JP5254869B2 - Wheels for caster bags - Google Patents

Description

  The present invention relates to a wheel for a caster bag, and more particularly to a wheel for a caster bag having an enhanced lubrication function and dustproof function.

  Conventionally, caster bags with casters attached to bags have been widely used. Since caster bags are often pulled and carried on the road, the wheels of the casters are exposed to fairly severe conditions. For this reason, if measures for lubrication and dust prevention are not sufficiently taken, the wheel may not function normally due to the lack of grease or dust. As a lubricating method, there is a method of providing a grease reservoir in a wheel or a bearing. As a measure against dust, there is a method of covering a wheel with a dust cover. Below are some examples of prior art related to lubrication and dust-proofing of wheels for caster bags.

  The “caster wheel” disclosed in Patent Document 1 has a good dustproof and soundproofing effect and is easy to assemble. As shown in FIG. 8A, wheel covers are integrally provided on both end faces of the inner sleeve. An outer sleeve is rotatably mounted on the outside of the inner sleeve. There is no gap between the leg and the inner sleeve. No lint is involved. Dust does not enter. Rotation is not hindered and noise is low. Rolling is also reduced. Since the number of parts is small, it is easy to assemble at low cost.

  The “caster with dust-proof cover” disclosed in Patent Document 2 prevents the rotation of the wheel from rotating by preventing dust from entering the connecting portion between the wheel and the axle. As shown in FIG.8 (b), a cylindrical sleeve is attached so that it may protrude on both the left and right sides. Disc-shaped outer covers are provided on both the left and right sides of the wheel. The outer periphery of the outer cover is brought into contact with the inner depression of the tread portion of the wheel. A bearing having a shape that constitutes a side portion of the housing of the bearing is fitted into the outer periphery of both the left and right sides of the sleeve so as to be interposed in a gap formed between the wheel and the external force bar.

  The “caster” disclosed in Patent Document 3 prevents surrounding objects from getting caught in the gap between the support portion and the wheel. As shown in FIG.8 (c), the outer side of the clearance gap between a wheel support part and a wheel is covered. An anti-roll cylinder is provided in the joining gap to prevent the surrounding objects from being caught. The furniture with casters can be used with confidence even in rooms with carpets.

  The “caster with dust-proof cover” disclosed in Patent Document 4 prevents wheel rotation obstacles due to dust. As shown in FIG. 8D, a disc-shaped dustproof cover is provided on the inverted U-shaped gripping portion. Install dust covers on both the left and right sides of the wheel with bushes. The dust cover is fixed to the bush by fixing means provided on the inner side of the dust cover and the outer side of the bush. Since the dust cover does not rotate even when the wheel rotates, lint, hair, and other dust do not get tangled in the axle, and the rotation of the wheel is not hindered.

  The “caster wheel dust-proof structure” disclosed in Patent Document 5 has a hair formed in a gap formed between the inner side surface of each arm and both side end surfaces of the shaft tube so as not to hinder the rotation of the caster wheel. This prevents dust from entering. As shown in FIG. 8E, there are wheels between the pair of left and right arms. A shaft tube is provided at the center of the wheel. Fit rolling bearings on both ends of the shaft tube. A support shaft horizontally supported between both arms is inserted into both roller bearings. A gap is provided between the inner side surface of each arm and each side end surface of the shaft cylinder facing the arm. Enclose the outer periphery of the gap with concealing means so that dust does not enter the gap so that it does not contact the outer peripheral side of both ends of the shaft tube.

  The “caster wheel” disclosed in Patent Document 6 has a very simple configuration, is smooth and reliable in operation, and can prevent an increase in the temperature of the wheel. As shown in FIG. 8F, the hub is provided with an annular protrusion that surrounds the axle through hole, and a hub recess is formed between the hub and the axle. Fit the cap tightly into the hub recess. The cap has a U-shaped cross section, and has a front surface and a peripheral wall perpendicular to the front surface. An axle through hole is provided on the front surface. Fill the hub recess with lubricant. The lubricant flows into the gap between the axle and the axle through hole. Prevents the temperature of the wheels from rising, and the nylon wheels do not stick to the axle.

  The “moving body caster” disclosed in Patent Document 7 is designed to prevent burning due to running out of grease even when traveling for a long distance. As shown in FIG. 8G, the base is fixed to a moving body such as a large suitcase. Attach the wheel to the base hub with rivets by caulking. The wheel rotates with the rivet as the rotation center axis. Tires are provided on the wheels. A plurality of notches are provided at the periphery of the opening on the base side of the center hole of the wheel to form a grease reservoir. Even if you travel a long distance, grease will not run out. The wheels will not burn and the caster will not be damaged.

JP 57-158104 A Japanese Utility Model Publication No. 03-024403 Japanese Utility Model Publication No. 06-033703 JP 09-156303 A JP 2000-185506 A JP 2002-067602 JP JP 2004-142573 A

  However, the conventional lubrication method and dust-proofing method for wheels for caster bags have the following problems. Since the grease is held in the gap between the hub and the axle, a sufficient amount of grease cannot be held, the grease is cut during use, and the wheel cannot rotate normally. In addition, dust and the like enter from the outside between the hub and the axle, increasing the friction, which also impedes normal rotation of the wheels. In the method of covering with the dust cover, the size of the wheel becomes relatively small, and the usability deteriorates.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems and prevent a caster bag wheel from functioning normally for a long period of time by preventing grease from running out and sand from entering and preventing friction from increasing.

  In order to solve the above-described problems, in the present invention, a wheel main body unit integrated with a tire attached to a hub, a disk-shaped part, and a cylindrical part are integrally formed and fixed to the center of the wheel main body part. A caster bag having a grease pack bearing attached to the wheel, an axle for rotatably holding the wheel body via the grease pack bearing, and an axle holding part for fixing and holding the axle fixed to the caster bag body The disk-shaped part of the grease pack bearing of the wheel is provided with a radial grease reservoir and dust-proof means to prevent the ingress of dust and the outflow of grease. The configuration.

  Two grease pack bearings are mounted on both sides of the wheel main body so as to form a hub grease reservoir between the hub and the axle. As dust-proof means, a circumferential rib is provided in the vicinity of the periphery of the disk-shaped part. Further, a dust-proof ring, which is an annular elastic member that does not allow dust to pass through, is fixedly attached to the outer periphery of the disk-shaped portion. A key for fixing to the hub is provided on the cylindrical part of the grease pack bearing.

  By configuring as described above, it is possible to prevent the grease from running out and the intrusion of dust and prevent the increase in friction, and the caster bag wheel can function normally for a long time. In addition, since the grease holding function and the dustproof function are combined with each other, the number of parts is reduced, and the parts cost and assembly cost can be reduced.

It is a perspective view of the rotation part of the wheel for caster bags in the Example of this invention. It is sectional drawing of the rotation part of the wheel for caster bags in the Example of this invention. It is sectional drawing of the state which attached the rotating part of the wheel for caster bags in the Example of this invention to the axle shaft holding part. It is a perspective view of the grease pack bearing of the wheel for caster bags in the Example of this invention. It is a front view of the grease pack bearing of the wheel for caster bags in the Example of this invention. It is a rear view of the grease pack bearing of the wheel for caster bags in the Example of this invention. It is the side view and sectional drawing of the grease pack bearing of the wheel for caster bags in the Example of this invention. It is a conceptual diagram, such as the wheel for the conventional caster bag.

  Hereinafter, the best mode for carrying out the wheel for a caster bag of the present invention will be described in detail with reference to FIGS.

  In an embodiment of the present invention, a grease pack bearing provided with a circumferential rib and a radial grease reservoir is fixed on both sides of the wheel body so as to form a gap serving as a grease reservoir between the hub and the axle. A dust-proof ring is fixedly attached to the outer periphery of the grease pack bearing, the wheel body is rotatably held by the axle via the grease pack bearing, and the axle is fixed by the axle holding part attached to the caster bag body. It is a wheel for a caster bag that is held and the cover portion provided on the axle holding portion is slidably in contact with the rib and the dust-proof ring.

  In FIG. 1, the perspective view of the rotation part of the wheel for caster bags in the Example of this invention is shown. In FIG. 2, sectional drawing of the rotation part of the wheel for caster bags is shown. FIG. 3 is a cross-sectional view showing a state in which a dust-proof ring is attached to the main body of the caster bag wheel. In FIG. 4, the perspective view of the rotation part of the wheel for caster bags is shown. FIG. 5 shows a front view of the grease pack bearing. FIG. 6 shows a rear view of the grease pack bearing. FIG. 7 shows a side view and a sectional view of the grease pack bearing.

  1 to 7, a tire 1 is a ground contact portion of a wheel. The hub 2 is a portion that connects the tire and the axle via a grease pack bearing. The wheel main body 3 is a rotating part integrally with the tire attached to the hub. The grease pack bearing 4 is a bearing that serves both as a bearing, a grease pack, and dust. The dustproof ring 5 is an annular sand shielding member made of elastic felt or rubber. The wheel main body, the grease pack bearing, and the dust-proof ring are rotating parts of the wheel. The axle 6 is a member that rotatably holds the rotating portion of the wheel. The axle holding part 7 is a member that holds the axle fixedly. The radial grease reservoir 8 is a concave portion provided radially on the surface of the disk-shaped portion of the grease pack bearing, and is a portion that holds the grease.

  The rib 9 is a circumferential projection provided near the periphery of the disk-shaped portion, and is a portion that contacts the cover portion. The rib and the dust-proof ring constitute a dust-proof member. The dustproof member may be a rib alone. The cover portion 10 is a disk-like member fixedly attached to the axle or the axle holding portion, and is a member that is slidably in contact with the dust-proof ring. The axle holding part may also serve as the cover part. The hub grease reservoir 11 is a grease reservoir formed between the hub and the axle. The disc-like portion 12 is a flat plate-like portion of the grease pack bearing. The cylindrical portion 13 is a cylindrical portion of the grease pack bearing. The key 14 is a rotation stopper of the grease pack bearing with respect to the hub.

  The function and operation of the wheel for caster bags in the embodiment of the present invention configured as described above will be described. First, an overview of the functions of the caster bag wheels will be described with reference to FIG. A wheel 1 for a caster bag is attached to a hub 2 to be integrated into a wheel body 3. Grease pack bearings 4 are fixedly attached to both sides of the center of the wheel body 3. The grease pack bearing 4 is provided with a radial grease reservoir 8. The wheel body 3 is rotatably held by the axle 6 via the grease pack bearing 4. The axle 6 is fixedly held by the axle holder 7 attached to the caster bag body.

  A dustproof means for preventing the intrusion of dust and the outflow of grease is provided at the periphery of the disk-shaped portion 12 of the grease pack bearing 4. The dustproof means is a circumferential rib 9 provided in the vicinity of the periphery of the disk-shaped part 12 and a dustproof ring 5 fixedly attached to the outer periphery of the disk-shaped part 12. The dust-proof ring 5 is a ring-shaped elastic member that does not pass sand dust such as made of felt. A rubber O-ring may be used, and other materials may be used as long as they have the same elastic sealing function. The axle holding part 7 has a cover part 10 that slides on and contacts both the dust-proof ring 5 and the rib 9. Due to the cover 10, the dust-proof ring 5 and the rib 9, dust and the like cannot enter. Since the radial grease reservoir 8 is also covered with the cover portion 10, the grease does not leak.

  Next, the relationship between the wheel body and the grease pack bearing will be described with reference to FIG. The cylindrical portion 13 of the grease pack bearing 4 is inserted into the center hole of the hub 2. A hub grease reservoir 11 is formed between the hub 2 and the axle 6 between the two grease pack bearings 4. The axle 6 is not in contact with the hub 2. The cylindrical portion 13 of the grease pack bearing 4 functions as a bearing. Since the wheel main body 3 and the bearing are separated and inserted from both sides, it is not necessary to taper the axle 6 and the wheel does not rattle. Further, since the hub grease reservoir 11 can be formed, the grease is not pushed out when the axle 6 is inserted.

  Next, the state where the wheels are attached will be described with reference to FIG. The axle 6 is inserted into the center hole of the cylindrical portion of the grease pack bearing 4. The axle 6 is fixed to the axle holder 7. The axle holding part 7 is fixedly or movably attached to the caster bag body. A cover portion 10 is fixedly attached to the axle holding portion 7 and is in contact with the rib 9 and the dust-proof ring 5. The dust ring 5 and the rib 9 rotate while sliding on the cover portion 10. The cover 10 and the rib 9 prevent the wheels from moving in the axial direction.

  The rib 9 is made as thin as possible within a range in which the mechanical strength of the rib 9 can be maintained so that the friction between the cover portion 10 and the rib 9 is reduced. The cover portion 10 is in light contact with the dust-proof ring 5 so that sand dust does not enter. Since the axle 6 and the grease pack bearing 4 are separated from each other by the dust-proof ring 5 and the cover portion 10, dust and the like do not enter from the outside. Further, the grease does not leak from the radial grease reservoir 8 to the outside.

  The dustproof ring 5 is always in close contact with the cover portion 10 during rotation due to elasticity. The rib 9 is in contact with the cover portion 10, but is not always in close contact depending on the rotational state. Since the rib 9 is not in close contact with the cover portion 10, it is not possible to completely prevent the intrusion of dust and the leakage of grease. However, since only the ribs 9 can prevent the invasion of dust to a certain extent and the leakage of grease can be reduced, only the ribs 9 may be used as the dustproof means. When it is necessary to almost completely prevent the intrusion of dust and the leakage of grease, the dust-proof ring 5 is used in addition to the rib 9 as a dust-proof means.

  Next, the grease pack bearing will be described with reference to FIG. The grease pack bearing 4 includes a disk-shaped portion 12 and a cylindrical portion 13. In the vicinity of the outer peripheral portion of the disk-shaped portion 12, there are circumferential ribs 9. There is a radial grease reservoir 8 around the axis of the disk-shaped portion 12. The grease pack bearing 4 is a member that serves as a bearing, a grease holding portion, and a dustproof portion. Since the wheel body 3 and the grease pack bearing 4 can be made of optimum materials, durability can be enhanced. In addition, since the three functions are combined into one grease pack bearing 4, the dust cover and the grease pack can be made smaller than separately configured.

  Next, the structure of the disk-shaped portion of the grease pack bearing will be described with reference to FIG. In the vicinity of the outer peripheral portion of the disk-shaped portion 12, there are circumferential ribs 9. On the surface of the disk-shaped portion 12 of the grease pack bearing 4, there are radial grooves that serve as radial grease reservoirs 8. The shape and number of the radial grease reservoirs 8 may be determined so as to be optimal according to the use of the wheel. A dust-proof ring 5 is fixedly attached to the outer periphery of the disk-shaped portion 12.

  Next, the structure of the cylindrical portion of the grease pack bearing will be described with reference to FIGS. The cylindrical portion 13 is a portion that serves as a bearing for the wheel main body 3. There is a key 14 on the outer peripheral surface of the cylindrical portion 13 for fitting and fixing to the hub 2. Two of these are attached to both sides of the hub 2. The cylindrical portions 13 of the two grease pack bearings 4 have such a length that a gap is created and does not come into contact with the wheel body 3 so that the gap forms a hub grease reservoir 11. It has become.

  As described above, in the embodiment of the present invention, the caster bag wheel is formed with the grease pack bearing provided with the circumferential rib and the radial grease reservoir, and the gap serving as the grease reservoir is formed between the hub and the axle. As shown in the figure, it is fixedly attached to both sides of the wheel body part, a dust-proof ring is fixedly attached to the outer periphery of the grease pack bearing, and the wheel body part is rotatably held by the axle via the grease pack bearing, and is attached to the caster bag body. Since the axle is fixedly held by the attached axle holder, and the cover provided on the axle holder is in contact with the rib and the dust-proof ring, it is normal for a long period of time to prevent grease breakage and intrusion of dust. Can function.

  The wheel for a caster bag of the present invention is most suitable as a wheel for a caster bag for a travel bag. It is also suitable as a wheel for mounting on baby carriages, shopping carts and other transport vehicles.

DESCRIPTION OF SYMBOLS 1 Tire 2 Hub 3 Wheel main-body part 4 Grease pack bearing 5 Dust-proof ring 6 Axle 7 Axle holding part 8 Radial grease reservoir 9 Rib
10 Cover section
11 Hub grease reservoir
12 Disc-shaped part
13 Cylindrical part
14 key

Claims (5)

A wheel main body unit in which a tire is attached to a hub, a grease pack bearing in which a disk-shaped part and a cylindrical part are integrally configured and fixedly attached to the center of the wheel main body part, and the grease pack bearing A wheel for a caster bag, comprising: an axle that rotatably holds the wheel body via a wheel; and an axle holder that is attached to the caster bag and holds the axle fixedly, the grease pack bearing The disc-shaped portion is provided with a radial grease reservoir, dust-proof means for preventing sand intrusion and grease outflow, and a cover portion slidably in contact with the dust-proof means is provided on the axle holding portion. Wheels for caster bags. 2. The wheel for a caster bag according to claim 1, wherein two grease pack bearings are attached to both sides of the wheel main body so as to form a hub grease reservoir between the hub and the axle. 2. The wheel for a caster bag according to claim 1, wherein a circumferential rib is provided in the vicinity of the periphery of the disk-shaped portion as the dust-proof means. As the dust-proof means, a circumferential rib is provided in the vicinity of the periphery of the disk-shaped part, and a dust-proof ring, which is an annular elastic member that does not allow dust to pass through, is fixedly attached to the outer periphery of the disk-shaped part. The wheel for a caster bag according to claim 1. The wheel for a caster bag according to claim 1, wherein a key for fixing to the hub is provided on a cylindrical portion of the grease pack bearing.

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