Multi-stage, self-supporting telescopic extension system for a motorhome drawer box

Abstract

A multi-stage, self-supporting, telescopic extension system for a motorhome drawer box, comprising a vehicle body (1), a motorhome drawer box (2), two support boxes (3), a combined guide rail arrangement (5), a drive (6), and a support frame (7), wherein the motorhome drawer box (2) is arranged in an opening of the vehicle body (1), the support boxes (3) are symmetrically attached below both sides of the motorhome drawer box (2), and each support box (3) has an elongated slot opening (4), characterized in that the combined guide rail arrangement (5) is arranged in the support box (3) and comprises a first guide rail (51), a second guide rail (52), a third guide rail (53), a longitudinal connecting plate (54), a Z-shaped connecting plate (55), and a first, second, and third slide (56, 57, 58), wherein the third guide rail (53) is attached to a side wall of the support box (3).the third carriage (58) is guided with one side sliding in the third guide rail (53) and with the other side is attached to the longitudinal connecting plate (54), the second guide rail (52) is attached with one side to the longitudinal connecting plate (54) and with the other side is slidably coupled to the second carriage (57), the second carriage (57) is attached to the Z-shaped connecting plate (55), the first guide rail (51) is attached to the Z-shaped connecting plate (55) and the first carriage (56) is guided slidably in the first guide rail (51), the first carriage (56) being attached to the support frame (7), the drive (6) being attached to the support frame (7), the support frame (7) being attached to the vehicle body (1) through the elongated opening (4) and the support box (3) being movable on both sides along the support frame (7) when extending and retracting,to extend the motorhome pull-out box (2) out of the vehicle body (1) and retract it again.

Description

Technical field

[0001] The invention relates to an extension system for a laterally extendable motorhome pull-out box, in particular a multi-stage telescopic self-supporting guide system for increasing the usable interior space. State of the art

[0002] Motorhomes often use pull-out drawers to increase space; their outer wall is essentially flush with the outer surface of the vehicle body when driving, and they provide additional interior space when stationary by extending outwards.

[0003] Existing systems include, in which the extension mechanism is located in the underbody area and / or on the side of the vehicle body, which can lead to high overall height, large installation space requirements, complex assembly and difficult maintenance.

[0004] For example, CN 202111541306.4 discloses a motorhome extension structure in which the extension components are distributed below and to the side of the vehicle body, making integration and assembly more difficult and ensuring stable operation in some cases.

[0005] Furthermore, US 202117408020 A describes a pull-out system arranged on both sides of the pull-out box with complex mechanics and a comparatively high drive installation height, which can limit maintenance and space savings.

[0006] Against this background, there is a need for a compactly integrable, easy-to-install and low-maintenance pull-out system with increased extension range and improved load transfer, without unnecessarily impacting the interior of the pull-out box. Object of the invention

[0007] The object of the invention is to provide a pull-out system for a motorhome pull-out box that enables a large multi-stage pull-out range with low installation height and high integration, ensures stable guidance and simplifies assembly and maintenance. Description of the invention

[0008] The problem is solved by a multi-stage, self-supporting, telescopic extension system according to claim 1. Advantageous embodiments are described in the dependent claims.

[0009] According to the invention, the motorhome pull-out drawer is attached to support boxes arranged on both sides of the underside. A combined guide rail arrangement as well as essential parts of the support frame and the drive are integrated into the support boxes, so that the mechanism is protected and the external appearance and accessibility are improved.

[0010] The combined guide rail arrangement is designed as a three-stage telescopic extension. The cascading extension movement of several guide rails achieves a greater overall extension range, thereby significantly increasing the usable interior space of the motorhome.

[0011] The support frame is attached to the vehicle body and serves as a load-bearing structure, transferring the loads of the motorhome pull-out drawer into the vehicle body via the guide rail system. This ensures smooth, stable operation during extension and retraction.

[0012] The drive is preferably designed as a rack and pinion drive, which converts the rotary motion of a motor into a linear motion of the support unit, thus causing the extension and retraction of the motorhome drawer box. Brief description of the drawings Fig. Figure 1 shows a schematic representation of a motorhome in its initial state. Fig. Figure 2 shows a perspective view of a motorhome after the motorhome pull-out box has been fully extended in three stages. Fig. Figure 3 shows a schematic representation of a separation between the drawer box and the vehicle body. Fig. Figure 4 shows a perspective and a front view of the pull-out box. Fig. Figure 5 shows a representation of the internal structure of a carrying case. Fig. Figure 6 shows a structure of the support frame. Fig. Figure 7 shows an exploded view of the combined guide rail arrangement. Fig. Figure 8 shows a representation of the Z-shaped connecting plate. Fig. Figure 9 shows a representation of the drive system. Fig. Figure 10 shows an exploded view of the extraction system as a whole. Fig. Figures 11A to 11D show the extension process in succession: fully retracted state, extension of the third stage, extension of the second stage, extension of the first stage until the fully extended state is reached. Fig. Figures 12A to 12D show the retraction process in succession: fully retracted state, retraction of the third stage, retraction of the second stage, retraction of the first stage until the fully retracted state is reached. Example of implementation

[0013] An embodiment of the invention is explained below with reference to the drawings. Identical reference numerals denote identical or functionally equivalent components.

[0014] The pull-out system comprises a vehicle body (1), a motorhome pull-out box (2), two support boxes (3), a combined guide rail arrangement (5), a drive (6) and a support frame (7).

[0015] The motorhome pull-out box (2) is arranged in a side opening of the vehicle body (1). The support boxes (3) are symmetrically and firmly attached below both sides of the motorhome pull-out box (2).

[0016] Each support box (3) has an elongated opening (4) on its underside. Inside the support box (3) the combined guide rail assembly (5) and the support frame (7) are arranged, the guide rail assembly (5) being guided in a sliding manner both relative to the support box (3) and relative to the support frame (7).

[0017] The support frame (7) is attached to the vehicle body (1) through the elongated opening (4) and forms the load-bearing reference structure. The support box (3) moves along both sides of the support frame (7) during extension and retraction, carrying the motorhome pull-out box (2) with it.

[0018] The support frame (7) preferably comprises a top plate (703), a bottom plate (704) and a vertical plate (705). The bottom plate (704) is attached to the vehicle body (1), while the top plate (703) serves as a mounting surface for the drive (6).

[0019] The combined guide rail arrangement (5) comprises a first guide rail (51), a second guide rail (52), a third guide rail (53), a longitudinal connecting plate (54), a Z-shaped connecting plate (55) and a first, second and third carriage (56, 57, 58).

[0020] The third guide rail (53) is attached to a side wall of the support box (3). The third carriage (58) is guided slidably in the third guide rail (53) on one side and attached to the longitudinal connecting plate (54) on the other side.

[0021] The second guide rail (52) is attached to the longitudinal connecting plate (54) at one side and is slidably coupled to the second carriage (57) at the other side.

[0022] The second carriage (57) is attached to the Z-shaped connecting plate (55). The first guide rail (51) is attached to the Z-shaped connecting plate (55), and the first carriage (56) is guided slidably in the first guide rail (51).

[0023] The first slide (56) is attached to the support frame (7), preferably to the vertical plate (705). This allows the first guide rail (51) to be mounted telescopically relative to the support frame (7) and to form the innermost load-bearing extension stage.

[0024] End stop plates for extension and retraction (501A, 501B; 502A, 502B; 503A, 503B) are provided at the ends of the first, second and third guide rails (51, 52, 53) to prevent overrunning and unintentional sliding out.

[0025] The longitudinal connecting plate (54) has a third extension stop (504A) and a third insertion stop (504B), between which the third carriage (58) is mounted. When the end positions are reached, the end stop plates (503A, 503B) of the third guide rail (53) interact with the stops (504A, 504B).

[0026] The Z-shaped connecting plate (55) comprises an upper connecting plate (506), a lower connecting plate (507), and a transverse plate (508). The first guide rail (51) is attached to the upper connecting plate (506). The lower connecting plate (507) carries a second extension stop (505A) and a second retraction stop (505B), between which the second carriage (57) is mounted, so that the end stop plates (502A, 502B) of the second guide rail (52) interact with the stops (505A, 505B) in their end positions.

[0027] The support frame (7) is provided with a first extension counter-stop (701A) and a first insertion counter-stop (701B), which interact with the end stop plates (501A, 501B) of the first guide rail (51) to limit the first extension stage in the end positions.

[0028] The support box (3) is preferably open at its end facing the vehicle body (1) to allow a greater extension travel of the combined guide rail arrangement (5). A support box cover plate (301) is provided at the end facing away from the vehicle body (1) to protect the interior of the support box (3) and to reinforce the supporting structure.

[0029] The drive (6) comprises a rack (601), a motor (602), a gear (603), and a reduction gear (604). The reduction gear (604) is attached to the top plate (703). The rack (601) is attached to the support box (3). The gear (603) meshes with the rack (601), so that the rotary motion of the motor (602) is converted into a linear motion of the support box (3).

[0030] During extension, the motor (602) drives the gear (603) via the reduction gear (604), which moves the rack (601) and thus the support box (3) outwards. First, the third guide rail (53) moves relative to the third carriage (58) until the end stop plate (503A) rests against the third extension counter-stop (504A); then the second guide rail (52) is extended until the end stop plate (502A) rests against the second extension counter-stop (505A); then the first guide rail (51) is extended until the end stop plate (501A) rests against the first extension counter-stop (701A). This completes the three-stage extension process.

[0031] During retraction, the motor (602) is actuated in the opposite direction, causing the support box (3) to move inwards. The end stop plate (503B) of the third guide rail (53) interacts with the third retraction counter stop (504B), retracting the second guide rail (52) until the end stop plate (502B) rests against the second retraction counter stop (505B); subsequently, the first guide rail (51) is retracted until the end stop plate (501B) rests against the first retraction counter stop (701B). This completes the three-stage retraction process.

[0032] Throughout the entire movement sequence, the load of the motorhome pull-out box (2) is transferred via the support box (3) into the combined guide rail assembly (5) and cascaded via the slides (58, 57, 56) and connecting plates (54, 55) into the support frame (7), which transfers the total load into the vehicle body (1). This ensures stable, cantilevered movement during extension and retraction.

[0033] The invention is not limited to the described embodiment. Modifications and combinations of features are possible, provided they are covered by the scope of the claims. Reference symbol list 1 Vehicle body (body) 2 motorhome pull-out drawers 3 carrying cases 301 Carrier box cover plate 4 elongated hole opening 5 combined guide rail arrangement 51 first guide rail 501A first extension end stop plate 501B first insertion end stop plate 52 second guide rail 502A second extension end stop plate 502B second entry end stop plate 53 third guide rail 503A third extension end stop plate 503B third insertion end stop plate 54 Longitudinal connecting plate 504A third exit counterstop 504B third entry counterstop 55 Z-shaped connecting plate 505A second extension counter-stop 505B second entry counter stop 506 upper connecting plate 507 lower connecting plate 508 Cross plate 56 first sled 57 second sled 58 third sled 6 Drive 601 Rack and pinion 602 engine 603 gear 604 Reduction gearbox 7 support frames 701A first exit counterstop 701B first entry counter stop 703 Top plate 704 Base plate 705 Vertical plate QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202111541306.4

[0004] US 202117408020 A

[0005]

Claims

A multi-stage, self-supporting, telescopic extension system for a motorhome drawer box, comprising a vehicle body (1), a motorhome drawer box (2), two support boxes (3), a combined guide rail arrangement (5), a drive (6), and a support frame (7), wherein the motorhome drawer box (2) is arranged in an opening of the vehicle body (1), the support boxes (3) are symmetrically attached below both sides of the motorhome drawer box (2), and each support box (3) has an elongated slot opening (4), characterized in that the combined guide rail arrangement (5) is arranged in the support box (3) and comprises a first guide rail (51), a second guide rail (52), a third guide rail (53), a longitudinal connecting plate (54), a Z-shaped connecting plate (55), and a first, second, and third slide (56, 57, 58), wherein the third guide rail (53) is attached to a side wall of the support box (3).the third carriage (58) is guided with one side sliding in the third guide rail (53) and with the other side is attached to the longitudinal connecting plate (54), the second guide rail (52) is attached with one side to the longitudinal connecting plate (54) and with the other side is slidably coupled to the second carriage (57), the second carriage (57) is attached to the Z-shaped connecting plate (55), the first guide rail (51) is attached to the Z-shaped connecting plate (55) and the first carriage (56) is guided slidably in the first guide rail (51), the first carriage (56) being attached to the support frame (7), the drive (6) being attached to the support frame (7), the support frame (7) being attached to the vehicle body (1) through the elongated opening (4) and the support box (3) being movable on both sides along the support frame (7) when extending and retracting,to extend the motorhome pull-out box (2) out of the vehicle body (1) and retract it again. Extension system according to claim 1, characterized in that the support frame (7) comprises a top plate (703), a bottom plate (704) and a vertical plate (705), wherein the drive (6) is attached to the top plate (703), the first carriage (56) is attached to the vertical plate (705), the bottom plate (704) is attached to the vehicle body (1) and the support box (3) can be extended and retracted through the elongated slot opening (4) on both sides along the vertical plate (705). Extension system according to claim 2, characterized in that a first extension end stop plate (501A) and a first retraction end stop plate (501B) are provided at the ends of the first guide rail (51), a second extension end stop plate (502A) and a second retraction end stop plate (502B) are provided at the ends of the second guide rail (52), and a third extension end stop plate (503A) and a third retraction end stop plate (503B) are provided at the ends of the third guide rail (53). Extension system according to claim 3, characterized in that the longitudinal connecting plate (54) has a third extension counter-stop (504A) and a third insertion counter-stop (504B) which accommodate the third carriage (58) between them, wherein the third extension end stop plate (503A) cooperates with the third extension counter-stop (504A) and the third insertion end stop plate (503B) cooperates with the third insertion counter-stop (504B) to limit the end positions. Extension system according to claim 4, characterized in that the Z-shaped connecting plate (55) comprises an upper connecting plate (506), a lower connecting plate (507) and a transverse plate (508), wherein the first guide rail (51) is attached to the upper connecting plate (506) and the lower connecting plate (507) has a second extension counter-stop (505A) and a second retraction counter-stop (505B), between which the second carriage (57) is attached, wherein the second extension end stop plate (502A) interacts with the second extension counter-stop (505A) and the second retraction end stop plate (502B) interacts with the second retraction counter-stop (505B) to limit the end positions. Extension system according to claim 5, characterized in that a first extension counter-stop (701A) and a first retraction counter-stop (701B) are provided on the support frame (7), which each cooperate with the first extension end stop plate (501A) or the first retraction end stop plate (501B) for limiting the end positions. Pull-out system according to claim 6, characterized in that the support box (3) is open at its end facing the vehicle body (1) and has a support box cover plate (301) at its end facing away from the vehicle body (1). Extraction system according to claim 7, characterized in that the drive (6) comprises a rack (601), a motor (602), a gear (603) and a reduction gear (604), wherein an output shaft of the motor (602) is coupled to the reduction gear (604), the gear (603) is arranged on an output shaft of the reduction gear (604), the reduction gear (604) is attached to the top plate (703), the rack (601) is attached to the support box (3), the gear (603) meshes with the rack (601) and the rotary movement of the gear (603) drives the rack (601) to a linear movement.

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