Abstract: A hammer assembly for a power tool. The hammer assembly provides a first, proximal engagement portion couplable directly to a backside of the power. A second, distal engagement portion is directly connected to the first engagement portion. A head portion is directly connected to the second engagement portion. The second engagement portion provides one or more chambers, each chamber housing a spring for storing energy imparted by compressive forces against the head portion. Each spring directly interconnecting the first and second engagement portions through an open side of the chamber facing the first engagement portion. There is a gap between the first and second engagement portions, between their respective distal and proximal surface, which is spanned by the spring, enabling the latter to deflect before said surfaces contact under compressive loading.

Abstract: An impact drill includes an output shaft capable of rotating around a first axis and moving along the first axis, a housing, a first impact block fixedly connected to the output shaft, a second impact block, a stopping element for stopping the output shaft from moving backward, and a movable element mounted on the housing. The housing is formed with a through hole for accommodating the movable element. The through hole passes through the housing in a first line and the movable element is capable of moving to a first position and a second position along the first line. When the movable element moves to the first position, the movable element prevents the output shaft from moving backward. When the movable element moves to the second position, the movable element allows the output shaft to move backward.

Abstract: The present invention relates to a hydraulic hammer, and more specifically, to a low-noise hydraulic hammer, wherein an impact bar that is accommodated inside of a piston is inclined so as not to contact the inside of the piston thereby preventing cracks, and a noise insulating material or a heat sink is installed inside the piston or outside the impact bar, thereby reducing noise and improving heat radiation performance.

Abstract: A hand tool for carrying out at least the screwing/unscrewing and/or percussion operations for boring, marking or punching, in particular on assembling means such as screws, bolts or pins. The hand tool includes at least one body attached to a handle. A tool-carrier rod is provided for carrying an impression corresponding to the operation to be carried out. An integrated means is provided for imparting an axial percussion in the direction of the tool-carrier rod. According to the invention, a shock rod is provided inside the tool-carrier rod and is capable of longitudinal movement for directly imparting the percussion force to the impression.

Abstract: An impactor is externally securable to a container of flowable material to break up bridging or clumping of the material in the container. The impactor comprises a strike plate mountable to an outlet hopper or the like and a drive which axially reciprocally moves the hammer, such that operation of the drive causes the hammer to impact the strike plate to thereby pass vibrations into the container.

Abstract: To ensure that a hammer can retract by a sufficient amount without interfering with a washer receiving a rear end of a coil spring, there is disclosed an impact driver having a washer receiving a rear end of a coil spring biasing a hammer of an impact mechanism to an advanced position. The washer is annular with an inner diameter larger than an inner diameter of an annular groove disposed on a rear surface of the hammer, and includes a frontward extended portion disposed at an inner circumference of the washer. Between a carrier portion of the spindle and the washer, there is disposed a positioner that positions the washer coaxially with the spindle.

Abstract: A fluid powered percussion tool 1 has a housing 2 with a supply channel for pressurized fluid 3, a percussion mechanism 4, a swing joint 5 arranged to carry the percussion mechanism 4 relative to the housing 2 at a point situated between the forward end A and the rear end B of the percussion mechanism 4, at least one elastically resilient element 6 arranged between the housing 2 and the percussion mechanism 4 at a distance from the swinging joint 5 and arranged to load the percussion mechanism 4 against a neutral position in the housing 2 and to absorb the vibrational movements of the percussion mechanism 4, and a flexible connection for pressurized fluid 7 for distribution of pressurized fluid from the supply channel for pressurized fluid 3 to the percussion mechanism 4. The elastically resilient element 6 includes a conical spring 8. The flexible connection for pressurized fluid 7 includes a hose 11.

Abstract: A slap hammer including an adjustable striking member and a releasable retaining mechanism for releasably retaining a sliding weight is disclosed. One described slap hammer comprises a guide rod having a first end and a second end; a striking member coupled to the second end of the guide rod and movable relative to the first end of the guide rod; a sliding weight slidable along the guide rod between the first end of the guide rod and the striking member; a biasing element positioned between the sliding weight and the first end of the guide rod, the biasing element biasing the sliding weight towards the second end of the guide rod; and a releasable retaining mechanism for releasably retaining the sliding weight against the action of the biasing element.

Abstract: The invention is a striking mechanism for a handheld power tools in particular electric hammer. A piston is arranged in an axially bidirectionally movable manner in a guide tube. A striker is provided which acts on a striking pin and which is held in a movable manner in the guide tube. A compression space is delimited by the piston and the striker such that an air cushion is enclosed therein. It is proposed that at least one spring element is provided between the striker and the striking pin.

Abstract: A hand-held drive-in power tool for driving-in fastening elements includes a drive-in ram (13) displaceably arranged in a guide (12), a drive (30) for driving the drive-in ram (13) and having at least one driving spring member (31) for displacing the drive-in ram (13) and formed of a fiber-reinforced plastic material, and a device (70) for preloading the driving spring member (31).

Abstract: A multi-impact hand tool comprises a sleeve, a tool head, a movable rod, a spring and an impact block. With only one impact operation, the multi-impact hand tool can provide a multi-impact effect, thus improving the working efficiency. In addition, the impact force can be directly transferred to the tool head for performing the chiseling operation, thus improving the working efficiency.

Abstract: An impact rapping device includes a stationary anvil integrated with a surface to be rapped, the anvil having a hammering axis perpendicular to the surface to rapped, a hammer arranged to move coaxially with the hammering axis, to hit an impact surface of the anvil, and a device for moving the hammer. The anvil and the hammer form a compact unit, which can be assembled in any position. The hammer is supported to lean on the anvil in such a way that the position of the hammer automatically follows changes of place or position of the anvil, and so that the hammer can move only parallel to the hammering axis.

Abstract: The invention is a striking mechanism for a handheld power tools in particular electric hammer. A piston is arranged in an axially bidirectionally movable manner in a guide tube. A striker is provided which acts on a striking pin and which is held in a movable manner in the guide tube. A compression space is delimited by the piston and the striker such that an air cushion is enclosed therein. It is proposed that at least one spring element is provided between the striker and the striking pin.

Abstract: The invention relates to an impact wrench having a drive motor for driving a drive shaft (10) and an output shaft (38) that can be coupled to a tool holder, and having an impact mechanism, the impact mechanism comprising an anvil (36) that has first impact cheeks (34) and that is coupled to the output shaft (38), and comprising a hammer, which is guided on the drive shaft (10), the hammer having second impact cheeks (24), which engage with the first impact cheeks (34) for the purpose of rotary transmission, wherein the hammer comprises a rotating mass (22) and a control part (20), the control part (20) carrying the second impact cheeks (24) and rotating with the drive shaft (10) in the case of non-impact and, in the case of impact, executing an axial and, preferably, additional, rotational oscillation relative to the drive shaft (10), the control part (20) transmitting the rotation of the drive shaft (10) to the rotating mass (22) and being movably guided in the axial direction in the rotating mass (22) for t

Abstract: An exemplary embodiment of the jet hammer includes an outer sleeve, impact assembly, and a valve assembly. The impact assembly is positioned in sliding relation to the outer sleeve to provide the impact of the jet hammer. The valve assembly generally comprises a cap screw, adjustment sleeve, valve port, inner compression spring, outer compression spring, and lock nut. The inner compression spring is relatively less compressible than the outer compression spring. In operation, fluid enters the valve assembly and acts on the compression springs forming an operational seal between the valve assembly and the impact assembly. In response, the outer sleeve is slidingly displaced from the impact assembly thereby compressing a main compression spring positioned along the mandrel shaft. Once the pressure acting on the valve assembly is released, the main compression spring decompresses forcefully causing the outer sleeve to impact a connection port, bit, tool, or other member attached to the upper end of the mandrel.

Abstract: A hand-held drive-in tool for driving fastening elements in includes a drive-in ram (13) displaceably supported in the guide (12), a spring member (31) for displacing the drive-in ram (13), a device (70) for preloading the driving spring member (31) and a locking device (50) having a locking position (54) in which the locking device (50) retains the driving spring member (31) in its preloaded position (22) and includes an annular member (49) pivotally arranged on the locking device (50) and rollable off the locking stop (53) provided on the drive-in ram (13).

Abstract: A counterforce-counteracting device for a nailer comprises an active device, a rotating member, and a weight device. The active device drives the rotating member and the weight device to move. After the active device moves, the weight device is driven by the rotating member to produce a counterforce, so as to counteract the counterforce of the nailer. Thereby, such a device is secure and is easy to assemble.

Abstract: A fastener driving device is disclosed. The device includes a housing assembly, and a nose assembly connected to the housing assembly. The device also includes a magazine for carrying a supply of fasteners that are provided to the nose assembly, a fastener driver, and a spring that moves the fastener driver through a drive stroke. The spring includes a composite material. The device also includes a motor for moving the fastener driver through a return stroke.

Abstract: A percussion device for a rock drilling machine or the like, which includes providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The the stress pulse is provided by way of a stress element of liquid, which is supported to a body of the percussion device. The stress element is subjected to pressure and correspondingly the stress element is released abruptly, whereby the stress energy is discharged as a stress pulse to the tool in direct or indirect contact with the stress element.

Abstract: The multiple-impact adapter for a hammer tool includes a shroud for removably mounting on the hammer tool. A bore is formed through the shroud between the ends. The shroud has front portion and a rear portion for removably receiving a portion of the hammer device. A drive punch is positioned in the bore for being impacted by the hammer tool and a forward end for impacting an object to be driven. A guide bushing extends forwardly from the shroud. A channel extends through the bushing for receiving a portion of the object to be driven. The guide bushing is slidably mounted on the front portion of the shroud such that the guide bushing is movable between an extended position and a retracted position.

Abstract: A hand-held drive-in tool for driving fastening elements (60) in a workpiece (U) includes a drive-in ram (13) for driving the fastening elements (60) in the workpiece (U), at least one drive spring member (31) for driving the drive-in ram (13), a preloading device (70) for the drive-in ram (13) and the drive spring member (31), a locking device (50) which retains the drive-in ram (13) and the drive spring member (31) in a preloaded position (33) when the locking device is located in its locking position (54), an actuation switch (19), for initiating the drive-in process for displacing the locking device (50), and into a release position (55) thereof, and at least one further switch for displacing the locking device (50) in the release position thereof (55) independent from actuation of the actuation switch (19).

Abstract: An ice chopper having a blade for initially engaging ice with a small force followed by an impact of a larger force to break up the ice. The ice chopper has a tube for a handle having a second tube inside with a compression spring. The second tube has a blade attached, which engages ice and pushes the second tube up inside the tube simultaneously compressing the compression spring. When a stop is reached the second tube stops retracting and the impact force of the downward movement of the tube is absorbed by the blade for breaking the ice. The ice chopper is then lifted off the ice, the compression spring pushes the second tube and the blade downward and the ice chopper is ready for another stroke. An ergonomic handgrip is attached at the top of the tube for gripping the ice chopper.

Abstract: An impact device includes a frame to which a tool is connectible, and a stress element that is supported on the frame and disposed between the frame and the tool. A hydraulic control system leads pressurized hydraulic fluid into and out of a hydraulic fluid space such that the stress element causes a stress pulse in the tool. The hydraulic control system includes a rotatingly installed control valve that has control openings for intermittently leading the hydraulic fluid out from the hydraulic fluid space.

Abstract: A wireline jar tool delivers instrument packages into wellbores and retrieves tools when they get stuck. The jar has several stored spring chambers connected to accelerate an upper spring chamber away from a stuck lower carrier chamber that supports instrument packages. Wireline tension actuates the jarring action and then lowers a sinker bar for reset as many times as required to incrementally jar the un-stick fish uphole. The wire line connects to a conductor that extends inside the tool through a main operating shaft, release coupling, hammer and anvil, lost motion coupling, into the lower chamber where the end connects to the instruments for communication to the surface. A small wireline tension provides unexpected large impact forces.

Abstract: A percussion device for a rock drilling machine or the like, which comprises means for providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The means for proving the stress pulse include a stress element (4) of liquid, which is supported to a body (2) of the percussion device and means for subjecting the stress element to pressure and correspondingly for releasing the stress element (4) abruptly, whereby the stress energy is discharged as a stress pulse to the tool in direct or indirect contact with the stress element.

Abstract: A magnetically operated driving tool includes a body member, first and second stator magnets at opposed ends with like poles facing one another, a movable magnet (traveler), a coupling adjacent each stator coupled to a user-operable linkage, a hammer, and a spring. A user operable linkage causes the traveler to be selectively repulsed by one stator magnet and drawn to the other. In use, a user operates the linkage, rotating the traveler until its polarity and the first stator's polarity match. The first stator magnet magnetically repulses the traveler, propelling it to the second stator magnet. In one embodiment, this action drives a fastener. Another embodiment includes metal coils for generating an electric charge for charging a battery upon movement of the traveler through the coils. Another embodiment includes air nozzles connectable to a pressure tank for compressing air upon each stroke of the traveler.

Abstract: A windows-breaking emergency escape device including a main body, a hammer and a supplementary power apparatus, wherein the hammer and the supplementary power apparatus are installed on the main body. The front end of the hammer extrudes from the surface of the main body. The supplementary power apparatus will reserve enough power in advance to lessen an operating force and to release the reserved power to drive the hammer to break the car window when a car accident happened. Moreover, the main body of the device of the present invention includes a groove containing a cutter.

Abstract: A handy electric nailing gun includes a firing pin, a firing spring for pushing the firing pin to drive nails into workpiece, an output gear rotatable by a motor through a transmission gear set to retract the firing pin during the first half run of each rotation cycle and to release the firing pin during the second half run of each rotation cycle, and three power switches electrically connected in series between the motor and the power source (AC adapter/rechargeable battery) for operation by the user to control the operation of the motor.

Abstract: A power tool (1) has a percussive driving implement for driving an impact tool (8). The driving implement, which may be hydraulic or pneumatic, retracts the impact tool (8) on its return stroke, against the force developed by heavy-duty elastic ropes (24). During the impact stroke the impact tool (8) is urged downwardly by the elastic ropes and, if the tool is upright, by gravity. At the start of the impact stroke the ram (10) is uncoupled by a ball clutch. At the beginning of the return stroke the ball clutch acts to couple the ram once again to the weight (20) and impact tool (8), in order to lift these to the retracted position. The uncoupling of the ram for the impact stroke reduces the loss arising from the resistance of the ram.

Abstract: A magnetically operated driving tool includes a body member, first and second stator magnets at opposed ends of the body with like poles facing one another, a movable magnet (traveler), a coupling adjacent each stator coupled to a user-operable linkage, a hammer, and a spring. In use, the traveler begins magnetically coupled to the first stator and engaged with the first coupling; the hammer holds a fastener. A user operates the linkage, rotating the traveler until its and the first stator's polarity match. The first stator magnetically repulses the traveler, which propels the hammer to insert the fastener and moves to the second stator where it engages the second coupling. The user operates the linkage, causing the traveler to rotate until its and the second stator's polarity match. The second stator then magnetically repulses the traveler, which engages the spring and reaches the first stator, returning to the initial configuration.

Abstract: The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and forwards. A hollow chamber is connected to a compensating chamber by an idling air channel and embodied between the drive piston and the percussion piston in order to receive a pneumatic spring. A valve is arranged in the idling air channel, the opening and closing position thereof depending on the rotational speed of the crankshaft. If the rotational speed of the crankshaft falls below a predetermined value, the valve opens the connection between the hollow chamber and the compensating chamber so that a pneumatic spring can no longer be to embodied in the hollow chamber and the pneumatic percussion tool is placed in a idling position.

Abstract: A new sign post driver comprises a piston which rests upon a post, well pipe or piling to be driven into the ground and a weighted cylinder which reciprocates vertically to impact the piston on the downstroke. The cylinder is raised pneumatically for each stroke and falls by force of gravity to strike an anvil on the piston. An optional spring assist on the downstroke adds to the impact thus adding to the impact for a given weight of cylinder. The result is an exceptionally light and simple post driver for its capabilities.

Abstract: An automobile escape hammer gun includes a body, a striking hammer and a lever. The body has a front and a lower passage formed in the body at the front. The striking hammer is movably mounted in the lower passage, is spring-loaded and has a bottom tip extending out of the body and an annular lip with a bottom formed in the body. The lever mounted pivotally in the body and has an inside end abuts the bottom of the annular lip and an outside end extends out of the body. Therefore, when the lever is pivoted, the inside end of the lever moves the striking hammer into the body. The bottom tip of striking hammer will impact rapidly a window of a vehicle to break efficiently the window when the annular lip escapes from the front end of the lever.

Abstract: In order to avoid the recoil of the striker in a hammer device (tool machine) with a striker (18) that can be accelerated to strike velocity, and a tool carrier (14) receiving the impact of said striker, the invention proposes to arrange the striker (18) between the tool carrier (14) and a corresponding mass carrier (16) which moves together with the striker (18) until the striker (18) strikes the tool carrier (14), imparting its own momentum via the striker to the tool carrier, with a supplementary mass (56) on the mass carrier (16) providing the necessary striking energy.

Abstract: A device for producing an abrupt or sudden feed motion contains in a casing a feed device, which can be triggered by a trigger. The force necessary for advancing the feed device is applied by a spring, which is tensioned with the aid of a drive. The tool requires no cartridges for propellant charges.

Abstract: A cavity wall which is usually made with a hollow concrete block as the inner wythe and brick as the outer wythe is disclosed. A special purpose insertion tool is fitted to a standard hammer tool. A center pin is provided in the insertion tool made with an indent to match the pointed end of the tie. The pin is then pressed into the SDS fitting which is the connection into the drill. The tie end is supported by a short sleeve which, when it contacts the face of the wall, retracts against a spring until the tie driving is completed. A modified embodiment of the adapter recognizes that the tie when activated by the hammer invariably rotates clockwise. Accordingly, if the spring is wound clockwise, the bottom tail end will dig into its seat. On the other hand, if it is wound counterclockwise, it rotates in a “tail skid” relationship to the seat.

Abstract: A working device, especially a ramming device for compacting soil, or a hammer, has a crank mechanism for producing a controlled vibration. The crank mechanism is coupled with a set of springs. According to the invention, the crank disk belonging to the crank mechanism is provided with a counter-mass whose center of gravity is shifted around an angle not equal to 180° from the center of gravity of a crank pin on the crank disk, in relation to the axis of rotation of the crank disk. This prevents vibrations which would be unpleasant for the person operating the device from occurring.

Abstract: A helical wedge tie, anywhere from 2½ inches to 4 inches in length, (which is approximately the width of a standard brick), can be utilized to wedgingly engage the mortar in a wall after a helical main tie has been passed all the way through the mortar and secured in the concrete. The wedge tie may have the same helical pitch as that of the main tie, or it may be a pitch somewhat tighter or shorter to not only fill the space between the host tie and the mortar, but wedgingly engage the same. The auxiliary wedge pin may be pointed at both ends, pointed at one end, or even blunt at both ends. Successful fixes have been made where one end is sheared, and has a relatively chisel-like end. The method of the invention is directed to the reinforcing of a tie in a wall reinforcing environment, where the outer portion of the tie passes through a softer material, and a subsequent reinforcement of the tie portion in the soft material becomes desirable.

Abstract: A casing hammer assembly for a cable tool drilling apparatus and a cable tool drilling apparatus employing the casing hammer assembly. The casing hammer assembly includes a hammer housing which is positioned on a casing pipe and having a central aperture for through passage of a cable tool drilling string. An impact anvil is located in the housing, surrounding the central aperture, and a reciprocal hammer is mounted for striking the anvil. An eccentric arrangement is employed for raising the hammer for repeated striking of the anvil in order to sink the casing pipe. A hydraulic arm is utilized for laterally positioning the hammer housing in relation to the casing pipe.

Abstract: A device for breaking concrete and similar frangible materials to reduce it to rubble includes a power plunger and a trigger mechanism mounted within a casing. The casing may be carried on and operated by construction equipment such as a back hoe. The trigger mechanism is operative to release the plunger for allowing it to be fired by spring means or dropped by gravity for a preset distance against the concrete. The power plunger has a latch member affixed thereto and forming one element of the trigger mechanism. The element consists of a concave spherical latching edge portion on its underside. The trigger mechanism also includes a releasable trigger having a convex spherical latching edge portion which mates with the concave portion. The trigger initially catches beneath the latch member, and is then pivoted to release the latch member and allow the power plunger to be fired. The mating spherical latching surfaces provide for a smooth, minimal-wear release of the trigger mechanism.

Abstract: An adapter is provided that includes a housing, a striker, a spring, a lever, and a hook. The striker is movably mounted in the housing and biased by the spring towards a firing position with a front end extending into an aperture at the front of the housing. The lever is pivotally connected to the exterior of the housing and the hook. The hook extends through an aperture in the housing and is connected to the striker such that movement of the lever will move the striker. The front end of the housing has a connector for connecting the housing to a rear end of a powder actuated connecting tool.

Abstract: A cavity wall which is usually made with a hollow concrete block as the inner wythe and brick as the outer wythe is disclosed. A special purpose insertion tool is fitted to a standard hammer tool. A center pin is provided in the insertion tool made with an indent to match the pointed end of the tie. The pin is then pressed into the SDS fitting which is the connection into the drill. The tie end is supported by a short sleeve which, when it contacts the face of the wall, retracts against a spring until the tie driving is completed. A modified embodiment of the adapter recognizes that the tie when activated by the hammer invariably rotates clockwise. Accordingly, if the spring is wound clockwise, the bottom tail end will dig into its seat. On the other hand, if it is wound counterclockwise, it rotates in a "tail skid" relationship to the seat.

Abstract: A device for breaking concrete and similar frangible materials to reduce it to rubble includes a power plunger and an actuator plunger mounted within a casing. The casing is carried on and operated by construction equipment such as a back hoe. As the back hoe is operated to cock the power plunger by moving the actuator plunger toward the concrete surface, a trigger mechanism affixed to the actuator plunger lifts the power plunger and an associated latch member to load a coil spring associated with the power plunger and presses against the latch member. As the coil is fully compressed, the trigger mechanism engages a trigger operating abutment and releases the latch member. The coil spring then fires the power plunger against the concrete.

Abstract: A release mechanism for a hydraulic/pneumatic post driver is described. The post driver has a hammer and a guide for directing the hammer from a raised release position along a substantially vertical downward impact path. A hydraulically or pneumatically actuated fluid expandable cylinder is disposed above the hammer and has a telescopically extendible piston for lifting the hammer to the raised release position. The improvement includes one of the piston and the hammer having a female member with inwardly directed gripping dogs. The other of the piston and the hammer has a male member with outwardly directed gripping rollers. One of the inwardly directed gripping dogs and the outwardly directed gripping rollers is spring biased to maintain engagement between the dogs and rollers. A triggering mechanism is provided on the guide to overcome the biasing force of the spring to disengage the dogs and the rollers when the hammer reaches the raised release position.

Abstract: An air-operated hammer is provided for removing risers or gates from castings. The hammer includes a piston having a rod to which an impact member is releasably latched. Operation of the piston is controlled by a pneumatic logic control circuit, the operation of which is initiated by simultaneously depressing a pair of thumb-operated pneumatic switches. When actuated, the control circuit acts to cause the piston to retract to cause the impact member to compress one or more blow-delivery springs, with the latch being automatically released, upon desired loading being achieved, to permit the release of the stored energy in the springs resulting in the impact member being impelled against a gate or riser to be broken off. Meanwhile, the circuit operates to reverse the direction of movement of the piston so that it extends to be automatically once again latched to the impact member.

Abstract: An access tool for smashing against a door knob of a door is describe and comprises a pair of telescoping cylinders. The outer guiding cylinder includes a side wall concentric of an axis of symmetry. A hoisting handle of U-shaped cross section is attached at one end of the outer cylinder (the hoisting handle including a pair of transverse legs having openings near the termini thereof) using a bolt-nut combination. The bolt includes a bolt shank extending through a pair of diametrically opposed openings in the side wall of the outer cylinder and thence through the openings in the transverse legs of the handle, whereby achieving pivotable attachment of the hoisting handle. The inner cylinder also includes a side wall that differs from that of the outer cylinder in that a stepped end wall is provided in the mid-region thereof. The stepped end wall includes a central opening for receiving an anvil bolt.

Abstract: A self-contained unit has a probe (N) urgeable against a structure to be tested, a shock assembly (H, I, J, F, M) for applying a shock to the structure through the probe (N), and a transducer (A, B, C) for receiving resulting vibrations from the structure through the probe (N) and providing electrical output data. The unit also includes a memory (b) for storing the data. The unit has a tubular body (E) in which the transducer (A, B, C) is receivable. The transducer (A, B, C) is linked to a weight (H) and springs (G, I) such that urging the probe (N) against a structure progressively compresses springs (G, I), drives the enclosure (A, B, C) into the body (E) and raises the weight (H) until the weight is suddenly released and hits the transducer (C) to supply the shock.

Abstract: A percussive machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) repeatedly drives a hammer piston (15) to impact on the neck (17) of a tool (20) carried by the housing (10). At empty blows with the neck (17) out of reach, the hammer piston (15) is thrown forwardly and caught pneumatically in a braking chamber (47) at the bottom end (12) of the cylinder (11). The braking is combined with an elastic yielding of the bottom end (12) against the action of a recoil spring (23) in the housing (10). The pressure in the braking chamber (47) during such yielding is controlled by throttling apertures (48) in the cylinder (11) uncovered by the bottom end (12). The hammer piston (15) is thus checked to halt pneumatically by throttling avoiding a collision with the bottom end (12) and takes an inactive position below ports (46) in the cylinder wall through which the working chamber (44) is relieved and ventilated.

Abstract: A flow sampling apparatus has a body through which a central inlet conduit runs and a dome on the body. An inlet orifice on the inlet conduit discharges a fluid containing some liquid (milk) and the liquid flows evenly over the inner surface of the dome. One or more outlet ports are connected to a pair of intermediate vanes of a flow divider having at least four vanes and the liquid passing between the intermediate vanes is a representative sample of the whole flow over the inner surface of the dome. The sample is delivered to a sampling flask wither to the bottom of a flask which may be emptied by pressurizing the liquid in the flask or delivery may be by a flexible tube to a selected one of a series of flasks held in a removable magazine.