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WO2000056592A1 - Soupape de reenclenchement pour mecanisme de blocage de soubassement de chassis de semi-remorque - Google Patents

Soupape de reenclenchement pour mecanisme de blocage de soubassement de chassis de semi-remorque Download PDF

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Publication number
WO2000056592A1
WO2000056592A1 PCT/US2000/000341 US0000341W WO0056592A1 WO 2000056592 A1 WO2000056592 A1 WO 2000056592A1 US 0000341 W US0000341 W US 0000341W WO 0056592 A1 WO0056592 A1 WO 0056592A1
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WO
WIPO (PCT)
Prior art keywords
valve
trailer
fluid
rod
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/000341
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English (en)
Inventor
James Gregory Copeland
Jesse W. Cervantez
Dane W. Gregg
Kevin Mark Mehigh
Phillippi Randsome Pierce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boler Co
Original Assignee
Boler Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boler Co filed Critical Boler Co
Publication of WO2000056592A1 publication Critical patent/WO2000056592A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D53/00—Tractor-trailer combinations; Road trains
    • B62D53/04—Tractor-trailer combinations; Road trains comprising a vehicle carrying an essential part of the other vehicle's load by having supporting means for the front or rear part of the other vehicle
    • B62D53/06—Semi-trailers

Definitions

  • the invention relates to semi-trailer subframes, and in particular to movable subframes for semi-trailers. More particularly, the invention is directed to a movable subframe for semi-trailers which in- eludes a retractable pin mechanism for locking the movable subframe in a selected position relative to the semi-trailer body, wherein the retractable pin mechanism is pneumatically actuated via an air-piloted reset valve which controls air supply to the mechanism, and further wherein the valve is integrated with the parking brake system of the vehicle to prevent or limit, when the pin mechanism is in an unlocked position, movement of the semi-trailer from a parked position.
  • Movable subframes typically referred to as sliders
  • One or more axle/suspension systems usually are suspended from a single slider structure.
  • the slider in turn is mounted on the underside of the trailer body, and is movable longitudinally therealong to provide a means of variable load distribution. More specifically, the amount of cargo that a trailer may carry is governed by local, state and/or national road and bridge laws, and is dependent on proper load distribution.
  • the basic principle behind most road and bridge laws is to limit the maximum load that a vehicle may carry, as well as to limit the maximum load that can be supported by individual axles.
  • a trailer having a slider gains an advantage with respect to laws governing maximum axle loads.
  • the retractable pin mechanism generally includes two or more, and typically four, retractable pins which may be interconnected by a usually manually or pneumatically actuated crank mechanism. When the pins are in their extended or outboardmost position, they each extend through a respective opening formed in the slider and a selected aligned one of a plurality of openings formed in the trailer body. The pins thereby lock the slider in a selected position relative to the trailer body. However, these pins can become jammed.
  • the mechanical advantage enjoyed by a manual operator of the pin mechanism is designed to overcome spring forces which bias the pins to the locked position, for retracting the pins when it becomes necessary to reposition the slider.
  • the mechanical advantage is not designed to free or retract jammed pins from their locked position. Since the mechanical advantage sometimes is inadequate, prior art slider pin mechanisms rely on either the brute force of the semi-trailer operator or add-on devices such as pneumatically actuated systems designed to release jammed pins. In assessing the reason for jammed pins, it has been discovered that shear forces are imposed on the individual pins. The shear forces operate in a direction perpendicular to the longitudinal axis of each cylindrical pin.
  • a typical method of attempting to release prior art jammed pin mechanisms is for the semi-trailer operator to rock the trailer fore-and-aft, while an assistant manually operates the retractable pin mechanism.
  • the rocking motion briefly realigns the misaligned openings, so that the assistant can retract the pins during the period of realignment.
  • the present invention significantly reduces or eliminates the risk of accidental separation of the movable subframe from the semitrailer by incorporating a three-way two-position air-piloted reset valve in the locking mechanism arrangement of parts, and by integrating that valve with the emergency or parking brake system of the semitrailer.
  • the operator engages the parking brake in the semi-trailer tractor cab, which in most conventional parking brake systems causes air to be ex- hausted from the parking brake air conduits.
  • the parking brake conduit system pneumatically communicates with the locking pin mechanism via the valve, and with the parking brake conduits being free of air and the parking brake set, the operator then can alight from the tractor cab and manually pull the knob of the valve to its outboard- most or open position.
  • the valve is designed so that when air pressure is present in the parking brake system conduits and enters the valve, such air pressure prevents or makes it very unlikely that the valve knob could be pulled, either intentionally or by accident, to its out- boardmost position to unlock the pins.
  • Such an arrangement of parts greatly reduces or eliminates the risk of the slider separating from the semi-trailer during over-the-road operation, because during such operation, the parking brakes obviously are disengaged and pressurized air is present in the parking brake system conduits.
  • the operator After repositioning of the slider, the operator then can push the valve into a closed position to block the supply of pressurized air to and to exhaust any air present in, the locking pin mechanism, to enable the spring bias of each of the pins to move its respective pin in the outboard direction to a locked position.
  • a second significant advantage to this arrangement of parts exists in that if the operator forgets to close or to push the valve back in after repositioning the slider, releases the parking brake and attempts to drive away, the influx of pressurized air into the valve caused by releasing the parking brake automatically forces the knob to move to its inboardmost or closed position. The pressurized air present in the locking pin mechanism then is released to enable the spring bias of the pins to immediately move the pins to the locked position.
  • the air- piloted reset valve locking pin mechanism of the present invention greatly reduces if not completely eliminates the risk of accidental separation of the semi-trailer from its movable subframe.
  • Objectives of the present invention include providing an air- piloted reset valve locking mechanism for semi-trailer subframes, which prevents or greatly reduces the risk of disengagement of the subframe from the semi-trailer during operation of the semi-trailer over-the-road, as well as at the initiation of operation of the semi-trailer when the operator fails to lock the pin mechanism after repositioning the subframe.
  • Another objective of the present invention is to provide such an air-piloted reset valve locking mechanism for semi-trailer subframes, which is economical, durable in use, and easy to install, maintain, and use.
  • the air- piloted reset valve locking mechanism for semi-trailer subframes including a retractable locking pin mechanism of a subframe structure for a vehicle trailer, the sub- frame structure being movably mountable on spaced-apart, parallel elongated rails mounted on the bottom of the trailer, the trailer rails each being formed with a plurality of openings, the subframe structure including a pair of spaced-apart, parallel elongated main members, the main members each including means for movably engaging a respective one of the trailer rails, at least one of the main members further being formed with at least one locking pin opening, the main member opening being selectively alignable with its respective trailer rail openings, for passage of a generally complementary-sized and shaped locking pin through the respective aligned openings for locking the subframe structure in a selected position relative to the vehicle trailer, the retractable locking pin mechanism including means for extending the pin to a locked position and a fluid actuated retraction mechanism for retracting
  • FIG. 1 is a fragmentary perspective view, with portions broken away and shown in broken lines, of a slider for semi-trailers, showing the air-piloted reset valve locking pin mechanism of the present invention installed on the semi-trailer slider;
  • FIG. 2 is a fragmentary elevational view of the semi-trailer slider incorporating the air-piloted reset valve locking pin mechanism of the present invention, with portions broken away, and showing only one of two axle/suspension systems which depend from the slider, with a wheel, portions of the suspension system, and a trailer rail depending from a trailer body on which the slider is movably mounted, shown in broken lines;
  • FIG. 3 is a fragmentary top plan view, with portions broken away and shown in broken lines, of the slider incorporating the air- piloted reset valve locking pin mechanism of the present invention shown in FIG. 2;
  • FIG. 4 is a perspective view of the three-way two-position reset valve useful in the present invention, and showing a bracket incor- porated on the valve for mounting the valve on a slider;
  • FIG. 5 is a sectional view taken along lines 5-5 of FIG. 4, with portions broken away and shown in broken lines, and showing the valve with fittings mounted in the valve ports for fluid communication between the valve ports and conduits attached to the fittings, and dia- grammatically showing fluid communication between the valve and a source of pressurized air, and further showing the valve in a closed or inboardmost position in which the flow of pressurized air to the locking mechanism is blocked to enable the pins to be biased to an outboard- most or locked position;
  • FIG. 6 is a sectional view similar to FIG. 5, but showing the valve in an open or outboardmost position, wherein pressurized air is free to flow to the locking mechanism to overcome the outboard bias of the pins to retract or unlock the pins;
  • FIG. 7A is an enlarged fragmentary front view, with portions broken away, of the reset valve and associated parts of the retractable locking pin mechanism of the present invention, showing the knob of the valve pushed to its inboardmost or closed position and the pins in an extended locked position;
  • FIG. 7B is a fragmentary top plan view, with portions broken away and shown in broken lines, of the arrangement of parts shown in FIG. 7A;
  • FIG. 8A is a view similar to FIG. 7A, but showing the knob of the valve pulled to its outboardmost or open position, causing pneumatic actuation of the locking mechanism and retraction of the pins to an unlocked position; and
  • FIG. 8B is a fragmentary top plan view, with portions broken away and shown in broken lines , of the arrangement of parts shown in
  • FIG. 8A is a diagrammatic representation of FIG. 8A.
  • Slider 1 0 includes a pair of main members 1 1 , 1 1 ', front and rear generally K-shaped cross member structures 1 2A and 1 2B, respectively, front and rear pairs of hangers 1 3A and 1 3B, respectively, for suspending axle/suspension systems, and the improved air-piloted reset valve retractable locking pin mechanism of the present invention 14.
  • each main member 1 1 1 , 1 1 ' is an elongated, generally C-shaped beam made of a metal such as steel or other suitable material.
  • the open portion of each main member 1 1 , 1 1 ' is opposed to the open portion of the other main member and faces inboard relative to slider 10.
  • Main members 1 1 , 1 1 ' are connected to each other in spaced-apart parallel relationship by K-shaped cross member structures 1 2A, B.
  • Each K-shaped cross member structure 1 2 includes a base member 1 6 which extends between and is perpendicular to main members 1 1 , 1 1 ' (FIGS. 1 and 3). The open portion of each base member 1 6 faces in a frontward direction.
  • Each end of base member 1 6 nests in the open portion of a respective one of main members 1 1 , 1 1 ', and is secured therein by any suitable means such as welding or mechanical fastening.
  • Each base member 1 6 is a generally C-shaped beam made of a metal such as steel or other suitable material.
  • Each front hanger 1 3A is attached by welding or other suitable means, to the lowermost surface of a respective one of main members 1 1 , 1 1 ' at a location directly beneath base member 1 6 of front K-shaped cross member structure 1 2A.
  • Each rear hanger 1 3B similarly is attached at a location directly beneath base member 1 6 of rear K-shaped cross member structure 1 2B.
  • Each K-shaped cross member structure 1 2 further includes a pair of inclined members 1 7, each of which is a generally C-shaped beam also made of a metal such as steel or other suitable material.
  • the open portion of each inclined member 1 7 faces in an outboard-frontward direction, and each of the inclined members extends between generally the middle portion of base member 1 6 and a respective one of main members 1 1 , 1 1 '.
  • each inclined member 1 7 is attached at an angle to the rearwardmost surface of base member 1 6 by any suitable means such as welding or mechanical fastening, and a rear end of each of the inclined members is nested at an angle in the open portion of a respective one of main members 1 1 , 1 1 ', and also is at- tached thereto in any suitable manner such as by welding or mechanical fastening.
  • An optional reinforcement bar 1 8 which extends between the rearwardmost ends of main members 1 1 , 1 1 ' , adds additional strength to the structure, and is attached thereto by any suitable means such as welding or mechanical fasteners.
  • One or more openings 1 9 are formed in the vertically extending surface of each base member 1 6 and each inclined member
  • Each main member 1 1 , 1 1 ' has a pair of rail guides 25 mounted on its outboard surface by bolts 26 (FIGS. 1 to 3). Each rail guide 25 is mounted adjacent to a respective one of the ends of main members 1 1 , 1 1 '.
  • a low friction strip 27 is attached to the uppermost surface of each main member 1 1 , 1 1 ' by recessed fasteners 28, and extends generally the entire length of the main member. Strip 27 is formed of any suitable low-friction material, such as ultra-high molecular weight polyethylene.
  • slider 10 incorporating improved air-piloted reset valve retractable locking pin mechanism 14 of the present invention supports front and rear axle/suspension systems.
  • front axle/suspension system 30 is shown in the drawings and described herein since the front and rear systems are identical in structure and operation. Moreo ⁇ ver, inasmuch as axle/suspension system 30 is suspended from slider 10, but does not form an integral part thereof, only the major components of system 30 will be cited for aiding in the description of the environment in which the slider incorporating the improved air-piloted re- set valve retractable locking pin mechanism 14 of the present invention operates.
  • Axle/suspension system 30 includes generally identical suspension assemblies 31 suspended from each hanger 13A of the pair of front hangers.
  • a reinforcement box 1 5 is mounted by any suitable means in the open portion of each main member 1 1 , 1 1 ' frontward of and adjacent to each end of each of base members 1 6, to provide additional strength to slider 10 for supporting hangers 13A, B, and their associated suspension assemblies 31 .
  • Each suspension assembly 31 includes a suspension beam 32 which is pivotally mounted on hanger 1 3A in a usual manner.
  • An air spring 33 is suitably mounted on and extends between the upper surface of the rearwardmost end of suspension beam 32 and main member 1 1 , 1 1 ', at a location directly beneath the outboard end of a respective one of inclined members 1 7 of K- shaped cross-member structure 1 2A.
  • a shock absorber 34 extends be- tween and is mounted on suspension beam 32 and the respective inclined member 1 7.
  • Another component of suspension assembly 31 is an air brake 35.
  • An axle 36 extends between and is captured in the pair of suspension beams 32 of axle/suspension system 30.
  • One or more wheels 38 are mounted on each end of axle 36.
  • Slider 1 0 is movably mounted on trailer body 40 by slidable engagement of rail guides 25 with spaced-apart, parallel and generally Z-shaped rails 41 (FIG. 2), which are mounted on and depend from the underside of the trailer body.
  • Each low friction strip 27 abuts the bot- torn surface of the uppermost portion of a respective one of rails 41 to provide a smooth, generally friction-free contact surface for slidable movement of slider 1 0 on trailer body 40.
  • slider 10 can be selectively positioned relative to trailer body 40 for optimum load distribution by improved air-piloted reset valve retractable locking pin mechanism 14 of the present invention.
  • pin mechanism 14 includes an elongated pivot rod 45 which passes rearwardly through an aligned pair of openings (not shown) formed in base member 16 and a predetermined one of inclined members 1 7 of front K-shaped cross member 1 2A adjacent to main member 1 1 .
  • a pivot rod support 57 is securely mounted, such as by welding, on frontwardmost reinforcement box 1 5 of main member
  • Pivot rod support 57 maintains the position of pivot rod 45 relative to the other parts of locking pin mechanism 14, by preventing excessive outboard, inboard or vertical movement of the pivot rod, which otherwise could prevent smooth operation of the mechanism.
  • a lever 43 is attached (FIGS. 1 ,
  • pivot rod 45 adjacent to the front end of the rod and frontwardly adjacent to base member 1 6 of front K-shaped cross member 1 2A.
  • a first end of an elongated arm 44 is pivotally attached by any suitable means to a lower end of lever 43.
  • a second end of arm 44 is pivotally attached by any suitable means to the inboard end of a pin 49 disposed adjacent to opposite main member 1 1 '.
  • An upper end of lever 43 is pivotally attached by any suitable means to the inboard end of a pin 59 disposed adjacent to main member 1 1 .
  • a lever 47 similarly is attached to pivot rod 45 adja- cent to the rear end of the rod and frontwardly adjacent to base member 1 6 of rear K-shaped cross member 1 2B.
  • a first end of an elongated arm 48 is pivotally attached to a lower end of lever 47.
  • a second end of arm 48 is pivotally attached to the inboard end of a pin 69 disposed adjacent to opposite main member 1 1 '.
  • An upper end of lever 47 is pivotally attached to the inboard end of a pin 79 disposed adjacent to main member 1 1 .
  • each pin 49, 59, 69, 79 is slidably mounted (FIGS. 1 , 3, 7A and 7B) in an opening (not shown) formed in a bracket 51 which is attached by suitable means such as welding to a respective one of base members 1 6.
  • An enlarged outboard end of each pin 49, 59, 69, 79 passes through an opening 52 (see also FIG. 2) formed in a respective one of main members 1 1 , 1 1 '.
  • the above-described arrangement of parts including levers 43, 47, elongated arms 44, 48, pivot rod 45, and pins 49, 59, 69, 79, can be pneumatically actuated via a three-way, two-position air-piloted reset valve 60 (FIGS. 4 and 5) of a type which is well known in the valve art.
  • valve 60 includes a cylinder 61 formed with a chamber 62 and ports 63, 64, 65, and 66.
  • a piston or spool 67 is seated in chamber 62 and sealed by a pair of spaced-apart O-rings 68.
  • Piston 67 is movable from a closed or inboardmost position shown in FIG. 5 to an open or outboardmost position shown in FIG. 6 by a rod 58 which is attached by any suitable means, such as threadable engagement, to piston 67.
  • Rod 58 extends outwardly from chamber 62 and through an outboard end of cylinder 61 via an opening 70 formed in and passing completely through the cylinder end.
  • the outboard end of rod 58 includes a knob 71 mounted thereon by any suitable means, such as threadable engagement, to facilitate manual actuation of valve 60, as will be described in greater detail below in the description of the operation of air-piloted reset valve re- tractable locking pin mechanism 14.
  • Rod opening 70 is sealed by an O- ring 72.
  • An L-shaped bracket 73 is captured by lock nut 85 on valve cylinder 61 , and the L-shaped bracket in turn is mounted by any suitable means on the lowermost surface of main member 1 1 adjacent to and frontward of hanger 1 3A (FIG. 7A). More specifically, valve 60 is oriented on main member 1 1 so that knob 71 is disposed in an outboard direction to enable easy grasping of the knob for operating retractable pin mechanism 14 of the present invention.
  • a first end of a conduit 75 (FIGS. 5, 7A and 7B) is attached to and communicates with port 63 and an outboard portion of chamber 62 via a fitting 76. Conduit 75 also is attached at its second opposite end and communicates with the emergency or parking brake air supply of the semi-trailer.
  • An exhaust tube 77 is attached to and communicates with port 64 and in inboard portion of chamber 62 via a fitting 78.
  • a first end of conduit 74 is attached to and communicates with port 65 and a central portion of chamber 62 via a fitting 80.
  • Conduit 74 also is attached at its second opposite end and communicates with a tank 81 containing a pressurized air supply.
  • a usual two-way pressure protection valve 84 is interposed between valve 60 and tank 81 in conduit 74 to ensure that adequate pressure is maintained in the tank.
  • a first end of a conduit 82 is attached to and communicates with port 66 and a central portion of chamber 62 via a fitting 83.
  • Conduit 82 also is attached at its second opposite end and communicates with an air actuator 90 of a type which is well known to the art and to the literature.
  • Air actuator 90 is securely mounted on a bracket 91 (FIGS. 1 , 3, 7A, and 7B) by any suitable means such as nuts 97, and the bracket in turn is mounted on the front surface of base member 1 6 of front K- shaped cross member 1 2A by any suitable means such as welding.
  • a piston rod 92 of air actuator 90 extends outboardly toward pivot rod 45 from the air actuator through an opening 98 formed in bracket 91 .
  • the outboard end of piston rod 92 is pivotally attached by suitable means to a bracket 93 which in turn is immovably mounted, such as by welds, frontwardly adjacent to lever 43 on pivot rod 45.
  • Improved air-piloted reset valve retractable locking pin mechanism 14 of the present invention useful in slider 10 of a semi-trailer is operated in the following manner. When it is desired to lock slider 10 in a selected position relative to trailer body 40, main member openings
  • valve 60 is in the position shown in FIG. 5, in which the pressurized air supply to air actuator 90 is exhausted through conduit 82, port 66, chamber 62, and out of port 64 through exhaust tube 77.
  • each coil spring 56 is free to operate without being overcome by any air pressure forces (FIGS. 1 , 3, 7A and 7B).
  • the parking brake of the trailer is engaged and air is exhausted from parking brake conduit 75.
  • This exhausting of air enables knob 71 to be manually pulled outboardly by the semi-trailer operator, since there is no air pressure in the parking brake conduit (not shown), or in conduit 75, port 63, or the outboard portion of chamber 62, to prevent such pulling of the knob and attached rod 58 and piston 67.
  • Manually moving piston 67 to its outboardmost position shown in FIG. 6 enables pressurized air from dedicated air supply tank 81 to travel through conduit 74 and pressure protection valve 84, and into inlet port 65, through chamber 62, out of outlet port 66, through conduit 82, and into air actuator 90.
  • This supply of air to air actuator 90 in turn causes movement of piston rod 92 in an outboard direction to rotate bracket 93 and pivot rod 45 in a counterclockwise direction, when viewed from the front of slider 10 (compare FIGS.
  • slider 1 0 can be selectively adjusted by moving the slider longitudinally along rails 41 be- neath trailer body 40, until main member openings 52 align with selected rail openings 55 and pins 49, 59, 69, 79 engage therewith as described hereinabove for maximizing load distribution.
  • Knob 71 then can be manually pushed to its inboardmost position by the semi-trailer operator to in turn push rod 58 and piston 67 to their inboardmost position shown in FIG.
  • Knob 71 , rod 58, and piston 67 all are re- tained in this inboardmost position by the engagement of detent 99 with a second groove 95 formed in rod 58.
  • the pins will nonetheless automatically be enabled to lock upon release of the parking brake by the operator just prior to initiating movement of the semi-trailer. More particularly, upon release of the parking brake, the parking brake conduit fills with pressurized air, and in turn, pressurized air is introduced into conduit 75, port 63, and the outboard portion of chamber 62 to overcome the bias of detent 99 and automatically force piston 67 to reset to its inboardmost position shown in FIG. 5.
  • the pressurized air present in actuator 90 then is released from exhaust tube 77 to enable the bias of coil springs 56 to force the pins to the extended or locked posi- tion.
  • Another of the features and advantages of the above-described arrangement of parts of the present invention is that the risk of movement of piston 67 from its inboardmost position shown in FIG. 5 to its outboardmost position shown in FIG. 6 during over-the-road operation of the semi-trailer, whereby pressurized air is supplied to actuator 90 to retract or unlock the pins, is unlikely. More specifically, during over-the- road operation of the semi-trailer, the parking brake is in a released state and air is present in the parking brake system, as well as being present in conduit 75, port 63, and the outboard portion of cylinder chamber 62.
  • valve piston 67 This pressurized air, together with detent 99 engaged with groove 95, which provides minor resistance, effectively prevents or reduces the risk of movement of piston 67 in an outboard direction which would result in accidental unlocking of the pins.
  • valve piston 67 could be reversed without affecting the overall concept of the present invention, namely, the pins could be locked when piston 67 is in the outboardmost position and unlocked when the piston is pushed to its inboardmost position, but it is believed that the arrangement of parts shown and described herein provides a higher degree of actual and psychological safety, inasmuch as it is conceivable that an extremely hard blow applied to knob 71 during the operation of the semi-trailer, if the pins are locked when knob 71 is pulled out, could cause knob 71 to depress and unlock the pins.
  • the present invention contemplates the following modified arrangement of parts and operation to achieve the objectives enumerated above.
  • the operator applies the vehicle parking brake which in turn causes evacuation of air from the parking brake system.
  • the operator then manually moves a switch, preferably located in the tractor-trailer cab, to the on position to remotely energize a solenoid valve causing the valve to open and allowing air to flow to actuator 90 and retracting the pins.
  • the switch After repositioning of the slider, the operator then manually moves the switch to the off position to deenergize the solenoid valve.
  • the piston of the valve is spring-biased to the closed position, so that upon such deenergization the valve automatically closes, enabling the pins to automatically extend to the locked position.
  • an air pressure switch which is in communication with the parking brake system, senses the return of air to the system and deenergizes the solenoid valve enabling the pins to lock.
  • the air pressure present in the parking brake system will overcome the solenoid energization force which moves the valve to the open position, and will cause the valve to close enabling the pins to lock.
  • the improved air-piloted reset valve retractable locking pin mechanism 14 of the present invention overcomes disadvantages of various prior art pneumatic locking pin mecha- nisms which bear a higher risk of being accidentally actuated to cause separation of the slider from the semi-trailer during over-the-road operation of the semi-trailer, as well as separation of the slider from the semitrailer when the operator of the semi-trailer initially drives off after releasing the parking brake, but having forgotten to reengage the locking pins.
  • the improved air-piloted reset valve locking mechanism for semi-trailer sliders is simplified, provides an effective, safe, inexpensive, and efficient system which achieves all the enumerated objectives, provides for eliminating difficulties encountered with prior semi-trailer slider locking mechanisms, and solves problems and obtains new results in the art.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

L'invention a trait à une soupape (60) à commande pneumatique destinée à actionner par voie pneumatique un ensemble d'un mécanisme d'axes (59) afin de bloquer un soubassement de châssis mobile (10) dans une position sélectionnée par rapport à la semi-remorque. Lorsque la semi-remorque est en stationnement et que le frein de stationnement est actionné, de l'air sous pression est évacué du système de frein de stationnement et de la soupape. Le manque d'air dans la soupape permet à un utilisateur de la semi-remorque d'ouvrir manuellement la soupape, ce qui permet à l'air d'une source spéciale de passer à travers la soupape et de débloquer les axes. Après repositionnement de la coulisse sous le corps de la semi-remorque, l'utilisateur ferme manuellement la soupape, évacuant ainsi l'air du mécanisme de blocage via la soupape et permettant le blocage automatique des axes.
PCT/US2000/000341 1999-03-22 2000-01-07 Soupape de reenclenchement pour mecanisme de blocage de soubassement de chassis de semi-remorque Ceased WO2000056592A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27379199A 1999-03-22 1999-03-22
US09/273,791 1999-03-22

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WO2000056592A1 true WO2000056592A1 (fr) 2000-09-28

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PCT/US2000/000341 Ceased WO2000056592A1 (fr) 1999-03-22 2000-01-07 Soupape de reenclenchement pour mecanisme de blocage de soubassement de chassis de semi-remorque

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003020561A1 (fr) * 2001-09-06 2003-03-13 Daxrose Pty Ltd Systeme de verrouillage de securite de plaque tournante
WO2021066826A1 (fr) 2019-10-03 2021-04-08 Hendrickson Usa, L.L.C. Enveloppe pour un composant de véhicule utilitaire lourd

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5620195A (en) * 1992-12-24 1997-04-15 Rocky Mountain Technology Engineering Corp. Locking system for a semitrailer sliding undercarriage with air pressure protection valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5620195A (en) * 1992-12-24 1997-04-15 Rocky Mountain Technology Engineering Corp. Locking system for a semitrailer sliding undercarriage with air pressure protection valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003020561A1 (fr) * 2001-09-06 2003-03-13 Daxrose Pty Ltd Systeme de verrouillage de securite de plaque tournante
WO2021066826A1 (fr) 2019-10-03 2021-04-08 Hendrickson Usa, L.L.C. Enveloppe pour un composant de véhicule utilitaire lourd

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