High-quality gas cylinder

Abstract

The present invention relates to a high-quality gas cylinder comprising: a tube (110) having an annular main support (111) with a through-hole formed at the center thereof; a guide bushing (120) having a lower portion press-fitted through the annular main support (111) of the tube (110) to be engaged therewith, the guide bushing having a catching annular shoulder (124) formed at a lower end thereof, a flange (121) formed at an upper portion thereof, and an operating hole (122) formed vertically therein; and a spindle (130) inserted into the operating hole (122) of the guide bushing (120) to move up and down. The catching annular shoulder (124) of the guide bushing (120) contracts and restores by its own elasticity to instantaneously pass through the annular main support (111), whereby the catching annular shoulder (124) engages with the main support (111) while the flange (121) of the guide bushing (120) simultaneously comes into close contact with the upper end of the tube (110) for firm coupling. This structure reduces work processes generated in embossing types or pin types, enables simple assembly work with strong coupling to obtain firm supporting force, prevents the guide bushing (120) from shaking or falling out even if physical energy is generated laterally while maintaining perfect concentricity, provides good surface roughness without reaming so that the spindle (130) can smoothly move up and down even without applying lubricant, and efficiently prevents lubricant from leaking outside by firmly coupled O-rings (127) if lubricant is applied.

Description

high-quality gas cylinders

[0001] The present invention relates to a high-quality gas cylinder installed for adjusting the height of a chair, etc., and more particularly, to a high-quality gas cylinder that stably guides a spindle that rotates and moves the seat of a chair up and down, prevents the shape of a guide bushing coupled to a tube from falling off or deforming, and induces smooth up and down movement with applied liquid lubricant while preventing external leakage of the lubricant.

[0002] In general, in the case of height-adjustable chairs, a gas cylinder is applied that can adjust the height of the chair seat at any time to correspond to the height of the desk or to suit the user's body structure. This gas cylinder is composed of a cylindrical tube and a spindle that supports the user's weight, and is configured to adjust the height of the chair seat to suit the user's body shape as the spindle moves up and down.

[0003] Fig. 1 is a cross-sectional view showing a typical gas cylinder of the embossing type, and Fig. 2 is a conventional cross-sectional view showing a gas cylinder of the pin type.

[0004] The above embossing type and pin type methods prevent the guide bushing from coming off by firmly connecting the guide bushing to the tube after inserting it into the tube. However, the above types have the disadvantage of increasing manufacturing costs or having a high defect rate.

[0005] Since the usage methods of FIGS. 1 and 2 are the same, referring to FIG. 1, a conventional gas cylinder (100) includes a metal tube (110) forming its outer shape, a guide bushing (120) made of synthetic resin inserted into the inside of the tube (110), and a spindle (130) that performs an up-and-down movement along an operating hole (122) formed vertically in the guide bushing (120).

[0006] Here, a cylinder (131) is mounted inside a spindle (130), a gas chamber (132) for filling gas inside the cylinder (131) is formed, an open pin (135) that is operated by a control lever (not shown) is installed on the upper part of the spindle (130), a piston rod (133a) including a piston (133) is installed inside the cylinder (131), and an operating valve (134) that controls the up and down movement of the spindle (130) is mounted on the upper part of the cylinder (133), and the operating valve (134) is a gas cylinder (100) that allows the spindle (130) to move up and down by causing the gas in the gas chamber (132) to flow through the gas passage (134a) by the operation of the open pin (135).

[0007] The above-mentioned gas cylinder (100) operates through the movement of gas, and the gas filled in the upper and lower gas chambers (132) centered on the piston (133) moves the spindle (130) up and down according to the operation of the open pin (135) formed in the operating valve (134).

[0008] However, in the case of the conventional technology of the above-mentioned gas cylinder (100), in order to smoothly slide the seat of the chair up and down, a guide bushing (120) formed of synthetic resin material is forcibly inserted into a cylindrical metal tube (110), and in order to prevent it from coming off after insertion, before inserting the guide bushing (120), force is applied from the outside to the inside on the left and right sides of the upper surface of the tube (110) to imprint an embossing (113). At this time, a deformation of the concentricity of the tube (110) occurs.

[0009] In addition, when inserting and connecting a guide bushing (120) into a tube (110), a catch block (128) for embossing hooking is formed or installed on the outer side of the guide bushing (120) so that the guide bushing (120) can be caught on the embossing (113) of the tube (110) when manufacturing the guide bushing (120), and the catch block (128) for embossing hooking of the embossing (113) of the tube (110) and the guide bushing (120) causes deformation of the concentricity of the tube (110) and the guide bushing (120) when the guide bushing (120) is inserted and connected to the tube (110).

[0010] As a result, after inserting the guide bushing (120) into the tube (110), leaving it at room temperature for more than one day to relieve the insertion stress, and then machining the inner periphery of the guide bushing (120), a difference in insertion pressure occurs depending on the concentricity generated by the embossing (113) machined into the tube (110) and the error in the outer diameter of the catch block (128) for the embossing catch of the guide bushing (120) inserted into the tube (110), and since the inner periphery of the guide bushing (120) is irregularly machined, when the user sits on the top of the chair after installing the spindle (130) on the guide bushing (120) and then moves up and down left and right by an external force, not only does it cause pinching or shaking, but it even causes a serious problem in that the guide bushing (120) comes out of the tube (110).

[0011] Conventional technologies include patent registration number 10-1599467 (title: gas cylinder) and patent registration number 10-0902182 (title: gas cylinder).

[0012] Accordingly, the main purpose of the present invention is to provide a high-quality gas cylinder that prevents deformation of the guide bushing coupled to the tube by stably guiding the spindle that rotates and moves up and down the seat of the chair while making the support force solid and greatly reducing the work man-hours and cost by eliminating the need for perforation, embossing, and reaming of the tube.

[0013] Another object of the present invention is to provide a high-quality gas cylinder that applies liquid lubricant to the outer periphery of a spindle that rotates and moves up and down the seat of various chairs, thereby inducing smooth up and down movement and preventing external leakage of the lubricant.

[0014] In order to achieve the above-mentioned purpose, the high-quality gas cylinder of the present invention comprises a tube having an annular main support member with a through hole in the center, a guide bushing having a lower portion that is press-fitted through the annular main support member of the tube and hooked together, a hooking groove formed at the lower portion, a flange formed at the upper portion, and an operating hole formed vertically, and a spindle that is inserted into the operating hole of the guide bushing and moves up and down, thereby preventing deformation of the concentricity and preventing the guide bushing from falling out or being deformed, which is a basic feature of its technical configuration.

[0015] Therefore, the high-quality gas cylinder of the present invention is made by the self-elasticity of the guide bushing's catch ring that contracts and recovers, instantly penetrating the annular main support member, so that the catch ring ring catches the main support member and at the same time, the flange of the guide bushing is firmly bonded to the upper end of the tube, thereby reducing the work man-hours that occur in embossing types or pin types, while making the assembly work simple and strongly bonding to obtain a solid support force, thereby reducing not only the cost but also the risk of the guide bushing shaking or coming off even if excessive physical energy is generated from the side, and perfectly maintaining the concentricity, and even if reaming is not performed, the surface roughness is good, so that the spindle can move up and down smoothly even if lubricant is not applied inside, and even if lubricant is applied, the lubricant is effectively prevented from seeping out due to the firmly bonded O-ring, thereby providing the best gas cylinder.

[0016] Fig. 1 is a cross-sectional view showing a conventional embossing type gas cylinder.

[0017] Fig. 2 is a cross-sectional view showing a conventional pin type gas cylinder.

[0018] FIG. 3 is a cross-sectional view showing the entire gas cylinder having a tube and guide bushing according to an embodiment of the present invention.

[0019] Figure 4 is an enlarged cross-sectional view showing a tube and guide bushing portion according to an embodiment of the present invention.

[0020] Figure 5 is a cross-sectional view showing an exploded view of a tube according to an embodiment of the present invention.

[0021] Figure 6 is a cross-sectional view showing an exploded view of a guide bushing according to an embodiment of the present invention.

[0022] Figure 7 is a perspective view showing a guide bushing according to an embodiment of the present invention.

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0024]

[0025] As shown in FIGS. 1 to 7, the high-quality gas cylinder (100) of the present invention comprises a tube (110) having a ring-shaped main support member (111) with a through hole in the center, a guide bushing (120) that is press-fitted into the ring-shaped main support member (111) of the tube (110) and hooked by forming a hooking ring (124) at the bottom, a flange (121) at the top, and an operating hole (122) formed vertically, and a spindle (130) that is inserted into the operating hole (122) of the guide bushing (120) and moves up and down.

[0026]

[0027] The above tube (110) is formed of metal in the shape of a pipe to ensure a strong support force, and has a ring-shaped lower support member (112) formed at the bottom, a ring-shaped main support member (111) corresponding to a catch ring (124) of a guide bushing (120) in the center, and a ramp (111a) formed upward on the inner periphery of the through hole of the main support member (111).

[0028]

[0029] The above guide bushing (120) is formed of synthetic resin in the shape of a pipe to have a certain degree of elasticity, and an operating hole (122) is formed vertically to guide the spindle (130) to pass through the operating hole (122) so that it can move up and down smoothly, and a flange (121) is formed on the upper part to be hung on the upper end of the tube (110), and a plurality of support ribs (123) are formed vertically on the outer periphery to secure sufficient support force.

[0030] Furthermore, it is preferable that the guide bushing (120) be formed with a hooking groove (124) facing downward from the support rib (123) so that when the guide bushing (120) is pressed into the tube (110), the hooking groove (124) can penetrate the main support member (111) and be caught, and that a ramp (124a) of the hooking groove (124) be formed so as to correspond to the ramp (111a) of the main support member (111), and at the same time, a plurality of protrusions (124b) are formed radially on the hooking groove (124), so that the guide bushing (120) can be efficiently pressed into the tube (110) and smoothly coupled.

[0031] Furthermore, the guide bushing (120) forms a ring joint (125) by widening the upper part of the inner circumference, and forms an O-ring hole (125b) for placing an O-ring (127) in the lower part of the ring joint (125) and forms a fastening groove (125a) in the inner circumference of the ring joint (125).

[0032] In addition, an annular ring support member (126) is provided that presses into the ring joint (125) of the guide bushing (120) and presses the O-ring (127) to a certain degree, and a fastening projection (126a) is formed on the outer periphery of the ring support member (126) to correspond to the fastening groove (125a) of the ring joint (125).

[0033]

[0034] The above spindle (130) is connected by penetrating into the operating hole (122) of the guide bushing (120), a cylinder (131) is installed inside, and gas is filled inside the cylinder (131) to form a gas chamber (132), and at the same time, a piston (133) is provided.

[0035] Here, the spindle (130) forms a piston rod (133a) downward of the piston (133), and the lower end of the piston rod (133a) is firmly fixed to the lower support member (112) of the tube (110) by a conventional support assembly (133b).

[0036] In addition, a conventional operating valve (134) forming a gas passage (134a) is coupled to the inner upper side of the spindle (130) and a conventional open pin (135) for closing the gas passage (134a) is provided.

[0037]

[0038] The operation of this invention is explained as follows.

[0039] First, a tube (110) having a ring-shaped main support member (111) is vertically fixed, and then a guide bushing (120) is inserted into the upper opening, so that the ramp (124a) of the catch ring (124) of the guide bushing (120) and the ramp (111a) of the main support member (111) are in close contact, and in this state, the guide bushing (120) is pressed into the inside of the tube (110) by applying a constant pressure.

[0040] At this time, the guide bushing (120) is restored by contraction due to its own elasticity by the catching ring (124) and the ring-shaped main support member (111) is instantly penetrated, and at the same time, the catching ring (124) is caught on the main support member (110) and the flange (121) of the guide bushing (120) is firmly bonded to the upper end of the tube (110).

[0041] Therefore, not only can the work man-hours that occur in embossing types or pin types be reduced, but also the assembly work can be made easy and strong, so that a solid support force can be obtained, and even if excessive physical energy is generated from the side, there is no risk of the guide bushing (120) shaking or coming off.

[0042] Moreover, the guide bushing (120) of the present invention maintains perfect concentricity, thereby enabling the supply of the best gas cylinder.

[0043] Furthermore, even if reaming is not performed, the surface roughness is good, so that the spindle (130) can move up and down smoothly even if no lubricant is applied inside, and even if lubricant is applied selectively, the lubricant is effectively prevented from leaking out to the outside by the firmly bonded O-ring (127).

[0044]

[0045] The above description has exemplified the present invention, and the embodiments disclosed in the specification are not intended to limit the technical spirit of the present invention, but rather to explain it. Therefore, those skilled in the art to which the present invention pertains will be able to make various modifications, variations, or substitutions of steps without departing from the technical spirit of the present invention. Therefore, the scope of protection of the present invention is interpreted by the matters described in the claims, and technical matters within a scope equivalent thereto should also be interpreted as being included in the scope of the rights of the present invention.

Claims

1. It is composed of a tube (110) having a ring-shaped main support member (111) with a through hole in the center, a guide bushing (120) having a lower end that is press-fitted into the ring-shaped main support member (111) of the tube (110) and hooked together, a plurality of hooking protrusions (124) formed radially at the lower end, a flange (121) formed at the upper end, and an operating hole (122) formed vertically, and a spindle (130) that is inserted into the operating hole (122) of the guide bushing (120) and moves up and down. The above tube (110) has a ring-shaped main support member (111) corresponding to the hooking groove (124) of the guide bushing (120) in the center, and forms a ramp (111a) in the through hole of the main support member (111). The above guide bushing (120) forms a plurality of support ribs (123) vertically on the outer circumference, passes a spindle (130) through the operating hole (122), and forms a hooking ring (124) spaced downward from the support rib (123), and forms a protrusion (124b) and a ramp (124a) on the hooking ring (124) to correspond to the ramp (111a) of the main support member (111), and at the same time, forms a ring-joining part (125) by widening the upper part of the inner circumference, and forms an O-ring hole (125b) for placing an O-ring (127) in the lower part of the ring-joining part (125), forms a fastening groove (125a) on the inner circumference of the ring-joining part (125), and has an annular ring support member (126) that is coupled to the ring-joining part (125), and is fastened to the outer circumference of the ring support member (126). A high-quality gas cylinder characterized by forming a protrusion (126a) to correspond to a fastening groove (125a) of a ring joint (125).

2. In paragraph 1, A high-quality gas cylinder characterized in that the spindle (130) is configured to rise and fall by penetrating the operating hole (122) of the guide bushing (120), a cylinder (131) is installed inside, gas is filled inside the cylinder (131) to form a gas chamber (132), and a piston (133) is provided, and a piston rod (133a) is formed downward of the piston (133) and is connected to the lower support member (112) of the tube (110) by a support assembly (133b), and an operating valve (134) is connected to form a gas passage (134a) on the upper side inside, and an open pin (135) is provided to close the gas passage (134a).

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