US3661053A - Reversing switch actuator for fluid motor - Google Patents

Reversing switch actuator for fluid motor Download PDF

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Publication number
US3661053A
US3661053A US95311A US3661053DA US3661053A US 3661053 A US3661053 A US 3661053A US 95311 A US95311 A US 95311A US 3661053D A US3661053D A US 3661053DA US 3661053 A US3661053 A US 3661053A
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US
United States
Prior art keywords
ball
switch
rod
radially
cylinder head
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
US95311A
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English (en)
Inventor
Beldon L Rich
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.)
Parker Hannifin Corp
Original Assignee
Parker Hannifin 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 Parker Hannifin Corp filed Critical Parker Hannifin Corp
Application granted granted Critical
Publication of US3661053A publication Critical patent/US3661053A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/08—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by electric or magnetic means
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means

Definitions

  • ABSTRACT A fluid motor having piston actuated switches on the cylinder heads thereof which control operation of a solenoid reversing valve to achieve automatic reciprocation of the piston.
  • Each switch actuator comprises a radially positioned assembly which includes a relatively large diameter ball which is engaged by the piston as it approaches the end of its stroke, a large diameter spring follower which is spring biased against the ball, and a small diameter actuator rod which has sliding sealed engagement with a switch retainer in the cylinder head, the radially inner end portion of the rod being engaged with the spring follower and the radially outer end portion of the rod being engageable with the switch plunger to close the switch contacts to reverse the piston when theball, follower, and rod have been moved radially outwardly by the engagement of the piston with the ball.
  • Another characterizing feature of this invention is that as the ball is engaged by the piston it tends to be moved axially but there is, in addition, a tendency to rotate the ball so as not to impose an axial or side load on the radially movable spring follower and switch actuator rod.
  • FIG. 1 a schematic piping and wiring diagram of the left the right-hand switch 5 will be opened but the reversing valve 4 will remain in the actuated position and as the piston 8 approaches the end of its left-hand stroke, the left-hand switch 5 will be closed to energize the left-hand solenoid 9 so as to shift the valve 4 to the position shown in FIG. 1 thereby to conduct fluid under pressure again into the rod end 6 with the displaced fluid being conducted to the reservoir 2 via valve 4. 7
  • both switches 5 and actuating mechanisms therefor are of substantially identical construction, except for the diameters of the cam rod 11 and cam sleeve 12 on opposite sides of the piston 8, only one of the switches 5 and switch actuating mechanisms have been illustrated in FIGS. 2 and 3.
  • the cylinder head 7 is provided with'an axial bore 14 into which the piston cam rod 11 loosely extends as e the piston 8 moves to the right.
  • the cylinder head 7 also has a a fluid motor control system for effecting automatic reversal.
  • the reference numeral 2 denotes a fluid reservoir from which the pump 3 draws fluid for supplying fluid under pressure into either the rod end or the head end of the motor 1 via a solenoid operated reversing 'valve 4.
  • Switches 5;5 are mounted on the respective cylinder heads 6 and 7 and are adapted to be closed by the movement of the piston 8 toward the respective heads 6 and 7 to energize the respective solenoids 9 and 10 for effecting operation of the reversing valve 4 so as to cause movement of the piston 8 in the opposite direction.
  • the reversing valve 4 when the piston 8 is moving to the right, the reversing valve 4 is in the position shown whereby fluid under pressure is conducted into the rod end 6 of the cylinder 1 and the fluid displaced from the head end 7 of the cylinder is conducted through the reversing valve. 4 into the reservoir 2.
  • the right-hand switch 5 is closed to energize the right-hand solenoid 10 whereby the valve 4 is shifted so that fluid under pressure is now conducted into the head end 7 of the cylinder while the fluid displaced from the rod end 6 is conducted through the valve 4 to the reservoir 2.
  • a switch retainer 19 Screwed into the radial bore 15 is a switch retainer 19 which is sealed in the bore as by means of the packing ring 20, and which has a threaded upper end extending through an opening in the switch box 21, the latter containing the limit switch 5 having its switch plunger 23 disposed for movement coaxially with the axis of the retainer 19.
  • the switch box 21 is securely mounted on the cylinder head 7 as by means of the lock nut 24 which is threaded onto the upper end portion of the retainer 19.
  • a spring 26 Compressed between the switch retainer 19 and a spring follower 25 which has a plane radially inner face engaged with the radially outermost portion of the ball 18 is a spring 26 which yieldably holds the ball 18 in its seat 17 so that the radially inner portion of the ball 18 is disposed for engagement by the piston cam rod 11.
  • the radial movement of the ball 18 and follower 25 istransmitted to the switch plunger 23 for closing the contacts (not shown) in switch 5 through a small diameter actuating rod 27 which may be press fitted or otherwise secured to the spring follower 25 and which has a close sliding fit in a central bore in the switch retainer 19.
  • the actuator rod 27 is slidably sealed in the bore in retainer 19 as by means of an O-ring 28.
  • the ball seat 17 is as shown provided with a leakage slot 29 so that the ball 18 and follower 25 will be pressure balanced so that only the effective, area of the small actuating rod 27 is acted upon by the high pressure.
  • the upper end of the actuating rod 27 may be provided with a plastic or like switch engaging button 30.
  • Another feature of the present invention is that because the ball 18 has contact with a plane face of the follower 25, the ball guide bore in ring 16 and the actuator rod guide bore in retainer 19 need not be perfectly concentric. In other words, any eccentricity of these guide bores does not cause any binding action which would interfere with movement of the ball 18 or rod 27 in their respective guide bores.
  • said last-named means comprises a solenoid operated valve which, upon actuation of said switch, conducts fluid pressure into said motor to move said component away from such predetermined position.
  • a switch retainer is secured in the radially outer portion of said radial bore to provide means by which said switch is secured to said cylinder head and to provide a guide bore for radial movement of said rod.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
US95311A 1970-12-04 1970-12-04 Reversing switch actuator for fluid motor Expired - Lifetime US3661053A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9531170A 1970-12-04 1970-12-04

Publications (1)

Publication Number Publication Date
US3661053A true US3661053A (en) 1972-05-09

Family

ID=22251319

Family Applications (1)

Application Number Title Priority Date Filing Date
US95311A Expired - Lifetime US3661053A (en) 1970-12-04 1970-12-04 Reversing switch actuator for fluid motor

Country Status (5)

Country Link
US (1) US3661053A (de)
AU (1) AU459065B2 (de)
CA (1) CA935719A (de)
DE (1) DE2159926C2 (de)
GB (1) GB1338282A (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158120A (en) * 1978-02-13 1979-06-12 Pawlowski Eugene J Electric and air signal element
US4295413A (en) * 1976-06-18 1981-10-20 Teijin Seiki Company, Limited Hydraulic actuator
US4365538A (en) * 1979-09-21 1982-12-28 Aisin Seiki Kabushiki Kaisha Vacuum operatable differential servo-motor
US4413549A (en) * 1981-06-18 1983-11-08 Parker-Hannifin Corporation Limit switch actuator for fluid cylinders
US4632018A (en) * 1983-06-02 1986-12-30 Lymburner Robert K Fluid cylinder position sensor mounting apparatus
US4982652A (en) * 1989-05-19 1991-01-08 Blatt John A Fluid operated actuator with recessed position sensor and recessed end cap fastener
US6502880B1 (en) * 2000-03-08 2003-01-07 Btm Corporation Pin part locator
US20040035289A1 (en) * 2000-04-21 2004-02-26 Bruno Colin Device for actuating at least a piston and method for detecting failure in a device
US20120180654A1 (en) * 2009-11-23 2012-07-19 Numatics, Incorporated Piston and Cylinder Assembly with an Indicator Pin Device
KR20150108828A (ko) * 2013-01-22 2015-09-30 가부시키가이샤 코스멕 실린더 장치
JP2015230025A (ja) * 2014-06-04 2015-12-21 パスカルエンジニアリング株式会社 流体圧シリンダ及びクランプ装置
JP2017062022A (ja) * 2015-09-25 2017-03-30 株式会社コスメック シリンダ装置
US10018191B2 (en) 2012-12-28 2018-07-10 Kosmek Ltd. Cylinder apparatus
EP3419037A1 (de) * 2017-06-22 2018-12-26 HYDRAULIQUE PB (Société Anonyme) Detektionsvorrichtung
US10385889B2 (en) * 2015-06-26 2019-08-20 Kosmek Ltd. Cylinder device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628873A (en) * 1947-03-07 1949-09-06 Trico Folberth Ltd Improvements relating to fluid motors
US2691962A (en) * 1950-01-09 1954-10-19 Rockwell Mfg Co Electrical control circuit for hydropneumatic power mechanisms
US2949098A (en) * 1956-03-21 1960-08-16 Flick Reedy Corp Actuator for service in piston and cylinder devices
US3968285A (en) * 1971-03-15 1976-07-06 General Latex And Chemical Corporation One-part foamable latex composition

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960077A (en) * 1959-04-22 1960-11-15 Hydro Line Mfg Co Fluid pressure actuating mechanism
US3530896A (en) * 1968-04-25 1970-09-29 Whiteman Marvin E Hydraulic power actuator and pilot valve unit assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628873A (en) * 1947-03-07 1949-09-06 Trico Folberth Ltd Improvements relating to fluid motors
US2691962A (en) * 1950-01-09 1954-10-19 Rockwell Mfg Co Electrical control circuit for hydropneumatic power mechanisms
US2949098A (en) * 1956-03-21 1960-08-16 Flick Reedy Corp Actuator for service in piston and cylinder devices
US3968285A (en) * 1971-03-15 1976-07-06 General Latex And Chemical Corporation One-part foamable latex composition

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295413A (en) * 1976-06-18 1981-10-20 Teijin Seiki Company, Limited Hydraulic actuator
US4158120A (en) * 1978-02-13 1979-06-12 Pawlowski Eugene J Electric and air signal element
US4365538A (en) * 1979-09-21 1982-12-28 Aisin Seiki Kabushiki Kaisha Vacuum operatable differential servo-motor
US4413549A (en) * 1981-06-18 1983-11-08 Parker-Hannifin Corporation Limit switch actuator for fluid cylinders
US4632018A (en) * 1983-06-02 1986-12-30 Lymburner Robert K Fluid cylinder position sensor mounting apparatus
US4982652A (en) * 1989-05-19 1991-01-08 Blatt John A Fluid operated actuator with recessed position sensor and recessed end cap fastener
US6502880B1 (en) * 2000-03-08 2003-01-07 Btm Corporation Pin part locator
US6854376B2 (en) * 2000-04-21 2005-02-15 Biomerieux S.A. Device for actuating a least piston and method for detecting failure in a device
US20040035289A1 (en) * 2000-04-21 2004-02-26 Bruno Colin Device for actuating at least a piston and method for detecting failure in a device
US20120180654A1 (en) * 2009-11-23 2012-07-19 Numatics, Incorporated Piston and Cylinder Assembly with an Indicator Pin Device
US9091285B2 (en) * 2009-11-23 2015-07-28 Numatics, Incorporated Piston and cylinder assembly with an indicator pin device
US10018191B2 (en) 2012-12-28 2018-07-10 Kosmek Ltd. Cylinder apparatus
KR20150108828A (ko) * 2013-01-22 2015-09-30 가부시키가이샤 코스멕 실린더 장치
US20150345521A1 (en) * 2013-01-22 2015-12-03 Kosmek Ltd. Cylinder apparatus
US9909600B2 (en) * 2013-01-22 2018-03-06 Kosmek Ltd. Cylinder apparatus
JP2015230025A (ja) * 2014-06-04 2015-12-21 パスカルエンジニアリング株式会社 流体圧シリンダ及びクランプ装置
US10385889B2 (en) * 2015-06-26 2019-08-20 Kosmek Ltd. Cylinder device
JP2017062022A (ja) * 2015-09-25 2017-03-30 株式会社コスメック シリンダ装置
EP3419037A1 (de) * 2017-06-22 2018-12-26 HYDRAULIQUE PB (Société Anonyme) Detektionsvorrichtung

Also Published As

Publication number Publication date
AU3578871A (en) 1973-05-24
AU459065B2 (en) 1975-02-26
CA935719A (en) 1973-10-23
DE2159926A1 (de) 1972-06-29
GB1338282A (en) 1973-11-21
DE2159926C2 (de) 1984-08-02

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