DE10244036A1 - Lift device for boot lids of vehicles has tensile spring assisting opening but which can be shortened by blocking element to prevent opening of not completely closed lid - Google Patents

Abstract

A lifting device for the trunk lid (4) of passenger cars has a tension spring (9) which supports an opening movement of the lid (4) and which is connected on the one hand to the lid (4) and on the other hand to the body (1). A length-adjustable blocking element (14) is assigned to the tension spring (9), by means of which a minimum length of the tension spring (9) can be adjusted.

Description

The invention relates to a lifting device for trunk lid according to the preamble of claim 1.

Such lifting devices are in widely used in practice. This usually applies as a pre-tensioned Helical tension spring trained tension spring on the one hand on the body and on the other hand on a hinge between the lid and the body that is designed such that the tension spring as it were a lever of the cover engages so that the pulling force in the opening direction the lid works.

If due to too large objects in the Trunk the lid can not be closed completely, then it is due the tension of the tension spring during the ride completely open what not desirable is.

The invention is therefore the object to design a lifting device of the generic type that an opening not completely closed lid is excluded.

This object is achieved by the Features solved in the characterizing part of claim 1. The The essence of the invention is therefore that the trunk lid in any intermediate position can be blocked against further opening. If the trunk lid is not completely closed due to objects that are too large in the trunk then it is closed as much as possible and then locked by blocking the blocking element. Furthermore can the user use the blocking element to change the opening angle or opening path limit the lid upwards. This is especially for small ones Advantages for users and low garages.

The advantageous training after Claim 2 enables the use of lockable gas springs, as they are in principle commercially available. Under lockable gas springs are understood to be those with a compressed gas filling, the still very small spring travel with very steep even in the blocked state Allow path-force characteristic. On the other hand, this also includes hydraulically lockable gas springs understood that neglect the compressibility of oil are rigidly blockable and their gas filling in the unblocked state essentially only serves to push out the piston rod. About that In addition, the gas spring can be damped hydraulically and / or pneumatically.

Claims 3 and 4 give an advantageous operation possibility with a special design of the blocking element again, the control element at any point on the motor vehicle, for example in the area of the driver's seat. The latter also applies to the various design options according to the claims 5 to 7.

Claims 8 and 9 give a particular compact design again. By further design according to claim 10 wear and tear on the one hand on the other hand, noises prevented.

In the particularly advantageous embodiment according to claim 11 with the advantageous development according to claim 12 is achieved that the blocked in an intermediate position The lid can still be closed, but opening is impossible.

In contrast, the design achieved according to claim 13 that the lid in the blocked intermediate position neither opened nor can be closed.

Other features, advantages and details of the Invention emerge from the following description of exemplary embodiments based on the drawing.

It shows

1 the rear area of a passenger car with trunk and trunk lid and a lifting device according to the invention arranged in the trunk,

2 a portion of the trunk with the trunk lid partially open,

3 a representation accordingly 2 with closed trunk lid,

4 a tension spring with extended blocking element,

5 a tension spring with a locked blocking element,

6 an operating element for the blocking element in a position for unblocking the blocking element,

7 the operating element in a position for blocking the blocking element and

8th a tension spring with a modified version of a blocking element.

This in 1 Motor vehicle shown is a passenger car, the body 1 among other things via rear wheels 2 is supported against the ground. At the rear end of the body 1 there is a trunk 3 by means of a trunk lid 4 is lockable. The lid 4 is by means of a so-called hinge 5 on the body 1 articulated. The hinge 5 has a U-shaped bracket that is still open at the top 6 on, one of which, the passenger compartment 7 adjacent free end by means of a joint 8th on the body 1 is articulated. The other free end of the bracket 6 that the rear end of the trunk 3 is facing is on the lid 4 attached.

In the lower part of the temple 6 is a preloaded coil tension spring as a lifting device 9 by means of a retaining bolt 10 attached. The other, the rear end of the body 1 facing end of the tension spring 9 is by means of another retaining bolt 11 on the body 1 , namely the side wall 12 of the trunk 3 appropriate. Because the linkage of the tension spring 9 over the retaining bolt 10 on the bracket 6 below the joint 8th and below the lid 4 is the pre-tensioned coil tension spring 4 a pulling force in the opening direction 13 on the lid 4 off because when you open the lid 4 through the retaining bolt 10 Hinge point formed towards the by the retaining bolt 11 formed articulation point is moved. So much for the mainspring 9 and the articulation of which has been described so far, this is known and is common in motor vehicles. The tension spring 9 So practice one in the opening direction 13 force acting on the lid 4 off, thus supports the opening movement by the user.

In the mainspring 9 is a locking element adjustable in length 14 arranged. In the illustrated embodiment according to the 1 to 7 there is this blocking element 14 from a hydraulically or pneumatically lockable gas spring, which is a cylindrical housing 15 and one in this in the direction of the retaining bolts 10 . 11 connecting central longitudinal axis 16 slidably guided piston rod 17 having. The housing 15 points to the outlet of the piston rod 17 opposite end a stop 18 on. The free end of the piston rod 17 is in a holding piece 19 fixed that by means of the retaining bolt 10 on the side wall 12 is set and in turn the tension spring 9 is attached. A blocking or unblocking of the blocking element 14 takes place through a piston rod in the form of a tube 17 slidably guided actuating plunger 20 , This can be done using an operating lever 21 into the piston rod 17 and thus towards the housing 15 be moved. Such length-adjustable, lockable gas springs are generally known and are used hundreds of millions of times in practice, particularly in office chairs for height adjustment and for adjusting the backrests. Please refer to EP 0 353 550 B1 (corresponding US 4,949,941 , corresponding JP 2-80 825 A ).

The gas pressure in the gas spring is chosen so low in the present case that when unblocking by pushing in the plunger 20 into the piston rod 17 the piston rod 17 out of the housing 15 the blocking element is pushed out 14 So it is extended, causing the piston rod to be reinserted 17 in the housing 15 , so to shorten the blocking element 14 , required forces are as low as possible. The gas spring does not necessarily have to lock hydraulically rigidly, but can also have a pneumatic locking, which still allow tiny spring movements in the locked state. In addition, the gas spring is usually provided with damping so that the extension speeds are low.

The actuation of the pivoted actuation lever 21 takes place via a Bowden train 22 whose wire 23 at the outer free end of the operating lever 21 is attached and its hose 24 at the stop 19 is set. The Bowden train 22 is by means of an operating element 25 , for example in the passenger compartment 7 can be arranged. A base plate 26 of the control element 25 is on the hose 24 attached. The wire 23 is on an operating lever 27 attached to a journal 28 swiveling on the base plate 26 is stored. The operating lever 27 can from one in 7 position shown in a 6 position shown are pivoted, the wire 23 out of the hose 24 is pulled out, so that the actuating lever 21 to the piston rod 17 is pivoted, which in turn causes the actuating plunger 20 into the piston rod 17 is pushed in. As a result, the gas spring is unblocked and moves apart, unless a corresponding force is exerted, through the piston rod 17 into the housing 15 is inserted. As the 6 and 7 the lever 27 when swiveling from the blocking position according to 7 in the unlock position according to 6 and pivoted in the opposite direction over a pressure point so that it has a stable position in both positions. The lever can also be constantly in the unblocking position 6 remain.

If the lid 4 is completely open, that is to say in an approximately vertical position (not shown in the drawing), then the tension spring has 9 their smallest length because the retaining bolt 10 closest to the retaining bolt 11 located. So that this complete opening of the lid 4 is possible, the blocking element formed by the gas spring must first or during the opening movement 14 be unblocked, ie the operating lever 27 must be in the open position according to 6 are located. The attack 18 then lies on the retaining bolt during this opening movement 10 on like out 4 can be seen. The blocking element 14 is pushed together. If in this open position the control lever 27 according to the closed position 7 is brought and the lid according to the partially open intermediate position 2 according to the closed position 3 against the opening direction 13 is pivoted, then the blocking element remains 14 in its retracted position; the attack 18 lifts off the retaining bolt 10 depending on how the 1 . 3 and 5 results.

If, however, the lid 4 in a partially open intermediate position, for example accordingly 2 is to be blocked, then again the operating lever 27 of the control element 25 in the open position according to 6 brought or he remains in this open position, which he when opening the lid 4 has already taken up the lid 4 is brought into the desired partially open intermediate position. The blocking element 14 moves so far apart that his stop 18 against the retaining bolt 10 is applied. The operating lever is in the desired intermediate position 27 according to the closed position 7 brought. The blocking element 14 will then be in this position in the stop 18 against the retaining bolt 10 is present, blocked. Opening the lid 4 from this intermediate position in the opening direction 13 is then no longer possible. However, a further closing is possible. In this embodiment, the blocking element 14 in its retracted position according to 1 and 5 remain and be blocked when the lid 4 is only moved between its fully closed and fully open position, so if no blocking in an intermediate position is required.

So that the housing 15 in the tension spring 9 Noise and wear-free are two sliding sleeves 29 . 30 made of plastic. The one sliding sleeve 29 is on the retaining bolt 10 facing end of the tension spring 9 immovable in the tension spring 9 arranged, namely by a tension spring 9 encompassing waistband 31 , The other sliding sleeve 30 is on the case 15 fixed, in the area of the outlet of the piston rod 17 , The total length of both sliding sleeves 29 . 30 is such that when the stop is made 18 on the retaining bolt 10 the two sliding sleeves 29 . 30 just don't lie against each other. When moving the blocking element apart 14 they are separated from each other accordingly, as from 5 evident.

In the embodiment according to 8th is the blocking element 14 ' with its exit from the piston rod 17 opposite end by means of a fastening element 32 on the retaining bolt 10 attached so that the blocking element 14 ' constantly with the bracket 6 of the hinge 5 connected is. Incidentally, the structure and arrangement of the blocking element 14 ' identical to that of the blocking element 14 , With this configuration, the lid has to be moved for each opening and closing movement 4 the operating lever 7 according to its open position 6 be spent, ie the blocking element 14 ' must be unblocked. In this version there is the sliding sleeve 30 provided and on the other hand a sliding sleeve 29 ' that on the housing 15 in the area of the fastening element 32 is set. In this embodiment, the gas spring exerts a compressive force between the through the retaining bolts in the unlocked state 10 . 11 formed articulation points. The mainspring 9 must be dimensioned so that it additionally compensates for this pressure.

Instead of such gas springs described, in which the actuating plunger 20 through the piston rod designed as a tube 17 out, gas springs can also be used in which the actuating tappet is led out of the end of the housing opposite the outlet of the piston rod. Such gas springs are known for example from the EP 0 353 549 B1 (corresponding JP 2-80 826 A ). In this case, the end of such a blocking element, from which the actuating plunger emerges, would be in the vicinity of the holding bolt 11 attached so that the piston rod emerging at the opposite end holds the retaining bolt 10 would be facing. Instead of the blocking elements described, it is also possible to provide lockable rods which can be moved in the direction of the tension spring using an eccentric or the like 9 can be moved and blocked in adjustable positions.

Instead of the described operating elements, which can be operated manually are, can also operating elements that can be actuated by an electric motor or electromagnet be provided.

Claims (13)

Lifting device for trunk lid of passenger cars, - with an opening movement of the lid ( 4 ) supporting tension spring ( 9 ), which - on the one hand at a pivot point ( 10 ) with the lid ( 4 ) and - on the other hand at another articulation point ( 11 ) with the body ( 1 ) of the passenger car, characterized in that the tension spring ( 9 ) a length-adjustable blocking element ( 14 . 14 ' ) is assigned, by means of which a minimum length of the tension spring ( 9 ) is adjustable. Lifting device according to claim 1, characterized in that the blocking element ( 14 . 14 ' ) is a lockable gas spring. Lifting device according to claim 2, characterized in that the blocking element ( 14 . 14 ' ) an actuating plunger ( 20 ) to block and unblock the blocking element ( 14 . 14 ' ) and that an operating element ( 25 ) for actuating the actuating plunger ( 20 ) is provided. Lifting device according to claim 3, characterized in that the operating element ( 25 ) in one position for blocking and in another position for unblocking the blocking element ( 14 . 14 ' ) is noticeable. Lifting device according to one of claims 1 to 4, characterized in that a manually operable operating element ( 25 ) to operate the blocking element ( 14 . 14 ' ) is provided. Lifting device according to one of Claims 1 to 4, characterized in that an operating element which can be actuated by an electric motor for operating the blocking element ( 14 . 14 ' ) is provided. Lifting device according to one of claims 1 to 4, characterized in that an electromagnetically actuable operating element for actuating the blocking element ( 14 . 14 ' ) is provided. Lifting device according to one of claims 1 to 7, characterized in that the tension spring as a prestressed helical tension spring ( 9 ) is trained. Lifting device according to claim 8, characterized in that the blocking element ( 14 . 14 ' ) in the tension spring ( 9 ) is arranged. Lifting device according to claim 9, characterized in that between the blocking element ( 14 . 14 ' ) and the tension spring ( 9 ) at least one sliding sleeve ( 29 . 30 ; 29 ' . 30 ) is arranged. Lifting device according to one of claims 1 to 10, characterized in that the blocking element ( 14 ) with a pivot point ( 11 ) the tension spring ( 9 ) connected and relative to the other articulation point ( 10 ) is adjustable. Lifting device according to claim 11, characterized in that the blocking element ( 14 ) at its other articulation point ( 10 ) facing end with a stop ( 18 ) is provided. Lifting device according to one of claims 1 to 12, characterized in that the blocking element ( 14 ' ) with both articulation points ( 10 . 11 ) connected is.