Hammer drill
First Claim
1. A percussion drill assembly comprising:
- a hollow percussion drill spindle formed with coupling retainers;
an impact rod axially disposed and guided in said spindle for imparting a percussion action to a drill bit;
a drill chuck rotatably entrained with spindle and axially displaceable thereon in a mode with axial displacement and being held against axial displacement in a mode without axial displacement, said drill chuck including a body with an axially directed passage therethrough for transferring the action of said rod to said drill bit, said chuck body being formed with chuck jaws engaging said bit and with coupling retainers cooperating with the retainers of said spindle;
a control ring for actuating said jaws for gripping and releasing said bit, said control ring having teeth in one face thereof;
an axially displaceable coupling ring mounted for precluding and enabling axial displacement of said chuck with respect to said spindle, said coupling ring being formed with a rim directed towards said control ring having a plurality of teeth which on axially positioning of the coupling ring towards a drill bit end of the chuck can operatively engage in the teeth of said control ring;
a contact sleeve between said chuck body and said coupling ring and having annular seat portion at an outer side providing a first lock component; and
a lock sleeve on said chuck body, extending an effective distance into an annular space left between said contact sleeve and said coupling ring, said lock sleeve having a projecting lock formation providing a second component such that, when said coupling ring is held nearer the drill spindle, said second lock component is held in a radially inwardly directed position such that it effectively contacts said first lock component, and said second lock component can be moved, when said coupling ring is closer to said drill, radially outwardly to be released from said first lock component.
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Accused Products
Abstract
A drill chuck can be operated with or without an axial displacement mode with respect to the drill spindle. For operation without the axial displacement mode, lock formations can be moved by way of a coupling ring to engage with a seat portion of a contact sleeve which is fixed to the drill spindle. The lock formations are part of resilient lock strips which are cut from the wall of a lock sleeve secured at the chuck body. The lock formations can be contacted by control projections of the coupling ring. The coupling ring can be moved in axial direction towards the drill spindle so that the contact sleeve is secured due to engagement of the lock formations at the seat portion. At the same time, the chuck body contacts at a spring ring secured to the contact sleeve, and the relative axial movements between the chuck body and the contact sleeve or the drill spindle cannot take place.
40 Citations
20 Claims
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1. A percussion drill assembly comprising:
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a hollow percussion drill spindle formed with coupling retainers; an impact rod axially disposed and guided in said spindle for imparting a percussion action to a drill bit; a drill chuck rotatably entrained with spindle and axially displaceable thereon in a mode with axial displacement and being held against axial displacement in a mode without axial displacement, said drill chuck including a body with an axially directed passage therethrough for transferring the action of said rod to said drill bit, said chuck body being formed with chuck jaws engaging said bit and with coupling retainers cooperating with the retainers of said spindle; a control ring for actuating said jaws for gripping and releasing said bit, said control ring having teeth in one face thereof; an axially displaceable coupling ring mounted for precluding and enabling axial displacement of said chuck with respect to said spindle, said coupling ring being formed with a rim directed towards said control ring having a plurality of teeth which on axially positioning of the coupling ring towards a drill bit end of the chuck can operatively engage in the teeth of said control ring; a contact sleeve between said chuck body and said coupling ring and having annular seat portion at an outer side providing a first lock component; and a lock sleeve on said chuck body, extending an effective distance into an annular space left between said contact sleeve and said coupling ring, said lock sleeve having a projecting lock formation providing a second component such that, when said coupling ring is held nearer the drill spindle, said second lock component is held in a radially inwardly directed position such that it effectively contacts said first lock component, and said second lock component can be moved, when said coupling ring is closer to said drill, radially outwardly to be released from said first lock component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification