push-pull rod

Abstract

The invention relates to a push-pull rod (10) comprising at least one first fixing device (12), at least one first connecting piece (18) and a positioning device. The first fixing device (12) is provided with a coupling piece (12a) and a rod portion (12b) connected to the coupling piece, the first fixing device (12) is connected to the first connecting piece (18) and can be rotated by means of a thread structure (30) to change the length of the push-pull rod (10). The positioning device is provided with a first and a second positioning piece which are arranged opposite one another in the axial direction and interact, the first and the second positioning piece are pressed against one another by means of a spring piece (28), the second positioning piece of the positioning device is connected to the first connecting piece (18) in a rotationally fixed manner, the second positioning piece is connected to the first fixing device (12) in a rotationally fixed manner, the spring piece (28) acts between the region of the first connecting piece (18) and the region of the second positioning piece, and the positioning pieces lock the rotational movement of the first fixing device (12) relative to the first connecting piece (18) in a releaseable manner by means of a predetermined locking force in a plurality of rotational positions. The first connecting piece (18) comprises a base body (34) and a sleeve (36) which at least partially surrounds the two positioning pieces and the spring piece (28), the base body (34) is connected to the sleeve (36), the sleeve (36) has an inner diameter which ensures the relative movement of the positioning pieces and the spring piece (28) relative to one another, the sleeve (36) is fixed relative to the base body (34) at least in the axial direction, the first connecting piece (18) holds the positioning device in both axial directions by means of the spring piece (28). The positioning device is a locking device (22) with a first locking piece (24) and a second locking piece (26), the second locking piece (26) has a plurality of locking pins (26a) which can be engaged in locking grooves (24b) of the first locking piece (24), and the first locking piece (24) likewise has a plurality of locking pins (24a) which can be engaged in locking grooves (26b) of the second locking piece (26). In the invention, the spring piece (28) is fixed with at least one locking pin (40) corresponding to the second locking piece (26).

Description

Technical Field

[0001] This invention relates to a push-pull rod. Background Technology

[0002] Push-pull rods (e.g., used as suspension devices) are specifically designed for the suspended mounting of structural components, but can also be used for side mounting or under-mount support of items such as luggage, cabinet components, or other interior equipment, and are applicable in automobiles or aircraft. Such push-pull rods have two fasteners, each connected to a connector via a threaded structure through the rod portion. One fastener is connected to the connector via a left-hand thread, while the other is connected via a right-hand thread, allowing the overall length of the push-pull rod to be changed by rotating the connector toward the two fasteners. Because the length of this type of push-pull rod is adjustable, it can compensate for different partition heights, such as in aircraft or vehicles, to ensure that luggage or other suspended components are aligned and suspended in a horizontal plane.

[0003] To ensure that the selected push-pull rod length does not change after adjustment, an anti-rotation mechanism is provided. For this purpose, the rod portion of each fixing member interacts with a locking element that is pushed by a spring. This spring generates sufficient spring force to prevent accidental relative rotation of the locking element, thereby avoiding unnecessary changes in the push-pull rod length.

[0004] EP2320100B1 discloses a push-pull rod comprising two fixing devices, each engaging with a connector via a rod portion. The connector has two axially spaced end faces, and the two connectors are interconnected. To allow for changing the length of the push-pull rod, each fixing device is rotatably connected to the connector via a threaded structure. Additionally, the connector includes a locking device comprising first and second locking members arranged axially opposite to each other and interacting with each other, the first and second locking members being pressed against each other by a spring. The first locking member of the locking device is connected to the connector in an anti-torsional manner, and the second locking member is disposed on the fixing device in an anti-torsional manner. A first end of the spring is supported on a support shoulder formed at the connector, and a second end is supported on the second locking member. The locking members can lock the rotational movement of the fixing device relative to the connector in an unlockable manner in multiple rotational positions according to a locking force predetermined by the spring force.

[0005] This design has a significant drawback: the spring element generates varying spring forces depending on the tension position of the fixing device to prevent rotation of the locking device. When the fixing device rotates relative to its corresponding connector via the threaded structure, the fixing devices separate, causing the spring force of the spring element preventing rotation of the locking device to weaken. Conversely, when the fixing devices move closer together, the spring force increases. Another drawback is that the locking device separates from the spring element during disassembly.

[0006] The push-pull rod disclosed in WO2013 / 164243A1 overcomes the aforementioned disadvantages. The first connecting member includes a base and a sleeve that partially surrounds two positioning members and a spring. The sleeve is connected to the base and has an inner diameter that ensures relative movement between the positioning members and between the spring and the member. The sleeve is fixed relative to the base in the axial direction. The first connecting member uses the spring to hold the positioning device in two axial directions. The positioning device is a locking device with a first locking member and a second locking member. The second locking member has multiple locking pins that engage in the locking grooves of the first locking member. The first locking member also has multiple locking pins that engage in the locking grooves of the second locking member. When the first fixing device is screwed into or out of the connecting member, the locking pins of the locking device slide closer to each other against the spring force, while one locking member moves axially against the spring force. One locking member continues to move relative to the other until each locking pin engages in its adjacent locking groove. For each movement of one locking pin relative to another, the maximum force required for the first locking member to rotate relative to the second locking member is equal. During the anti-rotation process, i.e. when the locking pin is engaged in the locking groove, the spring force of the spring member is also always equal and is not affected by the movement of the first fixing device relative to the first connecting member.

[0007] The disadvantages of this design are its complex, multi-part structure, high cost, and the possibility of the sleeve coming loose during operation. Summary of the Invention

[0008] The present invention aims to provide an improved push-pull rod to overcome the above-mentioned disadvantages, while the spring force of the spring used to prevent the positioning device from rotating remains constant, i.e., it is not affected by the relative position of the fixing device and its corresponding connecting member.

[0009] A known push-pull rod includes: at least one first fixing device, having a coupling member and a rod portion connecting the coupling member; at least one first connecting member, the first fixing device being connected to the first connecting member, and rotatable via a threaded structure to change the length of the push-pull rod; a positioning device including a first positioning member and a second positioning member arranged axially opposite to each other and interacting with each other, the first and second positioning members being pressed against each other by a spring member, the first positioning member of the positioning device being connected to the first connecting member in an anti-torsional manner, the second positioning member being connected to the first fixing device in an anti-torsional manner, the spring member acting between the regions of the first connecting member and the second positioning member, and the positioning members being in multiple rotational positions, via... The rotational movement of the first fixing device relative to the first connecting member is locked in an unlockable manner by a predetermined locking force; the first connecting member includes a base and a sleeve that at least partially surrounds the two positioning members and the spring member, the base is connected to the sleeve, the sleeve has an inner diameter that ensures the relative movement between the positioning members and the spring member, the sleeve is fixed relative to the base in at least the axial direction, and the first connecting member uses the spring member to hold the positioning device in two axial directions; the positioning device is a locking device including a first locking member and a second locking member, the second locking member having a plurality of locking pins that can engage with the locking grooves of the first locking member, and the first locking member also having a plurality of locking pins that can engage with the locking grooves of the second locking member.

[0010] This invention achieves direct force transmission by directly setting a locking pin on the spring component, thereby enabling adjustable spring force.

[0011] According to the present invention, corresponding to the second locking member, at least one locking pin is directly fixedly provided on the spring member. This allows for a simple way to maintain a constant spring force relative to the first connecting member and enables easier adjustment. Furthermore, this arrangement simplifies assembly, thereby reducing costs. It also prevents individual components from becoming loose and malfunctioning.

[0012] According to one embodiment of the invention, the sleeve is fixedly connected to one or more spring members. This design simplifies assembly.

[0013] Preferably, the sleeve, spring, and locking pin of the second locking member constitute a single component unit, such as an integrated component unit, thereby greatly reducing assembly work.

[0014] To make the component unit as lightweight and easy to manufacture as possible, it can be made of plastic.

[0015] The spring element can be designed as a spring arm, protruding from the inner wall of the sleeve towards the center and equipped with at least one locking pin. This ensures ease of manufacturing.

[0016] According to one embodiment of the present invention, the shaft portion of the first fixing device is provided with a groove, and the sleeve is provided with at least one flange, which is specifically arranged radially toward the center and can engage with the groove of the shaft portion. The flange and the groove work together to prevent the sleeve and the second locking member connected to the sleeve from rotating relative to the shaft portion. The groove may extend parallel to the longitudinal axis of the shaft portion, and its length may be designed to be at least equal to the maximum distance that the threaded structure can achieve between the first fixing device and the first connecting member.

[0017] According to one embodiment of the present invention, a sleeve surrounds the shaft portion of the first fixing device, wherein the shaft portion is rotatably mounted in the base via a threaded structure and a positioning device.

[0018] Depending on the actual needs, the base and the sleeve can be connected in a detachable manner or in a non-detachable manner.

[0019] When the base and sleeve are detachably connected, it is advantageous for them to be connected by snap-fit. This ensures simple assembly.

[0020] To allow for other construction possibilities, the sleeve can be rotatably mounted on the base.

[0021] Preferably, a groove is provided around the outer circumference of the first connector, which engages with the sleeve.

[0022] Preferably, the push-pull rod further includes a second fixing device with a rod portion and a second connector, providing fixing devices on both sides of the push-pull rod and being replaceable if necessary.

[0023] The two connectors can be connected to each other via a connecting rod.

[0024] According to one embodiment of the present invention, the structures of the first and second connectors are different, that is, only the first connector is provided with a positioning device.

[0025] The first and second connectors can be inserted into and fixedly connected to the connecting rod, particularly by means of screwing and / or bonding.

[0026] Further advantages, features, and applications of the present invention may be derived from the following description and the embodiments shown in the figures.

[0027] In the specification, claims and figures, the terms and reference numerals used are listed in the reference numerals listed below. Attached Figure Description

[0028] The attached diagram is shown below:

[0029] Figure 1 This is a side view of the push-pull rod in its stretched state according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Side view of the push-pull rod in its retracted state;

[0031] Figure 3 for Figure 1 An exploded side view of the push-pull rod shown;

[0032] Figure 4 for Figure 1 The exploded side view of the first and second connectors of the push-pull rod shown, wherein the first connector does not have the sleeve, spring and second locking member;

[0033] Figure 5a for Figure 1 The first fixing device of the push-pull rod is shown in perspective. The first fixing device is inserted into the first connector, and the first and second locking members are offset from each other when rotated. The sleeve and spring surrounding the locking device are not shown.

[0034] Figure 5b for Figure 5a A perspective view of the first fixing device when the two locking parts are engaged.

[0035] Figure 6 An exploded perspective view of the front region of the first connector;

[0036] Figure 7 A perspective view of the front region of the first connector, in which the sleeve is cut open;

[0037] Figure 8 This is an exploded perspective view of the front region of the first connector and the first fixing device according to an embodiment of the present invention;

[0038] Figure 9 for Figure 8 A perspective view of the connecting sleeve shown;

[0039] Figure 10 for Figure 9 A cross-sectional view of the sleeve shown;

[0040] Figure 11 for Figure 8 A cross-sectional view of the front region of the first connector with a fixing device in the assembled state.

[0041] Figure 12 for Figure 11 A perspective view of the fixing device with connectors shown;

[0042] Figure 13 for Figure 12 The main view. Detailed Implementation

[0043] In the embodiments described below, the same elements will use the same reference numerals or the same component names, wherein the disclosure contained throughout the specification can be applied to the same elements having the same reference numerals or the same component names, depending on the meaning. Furthermore, the positional descriptions selected in the specification, such as above, below, side, etc., relating to directly described and displayed figures, must be moved to the new position according to the meaning when the position changes.

[0044] Figures 1 to 7 An embodiment of the push-pull rod 10 is shown. The push-pull rod has a modular structure, with a first fixing device 12 at one end and a second fixing device 14 at the axially distal end. The push-pull rod 10 also includes a connecting rod 16 disposed between the fixing devices 12 and 14, with a first connecting member 18 on a first side and a second connecting member 20 on a second side. At least one locking device 22 is provided in the first connecting member 18.

[0045] exist Figures 1 to 7 In the embodiment shown, the push-pull rod 10 has two fixing devices 12 and 14 that are spaced apart from each other in the axial direction. Each fixing device includes a coupling member 12a, 14a and a shaft portion 12b, 14b disposed thereon.

[0046] The first connecting member 18 is provided with a locking device 22, which prevents the first fixing device 12 from rotating relative to the first connecting member 18 after adjusting the total length of the push-pull rod 10. For this purpose, the locking device 22 has locking members 24 and 26 arranged axially opposite to each other and interacting with each other, these locking members being pressed against each other or against each other by means of a spring member 28. Spacer pads or pressure pads may also be arranged on both sides of the spring member 28 to prevent direct contact between the spring member 28 and the first connecting member 18. Such pressure pads may be made of stainless steel to minimize friction between the spring member 28 and the first connecting member 18.

[0047] Furthermore, a first threaded structure 30 is provided between the first fixing device 12, particularly its rod portion 12b, and the first connecting member 18. Another threaded structure 32 is provided between the rod portion 14b of the second fixing device 14 and the second connecting member 20, see [reference needed]. Figure 3To enable reverse adjustment of the two fixing devices 12 and 14 relative to their respective connectors 18 or 20, one of the two threaded structures used to connect the fixing devices 12 and 14—namely, the threaded structure 30 of the first connector 18 or the threaded structure 32 of the second connector 20—is designed as a right-hand thread, while the corresponding other threaded structure 30 or 32 is designed as a left-hand thread. When the two fixing devices 12 and 14 are in the coupled position relative to components not shown in detail, the reverse thread design of the threaded structures 30 and 32 allows the total length of the push-pull rod 10 to be easily changed simply by rotating the connecting rod 16 relative to the two fixing devices 12 and 14. The connecting rod 16 is fixedly connected to the connectors 18 and 20.

[0048] The threaded structures 30 and 32 have opposite leads, thereby allowing continuous adjustment of the distance between the fixing devices 12 and 14. Because the fixing devices 12 and 14 are connected to the component to be supported via their respective couplings 12a and 14a, they are held in an anti-rotation manner relative to their respective connectors 18 and 20. When the connecting rod 16 is rotated relative to the fixing devices 12 and 14, a certain degree of tension can be achieved between these components via the threaded structures 30 and 32. To facilitate manual rotation of the connecting rod 16, its surface can be designed with a non-slip structure.

[0049] The first locking element 24 of the locking device 22 is fixedly connected to the first connecting element 18, see [reference]. Figure 6 The first connector 18, like the second connector 20, can be inserted into and screwed and / or bonded to the connecting rod 16. The first locking member 24, the first connector 18, the connecting rod 16, and the second connector 20 thus form a single component unit. The second fixing device 14 is screwed into the second connector 20 via second threaded structures 32a and 32b.

[0050] In this embodiment, the thread 30a of the rod 12b is designed as an external thread, and the thread 30b of the first connector 18 is designed as an internal thread. The thread 32a of the rod 14b is also designed as an external thread, and the thread 32b is also designed as an internal thread. One of the threads 30b of the first connector 18 and 32b of the second connector 20 is designed as a right-hand thread and is connected to their respective fixing devices 12 and 14, while the other thread 30b and 32b are designed as left-hand threads.

[0051] The second locking member 26 has a bolt-shaped flange 26c, which engages in the groove 12c of the first fixing device 12. Thus, the second locking member 26 is connected to the first fixing device 12 and can rotate together, as... Figure 5a and 5b As shown in the figure. A better approach is to provide multiple flanges 26c and multiple corresponding grooves 12c on the circumference to achieve a better and more stable force transmission effect.

[0052] The first locking member 24 and the second locking member 26 are both of the indexing type. The first locking member 24 has a locking pin 24a and a locking groove 24b, and the second locking member 26 has a locking pin 26a and a locking groove 26b with the same structure as the first locking member 24. The locking members 24 and 26 are mounted opposite each other by means of their locking pins 24a, 26a and locking grooves 24b, 26b. According to this embodiment, the locking pin 24a of the first locking member 24 engages in the locking groove 26b of the second locking member 26, and the locking pin 26a of the second locking member 26 engages in the locking groove 24b of the first locking member.

[0053] The locking members 24 and 26, which are of the type of indexing plate, each have a central opening for accommodating the rod portion 12b of the fixing device 12 or the rod portion 14b of the fixing device 14.

[0054] The rotation angle and adjustability between the two locking elements 24 and 26 depend on the specific dimensions of the locking elements and the number of locking pins 24a and 26a and locking grooves 24b and 26b. If the indexing plate has more locking pins 24a and 26a and locking grooves 24b and 26b, then a finer indexing adjustment can be achieved compared to a smaller number of locking pins 24a and 26a and locking grooves 24b and 26b.

[0055] Alternatively, a friction plate or similar element can be attached to the locking members 24 and 26 to replace the locking groove, thereby allowing for more precise adjustment of the overall length of the push-pull rod 10. Microstructures can also be provided on the two facing surfaces of the locking members 24 and 26, achieving the same purpose.

[0056] The first connecting member 18 includes a base 34 and a sleeve 36. The sleeve 36 surrounds the locking members 24 and 26 from the outside, and its end facing the base 34 is fixedly connected to the base 34. The end of the sleeve 36 furthest from the base 34 has an inwardly facing annular flange 36a, the inner side of which is formed with a support shoulder 36b for supporting the spring member 28. See [reference needed] Figure 7 .

[0057] The first end 28a of the spring member 28 of the locking device 22 is supported on the support shoulder 36b of the sleeve 36 of the first connector 18, and the second end 28b of the spring member 28 is supported on the second locking member 26. The spring member 28, the sleeve 36, and the first and second locking members 24 and 26 surround the rod portion 12b of the first fixing device 12, which is screwed into the first connector 18. The first locking member 24 is supported by the base 34 of the first connector 18 because it is fixedly connected to the base 34. Since the spring member 28 is supported on the support shoulder 36b, the resulting spring force acts on the locking members 24 and 26, the base 34, and the sleeve 36, and therefore also on the first connector 18. Thus, radial anti-rotation locking of the external thread 30a of the rod portion 12b and the internal thread 30b of the first connector 18 can be achieved by the locking pin 24a and the locking groove 24b. Sleeve 36 is laterally separated from locking members 24 and 26 and spring member 28, so when the first fixing device 12 rotates, the sleeve can move freely relative to the first connecting member 18 in the axial direction against the spring force of spring member 28. Since sleeve 36 connected to base 34 on one side of base 34 holds locking device 22 in the axial direction by spring member 28, the same holding force always acts on locking device 22, regardless of the extension position of first fixing device 12 relative to first connecting member 18.

[0058] The locking elements 24 and 26, in the form of indexing plates, are independently mounted on different components of the push-pull rod 10 in an anti-torsional manner and are tensioned together by spring 28. The second locking element 26 can be easily adjusted axially against the spring force of the spring 28, thus enabling the rotational movement of the first fixing device 12 relative to the first connecting member 18 when torque is applied relative to the first locking element 24, and pre-determining locking forces at multiple rotational positions for unlockable locking. In this embodiment, the locking force corresponds to the spring force of the spring 28, as the locking pins 24a and 26a slide closer to each other, wherein the second locking element 26 moves axially until the locking pins 24a and 26a engage in adjacent locking grooves 24b and 26b. This process is repeated as long as a corresponding torque is applied between the connecting rod 16 and the first fixing device 12 until the push-pull rod 10 reaches the desired setting. During the rotation of the first fixing device 12, it screws into or out of the first connecting member 18 along the threaded structure 30, depending on the specific direction of rotation. Correspondingly, the second fixing device 14 will also be screwed into or out of the second connector 20 along the threaded structure 32.

[0059] The bolt-shaped flange 26c of the second locking 26 will move accordingly along the groove 12c of the first fixing member 12. The designed length of the groove 12c is equal to the maximum distance of the first fixing device 12 relative to the first connector 18.

[0060] Figures 8 to 13Another embodiment of the push-pull rod 10 of the present invention is shown. For this, the same components are reused as previously described. Figures 1 to 7 The same reference numerals or component names are used in the accompanying drawings. To avoid unnecessary repetition, please refer to the relevant references. Figures 1 to 7 The detailed description is in the text.

[0061] The base 34 of the first connector 18 is provided with a slot 34a next to the first locking member 24, see [link / reference]. Figure 8 and Figure 11 The sleeve 36 has an inwardly facing plug 36c at its end facing the base 34, and notches 36d on both sides of the plug 36c. The sleeve 36 can be fitted onto the locking member 24 through the plug 36c until the plug 36c is engaged in the groove 34a of the base 34. Thus, the sleeve 36 is fixed in the axial direction, but can rotate relative to the base 34.

[0062] Compared with the above embodiments, the structural design of the first fixing device 12 remains unchanged.

[0063] The sleeve 36 is provided with one or more elastic arms 38, which are disposed on the inner side of the end region of the sleeve 36 opposite to the base 34 and are oriented toward the center. Each elastic arm 38 is provided with a locking pin 40. The elastic arms 38 with locking pins 40 are arranged in a circle to form a through hole 42 for accommodating the rod portion 12b of the first fixing device 12.

[0064] Additionally, two flanges 44 are provided between two adjacent elastic arms 38, and these two flanges 44 are offset from each other by 180°. Correspondingly, the grooves 12c of the rod portion 12b are also offset by 180°. Preferably, the flanges 44, elastic arms 38, and locking pins 40 are made of the same material and form an integrated component unit. This component unit can be manufactured in a simple manner using an injection molding process.

[0065] In the two embodiments described above, connectors 18 and 20 are fixedly connected to connecting rod 16, and preferably by screwing and / or bonding. Connector 18 is provided with a locking device 22, while connector 20 is not provided with this positioning device. Therefore, connectors 18 and 20 can adopt different structural forms.

[0066] List of labels

[0067] 10 push-pull rods

[0068] 12 First fixing device

[0069] 12a Coupler

[0070] 12b rod section

[0071] 12c groove

[0072] 14 Second fixing device

[0073] 14a Coupler

[0074] 14b rod section

[0075] 16 connecting rods

[0076] 18 First Connector

[0077] 20 Second connector

[0078] 22 Locking Device

[0079] 24 First locking element

[0080] 24a Locking Pin

[0081] 24b lock slot

[0082] 26 Second locking element

[0083] 26a locking pin

[0084] 26b lock slot

[0085] 26c bolus flange

[0086] 28 spring parts

[0087] 28a The first end of spring member 28

[0088] 28b The second end of spring member 28

[0089] 30 thread structure

[0090] 30a Threaded structure - part of rod 12b

[0091] 30b Threaded Structure - Part of First Connector 18

[0092] 32 thread structure

[0093] 32a Threaded structure - part of rod 14b

[0094] 32b Threaded Structure - Part of Second Connector 20

[0095] 34 The base of the first connector 18

[0096] 34a Card Slot

[0097] 36 First connecting piece 18 sleeve

[0098] 36a flange of sleeve 36

[0099] 36b sleeve 36 support shoulder

[0100] 36c socket 36 plug

[0101] 36d sleeve with 36 notch

[0102] 38 elastic arm

[0103] 40 locking pins

[0104] 42 through holes

[0105] 44 flanges

Claims

1. A push-pull rod (10), comprising at least one first fixing device (12) with a coupling element (12a) and a rod portion (12b) connected to the coupling element (12a); at least one first connecting element (18) to which the first fixing device (12) is connected and which can be rotated by means of a thread structure (30) in order to change the length of the push-pull rod (10); a positioning device comprising a first positioning element and a second positioning element which are arranged opposite one another in the axial direction and interact, the first and second positioning elements being pressed against one another by means of a spring element (28), the first positioning element of the positioning device being connected to the first connecting element (18) in a torsion-resistant manner, the second positioning element being connected to the first fixing device (12) in a torsion-resistant manner, the spring element (28) acting between the region of the first connecting element (18) and the region of the second positioning element, and the positioning elements locking the rotational movement of the first fixing device (12) relative to the first connecting element (18) in a releaseable manner in a plurality of rotational positions by means of a predetermined locking force; the first connecting element (18) comprising a base body (34) and a sleeve (36) which at least partially surrounds the two positioning elements and the spring element (28), the base body (34) being connected to the sleeve (36), the sleeve (36) having an inner diameter which ensures the relative movement of the positioning elements relative to one another and of the spring element (28), the sleeve (36) being fixed at least in the axial direction relative to the base body (34), the first connecting element (18) clamping the positioning device in both axial directions by means of the spring element (28); the positioning device being a locking device (22) comprising a first locking element (24) and a second locking element (26), the second locking element (26) having a plurality of locking pins (26a) which can engage in locking grooves (24b) of the first locking element (24), the first locking element (24) likewise having a plurality of locking pins (24a) which can engage in locking grooves (26b) of the second locking element (26); characterized in that corresponding to the second locking element (26), the spring element (28) is fixed with at least one locking pin (40).

2. The push-pull rod of claim 1, wherein, the sleeve (36) is fixedly connected to one or more spring elements (28).

3. The push-pull rod of claim 1, wherein, the sleeve (36), the spring element (28) and the locking pin (40) of the second locking element (26) form a component unit.

4. The push-pull rod of claim 3, wherein, the component unit consists of plastic.

5. A push-pull rod according to any one of claims 1-4, characterized in that the spring element (28) is designed as a spring arm (38) which protrudes from the inner wall of the sleeve (36) towards the centre and is provided with at least one locking pin (40).

6. A push-pull rod according to any one of claims 1-4, characterized in that the rod portion (12b) of the first fixing element has a recess (12c), the sleeve (36) has at least one radially directed flange towards the centre, the flange engaging in the recess (12c) of the rod portion (12b), the flange and the recess (12c) interacting in order to prevent the sleeve (36) and the second positioning element connected to the sleeve (36) from rotating relative to the rod portion (12b).

7. The push-pull rod of claim 6, wherein, The recess (12c) is arranged parallel to the longitudinal axis of the stem (12b) and is designed with a length at least equal to the maximum distance that can be achieved by the threaded structure (30) between the first fixing device (12) and the first connecting element (18).

8. The push-pull rod according to any one of claims 1-4, wherein, The sleeve (36) surrounds the stem (12b) of the first fixing device (12), which is fixed in the base body (34) and can be rotated in the base body (34) by means of the threaded structure (30) and the positioning device.

9. The push-pull rod according to any one of claims 1-4, wherein, The base body (34) is detachably or non-detachably connected to the sleeve (36).

10. The push-pull rod according to any one of claims 1-4, wherein, The base body (34) is connected to the sleeve (36) by means of a snap-in connection.

11. A push-pull rod according to any one of claims 1-4, characterized in that The sleeve (36) is rotatably supported on the base body (34).

12. A push-pull rod according to claim 11, characterized in that The outer circumference of the first connecting element is surrounded by a clamping groove (34a) in which the sleeve (36) engages.

13. The push-pull rod according to any one of claims 1-4, wherein, A second fixing device (14) with a stem (14b) and a second connecting element (20) are also provided.

14. The push-pull rod of claim 13, wherein, The first connecting element (18) and the second connecting element (20) are fixedly connected by means of a connecting rod (16).

15. The push-pull rod of claim 13, wherein, The first connecting element (18) and the second connecting element (20) differ in their design, only the first connecting element (18) being provided with the positioning device.

16. The push-pull rod of claim 13, wherein, The first connecting element (18) and the second connecting element (20) can be inserted directly into the connecting rod (16) and fixedly connected thereto.

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