JPH0618743U - Lift device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a lift device that is used by being attached to a chair that is lightweight and does not cause anxiety about strength because it generates lift power with gas. [Structure] One end is sealed by a sealing means 11 and the other end is formed into an opening shape, and both opening ends are fitted so as to be removable.
The sliding contact portion is kept slidable and airtight by the sealing means 22 and the lower tube body 2 is provided inside the upper tube body 1, the upper end is fixed to the sealing means 11 of the upper tube body 1, and the lower end is the lower tube. An inner pipe 3 having a vent hole 31 provided at an appropriate position on the lower end peripheral surface by being inserted into an axial hole 23 formed in the axial center portion of the plurality of sealing means 22 of the body 2; A piston 4 provided with a passage 41 that can be attached to partition the inside of the lower pipe body 2 into upper and lower spaces 24 and 25, and that has a passage 41 that allows gas to flow into the upper and lower spaces 24 and 25; A control knob 52 is provided at an upper end extending from the upper tube body 1, a lower end is inserted into the passage 41, and a valve 53 is provided at a tip to control the opening and closing of the passage 41.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lift device.

[0002]

[Prior art]

 In general, there are different types of lifting devices, the most common being the lift bar, which raises and supports the door with auxiliary springs, for example when opening the rear door or trunk lid of a five-door hatchback passenger car. , There is a vertical axis bar that moves up and down in currently used office swivel chairs. There are various lift power generation means of these lift devices. Taiwan Utility Model Registration No. 60309, which is the applicant of the present invention, uses pressurized liquid and gas as shown in FIG. In this method, the lift power is accumulated by utilizing the property that the gas contracts in volume when compressed (the gas usually uses a sufficient volume of pressurized nitrogen gas, as shown in the figure. The spring a may be used for the liquid), and since the volume of the liquid does not change even if it is compressed, it is made to flow by the control of the valve b to push the piston c and reduce the space occupied by the gas. The gas that has not decreased in volume is compressed by the reduction of the volume space and accumulates energy. When the external force is released, the force that pushes back the piston b and restores the original volume is lifted. It forms power.

[0003] And, what can be seen at present as simply generating lift power by using gas is a lift bar that raises and supports doors when opening the rear doors of the above-mentioned five-door hatchback passenger cars. As shown in FIG. 7, the structure is such that a pipe-shaped piston rod B is inserted into and removed from a pipe-shaped cylinder A, and the cylinder A is filled with high-pressure gas (usually nitrogen gas). Then, a connecting portion A1 is provided at one end of the cylinder A so as to be connected to an appropriate position of the vehicle rear door frame or a vehicle body in the vicinity thereof, and the other end into which the piston rod B is inserted is slidable and airtight with respect to each other. A circular piston B having a through hole B2 at the front end of the piston rod B inserted into the cylinder A and having a pair of rings A2 and A3 for sealing fixedly held therein. 1, the other end of the piston rod B extends through the sealing end of the cylinder A and extends outside the cylinder A pipe, and a connecting portion B3 is provided at the extended end of the piston rod B. To be

The operation and operation principle of this type of lift bar is as shown in FIG. 8, in which the connecting portions A1 and B3 of the pipe-shaped cylinder A and the pipe-shaped piston rod B are connected to, for example, an automobile door and a vehicle body, and When the internal gas overcomes the weight of the door turning end by the high pressure and the lift bar is fully extended and the door is closed strongly from the lifted position, the external force F is applied in the axial direction, and the piston B moves to the cylinder. The volume of the two spaces X and Y formed in the cylinder A is changed by sliding toward the other end in A, and the pressure P _X in the space X is larger than the pressure P _Y in the space Y that gradually expands. However, since the piston B1 is provided with a very small through hole B2, the gas in the space X slowly enters the space Y through the through hole B2, and finally the pressure in both spaces X, Y is reached. Equal That. That is, P _X = P _Y , and the force received by the contact surface of the piston head B1 with the space X at this time is F _X = P _X × A _X , of which the area A _X = π (D / 2) ² It The area of the contact surface of the piston B1 with the space Y is A _Y = π (D / 2) ² −π (d / 2) ² , and the force received is F _Y = P _Y × A _Y In order to maintain the balance of force, the condition of F _X = F _Y + F is necessary. If the force F at one end of the lift bar is removed, that is, if the lift door of the vehicle is opened, F _X > F _Y, and X The gas in the space expands and the pressure pushes the piston B1, and the position is moved so that the door is lifted by sliding in the direction in which the lift bar extends, and since the through hole B2 is not so large, the lifting speed is It's not too fast, it has an ideal and flexible lift action.

[0005] Thus, the one that simply uses gas to generate the power source of the lift is found only in the rear door lift bar of the hatchback passenger car that stops only in the two locks, the open door and the closed door. Since it cannot be provided with a positioning means (for example, a valve) to be stopped at the intermediate position, it cannot be directly diverted to a chair. On the other hand, the Taiwan Utility Model Registration No. 60309 proposed by the applicant has a controllable valve, but due to its structure, it can be applied only when working oil and compressed gas are used in combination, and it is expected to reduce the weight. In addition, it is not suitable for the purpose of the present invention (the operating principles of the two are different), and when any of the two is used as a chair lift device, the chair is always placed with its piston rod side as the lower end. It must be fixed to the leg (Q in FIG. 6), and its upper end is fixed to the chair seat bottom end P, but in terms of weight reduction, the piston rod is generally formed with a diameter of about 8 mm. In terms of strength to support the human body, it is considered to be somewhat unstable. The R shown in Fig. 6 represents a plastic sleeve, which is fitted to the peripheral wall of the piston for dustproofing and decoration, but it gives the impression that it is thick in appearance and also has the implication that it is safe. Although included, in fact the danger still exists.

[0006]

[Problems to be solved by the device]

 In view of the above-mentioned problems in the conventional lift device, the present invention is a lift device that is used by being attached to a chair so that lift power is generated by using gas to reduce anxiety regarding weight reduction and strength. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has one end sealed by a sealing means and the other end formed in an opening shape, both opening ends of which are removably fitted and the sliding contact portions of both are sealed. And a lower pipe body, which is provided inside the upper pipe body, has an upper end fixed to the sealing means of the upper pipe body, and a lower end portion of the lower pipe body. An inner pipe having a ventilation hole formed at an appropriate position on the peripheral surface of the lower end thereof by being inserted into the axial holes formed in the respective axial center portions of the sealing means; A piston provided with a passage for partitioning the inside of the tubular body into both upper and lower spaces, and a passage for allowing gas to flow through the upper and lower spaces; provided in the inner pipe and extending from the upper pipe body Install a control knob at the upper end, insert the lower end into the above passage, and install a valve at the tip to Constructed by combining; and a valve rod for controlling the opening and closing.

Of the plurality of sealing means provided inside the upper end of the lower pipe body, the shaft hole of the sealing means at a position corresponding to the vent hole of the inner pipe is larger than the outer diameter of the inner pipe. It is more preferable to form a flow path, fit a sleeve on the outer periphery of the lower tube lower end, and provide a bush on the inner peripheral surface of the upper end of the sleeve so that the sleeve can be attached to the outer peripheral surface of the upper tubular member so that it can slide. .

[0009]

[Action]

 According to the present invention configured as described above, the weight is loaded above the upper tube, the control knob extended from the top end of the upper tube is operated to open the valve, and the lower tube is moved downward. Along with this, the inner pipe also moves downward and the upper space is formed while the piston shrinks the lower space of the lower pipe body, and the high-pressure gas in the lower pipe body passes through the passage of the piston and the ventilation hole of the inner pipe to the upper space. As they enter the space, the gases accumulate more high pressure. When the control switch is operated to close the passage with the valve, the gas in the upper and lower spaces of the lower pipe cannot flow, and the upper pipe keeps a static state while maintaining a balance, that is, The upper tube can be fixed by pushing it down to an appropriate height while supporting the loaded weight above it. On the other hand, when the upper pipe body is raised, only the gas in the lower space expands and recovers as the loaded weight above it is removed, pushing up the piston, and the atmospheric pressure in the lower space rises. When the pressure becomes lower than atmospheric pressure and the valve is opened by further operating the control knob, the high pressure gas accumulated in the upper space of the lower pipe is circulated to the lower space, and the gas in the lower pipe is originally And the piston is pushed up greatly, and therefore the upper tube can be raised.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description of the embodiments with reference to the drawings.

[0011]

【Example】

 FIG. 1 is a structural view of an embodiment of the present invention, which includes upper and lower pipes 1 and 2, an inner pipe 3, a piston 4 and a valve rod 5 as shown in the drawing; The inside is sealed by the sealing means 11, and a tapered peripheral wall that is loosely narrowed toward the upper end to the outside is formed so that it can be combined with a chair, and the lower end thereof is opened so that it can be freely inserted into and removed from the lower tube body 2. It can be so.

The lower tube body 2 is provided with a sealing means 21 at its lower end to seal the inside of the lower end, and a screwing portion 211, which extends from the lower end of the sealing means 21 and is engraved with a screw, is provided in a convex shape to form a chair leg. The upper end of the lower tube 2 is removably fitted in the opening of the lower end of the upper tube 1 so that the peripheral wall surface is slidably airtightly sealed with the inner peripheral wall of the upper tube 1. In addition, a plurality of sealing means 22 are provided at the upper end for sealing, and a shaft hole 23 is bored in the corresponding central portion of each seal means 22, and the shaft of the sealing means 221 at the lowest position is formed. The hole 231 is made larger than the outer diameter of the inner tube 3 to form a gas flow path, and the internal space of the lower tube body 2 is filled with high-pressure gas (usually nitrogen gas).

The inner pipe 3 is provided inside the upper pipe body 1, the upper end is fixed to the end portion of the upper pipe body 1 where the sealing means 11 is provided, and the lower end is the sealing means for the lower pipe body 2. It is inserted into the shaft hole 23 of 22 and the end thereof is just fitted to the piston 4 in the lower pipe body 2 so that it can be interlocked with the piston 4, and further, the lower pipe body 2 of the side wall of the inner pipe 3 is connected. A vent hole 31 communicating with the through hole 231 is bored at a position corresponding to the lowest seal means 221.

The piston 4 can slide and move in the lower pipe body 2 while maintaining airtightness, and a passage 41 is provided to allow the gas of the lower pipe body 2 to flow along the inner circumference of the inner pipe 3. To be.

The valve rod 5 is provided in the inner pipe 3 and has a control knob 52 (a knob shown in the figure) in which the top end of the spring 51 is in contact with the bottom end of the upper end extending from the upper pipe body (1). The shape is limited to a single display, and in practice, various types of suitable ones may be used, and the valve 53 (valve rod 5 is considerably elongated and is manufactured in two stages) at the lower end. As shown in the sectional lines of both stages in the figure, the upper stage only pushes and pushes the lower stage, and the lower stage under the action of the high pressure gas inside the lower pipe body 2 at a proper time. (The passage 41 of the piston 4 is kept closed), and a ring-shaped sealing means 54 is mounted between the valve rod 5 and the inner pipe 3 so that gas leaks to the outside through the inner pipe 3. Prevent from doing so.

FIG. 1 shows the lifting state of the embodiment of the present invention. When the embodiment lowers and shortens, the control rod 52 is first pushed downward as shown in FIG. 5 moves downward in conjunction with the valve 53 to open the passage 41 of the piston 4, and allows the high pressure gas in the lower pipe body 2 to enter the inner pipe 3 through the passage 41, and further to the vent hole 31. It is released by being introduced into the shaft hole 231 of the sealing means 221 via the inner tube 3 and the upper tube 1 is pushed downward by the weight of the human body sitting on the chair and moves downward. Since the upper tube body 1 and the upper tube body 1 are interlocked together, the inner tube 3 pushes the piston 4 downward at this time to reduce the gas volume space in the lower tube body 2 to allow the gas to further flow into the passage 41. 3 Flowed into the shaft hole 231 from the bottom through the ventilation hole 31. The gas enters another space 25 formed inside the lower tube body 2 partitioned by the piston 4 as the piston 4 moves downward. After waiting for the upper tube 1 to reach the desired height position, the control knob 52 is released to close the valve 53, while the air in both spaces 24, 25 in the lower tube 2 can flow. It loses its balance and remains stationary.

Incidentally, the spaces 24 and 25 in the lower pipe body 2 have different cross-sectional areas (the inner pipe 3 exists in the space 25), so naturally the volumes are different, but the space is larger than the space 24. Since the amount of gas flowing into 25 is the same, the gas staying in the space 25 becomes relatively compressed by the gas in the space 24 when the weight supported above the upper tubular body is removed. When the upper tube 1 is raised, the control knob 52 is pushed downward to open the valve 53 and open the space 25 of the lower tube 2 when the upper tube 1 is raised. The more compressed high-pressure gas in the inside flows into the space 24, the volume of the space 24 increases, and the force that the gas tries to recover to the original volume works to push up the piston 4 and the inner pipe 3 moves upward. The tubular body 1 will be lifted in conjunction with the upper tubular body 1 Once the chair seat is at the desired height, the control knob can be released to close valve 53 and keep the chair seat at that desired height.

Further, according to the present invention, since the gas in the space 25 is more compressed and maintains a higher pressure recovery force, the high pressure of the gas overcomes the spring 51 elasticity of the control knob 52, or dew condensation occurs. Because of the elastic decrease due to the valve, it often happens that the valve 53 leaks into the space 24 of the lower tube body 2 and the chair seat above which should be fixed at an appropriate height gradually rises. In addition to providing the valve 53 on the valve rod 5, there is also a proposal to further add a non-return means, and as shown in FIG. 4, an enlarged portion 55 is mainly formed at the lower end of the valve rod 5, and the passage of the piston 4 41. A neck portion 42 having an appropriately reduced cross-sectional area is provided on the way, and the diameter of the neck portion 42 is made larger than the outer diameters of the valve rod 5 and the enlarged portion and connected to the lower edge of the neck portion 42. Check ring 7 Set up. The check ring 7 is made of a flexible material so as to have a substantially V-shaped cross section, and a lip peripheral edge 71 having a thin wall thickness is provided at the inner peripheral edge of the check rod 7 which is inserted into the valve rod 5 so as to rise toward the valve rod 5. Then, the inner diameter of the lip periphery 71 is made larger than the outer diameter of the valve rod 5 and smaller than the outer diameter of the enlarged portion 55, and when the valve 53 is opened, as shown in FIG. Gas flows into the space 25 through the through hole 41, the gap between the lip edge 71 of the check ring 7 and the valve rod 5, and the gap between the neck portion 42 and the valve rod 5, and when the valve 53 closes the passage 41. As shown in FIG. 5, since the inner diameter of the lip periphery 71 of the check ring 7 is smaller than that of the enlarged portion 55, the lip periphery 71 should contact the upper end surface of the enlarged portion 55 to close the neck portion 42. Therefore, even if the gas in the space 25 tries to flow into the space 24, the lip periphery 71 is elastically deformed and more closely adheres and seals to the top end surface of the enlarged portion 55, and the high-pressure gas in the space 25 cannot escape. The perfect sealing function can be achieved.

As can be seen from the above description, in the present invention, the lift power is completely gas driven, and the spatial structure formed by the lift power is obtained by fixing the upper and lower pipe bodies 1 and 2 to the chair seat and chair leg, respectively. Since it provides stable and stable supporting means, it is possible to achieve the purpose with the expected effects of the present invention. As shown in FIG. 3, the sleeve 6 is fitted around the sealing means 21 at the lower end of the lower tubular body 2, and a taper is gently converged on the outer periphery of the lower end of the sleeve 6 toward the bottom edge. -Shaped peripheral wall is formed so that it can be easily fitted into the chair leg, or a plastic bush is fitted between the inner peripheral surface of the upper end of the sleeve 6 and the outer peripheral surface of the lower tube body 2 to improve stability. It may be possible to achieve the decoration purpose with it.

[0020]

[Effect of device]

 Since the present invention is configured as described above, the upper tube is fixed to the bottom end of the chair seat, the lower end of the lower tube is fixed to the chair leg, and the control knob is mounted on the chair seat. Press to lower the chair seat to the proper height and release the control knob to secure the chair seat to that proper height. On the other hand, when it is desired to raise the chair seat, the weight of the human body is temporarily removed and the control knob is pushed. When the chair seat gradually rises to a desired height, the chair knob is released by releasing the control knob. It can be fixed at the height. Therefore, it can be applied as a chair lift device and can have relatively excellent stability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an operation state display diagram of the embodiment of FIG.

FIG. 3 is a view showing a sleeve fitted in the embodiment of FIG.

FIG. 4 is a structural view of the embodiment of FIG. 1 with a check means attached and opened.

FIG. 5 is a structural view showing a state where the check means of FIG. 4 is closed.

FIG. 6 is a cross-sectional view showing an example of a conventional technique.

FIG. 7 is a structural view of a lift device using gas.

FIG. 8 is a diagram showing the operating principle of a lift device using gas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper tubular body 2 ... Lower tubular body 11 ... Sealing means 21 ... Sealing means 22 ... Sealing means 221 ... Sealing means 23 ... Shaft hole 24 ... Space 25 ... Space 3 ... Inner pipe 31 ... Vent hole 4 ... Piston 41 ... Passage 5 ... Valve rod 52 ... Control knob 53 ... Valve 6 ... Sleeve 61 ... Bush

Claims (3)

[Scope of utility model registration request] 1. A sealing means (11, 2) is provided at each end.
1) is sealed and the other end is formed into an open shape, both open ends are fitted so that they can be inserted and removed, and both sliding contact parts can be slidably and airtightly maintained by the sealing means (22). Upper and lower pipes (1, 2); provided inside the upper pipe (1), the upper end is fixed to the sealing means (11) of the upper pipe (1), and the lower end is the lower pipe. Axial holes (2) formed in the axial center portions of the plurality of sealing means (22) of the body (2)
3), and vent holes (3
An inner pipe (3) provided with 1); and fitted into the tip of the lower end of the inner pipe (3) to partition the inside of the lower pipe body (2) into upper and lower spaces (24, 25) in a timely manner. And a passage (4) for allowing gas to flow through the upper and lower spaces (24, 25).
A piston (4) provided with 1); a control knob (52) is provided on the upper end of the piston (4) provided in the inner pipe (3) and extending from the upper pipe body (1), and the lower end is attached to the above. The valve (53) is provided at the tip of the passage (41) by being inserted into the passage (41).
And a valve rod (5) for controlling opening and closing of the lift device. 2. The sealing means (22) at a position corresponding to the ventilation hole (31) of the inner pipe (3) among a plurality of sealing means (22) provided inside the upper end of the lower pipe body (2).
The lift device according to claim 1, wherein the shaft hole (23) of 1) is larger than the outer diameter of the inner pipe (3) to form a gas flow path. 3. A sleeve (6) is fitted around the lower end of the lower tube (2), and a bush (61) is provided on the inner peripheral surface of the upper end of the sleeve (6) to provide an outer peripheral surface of the upper tube (1). The lift device according to claim 1, wherein the lift device is attached to and is slidable.