CN201122227Y - Large screen with vertical pulling type base - Google Patents

Abstract

The utility model relates to a large-scale screen of seat ground straight-pull formula, including end box (1) and pull rod (2), roll up screen (4) on torsional spring (3) of this end box (1), the other end and pull rod (2) rigid coupling of screen (4), it has telescopic link mechanism (5) to articulate between end box (1) and pull rod (2), and this link mechanism (5) are equipped with one with the hinged end of end box (1) and are used for restricting gear train (6) of connecting rod motion. The gear set (6) is used for replacing a pneumatic (hydraulic) cylinder in the prior art to control the telescopic state of the link mechanism, and the limitation of the pneumatic (hydraulic) cylinder is overcome, so that the aims of smooth operation and low cost are fulfilled.

Description

floor-mounted large screen

technical field

The utility model relates to the technology in the field of screens, in particular to a ground-mounted straight-pull large-scale screen.

Background technique

With the rapid development of science and technology, projection equipment has been popularized, and related screens are used for demonstrations in daily conference explanations, audio-visual teaching and other places. However, the traditional screens are heavy, bulky, and difficult to carry. Gradually develop towards the design concept of light weight and easy to carry, in order to achieve the purpose of ease of use.

Today, a variety of retractable screens with different forms appear on the market, among which can refer to the portable floor-standing projection screen disclosed in Chinese patent ZL03213409.6. , the upper and lower rotary joints are set on the telescopic arm on the back of the screen, and the lower rotary joint is connected with the pneumatic (hydraulic) cylinder, and the lifting plate is connected with the upper rotary joint; the pneumatic (hydraulic) cylinder is used to drive the lower rotary joint to expand and contract. However, due to the high cost of the pneumatic (hydraulic) cylinder, it is not conducive to market competition, especially in the long-term working state of the pneumatic (hydraulic) cylinder, it will inevitably be invaded by dust and other debris, making it Attached to the telescopic support rod, resulting in unstable work of the pneumatic (hydraulic) cylinder and unsmooth operation, which brings troubles to consumers.

Utility model content

The utility model aims at the defects of the prior art, and its main purpose is to provide a floor-mounted straight-pull large-scale screen with smooth operation and low cost.

In order to achieve the above-mentioned purpose, the utility model takes the following technical solutions:

A large-scale straight-pull screen sitting on the ground, including a bottom box and a pull rod. The screen is wound around the torsion spring of the bottom box, and the other end of the screen is fixedly connected to the pull rod. A telescopic connection is hinged between the bottom box and the pull rod. A rod mechanism, the hinged end of the connecting rod mechanism and the bottom box is provided with a gear set for limiting the movement of the connecting rod.

The link mechanism includes two connecting middle rods cross-hinged with each other, and the two ends of the two connecting middle rods are respectively hinged with connecting top rods and connecting bottom rods. Hinged to the bottom box.

The gear set consists of two sets of gears that can mesh with each other and a shaft-rotating mechanism that cooperates with each gear. The shaft-rotating mechanism includes a shaft sleeve that matches the gears, a gear shaft and a bracket. On the connecting rod, the gear shaft is sleeved in the shaft sleeve and fixed on the bracket.

Between connecting the bottom bar and the bottom box, there is a tension spring which can balance the overall stress of the connecting rod and the bottom box.

Compared with the prior art, the utility model has the advantage of using the gear set to replace the pneumatic (hydraulic) cylinder in the prior art to control the telescopic state of the connecting rod mechanism, which overcomes the limitations of the pneumatic (hydraulic) cylinder, Therefore, the purpose of smooth operation and low cost is achieved.

Description of drawings

Fig. 1 is a schematic diagram of the expanded state of the utility model;

Fig. 2 is the enlarged exploded schematic diagram of the gear set of the present utility model;

Fig. 3 is a combined schematic diagram of Fig. 2;

Fig. 4 is a schematic view of the folded top view of the utility model.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 4, a floor-mounted straight-pull large-scale screen includes a bottom box 1 and a pull rod 2, the torsion spring 3 of the bottom box 1 is wound with a screen 4, and the other end of the screen 4 is connected to the pull rod. 2 is fixedly connected, so that the screen 4 is accommodated in the bottom box 1 under the action of the torsion spring 3, and when a pulling force is applied to the pull rod 2, the screen 4 will gradually unfold along the torsion spring 4.

A telescopic link mechanism 5 is hinged between the bottom box 1 and the pull rod 2, so that the screen 4 is supported by the link mechanism 5 after the screen 4 is unfolded; the hinged end of the link mechanism 5 and the bottom box 1 is provided with a gear set 6 , to utilize the meshing between the gears of the gear set 6 to limit the deployment of the connecting rod to be positioned.

The above-mentioned link mechanism 5 includes two connecting middle rods 51 cross-hinged to each other, and the two ends of the two connecting middle rods 51 are respectively hinged with connecting push rods 52 and connecting bottom rods 53, the connecting push rods 52 are hinged on the pull rod 2, and The connecting bottom rod 53 is hinged on the bottom box 1 by the above-mentioned gear set 6, so that the link mechanism 5 can be kept stable and avoid shaking.

This gear set 6 is made up of two groups of gears 61 that can mesh with each other and a pivot mechanism that cooperates with each gear 61. The pivot mechanism includes a shaft sleeve 62 matched with the gear 61, a gear shaft 63 and a bracket 64. The bracket 64 is It is fixed on the bottom box 1; the shaft sleeve 62 is installed on the gear connecting rod 7 fixedly connected to the bottom rod 53, and the gear shaft 63 is sleeved in the shaft sleeve 62 and fixedly connected on the bracket 64.

Between the connecting bottom rod 53 and the bottom box 1, there is a tension spring 8 that can balance the overall force of the linkage mechanism 5. Therefore, when the screen 4 is folded, only the tension spring 8 needs to be used to break the balance of the linkage mechanism 5. The purpose of fast folding can be realized by force.

There are two rotatable foot soles 11 pivotally connected to the bottom of the bottom box 1. When the foot soles 11 are rotated to a state vertical to the bottom box 1, the entire screen can be better landed. When the foot soles 11 are screwed in, they can be hidden, making it It does not affect the aesthetics of the overall appearance; a handle 21 is provided on the top of the above-mentioned pull rod 2, which is convenient for consumers to operate.

The working principle of the utility model is: the consumer pulls the pull rod 2 outward through the handle part 21, so that the screen 4 is unfolded around the torsion spring 3, and the connecting rod mechanism 5 is stretched accordingly. The gears 61 in 6 are meshed with each other, and the connecting bottom rod 53 below the connecting rod mechanism 5 is positioned, and the tension spring 8 between the connecting rod 53 and the bottom box 1 balances the force of the whole connecting rod mechanism 5, and then with the help of the connecting rod mechanism 5 The integrity of the rod mechanism 5 supports the screen 4; when consumers want to close the screen, they only need to apply an external force to the pull rod 2, which can break the force balance of the tension spring 8, and at the same time, under the joint action of the torsion spring 3 The screen 4 is rolled up, and at the same time, the link mechanism 5 is also folded thereupon.

The key point of the design of the utility model is to replace the pneumatic (hydraulic) cylinder in the prior art by the gear set to control the expansion and contraction state of the connecting rod mechanism, which overcomes the limitations of the pneumatic (hydraulic) cylinder, and thus realizes the operation Smooth, low-cost purposes.

The above is only a preferred embodiment of a large-scale screen of the utility model that sits directly on the ground, and does not limit the technical scope of the utility model in any way. Any minor modifications, equivalent changes and modifications still belong to the scope of the technical solutions of the present utility model.

Claims (4)

1. the large-scale screen of one kind of ground Straight pull, comprise end box (1) and pull bar (2), the screen (4) of reeling on the torsion spring (3) of this end box (1), the other end of screen (4) and pull bar (2) are affixed, be hinged with telescopic linkage assembly (5) between end box (1) and pull bar (2), it is characterized in that: this linkage assembly (5) is provided with a gear set (6) in order to the limiting rod motion with the hinged end of end box (1).

2. the large-scale screen of seat ground Straight pull according to claim 1, it is characterized in that: this linkage assembly (5) comprises the connection king-rod (51) of two mutual cross-articulation, this equal correspondence in two connection king-rod (51) two ends is hinged with and connects push rod (52) and be connected bottom bar (53), this connection push rod (52) is hinged on the pull bar (2), is hinged on the end box (1) by said gear group (6) and connect bottom bar (53).

3. the large-scale screen of seat ground Straight pull according to claim 2, it is characterized in that: this gear set (6) but by two groups of pitch wheels (61) and cooperate with each gear (61) the axle rotation mechanism form, this rotation mechanism comprise one with axle sleeve (62), gear shaft (63) and the support (64) of gear (61) coupling, axle sleeve (62) is loaded on and connects on the affixed gear connecting link (7) of bottom bar (53), gear shaft (63) is placed in the axle sleeve (62), and is fixed on the support (64).

4. the large-scale screen of seat ground Straight pull according to claim 3 is characterized in that: connect bottom bar (53) with end box (1) but between intersect and tiltedly draw the stressed extension spring (8) of a balanced connecting rod mechanism (5) integral body.

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