Endless belt valve grinder
First Claim
Patent Images
1. Apparatus for grinding a valve member having a head, a stem, a stem axis and a frusto-conical valve on the valve head, which comprises:
- a. a base;
b. a generally cylindrical drive wheel mounted to the base for rotation about a first axis;
c. a generally cylindrical backing wheel mounted to the base for rotation about a second axis spaced from and parallel to the first axis;
d. an endless abrasive belt extending around the drive wheel and the backing wheel in engagement with the generally cylindrical surfaces thereof;
e. drive means for rotating the drive wheel about the first axis;
f. chuck means mounted to the base for gripping the valve stem, said chuck means including a collet for gripping the valve stem and a sleeve for compressing the collet, against the valve stem and stop means for abutting the chuck means thereby limiting movement of the sleeve and compression of the collet on the valve stem, and means for axially adjusting the stop means along the sleeve axis to thereby adjust the gripping force of the collet on the stem;
g. means for rotating the chuck means to thereby rotate the valve about the stem axis; and
h. means for moving the valve face into engagement with the endless abrasive belt during rotation of the valve and movement of the belt, to thereby grind the valve face.
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Accused Products
Abstract
An endless belt valve grinder for refacing valve heads used in internal combustion engines. Grinding is done by rotating the valve face against a moving endless abrasive belt supported on a backing wheel and driven by a driving wheel. The workhead or chuck assembly for holding the valve during grinding is automatically pneumatically actuated for gripping and releasing the valve stem. Air pressure is selected and regulated and a stop is provided to adjust the gripping force on the valve stem.
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Citations
11 Claims
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1. Apparatus for grinding a valve member having a head, a stem, a stem axis and a frusto-conical valve on the valve head, which comprises:
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a. a base; b. a generally cylindrical drive wheel mounted to the base for rotation about a first axis; c. a generally cylindrical backing wheel mounted to the base for rotation about a second axis spaced from and parallel to the first axis; d. an endless abrasive belt extending around the drive wheel and the backing wheel in engagement with the generally cylindrical surfaces thereof; e. drive means for rotating the drive wheel about the first axis; f. chuck means mounted to the base for gripping the valve stem, said chuck means including a collet for gripping the valve stem and a sleeve for compressing the collet, against the valve stem and stop means for abutting the chuck means thereby limiting movement of the sleeve and compression of the collet on the valve stem, and means for axially adjusting the stop means along the sleeve axis to thereby adjust the gripping force of the collet on the stem; g. means for rotating the chuck means to thereby rotate the valve about the stem axis; and h. means for moving the valve face into engagement with the endless abrasive belt during rotation of the valve and movement of the belt, to thereby grind the valve face. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification