US3883917A - Bridge for ramps - Google Patents

Bridge for ramps Download PDF

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Publication number
US3883917A
US3883917A US416391A US41639173A US3883917A US 3883917 A US3883917 A US 3883917A US 416391 A US416391 A US 416391A US 41639173 A US41639173 A US 41639173A US 3883917 A US3883917 A US 3883917A
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US
United States
Prior art keywords
bridge plate
bridge
lever
cam surface
ramp
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
US416391A
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English (en)
Inventor
Kurt Alten
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3883917A publication Critical patent/US3883917A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/28—Loading ramps; Loading docks
    • B65G69/2805—Loading ramps; Loading docks permanently installed on the dock
    • B65G69/2811—Loading ramps; Loading docks permanently installed on the dock pivoting ramps
    • B65G69/2835—Loading ramps; Loading docks permanently installed on the dock pivoting ramps with spring-operated means

Definitions

  • ABSTRACT A ramp having a bridge structure pivotally connected thereto for transferring a load onto and from the ramp and including a bridge plate having one end hinged to the ramp for selectively pivoting the bridge plate from a substantially vertical or rest position to an at least approximately horizontal or use position while tension spring means have one end connected to the ramp and the other end to the free end of a lever which is pivotable about an axis substantially parallel to the pivot axis of the bridge plate but is spaced from this last mentioned pivot axis.
  • the free end of the lever carries a roller which engages and is adapted to roll on a cam surface of a cam connected to the bridge plate.
  • the tension spring means varies its length when the roller moves on the cam surface during the pivoting of the bridge plate from its rest position to its use position and is shortest in its rest position.
  • the present invention relates to a bridge for ramps with a bridge plate which is pivotally arranged at the rear end of the ramp and which is movable from its substantially vertical rest position against the effect of a spring-loaded lever pivotable about a vertical axis, into its substantially horizontal position of use while the free lever end engages the bridge plate by means of a cam disc.
  • Bridges of this type are known according to which the spring acting upon the lever is a torsion spring which extends approximately over the width of the bridge and is located within the region of the linkage area of the bridge plate.
  • the torsion spring In view of the relatively large deviating travel which the torsion spring has to perform, the torsion spring has a length corresponding to the widtl: of the bridge. Therefore, also the lever which is loaded by the effect of the torsion spring has to engage a bridge rim or has to be built in at said bridge rim.
  • FIG. 1 illustrates a bridge linked to a marginal area of a ramp and occupying its rest position, the bridge of FIG. 1 being shown as viewed from below.
  • FIG. 2 represents a section taken along the line II-ll of FIG. 1.
  • the bridge for ramps which is provided with a bridge plate that is pivotally arranged at the rear end of the ramp and which is movable from its approximately vertical rest position against the effect of a spring-loaded lever pivotable about a horizontal axis, into a substantially horizontal position of use while the free lever end engages the bridge plate by means of a cam path and while the spring acting upon the lever relaxes when pivoting the bridge plate upwardly, is characterized primarily in that the spring acting upon the lever is a tension spring which has one end within the region of the free lever end and has its other end within the region of the pivot axis of the bridge plate.
  • the bridge plate 1 which may be reinforced by longitudinally extending hollow beams 2, is by hinge means 3 pivotally connected to the rim portion of the ramp 4.
  • a flatiron 5 which supports the hinge means 3 may be fixedly connected to the ramp 4 or if desired may also be longitudinally displaceable on the ramp 4.
  • the drawing shows the bridge in its vertical rest position. When the bridge is in its operative position or position of use, the bridge plate 1 rests by means of its front portion 6 on the vehicle or the like.
  • a cam 7 Centrally below the bridge plate 1 there is arranged a cam 7 which is formed by a flatiron 8 extending vertically with regard to the bridge plate 1 and in the longitudinal direction of the latter.
  • the cam 7 guides a roller 9 with a central circumferential groove having a width corresponding to the thickness of the flatiron 8.
  • This roller is mounted on a bolt 10 the ends of which are connected to the free end of a lever 11 having its front portion forked.
  • the lower end of this lever 11 is pivotally journalled on arms 12 which are fixedly connected to the flatiron 5.
  • the pivot axis of lever 11 extends parallel to the axis of the hinge means 3.
  • the two tension springs 15 are preloaded. In order that this position can be maintained, the protrusions 17 of the lever 11 catch behind a transverse member 18 of the flatiron 8. However, if desired, the rest position of the bridge may also be secured by other detachable arresting means.
  • bridge plate 1 rests during the pivoting movement in downward direction on the roller 9 or the free end of the lever 11 which in its turn can be pivoted downwardly only while tensioning the tension springs 15.
  • the roller 9 moves on the cam 7 forwardly in the direction toward the front end 6 of the bridge. If desired, the traverse 14 may be caught by an elastic abutment 19.
  • the bridge plate 1 is manually pivoted upwardly. This is possible without any difficulties, i.e., while only using small forces, because the tension springs 15 will be preloaded when the bridge plate is lowered. Due to the above mentioned lever arrangement in cooperation with the springs 15 and due to the illustrated S-shaped configuration of the path of cam 7, the goal will be realized that when pivoting the bridge upwardly, the necessary force will be uniform over the entire pivot range.
  • the two springs 15 are so dimensioned that the required force will be low.
  • the S-shaped path of cam 7 will be particularly favorable when this path in the first portion (approximately the first half) is concave and in the second or last portion is convex.
  • the lever length corresponds in this connection approximately to half the length of the bridge plate, and the tension springs 15 will in the rest position of the bridge define together with the then vertical lever 11 an angle of approximately from 12 to 18.
  • the distance of the lever 11 from the bridge plate corresponds to approximately the distance a (hinge means lower pivot area).
  • a bridge structure pivotally connected to said ramp for transferring a load over said bridge structure onto and from said ramp, said bridge structure including: a bridge plate. hinge means hingedly connecting one end portion of said bridge plate to said ramp for selectively pivoting said bridge plate about the axis of said hinge means from a substantially vertical rest position to an at least approximately horizontal position of use and vice versa, tension lever means pivotally supported by said ramp for pivoting about an axis substantially parallel to the axis of said hinge means and located in spaced relationship thereto, spring means having one end thereof anchored within the region of said axis of said hinge means and having the other end anchored within the region of the free end of said lever means, and cam means connected to said bridge plate and having a cam surface support ing said free end of said lever means, said spring means continuously urging said free end of said lever means toward said cam surface and having its shortest extension when said bridge plate occupies its substantially vertical rest position, that end of said tension spring means which is within the region of the axis of said hinge means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Toys (AREA)
  • Ink Jet (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)
  • Holders For Apparel And Elements Relating To Apparel (AREA)
  • Ladders (AREA)
US416391A 1972-11-20 1973-11-16 Bridge for ramps Expired - Lifetime US3883917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2256802A DE2256802A1 (de) 1972-11-20 1972-11-20 Ueberfahrbruecke fuer rampen

Publications (1)

Publication Number Publication Date
US3883917A true US3883917A (en) 1975-05-20

Family

ID=5862202

Family Applications (1)

Application Number Title Priority Date Filing Date
US416391A Expired - Lifetime US3883917A (en) 1972-11-20 1973-11-16 Bridge for ramps

Country Status (7)

Country Link
US (1) US3883917A (OSRAM)
JP (1) JPS4982143A (OSRAM)
CH (1) CH564472A5 (OSRAM)
DE (1) DE2256802A1 (OSRAM)
FR (1) FR2327177A1 (OSRAM)
GB (1) GB1414708A (OSRAM)
NL (1) NL7315615A (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453807A1 (fr) * 1979-04-12 1980-11-07 Alten K Passerelle de transbordement pour rampes
US4488326A (en) * 1982-09-30 1984-12-18 Autoquip Corporation Pallet dock lift
US4825493A (en) * 1987-08-12 1989-05-02 Ti Serco Corporation Dock-leveler lock
US5117526A (en) * 1990-05-03 1992-06-02 The Serco Corporation Vertically storing dock leveler
US20120180233A1 (en) * 2006-12-14 2012-07-19 Paul Belongia Stop and lock for a vertically storing dock leveler
US12319523B2 (en) 2022-05-12 2025-06-03 Overhead Door Corporatior Dock leveler with lip hinge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62140035U (OSRAM) * 1986-02-25 1987-09-03
DE8812582U1 (de) * 1988-10-06 1988-12-08 Industrieberatung - Technischer Vertrieb Hecker - Gössl, 5354 Weilerswist Überladebrücke
JP4952142B2 (ja) * 2006-08-22 2012-06-13 株式会社日立プラントテクノロジー ポンプ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235896A (en) * 1963-11-18 1966-02-22 Unarco Industries Dockboard
US3327335A (en) * 1965-06-30 1967-06-27 Loomis Machine Company Dockboard
US3411168A (en) * 1966-06-20 1968-11-19 Loomis Machine Company Dockboard
US3460175A (en) * 1967-08-02 1969-08-12 Loomis Machine Co Dockboard assembly
US3662416A (en) * 1970-12-29 1972-05-16 Serco Eng Ltd Dockboards

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235896A (en) * 1963-11-18 1966-02-22 Unarco Industries Dockboard
US3327335A (en) * 1965-06-30 1967-06-27 Loomis Machine Company Dockboard
US3411168A (en) * 1966-06-20 1968-11-19 Loomis Machine Company Dockboard
US3460175A (en) * 1967-08-02 1969-08-12 Loomis Machine Co Dockboard assembly
US3662416A (en) * 1970-12-29 1972-05-16 Serco Eng Ltd Dockboards

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2453807A1 (fr) * 1979-04-12 1980-11-07 Alten K Passerelle de transbordement pour rampes
US4488326A (en) * 1982-09-30 1984-12-18 Autoquip Corporation Pallet dock lift
US4825493A (en) * 1987-08-12 1989-05-02 Ti Serco Corporation Dock-leveler lock
US5117526A (en) * 1990-05-03 1992-06-02 The Serco Corporation Vertically storing dock leveler
US20120180233A1 (en) * 2006-12-14 2012-07-19 Paul Belongia Stop and lock for a vertically storing dock leveler
US8464384B2 (en) * 2006-12-14 2013-06-18 Rite-Hite Holding Corporation Stop and lock for a vertically storing dock leveler
US12319523B2 (en) 2022-05-12 2025-06-03 Overhead Door Corporatior Dock leveler with lip hinge

Also Published As

Publication number Publication date
JPS4982143A (OSRAM) 1974-08-07
FR2327177A1 (fr) 1977-05-06
FR2327177B1 (OSRAM) 1978-04-21
NL7315615A (OSRAM) 1974-05-22
CH564472A5 (OSRAM) 1975-07-31
GB1414708A (en) 1975-11-19
DE2256802A1 (de) 1974-05-30

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