US3789742A - Hydraulic cylinder latch - Google Patents
Hydraulic cylinder latch Download PDFInfo
- 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
- Authority
- 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
Links
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Agricultural Machines (AREA)
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)
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)
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)
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 |
-
1972
- 1972-11-16 US US00307307A patent/US3789742A/en not_active Expired - Lifetime
-
1973
- 1973-05-29 CA CA172,686A patent/CA977006A/en not_active Expired
- 1973-07-25 AU AU58468/73A patent/AU460127B2/en not_active Expired
- 1973-09-04 JP JP48099673A patent/JPS4980481A/ja active Pending
- 1973-10-26 DE DE19732353888 patent/DE2353888A1/de active Pending
- 1973-11-15 GB GB5303573A patent/GB1405991A/en not_active Expired
- 1973-11-15 FR FR7340756A patent/FR2207249B1/fr not_active Expired
Patent Citations (2)
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)
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 |