BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display stand, and more particularly to a display stand constructed with a plurality of telescopic rods.

2. Description of Related Art

Large decorative displays such as a Santa Claus, Christmas tree or the like are often stood in front of shopping stores or houses as ornaments. These conventional displays must be manually assembled. Because the displays are tall, workers must use a ladder for assembling or placing other decorations. After use, the display must be manually disassembled. Therefore, it is very inconvenient and may be dangerous for the workers to assemble and decorate the displays.

Therefore, the invention provides a telescopic display stand to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a telescopic display stand which can be automatically erected for use and retracted for storage.

Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross sectional view of a telescopic display stand in accordance with the present invention;

FIG. 2 is a sectional view of the telescopic display stand in an erected status;

FIG. 3 is a partially enlarged cross sectional view of the telescopic display stand;

FIG. 4 is a top cross sectional view of FIG. 3 along the line â€œ4-4â€ ; and

FIG. 5 is a sectional view of FIG. 4 along the line â€œ5-5â€ .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIG. 1, a telescopic display stand in accordance with the present invention has a base (10) and a fixed tube (20) secured on the base (10). A first telescopic tube (30) and a second telescopic tube (40) are in turn telescopically received in the fixed tube (20). An effigy sheath with an appearance such as a Christmas tree, Santa Claus, etc. is provided outside the fixed tube (20).

The base (10) has a bottom plate (11) formed with a bottom tube (12). The fixed tube (20) is securely received in the bottom tube (12). A first threaded rod (14) is rotatably mounted in the fixed tube (20). In this embodiment, a seat (13) is provided on the bottom plate (11) with a bearing, and the first threaded rod (14) is inserted in the bearing of the seat (13). A first inner flange (21) is formed at an inner wall of a top end of the fixed tube (20).

The first telescopic tube (30) has a first stopping flange (31) formed at an outer periphery of a bottom end thereof, and a second inner flange (32) formed at an inner wall of a top end thereof. A gear box (50) is mounted in the bottom end of the first telescopic tube (30).

With reference to FIGS. 3-5, the gear box (50) has an upper housing (51) and a lower housing (53) matched to each other. A dividing plate (52) is provided between the upper housing (51) and lower housing (53). A first gear (57) and a second gear (59) are rotatably mounted in the gear box (50) and meshed with each other. A driving unit is mounted on the gear box (50) for driving the gears (57, 59). The first gear (57) has a threaded hole (571) defined therethrough, and the second gear (59) has a plain hole (591) defined therethrough.

The driving unit includes a motor (54) with an output axle extending through the lower housing (53). A first pulley (541) is fastened on the output axle of the motor (54). A shaft (521) is rotatably mounted in the dividing plate (52). A second pulley (523) is provided at a lower end of the shaft (521) and connected to the first pulley (541) by a belt (542). A pinion (522) is provided at an upper end of the shaft (521) and engaged with the first gear (57). When the motor (54) is actuated, the first pulley (541) is rotated to drive the second pulley (523) and the shaft (521). Then, the pinion (522) on the shaft (521) is rotated to drive the first gear (57) and the second gear (59).

A first bearing seat (511) is provided in the upper housing (51), and a first bearing (56) is mounted in the first bearing seat (511). A second bearing seat (523) is provided in the dividing plate (52) and aligned with the first bearing seat (511), and a second bearing (543) is mounted in the second bearing seat (523). The first gear (57) is securely provided between the first bearing (56) and second bearing (543) to let the bearings (543,56) rotate with the first gear (57). The first threaded rod (14) extends through the second bearing (543), is engaged in the threaded hole (571), and extends out from the first bearing (56). Two first nuts (55) are engaged on the first threaded rod (14) and respectively above the first bearing (56) and beneath the second bearing (543). The nuts (55) are securely attached respectively to the bearings (543,56), such that the nuts (55) are rotated with the first gear (57). Therefore, when the first gear (57) is turned, the gear box (50) can be moved upwards/downwards along the first threaded rod (14) to extend/retract the first telescopic tube (30) out/in the fixed tube (20).

A third bearing seat (524) is provided in the dividing plate (52) and aligned with the second gear (59). A third bearing (544) is mounted in the third bearing seat (524). A second threaded rod (33) has a bottom end extending through the plain hole (591) of the second gear (59) and the third bearing (544). Two second nuts (58) are engaged on the second threaded rod (33) and respectively above and beneath the second gear (59) to fix the second threaded rod (33) with the second gear (59). Therefore, the second threaded rod (33) is rotated along with the second gear (59).

With reference back to FIGS. 1-2, the second telescopic tube (40) has a second stopping flange (41) formed at an outer periphery of a bottom end thereof. A plug (42) is secured in the bottom end of the second telescopic tube (40) and has two openings (43) defined therethrough, and the first and second threaded rods (14, 33) respectively extend through the openings (43). A third nut (431) is securely received in one of the openings (43) in which the second threaded rod (33) is inserted, and engaged on the second threaded rod (33). When the second threaded rod (33) is turned along with the second gear (59), the third nut (431) can be moved upwards/downwards along the second threaded rod (33) to extend/retract the second telescopic tube (40) out/in the first telescopic tube (30).

Summarily, when the motor (54) is actuated to drive the pulleys (541, 523), the first gear (57) is driven by the pinion (522) to rotate, and the first telescopic tube (30) can be moved along with the gear box (50) upwards until the first stopping flange (31) abuts the first inner flange (21). At the same time, the second gear (59) is driven by the first gear (57) to rotate, and the second telescopic tube (40) can be moved upwards until the second stopping flange (41) abuts the second inner flange (32). Therefore, the display stand is erected automatically and the effigy sheath can be extended over the stand. When the motor is actuated reversely, the telescopic tubes (30, 40) are retracted into the fixed tube (20) to contract the display stand.

With reference to FIG. 4, the fixed tube (20) further has at least one first channel (22) longitudinally defined in the inner wall thereof, and the first telescopic tube (30) has at least one first rib (34) longitudinally formed at the outer periphery thereof and located in the first channel (22). At least one second channel (35) is longitudinally defined through the inner wall of the first telescopic tube (30), and at least one second rib (44) is formed at the outer periphery of the second telescopic tube (40) and located in the second channel (35). Therefore, the first and second telescopic tubes (30,40) can be guided to smoothly extend and retract without sway.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.