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US 4,363,120 AGranted
Record player speed changing mechanism
AssigneeU.S. Philips Corporation
InventorsHenri M. Grobben, Michel H. F. Decoster
Life of this patent
Estimating the term…
Abstract
A belt drive record player having a turntable mounted on a main frame and a motor mounted on a resiliently supported sub-frame. A switching member having two fork limbs, for transferring the belt between different speed pulleys, is mounted on the sub-frame and is movable between two positions defined by stops on the sub-frame. A control member mounted on the main frame is disengaged from the switching member except when the speed is being changed.
Claims8
A record player comprising
- a main frame,
- a turntable having a cylindrical drum, supported on the main frame for rotation about an axis, the drum being concentric with said axis,
- a sub-frame resiliently mounted relative to the main frame,
- a drive motor mounted on the sub-frame, having a motor spindle extending at least substantially parallel to said turntable axis, said motor spindle further including a pulley formed with two grooves of different diameters in parallel planes,
- a flexible belt disposed to pass around said cylindrical drum and engaging selectively in one or the other groove of the pulley,
- a switching member comprising a switching fork, movable between two stationary positions to effect transfer of the belt from one groove to the other,
- a control member mounted on the main frame,
- means for coupling the control member to the switching member to effect the transfer, and
- positioning means for retaining the switching fork in the respective stationary position after transfer of the belt,
- characterized in that the switching member is mounted on the sub-frame for movement between the two stationary positions, and that the record player further comprises stop means connected to the sub-frame for determining the stationary positions of the switching member, and means for disengaging the switching member from the control member when the switching member is in either of the stationary positions.
7 more elements
Dependencies are inferred from the claim text.