EP0320613B1 - Wagenheber - Google Patents

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Publication number
EP0320613B1
EP0320613B1 EP88118491A EP88118491A EP0320613B1 EP 0320613 B1 EP0320613 B1 EP 0320613B1 EP 88118491 A EP88118491 A EP 88118491A EP 88118491 A EP88118491 A EP 88118491A EP 0320613 B1 EP0320613 B1 EP 0320613B1
Authority
EP
European Patent Office
Prior art keywords
spindle nut
vehicle jack
axle journals
jack according
metal
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
EP88118491A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0320613A1 (de
Inventor
Willi Erschens
Ferdinand Alten
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.)
ThyssenKrupp Bilstein GmbH
Original Assignee
August Bilstein GmbH
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 August Bilstein GmbH filed Critical August Bilstein GmbH
Publication of EP0320613A1 publication Critical patent/EP0320613A1/de
Application granted granted Critical
Publication of EP0320613B1 publication Critical patent/EP0320613B1/de
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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers

Definitions

  • the invention relates to a jack with a support leg on which a support arm pivoted about a horizontal axis is articulated, on which a threaded spindle engages, which is articulated on the support leg with a spindle nut made of plastic, which has axle journals in bearing recesses of the sheet metal part trained stand intervenes.
  • the spindle nut of such jacks is often made of plastic, because in connection with the threaded spindle made of steel for strength reasons, there is a favorable friction pairing. Therefore, the plastic spindle nut is preferably used where the hand forces to move the spindle when lifting the trolley are to be kept small or a substantial load has to be lifted.
  • a disadvantage of the known jacks is that the axle journals only have a small contact area in the mainstay because the bearing recesses of this sheet metal part are punched and, due to the low material thickness of the sheet metal, they have only correspondingly small dimensions. This results in a very high surface pressure, which can lead to the fact that the axle journals are overstressed.
  • the axle journals rotate in the bearing recesses or on their narrow surfaces during the lifting of the motor vehicle, so that damage to the axle journals when the vehicle is raised several times or when lifting higher loads cannot be ruled out. With increasing wear, the changing radii result in an increase in the load on the axle journals, which contributes to their rapid wear. This can result in the destruction of the trunnion and the jack becoming unusable.
  • the invention is therefore based on the object of improving a jack of the type mentioned in such a way that the durability of the spindle nut is increased significantly and certainly.
  • the ends of the spindle of the spindle nut no longer rest directly on the narrow webs of the supporting leg, but are supported on support segments. These perform the relative movements to the mainstay required when the motor vehicle is lifted, so that the axle journals made of plastic are no longer subjected to sliding movements.
  • the support segments offer the spindle of the spindle nut a sufficiently large contact surface, so that the surface pressure is reduced according to the material.
  • the design of the support segments is largely independent of the design of the axle journals and can therefore be optimally designed in terms of construction. Tolerances of the metal bracket, the bearing recesses of the The pillar and the journal can move in the usual sizes without there being any fundamental difficulties in adaptation.
  • the metal bracket is a one-piece part, which has the support segments for both journals. So although measures must be taken on two journals, only a single part is necessary to achieve this goal.
  • the form-fitting assembly of the metal bracket with the plastic spindle nut also does not result in any problems, this form-locking being variable within wide limits, provided that it only ensures that the relative position between the metal bracket and the spindle nut is retained.
  • the metal bracket can absorb bending forces with appropriate dimensioning and thus contributes to relieving the load on the spindle nut, which increases its durability, in particular also in the area of the thread of the spindle nut.
  • the metal bracket is a sheet metal tab with a recess with which the bracket is arranged on a stepped projection of the spindle nut surrounding the threaded spindle.
  • This configuration results in a captive arrangement of the metal bracket on the threaded spindle or on the spindle nut, whereby the offset projection can contribute because it has an internal thread that the forces to be transmitted from the threaded spindle are removed from the spindle nut with a comparatively low load on the nut thread will.
  • the formation of the offset projection is easy because the threaded nut is an injection molded part, in which this projection can be easily molded in the desired configuration.
  • the metal bracket is arranged on the support arm side of the spindle nut and has angled projections against its axle journal, on which the support segments are located.
  • the metal bracket is in a simple manner practically U-shaped with radially outwardly projecting support segments which engage between the axle journals and the narrow webs of the supporting leg.
  • the metal bracket is arranged essentially between the U legs of a U-shaped support leg. This has the advantage that the metal bracket is covered by the pillar and does not interfere outside, for example when operating the jack.
  • the support segments are longer than flaps parallel to the axles, and the axles have outer circumferential recesses that receive the support segments.
  • the flaps can be dimensioned as long as the load capacity of the material of the axle journals requires and the outer circumferential recesses of the axle journals ensure that the supporting leg does not have to be modified in the area of its bearing recesses, so that there are no strength-influencing circumstances in this area of the supporting leg result in a constructive modification of the mainstay in this area.
  • the axle journals have radially projecting locking ribs at their ends located outside the outer circumferential recesses. These locking ribs engage behind the side walls of the pillar.
  • the metal bracket performs a corresponding function if it has holding lobes parallel to the bends of the metal bracket on its support segments facing the support arm.
  • the narrow webs of the supporting leg are encompassed in the area of the bearing recesses, thereby additionally securing the position of the metal bracket on the supporting leg, so that larger tolerances can also occur without the effect of the metal bracket or the mounting of the journal or the plastic spindle nut be affected.
  • the metal bracket is therefore advantageously a stamped part.
  • the jack 1 consists essentially of a pillar 2 of any design, but in the present case with a U-shaped cross section, so that mutually parallel U-legs 2 'are present, which support a horizontal axis 3 to which a support arm 4 is pivotally attached .
  • the lower end of the support leg 2 is provided with a firmly attached foot 17, so that the jack has a positioning surface 18 which ensures that the jack 1 is positioned in the position shown in FIG.
  • the foot 17 rolls around the rolling edge 19 so that it comes to rest on the standing surface 20 when the motor vehicle is fully raised.
  • the support arm 4 which has at its free end 24 a movable support plate 21 with a recess 22 into which, for example, a sill seam of the motor vehicle engages, as a result of which the support arm is immovable on the floor of the motor vehicle.
  • the movable fastening of the support plate 21 with the axle 23 at the free end 24 of the support arm 4 ensures that no rolling movements occur on the floor of the motor vehicle.
  • a threaded spindle 5 is actuated to lift the motor vehicle, which engages on the one hand with a spindle abutment (not shown) on the support arm 4, as is known, for example, from DE-AS-2427443.
  • the threaded spindle 5 is screwed into a spindle nut 6, which with axle journals 7 in bearing recesses 8 of the upper end 2 ⁇ of the supporting leg 2 intervention.
  • the threaded spindle 5 is articulated with a hand crank 25 via a joint piece 26 so that it can be rotated, which results in a longitudinal adjustment in the spindle nut 6 and, as a result, a lifting or lowering of the support arm 4 and thus of the motor vehicle depending on the direction of rotation.
  • the assembly of the spindle nut 6 with the upper end 2 ⁇ of the support leg 2 is carried out in such a way that the bottom 2 ′′′ of the U-shaped support leg 2 is excluded in the area of the spindle nut and in the U-legs 2 'longitudinal slots are provided as bearing recesses 8, about as described in DE-A-2438643.
  • the special installation position and the tensile load on the spindle nut 6 caused by the threaded spindle 5 when the jack 1 is loaded by a motor vehicle mean that the spindle nut 6 cannot slip out of the bearing recesses 8.
  • the spindle nut 6 shown in more detail in FIG. 2 consists of plastic and essentially has a body 27 surrounding the threaded spindle 5, which is designed as a hollow body and has a thread 28 on the inside which corresponds to the thread of the threaded spindle 5, not shown.
  • the axle pins 7 of the spindle nut 6 are provided with a comparatively large diameter D in order to be able to transmit the forces originating from the threaded spindle 5 to the supporting leg 2.
  • the end of the spindle nut 6 on the support arm side is stepped down, so that a projection 13 with a smaller diameter results.
  • a metal bracket 9 is shown in Fig. 2, which is essentially a sheet metal tab with a recess 12 which is matched to the outer diameter of the projection 13 so that the bracket 9 can be pushed onto the projection 13. In this position, the metal bracket 9 is arranged after the assembly of the spindle nut 6 with the support leg 2 between the U-legs 2 'in the region of the upper end leg 2..
  • the bracket 9 has two bends 34 projecting in the direction of the axle pins 7, so that the bracket is U-shaped.
  • the ends of the bends 34 carry radially projecting support segments 11 which are at least thick in the supporting leg plate, but preferably somewhat longer.
  • These support segments 11 are axially parallel lobes which are bent in accordance with the outer circumference of the axles 7. They form support surfaces 29 which bear against the journal 7.
  • they form support surfaces 30 which are supported on those narrow webs of the supporting leg 2 which form the bearing recesses 8.
  • the journal 7 with its journal surfaces 31 are supported indirectly on the supporting leg 2 via the support segments 11 and by reducing the surface pressure.
  • the axle journals are provided with outer peripheral recesses 14 which are arranged concentrically with the non-reduced outer peripheral surfaces 32 of the axle journals 7. Their extension in the axial direction is comparatively large, preferably over the entire length of the journal 7 and the depth of these outer peripheral recesses 14 corresponds approximately to the sheet thickness of the bracket 9.
  • Retaining tabs 15 are attached to the support segments 11, which are parallel to the bends 34 of the metal bracket 9 and extend away from the spindle nut 6 in the direction of the support arm. With these retaining tabs, the bracket 9 engages around the edges of the supporting leg 2 forming the bearing recesses 8. In addition, as far as they extend correspondingly to the outer circumference of the journal 7 or their outer circumferential surfaces 32, they are engaged by locking ribs 16 which extend outside the area of the outer circumferential recesses 14 the ends of the journal 7 are attached.
  • the spindle nut 6 also has spacing edges 33 which, together with the locking ribs 16, form the groove shown in FIG. 2, the bottom of which is the outer peripheral surface 32.
  • the groove formed in this way or the spacing edge 33 of the spindle nut are arranged so that the distance between the U-legs 2 'of the supporting leg 2 is filled. Only in the area of the outer circumferential recesses 14 are the spacing edges 33 offset from the threaded spindle in order to make room for the engagement of the bends 34 of the bracket 9.
  • the outer diameter of the body 27 of the spindle nut 6 does not need to be reduced, because the distance between the U-legs 2 'for stability reasons of the supporting leg 2 must be larger than the outer diameter of the body 27, so that the arrangement of the bracket 9th no waiver of the spindle nut strength.
EP88118491A 1987-12-17 1988-11-05 Wagenheber Expired - Lifetime EP0320613B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8716609U DE8716609U1 (ja) 1987-12-17 1987-12-17
DE8716609U 1987-12-17

Publications (2)

Publication Number Publication Date
EP0320613A1 EP0320613A1 (de) 1989-06-21
EP0320613B1 true EP0320613B1 (de) 1991-10-16

Family

ID=6815193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118491A Expired - Lifetime EP0320613B1 (de) 1987-12-17 1988-11-05 Wagenheber

Country Status (3)

Country Link
EP (1) EP0320613B1 (ja)
DE (2) DE8716609U1 (ja)
ES (1) ES2026626T3 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053860B4 (de) * 2000-10-31 2010-10-28 Brano Wagenheber Gmbh Bewegungsmutter für eine Hubvorrichtung sowie Hubvorrichtung

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815247A1 (de) * 1988-05-05 1989-11-16 Storz E A Kg Wagenheber
EP0340551B1 (de) * 1988-05-05 1992-03-04 E.A. Storz Gmbh & Co. Kg Wagenheber
DE4114129C2 (de) * 1991-04-30 1993-11-11 Bilstein August Gmbh Co Kg Wagenheber
ES2129311B1 (es) * 1996-01-22 2000-05-01 Batz S Coop Ltada Gato para vehiculos.
GB2330349B (en) * 1997-10-14 2001-04-25 Metallifacture Ltd Vehicle jack
ES2139527B1 (es) * 1997-12-04 2000-10-16 Batz S Coop Ltda "gato"
GB9901468D0 (en) * 1999-01-23 1999-03-17 Metallifacture Ltd Vehicle jack
ES2158799B1 (es) 1999-08-30 2002-04-01 Batz S Coop Ltda Gato para vehiculos.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2175532B1 (ja) * 1972-03-13 1976-10-29 Rousseau Jean Jacques
AT358769B (de) * 1974-06-07 1980-09-25 Bilstein August Fa Wagenheber
DE2914118A1 (de) * 1979-04-07 1980-10-23 Storz E A Kg Lageranordnung fuer wagenheber
YU16181A (en) * 1980-02-26 1983-12-31 Bilstein August Automobile lifting device
DE3510196C2 (de) * 1985-03-21 1995-11-23 Storz E A Kg Wagenheber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053860B4 (de) * 2000-10-31 2010-10-28 Brano Wagenheber Gmbh Bewegungsmutter für eine Hubvorrichtung sowie Hubvorrichtung

Also Published As

Publication number Publication date
DE8716609U1 (ja) 1988-02-18
EP0320613A1 (de) 1989-06-21
ES2026626T3 (es) 1992-05-01
DE3865648D1 (de) 1991-11-21

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