DE9418720U1 - Vehicle jacks - Google Patents

Description

PATENT ATTORNEYS , reference number:.*

y DiPL-iNG. CONRAD KÖCHLING

DIPL-.NG. CONRAD-JOACHIM KÖCHLING _Note . _Breakdown

Fleyer Straße 135, W-5800 Hagen 1 Real Estate Company

Call{0233i)8ii64 + 85033 Bahnhofstr 41

Fax {02331)84840 DdUIlIlUX S C &Ggr; . ti. Telegrams: Patentköchling Hagen

Accounts: Commerzbank AG, Hagen 3515095 (bank code 45040042) D ~ 3 5 7 5 3 Greifenstein Sparkasse Hagen 100012043(bank code 45050001)
Postgiro: Dortmund 5989 -460 (bank code 440100 46)

58 51
VNR:

Serial No. 11616/94

23 November 1994
from the

CJK/Hi.

Car jack for vehicles.

The invention relates to a car jack for motor vehicles with an arm that can be inserted into a support in the longitudinal side area of a vehicle, which arm is preferably mounted on the stand of the car jack or on a support arm that can be swiveled out on the stand by means of a spindle actuation so that it can pivot to a limited extent about a first horizontal axis that is aligned parallel to the longitudinal axis of the vehicle in the assembly position.

In the state of the art, car jacks are known in which the arm, which can be inserted into a support in the side longitudinal area of a car, can only be adjusted vertically to the stand by means of a threaded spindle. So-called articulated car jacks are also known in which a pivoting support arm is provided which is pivotably connected to the stand and can be adjusted by means of a

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The threaded spindle mounted on the stand can be pivoted from a pivoted rest position into a pivoted out position of use. The boom, which can be inserted into the longitudinal side area of the motor vehicle, is arranged at the free end of the support arm.

The invention relates primarily, although not exclusively, to the second type of jack.

The chassis designs of today's motor vehicles, especially cars, station wagons and the like, are very different. The wheels are often suspended on swing arms that, when sprung, describe a circular path around the suspension point. For example, the rear wheel is suspended on a swing arm that is supported by springs and that rotates around the suspension. When attaching a car jack, the boom is first inserted into a corresponding slot in the body or chassis frame of the vehicle. The rear wheels of the

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Vehicles are secured by the handbrake. The corresponding rear wheel is thus practically immovably connected to the road at the contact surface by friction. When the jack is raised, the support point of the boom on the body or chassis moves towards the rear wheel, causing the support (area of the inserted support) to travel a corresponding distance in the longitudinal direction of the vehicle. The vehicle is pulled backwards by this distance by the braked rear wheel. The unbraked front wheel therefore rolls back the same distance.

The jack, which is secured with the boom in the corresponding holder of the vehicle or the vehicle body, also follows this movement and is therefore in an inclined position at the top dead center of the jack. This causes tension on the jack and also on the corresponding vehicle holder, which can lead to damage to both parts.

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A correspondingly stable design of both parts is required.

In conventional car jacks, it is already known to mount the boom so that it can pivot around an axis parallel to the vehicle’s longitudinal axis in order to be able to compensate for the erection movement of the car jack, in particular the articulated car jack, when moving from the attached position to the raised position.

Based on this state of the art, the invention is based on the object of creating a car jack of this type in which movements in the forward or backward direction of the vehicle caused by the displacement of the vehicle during lifting can be compensated for without causing damage, without causing damage to the body-side mount of the boom or to the boom or car jack itself.

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To solve this problem, it is proposed that the boom be mounted so that it can pivot to a limited extent about a second horizontal axis which is orthogonal to the first horizontal axis and is directed transversely to the vehicle's longitudinal axis.

This creates a jack in which the boom can not only pivot around an axis parallel to the vehicle's longitudinal axis, but can also move transversely to it in a horizontal plane transverse to the vehicle's longitudinal direction, thereby avoiding or largely preventing any tension that may occur between the boom and the insertion area of the body at the top dead center of the jack. An elastic pivoting movement is preferred, which means that the starting position is automatically adjusted when the load is removed.

A possibly preferred further development is seen in the fact that both horizontal axes cross each other.

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This results in a very compact design, as the crossing arrangement of the horizontal axes allows the pivoting arrangement of the boom to be made very compact.

In a further development of this, it is proposed that the first horizontal axis is formed by a bolt that passes through the stand or support arm and holds the boom, and the second horizontal axis is formed by a rubber-elastic bearing that is arranged in the throughput area of the bolt between the bolt and the stand or support arm.

This design can be implemented, for example, by inserting a rubber-metal bushing into the reach-through area of the stand or the support arm of the car jack, which is then centrally penetrated by a hinge pin that is connected to the boom. This enables the swivel movement around the hinge pin, i.e.

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around an axis parallel to the vehicle's longitudinal axis, whereby the boom can also pivot transversely to it thanks to the rubber-metal bearing.

A variant of this is that the first horizontal axis is formed by a bolt that passes through the stand or support arm and holds the boom, and the second horizontal axis is formed by a rubber-elastic bearing that is operatively connected to the stand or support arm and boom, so that the boom can be pivoted about the bolt transversely to the bolt's longitudinal axis.

In such an embodiment, for example, the boom can be held on a bolt so that it can pivot around the bolt axis and also pivot transversely thereto by means of corresponding spherical contact surfaces, whereby the bolt is held, for example, by the legs of a U-shaped stand or support arm and a corresponding web of the boom is placed between these legs.

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engages. Between the web and the legs, appropriate elastic bearings in the form of rubber buffers or the like can be arranged so that the swivel movement is possible transversely to the bolt's longitudinal axis'' and cushioned by the elastic elements.

A further variant is seen in that the boom consists of a first element which can be pivoted about the bolt longitudinal axis as the first horizontal axis, and a second element which is pivotably held on the first element and an axis which is directed transversely to the bolt longitudinal axis and forms the second horizontal axis.

In this design, the first element of the boom is held in a conventional manner on the bolt forming the first horizontal axis, while the second element of the boom is pivotally held on this element, for example with the interposition of a rubber-elastic bearing.

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Although the arrangement of both the first and the second horizontal pivot axis is preferred, the invention also encompasses a design that only includes the second pivoting option and dispenses with the first pivoting option.

The invention further relates to a car jack according to the preamble of claim 1, wherein the support arm consists of a U-profile or similar profile part, between the legs of which the spindle of the spindle actuation engages, which passes through the spindle nut held between the legs and rotatably mounted on the legs.

In conventional car jacks of this type, the distance between the legs of the U-profile or other profile part is relatively large, so that the spindle does not come into contact with the legs of the profile even under load. In these known designs, the spindle nut, which is held between the legs and rotatably mounted on the legs, is made of metal or supported by metal support shells, since these

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The spindle nut must be able to absorb any bending forces that may occur without becoming damaged.

Based on this state of the art, the invention is based on the object of creating a car jack that does not require spindle nuts, which must be able to absorb considerable bending moments.

To solve this problem, it is proposed that the gap formed between the legs of the support arm is equal to or slightly larger than the spindle diameter.

It is particularly preferred that the spindle nut is made of a material with low bending strength, in particular plastic.

Because the distance between the legs of the support arm or the like is only as wide as the threaded spindle diameter, the

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When bending forces occur, the threaded spindle can be supported on the legs without the spindle nut having to absorb significant bending moments. The spindle nut can therefore be made from inexpensive material, in particular from material with low bending strength, preferably plastic, without this affecting the service life of the jack.

The invention is explained below using embodiments.
It shows:

Fig. 1 A jack according to the invention in view;

Fig. 2 the jack seen in section II-II of Figure 1 ;

Fig. 3 shows the jack in section III-III of Figure 1;

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Fig. 4 to 6 show a first embodiment in different load conditions in the view according to Figure 3;

Fig. 7 to 9 show a variant in the view according to Figures 4 to 6;

Fig. 10 to 12 and Fig. 13 to 15 further variants

in the same view;

Fig. 16 a schematic diagram of the movement sequence of the jack and vehicle.

Figure 1 shows a car jack, in particular an articulated car jack 1 for motor vehicles. This car jack 1 has a boom 2 that can be inserted into a support in the longitudinal side area of a motor vehicle, optionally with a semi-circular adapter head 3, which is arranged around a first

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horizontal axis is pivotably supported to a support arm 4 of the jack. The first horizontal axis is formed by a hinge pin 5. The support arm 4 is hinged at 6 to the stand 7 of the jack 1 and can be pivoted from a pivoted-in position to a pivoted-out position by means of a threaded spindle 8, which is shown in the drawing, whereby the threaded spindle engages in a spindle nut 9 held on the support arm 4 and is rotatably mounted in a spindle bearing at 10. A hand crank 11 is attached to the end of the threaded spindle 8 adjacent to the spindle bearing 10. As can be seen in particular from Figure 2, the support arm 4 consists of a U-shaped profile part, between the legs of which the spindle 8 runs and the spindle nut 9 is arranged and rotatably mounted on the legs.

The movement sequence that occurs when a vehicle is lifted is illustrated in Figure 16. In modern motor vehicles, the rear wheel A is often suspended from a swing arm C. The swing arm C

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is supported by springs and rotates about a suspension D. When a jack is placed at point El, the rear wheels are locked by the handbrake in the example shown here. The rear wheel A is thus practically immovably connected to the road at the contact surface F by friction.

When the jack is raised, the starting point El moves to E2. The resulting circular arc of the bearing D leads to a projected distance a. The vehicle is pulled backwards by this distance a by the braked rear wheel A. The unbraked front wheel B therefore rolls back by the same distance a.

The jack, which is locked in the jack holder on the vehicle, also follows the movement a and is therefore in an inclined position at the top dead center. This causes tension on the jack as well as on the vehicle holder, which can lead to damage to both parts and requires a stable design of both parts.

♦ · · t

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The invention aims to remedy this and proposes a boom 2 that not only pivots about an axis parallel to the vehicle's long side, formed by the bolt 5, but can also swing transversely to the attached jack 1 under load through primarily elastic bearings, for example through a rubber-metal connection. The pivoting mobility and the elastic bearing can be created by plastic or hard rubber spacers or rubber-metal connections, whereby the tensions that occur at the top dead center are reduced or eliminated and whereby it is also ensured that the starting position is automatically restored when the load is removed.

The boom 2 is therefore supported so that it can pivot to a limited extent about a second horizontal axis 12 which is orthogonal to the first horizontal axis 11 and which, according to drawing figures 3 to 15, passes through the drawing plane from front to back.

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In the embodiments according to Figure 3 to Figure 9, the arrangement is such that the horizontal axes 11 and 12 cross each other. The first horizontal axis is formed continuously by a bolt 5 that passes through the support arm 4. In the embodiment according to Figures 4 to 6, the bolt 5 is connected to angled edge parts of the boom 2. A rubber-metal bearing 13 is arranged concentrically around the bolt, which is arranged in the throughput area of the bolt 5 between the bolt 5 and the legs of the support arm 4. The legs of the support arm 4 have correspondingly large holes so that the rubber-metal bearing 13 can be inserted there and, if necessary, also fixed. In this embodiment according to Figures 4 to 6, starting from the non-load state according to Figure 4, different load states can be established, as shown in Figures 5 and 6, so that the boom 2 can not only pivot about the axis 11, but can also pivot elastically about the axis 12.

* -* • • • • · »* • • * ♦ ·*· • ♦ · · • • • t··· • * • • • • » • tit ft

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In the embodiment according to Figures 7 to 9, the first horizontal axis is again formed by the bolt 5, which passes through the legs of the support arm and is fixed to the support arm 4. The boom 2 is held on the shaft of the bolt so that it can rotate around the axis 11, whereby the boom 2 can also rotate around the axis 12. The corresponding contact surfaces of a web 14 protruding from the underside of the boom are spherical, so that movement according to Figures 8 and 9 is possible without hindrance. Rubber-elastic bearings 15 are arranged between the legs of the support arm 4 and the web of the boom 2, so that the movement from the starting position according to Figure 7 into the loaded position according to Figures 8 and 9 is possible by deforming the elastic bearings 15 and a restoring moment is formed so that the boom 2 automatically returns to the starting position according to Figure 7 in the unloaded state.

In the embodiments according to Figure 10 to Figure 15 the two horizontal axes 11 and 12 are spaced

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from each other. The boom 2 consists of a first element 16, which can be pivoted about the longitudinal axis of the bolt 5, and a second element 17, which is held on the first element 16 so that it can pivot about an axis that is directed transversely to the bolt longitudinal axis 11 and forms the second horizontal axis 12. The first element

16 is held on the second element 17 of the boom 2 by a rubber-elastic bearing 8.

While in the embodiment according to Figures 10 and 11 one element 16 is formed by a U-shaped part, while part 17 is formed by a C-profile-like part which is coupled to part 16 in this way and the parts are fixed by the rubber-elastic bearing 18, in the embodiment according to Figures 13 to 15 the second element

17 is similarly designed, but element 16 is provided with a spherical front surface. As a consequence, with different loads, a situation can arise in the embodiment according to Figures 10 to 12

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, which are shown in Figures 11 and 12, whereby the parallel surfaces of the web of the C-profile under the front surface of the U-profile allow a corresponding mobility of the element 17. In the embodiment according to Figures 13 to 15, this mobility is further improved by the spherical surface of the part 16. Therefore, only the use of rubber-elastic bearings 18 of smaller thickness dimensions is required.

Another advantage of the invention is explained using the embodiments according to Figures 1 and 2. In this embodiment, the support arm 4 is designed as a U-profile, as can be seen in particular from Figure 2. The dimension of the leg spacing of the support arm 4 with regard to the spindle diameter of the spindle 8 is such that the spindle practically rests on the inside of both legs, as can be seen from Figure 2. This design makes it possible to make the spindle nut 9 from a material with little bending strength,

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for example, to be made and used from plastic, since the bending moments acting on the spindle 8 can be absorbed by the legs of the support arm 4. The spindle nut 9 therefore does not require support from metal parts or even a metal construction itself. In previously common designs, it was always necessary to support a spindle nut with additional metal parts or to construct the spindle nut itself from metal.

The invention is not limited to the embodiments, but is variable in many ways.

All new individual and combination features disclosed in the description and/or drawing are considered essential to the invention.

Claims (7)

• · Breakdown 11616/94 -21- Protection claims: 1. Car jack for motor vehicles with a boom that can be inserted into a support with a side longitudinal area of a vehicle, which is preferably held on the stand of the car jack so that it can pivot to a limited extent about a first horizontal axis that is parallel to the vehicle's longitudinal axis in the assembly position, or on a support arm that can be pivoted out on the stand by means of a spindle actuation, characterized in that the boom (2) is held so that it can pivot to a limited extent about a second horizontal axis (12) that is orthogonal to the first horizontal axis (11) and is directed transversely to the vehicle's longitudinal axis. 2. Car jack according to claim 1, characterized in that both horizontal axes (11, 12) cross each other. Breakdown 11616/94 -22- 3. Car jack according to claim 1 or 2, characterized in that the first horizontal axis (11) is formed by a bolt (5) which passes through the stand or support arm (4) and holds the boom (2), and the second horizontal axis (12) is formed by a rubber-elastic bearing (13) which is arranged in the throughput area of the bolt (5) between the bolt (5) and the stand or support arm (4). 4. Car jack according to claim 1 or 2, characterized in that the first horizontal axis (11) is formed by a bolt (5) which passes through the stand or support arm (4) and holds the boom (2), and the second horizontal axis (12) is formed by a rubber-elastic bearing (15) which is operatively connected to the stand or support arm (4) and boom (2), the boom (2) can pivot about the bolt (5) transversely to the bolt longitudinal axis. Breakdown 11616/94 -23- 5. Jack according to claim 1, characterized in that the boom (2) consists of a first element (16) which is pivotable about the longitudinal axis of the bolt as the first horizontal axis (11), and a second element (17) which is held pivotably on the first element (16) about an axis which is directed transversely to the longitudinal axis of the bolt and forms the second horizontal axis (12). 6. Jack according to claim 5, characterized in that the first element (16) is held on the second element (17) of the boom (2) by a rubber-elastic bearing (18). 7. Car jack according to the preamble of claim 1, wherein the support arm consists of a U-profile or similar profile part, between the legs of which the spindle of the spindle actuation engages, which passes through the spindle nut held between the legs and rotatably mounted on the legs, thereby Breakdown 11616/94 -24- characterized in that the gap formed between the legs of the support arm (4) is equal to or slightly larger than the spindle diameter. Car jack according to claim 7, characterized in that the spindle nut (9) consists of a material with little bending strength, in particular of plastic.