Hilti Aktiengesellschaft

Hans-Christian Donner

Anton Neumaier

Thomas Bader

Josef Hunger

A power screwdriver () with a rotationally driven, axially displaceable mounted tool spindle () with a low-noise torque clutch () which comprises a ratchet-spring biased ratchet coupling () driven by a driven ratchet part () and a rigid slack clutch spring () biased claw coupling (). The ratchet coupling () and the claw coupling () are combined using a common, axially displaceable, freely rotatable coupling sleeve (). The ratchet coupling () has opposing oriented, peripheral inclined beveled cams () and the claw coupling () has opposing oriented catches (). The driven ratchet part () and the coupling sleeve () are arranged freely rotatably on an intermediate sleeve (), which is mounted freely rotatable and axially displaceable on the tool spindle (). The ratchet spring () is arranged between the intermediate sleeve () and the coupling sleeve () and the clutch spring () is arranged between the intermediate sleeve () and the tool spindle ().

Power screwdriver with low-noise torque clutch

A device switch () for a hand-held tool, particularly for a screw drill or drilling machine, having a control device () which is arranged in a switch housing (), a trigger () which is movably supported at the switch housing (), the rotational speed of a driving motor () of the hand-held tool being controlled by the control device () depending on the position of the trigger () relative to the switch housing (), and a pressure increasing arrangement () with a contacting area () on a contacting element () which makes pressing contact with a contact region () of a mechanical resistance element () in a trigger pressure position of the trigger () between a zero load position and a full load position, the displacement resistance of the trigger () being increased by this mechanical resistance element (). The contact region () is arranged outside the switch housing ().

Device switch for electric hand-held tools

A strip magazine for drive-in elements ( ) including a plurality of pairs of retaining webs ( ), and a respective plurality of pairs of at least partially opposite recesses ( ) associated with respective pairs of retaining webs ( ), with the retaining webs ( ) of each pair of retaining webs ( ) defining, together with the recesses ( ) of a respective pair of recesses ( ), an opening ( ) for receiving a stem ( ) of a drive-in element ( ) and with the recesses ( ) of the respective pair if the recesses ( ) extending radially of the respective receiving opening ( ) and sidewise limiting the retaining webs ( ), and with each recesses ( ) having width at least of a half of that of the retaining web ( ).

Strip magazine

A bearing seal with a flat elastic sealing lip ( ), positioned between an outer bearing ring ( ) and an inner bearing ring ( ) with an inner sealing edge ( ), sliding circumferentially on the inner bearing ring ( ). One surface of the sealing lip ( ) facing a lubricant space has radial helical paths formed between members ( ) projecting from the surface. The sealing lip slides circumferentially on the inner bearing ring and lubricant flows in the helical paths.

Bearing seal

A manually operated tool for chipping material from a surface includes a plurality of axially extending needle-type chisels (8) located within a housing (1) and guided in a needle cage (12) positioned within the housing. The needle cage (12) is freely axially displaceable between a stop shoulder (15b) of a guide sleeve (14) and an anvil (17) both of which are axially displaceable within the housing. The guide sleeve (14) is pressed by a compression spring (16) against the anvil (17).

Manually operated chipping tool

A drill chuck for a hand-held drilling device, such as a hammer drill, percussion drill or the like, includes a chuck body mounting a plurality of clamping jaws. An adjusting sleeve is rotatably mounted on the chuck body for positioning a partly frusto-conically shaped bracing sleeve for radially positioning the clamping jaws to secure or release a tool shank. The adjusting sleeve includes gear teeth which can be engaged by a ring gear key for rotating the adjusting sleeve relative to the chuck body. A locking sleeve is axially displaceably mounted on the adjusting sleeve. In a first position, the locking sleeve blocks engagement of the key with the ring gear teeth. In a second position, the locking sleeve is moved affording access by the key to the ring gear teeth so that the adjusting sleeve can be rotated and the clamping jaws radially positioned by the bracing sleeve.

Growing community of inventors

Karlsfeld, Germany

Hans-Christian Donner