Abstract: A screwable device having a retractable threaded section that has a generally tubular shaft extending along a longitudinal axis and having a front section formed with a radially outwardly open aperture and a rear section. At least one locking element comprising a threaded section and being radially displaceable in the aperture between an outer position with the threaded section projecting radially outward from the shaft and an inner position in which the threaded section is recessed within the tubular shaft. An actuating is rod coaxially slidable in the shaft between a front position and a rear position, the actuating rod having a push-button at its rod rear end, the actuating rod having a structure for engaging the locking element in at least one of its positions pressing the locking element into the outer locking position.

Abstract: A screwable device having a retractable threaded section that has a generally tubular shaft extending along a longitudinal axis and having a front section formed with a radially outwardly open aperture and a rear section. At least one locking element comprising a threaded section and being radially displaceable in the aperture between an outer position with the threaded section projecting radially outward from the shaft and an inner position in which the threaded section is recessed within the tubular shaft. An actuating is rod coaxially slidable in the shaft between a front position and a rear position, the actuating rod having a push-button at its rod rear end, the actuating rod having a structure for engaging the locking element in at least one of its positions pressing the locking element into the outer locking position.

Abstract: The invention relates to a stop screw (1) having a stop buffer part (2), which at a region located opposite of the stop screw (2) comprises a substantially spherical protrusion (2a). At a region located opposite of the stop buffer part (2), the stop screw (1) comprises a recess for receiving the substantially spherical protrusion (2a) of the stop buffer part (2) in order to form an articulated connection between the stop screw (1) and the stop buffer part (2). In order to limit the articulated connection between the stop screw (1) and the stop buffer part (2), the stop screw (2) comprises a screw contact surface (1a) and the stop buffer part (2) comprises a stop buffer part contact surface (2b) located opposite of the screw contact surface (1a), wherein a resetting element is provided for resetting the stop buffer part (2).

Abstract: A lock pin has a generally tubular shaft having a front end formed with a radially outwardly open aperture. A locking ball is radially displaceable in the aperture between an outer locking position projecting radially outward from the shaft and an inner position recessed in the shaft. An actuating rod coaxially slidable in the shaft between front and rear positions has a rear end projecting from a rod rear end and a front end at the aperture. The rod has a formation engaging the ball in at least one of its front and rear positions and pressing the ball into its outer locking position. A unitary handle has one end fixed to the rear end of the shaft, an opposite end fixed to the rear end of the rod, and an elastically deformable connecting portion extending between the handle ends and urging the rod into its one position.

Abstract: The invention relates to a recoilless hammer which comprises a hammer head (2) having a handle seat (4) and a hammer handle (3) to be inserted in said handle seat (4). The handle seat (4) is completely covered in the peripheral direction by an elastic material (5). The end of the hammer handle (3) facing the handle seat (4) is provided with a metal sleeve (7) which is seated with its sleeve end (8) in the material (5) and which is provided with a sleeve collar (12) and, at its free end, with a chamfered section (13) for insertion between securing webs of the handle seat (4).

Abstract: A device for holding together two objects with aligned holes has a body formed with a passage centered on an axis, a tubular bolt axially displaceable in the passage and having a front end projecting from the body and a rear end, and a first spring braced between the bolt and the body for urging the bolt axially rearward relative to the body. A pin axially displaceable in the bolt is formed with a radially outwardly open recess having an angled front flank. At least one retaining element, normally a ball, is radially displaceable in the body front end between a retaining position projecting radially from the bolt and a retracted position recessed in the bolt and engaged in the recess. A second spring urges the pin axially rearward in the bolt and thereby urges the angled flank axially into engagement with the retaining element to press same outward into the retaining position.

Abstract: A dead-blow nonmarring hammer has its head and handle portions unitarily formed on half shells which are welded together. Hammer face inserts are received in ends of the housing portion and impact plates can be provided inwardly of the inserts to protect the inserts against wear by the mobile mass within the housing.

Abstract: A device for clamping a workpiece formed with a throughgoing hole and having a pair of faces to a support also formed with a throughgoing hole and also having a pair of faces has a tube engaged along an axis through both the holes in a position of the workpiece and support with one face of the workpiece bearing inwardly on one face of the support, the holes aligned, and the other faces of the workpiece and support turned outwardly away from each other. The tube is formed with a radially throughgoing aperture opening outwardly of one of the outer faces and with a screwthread outward of the other outer face. A retaining element is radially displaceable in the aperture between an extended position projecting radially from the tube and engageable axially with the one outer face and a retracted position generally wholly recessed in the tube. An actuating pin axially displaceable in the tube is engageable with the element to radially displace same into its extended position.

Abstract: A workpiece-position detector used in combination with a workpiece having a face and with a support having a surface adapted to engage the workpiece face has an element at the surface formed with a passage having a mouth open generally at the surface and blockable by the face of the workpiece, a flexible hose connected to the passage of the element, and a feed line connected to the hose. A pump connected to the feed line supplies a gas under pressure to the hose so that the gas exits from the passage mouth when same is not blocked. A restriction is provided in the feed line and a pressure sensor in the feed line downstream of the restriction produces an output corresponding to pressure in the conduit so that when the mouth is blocked the pressure at the sensor is relatively high and when not blocked it is relatively low. A controller connected to the pressure sensor takes action when the pressure sensor detects the relatively low pressure.