Abstract: A device provided with a pedal arm (2) having pawl teeth (12), a latch pawl member (4) having a latch pawl (15) engageable with the pawl teeth (12) for maintaining and releasing a stepped-on position of the pedal arm (2), and a position changing member (5) for allowing the latch pawl member (4) to maintain the position of the pedal arm (2) when the pedal arm is further stepped on from a maintained position. The above constitution realizes a function of setting a braking force by a stepping operation, a function of releasing a braking force by a stepping operation and a function of increasing a braking force by an additional stepping operation.

Abstract: A motor vehicle transmission with a frictional parking lock mechanism is particularly suitable for shift-by-wire applications. The frictional parking lock mechanism makes it possible to have convenient controllability, as compared with positive parking lock mechanisms.

Abstract: A locking device for a movement unit supported displaceably relative to and along a longitudinal axis of at least one guide rod, comprises a pair of clamping members which have each a clamping opening. Each clamping opening has an inner surface for receiving the guide rod. Each clamping member has a foot end and a head end and is pivotable about an axis to assume a first position, in which the inner surface is in frictional braking contact with the guide rod, and a second position for allowing free relative movement of the clamping members and the guide rod. The pair of clamping members has also a corresponding pair of control surfaces facing each other at their head ends. There is an actuation device that acts onto the pair of clamping members to move them from one of their positions to the other. This actuation device includes: a device for imparting movement which has a pressure exerting surface for exerting pressure in a direction towards the clamping members.

Abstract: An apparatus for the application of a braking force to a wheel of a wheelbarrow, hand cart or other type of a cargo portage device includes a twist grip mechanism with a latching type of a ratchet attached to the handlebar of the device. As the twist grip mechanism is rotated a progressive braking force is applied to the wheel by tightening a brake band that extends around a drum that is attached to the wheel. A cable is attached at one end to the twist grip mechanism and to the brake band at its remaining end. The ratchet maintains the braking force that is applied until a thumb release lever is depressed which disengages a ratchet dog from contact with any of a plurality of ratchet teeth.

Abstract: A parking brake for automobiles is disclosed including a brake disk having ratchets to secure interruption of the wheels in parking the automobiles, a caliper arranged on the brake disk forming an inserting groove, an intermittent member engaged into the inserting groove for selectively controlling the brake disk, and connecting means connected with the intermittent member for delivering the actuating force to the intermittent member in actuating the parking brake lever. A rod bar is arranged below the connecting means, forming a hinge connected to the connecting means at one end and a variable portion at the other end. A moveable link connected to the rod bar, having a pair of auxiliary links, and a fixed link are controlled by the parking brake lever to engage the intermittent member into the ratchet of the brake disk to engage the wheels in parking the automobiles.

Abstract: An electrical brake with a holding function, in particular for an electromechanical brake in motor vehicles, is described. The brake contains an electric motor having a holding brake function. To generate the holding brake function, an electric motor with salient stator poles and rotor poles is provided. The motor is acted upon by a defined holding current in such a way that the poles of the motor thereby are brought into a locked position and held there, or are held in a locked position. Advantageously, after activation of the holding brake function and after a locked position has been reached, the current delivered to the motor for braking is very substantially decreased. The electrical brake can optionally act on the brake caliper with a spindle and a linkage, the electric motor driving and braking the spindle.

Abstract: A golf car having a hydraulic fluid brake system. The hydraulic fluid brake system is implemented as a disk brake system which is responsive to hydraulic fluid pressure generated from a master cylinder. A brake pedal and associated linkage provides input to a master cylinder to generate a hydraulic fluid pressure to control a brake caliper assembly. The brake pedal has a range of travel, where a first portion of the range defines a service mode of operation and a second portion of the range defines a parking mode of operation. In the parking mode of operation, the brake pedal and linkage engages a detent to maintain application of the brake to provide a parking mode of operation. An accumulator in the brake system provides an input force to maintain hydraulic fluid pressure sufficient to retain a parking mode of operation.

Abstract: An electric parking brake assembly includes an electric motor having an output shaft, a control module coupled to the electric motor for controlling the electric motor and a transmission coupling a threaded lead screw to the output shaft of the electric motor. The transmission preferably includes a gear train having a plurality of helical gears and the lead screw and the output shaft are preferably coaxial. A stationary elongate guide shaft extends substantially parallel to and spaced apart from the lead screw. A drive nut has a lead screw bore threadably receiving the lead screw therein and a guide shaft bore slidingly receiving the elongate guide shaft therein. The drive nut also has a cable attachment for attaching a brake cable to the drive nut. The cable attachment has a central axis offset from a central axis of the lead screw and is preferably located midway between the lead screw bore and the guide shaft bore.

Abstract: A manual override mechanism for an electric brake includes a flexible cable having an elongate outer conduit and an elongate inner core extending within the conduit, a conduit end fitting secured to an end of the outer conduit, a housing located within the conduit end fitting and rotatable therein and a core end fitting secured to an end of the inner core. The core end fitting is located within the housing and is longitudinally movable from a first position to a second position such that the end of the inner core moves toward the end of the outer conduit. Preferably, a spring element biases the core end fitting into the second position. Movement from the first position to the second position engages the core with a connecting element such as a helical gear to operably connect the core to the electric parking brake for manual operation thereof.

Abstract: A parking braking system for a brake in a vehicle wherein, upon moving a parking brake selector to a park position, the brake is arranged to be mechanically locked or latched into place by means of a variable position park latch mechanism which is adapted to co-operate with an operating member of the brake so as to set the park load on the brake at a desired level. The parking braking system includes a control system which has a brake level determining means (134) to determine the brake load level at which the brake is to be parked and a control means (136) for controlling the actuation of the latching mechanism, or a combination of several latching mechanisms, to selectively maintain that brake load level during a parking phase. In order to determine the park load level to which the brake should be applied in a given situation, there is provided a static mode 1 which generates a signal representative of the static condition of the vehicle or a static compensation signal.

Abstract: A golf car having a hydraulic fluid brake system. The hydraulic fluid brake system is implemented as a disk brake system which is responsive to hydraulic fluid pressure generated from a master cylinder. A brake pedal and associated linkage provides input to a master cylinder to generate a hydraulic fluid pressure to control a brake caliper assembly. The brake pedal has a range of travel, where a first portion of the range defines a service mode of operation and a second portion of the range defines a parking mode of operation. In the parking mode of operation, the brake pedal and linkage engages a detent to maintain application of the brake to provide a parking mode of operation. An accumulator in the brake system provides an input force to maintain hydraulic fluid pressure sufficient to retain a parking mode of operation.

Abstract: Suggested is a disc brake for motor vehicles which can be actuated by means of an electric motor with the interconnection of a reduction gear and which includes a floating caliper with two friction linings arranged within the brake caliper so as to be displaceable therein. The reduction gear is constructed as a threaded roller drive with threaded roller recoil the axially displaceable spindle whereof brings one of the two friction linings into engagement with a brake disc. For the purpose of realizing a clamping or arresting function this invention suggests to provide a clamping or arresting device (34) cooperating with a rotating part (11) of the reduction gear (7) or with a part (21) having power-transmitting connection to the reduction gear (7) so as to lock the latter.

Abstract: A parking braking system in a vehicle not having EBS wherein, for parking braking, the brakes are arranged to be supplied with actuating fluid from a pressure source under the control of a manually operated electrical device and wherein, upon selecting parking braking by actuation of the electrical device, the brakes are arranged to be applied and mechanically locked or latched in place.

Abstract: A release device for a tandem axle of a semi-truck is a compressible piston and cylinder, with the piston rod extending out of one end of the cylinder and biased into an extended position by a biasing mechanism such as compressed gas in the cylinder. A latch on the cylinder is releasably engageable with an indent on the piston rod to hold it in a retracted position. A hook on the cylinder engages over the handle of a manual release rod for a truck tandem axle, with an enlarged head on the end of the piston rod bearing against part of the frame adjacent the release rod with the piston rod in the latched, retracted position. Release of the latch puts biasing force on the piston rod, urging the cylinder outwardly away from the frame to pull out the release rod.

Abstract: The invention relates to a parking brake system for motor vehicles. The system has an adjusting unit (9) comprising a motor-driven drive mechanism (10) in order to tighten or loosen an actuating pull (18, 19) of a brake device (7), whereby the drive mechanism (10) is drive connected to a component (5) which is mounted in a non-displaceable manner with regard to the longitudinal axis (6) such that it can rotate around said longitudinal axis (6). The component (5) is rotationally fixed to a telescopic device (4) arranged such that it can be displaced in the direction of the longitudinal axis (6). The axial length of the telescopic device (4) is increased or decreased according to the direction of rotation of the component (5), and each axial end (2, 3) of the telescopic device (4) is respectively connected to an actuating pull (18, 19) for a brake of the brake device (7) in an indirect or direct manner.

Abstract: A locking assembly for preventing accidental let out of a slack adjuster is provided wherein the slack adjuster includes an elongated hollow housing member and an elongated rod member mounted for reciprocal movement within the hollow housing member. At least a portion of the rod member extends outwardly from a first end of the slack adjuster and is movable in a lateral direction with respect to a longitudinal centerline of the hollow housing member. A rod weldment washer is secured to the rod member at a predetermined location intermediate each end thereof. This rod weldment washer is positioned within the hollow housing member such that a side edge thereof is a predetermined distance from an inner surface of a sidewall of the hollow housing member during normal operation of the slack adjuster.

Abstract: A golf car having a hydraulic fluid brake system. The hydraulic fluid brake system is implemented as a disk brake system which is responsive to hydraulic fluid pressure generated from a master cylinder. A brake pedal and associated linkage provides input to a master cylinder to generate a hydraulic fluid pressure to control a brake caliper assembly. The brake pedal has a range of travel, where a first portion of the range defines a service mode of operation and a second portion of the range defines a parking mode of operation. In the parking mode of operation, the brake pedal and linkage engages a detent to maintain application of the brake to provide a parking mode of operation. An accumulator in the brake system provides an input force to maintain hydraulic fluid pressure sufficient to retain a parking mode of operation.

Abstract: A parking lock for an agricultural implement, such as a baler, includes a force accumulator mechanism operatively installed between a setting apparatus and a lock member. A control mechanism is operable to apply a force on the lock member in the direction of the release when the setting apparatus is held in its transport position and the lock member is retained in the hold position. The control mechanism is also operable to move the lock member to the release position whenever the setting apparatus is held in the transport position and the lock member is released. The force accumulator can be a spring positioned between the setting apparatus and the lock member. A method of method of releasing a parking lock on an agricultural implement is also provided by which the setting apparatus is moved from the park position to the transport position to load the force accumulator.

Abstract: A rack mounted within the housing of a mechanical lock translates. The rack, which has a rectangular cross-section, has teeth along one surface. A toothed pawl pivots housing between a locked and unlocked position. The teeth on the pawl engage the rack teeth when the pawl is locked. The pawl has a window that receives a cam. The cam has a first surface that engages a surface of the window when the cam is in the locked position. In that position, the cam prevents pawl movement teeth away from the teeth on the rack. A second surface of the cam pushes against a different surface of the window when the cam is in the unlocked position. In that position, the cam disengages the pawl teeth from the rack teeth. The window has a chamfered surface to move the pawl to its locked position.

Abstract: An automatic stop mechanism for a rolling door includes two brake members mounted to the stop member which is removably engaged with the fixture, the stop member having a flange disengagably contacting the inclined flange to normally stop the rolling door, a handle pivotally connected to the fixture and connected to the first member and the second member so as to shift the stop member along the shaft of the motor, the two brake members each having a brake pad and located within the motor casing, when the rolling door runs downwardly fast and the normal stop mechanism fails, the two brake members are expanded due to the eccentric force to stop the door by the two brake pads contacting the motor casing.

Abstract: A locking device for a linear movement unit (1) ensures quick and precise locking by providing a guidance when two clamping members (9) pivot into a clamping position substantially free from any play. The guidance is provided by at least first and second guide surfaces (12, 13 or 14, 15) so that the clamping members engage a guide rod (4) simultaneously to lock the unit on it, thus avoiding any spluttering.

Abstract: A mechanically driven ratchet assembly which has a pawl gear attached to a rotationally biased shaft, a pawl assembly having a pawl tooth for engagement with a pawl gear, and a ratchet gear which alternately permits movement when driven by the pawl gear of the pawl assembly from a first position to a third position in which full rotation of the shaft, in the direction of the rotational bias, was permitted, and sequentially and alternatively permits rotation of the pawl assembly either from the first position to a second position where the pawl tooth remains engaged with the teeth of the pawl gear or to a third position where the pawl tooth is no longer engaged with the pawl gear.

Abstract: A shaft lock for an automobile with a steering column. The steering column has a gear rim thereon with teeth on its periphery and a hollow cylinder is attached to the car body. A magnetic piston is slidably received in a hydraulic cylinder having a piston rod extending from the magnetic piston to the gear rim. An electromagnet is supported on the hydraulic cylinder and adjacent to the magnetic piston so that the field from the electromagnet holds the piston rod teeth out of engagement with the teeth on the gear rim when the ignition of the motor is turned on. The motor has an oil system connected to the hydraulic cylinder to force the magnetic piston away from the gear rim when the motor has started. A helical compression spring is supported on the hydraulic cylinder which urges the magnetic piston from the gear rim and disengages the teeth on the piston rod from the teeth on the gear rim.

Abstract: A vehicle anti-theft device that blocks and unblocks the flow of hydraulic fluid between a vehicle's master brake cylinder and wheel brake cylinder. When the invention is in a fluid blocking position, it locks the brakes and prevents movement of the vehicle on its wheels. Conversely, when the invention is in the nonblocking position, the brakes are unlocked and the wheels turn freely as in normal operation. The anti-theft device can be deactivated within the vehicle or by remote control.

Abstract: A method for preventing unwanted rolling away of a stationary vehicle maintains a brake pressure in wheel brake cylinders. The brake pressure is maintained in dependence on the actuation of the brake pedal, and is maintained only if the current brake pressure exceeds a brake pressure corresponding to the holding pressure by a certain amount. This brake pressure can be applied at will by the driver.

Abstract: A brake pedal locking apparatus, the apparatus comprising a latching groove formed at a surface of a brake pedal; a hook device having a hook head for inserting into the latching groove to fix a brake pedal in its pushed position; a housing having a hook device receiving cavity therein and a penetrated hole for a hook device to protrude therethrough; a compression spring for pushing the hook device to protrude out of the penetrated hole; and an operational lever connected to the hook device by a wire for pulling the hook device into the housing.

Abstract: A combined service and parking brake includes a hydraulic actuating device (1) which has a brake cylinder (2) and a brake piston (3), and a hydraulically operable locking device (8) for fixing the brake piston (3) in the applied condition. According to the present invention, the locking device (8) is operable by a pressure impact through the hydraulic supply line (5) provided for service brake operations, and the pressure impact is in a pressure range that is above the pressure range provided for service brake operations.

Abstract: In a rodless cylinder unit with brake, which comprises a sliding table slidably held on a cylinder tube, brake bands inserted into the sliding table and both ends thereof fixed on both ends of the cylinder tube, and said sliding table provided with a brake for squeezing the brake bands, a slit with open upper end is formed on a side of the rodless cylinder of the cylinder tube, an air supply tube is accommodated in the slit, one end of the air supply tube is connected to the sliding table, and the other end of the air supply tube is connected to an end of the cylinder tube. When the air for brake release is supplied to the brake through the air supply tube, the brake is released, and the sliding table becomes movable. When the sliding table is moved, the air supply tube accommodated in the slit is overlapped or not overlapped with very low friction depending upon the moving direction of the sliding table.

Abstract: A lock system is disclosed for use on an in-line roller skate to positively lock the wheels. The lock system includes a mounting member for mounting the lock to the chassis of a roller skate. The mounting member includes a movable abutment member having a plurality of abutments for selective engagement with the wheels. The abutment member may comprise a plurality of spaced apart stops for interstitial between wheels to be locked. The arrangements have marked advantages over the existing systems in that the same are readily engagable with a minimum of effort. In this manner, the user can simply engage and disengage the lock device without any encumbrances typically associated with the prior art.

Abstract: A quick relief mechanism including a sleeve having an external circumferential groove and a locking ring located on the sleeve and sized to seat in the groove. The locking ring is split at one location to provide split-end portions, and a rotatable clamping device is provided with a recess for receiving the split-end portions. The recess has narrow and wide dimensions that serve to engage and disengage the split-end portions of the locking ring to effect closing of the locking ring in the circumferential groove when the clamping device is rotated to present a narrow dimension to the split-end portions, and to open the locking ring when the wide dimension of the elongated slot is presented to the split-end portions.

Abstract: A vehicle immobilizing system for engaging a brake pedal of a vehicle and locking the brakes of the vehicle in an activated position, but which does not interfere with the operation of the vehicle's brakes when the vehicle is being operated. The vehicle immobilizing system includes a standard vehicle brake pedal assembly, a retractable locking shaft, a solenoid, for extending and retracting the retractable locking shaft, a locking tumbler to prevent the retractable locking shaft from being physically forced open to deactivate the vehicle's brakes, and an activation switch for the immobilizing system. The retractable locking shaft is attached to the sidewall of a standard vehicle brake pedal assembly so as to prevent the upward movement of the brake pedal arm when the vehicle's immobilizing system is activated. Once the vehicle immobilizing system is activated all four (4) brakes of the vehicle will be locked and function as an anti-theft device.

Abstract: An electrical brake system for a motor vehicle is provided that may include an integrated electrical auxiliary brake. The wheel brakes of the brake system may be actuated via brake application devices. The internal friction can be selectively increased through an electrical auxiliary brake to create a self-locking of the brake application device with an increased brake application force.

Abstract: In a brake device of a linear moving body, a brake member is provided with a hole and a rod is fitted to the hole in clearance fit, and the brake member is moved slantwise and rotational moment is produced in the brake member thereby brake is applied to the rod in relative motion. The brake member is arranged movable slantwise using position as fulcrum remote from the axial center of the rod, and notched portions having width smaller than diameter of the hole are formed at symmetric positions within the hole along a plane including the fulcrum and the axial center of the rod. In this brake device, rotational force (rotational moment) is supplied to the brake member, and drag is produced at a fitting surface within the hole and frictional force due to the drag is made brake force and frictional force due to the drag of the fitting surface is made reaction force of the rotational force.

Abstract: A motorcycle disk brake lock comprises a main body and a locking tool. The main body is provided with a retaining slot, a first receiving cell, a through hole located between the retaining slot and the first receiving cell, and a recess located in the inner wall of the retaining slot such that the recess is opposite in location to the through hole. The locking tool is housed in the first receiving cell such that the lock core of the locking tool is capable of moving back and forth in the first receiving cell. The lock core is provided with a lock bolt which is fitted into a spring. The recess of the retaining slot is provided in the inner wall thereof with a first retaining portion engageable with a second retaining portion of the lock bolt.

Abstract: A parking brake system for use on a railway car includes an actuator which is adapted to be attached to a service brake actuating lever arm of the railway car and to receive a flow of non-compressible holding liquid from a reservoir through a first valve unit. The first valve unit permits the liquid to freely flow to and from the actuator in a first position and only permits flow of the liquid towards the actuator in a second position. With this arrangement, movement of the service brake actuating lever arm automatically causes the actuator to be supplied with holding liquid from the reservoir, which liquid can be selectively retained by shifting of the first valve unit to the second position. Furthermore in accordance with the invention, the actuator can be shifted by supplying pressurized holding liquid thereto through the use of a motor driven pump circuit including a pressurizable reservoir.

Abstract: Air pressure actuated and hydraulic applied railway car parking brake system includes air source to actuate. A control valve receives air from source to initiate air communication. Pneumatic to hydraulic pressure intensifier receives air in first chamber therein from valve. A second intensifier chamber is connected at open first end thereof with partially open second end of first chamber. Hydraulic fluid is disposed in second chamber adjacent closed second end thereof. A force transmitting cylinder, in fluid communication with second chamber, exerts force on brake beam carrying brake shoes thereon which are brought and maintained in frictional engagement with a respective surface of tread portion of a pair of wheels during system operation. A piston member, disposed for reciprocal movement in first chamber, is linearly displaced when a first surface thereof is acted on by air communicated to intensifier.

Abstract: A lock system is disclosed for use on an in-line roller skate to positively lock the wheels. The lock system includes a mounting member for mounting the lock to the chassis of a roller skate. The mounting member includes a movable abutment member having a plurality of abutments for selective engagement with the wheels. Hub projections are provided on the wheels for engagement with the abutment member. In another embodiment, the abutment member may comprise a plurality of spaced apart stops for interstitial between wheels to be locked. The arrangements have marked advantages over the existing systems in that the same are readily engagable with a minimum of effort. In this manner, the user can simply engage and disengage the lock device without any encumbrances typically associated with the prior art.

Abstract: A motorcycle rear wheel brake functions to allow the driver to lock the rear wheel on an upward incline. This prevents the motorcycle from rolling backwards while freeing the driver's hands and feet. A simple hinge arrangement wedges the rear wheel and the hinge into the rear fork. A solenoid activates the hinge. An alternate embodiment uses a mechanical cable to move the hinge.

Abstract: A forward-moving inching unit and a backward-moving inching unit are built in a casing (1) which is slidable relative to a guide member (b).

Abstract: The present invention relates to a jerk arresting mechanism to prevent the back rests of office chairs from unexpected movement such as rebounding and impacting upon users in an undesirable fashion. More generally, the mechanism described positively arrests an acceleration of one part moving relative to another part. This is accomplished in a housing fastened to one of the parts, wherein the mechanism resides, through which a spirally contoured shaft is passed that is connected to the other part. As the acceleration exceeds a predictable threshold, a nut with an outer toothed surface is axially translated relative to the shaft movement and engages a complementarily toothed surface integral with the housing. This engagement stops the rotational and linear movement of both the nut and shaft thereby arresting the movement of the parts relative to each other.

Abstract: A longitudinal locking mechanism in which a male lock member may be adjustably projected from a female lock member in the longitudinal direction thereof. The female lock member has a bellmouthed split end portion warped outwardly and radially relative to the central axis thereof. Such bellmouthed split end portion may be elastically closed by a slide ring for threaded engagement with the male lock member, so that a desired projection amount of the male lock member may be adjusted for locking purposes in a vehicle seat. The slide ring is biased in a direction to close the bellmouthed split end portion of female lock member, and may be drawn by an operation lever, via an actuation element, in a direction away from that bellmouthed split end portion so as to release the threaded enagement between the male and female lock members.

Abstract: The present invention provides a brake that allows an object to rotate continually through its full range of movement, but allows the object to be reliably secured at any position within this range. The object is carried by a brake that includes a deformable cylindrical collar and a lever. Normally, a spring exerts force against the lever, which in turn exerts pressure on the collar, causing the interior diameter of the collar to become smaller. The collar then grasps the rod and prevents the rotation of the brake relative to the rod. A pneumatically controlled piston counters the force of the spring to allow the brake to rotate freely.

Abstract: A lock apparatus selectively locks and unlocks a rotatable shaft from rotation. A brake disc is formed with opposed lock surfaces. First and second lock rings rotatably mounted on first and second bearing members are alternatingly moved by rotation along spaced projections on the adjacent first and second bearing members into locking engagement with the lock surfaces on the brake disc and away from the brake disc to an unlocked position. An outer member of each of the bearing members is held in a fixed position by engagement with first and second end caps mounted on the brake disc. An inner bearing member is axially movable with respect to the outer bearing member to bring bearings disposed in outer and inner races on the outer and inner bearing members into contact with thrust faces on the outer and inner members as axial force is imposed on the rotatable shaft to enable rotation of the shaft.

Abstract: This brake comprises a housing (1) intended to be mounted preferably close to the rear crossmember of the vehicle and which contains a gearwheel (2), a nut (3) fastened axially through the wheel, able to move in translation on either side thereof, and profiled so that it can be driven in rotation by the wheel, cables (8,9) connected to the braking members passing through the housing on each side of the nut and connected to the latter so that the rotation of the nut in one direction or the other gives rise to the application or release of the braking members; an electric motor (16) for driving the wheel in rotation is connected to a control button (17) which can be actuated from the driving position of the vehicle. This brake allows a gain in storage space and habitability of the vehicle, eliminates the need for adjustments upon assembly or during the life of the vehicle, guarantees a balanced distribution of the brake-application force between the two members and reduces the length of the cables.

Abstract: Disclosed is an air-applied, mechanically-held brake assembly and a vehicle air brake system employing the same. The air brake system typically includes a push-pull or hand-brake valve for park and emergency applications, a treadle valve for service applications, reservoirs of air under pressure, and other valving and plumbing. The brake assembly applies and releases the brake upon the supply and exhaust, respectively, of air from a first pressure chamber. The brake assembly locks and unlocks the brake in an applied position by the exhaust and supply, respectively, of air from a second pressure chamber. The locking mechanism of the brake assembly is designed to compound the force of the fluid pressure in the first pressure chamber with the force of the fluid pressure supplied to the second pressure chamber when unlocking the brake to compensate for back pressure.

Abstract: Apparatus for indicating the condition of hand brakes on railway cars and for applying and releasing railway car parking or hand brakes automatically in response to predetermined conditions including movement of a train, wayside conditioning apparatus, wayside operating mechanism, a signal controlled by an operator and performance of predetermined railway operating procedures, such as completion of an air brake test procedure. The apparatus may respond to mechanical, electrical and electronic signals and may operate on pneumatic or electric power provided from the service air brake system of a train or from a source of power outside of such air brake system.

Abstract: Apparatus for indicating the condition of hand brakes on railway cars and for applying and releasing railway car parking or hand brakes automatically in response to predetermined conditions including movement of a train, wayside conditioning apparatus, wayside operating mechanism, a signal controlled by an operator and performance of predetermined railway operating procedures, such as completion of an air brake test procedure. The apparatus may respond to mechanical, electrical and electronic signals and may operate on pneumatic or electric power provided from the service air brake system of a train or from a source of power outside of such air brake system.

Abstract: A locking unit for a motor which is to be locked in which a plurality of fingers at the ends of flexible arms, coupled to a locking motor, move into and out from engagement with a plurality of spaces bounded by ridges in a member which is connected to the shaft of the motor to be locked.

Abstract: A parking lock includes a support structure with steerable and rotatable wheels operatively mounted on the support structure. A locking wheel is operatively mounted on at least one of the steerable and rotatable wheel. A locking lever is pivotally mounted on the support structure. Receiving members are positioned on the locking wheel for operatively receiving the locking lever. A linkage is provided for operatively connecting the locking lever to the receiving members positioned on the locking wheel independently of the rotational and steering angle of the wheel.

Abstract: Lever-mounted brake pads are applicable to two non-swiveling wheels at the rear of a hand truck. The pads are normally spaced away from the wheel treads by return springs. A foot pedal at the front of the truck is operable between two positions, one of them being a "brake off" position, and the other being a "brake on" position. Cranks are connected to the pedal and have links and cables associated with them and with the brake pad levers whereby the pedal, operating through the cables, is useful to either simultaneously apply both brakes in one pedal position, or simultaneously release both brakes in the other pedal position. The return springs keep the cables taut when the brakes are off. An over-center arrangement on the cranks and links, together with an appropriately positioned stop in the "brake on" pedal position self-energizes to keep the brakes on until intentionally released.