US3891200A - Buffer structure - Google Patents

Buffer structure Download PDF

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Publication number
US3891200A
US3891200A US450309A US45030974A US3891200A US 3891200 A US3891200 A US 3891200A US 450309 A US450309 A US 450309A US 45030974 A US45030974 A US 45030974A US 3891200 A US3891200 A US 3891200A
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US
United States
Prior art keywords
tubular member
buffer
bodies
annular flange
buffer bodies
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
US450309A
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English (en)
Inventor
Wilhelm Schwarz
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.)
VULKAN HAFENTECHNIK GmbH
Original Assignee
Fried Krupp AG
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 Fried Krupp AG filed Critical Fried Krupp AG
Application granted granted Critical
Publication of US3891200A publication Critical patent/US3891200A/en
Assigned to VULKAN HAFENTECHNIK GMBH reassignment VULKAN HAFENTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FRIED. KRUPP GMBH
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • 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
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/40—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers consisting of a stack of similar elements separated by non-elastic intermediate layers

Definitions

  • the present invention relates to a buffer structure.
  • Buffer bodies of cellular elastic material have over bodies with a high modulus of elasticity such as compact bodies of rubber, wood, or steel the disadvantage that they easily buckle under pressure load when the pressed body has a length which is relatively high in comparison to its diameter. This danger of buckling exists already when cellular elastic buffer bodies which are highly porous have a length which only exceeds twice the diameter of the body. Also when a correspondingly long buffer body of circular material is inserted into a tube, a situation occurs which is similar to buckling.
  • the long buffer body will under the effect of a buffer shock deform also in a direction transverse to the direction in which the shock occurs and more specifically will deform in an undulated or zigzag manner so that it will engage the inner surface of the tube at approximately equal longitudinal distances. This results in a jamming of the buffer body so that the desired buffer line of characteristics cannot be realized and the buffer body will have only an insufficient span of useful life.
  • an object of the present invention to provide a buffer structure for long buffer strokes, as they are required for obtaining a high work receiving capability as is needed for instance with airplane towaway bars and with cable line buffers of cable cars, with buffer bodies of cellular material which are guided in a tube while the arrangement will prevent the above mentioned difficulties.
  • FIG. 1 is a section through a buffer according to the present invention.
  • FIGS. 2 and 3 respectively illustrate two cut-outs of buffers of two different embodiments according to the invention.
  • the buffer structure according to the present invention which is intended for long buffer strokes and comprises buffer bodies of a cellular material guided in a tube is characterized primarily in that intermediate elements guided in the tube are interposed between the buffer bodies which when not under load have a radial play relative to the inner surface of the tube.
  • the buffer structure according to the present invention has the advantage that the material of the buffer bodies, although the latter permit considerable buffer strokes will be treated carefully.
  • the relatively short buffer bodies which in unloaded condition have a radial play relative to the tube can similar to the intermediate members for guiding the buffer bodies easily be built into the tube so that the exchange of worn out buffer bodies can be easily and efficiently effected.
  • the intermediate members consist of discs with flanges engaging the inner surface of the tube
  • the additional advantage will be realized that the buckling length of each of the buffer bodies will be reduced by the width of the flanges.
  • FIG. 1 the buffer structure shown in FIG.
  • the buffer body 1 comprises three buffer bodies 1 of a cellular material for instance foamed polyurethane, said buffer bodies 1 being inserted into a tube 2 one behind the other.
  • One end of the tube 2 has welded thereon a connecting plate 3.
  • the outer diameter of the buffer body 1 is in its condition in which it is under no load, shorter than the inner diameter of the tube 2 so that the buffer bodies l have a radial play 4 relative to the inner surface of the tube 2.
  • intermediate members 5 which have an I-profile.
  • These intermediate members 5 each comprise a disc 6 and an annular flange 7 which engages the inner surface of the tube 2.
  • the annular flanges which have a width b taper toward their free ends. However, it is also possiblethat they have the same thickness over their entire widthr'Qne end of the buffer bodies 1 extends into the hollow space formed on both sides of the disc 6 between thetrespective adjacent flanges 7. In a corresponding manner, that buffer body 1 which is closest to the connecting or closure plate 3 fits into a correspondingly shaped depression in a push rod 8.
  • each of the buffer bodies 1 is when said buffer bodies are under no load shorter by the width b of the annular flange 7.
  • the buffer bodies 1 will not buckle when subjected to shocks so that they cannot in a harmful manner unilaterally or alternately one after another be deformed to one or the other side. Instead, the buffer bodies will be upset by a shock load in such a way that their diameter will increase uniformly to all sides. Preferably this occurs to such an extent that the buffer bodies will over their entire circumference engage the inner surface of the tube 2. The friction created in this way results in a desired cushioning of the buffer.
  • the tube 2 and consequently also the annular flanges 7 and the push rod 8 may have a circular cross section or any other suitable cross section for instance square shaped cross section or polygonal cross section.
  • the intermediate members 5 or if desired only the annular flanges 7 may consists of elastic material such as any suitable synthetic plastic material. In such an instance, as shown in FIG. 2, it is advantageous to provide sealing lips 9 (FIG.
  • an intermediate member is built up of two pot-shaped sections 10 of sheet metal the bottoms of which engage each other and are connected to each other in any suitable manner for instance by riveting or screws so that they will together with the portions engaging the inner surface of tube 2 from an I-profile.
  • the intermediate members 5, 10 are expediently made of a material which is a good heat conductor so that .the heat which develops due to the shock loads can properly be conducted away from the inside toward the outside.
  • a buffer structure for relatively large buffer strokes which includes: a tubular member having hollow chamber space therein, a plurality of buffer bodies including ends thereof arranged axially one behind the other in said tubular member, said buffer bodies comprising cellular elastic material and when under no load having a radial play with regard to the inner surface of said tubular member so as to be able to radially expand when being subjected to an axial load, closure means including hollow space.
  • said intermediate elements comprising discs with annular flange means slidably engaging the inner wall surface ofrsaid tubular member, said ends of the buffer bodies being inserted in the hollow chamber space formed by the discs and flange means as well as in the hollow space of the closure means on one end of said tubular member and into hollow space of the end of said push rod means extending into said tubular member, said annular flange means extending on opposite sides of the pertaining discs.
  • annular flange means consist of an elastic material and include sealing means sealingly engaging the respective adjacent inner wall portions of said tubular member.
  • a buffer structure according to claim 1 in which at least some of said intermediate elements include two sections connected to each other and each defining an annular groove, the grooves of each two interconnected sections respectively opening in opposite direction.
  • annular flange means respectively define annular groove means respectively having a portion of an adjacent buffer body located therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Vibration Dampers (AREA)
US450309A 1973-03-17 1974-03-12 Buffer structure Expired - Lifetime US3891200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2313389A DE2313389C3 (de) 1973-03-17 1973-03-17 Puffer

Publications (1)

Publication Number Publication Date
US3891200A true US3891200A (en) 1975-06-24

Family

ID=5875095

Family Applications (1)

Application Number Title Priority Date Filing Date
US450309A Expired - Lifetime US3891200A (en) 1973-03-17 1974-03-12 Buffer structure

Country Status (4)

Country Link
US (1) US3891200A (de)
JP (1) JPS5748700B2 (de)
DE (1) DE2313389C3 (de)
GB (1) GB1426134A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085832A (en) * 1975-05-14 1978-04-25 Gulf & Western Manufacturing Company Multi-chambered foam energy absorber
US4240599A (en) * 1979-04-30 1980-12-23 The United States Of America As Represented By The Secretary Of The Navy Vehicle launching device
US5934420A (en) * 1996-03-28 1999-08-10 Schroeder; Guenter Device for resiliently suspending a piston on a closed-off hydraulic column
US20040094880A1 (en) * 2002-11-18 2004-05-20 Bai-Hsin Lee Polyurethane foam shock absorber

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113883202B (zh) * 2021-12-07 2022-02-18 太原理工大学 一种基于榫卯连接的可复位多稳态吸能组合结构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774951A (en) * 1972-09-20 1973-11-27 Teledyne Mid America Corp Bonded energy absorbing vehicle bumper mount construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774951A (en) * 1972-09-20 1973-11-27 Teledyne Mid America Corp Bonded energy absorbing vehicle bumper mount construction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085832A (en) * 1975-05-14 1978-04-25 Gulf & Western Manufacturing Company Multi-chambered foam energy absorber
US4240599A (en) * 1979-04-30 1980-12-23 The United States Of America As Represented By The Secretary Of The Navy Vehicle launching device
US5934420A (en) * 1996-03-28 1999-08-10 Schroeder; Guenter Device for resiliently suspending a piston on a closed-off hydraulic column
US20040094880A1 (en) * 2002-11-18 2004-05-20 Bai-Hsin Lee Polyurethane foam shock absorber

Also Published As

Publication number Publication date
JPS5748700B2 (de) 1982-10-18
JPS49125786A (de) 1974-12-02
DE2313389B2 (de) 1978-08-31
DE2313389C3 (de) 1979-04-26
DE2313389A1 (de) 1974-09-19
GB1426134A (en) 1976-02-25

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VULKAN HAFENTECHNIK GMBH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FRIED. KRUPP GMBH;REEL/FRAME:005725/0634

Effective date: 19900806