JP5365791B2 - caster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caster that prevents to release a radial bearing from a body frame and excels in durability even if the caster is heavily lorded in the case of the radial bearing is insert-molded with the body frame made of a synthetic resin and hold by the body frame. <P>SOLUTION: The caster includes a support shaft 1, a body frame 3 made of a synthetic resin insert-molded a radial bearing 2 rotatably supporting the support shaft 1, and a wheel 4 pivotally supported by the body frame 3. A shaft hole 7, which inserts the support shaft 1 at the center of a turning part 5 of the body frame 3 by shifting in the front-and-rear direction the pivot S<SB>1</SB>of the support shaft 1 and the pivot S<SB>2</SB>of the wheel 4, is formed penetrating vertically. The radial bearing 2 is provided in which an outer ring 2a is formed thicker than an inner ring 2b, and substantially the entire portion of upper and lower parts of the outer ring 2a is insert-molded with the body frame 3 to be embedded therein and hold by the inner circumferential part of the shaft hole 7, and further the inner ring 2b is firmly fixed to the support shaft 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a shopping cart used in a supermarket or the like, a transport machine used in a factory premises, or a caster attached to a wheelchair, a stroller, other transport vehicles, or the like.

Conventionally, when the structure of this type of caster is illustrated, for example, as shown in FIG. 10, a support shaft 11 that is supported by a mounted body such as the transport vehicle, and the support shaft 11 are provided. There is one provided with a main body frame 13 made of synthetic resin in which a radial bearing 12 to be bearing is insert-molded and a wheel 14 pivotally supported on the main body frame 13. As shown in the figure, this type of caster is configured so that the wheel 14 is shifted in the front-rear direction (the left-right direction in FIG. 10) with respect to the shaft support point S _{1 of the} support shaft 11 and the shaft support point S ₂ of the wheel 14. It makes it easy to turn (Patent Document 1, Patent Document 2).

  The main body frame 13 is formed in a substantially downward U-shape, and support pieces 16 of the wheels 14 are extended downward at left and right ends of the swivel portion 15 arranged substantially horizontally. A shaft hole 17 into which the support shaft 11 is inserted is formed in the center of the turning portion 15 so as to penetrate in the vertical direction. In the radial bearing 12, an outer ring 12a is held on the inner peripheral portion of the shaft hole 17 by insert molding, and an inner ring 12b is fixed to the support shaft 11.

JP 2002-347408 A Utility Model Registration No. 3141203

  However, in the conventional caster, although the outer ring 12a of the radial bearing 12 is held by the inner peripheral part of the shaft hole 17 of the turning part 15 of the main body frame 13 by insert molding, the outer ring 12a Since the thickness of the outer ring 12a is formed to be approximately the same as the thickness of the inner ring 12b and is measured to be as thin as about 2 to 3 mm, when the outer ring 12a is held by insert molding, a small width (measured Only about 1-2 mm width).

However, in the conventional caster, in order to turn the wheel 14, the shaft support point S _{1 of the} support shaft 11 and the shaft support point S _{2 of the} wheel 14 are shifted in the front-rear direction. When a load such as a transport vehicle is applied, the front lower portion (point A shown in FIG. 10) of the inner peripheral portion of the shaft hole 17 and the rear upper portion (point B shown in FIG. 10) of the inner peripheral portion of the shaft hole 17 are large. Since a load is applied, as shown in FIG. 11, there is a problem that the outer ring 12 a of the radial bearing 12 may come off from the main body frame 13.

  Therefore, the present invention has an object to solve the above-mentioned conventional problems, and even when a radial load is held by insert molding on a synthetic resin main body frame, a large load is applied to the caster. The purpose of the present invention is to provide a caster that is difficult to come off from the main body frame and has excellent durability.

Therefore, the caster according to the present invention includes a main body frame 3 made of synthetic resin in which a support shaft 1 and a radial bearing 2 that supports the support shaft 1 are insert-molded, and a wheel 4 that is supported by the main body frame 3. A shaft hole in which the support shaft 1 is inserted into the center of the swivel portion 5 of the main body frame 3 by shifting the support shaft S _{1 of the} support shaft 1 and the support shaft S _{2 of the} wheel 4 in the front-rear direction. 7 is formed so as to penetrate in the vertical direction, and the radial bearing 2 is formed so that the outer ring 2a is thicker than the inner ring 2b, and the upper and lower parts of the outer ring 2a are embedded in the main body frame 3. The inner ring 2b is fixed to the support shaft 1 by being molded and held on the inner peripheral portion of the shaft hole 7.

The caster according to the present invention includes a support frame 1, a synthetic resin-made main body frame 3 in which a radial bearing 2 that supports the support shaft 1 is insert-molded, and a wheel 4 that is supported by the main body frame 3. A shaft hole in which the support shaft 1 is inserted into the center of the swivel portion 5 of the main body frame 3 by shifting the support shaft S _{1 of the} support shaft 1 and the support shaft S _{2 of the} wheel 4 in the front-rear direction. 7, the radial bearing 2 is formed so that the outer ring 2a is thicker than the inner ring 2b, and the outer ring 2a is substantially entirely embedded in the main body frame 3 at the front upper part. Of the shaft hole 7 is formed by insert molding so that substantially the entire rear upper part is embedded in the main body frame 3 and part of the rear lower part is embedded in the main body frame 3. Is held by the inner periphery of the Further, the inner ring 2b is fixed to the support shaft 1.

  Further, in the caster according to the present invention, the thickness Ta of the outer ring 2a is set to be 1.5 times or more the thickness Tb of the inner ring 2b.

  Further, in the caster of the present invention, when the thickness Tb of the inner ring 2b is set to 1 to 3 mm by actual measurement, the thickness Ta of the outer ring 2a is set to 2 to 6 mm or more by actual measurement.

  The caster of the present invention is configured as described above, and when the radial bearing is insert-molded and held on the synthetic resin main body frame, the radial bearing is not affected even if a large load is applied to the caster. It became difficult to come off from the main body frame, and it was excellent in durability.

It is a side view of 1st embodiment of the caster of this invention. It is a front view of the caster of this invention shown in FIG. It is a top view of the caster of this invention shown in FIG. It is a partial cross section side view of the caster of this invention shown in FIG. It is a partial cross section side view of 2nd embodiment of the caster of this invention. It is a partial cross section side view of 3rd embodiment of the caster of this invention. It is a partial cross section side view of 4th embodiment of the caster of this invention. It is a partial cross section side view of 5th embodiment of the caster of this invention. The radial bearing of the caster of this invention is shown, (a) is 1st, 2 embodiment, (b) is 3rd embodiment, (c) is 4th embodiment, (d) is 5th embodiment, It is a half sectional view of each radial bearing. It is a partial cross section side view of the conventional caster. It is a partial cross section side view which shows the use condition of the conventional caster.

  Embodiments of casters according to the present invention will be described below in detail with reference to the drawings.

  As shown in FIGS. 1 to 8, the caster of the present invention is made of synthetic resin in which a support shaft 1 that is supported by a mounted body such as a transport vehicle and a radial bearing 2 that supports the support shaft 1 are insert-molded. The main body frame 3 and wheels 4 pivotally supported on the main body frame 3 are provided.

And the caster of this invention makes it easy for the wheel 4 to turn, assuming that the shaft support point S _{1 of the} support shaft 1 and the shaft support point S ₂ of the wheel 4 are shifted in the front-rear direction (left-right direction in FIG. 1). I have to. The radial bearing 2 is preferably a ball bearing, particularly a deep groove ball groove receiver.

  As shown in FIG. 2, the main body frame 3 is formed in a substantially U-shape that faces downward, and the support pieces 6 of the wheels 4 are disposed at the left and right ends of the swiveling unit 5 that are arranged substantially horizontally. It is assumed that a shaft hole 7 into which the support shaft 1 is inserted is formed in the center of the revolving part 5 so as to penetrate in the vertical direction.

  As shown in FIGS. 4 and 9A, the radial bearing 2 is formed such that the thickness Ta of the outer ring 2a having a flat cylindrical shape is thicker than the thickness Tb of the inner ring 2b having a flat cylindrical shape. Has been. The radial bearing 2 is insert-molded so that substantially the entire upper and lower surfaces of the outer ring 2 a are embedded in the main body frame 3, and is held on the inner peripheral portion of the shaft hole 7. Further, in the radial bearing 2, the support shaft 1 is inserted into the inner ring 2b, an intermediate portion of the support shaft 1 is fastened to the upper portion of the inner ring 2b with a nut 8, and the lower portion of the support shaft 1 is interposed under the inner ring 2b with a washer 9. The inner ring 2b is fixed to the support shaft 1 by caulking.

  Further, as shown in FIGS. 5 and 6, the radial bearing 2 is formed such that the thickness Ta of the outer ring 2a having a flat cylindrical shape is thicker than the thickness Tb of the inner ring 2b having a flat cylindrical shape. Yes. In the radial bearing 2, the outer ring 2a has a substantially entire front lower surface embedded in the main body frame 3, and a part of the front upper surface, preferably approximately half of the outer ring 2a, is embedded in the main body frame 3 and substantially the entire rear upper surface. Is embedded in the main body frame 3 and is insert-molded so that a part of the rear lower surface, preferably approximately half, is embedded in the main body frame 3, and is held on the inner peripheral portion of the shaft hole 7. Further, in the radial bearing 2, the support shaft 1 is inserted into the inner ring 2b, an intermediate portion of the support shaft 1 is fastened to the upper portion of the inner ring 2b with a nut 8, and the lower portion of the support shaft 1 is interposed under the inner ring 2b with a washer 9. The inner ring 2b is fixed to the support shaft 1 by caulking. As shown in FIG. 9A, the thickness Ta of the outer ring 2a is such that the outer ring 2a itself is thicker than the thickness Tb of the inner ring 2b from the beginning, or as shown in FIG. 9B. In addition, another outer ring can be wound around the outer periphery of the outer ring 2a to make it thicker than the thickness Tb of the inner ring 2b. 9B is insert-molded so that substantially the entire upper and lower surfaces of the outer ring 2a are embedded in the main body frame 3, and is held by the inner peripheral portion of the shaft hole 7. It can also be.

  Further, as shown in FIGS. 7 and 9C, the radial bearing 2 has an inner ring 2b in which the thickness Tc of only the lower peripheral end portion of the outer ring 2a having a flat cylindrical shape is formed into a flat cylindrical shape. It is formed thicker than the thickness Tb. The radial bearing 2 is insert-molded so that substantially the entire upper and lower surfaces of the outer ring 2 a are embedded in the main body frame 3, and is held on the inner peripheral portion of the shaft hole 7. Further, in the radial bearing 2, the support shaft 1 is inserted into the inner ring 2b, an intermediate portion of the support shaft 1 is fastened to the upper portion of the inner ring 2b with a nut 8, and the lower portion of the support shaft 1 is interposed under the inner ring 2b with a washer 9. The inner ring 2b is fixed to the support shaft 1 by caulking.

  Further, as shown in FIGS. 8 and 9 (d), the radial bearing 2 has a thickness Td of only the middle portion of the outer ring 2a having a flat cylindrical shape, and the thickness of the inner ring 2b having a flat cylindrical shape. It is formed thicker than the thickness Tb. In the radial bearing 2, the outer ring 2a is embedded in the main body frame 3 at substantially the entire front surface and middle portion thereof, and a part of the front upper surface, preferably approximately half, is embedded in the main body frame 3, and the rear upper surface. Are inserted and molded so that a part of the rear lower surface, preferably approximately half, is embedded in the main body frame 3 and held in the inner peripheral portion of the shaft hole 7. ing. Further, in the radial bearing 2, the support shaft 1 is inserted into the inner ring 2b, an intermediate portion of the support shaft 1 is fastened to the upper portion of the inner ring 2b with a nut 8, and the lower portion of the support shaft 1 is interposed under the inner ring 2b with a washer 9. The inner ring 2b is fixed to the support shaft 1 by caulking. The thickness Td of the intermediate portion of the outer ring 2a is made thicker than the thickness Tb of the inner ring 2b by winding another outer ring having a thickened intermediate portion around the outer periphery of the outer ring 2a. The intermediate portion may be thicker than the thickness Tb of the inner ring 2b from the beginning. Further, even in the case shown in FIG. 8, insert molding is performed so that substantially the entire upper and lower surfaces of the outer ring 2 a are embedded in the main body frame 3, and the inner ring is held on the inner peripheral portion of the shaft hole 7. 2b may be fixed to the spindle 1.

  Further, in the caster according to the present invention, in the one shown in FIGS. 5, 6, and 8, the intermediate portion between the front lower surface and the rear lower surface of the outer ring 2a is almost entirely from the front to the rear. It is embedded in the main body frame 3 so as to gradually approach a part (substantially half), and a part (substantially half) of the intermediate part between the front upper surface and the rear upper surface as it goes from the front to the rear. ) Is gradually embedded in the main body frame 3 so as to approach substantially the whole, but the intermediate portion may be embedded in the main body frame 3 in any way, and in some cases, the intermediate portion may be It is good also as what is not embed | buried under the main body frame 3 at all.

  In the caster according to the present invention, the radial bearing 2 is formed such that the thickness Ta of the outer ring 2a is equal to the thickness Tb of the inner ring 2b in order to make the thickness Ta of the outer ring 2a thicker than the thickness Tb of the inner ring 2b. The thickness is preferably 1.5 times or more, more preferably 2.0 times or more. That is, in the caster of the present invention, when the thickness Tb of the inner ring 2b is measured to 1 to 3 mm, the thickness Ta of the outer ring 2a can be set to 2 to 6 mm or more by actual measurement. In the caster of the present invention, even when the thickness Tc of the lower peripheral end portion of the outer ring 2a and the thickness Td of the intermediate portion of the radial bearing 2 are each made thicker than the thickness Tb of the inner ring 2b, these The thicknesses Tc and Td of the inner ring 2b are preferably 1.5 times or more thicker than the thickness Tb of the inner ring 2b, more preferably 2.0 times or more. That is, in the caster according to the present invention, when the thickness Tb of the inner ring 2b is measured to be 1 to 3 mm, the thicknesses Tc and Td can be set to 2 to 6 mm or more, respectively.

  The caster of the present invention is configured as described above, and in the one shown in FIGS. 4 and 7, a load such as a carriage is applied to the support shaft 1, and the front lower portion A of the inner peripheral portion of the shaft hole 7 and Even when a large load is applied to the rear upper part B of the inner peripheral part of the shaft hole 7, insert molding is performed so that substantially the entire upper and lower peripheral surface or lower peripheral surface of the outer ring 2 a thicker than the inner ring 2 b is embedded in the main body frame 3. And since it is hold | maintained at the inner peripheral part of the shaft hole 7, the holding force is increased and the outer ring | wheel 2a of the radial bearing 2 does not remove | deviate from these parts.

  Further, in the caster of the present invention, in the case shown in FIGS. 5, 6, and 8, a load such as a carriage is applied to the support shaft 1, and the front lower portion A of the inner peripheral portion of the shaft hole 7 and the shaft hole 7 Even when a large load is applied to the rear upper part B of the inner peripheral part of the inner ring 2, substantially the entire front lower surface of the outer ring 2 a thicker than the inner ring 2 b is embedded in the main body frame 3, and substantially the entire rear upper surface is embedded in the main body frame 3. Since it is insert-molded and held on the inner peripheral portion of the shaft hole 7, the holding force is increased, and the outer ring 2a of the radial bearing 2 does not come off from these portions. In this case, a part (substantially half) of the front upper surface of the outer ring 2a thicker than the inner ring 2b is embedded in the main body frame 3, and a part (substantially half) of the rear lower surface is embedded in the main body frame 3. The outer ring 2a of the radial bearing 2 is also removed from these portions because a large load is not applied to these portions. There is no such thing. Rather, by doing in this way, the usage-amount of the synthetic resin used for the main body flame | frame 3 is reduced, it leads also to a cost reduction, and becomes more preferable.

DESCRIPTION OF SYMBOLS 1 Support shaft 2 Radial bearing 2a Outer ring 2b Inner ring 3 Main body frame 4 Wheel 5 Turning part 7 Shaft hole S ₁ axis support point S ₂ axis support point Ta Thickness Tb Thickness

Claims (4)

A main body frame (3) made of synthetic resin in which a support shaft (1) and a radial bearing (2) for bearing the support shaft (1) are insert-molded, and the main body frame (3) are supported. A wheel (4), and the pivot (S ₁ ) of the pivot ( ₁ ) and the pivot (S ₂ ) of the wheel (4) are shifted in the front-rear direction to turn the main frame (3). It is assumed that a shaft hole (7) into which the support shaft (1) is inserted is formed in the center of the portion (5) so as to penetrate in the vertical direction, and the radial bearing (2) has an outer ring (2a) as an inner ring (2b). The outer ring (2a) is formed by insert molding so that substantially the entire upper and lower parts of the outer ring (2a) are embedded in the main body frame (3), and is held on the inner periphery of the shaft hole (7). A caster characterized in that an inner ring (2b) is fixed to the support shaft (1). A main body frame (3) made of synthetic resin in which a support shaft (1) and a radial bearing (2) for bearing the support shaft (1) are insert-molded, and the main body frame (3) are supported. A wheel (4), and the pivot (S ₁ ) of the pivot ( ₁ ) and the pivot (S ₂ ) of the wheel (4) are shifted in the front-rear direction to turn the main frame (3). It is assumed that a shaft hole (7) into which the support shaft (1) is inserted is formed in the center of the portion (5) so as to penetrate in the vertical direction, and the radial bearing (2) has an outer ring (2a) as an inner ring (2b). The outer ring (2a) is substantially thicker at the front lower part, embedded in the main body frame (3), part of the front upper part is embedded in the main body frame (3), and substantially at the rear upper part. Is embedded in the main body frame (3), and a part of the rear lower part is embedded in the main body frame (3). Uni insert molded, is held in the inner periphery of the shaft hole (7), further wherein the inner ring (2b), characterized in that fixed to the support shaft (1) caster.   The caster according to claim 1 or 2, wherein the thickness (Ta) of the outer ring (2a) is 1.5 times or more the thickness (Tb) of the inner ring (2b).   The thickness (Ta) of the outer ring (2a) is set to 2 to 6 mm or more by actual measurement when the thickness (Tb) of the inner ring (2b) is set to 1 to 3 mm by actual measurement. The caster described.

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