JP2007008452A - Caster device with sliding body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caster device capable of restricting the rotational motion of a wheel when a load is applied to a moving body for the moving convenience of the moving body such as a chair and a furniture, and reducing the friction between an axle connected to the wheel and its peripheral member. <P>SOLUTION: An axle (62) is supported by a moving body (70) which is stored in a vertically movable manner within a cover body (51). A vertically long pin guide hole (72) to guide the vertical movement of the cover body (51) is formed on both sides of an axle hole (71) with the axle (62) fitted therein. A pin (58) is inserted in a pin fitting hole (57) formed in the cover body (51) while the moving body (70) is assembled to the inside of the cover body (51). A spring (75) for constantly pushing up the cover body (51) upwardly is interposed between an upper surface of the moving body (70) and an inner upper surface of the cover body (51). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a caster device provided with a moving body, and more particularly, to improve the structure of a caster to be attached to a lower end of a leg of a chair, desk, furniture, etc. The present invention relates to a caster device provided with a moving body that limits the rolling motion of the wheel when the load is applied, and reduces wear between the axle connected to the wheel and its surrounding parts to improve wear resistance. Is.

General moving bodies such as chairs, desks, hospital beds, etc. are provided with casters for improving convenience of movement, but such casters are formed in a state that can always rotate depending on the purpose of use. When a load in the vertical direction is applied, for example, when the user sits on the moving body, the rolling operation of the wheels stops and the moving body such as a chair does not move.

  For example, as shown in Patent Document 1, when a person is not sitting, the rolling operation of the caster wheel is free and the chair can be moved in a desired direction. A device is disclosed in which the position of the chair is fixed without the caster wheels rolling when sitting and carrying weight, and this technique is illustrated in FIGS.

  In the caster device shown in FIG. 6, a long hole 13 is formed in the upper body 12, and an axle hole 15 for fitting the axle 19 of the wheel 11 is formed in the lower body 14.

  In addition, a spring 17 is interposed between the protruding bar 16 formed on the upper body 12 and the lower body 14, so that a load is applied to furniture such as a chair equipped with the caster device. While the spring 17 is compressed, the lower body 14 comes into contact with the ground and the wheel 11 is separated from the ground by a predetermined distance.

  FIG. 7 shows a support leg 20 having an open portion 23 whose lower portion is opened in a U-shape, a wheel portion 40 having a central axle 42 protruding from both central portions, and an upper surface of the central axle 42. A pair of support bases 36 having a recess 36b to be contacted so as to cover and a protrusion 36a protruding upward, and a pair of elastic bodies S having a restoring force whose lower part is fixed by the protrusion 36a of the support member 36; A pair of support pieces 34, which support both sides of the elastic body S and guide the movement of the central axle 42 up and down, are formed in the length direction, and one side and the bottom of the support piece 34. An outer frame 31 to be covered, a rib 33 formed away from the support piece 34 along the periphery of the outer frame 31, and an opening 23 is slidably provided between the support piece 34 and the rib 33. Car at the bottom A wheel of a student chair having a long wheel idle groove 32 formed so that 40 can project to the outside and a support frame 30 having a contact projection 37 projecting downward at a corner of the bottom surface. FIG.

  When the caster device configured as described above is applied to a chair on which a student or the like sits, when moving the chair, the wheel portion of the caster device can be operated, and the chair can be moved while being pushed, Although the mobility is convenient, when the user sits down, the caster device is not operated by the load of the body, and the body can be prevented from tilting to one side.

However, in the case of the caster device as shown in FIG. 6, the axle supporting the wheel is directly fitted into the long hole provided in the upper body, so that the long hole and the axle hole are added from the axle. The components may be easily worn by the frictional force, and even in the case of the caster device as shown in FIG. 7, the center axle of the wheel is configured to be idled along the wheel idler groove. As a result, there is a possibility that a state in which the wheel idle groove is worn at an early stage due to the central axle that is subjected to a relatively large load compared to other components may occur.
Korea Registered Utility Model Gazette Registration No. 20-0333276

  The present invention was invented to solve the above-mentioned problems, and when a load is applied by improving the structure of a caster device mounted on a moving body such as a chair, a desk, or a furniture body, Provided a caster device equipped with a moving body that limits the rotational movement of the wheel and improves wear resistance by reducing wear between the axle connected to the wheel and its surrounding parts. The purpose is to do.

  According to the present invention, a cover body fixed to a lower part of a movable body such as a chair or a desk, an axle provided on the cover body so as to be movable up and down, wheels connected to both ends of the axle, and the axle A spring is interposed between the cover and the cover so that the axle is elastically supported, and the wheel can rotate when the main body moves in an unloaded state, but when a load is applied to the main body In the caster device configured to be fixed to a support surface, the axle 62 is supported by a moving body 70 accommodated in the cover body 51 so as to be vertically movable, and the axle 62 is fitted. In this way, vertically long pin guide holes 72 for guiding the vertical movement of the cover body 51 are formed on both sides of the axle hole 71 formed through the movable body 70 so as to penetrate the movable body 70 horizontally. In a state where the moving body 70 is incorporated in the cover body 51, a pin 58 is inserted so as to penetrate the pin guide hole 72 through the pin mounting hole 57 formed in the cover body 51. A spring 75 is interposed between the surface and the inner upper surface of the cover body 51 so that the cover body 51 is always pushed upward so that the pin 58 is positioned above the pin guide hole 72; 60 is connected to both sides of the axle 62 via bearings 64. When there is no load acting on the moving body, the cover body 51 is separated from the ground, and the load is applied to the moving body so that the cover body 51 is connected to the pin guide hole 72. When the spring 75 descends while compressing the spring 75 within the range, a fixing plate 54 that is fixed in contact with the ground is provided at the lower portion of the cover body 51.

  Further, the axle hole 71 of the moving body 70 for fitting the axle 62 and the intermediate portion 62a of the axle 62 fitted to the axle hole 71 are formed in a square shape in cross section. It is preferable that the both ends of have a circular cross section.

  Further, it is preferable that the lower end portion of the fixing plate 54 is formed to protrude to the lower portion of the cover body 51.

  According to the present invention configured as described above, the axle that supports the wheel and the wheel idle groove that is the guide means for guiding the vertical movement of the wheel are not formed so as to be directly rubbed. By guiding the vertical movement through another pin and pin guide hole, when the wheel and axle are moved up and down, wear due to friction between the axle and other members is prevented, and A stable vertical movement can be made possible.

  Embodiments of a caster device embodying the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a front view of a caster device embodying the present invention, FIG. 2 is a front sectional view of a caster device embodying the present invention, and FIG. 3 is a side sectional view of a caster device embodying the present invention. FIG. 4 is an exploded perspective view of the caster device, and FIG. 5 is an explanatory diagram of an operational state diagram of the caster device embodying the present invention.

  In the drawings, reference numeral 50 denotes a caster device embodying the present invention. This caster device 50 is mounted on a movable body 100 such as a chair, desk, furniture, etc., and enables the movable body to move.

  In order for the caster device 50 to be attached to the moving body, a supporter hole 52 is formed in the cover body 51 of the caster device 50 so that the lower end of the supporter 53 is fitted. The upper end portion of the supporter 53 whose lower end is fitted in the supporter hole 52 of the cover body 51 is fixedly attached to the main body.

  The cover body 51 includes a main body support portion 51a in which the supporter hole 52 is formed at a predetermined depth, and a wheel support portion 51b that protrudes in an arc shape on one side of the main body support portion 51a to support a wheel. have.

  The lower part of the cover body 51 is configured to be separated from the ground, and, for example, a columnar fixing plate 54 formed so as to be in contact with the ground depending on the action state of the load is detachably attached to the cover body 51, Preferably, it is attached to the lower end of an axle-like main body support 51a on which a load acts.

   The fixing plate 54 is formed in two cylindrical shapes that are divided into an upper part 54 a and a lower part 54 b, and the upper part 54 a is fixedly coupled while being accommodated in an internal space of the cover body 51, and the lower part 54 b is a lower part of the cover body 51. And is fixed to the main body support 51a with a fixing member such as a screw 54c.

  The wheel support portion 51b that is formed to protrude in an arc shape on one side of the main body support portion 51a is formed in a shape having a hollow space so that the inside can accommodate the moving body 70 that supports the axle 62 of the wheel 60. Further, the axles 62 of the wheels 60 pass through the side walls 55 on both sides opposite to both sides of the moving body 70, and an inverted U-shaped axle movement groove 56 for allowing vertical movement passes therethrough. A pin mounting hole 57 for inserting a pin 58, which will be described later, is formed through both sides of the axle movement groove 56.

  On the other hand, the entire shape of the moving body 70 accommodated in the wheel support portion 51b of the cover body 51 is, for example, a rectangular body or a rectangular parallelepiped, and an axle hole 71 for assembling the axle 62 of the wheel 60 described above is formed in the middle. A pin guide hole 72 that allows the moving body 70 to move up and down in a state where the pins 58 are incorporated on both sides of the axle hole 71 is long and has a long hole shape. Is formed.

  In particular, the axle hole 71 in which the axle 62 of the wheel 60 is assembled is preferably formed in a polygonal shape, for example, a square shape, in order to prevent the axle 60 from spinning idle.

  Further, a spring 75 is provided between the movable body 70 and the cover body 51 to apply a force so as to always push the cover body 51 upward while the wheel 60 is supported by the ground. In order to prevent detachment of the spring 75 and set the position, spring mounting projections 73 and 74 are formed to protrude from the movable body 70 and the cover body 51.

  The axle 62 of the wheel 60 incorporated in the axle hole 71 described above has an intermediate 61 a formed in a polygonal shape, for example, a quadrilateral shape in accordance with the cross-sectional shape of the axle hole 71, and is exposed to both sides of the moving body 70. The section is formed in a circular shape so that the wheel 60 can be rotatably mounted.

  When the moving body 70 fitted with the axle 62 is assembled to the cover body 51, both side ends of the axle 62 are exposed to the outside of the axle moving groove 56, and the wheel 60 is attached to the circular cross section 62b thus exposed. Each bearing 64 is incorporated so that it can rotate idly.

The operation state of the caster device configured as described above will be briefly described below.
The caster device 50 embodying the present invention is attached to a leg of a furniture body such as a chair or a desk to facilitate the movement of the moving body 100 or when a load higher than a set level is applied to the moving body 100. Since the main purpose is to prevent the moving body 100 from moving, a description will be given separately when the load is not applied to the moving body 100 and when the load is applied.

  First, when a load is not applied to the moving body 100, the cover body 51 and the fixed plate 54 are in the raised position by the elastic force of the spring 75 with the wheel 60 supported by the ground. The pin guide hole 72 is located on the upper side.

  In this state, when a pressing force is applied to the moving body 100 from one side in the horizontal direction, the wheels 60 that are rotatably mounted on both ends of the axle 62 rotate and move along the direction in which the force acts. Can move freely and move the position of the chair or the like in a desired direction.

  On the other hand, when a person sits down and a load is applied to the moving body 100 after the position of the chair or the like is specified, the cover body 51 descends while compressing the spring 75, whereby the pin 58 is also moved into the pin guide hole. 72 gradually descends.

  In such a process, the fixing plate 54 provided at the lower part of the cover body 51 is also lowered, and when the fixing plate 54 hits the ground and supports the load, the lowering of the cover body 51 stops and the space between the fixing plate 54 and the ground is stopped. Due to the frictional load acting on the wheel 60, the wheel 60 loses its rotational force, and it is possible to prevent a moving body such as a chair from moving arbitrarily while a person is sitting.

The front view of the caster apparatus which implemented this invention. The front sectional view of the caster device which carried out the present invention. The sectional side view of the caster apparatus which implemented this invention. The disassembled perspective view of a caster apparatus. The operation | movement state figure of the caster apparatus which implemented this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. The figure explaining another conventional technique.

Explanation of symbols

50 ... Caster device 51 ... Cover body 51a ... Main body support part 51b ... Wheel support part 52 ... Supporter hole 53 ... Supporter 54 ... Fixing plate 55 ... Side wall 56 ..Axle moving groove 57 ... pin mounting hole 58 ... pin 60 ... wheel 62 ... axle 64 ... bearing 70 ... moving body 71 ... axle hole 72 ... pin guide Hole 73, 74 ... Spring mounting protrusion

Claims (3)

A cover body fixed to a lower part of a moving body such as a chair or a desk, an axle provided on the cover body so as to be vertically movable, wheels connected to both ends of the axle, and between the axle and the cover body Including a spring that is supported so that the axle is elastically supported, the wheel can rotate when the main body moves in an unloaded state, but when the main body is loaded, it is fixed to the support surface In a caster device configured to be
The axle (62) is supported by a moving body (70) accommodated in the cover body (51) so as to be movable up and down, and penetrates the moving body (70) so that the axle (62) is fitted. On both sides of the formed axle hole (71), vertically long pin guide holes (72) for guiding the vertical movement of the cover body (51) are formed through the moving body (70) horizontally, In a state where the movable body (70) is incorporated in the cover body (51), the pin (58) extends through the pin guide hole (72) through the pin mounting hole (57) formed in the cover body (51). ) Is inserted, the cover body (51) is always pushed upward between the upper surface of the movable body (70) and the inner upper surface of the cover body (51), and the pin (58) is pin guide hole. Above (72) The spring (75) which is elastically positioned so as to be located at the position of the wheel (60) is connected to both sides of the axle (62) via bearings (64), and when there is no load acting on the moving body, When the cover body (51) descends while compressing the spring (75) within the range of the pin guide hole (72) when it is separated from the ground and a load is applied to the moving body, it is fixed in contact with the ground. A caster device provided with a moving body, characterized in that a fixed plate (54) is provided at a lower portion of the cover body (51). An axle hole (71) of the moving body (70) for fitting the axle (62) and an intermediate part (62a) of the axle (62) fitted to the axle hole (71) are in cross-sectional shape. The caster device provided with the moving body according to claim 1, wherein both ends of the axle (62) have a circular cross section. The caster device provided with the moving body according to claim 1, wherein a lower end portion of the fixed plate (54) is formed to protrude to a lower portion of the cover body (51).

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