DE3048898A1 - SPINDLE LIFTER, IN PARTICULAR FOR MOTOR VEHICLES - Google Patents

Description

PATENT LAWYERS

DIPL-ING. P. EICHLER

DR.-ING. DieilrPHYS. H * .STURIES ^1. ^

aRAHMSSTRASSE 29, 5600 WUPPERTAL 2

3.

Company August Bilstein GmbH & Co KG, 5828 Ennepetal-Altenvoerde.

Bowl lifter, in particular for motor vehicles

The invention relates to a particular for. Motor vehicles specific spindle jack with one in one Standpipe housed and in a rotatably supported at its upper end, drivable spindle nut An outer spindle with adjustable screw height, an inner spindle with adjustable screw height as well as a blocking stop in the lower area of the outer spindle, which screwed up the outer spindle Connects position with the spindle nut on rotary drive. Such spindle jacks, in which the drive of the spindle nut in usually about a below it and with their toothed gear driven pinion driven by a hand crank are more robust and closed Design and have a comparatively large bearing

Ability, in particular, to lift trucks makes suitable .. The inner spindle is regularly provided at its upper end with a support horn, which is more suitable Place of the motor vehicle to be lifted is set. Depending on the gearbox design, when the vehicle is lifted, first the outer spindle and then the Inner spindle can be extended. At the lower end of the outer spindle, a brake or drag spring is provided that the Outer spindle the outer spindle is prevented from participating in the rotational movement of the spindle nut, thereby adjusting the screw height accordingly to become. Only when the outer spindle reaches its extended high position does the lower one work Area existing blocking stop that it is connected to the spindle nut on rotary drive, 'so that then too supported on the underside of the vehicle and thereby non-rotatable held inner spindle through which then rotating outer spindle is extended.

In known spindle jacks of the above type is on the Outer spindle existing blocking stop from attached in its outer thread at the appropriate point Weld points formed which when they hit the in the Spindle nut existing internal threads prevent further upspindling of the outer spindle in the spindle nut and thus cause the corresponding rotation lock between these parts. This known blocking method is, however, with considerable Defects, because of the on the outer spindle

existing weld spots the internal thread of the spindle nut is soon damaged or even destroyed, which is appropriate. Sluggishness between the spindle nut and the outer spindle or even render the spindle lifter unusable leads.

The invention is therefore based on the object To create a spindle lifter of the type mentioned, which is free from the aforementioned disadvantages, rather a Such blocking of the outer spindle with the spindle nut enables the latter and in particular its internal thread are extremely spared. This task is erfindungsge based on a spindle lifter of the type described in the introduction according to the fact that on the underside of the spindle nut a stop sleeve for the existing on the external spindle Block cup stop is provided. As a result, those that occur when the blocking stop hits Blocking forces over the stop sleeve over a wide area and thus gently transferred to the spindle nut without its internal thread being involved in any form will. As a result, the spindle nut can also consist of less consist of wear-resistant material. In particular, can for it Plastic can also be used advantageously.

In the case of spindle jacks, which in a known manner with an am Upper end of the standpipe arranged guide collar for the outer spindle and an overlying roller bearing for the spindle nut are provided, the stop sleeve is advantageous L-shaped profiled, with its upper horizontally extending end flange between the spindle nut

and roller bearing and with its cylindrical part located between the guide collar and the outer sleeve over the The guide collar protrudes downwards. In this way, the stop sleeve can except its, .sich by interacting with the the existing blocking stop on the external spindle Blocking function take on two more essential functions: On the one hand, it causes over their upper ones Front flange the advantageous bearing support of the spindle nut on the roller bearing, which is particularly important for spindle nuts made of plastic, and on the other hand it forms an effective guide for the with its sufficiently far downwardly extending cylindrical part Outer spindle. The same can in principle "also with two-part Formation of the stop sleeve can be achieved when the latter so z. B. from a cylindrical sleeve and one upper bearing thrust washer would exist.

The one cooperating with the stop sleeve of the spindle nut The blocking stop advantageously consists of an outer ring flange at the lower end of the outer spindle, which is provided with an annular groove and a brake spring inserted therein, which in a known manner with a Projection into an existing inside the standpipe Axial groove engages twist-proof. Since the aforementioned outer ring flange on the outer spindle is in its full high spindle If the position all around comes into contact with the stop sleeve, this results in a particularly effective addition but damage-free removal of the blocking

forces between the outer spindle and the spindle nut. The stop sleeve itself is also protected from damage.

In the drawing is an advantageous embodiment of the invention shown. Shows

Fig. 1 in partial. Schriittdarstellung the spindle lifter in the retracted position of its outer and Inner spindle while

2 shows the spindle lifter in the fully extended position its outer spindle · and with a partially extended Inside spindle reproduces. ·

The illustrated / especially intended for trucks' spindle lifter consists essentially of the standpipe 2 welded to the base plate 1, the spindle nut 3 rotatably supported at the upper end of the standpipe, the. in it screw-high adjusters stored! Outer spindle 4 and the latter in schraubhöheriverstellbar also mounted inner spindle '5 with existing at its upper end Auflageh'orn 6. -The spindle nut 3 .The, vortreilhaft is made of plastic ,: is provided with a Kegelverzähnung 3 ^1, · on them with the a corresponding 'bevel gearing 7' having drive pinion 7 is in engagement, which can optionally also consist of plastic. The drive pinion 7 has a ^{polygonal opening 7 '1} for inserting a correspondingly designed hand crank. It is rotatably mounted below the spindle nut '3 in the bearing projection 8 present on the side of the standpipe 2.

The inner spindle 5 is provided with an external thread 5 ", via which it is in the upper part 4 ¹ with ent-

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Speaking internal thread 4 ¹¹ provided external spindle · is screw-adjustable. The external spindle 4 is continuously provided with an external thread '4''' which is in engagement with the internal thread 3 ¹¹ present on the spindle nut '3.

On the underside of the spindle nut 3, an L-shaped profiled stop sleeve 9 is arranged, which is connected to the spindle nut in a rotationally fixed manner. This attachment sleeve, which can also be in two parts, engages with its upper annular flange 9 ¹ between the spindle nut 3 and the ball ring 10 located at the upper end of the standpipe 2, which is inserted into the upper end of the standpipe 2 with the interposition of the bearing washer 11 Support or guide ring 12 is supported. With its cylindrical part 9 ¹¹ , the stop sleeve engages between the support ring 12 and the outer spindle 4, with its lower end face '9''' protruding a corresponding amount downward from the support ring 12.

At the lower end of the outer spindle 4, an outer ring 13 is provided which serves as a blocking ^{stop and interacts with the end face 9 ′ 11 of} the stop sleeve 9 accordingly. At the same time, an annular groove 13 'is provided in the outer ring flange 13, in which a brake or drag ring spring 14 is arranged, which ^{engages with a corresponding projection in the axial groove 2 1} machined on the inside of the standpipe' 2 or is guided therein so that it cannot rotate.

Is based on the retracted position shown in FIG the 'spindle nut 3 over the drive pinion 7 or

• 4 a
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If the crank arm inserted in the latter is rotated, this results in an adjustment of the screw height of the outer spindle 4, since the latter is initially prevented by the brake spring 14 'from being rotationally driven by the spindle nut 3. But as soon as the 'external spindle 4 is in the' Fig. 2 shown fully extended position reaches / exceeds the acting as a blocking stop, '.Außenringflansch 13 located at the lower end of the outer spindle on deri end edge ⁹¹¹¹ of the stop sleeve 9, whereby the .Außenspindel 4 with the spindle nut. 3 is connected to rotary drive. Since from then on the outer spindle 4 thus participates in the rotary movement of the spindle nut 3 and the inner spindle 5 is blocked against rotation via its support horn 6 supported on the underside of the vehicle, there is a corresponding upward spindling of the. Inner spindle 5 through the outer spindle 4. -A 'at the lower end of the inner spindle 5 existing limiting pin 15 moves in the outermost extended position of the inner spindle 5 against the on the outer spindle 4 below its internal thread 4 ¹¹

IV
placed inner ring shoulder 4 and thus limits the maximum extension movement of the inner spindle 5 with respect to the outer spindle 4. 3 and the initially still blocked with it '. Outer spindle 4 first the inner spindle

• 5 retracted. Then comes their Auflagerhörn 6 on the upper one

V
Front flange 4 of the. Outer spindle 4 to the plant, the outer spindle 4 is blocked against further rotation ', so that then with further rotation of the spindle nut 3 in the

corresponding retraction direction the outer spindle 4 below simultaneous lifting of their outer ring flange 13 from the stop sleeve 9 is accordingly spindled down.

Claims (5)

DR.-ING. DIP ^ -PHYfe. "HIU ^ J PATENTANWÄLTE DIPL.-ING. P. EICHLER BRAHMSSTRASSE 29, 5600 WUPPERTAL 2 claims: 1. Spindle lifter, especially for motor vehicles, with a housed in a standpipe and drivable in a rotatably supported at its upper end Spindle nut screw height adjustable mounted outer spindle, an inner spindle adjustable in screw height and one in the lower area of the outer spindle existing blocking stop that holds the outer spindle in its screwed-up position with the spindle nut connects to rotary drive, thereby marked that on the bottom of the Spindle nut (3) a stop sleeve (9) for the blocking stop (13) on the external spindle (4) is provided. 2. Spindle lifter according to claim 1, with a guide collar arranged at the upper end of the standpipe for the outer spindle and an overlying roller bearing for supporting the spindle nut, characterized in that that the stop sleeve (9) is profiled Ir-shaped, with its upper horizontally (9 ¹ ) Front flange between spindle nut (3) and roller bearing (10) left unä with thjjem gwisehen the guide band (12) de » and the cylindrical part (9 ¹¹ ) located on the outer spindle (4) protrudes downward beyond the guide collar (12). 3. Spindle lifter according to claim 1 or 2, characterized g e k e η η ζ calibrate η e t that the .spindle nut (3) made of plastic. 4. Spindle lifter according to one of claims 1 to 3,: d a- characterized in that the blocking stop cooperating with the stop sleeve (9) of the spindle nut (3) consists of an outer ring flange (13) present at the lower end of the outer spindle (4), which has an annular groove (13 ¹ ) and a brake spring (14 ) is provided, which engages in a known manner with a projection in an axial groove (2 ¹ ) present in the interior of the standpipe (2) so that it cannot rotate. · 5. spindle jack according to claim 2, characterized g e k e η η · ζ e i c h η e "t that the stop sleeve (9) is designed in two parts, namely from a cylindrical sleeve and an upper bearing thrust washer consists.