Slow descent support

Abstract

A slow descending support comprises a main rod, a tripod supporting mechanism is arranged at the lower end of the main rod, an auxiliary rod is arranged in the main rod, and the auxiliary rod is in sliding fit with the main rod through a piston and is sealed. A plurality of damping holes are formed in the side wall of the lower part of the main rod; the damping holes are opened or closed through a damping regulator; a damping plug is installed in the bottom of the main rod, and when the auxiliary rod and the main rod move relatively, the damping plug is closed. When the auxiliary rod and the main rod move oppositely, the damping plug is opened. The slow descending bracket provided by the utility model can descend gently, so that equipment is kept stable.

Description

Technical Field

[0001] This utility model relates to a support, and more particularly to a slow-descent support for supporting a projection screen. Background Technology

[0002] As shown in the patent application "Office Projector Screen Stand" with application number "201521058357.1", the office projector screen stand includes a tripod. The tops of the tripods are connected together by upper tripod retaining rings. Each leg of the tripod has a support rod in the middle, and the ends of the support rods are connected together by lower tripod retaining rings. The center lines of the upper and lower tripod retaining rings coincide and are perpendicular to the horizontal plane. The upper tripod retaining ring has a through hole in the middle, and the lower tripod retaining ring has a blind hole. A lower support tube passes through the upper tripod retaining ring, and the end of the lower support tube falls into the blind hole of the lower tripod retaining ring. An upper locking block is welded to the top of the lower support tube, and an upper locking knob is installed inside the locking block. A lower locking block is fitted below the upper locking block, and a lower locking knob is installed inside the lower locking block. The upper support tube passes through the lower support tube, and an "L"-shaped top is welded to the top of the upper support tube. When adjusting the height, the upper locking knob will pull out or lower the upper support tube.

[0003] Although the above-mentioned device has height adjustment, the support bracket holds the screen, which is quite heavy for large screens. When adjusting the height, especially when lowering it for storage, releasing the locking knob causes the main shaft to suddenly descend at a fast speed without any damping. The sudden stop after retracting can easily generate a certain impact, causing the screen to be subjected to a sudden pulling force, resulting in wrinkles and deformation, affecting the flatness of the screen, and thus affecting the effect of the projected image. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a slow-descent support that can descend slowly when the support height is reduced, thereby improving stability.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A slow-descent support includes a main rod with a tripod support mechanism at its lower end. A secondary rod is located within the main rod, and the secondary rod slides and seals against the main rod via a piston. Multiple damping holes are formed on the lower side wall of the main rod, and these holes are opened or closed by a damping adjuster. A damping plug is installed at the bottom of the main rod; the damping plug closes when the secondary rod moves relative to the main rod and opens when the secondary rod moves away from the main rod.

[0007] Limiting rings are fixed on the main rods above and below the damping hole, and the damping adjuster is slidably mounted on the limiting rings with its inner side in contact with the side wall of the main rod.

[0008] The damping regulator has a C-type structure.

[0009] The inner wall of the damping adjuster is fixed with rubber.

[0010] The lower end of the damping plug is provided with a vent hole that communicates with the outside. The upper end of the vent hole is provided with a compression chamber. A damping plate is placed at the lower end of the compression chamber and covers the vent hole. The upper end of the compression chamber is sealed by a cover plate. Multiple ventilation openings are opened on one side of the compression chamber, which connect the compression chamber with the upper part of the damping plug and the inner cavity of the main rod.

[0011] A connector is installed at the top of the main rod. The lower part of the connector is threaded, and the upper part is a slotted cone. A clamp is fitted around the connector. The upper part of the clamp is tapered, and the lower part is threaded to the connector. The tapered part of the clamp engages with the slotted cone. When the clamp and the connector move relative to each other, the slotted cone frictionally locks against the secondary rod.

[0012] The tripod support mechanism includes a base and a frame. The frame has multiple legs hinged circumferentially, and each leg has a connecting rod hinged to it. The other end of the connecting rod is hinged to the base.

[0013] The side wall of the pole frame has a slit, and the pole frame is closed and locked by clamping bolts.

[0014] This utility model provides a slow-descent support, which has the following technical effects:

[0015] 1) By incorporating a piston-equipped auxiliary rod and a damping plug, damping is generated when the slow-descent bracket retracts (the auxiliary rod retracts into the main rod), reducing the bracket's descent speed and preventing deformation or damage to the projector screen on the bracket due to excessive descent speed. When the slow-descent bracket unfolds (the auxiliary rod extends upward relative to the main rod), the damping disappears, not affecting the normal unfolding and use of the slow-descent bracket. The intended technical effect of this device is that the auxiliary rod is easily pulled out, but when it is retracted in the opposite direction of its pull-out, it retracts slowly. In this application, the clamp controls whether the auxiliary rod rises or falls, and the damping adjuster and damping plug determine the magnitude of the damping during the descent of the auxiliary rod.

[0016] 2) Considering that a projection screen or other heavy objects may be installed on the slow-descent bracket, the magnitude of the descent damping can be selected according to the load of the slow-descent bracket during descent. The damping adjuster can be used to block the damping hole, thereby controlling the air volume and thus the damping magnitude. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the installation of this utility model.

[0019] Figure 2 This is a schematic diagram of the damping regulator in this utility model.

[0020] Figure 3 This is a cross-sectional view of the lower part of the main rod in this utility model.

[0021] Figure 4 This is a cross-sectional view of the main rod and damping plug in this utility model.

[0022] Figure 5 This is a schematic diagram of the damping plug in this utility model.

[0023] Figure 6 This is a schematic diagram of the damping regulator in this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the upper end of the main rod in this utility model.

[0025] Figure 8 This is a schematic diagram of the structure of the frame in this utility model.

[0026] In the diagram: Main rod 1, damping hole 2, limiting ring 3, damping adjuster 4, damping plug 5, compression chamber 6, cover plate 7, vent 8, damping plate 9, air vent 10, auxiliary rod 11, piston 12, connector 13, clamp 14, base 15, rod frame 16, slot 17, clamping bolt 18, support leg 19, connecting rod 20. Detailed Implementation

[0027] like Figure 1-4 As shown, a slow-descent support includes a main rod 1. Multiple damping holes 2 are opened on the lower side wall of the main rod 1. Limiting rings 3 are fixed on the main rod 1 above and below the damping holes 2. The limiting rings 3 are annular and have a T-shaped cross-section. Two limiting rings 3 form an annular track. A damping adjuster 4 is slidably arranged on the annular track. The damping adjuster 4 is C-shaped in general. The damping adjuster 4 can rotate circumferentially relative to the axis of the limiting rings 3 and close all or part of the multiple damping holes 2.

[0028] The limiting ring 3 is clamped to the main rod 1 with an interference fit. Because the limiting ring 3 has a T-shaped cross-section, it can be installed on the main rod 1 regardless of its orientation. The limiting ring 3 mates with the slot inside the damping adjuster 4, and the inner end face of the damping adjuster 4 is made of rubber, which can airtightly cover the damping hole 2, thus sealing it. The number of open damping holes can be changed through the damping adjuster 4.

[0029] The bottom of the main rod 1 has an opening, at which a damping plug 5 is threadedly connected. The lower end of the damping plug 5 has a vent 10, which communicates with the outside. The upper end of the damping plug 5 has a compression chamber 6, with a cover plate 7 at its upper end. Four ventilation openings 8 are located on the side wall of the damping plug 5 on one side of the compression chamber 6, connecting the compression chamber 6 with the space above the damping plug 5 and inside the main rod 1. A damping plate 9 is installed inside the compression chamber 6, covering the vent 10.

[0030] Under normal conditions, the damping plate 9 is positioned below the vent 8 due to gravity, thus closing the vent 10. When the damping plate 9 is subjected to air pressure and moves upward, air can flow from the vent 10 into the compression chamber 6, and then from the compression chamber 6 through the vent 8 into the inner cavity of the main rod 1.

[0031] A secondary rod 11 is inserted inside the main rod 1, and a piston 12 is fixed to the end of the secondary rod 11. The piston 12 is sealed and fitted against the side wall of the main rod 1. When the secondary rod 11 moves downward, it can compress the air in the lower inner cavity of the main rod 1; when the secondary rod 11 moves upward, it can pump out air.

[0032] A connector 13 is installed at the end of the main rod 1. The lower part of the connector 13 is threaded, and the upper part is a slotted cone. After the secondary rod 11 is inserted into the main rod 1 to a certain length, the upper end of the slotted cone contacts the side wall of the secondary rod 11. A clamp 14 is fitted around the connector 13. The upper part of the clamp 14 is tapered, and the lower part is threaded to the connector 13. When the clamp 14 rotates downward, the tapered part of the clamp 14 gradually squeezes the side wall of the slotted cone of the connector 13, pressing the connector 13 tightly against the side wall of the secondary rod 11. In this way, the clamp 14 and the connector 13 are threadedly connected, one end of the connector 13 is fixedly connected to the main rod 1, and the other end is frictionally locked to the secondary rod 11, forming a whole.

[0033] Connector 13 and clamp 14 are existing technologies, commonly found in mop handle telescopic mechanisms.

[0034] A base 15 is fixed to the outer wall of the bottom of the main rod 1. A rod frame 16 is installed on the main rod 1 above the base 15. A slit 17 is provided on one side of the rod frame 16. The rod frame 16 is closed and locked by a clamping bolt 18. When the clamping bolt 18 is loosened, the rod frame 16 can move up and down. When it needs to be fixed in a certain position, the clamping bolt 18 can be tightened.

[0035] The frame 16 is circumferentially hinged with multiple legs 19, and each leg 19 is hinged with a connecting rod 20 in the middle. The other end of the connecting rod 20 is hinged to the base 15.

[0036] Working principle and process: When the clamp 14 is released and the auxiliary rod 11 is pulled upward, the air pressure inside the main rod 1 decreases under the action of the piston 12. At this time, some of the external air enters the main rod 1 through the damping hole 2, and some of the external air enters the compression chamber 6 through the vent hole 10, and then flows through the vent 8 into the inner cavity of the main rod 1. At this time, the air pressure at both ends of the piston 12 of the auxiliary rod 11 is approximately the same, making it easier to pull out the auxiliary rod 11.

[0037] When the auxiliary rod 11 is retracted, the clamp 14 is released. As the auxiliary rod 11 descends, the gas inside the main rod 1 below the piston 12 is compressed under the action of the piston 12. The compressed air exerts downward pressure on the damping plate 9, at which point the damping plate 9 closes the vent 10. Part of the compressed gas slowly escapes from the damping hole 2. Part of the compressed gas forms damping, and due to the damping, the descent speed of the auxiliary rod 11 slows down, preventing deformation or damage to the projector screen during the slow descent. The damping magnitude can be adjusted by changing the number of damping holes 2. When the upper load is large, all damping holes 2 are closed.

Claims

1. A slow-descent support, comprising a main rod (1), wherein a tripod support mechanism is provided at the lower end of the main rod (1), characterized in that: The main rod (1) is provided with a secondary rod (11), which slides and seals with the main rod (1) through a piston (12); the lower side wall of the main rod (1) has multiple damping holes (2), which are opened or closed by a damping adjuster (4); a damping plug (5) is installed in the bottom of the main rod (1), which closes when the secondary rod (11) moves relative to the main rod (1); and opens when the secondary rod (11) moves away from the main rod (1).

2. The slow-descent stent according to claim 1, characterized in that: Limiting rings (3) are fixed on the main rods (1) above and below the damping hole (2), and the damping adjuster (4) is slidably set on the limiting rings (3) and its inner side is in contact with the side wall of the main rod (1).

3. The slow-descent stent according to claim 2, characterized in that: The damping regulator (4) has a C-type structure.

4. A slow-descent stent according to claim 2, characterized in that: The inner wall of the damping adjuster (4) is fixed with rubber.

5. A slow-descent stent according to claim 1, characterized in that: The damping plug (5) has a vent (10) at its lower end that communicates with the outside. The vent (10) has a compression chamber (6) at its upper end. A damping plate (9) is placed at the lower end of the compression chamber (6) and covers the vent (10). The upper end of the compression chamber (6) is closed by a cover plate (7). Multiple ventilation openings (8) are opened on one side of the compression chamber (6). The ventilation openings (8) connect the compression chamber (6) with the upper part of the damping plug (5) and the inner cavity of the main rod (1).

6. A slow-descent stent according to claim 1, characterized in that: The main rod (1) is equipped with a connector (13) at the top. The lower part of the connector (13) is a threaded part and the upper part is a slotted cone. A clamp (14) is fitted on the outside of the connector (13). The upper part of the clamp (14) is a tapered part and the lower part is threaded to the connector (13). The tapered part of the clamp (14) cooperates with the slotted cone. When the clamp (14) and the connector (13) move relative to each other, the slotted cone and the auxiliary rod (11) are rubbed and locked.

7. A slow-descent stent according to claim 1, characterized in that: The tripod support mechanism includes a base (15) and a frame (16). The frame (16) has multiple legs (19) hinged around it in the circumferential direction. Each leg (19) has a connecting rod (20) hinged on it. The other end of the connecting rod (20) is hinged to the base (15).

8. A slow-descent stent according to claim 7, characterized in that: The side wall of the pole frame (16) is provided with a slit (17), and the pole frame (16) is closed and locked by clamping bolts (18).

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