Autolocking hammer-drill chuck

Cutting by use of rotating axially moving tool – Tool-support – With tool-retaining means

Patent

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Details

279116, B23B 3112

Patent

active

045868590

ABSTRACT:
A hammer-drill chuck comprises a generally tubular chuck body centered on a chuck axis and having a central axially extending bit-receiving passage and a radially outwardly open chuck-key centering hole. A plurality of jaws radially but not angularly displaceable in the chuck body have inner ends engageable with the drill-bit shank in the passage. An adjustment ring connected to the jaws moves same radially synchronously and thereby centers the bit in the body by engagement of the inner ends with the shank. This ring is formed with axially backwardly directed teeth positioned axially forward of the centering hole such that when a chuck key is fitted into the centering hole its crown gear meshes with the ring teeth. A locking sleeve angularly nondisplaceable on the body carries at least one tooth axially engageable between the ring teeth. This sleeve is axially displaceable on the body between an axially forward locking position with the sleeve tooth engaged with the ring teeth and the sleeve positioned relative to the hole such that the key cannot be fitted to the chuck with the gear meshing with the ring teeth and an axially backward freeing position with the sleeve tooth out of engagement with the ring teeth and the sleeve positioned relative to the hole such that the key can be fitted to the chuck with the gear meshing with the ring teeth. A biasing spring is braced between the sleeve and the body for urging the sleeve axially forward into the locking position. Normally the angular-coupling formations are on the jaws.

REFERENCES:
patent: 4214765 (1980-07-01), Rhom
patent: 4302021 (1981-11-01), Rhom

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