Abstract: A hammer drill includes a tubular guide member for transmitting rotational movement to a tool and an anvil axially displaceably supported in the tubular guide member for imparting impacting force to the tool. An impacting mechanism within a cylindrical guide member is aligned with a tubular guide member for transmitting impacting force to the anvil. A tool holder is mounted on the front part of the tubular guide member and has a radially adjustable tool holding zone. The radial adjustment is effected by radially displaceable jaws cooperating with the conically shaped section of the tool holder. When the shank of a tool is inserted into the holder, by axially adjusting the conically shaped section, the jaws can be displaced inwardly into holding contact with the tool shank. For improved concentricity, the cylindrical guide member and the tubular guide member are formed as an axially extending unit.

Abstract: A shear for tape in a roll, comprising a main body adapted to lie along the outer periphery of the roll, a wing hingedly connected to each side of the main body and adapted to lie along a radial surface of the roll, and locking means for joining the inner ends of the wings together. The main body is provided with a blade and a window for the passage of the tape to the blade. Each wing is provided with fingers and each finger is provided with an inwardly-extending peg for engaging the radial surface of the roll.

Abstract: Device in a mechanical nailing apparatus including a nail holder to support and guide a nail into position for nailing by means of a nail driver. The device is especially designed for nails (51) which, after being nailed, has at least one laterally expanded anchoring portion (52). The inner cavity of the nail holder (55, 56) intended to receive the nail defines, along part of the nail (51), a guide seat (53) of non-circular section adapted to co-operate complementarily with a guide portion (52) on the nail (51) such that the nail, as it is carried into position for nailing, is given a definitely fixed angle of orientation about its longitudinal axis relative to the nail holder. By positioning of the nail holder, i.e. the nailing apparatus, into a suitable angle for anisotropic materials, e.g. the fibre direction in wood, an expansion nail may be nailed in the angular position where the nail will reach maximum gripping power.

Abstract: A cylinder displaceable slide gate and power swivel for well drilling rigs and the like comprising a longitudinally extending frame having an upper end and a lower end and including a ground supported base connected to said lower end; cylinder means secured to said base and including piston means adapted for reciprocating displacement between said base and said upper end; a plurality of longitudinally extending guide means connected to said frame and substantially spanning said frame from said lower end to said upper end; said slide gate and said power swivel connected to said piston means and displaceable therewith; and, said slide gate and said power swivel associated with said guide means is disclosed herewith.

Abstract: This improved powder-actuated fastener driving tool includes a fastener-driving piston which is slidably housed in a reciprocating barrel. The barrel is contained in a housing member. The tool includes a movable firing pin slidably disposed in a movable breech member. A firing pin pawl is retained in a slot in the breech member to hold the firing pin in a cocked position. The firing pin is held in place in the breech member by a removable C ring disposed in a groove in the firing pin spring guide. Auxiliary gas-venting passages are disposed in the housing tool barrel adjacent a piston pawl return slot formed in the barrel. The tool includes a tapered muzzle bushing which reduces the possibility of air-firing the tool. The inner or breech end of the muzzle bushing is spaced from the muzzle end of the barrel to minimize the possibility of deformation of the muzzle bushing due to piston overdrive.

Abstract: An automatic door closer has an elongated fluid-filled housing having a closed end and an opposite open end, a plug closing the open end of the housing, a first piston reciprocatably arranged in the housing and dividing the latter into a first pressure space adjacent the closed end and a second pressure space adjacent the plug, a closer shaft adapted to be connected to a door, extending transverse to the elongation of the housing and turnably mounted in the housing in the region of the closed end, elements connecting said closer shaft with said first piston for moving the latter during turning of the closer shaft in door-opening direction in a first direction reducing the volume of the first pressure space while increasing the volume of the second pressure space, the piston-moving elements comprising a piston rod slidingly guided in the first piston and having a free end facing the plug, a spring cooperating with the first piston for biasing the latter in a second direction opposite to the first direction, a

Abstract: A leafed holder for writing pad, papers and accessories includes a pair of like-sized covers retained together by an elongate hinge or spine connecting adjacent side edges thereof and a leafed member hingedly positioned between the covers and retained adjacent the spine, and having a substantially rigid planar surface on one side thereof adapted for use as a writing or organizing surface. A second surface of the leafed member opposite the writing surface includes document storage pockets thereon, and the leafed member is selectably closably retainable with one of the covers in a manner to keep documents retained therebetween.

Abstract: This efficient checking account record keeping and check disposal system, including a method of producing the negotiable instruments for the system, provides checks and check stubs on which information pertinent to the functioning of a checking account may be stored conveniently and efficiently. The invention also is directed to a method of printing the checks and stubs in which the "safety paper" background design may be selectively printed and in which information spaces on the back of said stubs may be printed along with the printing of the background design in one operation.

Abstract: A caster-locking device for baby carriages (1) has a fixed shaft (7) secured to the lower end of a front leg (2) of the baby carriage, a notched cylindrical locking body (8) attached to the fixed shaft, a caster bracket (10) installed for rotation on the fixed shaft, a ground-engaging wheel (4) rotatably mounted on an axle (13) inserted in the caster bracket, a locking lever (14) rotatably attached to the caster bracket and having an operating knob (14d) adapted to be operated for rotation from the outside. Holders (15, 16, 17, 18, 19) hold the locking lever engaged with or disengaged from one or more notches (8a or 8b) in the locking body. The orientation of the locking lever and notches relative to each other and to the wheel is such that the locking can take place only when the wheel is in a predetermined position.

Abstract: A ram for driving elongated objects into the ground including a piston jacket, an anvil disposed on the object to be driven, a mechanism located within the jacket for directly impacting with the anvil and for reciprocating at least substantially in a direction of driving the elongated object during driving operation wherein the mechanism for impacting further includes a plurality of cup springs arranged in series in the direction of driving the object and which are in contact with one another and wherein a lowermost cup spring directly impacts the anvil during driving operation.

Abstract: A clip magazine and feed for orienting a U-shaped clip and a staple fastener at the head of a fastener driving tool triggered after the separation of a single clip from a stacked supply thereof, the clip being automatically positioned for application to a work piece and mounted thereon through engagement of an actuator with the work piece and that retracts the stacked supply of clips from the single clip.

Abstract: A shoe support for supporting a shoe to have a heel attached thereto comprises a generally planar support surface against the heel seat region of the shoe and the heel are located. The support has at least one nail guide formed therein which is inclined to the normal to the support surface and contains a pusher member movable normally to the support surface. A driver rests on the pusher member and is movable, by movement of the pusher member, along the guide to drive a nail therefrom into the heel seat region and the heel. As the pusher member moves sliding movement takes place, normally to the direction of movement of the pusher member, between the pusher member and the driver.