Abstract: A steering control valve system for a crawler vehicle has four valve spool bores formed in parallel to each other at equal intervals in a valve body, four valve spools respectively inserted slidably into the four valve bores, four actuator members respectively inserted slidably into the four valve bores so as to respectively actuate the four valve spools, and a link mechanism for operatively connecting between the four actuator members and operating mediators, wherein the valve system is controlled by only a push-in operation of the valve spools. The operating mediators are steering levers and a brake pedal or electric motors and operating buttons.

Abstract: Clutch-clutch-brake steering unit having hydraulically actuated cylinders for controlling same to control rotation of a track-drive sprocket in a crawler tractor. Specifically, one of the clutch cylinders and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that a single pressure signal in the inlet-outlet port alternately operates the cylinders to apply the brake and release the one clutch, to apply the one clutch and release the brake or, by proper modulation, to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.

Abstract: A tractor transmission having multiple ratios and dual power gearing arrangement located between an engine and multiple ratio gearing whereby the auxiliary gearing effects two multiple ratio drive ranges and wherein shifting from one range to the other in the auxiliary gearing can be accomplished smoothly and wherein the rotary components of the auxiliary gear unit are characterized by low inertia and low power loss.

Abstract: A power drive (10) for providing from a single speed range input drive motor (12) a dual speed range output and a braking function. The selective control of the output shaft (13) is effected through the use of only a brake and a clutch (27,28) under the control of pistons (33,40) and a biasing spring (38). The mechanism provides the desired control by suitable application of fluid pressure to associated piston chambers (34,41) thereby effecting different operating conditions and connections of the gearing (15,16,17,21,22) of the drive.

Abstract: A steering control system for crawler tractor type vehicles with dual power trains which is capable of separately driving left and right endless track mechanisms and comprises an interlocking valve unit and a hydraulic circuit, the interlocking valve unit being located between a manually operated section and an actuating section and adapted to operatively connect these two sections with each other, the manually operated section including left and right steering levers and a commonly used brake pedal, the actuating section including left and right steering brake units and a center clutch unit, the hydraulic circuit selectively supplying hydraulic fluid delivered by a hydraulic pump into the actuating section in response to the action of the interlocking valve unit caused by the manipulation of either of the steering levers and/or the brake pedal.

Abstract: An inching drive for a clutch/brake unit, the unit having a main housing and an input shaft and an output shaft operably associated with said main housing, the inching drive comprising an inching motor having a drive shaft, a housing secured to the inching motor into which the inching motor drive shaft extends, a first gear mechanism disposed at least in part within the inching drive housing and operably associated with the inching motor drive shaft, a second gear mechanism operably associated with the input shaft of the clutch/brake unit, and a mechanism for selectively engaging said first gear mechanism with said second gear mechanism wherein engagement of the first gear mechanism with the second gear mechanism permits the inching motor to drive the input shaft of the clutch/brake unit.

Abstract: In a fly wheel power press having a rotatable drive shaft mounted in a housing and with an H-shaped yoke to which pivot pins are mounted and from which a pair of clutch shoes and brake shoes depend, an adjustment mechanism having a knurled portion on the pin and a cooperating knurled aperture in a lock plate which is in sliding engagement with the knurled portion of the pin so as to permit securement of the lock plate, and thereby the clutch and brake shoes, in a pre-selected adjusted position to one of the uprights is disclosed.

Abstract: A clutch and brake system for starting and stopping a power press uses hydraulically actuated brake and clutch mechanisms. To start the press, the brake is hydraulically released while the clutch is hydraulically engaged at a predetermined intermediate torque level which is less than the full clutch torque level. The clutch is maintained at that intermediate torque level until the present drive shaft has attained its substantially full speed, and is then increased to the full clutch torque level. To stop the press, the clutch is hydraulically disengaged while the brake is hydraulically engaged at a predetermined intermediate torque level which is less than the full brake torque level. The brake is maintained at this intermediate torque level until the press drive shaft has substantially stopped, at which time the brake torque is increased to the full brake torque level.

Abstract: A vehicle inching mechanism is interlocked with a braking mechanism so as to overlap their operating ranges without hampering the low-speed start or stop of the vehicle by the inching mechanism. An inching pedal and a brake pedal are mounted side by side on a stationary shaft via sleeves rotatably fitted thereover and linked to an inching valve and a brake master cylinder, respectively. The sleeves have square jaws at their opposed ends for mating engagement, with clearances therebetween to allow rotation of either sleeve relative to the other within limits. A torsion spring is anchored at one end to the inching pedal sleeve and held at the other end against an abutment on the brake pedal sleeve. Upon depression of the inching pedal, therefore, not only the inching valve but also the brake master cylinder is activated, first through the torsion spring and then through the intermeshing jaws. The depression of the brake pedal results only in the actuation of the master cylinder.

Abstract: Clutch-clutch-brake steering unit having hydraulically actuated cylinders for controlling same to control rotation of a track-drive sprocket in a crawler tractor. Specifically, one of the clutch cylinders and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that a single pressure signal in the inlet-outlet port alternately operates the cylinders to apply the brake and release the one clutch, to apply the one clutch and release the brake or, by proper modulation, to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.

Abstract: In an agricultural vehicle in which a power takeoff modulating valve is shifted in response to a control lever so as to pass pressurized hydraulic fluid through a groove in the outer surface thereof between recesses in an adjacent bore wall for application to a power takeoff clutch to cause engagement of the clutch, application of the hydraulic fluid pressure to the clutch is modulated by an arrangement which selectively diverts the pressurized hydraulic fluid away from the clutch and to a sump in accordance with the rate of pressure increase of the hydraulic fluid to prevent excessively rapid engagement of the clutch. The hydraulic fluid is sumped by a trimmer valve having a first end which immediately responds to high fluid pressures by sliding into a position which sumps the conduit supplying hydraulic fluid to the clutch by an amount directly related to the pressure.

Abstract: A two-speed transmission with hydraulic actuation of the shifting operations under load for hydrostatically operated work machines, particularly caterpillar-track excavators, having a planetary gearing provided with double planet gears, and having packs of discs which are arranged coaxially around the axis of the sun gear of the planet gearing and which act as a clutch or as a brake, respectively. The planet carrier of the planetary gearing is formed as a flywheel and the shifting step of the transmission which serves for starting the work machine is shifted by means of compression springs, and the parking brake, biased by springs, connects the clutch and the brake non-rotatably relative to the housing of the transmission.

Abstract: A winch control valve is provided for controlling the flow of fluid to and from a clutch and a brake of a winch transmission which are operable for establishing a hold condition in the winch when no fluid pressure is connected to the clutch and brake, a free spool condition wherein pressure fluid is connected to only the brake, and a wind-in condition wherein fluid pressure is connected to both the clutch and the brake. In addition, the valve spool is provided with lands which are dimensioned slightly smaller than service ports leading to the clutch and brake of the winch so that pressure fluid may selectively be routed to the service ports and at the same time, be metered to sump whereby a partial clutch engagement pressure may be effected in the clutch to thereby establish an inching condition and whereby partial pressure may be established in the brake passage for effecting a partial release thereof so as to establish a controlled release condition in the winch.

Abstract: Clutch-brake steering unit having hydraulically actuated cylinders for controlling same to control rotation of a track-drive sprocket in a crawler tractor. Specifically a clutch cylinder and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that a single pressure signal in the inlet-outlet port alternately operates the cylinders to apply the brake and release the clutch, to apply the clutch and release the brake, or by proper modulation to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.

Abstract: An improved coupling disk and friction ring arrangement provides for long life, high speed operation of clutches and/or brake devices operated by fluid pressure as in vacuum operated clutch and/or brake devices. The improved coupling disk has stepped ring-shaped portions tapering to a minimal outer annular disk portion having greatest flexibility in the overall flexible disk. The outer portion contacts a friction ring to seal a gap therebetween and provide coupling between an axle on which the disk is mounted and a housing to give either clutch or brake output. The friction ring acts in coupling with the disk while an encircling peripheral annular portion of the disk provides a leakage gap of constant predetermined value unaffected by wear in the disk or friction material. Preferably the gap is formed by burnishing the friction material using the eccentricity of the disk to define a minimum gap. The gap has a size such as to provide a block to leakage air flow.

Abstract: Right- and left-hand steering clutch and brake control valves each include a valve plunger, brake control spool and clutch control spool arranged in serial order in a valve bore with coil compression springs being interposed between the plunger and brake control spool, between the brake and clutch control spools and between the clutch control spool and an end of the bore. The reacting force on the control spools is a spring and constant hydraulic force while the applied force is by way of springs and hydraulic function pressure.

Abstract: In first gear, a brake band prevents one gear of the planetary gearing of an automatic transmission from rotating. In second gear, a clutch causes this gear to rotate as a unit with the drive and driven shaft of the transmission. For an upshift under load, the clutch is engaged slowly, thereby decreasing the required brake torque. The brake force is therefore decreased at a corresponding rate. A switch having a movable contact is mounted so that the contact is moved in response to the reactive force created between the brake band and the gear box. This reactive force varies as a function of the brake force and also depends upon the direction of movement of the braked member. The switch is set to a threshold value which is substantially less than the brake force applied in first gear.

Abstract: A drive train for a winch from a continuously rotating input source to an intermittently rotated drum in which the drive train is through a clutch, then to a shaft, then through a continuously driven internal brake which forms a part of the drive train from the shaft, then to the drive train to the drum, with the shaft being provided with a one-way clutch so that the brake automatically is engaged for lowering the load by reversing the drum. A free-spool circuit is provided which can be operated only in the brake release position for safety and is operated off the brake release hydraulic control fluid pressure. A static or manual pump control fluid circuit is provided for operating the clutch, brake and/or free spool. A combination driving clutch and drag clutch are energized by opposite directional movement of a single piston for coupling an input to an output or stopping movement of the output.

Abstract: A track-type vehicle having a pair of steering clutches and associated steering brakes which includes a pair of actuator members each movable to sequential positions to sequentially effect disengagement of the respective steering clutches and then actuation of the respective steering brakes. Independent actuation member is provided for allowing the steering brake to be actuated without disengagement of the associated clutch.

Abstract: Clutch-brake steering unit having hydraulically actuated cylinders which are adapted for controlling same to control rotation of a track-drive sprocket in a crawler tractor, and which are under control of a clutch-brake steering valve mechanism. A bore in the valve is common to and receives both an independently slidable hydropotentiometer spool precisely providing a master setting pressure, and an independently slidable metering spool providing a single pressure signal always hydraulically matched with the precise master setting pressure. A clutch cylinder and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that the generated single pressure signal when applied to the inlet-outlet port alternately operates the cylinders to apply the brake and release the clutch, or to release the brake and apply the clutch, or by proper modulation to partially engage either, i.e.

Abstract: A multi-speed hydrostatic drive is disclosed. The drive comprises the combination of a drive unit having at least one output connectable to a motive member and at least first and second inputs. A clutch unit is connected to the first drive unit input, and a first fixed displacement hydraulic motor is connected to the clutch unit so as to drive the drive unit first input through the clutch when the clutch is engaged. A brake unit is connected to the second drive unit input. A second fixed displacement hydraulic motor is connected to the brake unit so as to drive the drive unit second input when the brake is disengaged. A variable displacement hydraulic pump is also provided. A hydraulic circuit delivers the pressurized fluid to the first and to the second hydraulic motors to provide a relatively low speed, high torque drive. Alternatively, the hydraulic circuit can be set to deliver pressurized fluid to the second motor only to provide a relatively high speed, low torque drive to the motive member.

Abstract: A master cylinder and brake valve assembly for operating the clutch and clutch brake of a heavy road vehicle is arranged such that up to a first given displacement of the master cylinder piston the clutch release mechanism only is connected to the master cylinder and, above a second further given displacement of the piston, the brake actuator only is connected to the master cylinder, there being a step change in thrust applied to the piston between the given displacements.In a modification, above a third further given displacement of the piston, the brake actuator is reisolated from the master cylinder.

Abstract: The braking system for the textile machine is provided with a multiplicity of brake elements which are individually controlled via a common control means. Each brake has a different braking characteristic from the other so that the machine components or attachments can be separately braked. The braking system can be electronically controlled so as to not only brake but also to permit adjustment of the brakes.

Abstract: A grinding mill having heavy duty transmission including a hydraulic clutch is provided with an inching capability, a slow running capability, a braking capability and overload prevention, as well as synchronization capability.

Abstract: A hydraulically operated control arrangement for a transmission includes a spring-loaded pressure regulating valve which slides into a position to cut off an exit chamber for hydraulic fluid from an input chamber for pressurized hydraulic fluid so as to route the incoming hydraulic fluid exclusively to the transmission for various control and lubricating functions when hydraulic fluid pressure in the input chamber falls below a first threshold value. Hydraulic fluid applied to the input chamber continues to feed a first plurality of functions within the transmission via the input chamber and a second plurality of functions in the transmission via an intermediate chamber disposed between the input and exit chambers and in communication with the pressure regulating valve until such time as the hydraulic fluid pressure at the input chamber drops below a second threshold value so as to permit the pressure regulating valve to cut off the intermediate chamber from the input chamber.

Abstract: A crawler tractor vehicle having fluid actuated steering clutches and associated steering brake includes a control apparatus for each clutch and brake system, including a valve made up of a valve body, and a clutch valving spool and a brake valving spool movably associated therewith. The vehicle further includes a transmission operable upon supply of fluid pressure thereto and a priority valve for providing that a certain level of fluid pressure is supplied to the brake system to provide a disengagement thereof prior to fluid pressure being supplied to the transmission.

Abstract: PCT No. PCT/US79/00293 Sec. 371 Date May 2, 1979 Sec. 102(e) Date May 2, 1979 PCT Filed May 2, 1979 PCT Pub. No. WO80/02446 PCT Pub. Date Nov. 13, 1980.In a control (28) for a hydraulically operated draw works or the like having a hydraulically disengaged brake (14), a transmission (10, 12) and a brake control valve (114, 122), the improvement including an accumulator (174) having a check valve (196) connected between the brake control valve outlet (152) and the brake (14) to modulate the application of the brake (14) after the brake (14) has been fully released and to provide no modulation of brake (14) application after the brake (14) has been only partially released to thereby minimize shock in the draw works components when a load is lowered rapidly and yet provide rapid action when operated slowly.

Abstract: A failure detecting apparatus for a dual valve provided in a pneumatic circuit for a slide of a press machine, which comprises an air tank containing compressed air therein, a clutch and brake mechanism for the slide selectively connectible with the air tank, a pair of solenoid valves connected in parallel with the air tank and the clutch and brake mechanism, each of the solenoid valves having two positions wherein the clutch and brake mechanism is connected to atmosphere when the solenoid valve is at first position and is connected to the air tank when the solenoid valve is at second position, and a pressure operated switch interposed between the solenoid valves and the clutch and brake mechanism wherein the pressure operated switch is adapted to be turned on and off for each cycle of the slide when both solenoid valves are in good working order.

Abstract: A crawler tractor vehicle having steering clutches and associated steering brake includes a control apparatus for each clutch and brake system, including a valve made up of a valve body, and a clutch valving spool and a brake valving spool movably associated therewith. In one embodiment, the clutch valving spool and brake valving spool are identical in configuration, and are disposed in a common bore. Actuator means are associated with such clutch valving spool and brake valving spool, in one embodiment including an actuator assembly made up of a plurality of plungers movable relative to each other and relative to the valve body to provide particular movement of the clutch and brake valving spools. In another embodiment, the actuator means comprise mechanical linkage means, for providing movement of brake and clutch valving spools positioned in respective separate bores defined by the valve body.

Abstract: An apparatus and a method for controlling the braking operation of a machine having a large moment of inertia. The machine is driven by a motor through a coupling device. The control circuitry initiates first an uncoupling of the coupling device followed by a braking of the input side of the coupling device. Thereafter, and after the input side of the coupling has come to a stop, the coupling device is reactivated to couple the output side to the input side. Since the input side is blocked, this will effectively bring the machine to a halt.

Abstract: The coupling and brake of a press receive pressurized fluid through a safety valve. The safety valve comprises two switching valves, so that if one of the switching valves fails and cannot close the other one can be closed. The safety valve is provided with a pressure-responsive switch which generates a shut-off signal commanding that the press be shut off, in response to a variety of malfunction situations, e.g., when the switching valves are closed but nevertheless a pressure build-up is occurring, or when the switching valves are open but the pressure being furnished to the coupling and brake does not reach or suddenly drops below the threshold levels to which the coupling and brake can respond.

Abstract: A pressure biased control valve holding the valve in the actuated position against the force of a return spring operating in connection with a linkage having a separate return spring and a loss motion connection to allow the valve and linkage to operate independently to the return position and assure the pressurized fluid in the valve maintains the valve in the actuating position regardless of pressure changes in the hydraulic system.

Abstract: A vehicle brake system having service brakes and a transmission with internal brakes in the transmission including an output brake and a gear reaction brake system providing friction braking of the transmission output. The transmission has planetary gearing in a housing and a first ratio fluid-operated reaction brake for braking a reaction gear for first ratio drive, and second and third ratio fluid-operated friction devices for establishing second and third ratio drives. The service brake system engages the service brakes and provides an output brake pressure increasing with brake demand to engage the output brake to brake the output shaft in all ratio drives.

Abstract: A valve for controlling the flow and pressure of fluid in a fluid operated system in which a hollow, ported control valve spool is movable in response to selective operation of a manually actuated actuator valve spool to effect modulation of a first fluid flow through the valve. One end of the hollow, ported control valve spool engages a plug portion of a freely floating piston movable in response to fluid pressure from a second fluid source to close a normally open port in the hollow control valve spool.

Abstract: A disc-type brake apparatus adapted for installation in combination with the drawworks of a well bore drilling operation for automatically sensing any reverse torque situation in the drill pipe and quickly set the brake for precluding transmission of any reverse torque to the rotary table drive and clutch mechanism therefor.

Abstract: An automatic transmission for automobiles having a gear means, a clutch and a brake, the engagement and disengagement of the clutch and the brake being changed over four shifting speed stages, wherein one of the mutually engageable friction elements of the brake is mounted to a housing of the transmission so as to be rotatably shiftable with respect to the housing through a small angle so that forward or backward rotary shifting of the friction element mechanically operates a timing valve which controls supply or exhaust of oil pressure to or from the brake.

Abstract: An improved cyclical centrifugal machine includes a rigid support mounted above the basket of the machine, a bearing housing suspended from the support for gyratory motion, a basket-carrying spindle rotatable in fixed position relative to the housing on bearings therein, and an electric motor for bringing the spindle and basket to rotational speed. The improved centrifugal machine also comprises a system for controlling transmission of torque from the motor to the basket by means of a clutch having relatively rotatable clutch members adapted to transmit torque through liquid films between them. The clutch is operated to vary the torque transmitted from the motor to the basket so as to produce a maximum load to be placed on the motor for producing a desired basket speed.

Abstract: The drive mechanism is installed intermediate a motor and a conveyor drive and comprises a clutch arranged between the driving section and the driven section and a brake arranged to stop the driven section. A pump is drivably connected to the driven section and feeds fluid pressure via a relay control valve to actuate the clutch and the brake, the control valve ensuring that the clutch is not applied before the brake is released.

Abstract: Clutch-brake steering unit having hydraulically actuated cylinders for controlling same to control rotation of a track-drive sprocket in a crawler tractor. Specifically a clutch cylinder and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that a single pressure signal in the inlet-outlet port alternately operates the cylinders to apply the brake and release the clutch, to apply the clutch and release the brake, or by proper modulation to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.

Abstract: The control apparatus is capable of setting an automatic speed changing point corresponding to the output of the throttle position of an internal combustion engine and changing an automatic speed change range in accordance with an operation mode of a range select lever. The control apparatus is further capable of setting upper and lower limit speeds of the automatic speed change range.

Abstract: A drive arrangement for a mechanically driven press with the press including at least one drive shaft mounted in a press frame and at least one eccentric or crank arranged on the drive shaft with a clutch being operatively connected to the drive shaft for permitting a press stroke operation upon engagement of the clutch. At least two hydraulic brakes are provided for braking the press between press strokes and a two system hydraulic circuit is provided for controlling the operation of the clutch and the at least two brakes.

Abstract: An auxiliary drive is provided for a drive mechanism for a conveyor, the mechanism including a brake and clutch arrangement designed to facilitate the starting and stopping of the conveyor. The auxiliary drive is conveniently mounted on the mechanism and has a drive motor driving a gear through an intermediate pinion, a gear wheel fixed to the driven stage of the mechanism. The intermediate pinion is movable to engage both the gear wheel and gear to transmit drive from the motor to the driven stage but is actuable to discontinue such drive. The auxiliary drive is intended to provide a means whereby the driven stage may be run at a speed lower than its normal operating speed, a particular application being to conveyors of the scraper chain type which at times require tensioning or detensioning of the chain for maintenance purposes, but at speeds lower than can be achieved using the main drive motor.

Abstract: Apparatus for controlling steering clutches and independent brakes of a vehicle comprising a steering device responsive to a pair of clutch actuating steering levers for selectively and independently disengaging the clutches for steering purposes. Operation of a single brake pedal and the disengagement of at least one of the clutches selectively and independently engages the vehicles brakes. An inhibiting mechanism coupled to the steering device selectively inhibits either of the vehicle brakes from responding to actuation of the brake pedal when one of the steering levers is actuated to disengage the corresponding clutch, and prevents the opposite brake from being engaged during brake pedal operation. As a result, the vehicle may be steered while employing a pair of steering levers and a single foot pedal. A control system permits the vehicle to be stopped when both steering levers and the single foot pedal are actuated by inactivating the brake inhibiting mechanism.

Abstract: A single cycle control system for a press or the like in which interrupted stroke protection is combined with novel interconnections of the control components in the system such that the failure of any single control component cannot endanger the operator of the machine. Relay failure (even a simultaneous failure of two) is completely eliminated as a possible source of an unexpected repeat stroke of the machine. The solenoids for operating the air valves that control the operation of the machine are energized initially through the usual run switches for the machine, after which these solenoids are kept energized through separate holding circuits which include limit switches operated by the machine and switches operated by the respective air valves.

Abstract: Double-drum winch has a hook drum for actuating a hook through a hook wire wound around the hook drum and a boom drum for actuating a boom which supports the hook through a boom wire wound around the boom drum each rotatably mounted on a drum shaft, a hook clutch and a hook brake engageable and disengageable with and from the drum shaft for driving or arresting the hook drum, a boom clutch and a boom brake engageable and disengageable with and from the drum shaft for driving or arresting the boom drum and a clutch mechanism including a forward driving connection clutch for driving the drum shaft in the forward direction, a reverse driving connection clutch for driving the drum shaft in the reverse direction, and a plurality of different speed clutches for driving the drum shaft at different speeds.

Abstract: A control for a hydraulically operable clutch of a winch applied to a grapple-skidder includes a pressure-reducing valve which is selectively operable to permit the clutch to slip in those instances when a cable connected between a drum of the winch and a load or grapple structure is being wound in and the load or grapple structure comes into engagement with an immovable object such as a tree or framework at the rear of the grapple-skidder. The clutch is of a disc type adapted for operating in a lubricating fluid and the pressure-reducing valve is operative to effect an increase in the flow of lubricating fluid to the clutch when the valve is operated to permit the clutch to slip.

Abstract: Clutch-brake steering unit having hydraulically actuated cylinders for controlling same to control rotation of a track-drive sprocket in a crawler tractor. Specifically a clutch cylinder and a brake cylinder provided in the unit have an inlet-outlet port in common, and are so arranged on a spring-applied-brake, hydraulically-applied-clutch basis that a single pressure signal in the inlet-outlet port alternately operates the cylinders to apply the brake and release the clutch, to apply the clutch and release the brake, or by proper modulation to partially engage either, i.e., slip the clutch or drag the brake to intermediate degrees as desired.

Abstract: A hydraulically operated winch of the type adapted for logging or towing operations and having a rotatable winch drum about which a cable or line is entrained, a normally disengaged clutch being hydraulically operable to provide a coupling between a power input member and a winch drum drive shaft, a normally engaged friction brake normally securing the winch drum drive shaft against rotation while being hydraulically disengagable and a normally engaged clutch providing a selective coupling between the winch drum drive shaft and the winch drum.

Abstract: A control mechanism for regulating operation of a rotatable winch drum through a power train including a brake which is normally engaged by hydraulic pressure to secure the winch drum against rotation and a normally disengaged clutch which is selectively engaged by hydraulic pressure for driving the winch drum in a reeling-in mode, the control mechanism including a control lever which is movable for selectively communicating hydraulic fluid to the brake and clutch, first and second biasing means being associated with the control lever to provide for adjustment of the lever at different rates of modulation.

Abstract: An axially compact clutch and brake mechanism. Inner and outer concentrically mounted clutch and brake drums intermittently coupled respectively by packs of interleaved friction discs and plates are operated by a pressure plate disposed intermediate the clutch and brake disc and plate packs and responds to an annular hydraulic piston to alternately engage the clutch or engage the brake. Brake and clutch packs are axially spaced along the length of concentric input and output shafts while the piston is located radially inwardly of one of the packs and is not axially spaced therefrom so as to reduce the axial length of the assemblage. The mechanism further includes structure whereby the piston is not forced to rotate within its cylinder to thereby lengthen the life of the same.