Abstract: The portable power chiseling tool has a tool holder, an electric motor, a striking mechanism and an idle strike catcher. The tool holder can receive a tool and retain it movably on a working axis. The striking mechanism includes an exciter piston, a striker, an anvil and a guide for the anvil. The exciter piston is coupled to the electric motor. The guide guides the anvil on the working axis. The idle strike catcher for the anvil has a conical inner surface facing the anvil. The anvil has an associated end face facing in the striking direction. The end face rests against the conical inner surface when the anvil is in its forwardmost position in the striking direction. The end face of the anvil has a first segment and a second segment in the circumferential direction. The second segment is offset in the striking direction relative to the first segment.

Abstract: Embodiments disclosed herein relate to tools capable of amplifying or dampening axial forces produced by downhole equipment. More specifically, apparatus and methodologies provide a tool for imparting amplified axial loads (e.g., a hammer sub), or, in the alternative, for dampening/reducing downhole vibrations or “noise” (e.g., a suppressor sub).

Abstract: A device for to aid or help patients remove dental prostheses. The dental prosthesis removal tool preferably includes a small hook, which has a rubber cover. The hook is preferably attached to a bar and a handle, which could easily fit into a patient's hand. The tool is preferably made of a strong, rust free metal, e.g. stainless steel. The handle is preferably made of a hard, processed plastic, and is strongly secured to the bar. A kit of the components is also envisioned.

Abstract: An apparatus (1) with a reciprocating component (3) fitted with composite cushioning slides (13) on an exterior surface (8, 9). The reciprocating component (3) is movable along a reciprocation path and the composite cushioning slide (13) includes an exterior first layer (14) and an interior second layer (15). The first layer (14) is formed with an exterior surface (16) configured and orientated to come into sliding contact with a containment surface (7) of the apparatus (1) during the reciprocating movement of the reciprocating component (3), the first layer (14) is formed from a material of predetermined friction and/or abrasion resistance properties. The interior second layer (15) is located between the first layer (14) and reciprocating component (3) and is formed from a shock-absorbing material having predetermined shock absorbing properties.

Abstract: A pneumatic post driving apparatus comprises an internal cylinder chamber within which a hammer piston is reciprocated. The hammer piston strikes against an anvil, which in use is abutted against the top of a post to be driven. Kinetic energy from the descending hammer piston is transferred through the anvil into driving energy for the post. An air control system alternately routes pressurized air between the top and bottom ends of the cylinder to move the hammer piston up and down. The air control system includes a spool-type control valve disposed for sliding movement within a control body. The anvil is resiliently suspended at the bottom of the cylinder chamber by an annular retention flange that has a conically tapered under surface. A lower elastomeric pad fits against the tapered under surface of the retention flange in direct surface-to-surface contact.

Abstract: A hydraulic pole tamper with an extended ergonomic handle including a frame and hose clamps to extend the life of the hose by securing the hoses to the frame and to improve the handle, orientation, and usability of the pole tamper. The pole tamper is used to tamp or compact the dirt around a pole which has been set into a hole in the ground to fixedly secure the pole vertically in the ground.

Abstract: The present invention discloses a pneumatic nail gun, which comprises a nail tool body, a cylinder seat arranged above the nail tool body, a housing cap arranged at top end of the cylinder seat; a seal gasket is arranged inside top of the housing cap; a head valve is arranged inside the housing cap, and a spring is disposed inside the head valve; a collar is actively arranged inside the cylinder seat, a cylinder being disposed inside the cavity of the tool body; the collar can move reciprocally along a space formed between the cylinder seat and the inner step surface of the cylinder; a control valve assembly is arranged along a radical direction of the cylinder seat; a piston driver assembly is actively arranged inside a chamber being formed by an inner hole of the collar and an inner hole of the cylinder. The pneumatic nail gun can reduce the pressure oscillation when firing, increase the effectiveness of the firing for every time.

Abstract: A pile driver provided with a housing and at least one body connected with the housing so as to be moved back and forth over a predetermined path, the pile driver being further provided with a drive for moving the body back and forth over the path for the purpose of pile-driving, the pile driver comprising at least two parts movable relative to each other, respectively having at least a first type of sliding surface and at least a second type of sliding surface which during pile-driving slide along each other and between which there is a lubricant, wherein the first type of sliding surface is provided with polyether ether ketone.

Abstract: A drive mechanism for a hammer drill comprises a hollow piston 558 having a cylindrical bearing that is adapted to receive a crank pin in order to cause the hollow piston 558 to reciprocate inside a spindle 548. A plurality of longitudinal ridges 559 are formed on the outer surface of the hollow piston 558 to reduce the surface area of contact between the hollow piston 558 and the spindle 548, and a plurality of grooves 561 are formed in the gaps between the ridges. The grooves 561 are adapted to retain lubricant 563 in order to reduce frictional contact between the hollow piston 558 and the spindle 548.

Abstract: A method for operating a driving tool that can be employed for driving fasteners, such as nails.

Abstract: An automatic reduction-ratio changing apparatus comprises a planetary gear mechanism including a sun gear, planet gears, and an internal gear. When a load, which exceeds a predetermined torque, is applied to the internal gear, a pawl of a lock lever is engaged with a ratchet section of a housing to stop the rotation of the internal gear and lock the internal gear. When a displaceable member of an actuator is displaced from an outward route to a homeward route, the rotation of a motor is reversed, and an input shaft and a cam are rotated in a reverse direction to release from the locked state. Accordingly, the speed reduction ratio, which is transmitted from an output shaft to the actuator, is automatically switched.

Abstract: The subject invention pertains to an improved air-operated hammer which can utilize a pressurized air reservoir located near a pressurized air entrance of the hammer. This pressurized air reservoir can continue to receive pressurized air even when the hammerhead is failing and, preferably, can enable pressurized, air to enter the hammer at, a faster rate than the hammer's external compressed-air source can supply. The subject invention can utilize a compressed-air source with a lower flow rate and/or lower pressure in comparison with a typical air-operated hammer, in order to achieve the same hammer performance. Alternatively, the subject invention can utilize an equivalent compressed-air source in comparison with a typical air-operated hammer, in order to achieve superior hammer performance, for example shorter time periods to raise the hammer head leading to move hammer drops per time.

Abstract: A tubular piling driving apparatus and a method of securing a tubular piling into the bottom of a body of water using the apparatus. The apparatus is pressurized fluid-actuated, preferably pneumatic, and is positionable substantially within an upper end of a tubular piling to be secured into the bottom. The weight of the entire apparatus acts upon the upper end of the piling through a collar fitted onto the upper piling end. One or more additional weights are supported at the upper end of the axially movable shaft of the apparatus which increase both downward static and inertia forces transmitted through the collar to effect piling installation as the shaft repeatedly raises and drops the weights against the upper end of the tubular piling through the collar.

Abstract: A hand drill including a housing (2), a rotary drive (8-15) arranged in the housing (2) for driving a chuck (6) provided at a front, in the drilling direction, end of the housing and in which a drill or a chisel tool is received, a compressed air-operated hammer mechanism having a pneumatic cylinder (22), a die member (15) for imparting axial blows to the drill or chisel tool, and a percussion piston (30) displaceable in the pneumatic cylinder 922) upon being impinged by compressed air for intermittently applying axial blows to the die member (15), and a reversing valve for connecting the hammer mechanism (22) with a source of compressed air, integrated in the percussion piston (30), and having a plurality of recesses and bores (46-52) alternatively operationally connectable with at least one inlet opening (23) and at least one discharge opening (24) of the pneumatic cylinder (22) for feeding the compressed air into the pneumatic cylinder (22) and for discharging the compressed air therefrom.

Abstract: A pneumatic fastener driving device includes an energy control assembly constructed and arranged with respect to a passageway leading to a piston pressure chamber to be manually movable between (1) a first position wherein the passageway is opened fully to communicate a pressure reservoir with the piston pressure chamber thereby permitting the air under pressure to communicate with the piston pressure chamber to provide maximum energy to a drive piston and (2) a second position wherein the passageway is at least partially closed restricting a flow of the air under pressure from the pressure reservoir to the piston pressure chamber thereby reducing energy to the piston while the air under pressure is maintained at a predetermined pressure value.

Abstract: A fluid pressure operated nailer is provided including a portable housing having a fixed generally longitudinally extending chamber axis, a fluid pressure actuated mechanism mounted in the housing for movement through successive operative cycles. The nailer includes an elongated nail driving element having a nail engaging end, an opposite end and a longitudinal driver axis extending therebetween. A housing nosepiece is provided which includes surfaces defining a leading nail containing space wherein a nail axis of the leading nail is laterally spaced with respect to the fixed chamber axis. The nosepiece includes surfaces defining a nail feed track extending to the leading nail containing space for guiding a releasably interconnected supply of nails engaged therewith along the nail feed track for generally longitudinal movement therefrom.

Abstract: A pneumatic operated fastener driving device having an improved piston, which together with the cylinder form an elastic interference fit connection so that the piston is held from movement until a sufficient air pressure is applied to the piston. The piston has little or no frictional resistance with the inner surface of the cylinder during the driving or return stroke.

Abstract: A piston and a fastener driving element connection including interengaging threads on the piston and fastener driving element and a thermoplastic locking compound between the interengaging threads. The connection being adjustable by following a method comprising the steps of heating the threaded connection sufficient to soften the thermoplastic locking compound, effecting a relative turning movement between the fastener driving element and piston while the thermoplastic locking compound is softened to an extent sufficient to bring the fastener driving element and piston into the desired position of adjustment, and then allowing the softened thermoplastic locking compound to harden.

Abstract: A percussion tool utilizing a reciprocatory piston movement for applying an impact force on to a working surface including a casing (1) having disposed axially therein a hammer member (12), an anvil (5) impacted by the hammer member and a chisel point (4) supported by the anvil. A spool valve (18) is located within the interior of the hammer member for reciprocatory movement in unison with the hammer member, the control the flow of a pressurized working fluid supplied to the hammer member, to thereby cyclically move the hammer member in reciprocatory movement.

Abstract: A power tool, particularly a hand-held power tool, has a striking mechanism with a striker transmitting impact energy to a tool, a drive operative for actuating the striker through an air cushion, and a heat insulating element which is associated with the striker and insulates the same from heat generated in the air cushion during the operation of the power tool. The heat insulating element may simultaneously be formed as a mechanical buffer.

Abstract: An improved piston and driver structure includes a synthetic piston body, a bifurcated piston insert and a driver secured within the insert by means of a pin and by means of frictional engagement of the driver by the piston insert when the insert is assembled to the piston body. The piston insert has an enlarged top for dissipating operating pressures over the piston body.

Abstract: A compressed-air pile-driver, especially for axially insertable tools, including a ram arranged in a housing. The interior of the housing is divided by the ram respectively into an upper compression or expansion chamber and a lower compression or expansion chamber, which can each be alternately connected to a compressed-air source via air connection pipes and a control valve, with each having an air-outlet orifice opened alternately by the ram. In the upper expansion chamber, a pressure chamber, into which the upper air connection pipe of the upper expansion chamber opens, is divided off by an intermediate plate which is approximately parallel to the end face of the ram. Located in the intermediate plate is at least one orifice which connects the pressure chamber to the upper expansion chamber, and which is closed in a leak-proof manner by the ram in its upper dead-center position, the ram additionally being retained firmly in its upper dead-center position by a retaining device.

Abstract: A pneumatic gun for forcibly inserting fixing elements, such as nails, metal staples and the like. The gun has an operating piston, carrying an arm for firing the fixing elements. The arm slides in a cylinder open at one extremity towards a compressed air tank provided in the stock of the gun. The operating piston is moved by a control piston located above the open extremity which, in turn, is operated by a valve, which is actuated by the trigger of the gun and is movable between two extreme positions. The gun is equipped with an efficient safety device and is so constructed that no torsional stress is applied to the compressed air infeed duct; and so that it can be easily locked onto a suitable support.

Abstract: A fluid operated ram comprises a striker body guided in an upright housing between an active stroke and a return stroke and striking at the end of its active stroke an impact transmitter resting on a member to be driven into the ground by the ram. The striker body is connected by a piston rod to a working piston reciprocatedly arranged in a cylinder coaxially mounted on the upper end of the housing, so that the striker body is driven during reciprocation of the working piston. The working piston is a differential piston and divides the cylinder into a first chamber above the upper larger face of the working piston and a second chamber below the smaller annular face of the differential piston.

Abstract: The hammer of an underwater pile driving apparatus is movable upwards and downwards in a housing which, in operation, is filled with a liquid which is present both above and below the hammer, the hammer being driven at least on the upwards direction by a driving liquid which is pressurized by a motor driven pump located on or adjacent the housing and which is the same as the liquid in which the hammer moves.

Abstract: A vehicle-supported post-hole driver comprises a frame adapted to be mounted on the pivot of the vehicle drawbar. It is supported in a fore-and-aft position by a fluid cylinder connected between the frame and the support vehicle, the fluid cylinder providing for fore-and-aft movement of the outboard end of the frame. A second fluid cylinder pivots the frame about the drawbar pivot thereby transversely positioning the outboard end of the frame. The outboard end of the frame supports a pivotally-mounted yoke into which a pivotally-mounted vertical guide bearing is positioned. The combination of the pivoted yoke and the pivoted guide bearing provides a gimbaled arrangement. Slideably positioned in the guide bearing is a vertical shaft to which is attached a drive hammer and post-hole bit assembly. The drive hammer is raised relative to the post-hole bit by means of a fluid cylinder mounted within the bit and connected to the drive hammer. It drops gravitationally and drives the bit into the ground.

Abstract: An underwater hammer, of the gas discharge type, is provided with a surrounding casing arranged in the nature of a diving bell from which liquid can be purged so that the hammer ram may move up and down with minimum resistance. A reflood tube extends down through the upper end of the casing and opens into an axial reflood passageway in the ram and liquid is pumped through this tube to obtain reflooding after each cycle of operation.

Abstract: An improved driver is provided wherein a pneumatically operated piston is slidably disposed in a cylinder which is adapted to vent to atmosphere through a port positioned adjacent the end wall of the cylinder. A piston cushion, anchored to the interior surface of the cylinder end wall, is configured to provide communication between the port and the air trapped under the piston when the latter makes contact with the cushion, as well as to avoid piston flexing when struck by the piston. The cylinder end wall is removable to provide access to the interior of the cylinder. A hammer, in the form of a shaft, is removably affixed to the piston in a manner that precludes leakage through the piston and extends through the cushion and the cylinder end wall. Sealing means which are accessible from the interior surface of the end wall provide sealing contact between the latter and the hammer.

Abstract: A drop hammer has a hydraulic cylinder and piston assembly with a hammer weight attached to the piston and a sleeve valve at the lower end of the cylinder coaxial with the cylinder. An outer casing surrounds the cylinder, forming an annular passage from the valve to the upper end of the cylinder. Through servo control means that may be automatically operated by the hammer movement, the valve alternately admits pressure to the cylinder space below the piston to raise the weight, and opens said cylinder space to the annular passage to put both ends of the cylinder in communication and allow the hammer weight to fall.

Abstract: An underwater hammer, of the gas discharge type, is provided with a circumferential control valve on the hammer ram to allow free flow of water and gas upwardly along the ram in the annular clearance between the ram and a tubular sleeve in which it is guided, but to interrupt the flow of water downwardly along the ram. The control valve allows the region under the ram to be purged of water when the ram is driven upwardly in the sleeve and it prevents water thereafter from flowing back down under the ram where it would otherwise cushion ram impact on an anvil.

Abstract: A ram device has a drop hammer connected to the piston of a lifting cylinder which is connected by means of short and wide ducts to a control apparatus for admitting compressed air into the cylinder and for discharging the air from the cylinder beneath the piston, control apparatus directly communicating with the ambient air so as to allow a rapid escape of the air through large air vent ports from beneath the piston. In particular this control apparatus is directly mounted on the cylinder, or is included in an extension of this cylinder.

Abstract: The pile-driving arrangement can drive piles both above and below water. It includes a housing containing a gas-filled motion chamber and an impact body movable upward and downward in the motion chamber. A cylinder-and-piston mover includes a cylinder part and a piston part, one part connected with the housing and the other with the impact body, for effecting relative movement between the impact body and the housing. A drive unit on the housing includes a drive motor, a pump driven by the motor and a pressure fluid tank. The drive unit is connected with the housing for limited movement relative to the housing. The cylinder part and the pressure fluid pump are interconnected by flexible conduits leading from the pump to the opposite working chambers of the cylinder part, and a direction-changing device controls fluid flow through the conduits.

Abstract: Impact driven tools of the type generally comprising a bitter end bounded by a collar and a shank and a tip are provided with internal silencing means comprising an opening in the bitter end, said opening filled with a sound attenuating material, which is preferably steel shot loosely packed in the opening and retained therein by a force fit plug secured by a weld. The opening is preferably axial and extends through the bitter end to or below the collar. In large diameter impact driven tools multiple openings are provided parallel to the axis and terminating at staggered points. Each such hole is filled with a sound attenuating material, such as steel shot. The rams of impacting apparatus, or air hammers, are also provided with internal silencing means comprising at least one opening, each such opening being filled with sound attenuating material, which is preferably steel shot loosely packed and retained by a force fit plug secured by a weld.

Abstract: A very powerful pile driver is disclosed capable of operation in the air, partially submerged or totally submerged in the ocean for driving long piles into the ocean floor in deep water construction jobs. The pile driver includes a cylindrical housing, a movable massive weight within the housing, an annular cylindrical thrust-transferring member defining a discharge chamber below this weight, and a movable driving head attached to this annular member, forming a thrust-transmitting assembly adapted to be engaged with the pile. Pressurized gas such as compressed air is discharged from gas discharge apparatus, called an airgun located within the discharge chamber and provides two driving thrusts for each discharge.

Abstract: A percussive device comprising a housing with a pointed front end and a hammer piston accommodated in the housing to form a front working chamber therewith. The hammer piston is provided, in the rear portion thereof, with a cavity in permanent communication with a source of compressed air, the cavity serving as a rear working chamber. An airdistribution mechanism includes a tube mounted in the housing within the hammer piston cavity so that it is conjugated with the walls of the cavity, the piston having air passages therein positioned in such a manner that, during the reciprocation, the tube alternately communicates the front working chamber, via these passages, with either the rear working chamber or ambient atmosphere.

Abstract: Power hammers for driving piling, and the like, free of any complex valve mechanism likely to require attention and comprising a working cylinder having an anvil at the lower end thereof and a ram operative as a piston in the cylinder, cooperative with the anvil and surrounding walls of the cylinder to form an expansion chamber, the ram having a passage extending from an annular groove intermediate the ends of the ram, down through the lower end to the expansion chamber and the cylinder having pressure supply and exhaust ports to register with the passage and to be uncovered by the ram, in lower and upper positions of the ram in the cylinder, whereby the essential functions of the hammer are automatically effected in the normal operation of the ram. Pressure controlled valves may be added to automatically hold desired pressures and release opposing pressures on the ram.