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US3594962A Expired / Lapsed US ⏱️ 0.0 years remaining

Grinding machines

Assignee: Chris-Marine AB
•
Filing: 1969-05-07
•
Granted: 1971-07-27
•
Expires: 1989-05-07
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Abstract

Abstract A grinding machine for grinding of valve seats in marine engines. The object of the invention is to provide a machine that is able to grind with sufficient accuracy for the pressures and temperatures at which marine engines operate and to provide a machine which at the same time is easy to apply and to operate. This has been achieved thereby that the machine is provided with a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore and carries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and extends in a plane coinciding with the longitudinal direction of the shaft, the said arm carrying a holder for a grinding wheel and a driving motor associated with the said wheel, and also being displaced by means of a screw-threaded spindle which is mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement, brought about on rotation of the frame by means of the handle, between the frame and the screw-threaded spindle into a displacement of the arm, so that the grinding wheel, depending on the direction of rotation of the frame, is displaced either obliquely upwards and outwards or downwards and inwards in the direction from or towards the shaft.

Inventors

  • 👤 Stig Oskar Christensson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 20:04
CPC Classifications
B; B24; B24B; B24B15/00

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 197 words
A grinding machine, more particularly for the grinding of valve seats in marine engines, wherein the improvement comprises a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore and carries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and extends in a plane coinciding with the longitudinal direction of the shaft, the said arm carrying a holder for a grinding wheel and a driving motor associated with the said wheel, and also being displaced by means of a screw-threaded spindle which is mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement, brought about on rotation of the frame by means of the handle, between the frame and the screw-threaded spindle into a displacement of the arm, so that the grinding wheel, depending on the direction of rotation of the frame, is displaced either obliquely upwards and outwards or downwards and inwards in the direction from or towards the shaft
Claim 2
Dependent Claim 197 words
A grinding machine, more particularly for the grinding of valve seats in marine engines, wherein the improvement comprises a frame which is rotatable about a shaft adapted to be arranged in a valve stem bore and carries an arm which is mounted to be displaceable in an inclined track which is arranged in the frame and extends in a plane coinciding with the longitudinal direction of the shaft, the said arm carrying a holder for a grinding wheel and a driving motor associated with the said wheel, and also being displaced by means of a screw-threaded spindle which is mounted to be rotatable but axially nondisplaceable in the frame, the said screw-threaded spindle being provided at its upper end with a conveniently removable handle for turning the frame about the shaft, means being provided for converting a relative movement, brought about on rotation of the frame by means of the handle, between the frame and the screw-threaded spindle into a displacement of the arm, so that the grinding wheel, depending on the direction of rotation of the frame, is displaced either obliquely upwards and outwards or downwards and inwards in the direction from or towards the shaft
Claim 3
Dependent Claim 66 words
A grinding machine according to claim 1, wherein the improvement comprises movement-converting means that consist of a slide engaging by means of screw threading with the screw-threaded spindle in order to be displace in a vertical sense on rotation of the aforesaid screw-threaded spindle in an aperture in the frame, and that the arm is provided with a pin engaging in a track in the slide.
Claim 4
Dependent Claim 48 words
A grinding machine according to claim 1, wherein the improvement comprises a holder that is provided with a pin for cooperation with the handle so that the holder with the grinding wheel can be pivoted about the shaft of the frame without being displaced in the radial sense.
Claim 5
Dependent Claim 48 words
A grinding machine according to claim 1, wherein the improvement comprises a frame that is radially adjustable relatively to the grinding wheel on a supporting angle which is provided with a bearing and whereby the entire grinding machine can be rotated about the upper end of the shaft.

References Cited (Backward Citations)

US1877782A Cited
US1877546A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-07-26 1975-01-25 1975-07-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-07-26 1979-01-25 1979-07-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-07-26 1983-01-25 1983-07-27 $7700.00 Window Closed / Lapsed

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