US3857555A - Oil buffer - Google Patents

Oil buffer Download PDF

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Publication number
US3857555A
US3857555A US00400738A US40073873A US3857555A US 3857555 A US3857555 A US 3857555A US 00400738 A US00400738 A US 00400738A US 40073873 A US40073873 A US 40073873A US 3857555 A US3857555 A US 3857555A
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US
United States
Prior art keywords
oil
plunger
cylinder
injection hole
check
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
US00400738A
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English (en)
Inventor
A Mori
N Mitsui
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of US3857555A publication Critical patent/US3857555A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/28—Buffer-stops for cars, cages, or skips
    • B66B5/282—Structure thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
    • F16F9/486—Arrangements for providing different damping effects at different parts of the stroke comprising a pin or stem co-operating with an aperture, e.g. a cylinder-mounted stem co-operating with a hollow piston rod

Definitions

  • This invention relates to an oil buffer, and more particularly to an oil buffer most suited for use in a lift.
  • a return spring is loaded around the control rod disposed in the cylinder, and the plunger is provided with an air hole for ejecting air in the plunger as the latter descends when a shock is developed. Therefore, when air flows out from the air hole during the buffering operation, the oil which has flown into the plunger through an oil hole provided at the bottom of the plunger would be caused to flow out in an atomized state, so that if the device is adapted in an elevator pit, the inside of the pit would be soiled with oil. Also, if the amount of effluent oil is large, it was necessary to supply additional oil at the time of re-starting.
  • An object of the present invention is to provide a device which permits lessening of the amount of oil injected, so as to minimize or unnecessitate additional supply of oil at the time of re-starting.
  • Another object of the present invention is to provide a device in which oil gushed out from the air hole wont be scattered to the surrounding.
  • Still another object of the present invention is to provide a mechanism which permits shortening of the cylinder length.
  • the present invention is aimed at providing an improved oil buffer device in which a tapered control rod is provided in the cylinder and an oil injection hole designed to allow passage of said control rod is provided at the bottom of a plunger arranged slidable in the cylinder, so that oil in said cylinder will be injected into said plunger to perform a buffer action, and further characterized in that an oil check is pro vided at the inside top of said plunger, said oil check being positioned above said injection hole so that the oil injected from said injection hole will be forced back downwardly, and an air hole for ejecting air in the plunger is provided at an upper part of said oil check.
  • FIG. 1 is a general vertical sectional view, as taken from the front side, of an oil'buffer according to an embodiment of the present invention.
  • FIG. 2 is a detail drawing of the spring-loaded portion.
  • a tapered control rod 2 Centrally in a cylinder 1 is provided a tapered control rod 2.
  • a plunger 3 is provided slidably into said cylinder 1 through an injection hole 4 such that when said plunger 3 descends, oil reservoired in the cylinder 1 will be injected into said plunger through said injection hole 4. Since the control rod 2 is tapered upwardly, a large amount of oil is injected in the early stage of de scent of the plunger, but as its descent advances, the
  • a cylindrical oil check 6 which has formed in its side an air hole 5 through which air in the plunger 3 is vented out to urge smooth descent of said plunger 3.
  • This oil check 6 is so arranged that when oil is injected from the. injection hole 4, such injected oil will be forced back downwardly upon hitting its underside 6A so as to minimize oil effluence from the air hole 5.
  • a box-shaped hollow support 7 which is communicated with the inside of the oil check 6 through an opening 8.
  • a rubber seat 9 adapted to preclude or minimize damage when an object to be buffered strikes down thereagainst.
  • cylindrical bodies ll, 11 the inside of which is communicated with the inside of the support 7 through holes 12, 12, respectively.
  • cylindrical bodies 13, 13 supported by the supporting arms l4, 14 which are secured to the outer periphery of the cylinder 1.
  • Said cylindrical bodies l3, 13' are designed to receive therein said cylindrical bodies 11, 11', respectively.
  • plunger-returning coil springs 15, 15 composed from several pieces of short springs. In the conventional devices, such coil spring was mounted around the control rod in the inside of the cylinder, so that if the coil spring is made longer,its flexed portion is also elongated, necessitating equivalent elongation of the cylinder length.
  • the coil springs are disposed between the bottom end of the support 7 on the outside of the cylinder and the supporting arms 14, 14', so that their length can be sufficiently absorbed to unnecessitate under elongation of the cylinder.
  • the coil spring 15 is formed from a single piece of spring, its manufacture is attended by great difficulty.
  • since such coil spring is disposed outside of the cylinder, it can be composed from combination of several pieces of short coil springs 15A, 15B, 15C, thus allowing obtainment of high-efficiency coil springs with high productivity.
  • Said coil springs ISA, 15B, 15C are connected through spring seats 16 as shown in FIG. 2.
  • oil receivers l8 on the base 17 to which the cylinder 1 is secured.
  • an object to be buffered for example an elevator cage
  • the plunger 3 descends, causing oil in the cylinder 1 to gush out from the oil hole 4.
  • the thus ejected oil is mostly forced back downwardly by the underside 6A of the oil check 6, a portion of such oil flows into the oil check through the air hole 5 and hence further into the supporter 7 through hole 8 whence said oil further flows into the cylindrical bodies 11, 11 through holes l2, 12
  • An oil buffer in which a tapered control rod is provided in a cylinder fixedly erected on a base and an oil injection hole arranged to allow passage of said control rod is provided at the bottom of a plunger arranged slidable in said cylinder so that oil in said cylinder will be injected into said plunger through the space between said control rod and injection hole so as to produce a buffer action, and further characterized in that an oil check is provided at the inside top of said plunger, said oil check having the underside positioned above said injection hole'so as to force back downwardly the oil which gushes out from said injection hole, and that air holes for ejecting air in the plunger are provided in the upper parts of said oil check.
  • oil buffer according to claim 1 wherein said oil check is composed from a hollow cylindrical body having an oil-checking bottom, said cylindrical body also having formed above its bottom an air ejecting hole and a hole for communicating the inside of said oil check with the outside thereof.
  • each said return coil spring is constituted from several pieces of short coil springs.
  • An oil buffer in which a tapered control rod is provided in a cylinder fixedly erected on a base and an oil injection hole arranged to allow passage of said control rod is provided at the bottom of a plunger arranged slidable in said cylinder so that oil in said cylinder will be injected into said plunger through the space between said control rod and injection hole so as to produce a buffer action, characterized in that an oil check is provided at the inside top of said plunger, said oil check having the underside positioned above said oil injection hole so as to force back downwardly the oil which gushes out from said injection hole, and in that air holes for ejecting air in the plunger are provided in the upper parts of said oil check, a box-shaped supporter is provided at the top of said plunger, the inside of said supporter being communicated with the inside of said plunger through a hole and also communicated with oil receivers through cylindrical bodies.
  • An oil buffer in which a tapered control rod is provided in a cylinder fixedly erected on a base and an oil injection hole arranged to allow passage of said control rod is provided at the bottom of a plunger arranged slidably in said cylinder so that the oil in said cylinder will be injected into said plunger through the space between said control rod and injection hole so as to produce a buffer action, characterized in that said plunger is provided at its upper portion with a box-shaped supporter, the inside of said box-shaped supporter is communicated with the inside of said plunger through a hole, and spring guide members are provided and mounted on said box-shaped supporter at positions located separately from said plunger, and in that coil springs are provided for returning the plunger after each operation, said coil springs being disposed around each of said coil spring guide members.
  • each of said return coil springs is composed of several pieces of short coil springs.
  • coil spring guide members are composed of hollow cylindrical bodies which are provided for oil passages, and wherein oil receiving means are provided on said base, said box-shaped supporter communicating with said oil receivers through said hollow cylindrical bodms.
  • An oil buffer according to claim 7, wherein said oil check is composed of a hollow cylinder having an oil-checking bottom portion, said cylindrical body having formed above said bottom portion said air holes and said hole communicating the inside of said plunger with said box-shaped supporter.
  • a fluid buffer arrangement comprising: a base means, a cylinder means disposed on said base means having a quantity of fluid disposed therein, plunger means slidably disposed in said cylinder means, means provided at one end of said plunger means for communicating said plunger means with said cylinder means, control means for selectively controlling said means for communicating, a hollow support means disposed at the other end of said plunger means, means provided in said hollow support means for communicating said plunger means with said hollow support means, fluid receiver means disposed on said base means separate from said cylinder means, and means disposed on said hollow support means for communicating said hollow support means with said fluid receiver means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Actuator (AREA)
US00400738A 1972-09-29 1973-09-26 Oil buffer Expired - Lifetime US3857555A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47096988A JPS5216555B2 (ja) 1972-09-29 1972-09-29

Publications (1)

Publication Number Publication Date
US3857555A true US3857555A (en) 1974-12-31

Family

ID=14179573

Family Applications (1)

Application Number Title Priority Date Filing Date
US00400738A Expired - Lifetime US3857555A (en) 1972-09-29 1973-09-26 Oil buffer

Country Status (4)

Country Link
US (1) US3857555A (ja)
JP (1) JPS5216555B2 (ja)
CA (1) CA986430A (ja)
GB (1) GB1427055A (ja)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964491A (en) * 1989-07-11 1990-10-23 The United States Of America As Represented By The Secretary Of The Navy System for limiting snap load intensity
US5639059A (en) * 1994-03-22 1997-06-17 Nash; Adrian Support for a seat
AU695265B2 (en) * 1994-03-22 1998-08-13 Adrian Nash A support for a seat
US20030217895A1 (en) * 2002-05-21 2003-11-27 Mitsubishi Denki Kabushiki Kaisha Buffer device for elevator
US20100307871A1 (en) * 2007-08-31 2010-12-09 Mitsubishi Electric Corporation Oil buffer for an elevator
CN102718104A (zh) * 2012-07-10 2012-10-10 江南大学 机械式耗能型电梯缓冲器
CN105110134A (zh) * 2015-09-14 2015-12-02 恒达富士电梯有限公司 乘客电梯的保护型底坑结构
CN106829688A (zh) * 2017-04-18 2017-06-13 福建北大高科发展有限公司 一种电梯井内防护性轿厢缓冲装置
CN108715387A (zh) * 2018-07-18 2018-10-30 康达电梯有限公司 一种安全防护电梯
CN110671461A (zh) * 2019-09-26 2020-01-10 徐州天泓传动设备有限公司 一种具有多重缓冲机构的气弹簧
CN111320052A (zh) * 2020-03-10 2020-06-23 刘奕哲 一种非金属复合材料制成的电梯缓冲装置及其制品

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835435C3 (de) * 1978-08-12 1981-04-23 Witzenmann Gmbh Metallschlauch-Fabrik Pforzheim, 7530 Pforzheim Federhänger bzw. -stütze, insbesondere für Rohrleitungen
JPS60137766U (ja) * 1984-12-20 1985-09-12 三菱電機株式会社 エレベ−タの油入緩衝器
DE3630549A1 (de) * 1986-09-08 1988-03-10 Mueller Bbm Gmbh Vorrichtung zur in vertikaler richtung federnden lagerung von schwingungen unterworfenen lasten
DE4223786A1 (de) * 1992-07-15 1994-01-20 Gerb Schwingungsisolierungen Schwingungsdämpfer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1125942A (en) * 1911-06-07 1915-01-26 Alva W Blanchard Shock-absorber.
US3033384A (en) * 1959-12-07 1962-05-08 Nat Castings Co Hydraulic draft gear

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1125942A (en) * 1911-06-07 1915-01-26 Alva W Blanchard Shock-absorber.
US3033384A (en) * 1959-12-07 1962-05-08 Nat Castings Co Hydraulic draft gear

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964491A (en) * 1989-07-11 1990-10-23 The United States Of America As Represented By The Secretary Of The Navy System for limiting snap load intensity
US5639059A (en) * 1994-03-22 1997-06-17 Nash; Adrian Support for a seat
AU695265B2 (en) * 1994-03-22 1998-08-13 Adrian Nash A support for a seat
US20030217895A1 (en) * 2002-05-21 2003-11-27 Mitsubishi Denki Kabushiki Kaisha Buffer device for elevator
US20060231349A1 (en) * 2002-05-21 2006-10-19 Mitsubishi Denki Kabushiki Kaisha Buffer device for elevator
US20060249334A1 (en) * 2002-05-21 2006-11-09 Mitsubishi Denki Kabushiki Kaisha Buffer device for elevator
US7287626B2 (en) 2002-05-21 2007-10-30 Mitsubishi Denki Kabushiki Kaisha Buffer device for elevator
US8360210B2 (en) * 2007-08-31 2013-01-29 Mitsubishi Electric Corporation Oil buffer for an elevator
US20100307871A1 (en) * 2007-08-31 2010-12-09 Mitsubishi Electric Corporation Oil buffer for an elevator
CN102718104A (zh) * 2012-07-10 2012-10-10 江南大学 机械式耗能型电梯缓冲器
CN102718104B (zh) * 2012-07-10 2014-05-21 江南大学 机械式耗能型电梯缓冲器
CN105110134A (zh) * 2015-09-14 2015-12-02 恒达富士电梯有限公司 乘客电梯的保护型底坑结构
CN106829688A (zh) * 2017-04-18 2017-06-13 福建北大高科发展有限公司 一种电梯井内防护性轿厢缓冲装置
CN106829688B (zh) * 2017-04-18 2018-10-26 福建北大高科发展有限公司 一种电梯井内防护性轿厢缓冲装置
CN108715387A (zh) * 2018-07-18 2018-10-30 康达电梯有限公司 一种安全防护电梯
CN110671461A (zh) * 2019-09-26 2020-01-10 徐州天泓传动设备有限公司 一种具有多重缓冲机构的气弹簧
CN111320052A (zh) * 2020-03-10 2020-06-23 刘奕哲 一种非金属复合材料制成的电梯缓冲装置及其制品

Also Published As

Publication number Publication date
JPS5216555B2 (ja) 1977-05-10
JPS4956084A (ja) 1974-05-30
CA986430A (en) 1976-03-30
GB1427055A (en) 1976-03-03

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