CN1952774A - Retractable bracket - Google Patents
Retractable bracket Download PDFInfo
- Publication number
- CN1952774A CN1952774A CN 200610097537 CN200610097537A CN1952774A CN 1952774 A CN1952774 A CN 1952774A CN 200610097537 CN200610097537 CN 200610097537 CN 200610097537 A CN200610097537 A CN 200610097537A CN 1952774 A CN1952774 A CN 1952774A
- Authority
- CN
- China
- Prior art keywords
- supporters
- hinged
- connecting rod
- expansion bracket
- guide pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
This invention discloses a contract rack at hinge position of two supportive parts, which comprises the following parts: bottom socket set with two supportive parts with each one composed of several connection bar; shear structure combined by two supportive parts by crossing set with top device, wherein, the top end of two supportive parts are connected to level beam separately set with guide cover connected. This invention is used as supportive rack of automatic rolling projection.
Description
Technical field
The present invention relates to a kind of support, refer more particularly to a kind of by the flexible expansion bracket that can change support height arbitrarily.
Background technology
At present, people generally use, be mainly used in the expansion bracket of auto reeling projection screen, generally include: base, base is provided with two supporters, each supporter forms by some connecting rods are hinged successively, two mutual combined crosswise of supporter become the scissor type structure, two supporters are provided with jacking apparatus, jacking apparatus commonly used mainly contains two kinds on pneumatic jacking bar and hydraulic lifting bar, the top of two supporters is hinged on the crossbeam, cross one another connecting rod directly is hinged together between two supporters, and the position of this its pin joint of articulated manner is changeless.Because cross one another connecting rod is hinged and can not moves in the position of the pin joint between any and two connecting rods between two supporters, make in two supporters respectively and to be subjected to very big restriction with the connected mode of this connecting rod that upper/lower terminal of connecting rod is linked to each other, its end can not directly be articulated on base or the crossbeam, can only distinguish a hinged connecting rod again, could be hinged with base or crossbeam respectively, obviously, the mounting means of the expansion bracket of said structure has been subjected to restriction, and its stability can not well be guaranteed.
Summary of the invention
Technical matters to be solved by this invention provide a kind of in two supporters the pin joint position of cross one another connecting rod can move, more stable expansion bracket.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of expansion bracket, comprise: base, base is provided with two supporters, and each supporter forms by some connecting rods are hinged successively, and two mutual combined crosswise of supporter become the scissor type structure, two supporters are provided with jacking apparatus, the top of two supporters is hinged on the crossbeam, is movably set with guide pin bushing on cross one another connecting rod between two supporters respectively, and each flexibly connects mutually to guide pin bushing.
The upper end of above-mentioned jacking apparatus is hinged on two supporters, and the lower end is arranged on the base.
Above-mentioned jacking apparatus is the hydraulic lifting bar.
Above-mentioned jacking apparatus is the pneumatic jacking bar.
The invention has the beneficial effects as follows: because cross one another connecting rod is movably arranged in a pair of guide pin bushing that is hinged together between two supporters of expansion bracket of the present invention, make these two connecting rods in guide pin bushing, to be free to slide, also promptly: the pin joint between the connecting rod can move, make like this in two supporters to be expanded, make that the expansion bracket of this structure is more stable with the mounting means of this connecting rod that cross link is linked to each other.
Description of drawings
Fig. 1 is the main TV structure synoptic diagram of a kind of embodiment of the present invention;
Fig. 2 is the main TV structure synoptic diagram of another kind of embodiment of the present invention;
Fig. 3 is two connecting rods at pin joint place and the mounting structure synoptic diagram of guide pin bushing.
Embodiment
The invention will be further described below in conjunction with accompanying drawing, but the present invention should not only limit to this two embodiment.
Embodiment 1:
Fig. 1 shows the expansion bracket of a kind of form of the present invention, comprise: two supporters, wherein: a supporter is by connecting rod 21 and 23 hinged forming, another supporter is by connecting rod 22 and 24 hinged forming, two supporters are combined into the scissor type structure, connecting rod 23 and 24 in two supporters is hinged with the top of jacking apparatus 4 respectively, the bottom of jacking apparatus 4 is arranged on the base 1, jacking apparatus 4 both can be selected the hydraulic lifting bar for use, also can select the pneumatic jacking bar for use, connecting rod 21 in two supporters and 22 top are hinged on respectively on the crossbeam 3, and connecting rod 23 in two supporters and 24 bottom are hinged on respectively on the base 1; Connecting rod 21 and 22 infall are provided with a pair of guide pin bushing that is hinged 5, connecting rod 23 and 24 infall also are provided with the guide pin bushing 5 of a pair of same spline structure that is hinged, its structure as shown in Figure 3, each guide pin bushing 5 comprises a guide pin bushing seat 51 and a cover plate 52, two side upper edges of guide pin bushing seat 51 offer draw-in groove 511, the both sides of cover plate 52 are provided with the tenon 521 that matches with draw-in groove 511, guide pin bushing seat 51 is stitched together with cover plate 52 by draw-in groove 511 and the tenon 521 that cooperatively interacts, the bottom of guide pin bushing seat 51 also offers pin-and-hole 512, in the pin-and-hole 512 the connection pin can be set, a pair of guide pin bushing 5 is hinged together by the connection pin that is arranged in two guide pin bushing seats, the 51 bottom pin-and-holes.
When practical application, above-mentioned base 1 can also be arranged to the ground type box body, in box body, collecting device can also be set, collecting device generally includes: reel, mandrel, spring and supporting base, one end of projection screen is fixed on the crossbeam 3, the other end is fixedly installed on the reel of collecting device, and collecting device can be reeled whole projection screen wherein.When needs launch projection screen, upwards spur crossbeam 3, crossbeam 3 drives projection screen and stretches upwards, and synchronous with it, the lifting pin of jacking apparatus 4 also constantly outwards ejects under the tractive of supporter; Reel in the collecting device begins to rotate, make projection screen constantly be extracted from reel under the pulling of projection screen, simultaneously, reel drives spring and reverses together in rotation process, the spring that reverses can to projection screen extract the generation damping, prevented that projection screen occurring because of overexerting skids off the phenomenon that reel causes accumulation; Stop drag when projection screen arrives the desired position, expansion bracket is just fixed in current location by jacking apparatus 4; And when needing collapse to projection screen in the reel after use up, can push crossbeam 3 downwards, supporter bounces back downwards and oppresses lifting pin and bounces back in jacking apparatus 4, because the retraction of supporter can cause the accumulation of instantaneous projection screen, and the projection screen of piling up can be wound to rapidly in the reel under the effect of the spring that is in twisting states, constantly pushes crossbeam 3 downwards, till supporter can not move down retraction again, at this moment, projection screen all is wound in the reel.In the telescopic process of supporter, because two spacings of summit on crossbeam 3 of connecting rod 21 and 22, and two spacings of bottom on base 1 of connecting rod 23 and 24 are all fixed, therefore, want to allow two supporters flexible up and down, just must guarantee that being arranged on two pairs of pin joints on the cross link can both move, and in pin joint displacement process, angle between the pair of links of formation pin joint also can constantly change, and the connected mode between the guide pin bushing 5 of said structure and the every pair of guide pin bushing 5 just in time can satisfy this two conditions, that is: connecting rod not only can slide in corresponding guide pin bushing 5, making pin joint move becomes possibility, simultaneously, angle between the feasible pair of links that is located in this a pair of guide pin bushing 5 of the relation of being hinged between a pair of guide pin bushing 5 can change arbitrarily, thereby can guarantee that expansion bracket can freely stretch; Just because of the existence of two pairs of guide pin bushings 5, make can hold up mutually between two supporters and take, make two supporters that are in extended configuration keep good verticality, thereby make that such expansion bracket is more stable.
Embodiment 2:
Fig. 2 shows the expansion bracket of another kind of form of the present invention, comprise: two supporters, one of them supporter is by connecting rod 21 and 23 hinged forming, another supporter is by connecting rod 22 and 24 hinged forming, two supporters are combined into the scissor type structure, connecting rod 23 and 24 in two supporters is hinged with the top of jacking apparatus 4 respectively, the bottom of jacking apparatus 4 is arranged on the base 1, jacking apparatus 4 both can be selected the hydraulic lifting bar for use, also can select the pneumatic jacking bar for use, connecting rod 21 in two supporters and 22 top are articulated on the crossbeam 3 a bit, and connecting rod 23 in two supporters and 24 bottom are hinged on respectively on the base 1; Connecting rod 23 and 24 infall be provided with a pair of be hinged guide pin bushing 5, the structure of guide pin bushing 5 is described in detail in embodiment 1, no longer repeats at this.
Principle of work among the principle of work of the expansion bracket in the present embodiment and the course of work and the embodiment 1 and course of work basically identical are also no longer repeated at this.
Claims (4)
1. expansion bracket, comprise: base, base is provided with two supporters, each supporter forms by some connecting rods are hinged successively, two mutual combined crosswise of supporter become the scissor type structure, and two supporters are provided with jacking apparatus, and the top of two supporters is hinged on the crossbeam, it is characterized in that: be movably set with guide pin bushing on cross one another connecting rod between two supporters respectively, each flexibly connects mutually to guide pin bushing.
2. expansion bracket as claimed in claim 1 is characterized in that: the upper end of described jacking apparatus is hinged on two supporters, and the lower end is arranged on the base.
3. expansion bracket as claimed in claim 1 or 2 is characterized in that: described jacking apparatus is the hydraulic lifting bar.
4. expansion bracket as claimed in claim 1 or 2 is characterized in that: described jacking apparatus is the pneumatic jacking bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097537 CN1952774A (en) | 2006-11-02 | 2006-11-02 | Retractable bracket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610097537 CN1952774A (en) | 2006-11-02 | 2006-11-02 | Retractable bracket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1952774A true CN1952774A (en) | 2007-04-25 |
Family
ID=38059173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610097537 Pending CN1952774A (en) | 2006-11-02 | 2006-11-02 | Retractable bracket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1952774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944104A (en) * | 2014-05-04 | 2014-07-23 | 国家电网公司 | Telescopic live bird nest dismantling sliding plate and live bird nest dismantling method |
| CN110647003A (en) * | 2019-09-29 | 2020-01-03 | 深圳市火乐科技发展有限公司 | Curtain lifting mechanism and projection equipment |
-
2006
- 2006-11-02 CN CN 200610097537 patent/CN1952774A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944104A (en) * | 2014-05-04 | 2014-07-23 | 国家电网公司 | Telescopic live bird nest dismantling sliding plate and live bird nest dismantling method |
| CN103944104B (en) * | 2014-05-04 | 2016-05-18 | 国家电网公司 | A kind of charged dismounting Bird's Nest method |
| CN110647003A (en) * | 2019-09-29 | 2020-01-03 | 深圳市火乐科技发展有限公司 | Curtain lifting mechanism and projection equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |