US 2008/0302548 A1Published application

Percussion Hammer and/or Drill Hammer Comprising a Safety Coupling

AssigneeWacker Construction Equipment AG

InventorsRudolf Berger, Wolfgang Schmid

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Abstract

A safety coupling in a percussion hammer and/or drill hammer, comprising a basic sleeve, a driven toothed wheel that is rotatably mounted on the basic sleeve and can be driven by a drive unit, a closing ring which is fastened to the basic sleeve, and a locking ring located between the driven toothed wheel and the closing ring. Said locking ring is fixed in a torsion-proof manner relative to the closing ring while being movable relative to the closing ring in an axial direction, counter to the effect of a spring mechanism. The locking ring is axially displaced while the driven toothed wheel remains in the axial position thereof when a threshold torque is exceeded.

Claims22

Dependent claims

A percussion and/or drill hammer, comprising;

a drive;
a drill shaft driven by the drive with a torque;
and
a safety coupling situated in the flow of torque between the drive and the drill shaft;
the safety coupling having:
a toothed drive wheel that is capable of being driven by the drive with the torque;
a sealing ring that is situated axially to the toothed drive wheel and via which the torque can be guided;
and
a latch device situated between the toothed drive wheel and the sealing ring, wherein
in a normal operating state, the latch device ensures a flow of torque between the toothed drive wheel and the sealing ring;
wherein
in an overload state, in which a torque exceeding a prespecified boundary torque value is introduced into the safety coupling, the latch device interrupts the flow of torque between the toothed drive wheel and the sealing ring;
and wherein
the latch device has a latch ring that is situated between the toothed drive wheel and the sealing ring and that is capable of being axially displaced against the action of a spring device, and that, depending on its axial position, ensures or interrupts the flow of torque;
the latch ring is rotationally fixed relative to the sealing ring, and is capable of being axially displaced relative to the sealing ring against the action of the spring device;
the toothed drive wheel has a latch toothing on a side facing the latch ring;
the latch ring has, on a side facing the toothed drive wheel, a latch toothing that fits the latch toothing of the toothed drive wheel;
in the normal operating state, the latch ring is pressed axially against the toothed drive wheel by the spring device in such a way that the latch toothings engage in one another;
and
in the overload state, the latch ring is axially displaced in the direction of the sealing ring, and the latch toothings disengage.

17 more elements

A percussion and/or drill hammer, comprising:

a drive;
a drill shaft driven by the drive with a torque;
and
a safety coupling situated in the flow of torque between the drive and the drill shaft;
the safety coupling having:
a toothed drive wheel that is capable of being driven by the drive with the torque;
a sealing ring that is situated axially to the toothed drive wheel and via which the torque can be guided;
and
a latch device situated between the toothed drive wheel and the sealing ring, wherein
in a normal operating state, the latch device ensures a flow of torque between the toothed drive wheel and the sealing ring;
and in which
in an overload state, in which a torque exceeding a prespecified boundary torque value is introduced into the safety coupling, the latch device interrupts the flow of torque between the toothed drive wheel and the sealing ring;
and wherein
the latch device has a latch ring that is situated between the toothed drive wheel and the sealing ring and that is capable of being axially displaced against the action of a spring device, and that, depending on its axial position, ensures or interrupts the flow of torque;
the latch ring is rotationally fixed relative to the toothed drive, and is capable of being axially displaced relative to the toothed drive wheel against the action of a spring device;
the sealing ring has a latch toothing on a side facing the latch ring;
the latch ring has, on a side facing the sealing ring, a latch toothing that fits the latch toothing of the sealing ring;
in the normal operating state, the latch ring is pressed axially against the sealing ring by the spring device in such a way that the latch toothings engage in one another;
and
in the overload state, the latch ring is axially displaced in the direction of the toothed drive wheel, and the latch toothings disengage.

17 more elements

Dependencies are inferred from the claim text.