Abstract: Drilling or percussion hammer with an electric drive motor driving, preferably directly and without the use of any countershaft, a sleeve-like enlarged portion of the drive shaft leading to the tool holding fixture, with the entire striking mechanism being arranged within the said enlarged portion. The striking mechanism comprises a reciprocating driving piston whose cylindrical outer wall is provided with a closed, cam-like guiding groove which is engaged by a guide cam, preferably a driving ball, provided on the sleeve portion of the drive shaft which is driven in the rotary sense. The driving piston, which is permitted to move axially, but retained against rotation, derives the translatory movement of the driving piston directly from the torque supplied by the driving electric motor to the tool holding fixture, the driving piston accommodating in its interior in the conventional manner a striking piston which preferably is cushioned by an air cushion and which acts upon an anvil.

Abstract: Power driving apparatus includes a body portion, a power supplying portion, an actuating portion, a drive portion, a biasing portion and a surface contacting portion. The body portion includes a vertically oriented elongated tubular section, the tubular section including a substantially open lower end. The power supplying portion includes a power source affixed to the body portion spaced from the open lower end thereof, the power source including an output shaft member disposed transversely of the body portion. The actuating portion includes a rotatable eccentric supported transversely axially within the body portion, the eccentric being spaced from the open lower body end substantially parallel to the output shaft member. An arm member has one end pivotally connected to the eccentric and extends therefrom downwardly toward the open lower body end. A weighted hammer section is supended from a lower free end of the arm member and disposed within the body portion.

Abstract: An electrically-operated multi-needle chisel tool including a housing having a front portion and a rear portion. An electric motor is mounted in the rear portion. A cylinder extends forwardly from the front portion of the housing. A piston is disposed in said cylinder for reciprocable linear motion which is converted from the rotary motion of the motor. An anvil is axially slidably supported in the cylinder and positioned forward of the piston so as to be hit by the piston. A needle supporter is axially slidably supported in the cylinder and positioned forward of the anvil so as to be hit by the anvil. A number of needle chisels are individually supported by the needle supporter for axially slidable movement, and a return spring disposed in the cylinder for returning the needle supporter, the piston, the anvil and the needle supporter being adapted to be synchronously reciprocated by the motor. The piston includes a base portion and a reduced diameter shaft portion extending forwardly from the base portion.

Abstract: An automatic compaction assembly for compacting samples of asphaltic or bituminous materials is disclosed. A slide hammer is carried for vertical motion along a guide rod which has a compaction foot at a lower end. A drive chain is driven along a generally triangular path by a suitable drive motor and has weight engaging and raising lugs. An upper chain sprocket shuttle and a lower chain sprocket shuttle are slideably carried in a main frame of the compactor and cooperate with a drive sprocket on the drive motor to define the triangular path of chain travel. A horizontal overarm is formed as a portion of the upper shuttle and receives the upper end of the guide rod. As the guide rod moves downwardly, the release point defined by the upper shuttle also moves down thereby maintaining a constant weight drop distance during sample compaction. The slide weight, after being released from the drive chain continues to move upwardly along the guide rod until its upward travel is halted by gravity.

Abstract: A hand-held power tool, for example a rotary percussive drill, includes a component for undergoing linear movement and a bearing support for the component. The bearing support comprises a cylinder formed from sheet metal strip with the longitudinal edges spaced to form a gap in the wall of the cylinder. By making the bearing support from a sheet metal strip and providing a gap in the cylinder wall considerable cost savings are achieved.

Abstract: A percussive drill has a bit holder, a percussive drive including a ram slidably mounted in a hollow piston, and a drive transmission for reciprocating the ram in the piston via an air cushion. The forward travel of the ram during percussive action of the drill is limited by a drill bit or an intermediate member interposed between the drill bit and the ram. A member holds the ram in a position further forward, than that attained during the above limited travel allowed the ram, when percussive action is not desired. The holding member is resilient, has a U shaped cross-section, and is entered by the ram as it moves to the further forward position, the ram then forming a seal therewith, and the member also functioning to absorb the energy of an impact by the ram.

Abstract: A hammer drill is arranged to rotate and also apply percussive force to a tool receptacle. The percussive force is transmitted from a shaft to a drive piston which, in turn, reciprocates a percussion piston which drives the tool receptacle. The hammer drill includes a housing and a bearing rotatably mounted in the housing. The shaft is rotatably mounted in the bearing and its axis extends perpendicularly of the axis of rotation of the bearing. The bearing supports a contact rim which is in meshed engagement with the shaft. The contact rim is displaceably into frictional contact with a brake member for holding the contact rim against rotation while the bearing rotates carrying with it the shaft. Due to its meshed engagement with the contact rim, the shaft rotates about its own axis causing the drive piston to reciprocate.

Abstract: An automated installation for punching and cleaning converter tuyeres for use in non-ferrous pyrometallurgy. The invention employs a travel unit fixed either to the converter housing permits movement of the punching unit relative to the tuyeres and, consequently, piercing of tuyeres at the converter. The unit consists of a punching rod slidable along the axis for introducing the punching end-piece of the punching rod into the tuyeres and a car securing the opposite end of the punching rod. The car resting on the rail is moved along by a driving unit. The drive mechanism of the travel unit has at least one power cylinder located transversally with respect to the rail, whereas on the extended end of the piston rod of this cylinder is a carriage with at least one pair of pull rods is mounted being coupled with the rod in an articulated way.

Abstract: A pile driver in which a weight is reciprocated in a frame along a vertical path. The weight is suddenly retarded just before the weight reaches its lowermost position and the resulting high force is transmitted to the pile without an impact occurring. In one embodiment, the weight is connected to the frame by two pivotal links and these links are used to retard the weight. In another embodiment, the weight is driven upwardly and retarded by a cam mounted on a drive shaft.

Abstract: An impact device incorporating an improved air spring coupler in the form of a novel cylinder-piston is disclosed, in which the air spring is linear, i.e., the air spring stiffness is substantially constant over the operating range of the air spring displacement. Selected relations between piston area, ram mass, cylinder volume and equivalent length, crank radius, frequency of impacts and power available in the impact device are disclosed for which the improvement of such linear air spring stiffness is obtained form preferred embodiments.

Abstract: Rotary-powered exciter-reciprocative means are disclosed by which improvements in efficiency and effectiveness of impact devices, effected by important reductions of wasteful extraneous harmonic vibrations through the use of long double connecting rods, are obtainable in selected embodiments incorporating gearing, by which a smaller lighter weight rotary motor of different rotational frequency from that of the impacting can be utilized.

Abstract: A power driven crankshaft is mounted on a frame and is connected by a pair of connecting rods to a coupler body, having guide means thereon to limit movement of the body to straight line reciprocation. Selected positioning and arrangement of crankshaft, bearings, connecting rods, journals, wrist pins, power drive means, reciprocating body guide means and selected crankarm result in high impact force being delivered to an impact tool with significantly reduced energy loss caused by oscillatory structural deflections spurious vibrations, and rotations. An improved coupler incorporates an air spring with selected central vent means resulting in nearly constant spring stiffness.

Abstract: A tractor mounted, hydraulically actuated, manually controlled, fence post setting and fence wire reeling apparatus including a post driving assembly having a vertically guided, reciprocal weight, a hydraulic motor for lifting the weight and a unique sprocket chain drive assembly interconnecting the motor and weight. The apparatus also includes a multiple fence wire reel assembly with each reel including a spool connected to a hydraulic power device which operates either in a motor mode or pump mode to enable fence wire to be reeled onto the spools or unreeled therefrom with a desired adjustable tension. The apparatus is mounted on a conventional three-point hitch of a farm tractor and the post setting assembly is mounted for lateral swinging movement in order to orient the post in desired alignment and to position the post setting assembly in an out-of-the-way position when the fence wire is being reeled.