US PATENT SUBCLASS 91 / 41
WITH CORRELATED CONTROL OF MOTIVE FLUID AND LOCKING MEANS

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

41WITH CORRELATED CONTROL OF MOTIVE FLUID AND LOCKING MEANS {4}
42  DF  .~> By electrical control means
43  DF  .~> Working member position control of motive fluid and locking means
44  DF  .~> Sequential operation of locking means and motive fluid control
45  DF  .~> Common or interconnected valve means control motive fluid and fluid for locking means

DEFINITION

Classification: 91/41

(under the class definition) Apparatus which includes releasable means for holding a working member against movement, in at least one direction, and in which means for controlling said holding means to provide holding and/or release of the working member is so related to means for controlling the flow of motive to or from the motor that operation of the means for controlling the flow of motive fluid to produce starting or stopping of the working member will result in operation of the holding means to produce holding or release of the working member, or, operation of the means for controlling the holding means to produce holding or release of the working member will result in operation of the fluid flow control means to produce starting or stopping of fluid flow to or from the motor.

(1) Note. Motive fluid, so controlled as to be confined or entrapped and which thereby prevents movement of the working member, is not to be considered as locking means under this definition.

(2) Note. Locking means for the working member which is operated only as a consequence of movement of the working member, even though such movement is produced in response to control of motive fluid applied to the working member, is not to be considered as related to the motive fluid control means in such a way as to be included under this definition.

(3) Note. It is immaterial whether the locking means is applied to the working member, a transmission member or the load, provided that operation of the locking means to holding position, in some position of the working member, will hold the working member against movement in at least one direction. If the locking means is applied to hold a transmission member or the load only at the limit of movement of the working member in one direction and does not also hold the working member against movement in the opposite direction it is not to be considered as holding the working member, and is therefore not included under this definition, even though the locking means is correlated with the motive fluid control means.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices, 8, for means to control flow of non-working arresting fluid for the working member of an expansible chamber device, subclasses 15+ for controllable means to prevent movement of the working member of an expansible chamber device and then subclasses 19+ for means engageable between the working member of an expansible chamber device and a relatively movable part to prevent retraction of the working member.

477, Interrelated Power Delivery Controls, Including Engine Control, for the combination of an expansible chamber motor driving a rotary (not oscillating) output shaft and a brake or lock applied to the shaft, there being a joint control for the motor and for the brake or lock.