GB1313706A - Hydraulic actuators - Google Patents

Hydraulic actuators

Info

Publication number
GB1313706A
GB1313706A GB2305670A GB2305670A GB1313706A GB 1313706 A GB1313706 A GB 1313706A GB 2305670 A GB2305670 A GB 2305670A GB 2305670 A GB2305670 A GB 2305670A GB 1313706 A GB1313706 A GB 1313706A
Authority
GB
United Kingdom
Prior art keywords
piston
rod
cylinder
stops
pressure
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
Application number
GB2305670A
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.)
LIR SpA LAB ITALIANO RECERCHE
Original Assignee
LIR SpA LAB ITALIANO RECERCHE
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 LIR SpA LAB ITALIANO RECERCHE filed Critical LIR SpA LAB ITALIANO RECERCHE
Publication of GB1313706A publication Critical patent/GB1313706A/en
Expired legal-status Critical Current

Links

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

1313706 Hydraulic actuators LIR SpA LABORATORIO ITALIANO RECERCHE 13 May 1970 [14 May 1969J 23056/70 Heading F1D A hydraulic stepping motor comprises a cylinder 101 Fig.1 having n e.g., three selectively operable fluid feeds 113, 115, 117, stops 105, 107, 109, 111 on the inner wall of the cylinder, a main piston 121 mounted on a rod extending through the lower end of the cylinder, stops arranged axially along the piston rod, and formed by axially spaced portions 123, 127, 131, n-1 pistons 133, 135 freely mounted on piston rod portions 125, 129 for linear movement between respective pairs of the piston rod stops and cylinder wall stops: the arrangement being that the rod is linearly displaceable into a selected one of 2<n> positions by pressure fluid fed through a selected feed or combination of feeds and discharged from the cylinder through other feeds represented by 1 and 0 in the binary code system. Fig.1 shows system 0. 0. 0 wherein the rod is biased to its uppermost position by a spring 139 of thrust less than the downward force exerted by fluid-pressure when present against the upper annular face of piston 133. With system 0. 0. 1 i.e. pressure at 117 and exhaust at 113, 115 as shown in Fig. 2 piston 133 moves upwardly to abut stop 107 and piston 121 and its rod move downwardly until'the upper end of rod portion 125 abuts the upper end of piston 133. Piston 135 which is linked to piston 133 by a tie rod 137c is subjected to no force except gravity and may assume the position shown. On applying fluid-pressure to feed 115 only i.e., system 0. 1. 0 as shown in Fig.3 piston 135 is held against stop 111 and piston 133 is moved downwardly until the tie rod is fully extended at which position the piston rod is urged by spring 139 against the lower end of piston 133. The lower end of the rod extends from the cylinder slightly more than is shown in Fig.3. The remaining five systems 0. 1. 1, 1. 0. 0, 1. 0. 1, 1. 1. 0, 1. 1.1. are as in Figs. 4 to 8 (not shown).
GB2305670A 1969-05-14 1970-05-13 Hydraulic actuators Expired GB1313706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT458569 1969-05-14

Publications (1)

Publication Number Publication Date
GB1313706A true GB1313706A (en) 1973-04-18

Family

ID=11112767

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2305670A Expired GB1313706A (en) 1969-05-14 1970-05-13 Hydraulic actuators

Country Status (4)

Country Link
JP (1) JPS504832B1 (en)
CH (1) CH514789A (en)
DE (1) DE2023704A1 (en)
GB (1) GB1313706A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431054A1 (en) * 1978-07-12 1980-02-08 Fiat Ricerche FLUID CONTROL DEVICE

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205594A (en) * 1977-08-08 1980-06-03 Burke Martin F Fluid operated apparatus
JPH0292729U (en) * 1989-01-09 1990-07-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431054A1 (en) * 1978-07-12 1980-02-08 Fiat Ricerche FLUID CONTROL DEVICE

Also Published As

Publication number Publication date
CH514789A (en) 1971-10-31
JPS504832B1 (en) 1975-02-24
DE2023704A1 (en) 1970-11-19

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees