US3186308A - Hydraulic rams - Google Patents

Hydraulic rams Download PDF

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Publication number
US3186308A
US3186308A US157428A US15742861A US3186308A US 3186308 A US3186308 A US 3186308A US 157428 A US157428 A US 157428A US 15742861 A US15742861 A US 15742861A US 3186308 A US3186308 A US 3186308A
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ram
detent
piston
movement
diameter
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Butterworth Archibald James
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S9/00—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks
    • B60S9/14—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for both lifting and manoeuvring
    • B60S9/205—Power driven manoeuvring fittings, e.g. reciprocably driven steppers or rotatably driven cams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S9/00—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks
    • B60S9/14—Ground-engaging vehicle fittings for supporting, lifting, or manoeuvring the vehicle, wholly or in part, e.g. built-in jacks for both lifting and manoeuvring
    • B60S9/205—Power driven manoeuvring fittings, e.g. reciprocably driven steppers or rotatably driven cams
    • B60S9/21—Power driven manoeuvring fittings, e.g. reciprocably driven steppers or rotatably driven cams comprising a rotatably driven auxiliary wheel or endless track, e.g. driven by ground wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type

Definitions

  • This invention relates to hydraulic rams of the kind comprising a number of nested tubular piston parts which can telescope into and out of one another in a fluid tight manner, and means embodying a control valve for introducing fluid under pressure into the interior of the assemblage whereby the tubular parts may be forced apart.
  • tubular parts are contracted and nested together either by spring means in the case of a single acting ram or by fluid pressure in the case of a double acting ram and they are then extended by fluid pressure by appropriate actuation of the valve H means.
  • the parts which move first are those having the largest areas exposed to the fluid pressure.
  • An object of this invention is to provide for these conditions.
  • the invention is particularly applicable to parking devices for motor vehicles where ground engaging rollers are moved .by rams into engagement with the ground lifting the road wheels and which rollers engage the road wheels by which they are driven and in rolling along the ground swing an end of the vehicle sideways.
  • a hydraulic ram of the kind referred to is characterised in that detent means are provided for holding the ram parts, except the smallest ram parts, in their contracted condition, which detent means are so arranged that when pressure is generated within the ram, movement is first imparted to the smallest ram part and which movement is arranged to release the detent between the next larger parts so that they extend under continued pressure of the fluid until a complete extension of the assemblage is effected.
  • the movement of the smallest ram part may be arranged bo-th to release the detent means between the next larger parts of the ram and to engage detent means with the smallest part, where-by when the larger parts are expanded by hydraulic pressure against the working load, the smallest part will be prevented mechanically from contracting again under the axial load which will now be greater than it can sustain hydraulically, owing to its small area.
  • One and the same detent element which is movably mounted on one part of the ram, may be engageable with a socket on one or other of two other parts of the ram.
  • FIGURES 1 and 2 are elevations of one part of a rear axle of a vehicle looking from the front thereof and showing a hydraulic rain for moving a ground engaging roller into and out of engagement with the road and vehicle wheel, FIGURE 1 showing the ram in an extended condition and FIGURE 2 in a contracted condition;
  • FIGURE 3 is a section through one form of ram according to this invention and mounted on the rear axle of the vehicle in a somewhat different manner to that shown in FIGURES l and 2;
  • FIGURE 3A is an enlarged View of a part of the upper end of the ram shown in FIGURE 3;
  • FIGURE 4 is a part section and part elevation showing the parts of the ram of FIGURES 3 and 3A in a contracted condition;
  • FIGURE 5 is a diagramamtic face view of a disc from which the detent plungers are formed
  • FIGURE 6 is an enlarged view similar to that of FIG- URE 3A showing a modified and preferred form of detents and detent retaining rings;
  • FIGURE 7 is a section on the line 77 of FIGURE 6;
  • FIGURE 8 is a similar view to FIGURE 7 showing the slots in the end of one of the ram parts
  • FIGURE 9 is a section through two parts of the ram showing an alternative form of detent mechanism
  • FIGURE 10 is a section through the ram in a contracted condition showing yet a further alternative form of detent mechanism
  • FIGURE 11 is an enlarged sectional view of the ram shown in FIGURE 10 and showing parts thereof in the fully extended position;
  • FIGURE 12 is a similar View to that of FIGURE 11 showing yet a further form of detent mechanism.
  • FIGURE 13 is a side view of an arrangement for interlinking the control valve for the rams with the throttle for the vehicles engine.
  • FIGURES l and '2 show the kind of vehicle parking apparatus to which the invention may be applied, the vehicle being provided with a comparatively small capacity engine driven pump which supplies hydraulic fluid to the hydraulic rams associated with say the two rear wheels of the vehicle which hydraulic pump and rams are arranged in closed circuit with a reservoir for the fluid and valve control mechanisms.
  • FIGURES 1 and 2 show the manner in which a ram assemblage may be mounted on the vehicle and for this purpose a conventional ram assemblage is illustrated. Should, however, a ram assemblage according to the present invention be employed, the smallest part of the ram assemblage would be arranged uppermost and the intermediate sized part would be arranged lowermost as in FIGURE 3.
  • a ram 1 is surrounded by a protective bellows 2 or cover which may be of synthetic rubber and which may also enclose or incorporate a tension spring 3.
  • the lower element 4 of the ram 1 is rigidly attached to a roller mounting 5 which may be a high duty iron casting.
  • the mounting 5 carries a roller 6 in bearings not shown in this view.
  • a fore and aft extending horizontal pivot pin 15 passing through a part of the mounting 5 secures it to the lower end of a link 7.
  • the upper end of this link is similarly pivoted at 11 on a stationary portion of the rear wheel mounting 8.
  • the Vehicle shown has independent suspension by means of a lower wish bone 9 and transverse leaf spring 19 in known manner.
  • valve 166 is arranged to be under the joint control of a manipulating shaft 167, the pressure of fluid in the valve casing and an electrical device controlled in accordance with the speed of the vehicle, the operation of which device releases a detent enabling the valve 166 to be manually operated.
  • the operation of valve 166 is explained in US. patent application Ser. No. 801,254, filed March 23, 1959.
  • manipulating shaft 167 may be connected to the throttle valve of the engine carburetor as explained later.
  • FIGURE 2 shows this construction in the retracted position. It will be seen that the link 7 now lies in a substantially horizontal position, and that when the wheel and hub assembly rise and fall due to the action of the road upon the vehicles springs this link will idle like a normal suspension link without appreciably disturbing the position of the ram and roller assembly to which it is attached.
  • spring means other than said spring 3 may be used to withdraw the roller 6 from its operating position and bring the equipment to the fully retracted position shown in FIGURE 2.
  • a double-acting ram system may be used so that retraction as well as extension is performed hydraulically.
  • FIGURES 3, 3A, 4, 5, 6, 7 and 8 which provides a special form of two stage ram wherein a small diameter first stage is constrained to operate first so as to bring the rollers near to the road very quickly.
  • an interlock mechanism permits the activation of the main or Working pistons, which then raise the vehicle and push the parking rollers into contact with the road wheels.
  • This form of the invention has the additional advantage that the volume of fluid required to be disposed in operating the parking equipment is greatly reduced, so that a small pump may be employed with resulting economy and reduction in the stress on the pump drive. 7
  • a vehicle rear axle casing 39 carries a wheel 40 and a brake back-plate 41 is secured to a flange 42 on the casing 39 by bolts 43.
  • Axle casing 39 is secured to the road springs 44 by U-bolts 45 and spring plate 46.
  • An extension of the latter carries a tubular bearing housing (not shown) in which is installed the link 47 of the parking device. Acting about the upper pivot of this link is a retraction spring 48 having an anchorage 49.
  • a ground engaging roller 52 is mounted in bearings (not shown) in base casting 50.
  • Another face 53 of base casting 50 is bored to accept the threaded stud 54 of a lower ram piston 55.
  • Piston 55 Sandwiched between piston 55 and face 53 is a pressing 56 carrying on its upper lip the lower end of extensible bellows 57, which may be of synthetic rubber.
  • a dowel 58 prevents a lower ram piston 55 from rotating relative to casting 50.
  • Lower ram piston 55 is secured to base casting 50 by nut and washer 60 and 59.
  • the piston 55 carries oil seals 61.
  • Piston 55 is of generally tubular construction and the lower end of its bore may be tapered so as to thicken the walls for greater strength.
  • the upper part of this bore is formed with a recess 61a whose upper face 62 is arranged at a suitable angle to form a sliding contact with interlock plungers 63, hereinafter described, and which are carried at the upper end of a cylinder 64 in which the piston 55 slides.
  • the travel of the piston 55 is limited at its lower extremity by shoulder 65 on the cylinder 64.
  • Suitable spanner slots 66 are provided at the lower end of cylinder 64.
  • the bore 64A of the shouldered portion below shoulder 65 is an easy sliding fit for the outside diameter of piston 55, and the main bore 67 of cylinder 64 is an easy sliding fit for an enlarged head 68 at the upper end of the ram piston 55.
  • the upper end of cylinder 64 is formed with internal threads 69 and a short plain portion 70 above this thread.
  • the mouth of this plain portion is slightly chamfered at a suitable angle to accept an O ring type seal 71 fitted to a plug 72 which is in screw threaded engagement with the internal threads 69 of the cylinder 64.
  • An upper ram piston 73 which is provided with an axial passage 90, slides in a bore 72A in the plug 72.
  • the plug 72 also has formed on it a plain portion above the external threads which engage with threads 69 and a shallow shoulder 74.
  • the piston 73 has its movement in relation to plug 72 limited by a circlip 75 fitted in a groove near the lower end thereof.
  • a groove 91 similar in section to the recess 61a mentioned in lower piston 55.
  • This again is suitably shaped to accept detent plungers 63 which are slidable in radially extending slots in the plug 72.
  • the upper piston 73 is retained in its extended position because its retraction is prevented by the plungers 63 which are in interlocking engagement with the groove 91 in the piston 73.
  • the plungers are themselves prevented from escaping outwards by retaining ring 76.
  • This ring surrounds the inner cylindrical portion 77 of plug 72, and the upward part of its inside diameter is an easy sliding fit thereon. This diameter, however, is such that it cannot pass over the outer surfaces of interlock plungers 63.
  • the lower part 76a of the inside diameter of retaining ring 76 is, however, an easy fit over the interlock plungers 63 and the two differing bores 76b, 76c of this ring 76 are joined by a shallow step 76d formed at the same angle asthe outer chamber 63a of the plungers.
  • the plungers 63 have parallel sided sections which may be cut by a slitting operation from a circular ring having the same section as that shown in this view of the detent plungers.
  • detent plungers may be economically manufactured from one turned or ground ring.
  • Their upper and lower faces are parallel, except where towards the inner and outer edges of the upper annular face chamfers are formed at a suitable angle to permit radial sliding of the plungers when an axial force is applied to them, either by upper piston 73 or lower piston 55.
  • the angle which these chamfers, when viewed in section, form to the remaining flat face should preferably be as small as is consistent with reliable operation, in order that when they are restraining either of the piston elements from movement under the influence of hydraulic or other forces, 6 the radial load developed shall be the minimum in the interests of low stress in the retaining-ring 76, and a low rate of wear in the case where the plungers are bearing on the outer diameter of upper piston 73, as described below.
  • the retaining ring 76 is urged in a downward direction by helical spring 78, which fits in a recess 78a between the outer cylindrical portion 72b of plug 72, which carries the threads and plain fitting diameters and the inner cylindrical surface 77.
  • the bore of plug 72 is formed with grooves containing oil seals 79 and combined dust seal and scraper ring 80.
  • the upper part of piston rod 73 has a shoulder 81, to which is fitted spherical bearing seat 82.
  • a self-lubricating part-spherical bush 83 rests, and this may be located in a hole in a suitable pressing or lug attached to the axle casing 39, as 84, for example.
  • the pressing may be formed with a male spherical bulge, against which spherical seat 82 may work direct, or with anti-friction material interposed.
  • seating 82 may be made of cast iron or similar material having good anti-friction properties.
  • a rubber or similar pliable bush 85 is fitted above the pressing 84 and secured by a nut 86 and locknut 87. These nuts are screwed on to the threaded extremity of piston rod 73, and this thread may conveniently be of the pipe-thread type, whereto union nut 88 may secure feed-pipe 89.
  • the effect of the spring 48 will be to move the hollow piston 55 up into the cylinder 64 until the enlarged part 68 engages the retaining ring 76 forcing it upwardly against'the action of the spring 78 and the bore of the enlarged part 68 passes over the plug 72 and the. outer ends of the detent plungers 63 until the circumferential groove 61a is opposite them.
  • the cylinder part 64 can then move upwardly over the piston 73 and in so doing forces the detent plungers 63 outwardly out of the groove 91 into the groove 61a whereafter the parts reach the fully contracted position as shown in FIGURE 4.
  • the cylinders 64 and 55 therefore move together downwardly while the detent plungers 63 6 are pressed against the surface of piston rod 73 due to the inward force exerted on them by the angled upper face 62 of the recess 61a in the lower piston 55 bearing against the chamfered face 62a on the plungers 63.
  • the plungers 63 come opposite the groove 91 in upperv piston 73, the said inward force on these plungers will cause their inner portions to occupy the groove 91, thus simultaneously locking the upper piston 73 to plug 72 of cylinder 64 and freeing the lower piston 55 which can then move relative to cylinder 64.
  • This change point is arranged to occur when the roller 52 is approaching but just clear of the ground under those conditions of loading and other variables which bring it nearest to the ground. Hydraulic pressure is now able to force lower piston 55 outwards and downwards, so that it brings roller 52 into contact with the road. In its movement away from the upper end of the cylinder 64 it is followed by retaining ring 76 urged by spring 78. The retaining ring '76 moves downward across the outer surfaces of the interlock plungers 63 until arrested by the shoulder or step 76d mentioned above.
  • This inside diameter of the upper portion of the lower piston 55 should therefore be slightly larger than the major bore 76b of the retaining ring '76, otherwise a danger of jamming would exist if the bore of lower piston 55 were equal to or slightly smaller than the retaining ring bore, since in order to commence passing over the surface of the detent plungers 63, the lower piston 55 might have to compress the detent plungers 63 towards one another against the outward radial force mentioned above. As any such force which lower piston 55 might have to exert would itself add to the outward radial force mentioned above, a jamming condition might be set up.
  • FIGURE 6 shows an alternative construction in which a fine conical lead 163a, say 10, is applied to the mouth of the retaining ring 163.
  • the minor diameter 16319 at the inner end of the conical lead 163a in retaining ring 163 may either adjoin the shoulder 76d which ultimately limits the movement of retaining ring 163, or it may be separated from it by a short parallel portion slightly smaller in diameter than the bore 164 of lower piston 55.
  • the conical lead 163a is so arranged that it attains a diameter equal tobore 164 at a plane lying near to its inner limit.
  • FIGURE 6 shows the mechanism at the point Where the plunger 63 first makes contact with retaining ring 163, while the position of the plunger 63 is still controlled by the bore 164 of the lower piston 55.
  • shallow slots 191 may be formed on the rear face 202 of the piston 55.
  • two slots about deep might be milled at right angles to each other straight across the face of lower r piston 55 as shown in FIGURE 8. Their depth should be less than the depth of a chamfer 168 at the mouth of the bore 164.
  • the roller 52 With continuing extension of the lower piston 55, the roller 52 will roll along the road until it is pushed into contact with the tire 92, and the assembly is so arranged that it can force its way into the flexible tire to a suihcient extent to create a good friction drive under all conditions.
  • the vehicle may now be driven sideways in either direction by selecting low or reverse gear, and operating the controls in a normal manner. As soon as the parking operation is com pleted and the valve control knob is pushed to the off position all pressure is released in the system, and the combined forces of the distorted tire 92 acting on the roller 52 and the refractive force of spring 48, push the roller 52 to the left, as shown in FIGURE 3, that is to say towards the centre of the vehicle.
  • FIGURE 5 shows four interlock plungers 63 as they would be manufactured from a single circular piece of material. The portions cut away by the slitting operation are shown in chain-line.
  • FIGURE 9 shows a further alternative, wherein the sliding plungers 121 are cylindrical in form, with conical ends.
  • This figure shows a view similar to FIGURE 3A.
  • the upper piston 73 is shown in full, but plug 72, retain ing ring 76 and the associated cylinder and piston are shown in half section.
  • the construction is generally similar to that of FIGURES 3 and 4, except that the holes in plug 72, into which fit interlock plungers 120, are circular.
  • Each cylindrical plunger 120 has conical extremities 121 and 122 which engage angular faces 123 and 124 on the upper piston 73 and lower piston 55 respectively.
  • interlock plunger 120 which engages the retaining ring 76, may be formed very slightly convex, so that it presents a suitable surface to slide against the bore of retaining ring 76. In this construction the locking action takes effect through a line contact only between the various conical surfaces of the pistons and interlock plungers so it will be desirable to harden all these surfaces.
  • FIGURES 10 and 11 show a further alternative form of detent mechanism, wherein rocking arms 96 perform the same function as sliding plungers 63 in the previous examples.
  • FIGURE 10 shows a ram assembly of this type in the fully retracted position
  • FIGURE 11 shows an enlarged view of the detent assembly at the moment when the upper piston rod 97, having been fully extended and being now locked by the front lobe 98 of rocking arm 95, and lower piston 99 has been released by the outer locking surface a of rocking arm 96.
  • the lower piston 99 has commenced its extension, followed by retaining ring 101, which has now reached the locking shoulder 100, urged by spring 102.
  • a single sliding plunger or rocking arm 96 type of detent may be used or a plurality thereof.
  • FIGURE 12 shows a further alternative arrangement in which a number of metal balls 204 are used instead of either sliding plungers 12'! or rocking arms 96.
  • the inner face of the upper part of lower piston 103 is formed with a part-spherical groove 20412 which can be engaged by the balls 204 when the piston 97 is in its retracted position.
  • the groove 91 in the piston 97 is shaped to partially accommodate the balls when the piston 97 is fully extended.
  • This arrangement operates in a similar manner to the arrangement shown in FIGURE 9, and is shown at the stage where the balls have been released by full retraction of the lower piston 103 and retaining ring 104.
  • Another arm 1154b of the throttle stop piece 154 lies adjacent to a slot 210 in the support for rod 157, and in this slot a pin 159 lies,
  • pin 159 will be moved to the right to a point opposite lever arm 154b; the eitect of these movements is that, in the first place, the throttle will be slightly opened to a fast tick-over speed suitable for normal sideways parking movements, and at the same time the pin 159 will prevent further excessive opening of the throttle by blocking the path of lever arm 15412 should the accelerator be depressed.
  • a hydraulic ram comprising in combination a plurality of nested parts of different cross dimensions arranged to telescope within each other in fluid tight manner, means including a control valve for supplying fluid under pressure to the interior of the ram, mechanical locking means releasably locking together said parts other than the said part of smallest cross dimension whereby when fluid under pressure is supplied to the interior of the ram relative movement takes place at first only between said smallest part and a locked part, mechanical means conditioned by said relative movement and adapted to release said locking means at the end of the relative movement, said nested parts being three relatively movable ram parts of different diameter, the smallest diameter ram part having an external recess at the end which projects into the largest diameter ram part and the intermediate diam-- eter ram part having an internal recess at the end thereof which projects into the other end of the largest diameter ram part and in which a hollow boss encircles the smallest diameter ram part within said largest diameter ram part to one end of which ram part it is fixed, said hollow boss having
  • said at least one detent comprises a plunger slidably mounted in a guideway in the hollow boss, said guideway extending transversely of the axis of said hollow boss, the inner and outer ends of said plungers having chamfered portions which are engageable respectively with cham- .fered sides of said recesses in said smallest diameter and intermediate diameter ram parts, so that axial movement of these parts, when the plunger is in one of said recesses, forces the plunger out of that recess into the other of said recesses when said recesses are in alignment.
  • each said plunger is circular in cross section and the ends of each said plunger are tapered to provide said chamfering.
  • each said plunger is circular in cross section.
  • a hydraulic ram as claimed in claim 10 said bore of said retaining ring being slightly tapered so that the largest diameter is at that end which is engaged by an end of said intermediate diameter part of the ram.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Road Paving Machines (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Vehicle Body Suspensions (AREA)
US157428A 1960-12-07 1961-12-06 Hydraulic rams Expired - Lifetime US3186308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB42051/60A GB1003691A (en) 1960-12-07 1960-12-07 Improvements in or relating to hydraulic rams

Publications (1)

Publication Number Publication Date
US3186308A true US3186308A (en) 1965-06-01

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US157428A Expired - Lifetime US3186308A (en) 1960-12-07 1961-12-06 Hydraulic rams
US157430A Expired - Lifetime US3202231A (en) 1960-12-07 1961-12-06 Parking apparatus for motor vehicles
US157429A Expired - Lifetime US3185237A (en) 1960-12-07 1961-12-06 Hydraulic rams

Family Applications After (2)

Application Number Title Priority Date Filing Date
US157430A Expired - Lifetime US3202231A (en) 1960-12-07 1961-12-06 Parking apparatus for motor vehicles
US157429A Expired - Lifetime US3185237A (en) 1960-12-07 1961-12-06 Hydraulic rams

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US (3) US3186308A (fr)
BE (1) BE611240A (fr)
CH (1) CH414985A (fr)
DE (2) DE1292524B (fr)
GB (1) GB1003691A (fr)

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US3420148A (en) * 1965-03-12 1969-01-07 Richard E Doerfer Holding device
US4211149A (en) * 1977-10-13 1980-07-08 Pneumo Corporation Split lock ring for locking actuator and method for manufacturing the same
US4369854A (en) * 1975-10-02 1983-01-25 Butterworth Archibald J Parking devices for vehicles
US4392556A (en) * 1978-08-25 1983-07-12 Arkwin Industries, Inc. Actuator locking device
US6234062B1 (en) * 1998-03-05 2001-05-22 Mbm Technology Limited Telescopic piston
US10865738B2 (en) * 2019-02-27 2020-12-15 Woodward, Inc. Traveling finger lock for an actuator
US11441514B2 (en) 2018-10-02 2022-09-13 Woodward, Inc. Tertiary lock
US11788490B1 (en) 2022-12-05 2023-10-17 Woodward, Inc. Traveling finger lock for an actuator

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US3298664A (en) * 1964-08-27 1967-01-17 Duff Norton Co Shielded jack
GB1123721A (en) * 1964-08-27 1968-08-14 Sidler Ltd Improvements relating to parking apparatus for motor road vehicles
US3589461A (en) * 1967-09-15 1971-06-29 Sidler Ltd Parking devices for motor road vehicles
FR2479357A1 (fr) * 1980-04-01 1981-10-02 Baker Cac Dispositif de commande actionne par fluide
FR2637025B1 (fr) * 1988-09-28 1990-12-28 Toutenkamion Procede pour retracter un verin, et verin correspondant
USD329626S (en) 1990-07-16 1992-09-22 The Goodyear Tire & Rubber Company Pneumatic tire tread and buttress
US5884720A (en) * 1996-02-26 1999-03-23 Jacob Ackerman Parking device for vehicles
GB2317596B (en) * 1996-09-26 2001-01-31 Bradley Doublelock Ltd Retractable arrangement
CN106828439B (zh) * 2017-02-17 2019-06-25 济南匠夫万自动化科技有限公司 一种备用驱动系统及车辆
CN110203852B (zh) * 2019-05-24 2021-02-19 广西正茂路桥建设有限公司 一种道路施工大直径水泥管段搬运装置
CN112092930B (zh) * 2020-09-07 2021-11-23 湖南福格森装备科技有限公司 一种履带运输机的辅助行驶装置
CN112850552B (zh) * 2020-12-31 2023-09-19 杭州海康机器人股份有限公司 一种搬运装置及货物搬运方法
CN112960584A (zh) * 2021-02-02 2021-06-15 长江三峡通航管理局 一种自驱动螺旋升降装置及升船机安全机构拆装方法
CN113292004B (zh) * 2021-06-30 2022-07-05 常熟通润汽车零部件股份有限公司 一种易加工且自适应的千斤顶

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US1842776A (en) * 1930-03-15 1932-01-26 Sikorsky Aviat Corp Fluid strut
DE585388C (de) * 1932-01-22 1933-10-06 Versuchsanstalt Fuer Luftfahrt Flugzeugstrebe mit verstellbarer Laenge
US2690712A (en) * 1951-02-19 1954-10-05 Stratton Equipment Company Automatic throttle control
GB852124A (en) * 1958-03-24 1960-10-26 Archibald James Butterworth Improvements in or relating to control devices for hydraulically actuated jacking orparking mechanisms

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US2375750A (en) * 1942-01-19 1945-05-15 John Eley Jr Hydraulic brake system for motor vehicles
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US3420148A (en) * 1965-03-12 1969-01-07 Richard E Doerfer Holding device
US4369854A (en) * 1975-10-02 1983-01-25 Butterworth Archibald J Parking devices for vehicles
US4211149A (en) * 1977-10-13 1980-07-08 Pneumo Corporation Split lock ring for locking actuator and method for manufacturing the same
US4392556A (en) * 1978-08-25 1983-07-12 Arkwin Industries, Inc. Actuator locking device
US6234062B1 (en) * 1998-03-05 2001-05-22 Mbm Technology Limited Telescopic piston
US11441514B2 (en) 2018-10-02 2022-09-13 Woodward, Inc. Tertiary lock
US11939934B2 (en) 2018-10-02 2024-03-26 Woodward, Inc. Tertiary lock
US10865738B2 (en) * 2019-02-27 2020-12-15 Woodward, Inc. Traveling finger lock for an actuator
US11788490B1 (en) 2022-12-05 2023-10-17 Woodward, Inc. Traveling finger lock for an actuator

Also Published As

Publication number Publication date
US3202231A (en) 1965-08-24
DE1296013B (de) 1969-05-22
GB1003691A (en) 1965-09-08
BE611240A (fr) 1962-03-30
CH414985A (fr) 1966-06-15
DE1292524B (de) 1969-04-10
US3185237A (en) 1965-05-25

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