US3548717A - Control for gas-powered motor - Google Patents

Control for gas-powered motor Download PDF

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Publication number
US3548717A
US3548717A US833485A US3548717DA US3548717A US 3548717 A US3548717 A US 3548717A US 833485 A US833485 A US 833485A US 3548717D A US3548717D A US 3548717DA US 3548717 A US3548717 A US 3548717A
Authority
US
United States
Prior art keywords
drive sleeve
valve
control
spring
spool
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
US833485A
Other languages
English (en)
Inventor
Charles Passaggio
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.)
Schrader Automotive Inc
Original Assignee
Scovill Inc
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 Scovill Inc filed Critical Scovill Inc
Application granted granted Critical
Publication of US3548717A publication Critical patent/US3548717A/en
Assigned to SCHRADER AUTOMOTIVE, INC. reassignment SCHRADER AUTOMOTIVE, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCOVILL INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F01B17/02—Engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle

Definitions

  • a control valve for a reciprocating fluid motor comprises a ported body with a spool valve therein.
  • a spool valve is driven by a drive sleeve through lost motion means.
  • the drive sleeve is assisted by spring means engaging in indentations in the drive sleeve, positioned and'proportioned'so that the spring means is urging the spool valve onward when the valve is at its null points.
  • This invention relates to a gas-powered motor of the reciprocating type in which the piston or other power element reciprocates the control valve to alternate the pressure side of the piston. More specifically, in such a motor this invention relates to control valve drive means especially structured to avoid hang-ups of the valve at the valve null points.
  • an improvement on the earlier structure now eliminates the possibility of null point hang-ups by interposing between the spool valve and the control rod a drive sleeve element against which the spring detent operates.
  • the spool valve and the drive sleeve are so structured that the spool valve movement is not commenced until the drive sleeve has reached a point where its forward motion to the end of its travel is assured. Further, lost motion between the drive sleeve and the valve is such that the spring detent is working on a downhill slope when the valve is at the null point either on the upstroke or the downstroke.
  • FIG. 1 is a sectional view of a motor having a control embodying the invention
  • FIG. 2 is an enlarged sectional view taken on the line 2-2 of FIG. 1;
  • FIG. 3 is an enlarged fragmentary sectional view of a control embodying the invention and showing the control rod after the commencement of its downstroke;
  • FIG. 4 is a fragmentary sectional view showing the control rod at its lowermost position.
  • a motor embodying the invention is generally designated in FIG. 1. It comprises a housing 12 having a piston or diaphragm 14 power element in its power chamber.
  • the piston may be connected through appropriate means to drive a pump 16 with which this invention is not concerned.
  • the housing includes a control cavity 18 to which a vacuum source conduit 20 is connected. Passages 22 and 24 in the housing connect the control chamber respectively with the.
  • the control cavity as shown in FIG. 3 terminates in an open end of the housing and from this end into the cavity extends the cavity liner 26.
  • the liner is formed with a plurality of Iongitudinally spaced outward circumferential flanges 28, 30, 32, and 34. The annular spaces between the circumferential flanges are aligned with the passages 22, 20 and 24 respectively, and ports 36, 38 and 40 are provided through the liner at their respective levels.
  • a tubular spool valve element 42 is slideably disposed within the liner and has end flanges 44 and 46 spaced so that the indentation between the flanges permits port 38 to communicate with ports 36 and 40 depending on whether the spool element 42 is up or down.
  • a drive sleeve 48 is slideably disposed inside the liner and housing. At its lower end, the drive sleeve is slidably surrounded by the spool valve element 42. In FIG. 3, a shoulder 50 is formed on the drive sleeve to abut the upper end of the spool element. At the lower end, a stop ring 52 is disposed in an annular groove in the drive spool spaced from the shoulder 50 somewhat more than the length of the spool element for reasons which will be understood.
  • An upwardly facing internal shoulder 54 is formed in the drive spool and a downwardly facing shoulder 56 is spaced from and opposes the shoulder 54.
  • the downwardly facing shoulder 56 may be'in the bottom end of the plug 58 secured in the upper end of the drive sleeve.
  • a deep annular channel 60 which carries a garter spring 62.
  • On the drive sleeve are formed spaced circumferential indentations 64 and 66 with a rounded peak 68 therebetween.
  • the valleys of the indentations 64 and 66 are spaced apart a distance equal to the length of travel of the spool valve element 42 plus the lost motion space S shown between the stop ring 52 and the lower end of the valve element (FIG. 3).
  • the compression the garter spring 62 is such that it urges the drive sleeve toward positions in which the garter spring engages the deepest part of the respective indentations 64 and 66.
  • the piston or diaphragm 14 is linked to an upwardly extending control rod 70.
  • This rod is reduced adjacent its upper end to receive a pair of opposed sliding bushings 72 and 74.
  • a nut 76 is secured to the threaded upper end of the rod.
  • An axial spring 78 is disposed between the flanges of the bushings.
  • a gas-powered, self-reciprocating motor having a housing with a power element therein operated on opposite sides alternately by gas under greater pressure, the power element driving a control rod extending into a control cavity in the housing, a drive sleeve reciprocal in the control cavity and surrounding the end of the rod and reciprocable longitudinally of the cavity by lost motion means moved by the control rod as the rod reciprocates, the drive sleeve being formed with a pair of longitudinally spaced indentations, spring-pressed means v stationed in the side of the cavity and extending alternately into said indentations as the drive sleeve reciprocates, the indentations having sloping walls so that once the sloping wall of the approaching indentation is opposite and engaged by the spring-pressed means the movement of the drive sleeve in the direction of the approaching indentation is assisted, and a spool valve element operable as it reciprocates in the cavity with passages in the housing to communicate power fluid alternately to the opposite sides of the piston

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Magnetically Actuated Valves (AREA)
US833485A 1969-06-16 1969-06-16 Control for gas-powered motor Expired - Lifetime US3548717A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83348569A 1969-06-16 1969-06-16

Publications (1)

Publication Number Publication Date
US3548717A true US3548717A (en) 1970-12-22

Family

ID=25264543

Family Applications (1)

Application Number Title Priority Date Filing Date
US833485A Expired - Lifetime US3548717A (en) 1969-06-16 1969-06-16 Control for gas-powered motor

Country Status (4)

Country Link
US (1) US3548717A (de)
DE (1) DE2029711A1 (de)
FR (1) FR2051071A5 (de)
GB (1) GB1282360A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664377A (en) * 1970-09-21 1972-05-23 Scovill Manufacturing Co Control for a reciprocating fluid motor
US4550642A (en) * 1984-11-02 1985-11-05 Nordson Corporation Fluid pressure operated piston engine assembly
WO1990000221A1 (en) * 1988-06-27 1990-01-11 Brown Harold D Automatically-reversing piston-and-cylinder unit
US5092746A (en) * 1989-05-19 1992-03-03 Pressol Schmiergerate Gmbh Air-operated lubricant pump
US5137436A (en) * 1989-04-22 1992-08-11 Alfred Teves Gmbh Device for the generation of auxiliary pressure
US5275540A (en) * 1992-03-17 1994-01-04 Brown Harold D Linear fluid motor system
CN110329593A (zh) * 2019-06-24 2019-10-15 哈尔滨科海机械设备制造有限公司 真空抽取机上吸头装置及使用方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140097A (en) * 1983-05-19 1984-11-21 Kenneth Ian Fitzsimmonds Valve system
DE102020120204A1 (de) 2020-07-30 2022-02-03 Peter Pelz Hub-Vorrichtung und Membran-Eintakt-Motor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664377A (en) * 1970-09-21 1972-05-23 Scovill Manufacturing Co Control for a reciprocating fluid motor
US4550642A (en) * 1984-11-02 1985-11-05 Nordson Corporation Fluid pressure operated piston engine assembly
WO1990000221A1 (en) * 1988-06-27 1990-01-11 Brown Harold D Automatically-reversing piston-and-cylinder unit
US4899638A (en) * 1988-06-27 1990-02-13 Brown Harold D Automatically-reversing piston-and-cylinder unit
US5137436A (en) * 1989-04-22 1992-08-11 Alfred Teves Gmbh Device for the generation of auxiliary pressure
US5092746A (en) * 1989-05-19 1992-03-03 Pressol Schmiergerate Gmbh Air-operated lubricant pump
US5275540A (en) * 1992-03-17 1994-01-04 Brown Harold D Linear fluid motor system
CN110329593A (zh) * 2019-06-24 2019-10-15 哈尔滨科海机械设备制造有限公司 真空抽取机上吸头装置及使用方法
CN110329593B (zh) * 2019-06-24 2024-03-15 哈尔滨科海机械设备制造有限公司 真空抽取机上吸头装置及使用方法

Also Published As

Publication number Publication date
GB1282360A (en) 1972-07-19
DE2029711A1 (de) 1970-12-17
FR2051071A5 (de) 1971-04-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SCHRADER AUTOMOTIVE, INC., 566 MAINSTREAM DRIVE, N

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCOVILL INC.;REEL/FRAME:004499/0992

Effective date: 19851028