Drive shifting apparatus for valve control and the like

Claim 2

Drive shifting apparatus for a valve control and the like comprising motor means, a motor input member, a hand input member, an output member, a clutch member shiftable between a position coupling the motor input member to the output member and a position coupling the hand input member to the output member, spring means urging the clutch member to the position coupling the motor input member to the output member independently of operation of the hand input member, cam means driven by the motor means, said cam means being mounted on an axis separate from the axial mounting of the clutch member and driven directly from the motor means, and latch means engaging the cam means when the clutch member is shifted to position coupling the hand input member to the output member, said latch means being disengaged by operation of the cam means whereby motor operation restores the clutch member to position coupling the motor input member with the output member.

Claim 3

The apparatus of claim 1 in which the cam means comprises a locking cam and a tripping cam.

Claim 4

Drive shifting apparatus for a valve control and the like comprising motor means, a motor input member, a hand input member, an output member, a clutch member shiftable between a position coupling the motor input member to the output member and a position coupling the hand input member to the output member, spring means urging the clutch member to the position coupling the motor input member to the output member, cam means driven by the motor means, said cam means comprising a rotary cam mounted on an axis separate from the axial mounting of the clutch member and having a locking surface and a tripping surface which is eccentric to the locking surface and periodically lifts the latch member clear of the locking surface, and latch means engaging the cam means when the clutch member is shifted to position coupling the hand input member to the output member, said latch means being disengaged by operation of the cam means whereby motor operation restores the clutch member to position coupling the motor input member with the output member.

Claim 5

Drive shifting apparatus for a valve control and the like comprising motor means, a motor input member, a hand input member, an output member, a clutch member shiftable between a position coupling the motor input member to the output member and a position coupling the hand input member to the output member, spring means urging the clutch member to the position coupling the motor input member to the output member, cam means driven by the motor means, said cam means comprising a rotary cam mounted on an axis separate from the axial mounting of the clutch member and having a locking surface and a tripping surface which is eccentric to the locking surface and periodically lifts the latch member clear of the locking surface, and latch means engaging the cam means when the clutch member is shifted to position coupling the hand input member to the output member, said latch means being disengaged by operation of the cam means whereby motor operation restores the clutch member to position coupling the motor input member with the output member.

Claim 6

The apparatus of claim 3 in which the clutch member is mounted on the output member by a sliding splined connection.

Claim 7

Drive shifting apparatus for a valve control and the like comprising a drive motor, a motor driven clutch element in engagement with the drive motor, a hand driven member, a hand driven clutch element in engagement with the hand driven member, an output shaft, a clutch member splined to the output shaft and slidable therealong alternatively to engage the motor driven clutch element and the hand driven clutch element, cam means on the motor shaft, clutch shifting means, spring means urging the clutch shifting means to motor drive position independently of operation of the hand driven member, and latch means connected to the clutch shifting means and engaging the cam means when the clutch member is moved to hand drive position.

Claim 8

Drive shifting apparatus for a valve control and the like comprising a drive motor, a motor driven clutch element in engagement with the drive motor, a hand driven member, a hand driven clutch element in engagement with the hand driven member, an output shaft, a clutch member splined to the output shaft and slidable therealong alternatively to engage the motor driven clutch element and the hand driven clutch element, cam means on the motor shaft, clutch shifting means, spring means urging the clutch shifting means to motor drive position independently of operation of the hand driven member, and latch means connected to the clutch shifting means and engaging the cam means when the clutch member is moved to hand drive position.

Claim 9

The apparatus of claim 5 in which latch means includes a lip which overhangs the edge of the cam when the clutch is moved to hand drive position.

Claim 10

The apparatus of claim 6 in which the cam comprises a locking surface and a tripping surface which moves toward and away from the lip of the latch upon rotation of the cam whereby rotation of the cam releases the latch.

Claim 11

Drive shifting apparatus for a powered valve control comprising a motor input shaft, a hand input shaft, an output shaft, a clutch engaging surface associated with each input shaft, clutch means in driving relationship to the output shaft and shiftable between a position to engage the hand input shaft clutch engaging surface and a position to engage the motor input shaft clutch engaging surface, spring means urging the clutch means into engagement with the motor input shaft, clutch shift means in engagement with the clutch means and operable against the force of the spring means to shift the clutch means away from engagement with the motor input shaft and into engagement with the hand input shaft, rotatable cam means having an axis of rotation separate from the axis of the output shaft and in driven relationship to the motor input shaft, at least two surfaces on the cam means, one surface being eccentric to the other, and latch means connected to and movable with the shift means to engage the cam means when the clutch means is in hand position whereby the clutch means is held in engagement with the hand input shaft, said latch means being disengaged by rotation of the cam means whereby the clutch means are urged by the spring means into engagement with the motor input shaft.

Claim 12

Drive shifting apparatus for a powered valve control comprising a motor input shaft, a hand input shaft, an output shaft, a clutch engaging surface associated with each input shaft, clutch means in driving relationship to the output shaft and shiftable between a position to engage the hand input shaft clutch engaging surface and a position to engage the motor input shaft clutch engaging surface, spring means urging the clutch means into engagement with the motor input shaft, clutch shift means in engagement with the clutch means and operable against the force of the spring means to shift the clutch means away from engagement with the motor input shaft and into engagement with the hand input shaft, rotatable cam means having an axis of rotation separate from the axis of the output shaft and in driven relationship to the motor input shaft, at least two surfaces on the cam means, one surface being eccentric to the other, and latch means connected to and movable with the shift means to engage the cam means when the clutch means is in hand position whereby the clutch means is held in engagement with the hand input shaft, said latch means being disengaged by rotation of the cam means whereby the clutch means are urged by the spring means into engagement with the motor input shaft.