Length-adjustable telescopic tube, support jack and assembly process

1. A length-adjustable telescopic tube ( 1 ) with a longitudinal axis (L), comprising

an inner tube ( 2 ),

an outer tube ( 4 ),

at least one component ( 20 ) arranged in or on at least one of the inner tube and the outer tube ( 2 , 4 ),

at least one plug-in element ( 50 , 60 , 70 ),

first attachment structures ( 28 a , 28 b ) on the component ( 20 ),

second attachment structures ( 48 a , 48 b ) on at least one of the inner tube ( 2 ) and the outer tube ( 4 ), and

third attachment structures ( 58 , 68 , 78 ) on the plug-in element, the third attachment structures cooperating with the first attachment structures ( 28 a , 28 b ) and second attachment structures ( 48 a , 48 b ) to create form-locking connections of the component ( 20 ),

wherein the plug-in element ( 50 , 60 , 70 ) is connected in a force-locking or material-bonding manner with the at least one of the inner tube ( 2 ) and the outer tube ( 4 ).

2. The telescopic tube according to claim 1 , wherein the component ( 20 ) is a pressure-loaded component.

3. The telescopic tube according to claim 1 , wherein the first attachment structures ( 28 a , 28 b ) of the component ( 20 ) comprise at least one holding protrusion ( 21 ).

4. The telescopic tube according to claim 1 , wherein the second attachment structures ( 48 a , 48 b ) of the tube ( 2 , 4 ) comprise at least one mounting opening ( 47 a , 47 b ).

5. The telescopic tube according to claim 1 , wherein the third attachment structures of the plug-in element ( 50 , 60 , and 70 ) comprise a plug-in protrusion ( 51 , 61 , and 71 ).

6. The telescopic tube according to claim 5 , wherein the plug-in projection ( 51 , 61 , 71 ) comprises at least one web ( 54 , 57 , 64 , 67 ), on which the first attachment structures ( 28 a , 28 b ) of the component ( 20 ) abuts.

7. The telescopic tube according to claim 1 , wherein the tube ( 2 , 4 ) and the component ( 20 ) consist of different materials.

8. The telescopic tube according to claim 1 , wherein the plug-in element ( 50 , 60 , 70 ) consists of the same material as the tube ( 2 , 4 ).

9. The telescopic tube according to claim 1 , wherein the component ( 20 ) is additionally force-locked to the tube ( 2 , 4 ).

10. A support jack ( 100 ) comprising a telescopic tube ( 1 ) according to claim 1 and a spindle ( 10 ), wherein the component ( 20 ) is a bearing bracket for the spindle ( 10 ) and the bearing bracket is attached on the outer tube ( 4 ).

11. The support jack according to claim 10 , wherein the outer tube ( 4 ) has a rectangular cross-section with a rear wall ( 42 ), a front wall ( 44 ), and two side walls ( 46 a , 46 b ), wherein the component ( 20 ) is form-lockingly connected to at least two of the rear wall ( 42 ), front wall ( 42 ), and side walls ( 46 a , 46 b ) of the outer tube ( 4 ).

12. The support jack according to claim 10 , wherein in the loaded state of the support jack ( 100 ), the third attachment structures of the plug-in element ( 50 , 60 , and 70 ) are arranged in the force flux between the first attachment structures ( 28 a , 28 b ) and second attachment structures ( 48 a , 48 b ).

13. A method of assembly for at least one component ( 20 ) with first attachment structures ( 28 a , 28 b ), the component being arranged on or in at least one tube portion ( 2 , 4 ) of a telescopic tube ( 1 ) having second attachment structures ( 48 a , 48 b ) on an inner tube or on an outer tube of the telescopic tube, wherein the telescopic tube has a longitudinal axis (L), the method comprising the following steps:

a) inserting the component ( 20 ) to the tube portion ( 2 , 4 ) translatorily with respect to the longitudinal axis (L) while the tube portion ( 2 , 4 ) is in a tilted state (T 1 ) with respect to the longitudinal axis;

b) aligning the component and inserting the first attachment structures ( 28 a , 28 b ) of the component ( 20 ) in the second attachment structures ( 48 a , 48 b ) of the tube portion ( 2 , 4 , R 2 and T 3 );

c) inserting at least one plug-in element ( 50 , 60 , 70 ) having third attachment structures ( 58 , 68 , 78 ) into the second attachment structures ( 48 a , 48 b ) of the tube portion, wherein the third attachment structures ( 58 , 68 , 78 ) cooperate with the first attachment structures ( 28 a , 28 b ) and second attachment structures ( 48 a , 48 b ) to form-lockingly fix the component ( 20 ); and

d) connecting the plug-in element ( 50 , 60 , 70 ) and the tube portion ( 2 , 3 ) by at least one of a force-locking connection and a materially bonding connection.

14. The method according to claim 13 , wherein the plug-in element ( 50 , 60 , and 70 ) is inserted from the outside of the tube ( 2 , 4 ).

15. The method according to claim 13 , wherein the plug-in element ( 50 , 60 , and 70 ) is inserted from the inside of the tube ( 2 , 4 ).

16. The method according to claim 13 , wherein the at least one component ( 20 ) is moved perpendicularly to the longitudinal axis (L) (T 4 ) between steps b) and c).

17. The method according to claim 13 , wherein in step b), initially a first of two of the first attachment structures ( 28 a , 28 b ) of the component ( 20 ) is inserted into a first of the second attachment structures ( 48 a , 48 b ) of the tube ( 2 , 4 ), that the component ( 20 ) is aligned perpendicularly to the longitudinal axis (L), and that the component ( 20 ) is inserted into a further second attachment structure ( 48 a , 48 b ) perpendicularly to the longitudinal axis (L) with a second of the two of the first attachment structures ( 28 a , 28 b ).