Abstract: An attaching socket of a working implement fits a tool shaft and has an exterior clamping device with a clamping piece, which with the clamping device in a closed condition engages in the tool shaft through an opening in a wall of the attaching socket. The clamping piece is mounted on a clamping lever which is mounted pivotable exteriorly on the attaching socket about a pivot axis extending substantially perpendicular to the sleeve axis and extends from that pivot axis substantially further than the length of the clamping piece. This clamping piece together with the clamping lever form a bent lever. The clamping lever is pivoted in against the tool shaft in the closed condition of the clamping device, while it is swung out in the open condition far enough from it so that the clamping piece is out of engagement with the tool shaft. With the clamping device closed the end of the tool shaft is braced by the clamping piece axially against a backstop formed by and in the attaching socket.

Abstract: A connecting ring which is screwed with a collar in a passage of a tool handle provides a connection of the tool handle with an extension. The edge of the collar is provided with locking teeth and the interior wall of the tool handle in the passage is provided with locking projections. On screwing in the collar in the passage of the tool handle the locking teeth come into engagement with the locking projections to form a locking seat for the collar in the tool handle by motion in the circumferential direction around the tool handle. This secures the screw connection from undesired loosening. In the same way as the connecting ring can be secured to the tool handle also the cap closing the passage can be secured in a locking seat when the extension is removed from the handle and is not used.

Abstract: An electrical supply apparatus particularly for hand-tools, in the form of a housing having a handle at its upper end and a bottom constituting a skid, the housing having a vertical, longitudinal median plane along which the skid bottom is elongated. An electrical cable can be wound in a recess above this bottom and emerges from an opening below the center of gravity of the apparatus by being connected to the housing by a stress relief. The curvature of the skid is greater in the longitudinal direction than in its transverse direction.

Abstract: A filament-type vegetation trimmer has an electric motor, a head rotatable by the motor, and a supply of a filament in the head, with the filament extending from the head, whereby on rotation of the head by the motor the extending filament section can cut vegetation. The trimmer further comprises a circuit for detecting the current consumption of the motor and for generating an actual-value output corresponding thereto, an actual-value generator for generating a set-point output corresponding to the current consumption of the motor when the filament is extending from the head by less than a predetermined distance, and a comparator for comparing these outputs and generating a signal when the actual-value output is less than the set-point output.

Abstract: A lawn-edge trimmer with a grip at the top of a motor housing, a shield plate at the bottom of that housing overlying a rotor, and a detachable mounting forming a socket for a long-stemmed handle has a motor-control switch with a spring-loaded trigger on the underside of the grip in a cutout of the web-shaped mounting. The tubular handle stem is axially traversed by a thrust rod which, on being displaced by a knob near the handle, acts through a camming mechanism on the mounting to depress the trigger when the mounting and the handle are emplaced on the housing.