US3766803A - Valve operator with explosive cartridge - Google Patents

Valve operator with explosive cartridge Download PDF

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Publication number
US3766803A
US3766803A US00246990A US24699072A US3766803A US 3766803 A US3766803 A US 3766803A US 00246990 A US00246990 A US 00246990A US 24699072 A US24699072 A US 24699072A US 3766803 A US3766803 A US 3766803A
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US
United States
Prior art keywords
twist
actuator
explosive
tube
valve
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.)
Expired - Lifetime
Application number
US00246990A
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English (en)
Inventor
R Ball
W Denkowski
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.)
Philadelphia Gear Corp
Limitorque LLC
Original Assignee
Philadelphia Gear Corp
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 Philadelphia Gear Corp filed Critical Philadelphia Gear Corp
Priority to US00246990A priority Critical patent/US3766803A/en
Priority to CA157,021A priority patent/CA973055A/en
Priority to GB5960072A priority patent/GB1363790A/en
Priority to JP48043248A priority patent/JPS5246602B2/ja
Priority to DE19732320534 priority patent/DE2320534B2/de
Priority to DE19737315399U priority patent/DE7315399U/de
Application granted granted Critical
Publication of US3766803A publication Critical patent/US3766803A/en
Assigned to LIMITORQUE CORPORATION, THE reassignment LIMITORQUE CORPORATION, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PHILADELPHIA GEAR CORPORATION, A PA. CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
    • F16K13/04—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member
    • F16K13/06—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member constructed to be ruptured by an explosion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1632—Destructible element
    • Y10T137/1647—Explosive actuation

Definitions

  • ABSTRACT A valve operator incorporates an explosivev actuator M which includes an elongated twisted steel tube, for
  • the twisted-tube actuator is a series component of the normal gear drive.
  • the actuator is coupled or decou pled by a clutch mechanism.
  • Pipe-line valves are sometimes located in locations which are not served by power distribution lines. Or, there may be a power failure in the power distribution line. In either case, a service man may need a considerable amount of time to reach the valve, and, having reached the valve, it may take the service man a further considerable amount of time to close the valve manually. Yet emergency situations may develop which may make it necessary to close (or open) the valve quickly.
  • An object of the present invention is to provide a valve operator device adapted, in an emergency situation, to put a valve very quickly in a desired condition, which may be either the closed or open position.
  • a further object is to provide a valve operator having the capabilities just mentioned which may be triggered from a remote location without use of power distribution lines.
  • a valve operator which incorporates an explosive cartridge twisttube actuator.
  • One end of the twist-tube actuator is fixed against rotational movement.
  • the other end is free to rotate through an angle within a range such, for example, as 60 to 120.
  • the cartridge is exploded (it may be triggered either manually, or by radio from a remote control station, or otherwise), the hot gases generated by the explosion cause the twist tube to untwist and the free end of the actuator rotates.
  • the free end of the actuator is connected to the valve stem, and, accordingly, rotational movement of the free end is effective to quickly close (or open) the valve.
  • twist-tube actuator is a component part of the manual, or other normal, drive system for opening and closing the valve.
  • the twist-tube actuator is driven rotationally in both directions, without untwisting, by the normal drive whenever the valve is opened or closed by the normal gear drive.
  • the twist-tube actuator is not normally in the drive system. It is coupled to the normal drive system through a novel clutch device.
  • the clutch is effective to couple the free end of the twisttube actuator to the valve stem, to drive the valve stem rotationally through the necessary angle to put the valve in the desired position.
  • FIG. 1 is an elevational view, partly in section, illustrating one form of twist-tube actuator, according to the present invention, in which the explosive-cartridge twist-tube actuator is a component part of the normal invention, in which the twist-tube actuator is coupled to the normal drive system through a novel form of clutch.
  • FIG. 5 is a view, in section, looking down along the line 5-5 of FIG. 4 and showing the worm-drive clutch parts in the positions occupied when the valve is in closed position.
  • FIG. 6 is a view, in section, looking down along the line 6-6 of FIG. 4 and showing clutch parts in the positions occupied when the twist-tube actuator is unfired and the valve is in closed position.
  • FIG. 7 is a view, in section, looking along the same line as in FIG. 6 and showing the clutch parts in the positions occupied when the actuator is unfired and the valve is in open position.
  • FIG. 8 is a view, in section, looking along the same line as in FIG. 6 showing the clutch parts in the positions occupied after the cartridge has been fired and the valve closed by the twist-tube actuator.
  • FIG. 9 is an exploded perspective view of the component parts of the clutch mechanism which couples the twist-tube actuator to the valve stem.
  • Worm gear 11 is keyed, as by a key 14, to a drive sleeve 12, and the upper end portion of drive sleeve 12 is keyed or splined, as by splines 19, to the lower end portion of a rotatable torque tube 13.
  • the upper end of torque tube 13 is screwed, or bolted, or otherwise secured, to a top plate 18 which is screwed or bolted to the upper end 21 of twist tube actuator 20.
  • the twist-tube actuator 20 includes a helically twisted hollow steel tube 22 which extends from the upper end 21 to a lower base 24.
  • Base 24 is secured as by screws 27 (FIG. 1) to the lower end of the helically twisted tube 22.
  • Base 24 is free to move rotationally relative to torque tube 13 of the valve operator.
  • Base 24 is provided with depending lugs 25, four such lugs being shown.
  • Lugs 25 are received within slots or recesses 26 in the upper end surface of a rotatable sleeve 30.
  • Sleeve 30 is splined or keyed, as by key 32, to the valve stem 35.
  • Valve stem 35 is provided at its lower end with a valve closure element, not shown.
  • the valve closure element may be a butterfly, or plug, or other type such that rotation of the closure element through moves the closure element from fully open to fully closed posi-- explosive charge of known type adapted to be fired.
  • valve stem 35 In normal operation, the valve stem 35 is moved through the required 90 to open and close the valve closure element by rotating the worm shaft 17, as by a handwheel or otherwise.
  • Worm 10 drives worm gear 11 which is keyed to and drive drive sleeve 12.
  • Sleeve 12 is splined to torquetube l3, and thus torque tube 13 and its plate 18 are driven rotationally.
  • the upper end 21 of twist tube actuator 20 is secured to plate 18 and, accordingly, when torque tube 13 and plate 18 are driven rotationally, the upper end 21 of the helicallytwisted hollow tube 22 is driven rotationally.
  • the twisted tube 22 is made of metal, preferably steel, and is designed to have sufficient strength to retain its twisted form when the upper end 21 is rotated.
  • the lower base 24 of the twist tube structure is rotated in like manner when the upper end 21 is rotated.
  • the lugs 25 in the slots 26 of sleeve 30 cause sleeve 30 to be also driven rotationally. This rotates valve stem 35 and moves the valve closure element.
  • the device operates in both directions, to either close or to open the valve, or for that matter, to put the closure element in any position intermediate fully closed and fully open.
  • the emergency position may be either the fully closed or the fully open position. However, to simplify the description, it may be assumed, during the remainder of this specification, that the emergency position is the fully closed position.
  • the explosive charge of the twist-tube actuator 20, in the upper end 21, is triggered, as by radio signal from a remote control station, or manually by an attendant on the scene.
  • the hot gases generated by the explosion surge through the helically twisted hollow steel tube 22 and cause it to untwist or straighten.
  • the upper ends of the helical tube 22 is fixed to the upper end 21 of the actuator 20, and end 21 is bolted or otherwise secured to plate 18 or torque tube 13.
  • the lower end of torque tube 13 is now held against rotation by reason of its being keyed or splined to the now motionless drive sleeve 12 which is keyed to worm gear 11 which is locked against rotation by worm which is now motionless.
  • the upper end 21 of the actuator 20 is held against rotation.
  • the lower base 24 of the actuator 20 is driven rotationally in a direction to move the stem 35 rotationally in a direction to move the closure element to the desired closed position.
  • twist-tube actuator 20 may be designed to effect rotation of its free end 24 through a wide range of rotational movements, in the design of the embodiment of FIGS. 1-3, now being described, it is only necessary that twist device 20 be designed to effect a rotation of 90 of its free end 24 in response to explosion of the charge in its cartridge.
  • the twisted tube 22, upon firing, untwists in one direction only, and that the free end 24 is driven in but one direction.
  • the direction of the helical twist of the tube must be selected to drive the valve stem 35 in the direction desired to move the valve closure element to the desired position, which, in most cases at least, will be the fully closed position.
  • valve closure element will be neither fully opened nor fully closed, but in an intermediate position which requires less than 90 of rotation to put the valve closure element in fully closed, or fully opened, position.
  • twist-tube actuator 20 when filed, attempts to, but cannot, move its free end 24, sleeve 30, and valve stem 35, through a full 90 does no harm to the valve closure element or to the valve operator.
  • the twisted tube 22 of the actuator merely becomes distorted as a result of the inability of the base 24 to move through a full 90.
  • the twist-tube actuator 20 in its unexploded twisted form, is a component part of the normal drive system. That is to say, the twist-tube device 20 moves rotationally in its twisted form without untwisting, during normal opening and closing of the valve by worm shaft 17 and worm gear 11.
  • FIGS. 4-8 there is illustrated a modification in which the twisted-tube actuator 20 is not a part of the normal drive system, but is decoupled therefrom through a clutch arrangement. It is not until the explosive charge of actuator 20 is fired that the twisted-tube actuator 20 becomes coupled, through the clutch, to the valve stem.
  • valve operator shown in these figures is similar in a number of respects to that shown in FIGS. 1-3, and corresponding parts are identified by the same reference numerals.
  • the difference between the valve operator of FIGS. I3 and the valve operator of FIGS. 4-9 resides in the fact that in the operator of FIGS. 4-9 the twist-tube actuator 20 is normally decoupled from the worm gear drive system by a clutch mechanism.
  • the drive worm gear 11 is keyed or splined by key or spline 14 to a drive sleeve 52 having a smaller-diameter lower portion and a largerdiameter upper end portion 54 which functions as a clutch drive ring.
  • a clutch driven sleeve 60 fitted within clutch driven ring 54 is a clutch driven sleeve 60.
  • the clutch driven sleeve has a smaller-diameter lower portion 61 which fits within the smaller-diameter portion of drive sleeve 52, and has a larger-diameter upper portion 62 which fits within and is supported by the clutch drive ring portion 54 of drive sleeve 52.
  • the portion 62 of clutch driven 60 is provided with a through slot 63 having therein a pair of detent rollers 64 and 65.
  • the height of slot 63 is greater than the height of the rollers.
  • the sum of the diameters of rollers 64 and 65 is greater than the thickness of the wall of portion 62, and hence greater than the length of slot 63. Accordingly, a portion of one of the rollers projects beyond one or the other of the ends of slot 63.
  • a recess 55 is provided in the inner wall of clutch drive ring 54 for receiving the projecting portion of roller 64.
  • a cartridge lug ring 40 having projecting upwardly therefrom a lug 41.
  • Lug 41 is semiannular in length, occupying about one-half of the upper surfaces of lug ring 40.
  • Projecting downwardly from the under surface oflug ring 40 is a lug 42 which fits within the upper portion of slot 63, above the rollers 64, 65.
  • the upper end 21 of the twist-tube actuator 20 is similar to that of the upper end 21 of twist-tube actuator 20 of FIGS. l-3.
  • the upper end 21 is screwed to end plate 18 which is screwed or bolted to the upper end of a torque tube 28 which extends upwardly from and is fixed, as by welding, to the frame or housing 39 of the valve operator.
  • the embodiment of FIGS. 4-9 is different from that of FIGS. 11-3.
  • the torque tube 13 is rotatable.
  • the torque tube 28 is fixed to the frame and is not rotatable.
  • the lower end 24 of the twist-tube actuator has bolted thereto a cap 45 which is coupled, as by key or spline 46, to a cartridge drive lug member 50.
  • Member 50 as best seen in FIG. 9, has a largerdiameter upper portion 55, a reduced-diameter intermediate portion 56 and a still smaller-diameter lower portion 57.
  • Projecting downwardly from the annular undersurface of upper portion 55 is a lug 58, a face of which is adapted to abut against a face of upstanding lug 41 of lug ring 40.
  • the outer surface of the intermediate portion 56 is provided with a recess 59 for receiving a portion of roller 65, as will be described.
  • the smaller-diameter lower portion 57 is received within the bore of drive sleeve 61.
  • worm gear 11 through key or splines 14, drives drive sleeve 52 the upper enlarged-diameter end of which forms the clutch drive ring 54. If the valve is in the closed position, the slot 63 is in the position illustrated in FIGS. 5 and 6. If the valve is in the open position, the slot 63 is in the position shown in FIG. 7. In either case, with the charge of cartridge device 20 unexploded, the
  • Clutch drive sleeve 60 and valve stem 35 are driven 90 in one direction to close the valve, and 90 in the opposite direction to open the valve.
  • FIGS. 4, 5 and 6 illustrate the position of the component parts when the valve is in closed position and the cartridge is unfired.
  • F I68. 7 and 9 illustrate the positions of the parts when the valve is in open position and the cartridge is unfired.
  • FIG. 8 illustrates the position of parts after firing.
  • FIG. 7 illustrates the angular position of lug 58 relative to that of the semi-annular lug 41 of lug ring 40 when the valve is fully open. This condition is also illustrated in FIG. 9. It will be understood that the angular position of clutch drive sleeve 60 which, in response to worm drive, is in turn controlled by the clutch drive ring 54.
  • cap 45 and cartridge drive lug member 50 are driven rotationally, clockwise as viewed in FIGS. 7 and 9, and depending lug 58 moves toward the upstanding lug 41 of lug ring 40.
  • the face 158 of lug 58 meets face 141 of lug 41 and as lug 58 continues its clockwise movement, lug 41 is driven rotationally, clockwise as viewed in FIGS. 7, 8 and 9.
  • This clockwise rotation of lug 41 and lug ring 40 drives clutch driven sleeve 60 clockwise, due to the fact that dependent lug 42 of ring 40 projects into the upper part of slot 63.
  • a stop element may be provided to stop rotation of the valve stem 35 after it has been driven to the fully closed position.
  • a site window 67 is illustrated at the right hand side of the structure. Suitable markings such as OPEN and CLOSED, and also suitable intermediate markings therebetween may be placed on an arcuate indicated scale 69 mounted on the lug ring 40 and mo vable therewith so that information as to the position of the valve is visible through the window.
  • a valve operator comprising: a. a housing; b. a valve stem; c. gear drive means; (1. an explosive twist-tube actuator;
  • a valve operator according to claim 1 characterized in that said means coupling said gear drive means to said valve stem includes said explosive twist-tube actuator in unfired twisted condition.
  • a worm gear coupled to and driven by said worm
  • a valve operator according to claim 1 characterized in that:
  • said means coupling said gear driven means to said valve stem is exclusive of said explosive twist-tube actuator
  • twist-tube actuator is fixed to said housing, the other end being free to rotate.
  • a valve operator characterized in that clutch means are provided for decoupling said explosive twist-tube actuator from said valve stem when in unfired condition, and for coupling said free end of said twist-tube actuator to said valve stem and simultaneously uncoupling said gear drive means in response to the firing of said explosive twist-tube actuator.
  • a valve operator according to claim 6 further characterized in that:
  • said clutch means is effective to maintain said free end of said twist-tube actuator decoupled from said valve stem when said explosive twist-tube actuator is in unfired condition;
  • said clutch means is effective to couple said free end of said twist-tube actuator to said valve stem in response to firing of said explosive twist-tube actuator;
  • said clutch means is effective upon firing of said twist-tube actuator to uncouple said worm-gear drive sleeve.
  • a valve operator according to claim 7 characterized in that:
  • said clutch means includes means for coupling said worm-gear drive sleeve to said second drive sleeve when said twist-tube actuator is in unfired condition;
  • said clutch means in response to firing of said twist-tube actuator, is effective to uncouple said second drive sleeve from said worm-gear drive sleeve and to couple said twist-tube actuator to said second drive sleeve.
  • a valve operator characterized in that said clutch means includes detent rollers which in one position couple said worm-gear drive sleeve to said second drive sleeve and in another position couple said explosive twist-tube actuator to said second drive sleeve.
  • a rotary drive having a housing, a load shaft and gear drive means for normally driving said load shaft, the improvement which includes the incorporation of an auxiliary drive for effecting rapid rotation of the load shaft through a limited angular movement to a desired emergency position, said auxiliary drive means comprising:
  • an explosive actuator comprising an elongated twisted tube connected to a base at each end, said twisted tube being adapted to untwist and to move one of said bases rotationally in response to firing of said explosive;
  • said means connecting said one base of said explosive actuator to said load shaft includes:
  • said gear drive means is normally coupled to said load shaft through said clutch mechanism
  • said clutch mechanism includes:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Gear Transmission (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
US00246990A 1972-04-24 1972-04-24 Valve operator with explosive cartridge Expired - Lifetime US3766803A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00246990A US3766803A (en) 1972-04-24 1972-04-24 Valve operator with explosive cartridge
CA157,021A CA973055A (en) 1972-04-24 1972-11-20 Valve operator with explosive cartridge
GB5960072A GB1363790A (en) 1972-04-24 1972-12-27 Rotary drive operating mechanism with an explosive cartridge
JP48043248A JPS5246602B2 (de) 1972-04-24 1973-04-18
DE19732320534 DE2320534B2 (de) 1972-04-24 1973-04-21 Ventilbetaetigungseinrichtung
DE19737315399U DE7315399U (de) 1972-04-24 1973-04-21 Ventilbetaetiger mit explosivkoerper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00246990A US3766803A (en) 1972-04-24 1972-04-24 Valve operator with explosive cartridge

Publications (1)

Publication Number Publication Date
US3766803A true US3766803A (en) 1973-10-23

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ID=22933061

Family Applications (1)

Application Number Title Priority Date Filing Date
US00246990A Expired - Lifetime US3766803A (en) 1972-04-24 1972-04-24 Valve operator with explosive cartridge

Country Status (5)

Country Link
US (1) US3766803A (de)
JP (1) JPS5246602B2 (de)
CA (1) CA973055A (de)
DE (2) DE7315399U (de)
GB (1) GB1363790A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203171A (en) * 1991-09-30 1993-04-20 Design & Manufacturing Corporation Rotary electrothermal actuator
US5263324A (en) * 1991-09-30 1993-11-23 Design & Manufacturing Company Rotary electrothermal actuator
US5842657A (en) * 1997-08-15 1998-12-01 Trw Inc. Seat belt webbing pretensioner
US20120175543A1 (en) * 2011-01-10 2012-07-12 Hamilton Sundstrand Corporation Valve release mechanism
US20130214183A1 (en) * 2010-10-29 2013-08-22 Curtis Len Wilie Collapsible casing device for use in controlling flow
CN106151534A (zh) * 2016-07-30 2016-11-23 广汉华油钻采设备制造有限公司 动力节流装置
CN108952624A (zh) * 2017-05-19 2018-12-07 中国石油化工股份有限公司 一种无限级全通径压裂滑套

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704947A (en) * 1953-04-30 1955-03-29 Morgan Smith S Co Manual and automatic valve actuator with declutching unit
US2885906A (en) * 1956-08-02 1959-05-12 Cupedo Douwe Janse Stop valve comprising a screw spindle
US2980085A (en) * 1960-04-01 1961-04-18 John A Schneider Rotary thruster
US3022793A (en) * 1958-10-31 1962-02-27 Universal Match Corp Explosively actuated valves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704947A (en) * 1953-04-30 1955-03-29 Morgan Smith S Co Manual and automatic valve actuator with declutching unit
US2885906A (en) * 1956-08-02 1959-05-12 Cupedo Douwe Janse Stop valve comprising a screw spindle
US3022793A (en) * 1958-10-31 1962-02-27 Universal Match Corp Explosively actuated valves
US2980085A (en) * 1960-04-01 1961-04-18 John A Schneider Rotary thruster

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203171A (en) * 1991-09-30 1993-04-20 Design & Manufacturing Corporation Rotary electrothermal actuator
US5263324A (en) * 1991-09-30 1993-11-23 Design & Manufacturing Company Rotary electrothermal actuator
US5842657A (en) * 1997-08-15 1998-12-01 Trw Inc. Seat belt webbing pretensioner
US20130214183A1 (en) * 2010-10-29 2013-08-22 Curtis Len Wilie Collapsible casing device for use in controlling flow
US9255459B2 (en) * 2010-10-29 2016-02-09 Shell Oil Company Collapsible casing device for use in controlling flow
US20120175543A1 (en) * 2011-01-10 2012-07-12 Hamilton Sundstrand Corporation Valve release mechanism
US8622070B2 (en) * 2011-01-10 2014-01-07 Kidde Technologies, Inc. Valve release mechanism
CN106151534A (zh) * 2016-07-30 2016-11-23 广汉华油钻采设备制造有限公司 动力节流装置
CN108952624A (zh) * 2017-05-19 2018-12-07 中国石油化工股份有限公司 一种无限级全通径压裂滑套
CN108952624B (zh) * 2017-05-19 2021-06-25 中国石油化工股份有限公司 一种无限级全通径压裂滑套

Also Published As

Publication number Publication date
DE2320534A1 (de) 1973-11-15
DE2320534C3 (de) 1978-07-06
CA973055A (en) 1975-08-19
GB1363790A (en) 1974-08-14
DE7315399U (de) 1973-08-30
JPS5246602B2 (de) 1977-11-26
JPS4921713A (de) 1974-02-26
DE2320534B2 (de) 1977-11-24

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LIMITORQUE CORPORATION, THE, LYNCHBURG, VIRGINIA,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PHILADELPHIA GEAR CORPORATION, A PA. CORP.;REEL/FRAME:004850/0845

Effective date: 19880331

Owner name: LIMITORQUE CORPORATION, THE, VIRGINIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PHILADELPHIA GEAR CORPORATION, A PA. CORP.;REEL/FRAME:004850/0845

Effective date: 19880331