JP3064780U - Telescopic wheel device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention is to develop a new wheel device that can be attached in a state that is strong and aesthetically excellent while eliminating screw fastening when attaching to an attachment member side such as a chair. The task was to do. SOLUTION: The fitting type wheel device A of the present invention includes a casing 1 formed of resin and a wheel unit 2 held by the casing 1, and the casing 1 is formed on a mounting member side. A casing used in a state in which the casing 1 fits into a fitting hole having an arc surface adapted to the router cone, and the casing 1 has a shape that substantially closes the opening of the fitting hole on the opening side of the fitting hole; 1
The base portion 15B is positioned upward on the torso portion 14 side of the
A locking claw 15 with C downward is formed between the torso surface 14A through a slit 16, and the slit dimension D is a dimension between the free end 15C of the locking claw 15 and the upper end of the casing 1. It is not less than 50% of a certain free end dimension L.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a fitting-type wheel device which is suitable for use in, for example, facilitating movement of a chair or the like.

[0002]

[Background of the invention]

 Conventionally, a mechanism has been used which makes it easy to move a chair, for example, by attaching a wheel device to a chair leg. For example, a wheel device is placed beneath the leg, or the bottom of the leg is carved by router processing or the like to form a fitting hole, and the wheel device is mounted here so as to be fitted, or And the like, on which caster wheels facing the vehicle are mounted. Among these, for example, a fitting type wheel device disclosed in, for example, Japanese Patent No. 2511730, which is used by fitting it into a fitting hole formed in the grounding surface of a wooden chair leg, has a certainty of mounting and operation. It is widely used for its stability and safety.

[0003] However, the present applicant is not satisfied with such market evaluation, and has been working on the development of a novel mechanism that responds to demands from the manufacturing side such as labor saving in a chair manufacturing process. It was found that there was room for improvement in the method in screw fastening work. By the way, it is considered technically common to attach a wheel device with a screw when it is mounted on a wooden chair of this type in the past, and there is room for improvement, especially for eliminating the mounting screws. There was no idea at all.

Of course, in the case of a door wheel used as a sliding door that reciprocates on a regulated rail, the load at the time of use is small, the operating conditions are stabilized, and the mounting mode of the wheel device is almost always ignored. It is only necessary to obtain a mounting state that does not cause any dropout and does not fall off. Therefore, a structure having a structure that can eliminate the screwing has been proposed (Japanese Utility Model Laid-Open No. 7-410958). However, in a chair or the like that is forced to move irregularly and changes greatly in load between use and non-use, such a simple structure cannot be practically endured. Met. In addition, the chair may be handled in such a way that it is turned upside down when temporarily cleared, but the lower surface will be visible at that time, but in the case of the prior art, it is just a door wheel. For this reason, it is not considered that the user is silent in the mounted state, and if this prior art is applied to a chair, consumers cannot be aesthetically satisfactory.

[0005]

[Technical issues that we attempted to develop]

 The present invention has been made in view of such a background, and when attaching to a mounting member side of a chair or the like, it is possible to remove the screw fastening but to attach it in a strong and aesthetically superior state. This was an attempt to develop a simple wheel device.

[0006]

[Means for Solving the Problems]

 That is, the fitting type wheel device according to the first aspect includes a casing formed of a resin and a wheel unit held by the casing, and the casing is adapted to the router cone formed on the mounting member side. In a member used to fit in a fitting hole having an arcuate surface, the casing has a shape that substantially closes the opening of the fitting hole on the opening side of the fitting hole, and that the casing has a shape close to the waist portion of the casing. Is formed with a slit between the free end 15C and the upper end of the casing by forming a locking claw with the base part upward and the free end 15C down, between the torso surfaces. It is characterized in that it is at least 50% of the free end dimension which is the dimension. According to the present invention, when the fitting-type wheel device is mounted on a mounting member such as a chair, it is possible to perform mounting with screws and the like eliminated by almost one-touch operation.

[0007]

[Embodiment of the invention]

 Hereinafter, the present invention will be specifically described based on the illustrated embodiments. The embodiment shown in FIGS. 1 to 6 is an embodiment which is excellent in terms of production cost, ease of use, and the like as a whole, and this fitting type wheel device A is roughly divided into a casing 1 and a wheel unit 2 and is mounted. It is used by being attached to a chair 3 as a member. In describing the movement, direction, and direction of the fitting type wheel device A, the rolling direction of the wheel is defined as the longitudinal direction, the direction perpendicular to the rolling direction is defined as the thickness direction, and the ground contact side of the wheel is defined as the upper side. .

[0010] Hereinafter, the fitted wheel device A will be described in detail. As an example, when the fitted wheel device A is mounted on the chair 3, the wheel 20 is in a protruding state when the chair 3 is in a no-load state. To move the chair 3 easily, while the wheel 20 is immersed in the casing 1 when the person sits on the chair 3 so that the chair 3 is not moved. The wheel device is applied. Needless to say, the present invention can be applied to a fixed type in which the wheels 20 do not come and go.

First, a casing 1 which is an outer shell member is formed by molding a synthetic resin material by injection molding or the like, and has a body portion 10 having a hollow interior so as to accommodate the wheel unit 2. A flange 11 is provided below the body 10 so as to project in the longitudinal direction of the wheel. The inside of the torso 10 is a hollow wheel unit receiving portion 12, the flat portion of the outer surface of the torso 10 is a torso flush surface 13, and both ends of the torso 10 in the longitudinal direction are torso. It is referred to as part 14. Each of the tongues 14 has a locking claw 15, and the locking claw 15 is formed as an integral member with the torso 10. It is formed integrally with the body 10 at the upper base 15B, and the lower free end 15C is formed in a flared shape in a free state.

[0010] Further, the locking claw 15 is formed with a plurality of inverted claw-shaped claw pieces 15A extending upward from the free end 15C side, and the flat surface of the locking claw 15 including the claw pieces 15A. The shape of the leading edge in the direction is substantially arc-shaped. Incidentally, this arc-shaped shape is because the fitting hole 35 on the side of the chair 3 is usually processed by a router when it is attached to the chair 3, so that the shape conforms to the cut shape of the router cone. Of course, the shape of the tip edge of the locking claw 15 or the claw piece 15A does not necessarily have to be arcuate as long as it can be fitted into the fitting hole 35. The slit 16 is formed so as to be expanded in an arc shape toward the locking claw 15 at the upper end portion to form a stress dispersion portion 16A. To further describe the dimensional relationship between the locking claw 15 and the slit 16, the dimension between the free end 15C of the locking claw 15 and the upper end surface of the casing 1 is defined as a free end dimension L, and the height dimension of the slit is defined as Assuming that D is the dimensional ratio, D / L is about 80% or more in this embodiment, and this dimensional setting is the most preferable dimension. However, this dimension is basically about 50% or more. It is preferable to take it.

Although the lower end (free end 15 C) of the locking claw 15 extends near the flange 11, it does not reach the upper surface of the flange 11 completely in this embodiment, and as a result, the body Below the wife portion 14, a wife step 14B is formed. For example, the wedge portion step 14B has an arc-shaped planar projection shape, and the arc diameter is formed substantially equal to the width of the body portion.

Next, a description will be given of a flange 11 that is integral with the body 10 and that extends below the wheel 20 in the longitudinal direction of the wheel 20. The projecting end of the flange 11 has an arc-shaped planar projection having a diameter equal to the width of the body portion 10. Further, a screw receiving portion 11A is formed in the overhanging portion in consideration of receiving the screw 5. You. As shown in FIG. 4A, for example, the screw receiving portion 11A is in a weakened state in which the thickness of the flange 11 is partially reduced so that a separate drilling operation is not required for receiving the screw 5. It is composed. If the screw receiving portion 11A is vacant or has a simple concave shape, when the user looks at the hole, it is expected that the user will misunderstand that the screw 5 has been forgotten or dropped. In order to prevent this, it is preferable to form the screw pattern 11B.

The wheel unit receiving portion 12 side of the body 10 will be described. Here, a structure for receiving the wheel unit 2 is provided. First, the body of the wheel unit receiving portion 12 is provided. Slide guides 17 are formed in two rows on each surface inside the flash surface 13. One of the slide guides 17 is formed in an elongated hole shape penetrating the body flash surface 13, and the lower end of the elongated hole functions as a stopper 17 </ b> A for preventing the wheel unit 2 from falling off. Further, a spring accommodating portion 18 for accommodating the spring S is formed also as a rib-like member for forming the slide guide 17. By forming the spring storage portion 18, the spring S can maintain a self-standing posture at the time of assembly, and the assembly can be easily performed.

Next, the wheel unit 2 supported on the casing 1 will be described. This is composed of, for example, a synthetic resin wheel 20, a metal axle 21 and a bearing frame 22 as an example. The bearing frame 22 is formed in a gate shape when viewed from the longitudinal direction. The upper part of the gate shape is defined as an upper frame 23, and both side surfaces are defined as side frames 24. A bearing hole 25 for receiving the axle 21 is formed in the side frame 24, and a pair of knocking pieces 26 at each of the four sides are formed so as to protrude outward. In such an assembly of the casing 1 and the wheel unit 2, the spring S is stored vertically in the spring storage portion 18 of the wheel unit receiving portion 12 of the casing 1, and the spring S is stored in the opening side of the wheel unit receiving portion 12. The user pushes the wheel unit 2 after applying it. In this case, the wheel unit 2 enters while being guided by the slide guide 17, and at the time when the knocking piece 26 exceeds the stopper 17A, the falling off state is prevented, and the assembly is performed at once. is there.

Next, a description will be given of the chair 3 that receives such a fitting type wheel device A. The chair 3 can take various forms having a function as a chair. For example, the chair 3 shown in FIG. 1 has a leg 31, a seat surface 32, and a backrest 33. An insertion hole 35 into which the insertion type wheel device 1 is inserted is formed. This fitting hole 35 is formed by router processing in many cases in an actual manufacturing process. For example, when the fitting type wheel device A has a body 10 and a flange 11, A deeply formed body fitting portion 35A and a shallowly formed flange fitting portion 35B are formed in two stages. The engraved shape of each end is formed in an arc shape, which is an arc surface that conforms to the router cone provided by the processing shape of the router cone.

When the fitting wheel device A is attached to such a chair 3, the upper part of the casing 1 of the fitting wheel device A is pressed into the fitting hole 35, and then pushed. You just need to At this time, the locking claw 15 is guided by the flange fitting portion 35B while resisting the tendency to protrude, and is pressed in while shrinking the flared shape. However, when the fitting type wheel device A is pushed in because it has an elastic tendency to protrude, the locking claw 15 is maintained in a state of biting in the longitudinal direction of the fitting hole 35 and is formed in a reverse claw shape. The locking claw 15 completely prevents the return in the exit direction. In such a state, the mounting state of the flange 11 is almost the same as that of the conventional type, with this portion fitted in the flange fitting portion 35B.

Incidentally, at this time, the flange 11 is formed with a screw receiving portion 11A so as to be able to respond to a case where there is a request to further increase the reliability of the mounting. If it is screwed in, it will be fixed by the screw 5. Incidentally, when the screw 5 is fitted into the screw receiving portion 11A, for example, if an electric driver or the like is used, the screw 5 rotates at an extremely high speed, and the material is somewhat softened by the contact heat between the screw 5 and the flange 11. In this embodiment, the screws 5 are bonded as if they were adhered, and the effect of preventing the screws 5 from coming off is further enhanced. On the other hand, if the screw 5 is not used, and if this portion is made to be a hole, the consumer misunderstands aesthetically as if the user forgets to tighten the screw 5, and raises doubts regarding the reliability of the product. Therefore, when the screw pattern 11B is formed in this portion as described above, the screw pattern 11B is visually observed in an extremely natural state, and there is no possibility that the above-described misperception occurs.

[0018]

[Effect of the invention]

 The present invention has the structure as described above. When the fitting-type wheel device A is mounted on the chair 3 or the like, it can be mounted with one touch and the mounting strength is sufficiently strong. Although the present invention has been described by taking the chair 3 as an example of a member to be attached, the present invention can be applied to a chair, a suitable wagon table and other furniture. It is of course possible to use it when it is installed in such a way that it functions as a roller that facilitates movement of various works during work.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fitting type wheel device of the present invention and a chair using the same.

FIG. 2 is an exploded perspective view showing an example of the fitted wheel device of the present invention.

FIG. 3 is a front view (a), a right side view (b), a plan view (c), a bottom view (d), and a rear view (e) of the same.

FIG. 4 is a cross-sectional view (a) viewed from the direction of the arrows AA, FIG. 4 (b), and a cross-sectional view (c) viewed from the direction of the arrows CC. ).

FIG. 5 is a cross-sectional view showing only the casing as viewed from the direction of the arrow line DD in FIG.

FIG. 6 is an explanatory view showing a state in which the fitting wheel device is attached to a chair.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Wheel unit 3 Chair 5 Screw 10 Body 11 Flange 11A Screw receiving part 11B Screw pattern 12 Wheel unit receiving part 13 Body flash surface 14 Body wrist part 14A Body wrist surface 14B Wife step 15 Locking nail 15A Nail piece 15B Base 15C Free end 16 Slit 16A Stress dispersing part 17 Slide guide 17A Stopper 18 Spring storing part 20 Wheel 21 Axle 22 Bearing frame 23 Top frame 24 Side frame 25 Bearing hole 26 Knock piece 31 Leg 32 Seat surface 33 Backrest 35 Fitting Hole 35A Body fitting part 35B Flange fitting part A Fitting type wheel device D Height dimension (of slit) L Free end dimension S Spring

Claims (1)

[Utility model registration claims] 1. A casing formed by molding a resin, and a wheel unit held by the casing, wherein the casing has a fitting hole having an arcuate surface adapted to a router cone formed on a mounting member side. In the member used in the state of being accommodated, the casing is located on the opening side of the fitting hole,
A locking claw having a shape that substantially closes the opening of the fitting hole, and a base portion facing upward on the trunk side of the casing and a free end facing downward is formed through a slit between the trunk sides. And the slit dimension is at least 50% of the free end dimension between the free end of the locking claw and the upper end of the casing.