US3789742A - Hydraulic cylinder latch - Google Patents

Hydraulic cylinder latch Download PDF

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Publication number
US3789742A
US3789742A US00307307A US3789742DA US3789742A US 3789742 A US3789742 A US 3789742A US 00307307 A US00307307 A US 00307307A US 3789742D A US3789742D A US 3789742DA US 3789742 A US3789742 A US 3789742A
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US
United States
Prior art keywords
elongated
arcuated
push rod
hydraulic cylinder
resilient
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
US00307307A
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English (en)
Inventor
G Hershman
W Schwerdtfeger
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.)
Komatsu America International Co
Original Assignee
International Harverster 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 International Harverster Corp filed Critical International Harverster Corp
Application granted granted Critical
Publication of US3789742A publication Critical patent/US3789742A/en
Assigned to DRESSER INDUSTRIES, INC., A CORP. OF DEL. reassignment DRESSER INDUSTRIES, INC., A CORP. OF DEL. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL HARVESTER COMPANY
Assigned to KOMATSU DRESSER COMPANY, E. SUNNYSIDE 7TH ST., LIBERTYVILLE, IL., A GENERAL PARTNERSHIP UNDER THE UNIFORM PARTNERSHIP ACT OF THE STATE OF DE reassignment KOMATSU DRESSER COMPANY, E. SUNNYSIDE 7TH ST., LIBERTYVILLE, IL., A GENERAL PARTNERSHIP UNDER THE UNIFORM PARTNERSHIP ACT OF THE STATE OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DRESSER FINANCE CORPORATION, A CORP. OF DE.
Assigned to DRESSER FINANCE CORPORATION, DALLAS, TX., A DE CORP. reassignment DRESSER FINANCE CORPORATION, DALLAS, TX., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DRESSER INDUSTRIES, INC.
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
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • Still another object of this invention is to provide a latch which is easily adaptable to existing hydraulic cylinders.
  • Still another object of this invention is to provide a latch wherein the amount of force necessary to latch and unlatch is adjustable.
  • this invention provides an improved latch means which automatically locks and unlocks a retracted. push rod of a hydraulic cylinder.
  • the latch includes a series of elongated resilient means, one end thereof being mounted to the hydraulic cylinder. housing the other end being curved.
  • the top resilient strip means has a higher spring rate than that of the lower and a smoother end curve.
  • the lower: strip has a lower spring rate and the end curve is more pronounced and carries a tab which extends backwardly contacting the lower surface of the upper curved end. Together these curves constitute a catch which cooperate with the pusher rod to securely lock it in place.
  • a securing means is movably mounted on the strips and can be fastened to lock the strips together thereby changing their relative spring rate. Additionally an ear or projection can be formed on the pusher rod to cooperate with the catch such that a stronger lockup can be achieved.
  • FIG. 3 is an expanded view of the latch shown in FIG.
  • FIG. 1 showing the action of the locking forces involved.
  • a hydraulic cylinder means 10 which includes a housing means 12 and a rod means 14.
  • the rod means 14 has a boss or eye means 16.
  • the operation of hydraulic cylinder means 10 as well as the other components involved with the assembly are well known in the art and therefore no further discussion will be directed thereto.
  • the removable latch means 18 includes a series of elongated resilient means such as first and second means 20 and 22.
  • first and second resilient means are metal strips each being substantially flat and lying in an abutting relationship for a substantial amount of their respective lengths.
  • the first end means 24 of the elongated resilient means 20 and 22 are secured to a support means 26 whereby they are supported on cylinder housing 12.
  • support means 26 is a block member welded to housing 12.
  • Elongated resilient means 20 and 22 extend substantially parallel to rod means 14 out beyond cylinder end 28 such that a locking relationship can be achieved with said rod means 14.
  • the resilient metal strips 20 and 22 have different spring rates, that is first strip 20 which overlies second strip 22 has a greater spring rate than underlying strip 22.
  • the second end means30 and 32 include arcuated portions 34 and 36.
  • Arcuated section means 36 is provided with a concaved inner surface 38 which grips or engages the rod means. Further, arcuated section 36 is provided with a tab means 40 which bends back from the direction of curvature to a point adjacent the bottom concave surface 42 of arcuated means 34. As is apparent from a consideration of FIGS. 1 and 2 the curve or bend in arcuated means 36 is greater than that in arcuated means 34. The purpose for this as well as the difference in spring rates of the elongated member means will be hereafter made more clear.
  • the latch member 18 is constructed in a manner so that less force is required for the engaging step than during the disengaging step.
  • resilient means 22 is involved during the latching step. Looking at FIG. 3, as catch means 44 is pushed to the right it engages first tab means 40 which in turn transfers force to and along arcuated section 38 due to the noncompressibility of elongated resilient means 22 the curve along arcuated section 38 increases such that point 46 moves upwardly while point 48 pivots downwardly.
  • elongated resilient means 22 has a lower spring rate than that of elongated means 20.
  • An additional feature of this invention is the movable securing means 50 as shown in FIG. 2.
  • the purpose of this movable means is to allow the spring rate of elongated resilient means 22 to be varied within limitations. That is, during the locking procedure as shown in FIG. 3 if the total length of elongated resilient means 22 was free and available for bending a bump or knee might be forced up somewhere therealong instead of having the bend along arcuated section 38.
  • By fastening elongated means 22 to elongated means 20 at some desired position such as securing means 50 it becomes possible to keep all of the bend along articulated section 38 or to allow some of it to form in a knee along the length of the resilient member.
  • a hydraulic cylinder means having a push rod reciprocating therein and a latch means for releasably engaging and securing said push rod when in a retracted position said latch means comprising:
  • first and second elongated resilient means having an abutting parallel relationship, each means having arcuated end means, said arcuated end of said sec- 0nd elongated resilient means having a greater curve than that of said first elongated means and a bend portion contacting said first arcuated end means;
  • said first elongated resilient means has a greater spring rate than said second elongated resilient means
  • said push rod means carries a catch means for engaging said second arcuated end means only whereby the position of the catch means is such that for unlatching said push rod the combined spring rates of said first and second resilient means must be overcome while for latching said push rod only said spring rate of said second resilient means must be overcome.
  • a hydraulic cylinder means having a push rod reciprocating therein and a latch means releasably engaging and securing said push rod when in a retracted position said latch means comprising:
  • first and second elongated resilient means having a parallel adjacent relationship and arcuated section means interacting with said push rod, said first elongated means having a higher spring rate than second elongated means; a connecting means securing said first elongated means to said second elongated means; and a mounting means securing said elongated resilient means to said cylinder means.
  • said push rod means includes a catch means which engages said second arcuated section means.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Agricultural Machines (AREA)
US00307307A 1972-11-16 1972-11-16 Hydraulic cylinder latch Expired - Lifetime US3789742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30730772A 1972-11-16 1972-11-16

Publications (1)

Publication Number Publication Date
US3789742A true US3789742A (en) 1974-02-05

Family

ID=23189153

Family Applications (1)

Application Number Title Priority Date Filing Date
US00307307A Expired - Lifetime US3789742A (en) 1972-11-16 1972-11-16 Hydraulic cylinder latch

Country Status (7)

Country Link
US (1) US3789742A (ja)
JP (1) JPS4980481A (ja)
AU (1) AU460127B2 (ja)
CA (1) CA977006A (ja)
DE (1) DE2353888A1 (ja)
FR (1) FR2207249B1 (ja)
GB (1) GB1405991A (ja)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896729A (en) * 1974-02-27 1975-07-29 Hercules Inc Positive backing sheet plate lock-up
US4078779A (en) * 1975-12-12 1978-03-14 Stabilus Gmbh Pneumatic spring with manually releasable stop
US4288064A (en) * 1980-05-05 1981-09-08 Austen Alfred R Timed-action actuators
US4309027A (en) * 1978-11-28 1982-01-05 Stabilus Gmbh Pneumatic spring having selectively releasable rod-retaining structure
EP0194773A1 (en) * 1985-03-07 1986-09-17 Automotive Products Public Limited Company Hydraulic control apparatus having an installation restraining strap
US4629167A (en) * 1983-07-14 1986-12-16 Nifco, Inc. Piston cylinder type damper
US4664298A (en) * 1985-05-01 1987-05-12 Stewart-Warner Corporation Dual mode grease gun
US4763498A (en) * 1984-12-14 1988-08-16 Fichtel & Sachs Ag Operating device for a central locking installation
EP0300489A2 (en) * 1987-07-24 1989-01-25 SUSPA COMPART Aktiengesellschaft Gas cylinder plunger lock
CN102734262A (zh) * 2012-07-12 2012-10-17 中联重科股份有限公司 驱动缸及具有该驱动缸的起重机和工程机械

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5120074A (ja) * 1974-08-10 1976-02-17 Kubota Ltd Jugaikinzokuseibunoganjusuru kojohaikiodeino shorihoho
NL7600141A (nl) * 1976-01-08 1977-07-12 Lely Nv C Van Der Grondbewerkingsmachine.
DE2619176C2 (de) * 1976-04-30 1982-10-21 Stabilus Gmbh, 5400 Koblenz Gasfeder mit aufgehobener Ausschubkraft bei eingefahrener Kolbenstange
US4551976A (en) * 1982-02-01 1985-11-12 Automotive Products Plc Shipping and installation strap for linear actuator
US4454632A (en) * 1982-02-01 1984-06-19 Automotive Products Plc Shipping and installation strap for linear actuator
DE3809712A1 (de) * 1988-03-23 1989-10-05 Stabilus Gmbh Gasfeder, die gelenkig zwischen einem bauteil und einer an diesem bauteil um eine horizontale achse schwenkbaren klappe angeordnet ist
JPH0749049Y2 (ja) * 1988-10-31 1995-11-13 エスエムシー株式会社 ロック装置付きスライドシリンダ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017157A (en) * 1960-02-11 1962-01-16 Specialties Dev Corp Lanyard actuated valve
US3466008A (en) * 1967-07-17 1969-09-09 Kazuo Kitazawa Butterfly valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017157A (en) * 1960-02-11 1962-01-16 Specialties Dev Corp Lanyard actuated valve
US3466008A (en) * 1967-07-17 1969-09-09 Kazuo Kitazawa Butterfly valve

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896729A (en) * 1974-02-27 1975-07-29 Hercules Inc Positive backing sheet plate lock-up
US4078779A (en) * 1975-12-12 1978-03-14 Stabilus Gmbh Pneumatic spring with manually releasable stop
US4309027A (en) * 1978-11-28 1982-01-05 Stabilus Gmbh Pneumatic spring having selectively releasable rod-retaining structure
US4288064A (en) * 1980-05-05 1981-09-08 Austen Alfred R Timed-action actuators
US4629167A (en) * 1983-07-14 1986-12-16 Nifco, Inc. Piston cylinder type damper
US4763498A (en) * 1984-12-14 1988-08-16 Fichtel & Sachs Ag Operating device for a central locking installation
EP0194773A1 (en) * 1985-03-07 1986-09-17 Automotive Products Public Limited Company Hydraulic control apparatus having an installation restraining strap
US4664298A (en) * 1985-05-01 1987-05-12 Stewart-Warner Corporation Dual mode grease gun
EP0300489A2 (en) * 1987-07-24 1989-01-25 SUSPA COMPART Aktiengesellschaft Gas cylinder plunger lock
EP0300489B1 (en) * 1987-07-24 1992-10-28 SUSPA COMPART Aktiengesellschaft Gas cylinder plunger lock
CN102734262A (zh) * 2012-07-12 2012-10-17 中联重科股份有限公司 驱动缸及具有该驱动缸的起重机和工程机械
CN102734262B (zh) * 2012-07-12 2014-12-24 中联重科股份有限公司 驱动缸及具有该驱动缸的起重机和工程机械

Also Published As

Publication number Publication date
DE2353888A1 (de) 1974-05-30
FR2207249A1 (ja) 1974-06-14
GB1405991A (en) 1975-09-10
CA977006A (en) 1975-10-28
AU460127B2 (en) 1975-04-17
FR2207249B1 (ja) 1976-11-19
JPS4980481A (ja) 1974-08-02
AU5846873A (en) 1975-02-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DRESSER INDUSTRIES, INC., A CORP. OF DEL., STATELE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004130/0646

Effective date: 19821101

Owner name: DRESSER INDUSTRIES, INC., A CORP. OF DEL.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004130/0646

Effective date: 19821101

AS Assignment

Owner name: KOMATSU DRESSER COMPANY, E. SUNNYSIDE 7TH ST., LIB

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DRESSER FINANCE CORPORATION, A CORP. OF DE.;REEL/FRAME:004994/0077

Effective date: 19880901

Owner name: DRESSER FINANCE CORPORATION, DALLAS, TX., A DE COR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DRESSER INDUSTRIES, INC.;REEL/FRAME:004994/0061

Effective date: 19880831