Grinding tool for grinding buttons of a rock drill bit, a grinding spindle and method for mounting the grinding cup on a grinding spindle
First Claim
1. A grinding tool for grinding buttons of a rock drill bit comprising:
- a spindle having a longitudinal axis of rotation;
a grinding cup mounted on the spindle by a tongue-and-socket connection which includes a cylindrical surface disposed on the grinding cup, the cylindrical surface being symmetrical with respect to the axis;
a vibration damper disposed between the grinding cup and the spindle;
a fastener for securing the grinding cup to the spindle, the fastener being attached to the spindle against axial displacement relative thereto, the fastener arranged to engage the cylindrical surface of the grinding cup to rotate the grinding cup when the spindle is rotated in a working direction, the fastener arranged to tighten a grip on the grinding cup when the spindle is rotated in the working direction during a grinding operation, and to permit rotation of the grinding head relative to the spindle in a direction corresponding to the working direction to loosen the grinding head for insertion and removal thereof.
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Accused Products
Abstract
A grinding tool for grinding buttons of a rock drill bit includes a spindle having a longitudinal axis of rotation, and a grinding cup mounted on the spindle by a tongue-and-socket connection. A fastener in the form of a coil spring secures the grinding cup to the spindle. The grinding cup can be inserted into the inside of, or around the exterior of, the coil spring. When the spindle is rotated in a working direction, the spring tightens against the grinding cup. To install or remove the grinding cup, the grinding cup is rotated relative to the spindle in a direction corresponding to the working direction, whereby engagement between the grinding cup and the coil spring becomes loosened.
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Citations
16 Claims
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1. A grinding tool for grinding buttons of a rock drill bit comprising:
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a spindle having a longitudinal axis of rotation;
a grinding cup mounted on the spindle by a tongue-and-socket connection which includes a cylindrical surface disposed on the grinding cup, the cylindrical surface being symmetrical with respect to the axis;
a vibration damper disposed between the grinding cup and the spindle;
a fastener for securing the grinding cup to the spindle, the fastener being attached to the spindle against axial displacement relative thereto, the fastener arranged to engage the cylindrical surface of the grinding cup to rotate the grinding cup when the spindle is rotated in a working direction, the fastener arranged to tighten a grip on the grinding cup when the spindle is rotated in the working direction during a grinding operation, and to permit rotation of the grinding head relative to the spindle in a direction corresponding to the working direction to loosen the grinding head for insertion and removal thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. A grinding cup for grinding buttons of a rock drill bit, the grinding cup having a body defining an axis of rotation and including a forward wear part and a rear shank, a flush channel extending through the shank, the shank including a cylindrical surface arranged symmetrically relative to the axis and defining a sole means of receiving a rotary drive torque during a grinding operation.
- 9. Apparatus for holding an insert-grinding cup, comprising a grinding spindle defining an axis of rotation and including a cylindrical surface at one end thereof adapted to receive a grinding cup, and a fastener for securing a grinding cup, the fastener disposed against the cylindrical surface and attached against axial movement relative to the spindle, the fastener arranged to permit movement of a grinding cup relative to the spindle in a direction corresponding to a working direction of the spindle.
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14. A method for mounting a grinding cup on a grinding spindle for grinding buttons of a rock drill bit, the grinding spindle including a first cylindrical surface, the grinding cup including a forward wear part and a rear shank having a second cylindrical surface connectable to the first cylindrical surface, and a coil spring fastener for interconnecting the first and second cylindrical surfaces, the method comprising the steps of:
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A) attaching the coil spring fastener to the grinding spindle such that the fastener is immovable relative thereto in the axial direction;
B) positioning a vibration-damping element between the spindle and the grinding cup; and
C) moving the grinding cup axially into engagement with the spindle while rotating the grinding cup relative to the spindle in a direction corresponding to a working direction of the spindle to elastically loosen the coil spring fastener and permit the grinding cup to be axially inserted onto the spindle. - View Dependent Claims (15, 16)
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Specification