up of a trap chamber for collecting an initial weight that is less than the desired weight of the particulate material. The trap chamber includes an upper surface with an inlet in communication with the hopper outlet and a lower surface including an outlet. The surface area of the inlet is smaller than the surface area of the trap chamber outlet. The invention also includes a dispensing valve having a closed position covering the trap chamber lower outlet opening and an open position uncovering the trap chamber lower outlet opening.

Abstract: A torque test device includes a body in which a rotatable member is received and an engaging end on an end of the rotatable member extends out from the body. A rod and a pushing member respectively extend from a periphery of the rotatable member. A gauge is located on a top of the body and an activation bar extends from the gauge and inserts into the body. The activation bar contacts the pushing member. A spring has an end contacting an inside of the body and the other end of the spring contacts the rod. A wrench is engaged with the engaging end and rotates the rotatable member. The pushing member pushes the activation bar and the torque is displayed on the gauge. The spring assists the rod back to its original position.

Abstract: A device measures the operating angle of a universal joint in a drive train system without any physical contact with the components of the drive train system. The drive train system can include first and second shafts that are connected together by the universal joint. The device includes a first sensor for generating a first signal that is representative of the angular orientation of the first shaft relative to the horizontal and a second sensor for generating a second signal that is representative of the angular orientation of the second shaft relative to the horizontal. Each of the first and second sensors can include a pair of non-contact sensors, such as a pair of laser distance sensors, that are mounted on a base. A controller is responsive to the first and second signals for determining the operating angle of the universal joint.

Abstract: A torque sensor is provided which consists of a magnet, an assembly of magnetic rings, and a magnetic sensor. The magnetic rings have claws arrayed thereround at regular intervals. Each of the claws of one of the rings is interposed between adjacent two of the claws of the other ring. Upon input of torque, the magnet is rotated relative to the ring assembly, thereby causing the-density of magnetic flux to change as a function of the torque which is sensed by the magnetic sensor. Each of the claws is geometrically shaped so as to increase the density of magnetic flux flowing through the ring assembly, thereby improving the sensitivity of the sensor.

Abstract: A sensor for measuring a force is provided, which sensor includes a first sealed volume, a second sealed volume, a pressure diaphragm and a force diaphragm. The pressure diaphragm has a first side and a second side, with a pressure of the first sealed volume acting on the first side, and a pressure of the second sealed volume acting on the second side. The force diaphragm is exposed to a force, and the pressure of the first volume is dependent on the force acting on the force diaphragm.

Abstract: A method and apparatus for mixing a first stream of gas with a second stream of gas is provided. The method includes introducing a first stream of gas into a first stream manifold and directing the first stream from the first stream manifold into a mixing chamber via a plurality of first stream passages flow coupled to the mixing chamber. A second stream of gas is directed into the mixing chamber via at least one second stream passage flow coupled to a first end of the mixing chamber. A combined stream is formed from the first and second streams, gradually converged, and discharged from the mixing chamber through a mixing chamber exit port.

Abstract: An arrangement for passive gas sampling of a breathing gas in a breathing system allows sampling during both inspiration and expiration. The arrangement has a tube-piece having a first connector for receiving an inspiratory gas flow, a second connector for delivering an expiratory gas flow and a third connector for delivering the inspiratory gas flow and receiving the expiratory gas flow, a first port arranged between the second connector and the third connector and connected to a measurement chamber, a second port arranged between the first connector and the third connector and connected to the measurement chamber and a third port arranged between the first connector and the second connector and connected to the measurement chamber.

Abstract: An accelerated weathering apparatus of the type used to concentrate solar radiation upon test specimens includes a frame supporting a reflecting solar concentrator disposed in opposition to a target board. A channel is connected to the target board and includes a cover to define a chamber. A fluid source is in communication with the chamber, whereby a fluid introduced into the chamber reacts with the test specimens in order to accelerate degradation of the test specimens during exposure to concentrated solar radiation. Cooling apparatus contiguous with the test specimens may also be included.

Abstract: The invention relates to an inspection probe for an internal wall of a duct, comprising at least one sensor mounted in a support adapted to be moved inside the duct whilst pressing said sensor flat against said internal wall. The support is formed by a shell which is moulded onto the sensor and comprises a body provided with a window for positioning said sensor and means for attaching said sensor flat against the internal wall of the duct, said means being integrally moulded with the body.

Abstract: The present invention relates to a starter for an engine, capable of driving the engine at a high torque at the beginning of the starting and of driving it in a high-rotation condition at the end of the starting. An inner circumferential tapered portion of a movable cam plate is pressed against an outer circumferential portion of an outer cam of a clutch so that the outer cam and an internal gear are integrated to rotate at the same speed. Thus, on the epicycle reduction principle, in an epicycle reduction gear device, a sun gear, a planetary gear and an arm portion enter an identical-rotation condition, that is, a reduction ratio 1 condition. Moreover, an outer circumferential tapered portion of the movable cam plate is pressed against a tapered portion of a housing so that the internal gear is placed into a fixed, non-rotatable condition, thereby providing an ordinary epicycle reduction to produce a high reduction ratio.

Abstract: A rotating actuator includes a shaft (24) and a mechanical stop device (23) for generating a stop to limit the rotation of the shaft in a direction of rotation. The stop device acts upon the shaft to prevent the shaft from rotating further in the direction of rotation by blocking the shaft using a stop device acting mechanically on the shaft while enabling rotation of the shaft in a direction of rotation counter to the stop with slip in a stop arrangement. The slip is configured such that movement of the shaft in the direction of rotation counter to the stop is detectable. The stop device may include two independently triggered, mechanical stop devices. One stop device acts as a stop for limiting the rotation of the shaft to the right, and the other stop device acts as a stop for limiting the rotation of the shaft to the left.

Abstract: A linear actuator useful for adjusting furniture includes a housing (1) with a reversible electric-motor (2) which, via a transmission (11, 13), drives a spindle (4) with a force absorbing bearing (16). On the spindle there is a nut (5) to which an actuation rod (86) is fixed surrounded by an outer tube (7). The actuator is with the actuation rod and a rear mounting mounted in the construction into which the actuator should be built-in. The motor housing is part of the supporting construction, as a console is fixed to this (10) with a fixing for the outer tube, spindle bearing and a rear mounting and is designed to absorb the forces occurring hereon. As the housing, as with previously known actuators, need not absorb and transfer forces, this can be made as a thin shell.

Abstract: A linear actuator realizing low generation of dust and low generation of noise and bearing a large axial load is provided. A plurality of spacers 30, - - - , each having at its both ends spherical recessed portions corresponding to curved surfaces of balls 28, - - - , are arranged between the balls 28, - - - of the guide portion of the linear actuator, and the spacers 30, - - - are connected to each other in series by belt-shaped members 31 having flexibility. On the other hand, a plurality of spacers 35, - - - , each having at its both ends spherical recessed portions corresponding to curved surfaces of balls 33, - - - for the screw shaft of a screw portion, are arranged between the balls 33, - - - in a manner separated from each other.

Abstract: The present invention relates to a feed screw driving apparatus that moves a power transmission member, which engages a feed screw, in an axial direction of the feed screw by rotationally driving the feed screw using a driving source, such as an electric motor, and also to an information recording and/or reproducing apparatus that moves a pick-up apparatus with this feed screw driving apparatus and records and/or reproduces an information signal onto or from a disc-like recording medium

Abstract: A motor vehicle transmission (1) which is outfitted with a start-up subassembly (A), a core transmission (B) as well as an output subassembly (C) which are drive-engineering connected with one another and are arranged in a transmission housing to reduce development, manufacturing and storage costs. Moreover, the start-up subassembly (A) contains a clutch, a double clutch (5) or a torque converter, while the core transmission (B) is constructed as a gear reduction transmission. The core transmission (B) disposes over at least one transmission input shaft (6, 7), a gear reduction shaft (19) as well as at least one transmission output which is not oriented coaxially toward the at least one transmission input shaft (6, 7). The output subassembly (C) contains transmission components for a front-transverse drive (41, 42, 43), for a front-longitudinal or rear-longitudinal drive (39) or for an all wheel drive (44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56).

Abstract: The invention relates to a ball screw comprising a threaded nut, a threaded spindle, supporting rolling bodies, which are provided in the form of balls rotating inside thread grooves of the threaded nut as well as of the threaded spindle, and comprising a return area for the balls. In order to considerably reduce the manufacturing costs, especially by a non-cutting fabrication of the threaded nut, and to obtain a higher power density by homogenizing the contact area percentage of the ball screw, the threaded nut is comprised of a helically wound profile material according to the invention. The invention relates to a ball screw comprising a threaded nut (2), a threaded spindle (1), supporting rolling bodies (3), which are provided in the form of balls rotating inside thread grooves (5,4) of the threaded nut (2) as well as of the threaded spindle (1), and comprising a return area (6) for the balls (3).

Abstract: The invention is an electromechanical shifting apparatus, primarily for use on a multi speed, straddle-type vehicle, but applicable to any vehicle having a transmission that shifts via a pivot shaft. The electromechanical shifting apparatus consists of six main parts: switch, switch bracket (depending on application), actuator, mounting bracket, shift linkage, and wiring harness. The electromechanical shifting apparatus attaches to the machine using various other pieces of mounting hardware, dependent on the application.

Abstract: An industrial robot, provided with a balancing cylinder, which serves as an aid to the motor for actuating an arm of the robot, which oscillates about a supporting structure. The balancing cylinder is supported in cantilever fashion by the aforesaid supporting structure by means of a single oscillating support, which defines an axis of oscillation perpendicular to the axis of the cylinder and is set on one side of the body of the balancing cylinder.

Abstract: A steering column for a motor vehicle comprises a main body having upper and lower attachment points. The lower attachment point includes at least one closed-end slot having a ramped surface. A washer having a ramped surface is engaged with the ramped surface of the slot, and a fastener extends through the slot and through the washer.

Abstract: A flexible drive cable assembly for powered adjustable pedals includes an elongate flexible casing having a unitary connector which cooperates with an end fitting to secure the casing to the end fitting and hold the casing stationary relative to the end fitting. In one embodiment, the unitary connector and the end fitting form a snap-fit connection having both an interlock and an interference fit between the casing and the end fitting to reduce vibration. In another embodiment, the casing is heat staked to the end fitting such that casing material flows into grooves to form protrusions which interlock with the end fitting and an interference fit between the casing and the end fitting to reduce vibration. In another embodiment, the unitary connector includes an elongate portion press fit into an aperture of the end fitting and a flange engaging the end fitting adjacent the aperture.

Abstract: A crossbrace, for fitting between intermediate bent sections of a motorcycle handlebar, is formed at its respective ends with a part spherical knob. It is then clamped to the bar, by means of these knobs, by two clamp portions at each end. Each clamp portion has a part spherical recess and the knob is received and clamped between these recesses. Each clamp portion also has a recess of part-circular section and the bar is received and clamped between these recesses. Each clamp portion also has one or preferably two apertures for the fasteners, such as bolts and nuts for effecting their attachment in facing and clamping disposition around the bar and the knob of the crossbrace.

Abstract: A motorcycle handlebar hand grip comprises a hollow cylindrical body having a first, open end and an opposing, second end, which may be open or closed, and an annular flange projecting radially outwards at the first, open end. In order to prolong its useful life as regards wear by a rider's hand, and also improve comfort and vibration damping, the body has an external surface which is formed with projections and which tapers from adjacent the flange to adjacent the second end. The taper is achieved by the projections progressively decreasing in height from adjacent the flange to adjacent the second end. The base area of the respective projections may also progressively decrease in size from adjacent the flange to adjacent the second end.

Abstract: A phase rotary disk motor switching module employs anchor notches located on the peripheral rim of a rotary disk mounted on a motor to couple with a retaining element to enable the rotary disk to rotate in only one direction and define a plurality of phases for the rotary disk. Every phase has a driven gear coupled with the motor for transmitting output power. Motor power may be switched to a plurality of phases of output positions to maximize utilization of a single motor.

Abstract: The pinion gears of a rotary cutterbar equipped with a parallel-series arrangement of idler gears and pinion gears includes a pinion gear support pad formed integrally with the bottom wall of the gear housing and located in close relationship to a bottom surface of the pinion gear so as to prevent the latter from moving, once bearing wear or loosening of mounting hardware has occurred, to the extent that rolling elements of a bearing arrangement supporting the pinion drive shaft are permitted to fall out into the gear housing and cause additional damage to the gearing located in the housing.

Abstract: The electromagnetic propulsion system or E.P.S. is a rocketless propulsion engine known as a spacedrive. It is rocketless in that it does not involve the expulsion of propellent. It achieves this by reusing the propellent over and over again by having it travel in a loop or circle. The propellent is propelled with the use of electromagnets. The entire propulsion system moves in the opposite direction of the accelerated propellent.

Abstract: Disclosed is a method of producing maraging steel, which includes producing a consumable electrode for vacuum remelting; and subjecting the consumable electrode to the vacuum remelting. The consumable electrode contains not less 5 ppm Mg. Disclosed is also a maraging steel containing, by mass %, at least, from more than zero to less than 10 ppm Mg, less than 10 ppm oxygen, and less than 15 ppm nitrogen. The steel contains also nitride inclusions having a maximum length of not more than 15 &mgr;m and oxide inclusions having a maximum length of not more than 20 &mgr;m. Regarding the oxide inclusions, a content rate of spinel form inclusions having a length of not less than 10 &mgr;m to a total content of the spinel form inclusions having a length of not less than 10 &mgr;m and alumina inclusions having a length of not less than 10 &mgr;m exceeds 0.33 (i.e. 33%).

Abstract: An aluminothermic reduction mixture includes aluminum powder and iron oxide formed of ferric oxide (Fe2O3) particles with a special shape and other constituent parts.

Abstract: The invention relates to a method for the production of a body made of hard metal, consisting of a hard compound A and a binder B, wherein pulverulent A and B, or an optionally precompacted article that contains A and B, are introduced into a container and the material containing A and B is compacted in order to increase the relative density (RD) to a value that is higher than 70% of the theoretical maximum density (TMD). The invention further relates to a body of hard metal comprising a hard compound A and a binder B, the mass ratio of A:B gradually changing over a cross-section of the body in order to impart to said body different mechanical properties in one zone Za or to one end (T) and hardness in one zone Zb or to another end (H). The invention also relates to the use of dynamic compaction techniques for the production of such bodies.

Abstract: A process for preparing a pure PGM (platinum group metal) from a material containing a plurality of PGM compounds, wherein the PGM is selected from the group consisting of Pt, Pd, Os, Ir, Ru, Rh and Re, and the process includes initially forming the PGM in activated form by reduction of PGM ions in aqueous solution at pH 6-8 by a reducing agent, preferably, hydrogen.

Abstract: Cellular metal foam having closed cell walls is produced by introducing gas bubbles of suitable size and at a suitable rate below the surface of an otherwise non-stirred or non-agitated molten metal bath. For example, aluminum-silicon alloy, including silicon carbide foam stabilization particles has been thus processed into cellular metal of, as low as, one to two percent relative density and with good cell walls and quite regular cell size.

Abstract: A process for treating a raw steel industry slag, for converting same into a hydraulic binder at least equivalent to a Portland cement clinker, comprising:

Abstract: A method is provided for producing a cutting tool such as a twist drill, end mill or the like. The method includes the steps of providing an unbonded assembly comprising a cylindrical core (10) having ends (12, 14) and an elongate side surface (16) covered partially or completely by a coherent, unsintered layer (18) comprising ultra-hard abrasive particles for producing an ultra-hard material, subjecting the unbonded assembly to elevated temperature and pressure conditions at which the ultra-hard abrasive is crystallographically stable, recovering the sintered product which comprises a cylindrical core (10) and a layer of ultra-hard abrasive material bonded to the core and working the sintered product to produce one or more cutting edges in the layer of ultra-hard abrasive material.

Abstract: A double-ended ratchet, or socket, wrench with (1) an elongate body has (2) a rotatable turning head at each end of the elongate body, and (3) a mechanism within the body for mechanically linking rotation of each turning head to the other. Each, and either, turning head may be (2a) a cylindrical body typically with a square or twelve-point interior aperture, or (2b) a square spindle, each presenting at its exterior surface (2c) sprocket teeth. The (3) rotational linkage mechanism can be any of (3a) a continuous loop chain, (3b) a train of intermeshing gears, or (3b) a drive shaft, each engaging the exterior surface (2c) sprocket teeth of each (2) turning head so as to link rotation of each (2) turning head to the other. In use one end of the tool is directly or indirectly mounted to an object that is desired to be rotated and/or torqued, normally in tight confines.

Abstract: A shallow-well socket suitably driven by the drive post of a rotary tool to apply torquing force to, and to turn, a fastener having a head of thickness H. In one embodiment the shallow-well socket has a generally tubular body of length C less than or equal to two and one-half times the thickness H of a head of a fastener that is turned by the body, C≦2.5H. A distal-end region of length D internally suitable to fit the head of the fastener, ½H≦D≦H, connects to a central region of length E serving as a back wall to a distal-end cavity 0≦E≦½H, connects to a proximal-end region of length F internally suitable to fit over the drive post of a rotary tool, ½H≦F≦H. D+E+F=C.

Abstract: A double-ended ratchet, or socket, wrench with (1) an elongate body has (2) a rotatable turning head at each end of the elongate body, and (3) a mechanism within the body for mechanically linking at a non-unitary ratio both rotation, and torque, of each turning head to the other. Each, and either, turning head may be (2a) a cylindrical body typically with a square or twelve-point interior aperture, or (2b) a square spindle, each presenting at its exterior surface (2c) sprocket teeth. The (3) rotational linkage mechanism can be any of (3a) a continuous loop chain, (3b) a train of intermeshing gears, or (3b) a drive shaft, each engaging the exterior surface (2c) sprocket teeth of each (2) turning head so as to link rotation, and torque, of each (2) turning head to the other. Depending upon the non-unitary drive ratio, and end-to-end orientation of the tool, either torque may be magnified at the expense of drive speed, or drive speed may be magnified, as in a speed wrench, at the expense of torquing force.

Abstract: A wrench includes a body with an engaging ring rotatably engaged with a hole defined in a head of the body and a plurality of wedge-shaped gaps are defined between an inside of the head and the outer periphery of the engaging ring. A resilient member and a roller are engaged in each gap. An imaginary line “cs” is formed from a center “s” of the roller to a center “c” of the hole. Each roller applies a force at point “a” in the hole of the wrench. An off-set distance “h” is defined between the line “cs” and line “ca”. An angle “w1” defined between the line “cs” and line “ca” is in the range of 5 to 20 degrees.

Abstract: A D-shaped headed ratchet wrench structure, comprising a drive head, a D-shaped head, an operation bar, a pawl member, a control ring, a direction control disk, an elastic member, and a C-shaped snap ring. Thus, the mounting end of the D-shaped head has a size different from that of the operation head of the operation bar, so that the mounting end of the D-shaped head and the operation head of the operation bar may be used to operate sockets having different sizes.

Abstract: A ratcheting wrench includes a handle, a head extending from an end of the handle and having a hole communicated with a compartment in the end of the handle, a drive member rotatably mounted in the hole of the head, and a ratcheting mechanism. The drive member includes an inner periphery for securely holding a fastener-driving member, allowing joint rotation when the drive member is turned. The drive member further includes a flange formed on an end of an outer periphery thereof and located outside the head for manual rotation of the drive member. The ratcheting mechanism is mounted in the compartment of the handle and engaged with the teeth of the drive member, allowing the handle to selectively move in a ratcheting direction for tightening/loosening a fastener and in a free turning direction reverse to the ratcheting direction in which the fastener is not turned.

Abstract: A ratchet socket includes a socket body having an end formed with a mounting hole. The mounting hole has an inner wall formed with twelve resting protrusions and twelve chambers located between the twelve resting protrusions. Thus, by provision of the twelve resting protrusions and the twelve chambers of the ratchet socket, the ratchet socket can be used to operate a special screw, such as the gear-shaped screw, the ratchet screw, the star-shaped screw or the like, thereby greatly enhancing the versatility of the ratchet socket.

Abstract: A tool extension with a screw attraction structure includes an extension rod, an adjusting sleeve, a retaining ring, and a magnetic member. Thus, the screw may be attracted by the magnetic member in the extension rod, so that the extension rod may be used to rotate and lock the screw automatically without having to hold the screw manually, thereby facilitating the user operating the screw, and thereby enhancing the safety of usage. In addition, the limit of movement of the screwdriver head and the locking limit of the screw may be determined by adjusting the relative position between the adjusting sleeve and the mounting head of the extension rod.

Abstract: A wrench includes two jaws extending from an end of a handle and a hole is defined in one of the jaws. The hole communicates with a clamping surface of the jaw having the hole and a magnet is received in the hole. The magnet attracts the object that is clamped by the wrench while in use.

Abstract: A crimping tool includes a crimping drum that is rotatably supported within a housing for displacement between a plurality of crimping positions, thereby to position a selected one of a plurality of crimping dies opposite a window through which the bare end of an insulated conductor is introduced, characterized by the provision of a first drum locking arrangement that connects the drum to the housing via a die selecting wheel that is non-rotatably connected with the drum. A second retaining arrangement is operable to lock the other end of the crimping drum to the housing.

Abstract: A screwdriver handle includes a front shank and a rear shank combined with each other. The receiving seat of the rear shank is formed with a plurality of receiving holes for receiving multiple screwdriver heads and sockets, thereby enhancing the storage space of the screwdriver handle. In addition, when one of the plurality of receiving holes of the rear shank aligns with the push block, the screwdriver head or the socket received in the respective receiving hole is pushed upward by the push block, thereby facilitating the user taking and using the screwdriver head or the socket. Further, the slideway of the rear shank has two closed ends to limit detachment of the guide rail of the front shank, thereby preventing the rear shank from detaching from the front shank.

Abstract: Screwdriver structure including: a handle having a projecting section at rear end, a circumference of the projecting section being formed with a predetermined number of holes extending into the interior of the projecting section; a stem disposed at front end of the handle; and a rotary cap having a cavity inward extending from a bottom end of the rotary cap, an outer circumference of the rotary cap being formed with several through holes communicating with the cavity. The rotary cap is rotatably disposed on the projecting section which is accommodated in the cavity with the through holes corresponding with the holes. When operating the screwdriver, the palm of a user's hand can attach to the rotary cap. When turning the rotary cap, at least one through holes is align with, at least one holes. A rod can be inserted through the hole and the through hole to elongate the application force arm.

Abstract: Hand tool handle with rotary cap, including: a handle having a seat section at rear end; a rotary cap having a cavity and rotatably disposed on the seat section with the seat section accommodated in the cavity; and at least one projection having a cross-sectional area smaller than that of the rotary cap or the rear end of the handle. The projection is positioned between top wall of the cavity and an end face of the seat section. The top wall of the cavity via the projection contacts with the end face of the seat section. When the rotary cap rotates on the handle, the projection serves as a support point for the rotary cap so as to facilitate rotation of the rotary cap.