EP0566195B1 - Safety ratchet device - Google Patents

Safety ratchet device Download PDF

Info

Publication number
EP0566195B1
EP0566195B1 EP93201038A EP93201038A EP0566195B1 EP 0566195 B1 EP0566195 B1 EP 0566195B1 EP 93201038 A EP93201038 A EP 93201038A EP 93201038 A EP93201038 A EP 93201038A EP 0566195 B1 EP0566195 B1 EP 0566195B1
Authority
EP
European Patent Office
Prior art keywords
ratchet
stop
plunger
ratchet element
safety
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
EP93201038A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0566195A1 (en
Inventor
Jan Willem Fijnvandraat
Jan Berends
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.)
Stertil BV
Original Assignee
Stertil BV
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 Stertil BV filed Critical Stertil BV
Publication of EP0566195A1 publication Critical patent/EP0566195A1/en
Application granted granted Critical
Publication of EP0566195B1 publication Critical patent/EP0566195B1/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
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/04—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars hydraulically or pneumatically operated

Definitions

  • the invention relates to a safety ratchet device for preventing an undesired relative movement of two members movable relative to one another in a lengthwise direction.
  • Such a safety ratchet device is used for instance in vehicle lifting devices to prevent a lifted vehicle falling downward when a component of the lifting device gives way.
  • the invention has for its object to provide a safety ratchet device of the type specified above, the construction of which is simple and which requires no maintenance, without this adversely effecting reliable operation, and at the same time being fully fail-safe.
  • the ratchet element stands on the support surface and, due to the gravity, automatically "falls” in the slanting position without the necessity of any positively acting member, such as a spring, to achieve this. As furthermore there are no pivots or such which could seize, the device is fully fail-safe during the full lifetime.
  • the location of the centre of gravity ensures at all times that when the urging means are inoperative the ratchet element tilts into the active position.
  • a very favourable embodiment is characterized in claim 2.
  • the electromagnet can be coupled simply to a control device which controls the movement of the movable members. No separate control therefore need take place with the attendant risk of failure to place the ratchet element in the active position.
  • the vehicle lifting device 20 shown in figure 1 is a so-called two-column lifting device and accordingly comprises two columns 21 and 22 in each of which is received a carriage 25 movable vertically up and downward.
  • the carriages 25 bear on their bottom end arms on which a vehicle can be supported.
  • the carriages 25 are driven for vertical movement using hydraulic cylinders 23, 24.
  • the cylinders engage directly between the columns 21, 22 and the carriages 25 and are connected such that synchronous operation is ensured.
  • a safety ratchet device is arranged which is shown in more detail in figure 2.
  • the ratchet device comprises a stop frame 26 which is fixed to the movable carriage 25.
  • a ratchet element 31 is mounted on the stationary column 21.
  • the stop frame 26 comprises in this embodiment a series of protruded stop elements 27 defining a slanting front surface and a stop surface 28. The latter lies transversely of the relative movement of direction of the carriage 25 in relation to the column 21.
  • stop frame 26 with protruded stop elements 27 a stop frame with holes could be used, wherein the upper boundaries of the holes form the stop surfaces.
  • a support element 29 which defines on the top side a support surface 30 facing toward the stop surfaces 28.
  • the ratchet element 31 used in this embodiment rests with its bottom end 39 on the support surface 30.
  • the bottom end 39 is rounded so that it can easily pivot on the support surface 30.
  • the contact area is shifted towards the column, so that the center of gravity of the ratchet element 31 is positioned at the side of the stop surfaces 28 relative to the supporting surface 30.
  • the ratchet element 31 is held in place by means of a locking element 40 which is screwed to the wall of column 21 by means of a bolt 37. Due to the shoulder of the element 40 the ratchet element 31 cannot move away from the support 29.
  • the opening 41 in ratchet element 31 which co-acts with the locking element 40 has considerably larger dimensions than the locking element 40 so that a very loose closure is obtained. In normal operation there is no or hardly any contact between the locking element 40 and the inner wall of hole 41.
  • the ratchet element 31 has an upper end surface 32 which can co-act with the stop surfaces 28. This co-action takes place when the ratchet element 31 is pivoted into the slanting active position shown in figure 2. This slanting active position is the rest position. The ratchet element 31 pivots automatically to the right because its centre of gravity as seen in figure 5 lies to the right of the contact point with the support 29. The safety ratchet device is thus normally active and is moved out of the active position by a specific action. The safety ratchet device is therefore fail-safe.
  • the electromagnet 33 has a plunger 42 which is received for free movement in a channel of the electromagnet 33.
  • electromagnet 33 When electromagnet 33 is energized the plunger 42 is pulled inward, that is, to the left as seen in figure 3.
  • the electromagnet 33 is of the type with a plunger loaded outward, that is, to the right as seen in figure 3, by spring means. This spring loading supports the bias brought about by the force of gravity which will normally hold ratchet element 31 in the slanting active position.
  • the plunger 42 has a head 43 and a portion 44 located thereunder with a smaller diameter.
  • the ratchet element 31 is, as shown more clearly in figure 4, provided with a keyhole-like gripping opening 45 comprising a wide portion 46 and a slot-like portion 47 connecting thereto.
  • the head of the plunger 42 can be pushed through the wide portion 46 of the opening, whereafter the thinner portion 44 of plunger 42 can be pushed into the slot-like portion 47 of the opening.
  • the dimensioning of plunger 42 and opening 45 is again such that a very broad clearance results.
  • the electromagnet 33 can be released and removed very simply and if necessary replaced with a new one when damaged. It will also be apparent that the ratchet device is itself extremely simple in construction and comprises in addition to electromagnet 33 only one moving part, the ratchet element. The mounting of this safety ratchet device is also extremely simple and requires only a few operations.
  • the operation of the shown preferred embodiment of the ratchet device is electrical and can thus be connected in simple manner to the control of the drive of the lifting device.
  • the invention is not limited to the preferred embodiments shown in the figures.
  • the urging means for example can also be mechanical or for instance hydraulic means.
  • the application of the safety ratchet device limited to the use shown with a vehicle lifting device. In all situations where it is desired to enable blocking of two organs movable relative to one another in a longitudinal direction the device according to the invention can be used in the one or other embodiment.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Emergency Lowering Means (AREA)
EP93201038A 1992-04-14 1993-04-07 Safety ratchet device Expired - Lifetime EP0566195B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200688 1992-04-14
NL9200688A NL9200688A (nl) 1992-04-14 1992-04-14 Veiligheidspalinrichting.

Publications (2)

Publication Number Publication Date
EP0566195A1 EP0566195A1 (en) 1993-10-20
EP0566195B1 true EP0566195B1 (en) 1997-07-30

Family

ID=19860696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201038A Expired - Lifetime EP0566195B1 (en) 1992-04-14 1993-04-07 Safety ratchet device

Country Status (5)

Country Link
EP (1) EP0566195B1 (es)
AT (1) ATE156095T1 (es)
DE (1) DE69312552T2 (es)
ES (1) ES2105077T3 (es)
NL (1) NL9200688A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109592618A (zh) * 2018-11-27 2019-04-09 泉州师范学院 双柱汽车举升机倾倒报警装置
US11220415B2 (en) 2018-02-14 2022-01-11 Stertil B.V. Lifting system with lock position sensor for load indication, and method therefor

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803206A (en) * 1996-05-14 1998-09-08 Western Hoist, Inc. Hoist locking and release apparatus
DE29611390U1 (de) * 1996-07-01 1996-08-14 Nussbaum Otto Gmbh Co Kg Hebebühne für Kraftfahrzeuge
US6279685B1 (en) * 1998-05-28 2001-08-28 Hydra-Lift Industries Ltd. Lifting apparatus
DE20015061U1 (de) 2000-08-31 2001-02-22 Maha Gmbh & Co Kg Fahrzeug-Hebebühne
NL1031744C2 (nl) 2006-05-03 2007-11-06 Stertil Bv Hefsysteem.
DE102007020041A1 (de) * 2007-04-27 2008-10-30 Maha Maschinenbau Haldenwang Gmbh & Co. Kg Tragarmarretierung
CN109502504A (zh) * 2017-11-03 2019-03-22 蔚来汽车有限公司 用于换电站的车辆升举装置及其控制方法
CN115367668B (zh) * 2022-10-24 2023-01-31 苏州艾沃意特汽车设备有限公司 一种用于车辆的升降系统

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2143627B3 (es) * 1971-10-06 1974-06-07 Bourette Rene
FR2312450A1 (fr) * 1975-05-30 1976-12-24 Alfio Maccarone Perfectionnements aux ponts elevateurs
AT359694B (de) * 1979-04-13 1980-11-25 Laupper Anton Hydraulische hebevorrichtung
DE3032917A1 (de) * 1980-09-02 1982-04-15 Bremer Stahlbau Gmbh, 2800 Bremen Haltevorrichtung fuer an senkrechten tragelementen auf und ab bewegbare bauteile
US4457401A (en) * 1982-04-09 1984-07-03 Gilbert & Barker Manufacturing Co., Inc. Above-the-floor hydraulic lift
US4892028A (en) * 1984-09-10 1990-01-09 Vbm Corporation Fluid operated circuit for controlling a dual post hydraulic lift assembly
FR2578525B1 (fr) * 1985-03-07 1987-06-26 Reidenbach Roger Dispositif de securite automatique pour un chariot circulant le long de colonnes verticales
US5015146A (en) * 1989-10-13 1991-05-14 Loadmaster Manufacturing, Inc. Vehicle display lift
NL9001901A (nl) * 1990-08-29 1992-03-16 Stertil Bv Draagarmarretering voor een auto-hefbrug.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11220415B2 (en) 2018-02-14 2022-01-11 Stertil B.V. Lifting system with lock position sensor for load indication, and method therefor
CN109592618A (zh) * 2018-11-27 2019-04-09 泉州师范学院 双柱汽车举升机倾倒报警装置

Also Published As

Publication number Publication date
NL9200688A (nl) 1993-11-01
EP0566195A1 (en) 1993-10-20
ATE156095T1 (de) 1997-08-15
ES2105077T3 (es) 1997-10-16
DE69312552T2 (de) 1997-12-04
DE69312552D1 (de) 1997-09-04

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