JPH10193908A - Caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pin member from being pulled out by a wheel without causing any trouble in rotation of the wheel by providing a braking means for braking a front wheel and supporting one end of a pin member for supporting the braking means so as to prevent it from being pulled out by internal end face of the wheel. SOLUTION: A vertical wall 12 having a triangle shape in a side view and a prescribed thickness which is separated from a partition wall 3 is integrally formed in the bottom central part in the top area of a wheel cover 2 and a brake metal 15 as a braking means is swingingly pivoted to a shaft hole 13 bored in the vertical wall 12 via a metal pin member 14 with a head part 14a. The outer end face of the head part 14a in the pin member 14 is so supported as to be prevented from pulled out by the inner end face of an inner gear 11 in one wheel 7. One end of the pin member 14 for swingingly pivoting the braking means is thus supported so as to be prevented from being pulled out by the end face of the wheel so that the pin member 14 can be prevented from being pulled-out by the wheel 7 without causing any trouble in the rotation of the wheel 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The present invention relates to a chair,
The present invention relates to a caster such as a twin-wheel free wheel with a stopper, which is used by being attached to a lower part of an object such as a desk or a device.

2. Description of the Related Art Conventionally, as the caster of the above-mentioned example, there is a caster having the following structure, for example. That is, the left and right wheels are rotatably mounted on a main body composed of a wheel cover and a partition wall using wheels, and an inner gear for braking is integrally formed inside an outer peripheral member of the wheel, and meshes with the inner gear during braking. A brake fitting is provided, and the brake fitting is pivotally supported on the main body using rivets. Further, a mounting shaft for mounting the caster to the above-described object is provided, and a rivet for locking the neck portion of the mounting shaft to the main body is provided. The rivet locks the mounting shaft. But,
When the rivet is used as described above, it is necessary to caulk one end and the other end of the rivet, and the two-head caulking process itself requires two processes. There was a problem that hindered.

SUMMARY OF THE INVENTION According to the first aspect of the present invention, one end of a pin member for supporting a braking means (a brake fitting or the like) is supported by an inner end surface of the wheel so as to prevent the rotation of the wheel. It is an object of the present invention to provide a caster that can prevent the pin member from being pulled out by the wheel without hindrance, omit a caulking step, manufacture a caster, reduce the number of assembly steps, and achieve a cost reduction. I do. According to a second aspect of the present invention, there is provided an attaching means (an attaching shaft or the like).
By supporting one end of the pin member used to lock the pin on the main body at the inner end face of the wheel, the pin member can be prevented from being pulled out by the wheel without hindering the rotation of the wheel, and the caulking step is omitted. It is another object of the present invention to provide a caster capable of reducing the number of manufacturing and assembling steps of the caster and achieving cost reduction. According to the invention of claim 3 of the present invention, the serration is integrally formed with the mounting means (mounting shaft or the like) for mounting the caster to the object, so that the step of arranging the conventional flat washer and spring washer is omitted, and It is an object of the present invention to provide a caster capable of reducing the number of assembly steps and the number of parts and achieving cost reduction. According to a fourth aspect of the present invention, a resistance reducing means for reducing a frictional resistance between the connecting means on which a mounting means (a mounting shaft or the like) is provided is integrally formed on an upper surface of a connecting portion. No separate process is required for the means for interposing or coating the body slip member, reducing the number of caster assembly steps and the number of parts, achieving cost reduction, and reducing the rotational resistance of the caster body. It is an object of the present invention to provide a caster capable of achieving a significant reduction.

According to a first aspect of the present invention, there is provided a caster having a wheel rotatably mounted on a main body, a braking means for braking the wheel, and a pin for supporting the braking means. The caster is characterized in that one end of the member is supported and retained on the inner end surface of the wheel. According to a second aspect of the present invention, in a caster having a wheel rotatably mounted on a main body, mounting means for mounting the caster to an object is provided, and one end of a pin member for locking the mounting means is connected to an inner end surface of the wheel. It is a caster that is supported by retaining. The invention of claim 3 of the present invention
In a caster having a wheel rotatably mounted on a main body, mounting means for mounting the caster to an object is provided, and the mounting means is a caster on which a selection is formed. According to a fourth aspect of the present invention, there is provided a caster comprising a wheel rotatably mounted on a main body, a connecting portion protruding from the main body, and mounting means for mounting the caster to an object on an upper surface of the connecting portion. And a friction reducing means for reducing frictional resistance between the casters.

According to the first aspect of the present invention, since one end of the pin member for supporting the braking means is supported by the inner end surface of the wheel, the rotation of the wheel is hindered. The pin member can be prevented from coming off with the wheel. As a result, it is possible to omit the conventional caulking step, reduce the number of steps for manufacturing and assembling the casters, and achieve an effect of reducing costs. According to the invention described in claim 2 of the present invention, one end of the pin member used to lock the above-mentioned mounting means to the main body is supported by the inner end face of the wheel so as not to hinder the rotation of the wheel. The wheel can prevent the pin member from coming off. As a result, it is possible to omit the conventional caulking step, reduce the number of steps for manufacturing and assembling the casters, and achieve an effect of reducing costs. According to the third aspect of the present invention, since the serration is integrally formed with the mounting means for mounting the caster to the object, the conventional flat washer,
Omit the spring washer installation process, reduce the number of caster assembling steps and the number of parts, achieve cost reduction, and secure sufficient fixing force to the object by the serration function. There is an effect that can be. According to the invention described in claim 4 of the present invention,
Since the resistance reducing means for reducing the frictional resistance with the attaching means is integrally formed on the upper surface of the connecting portion on the main body side on which the attaching means is provided, it is possible to interpose or coat a separate sliding member. A separate process is not required, so that cost reduction can be achieved by reducing caster manufacturing, assembling man-hours, and the number of parts, and can significantly reduce rotational resistance to the mounting means on the caster body side. effective.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawings show twin-wheel casters, and FIGS.
In this case, the caster 1 has an arc-shaped wheel cover 2,
A main body 4 made of synthetic resin is formed by a partition wall 3 having a predetermined thickness integrally formed at the lower center of the wheel cover 2. Left and right synthetic resin wheels 7 and 8 are independently rotatably mounted in the axle hole 5 formed in the partition wall 3 using a single metal axle 6. These wheels 7 and 8 have a first boss portion 9 having a small diameter and a second boss portion 10 having a large diameter at their shaft cores, and an inner gear 11 for braking is integrally formed inside the outer peripheral portions of the wheels 7 and 8. In this embodiment, the first boss portions 9, 9 of the left and right wheels 7, 8 are arranged in abutting manner in the axle hole 5 in a loose fit manner. On the other hand, a vertical wall 12 having a predetermined thickness and a triangular shape in a side view, which is spaced apart from the partition wall 3, is integrally formed at the lower center in the upper region of the wheel cover 2, and is formed by drilling in the vertical wall 12. Head 1 in shaft hole 13
A brake fitting 15 as a braking means is pivotably mounted via a metal pin member 14 with 4a. In addition, as shown in FIG. 2, the outer end surface of the head 14a of the above-described pin member 14 is used as an inner end surface of one of the wheels 7.
Are supported by the inner end surface of the inner gear 11 at the position shown in FIG. Note that a minute clearance may be formed between the outer end surface of the head 14a and the inner end surface of the inner gear 11 in the axis direction of the wheel axis. The above-mentioned brake fitting 15 is a metal braking means in which a concave base end pivoting portion and a stopper piece fitted into the concave portion of the inner gear 11 are integrally connected by a main portion. A holder 16 is formed integrally with the wheel cover 2 at a position opposing the main body of the above-described brake fitting 15.
6 is provided with a push button 18 having a cam ring 17, and a guide pin is provided from the holder 16 side with respect to a heart-shaped cam groove formed in the cam ring 17, and a push-push operation of the push button 18 results in FIG. The braking state shown in FIG. 5 and the non-braking state (braking release state) shown in FIG. 5 are obtained. Here, the above-mentioned brake fitting 15 is pressed by the lower end of a shaft 19 formed integrally with the push button 18, and the back (lower face) of the brake fitting 15 is operated.
A return spring 20 is provided between the spring seat and the spring seat on the partition wall 3 side.
Is interposed. Further, a marker 21 for visually recognizing a braking state (see FIG. 4) by a user is formed in a lower region of the above-mentioned push button 18, and the braking state is visually observed by the marker 21 exposed from the holder 16 during braking. It is configured so that it can be recognized. Meanwhile, a cylindrical shaft connecting portion 22 is integrally formed of synthetic resin on the mounting side of the caster 1 including the wheel cover 2, the partition wall 3, and the vertical wall 12 in the main body 4. , A bag-shaped shaft mounting hole 23 is formed vertically. A mounting shaft 24 as mounting means is loosely fitted in the shaft mounting hole 23 described above. The mounting shaft 24 has a screw portion 25 at the upper end thereof for screwing and fixing to an object, and a flange portion 27 having a serration 26 (see FIG. 6) integrally formed on the upper surface immediately below the screw portion 25.
And a neck 28 is formed at the lower end of the mounting shaft 24. As shown in FIG. 6, the above-mentioned serration 26 does not have any resistance when the screw portion 25 is screwed (screw-in) to the object, and has resistance in the pull-out direction when screwing is completed. The function ensures a sufficient fixing force to the object. At a portion corresponding to the above-mentioned neck portion 28, a head 3 is inserted into a shaft hole 29 formed in the partition wall 3 in a horizontal direction.
A metal pin member 30 with 0a is inserted, and the mounting shaft 24 is stopped and locked by the pin member 30. In this embodiment, as shown in FIG. 3, a counterbore portion 31 for disposing the above-mentioned head portion 30a is formed on the partition wall 3 and a head portion 30a of the pin member 30 disposed on the counterbore portion 31 is formed. 2nd boss part 1 in one wheel 7 whose end part is a wheel inner end face
The inner end surface of the shaft 0 supports the stopper. The head 30a
A minute clearance may be formed between the outer end surface of the second boss portion 10 and the inner end surface of the second boss portion 10. That is, this pin member 3
0 and the above-mentioned pin member 14 are the wheels 7 on the same side, respectively.
And is supported by this inner end face. On the other hand, the mounting shaft 24
A plurality of projections 32 are integrally formed as a resistance reducing means for reducing frictional resistance between the lower surface of the flange portion 27 and the lower surface.
In this embodiment, as shown in FIG.
Are formed in parallel with each other, and the top surface thereof is formed in a semicircular cross section so as to further reduce the frictional resistance. However, instead of the ridge-shaped projection 32, a plurality of hemispherical shaped The projection may be formed integrally. As described above, one end (the outer end of the head 14a) of the pin member 14 that pivotally supports the above-described braking means (see the brake fitting 15) is connected to the inner end surface of the wheel 7 (specifically, the inner end surface of the inner gear 11). ), The pin member 14 can be prevented from being pulled off by the wheel 7 without hindering the rotation of the wheel 7.
As a result, it is possible to omit the caulking process as in the related art, to reduce the number of manufacturing and assembling steps of the caster 1, and to achieve a cost reduction. Further, one end (outer end of the head 30a) of the pin member 30 used to lock the above-mentioned mounting means (see the mounting shaft 24) to the main body is connected to the inner end surface of the wheel 7 (specifically, the inside of the second boss portion 10). End face) so that the rotation of the wheel 7 is not hindered.
Thus, the pin member 30 can be prevented from coming off. As a result, it is possible to omit the caulking process as in the related art, to reduce the number of manufacturing and assembling steps of the caster 1, and to achieve a cost reduction. Further, since the serration 26 is formed integrally with the mounting means (see the mounting shaft 24) for mounting the caster 1 to the object, the conventional process of arranging the flat washer and the spring washer is omitted, and the man-hour for assembling the caster 1 and the number of parts are reduced. In addition to reducing the cost, the cost can be reduced, and the serration function can secure sufficient fixing force and tightening force on the object. In addition, mounting means (mounting shaft 2
4) is integrally formed on the upper surface of the connecting portion (see the shaft connecting portion 22) on the side of the main body 4 on which the anti-reducing means (see the projection 32) is formed. A separate step is not required for the means for interposing or coating the body slip member, and the cost and cost can be reduced by reducing the number of manufacturing steps, the number of assembly steps and the number of parts of the caster 1, and the caster body 4 There is an effect that the rotational resistance to the mounting means on the side (see the mounting shaft 24) can be greatly reduced. Further, as shown in the embodiment, the pin members 14, 30 with the heads 14a, 30a are inserted from the same direction, respectively, and these respective pin members 14, 30 are inserted.
When the outer end of the head is supported by the inner end surface of the same wheel 7 of the two wheels, the workability of assembling the caster 1 can be improved. In the correspondence between the configuration of the present invention and the above-described embodiment, the caster of the present invention corresponds to the double-wheeled caster 1 of the embodiment, and similarly, the braking means corresponds to the brake fitting 15. The first pin member corresponds to the pin member 14.
The inner surface of the inner gear 11 of the wheel 7 corresponds to the inner end surface, the mounting means corresponds to the mounting shaft 24, the pin member of claim 2 corresponds to the pin member 30, and the inner end surface of the wheel of claim 2
The connecting portion corresponds to the shaft connecting portion 22, and the resistance reducing means corresponds to the protrusion 3.
2, the present invention is not limited to only the configuration of the above-described embodiment. For example, a pin member 1 with a head
Instead of 4 and 30, a stepped shaft-shaped pin member having a large diameter portion and a small diameter portion and a corresponding shaft hole may be used. When used, it is only necessary to drill the shaft holes 13 and 29 having the same diameter, and there is an effect that the existing pin members 14 and 30 can be used as they are.

[Brief description of the drawings]

FIG. 1 is a side view showing a caster of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view at the time of braking along the line CC in FIG. 2;

FIG. 5 is a cross-sectional view when no braking is performed.

FIG. 6 is a plan view showing serrations.

FIG. 7 is a plan view showing a resistance reducing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Main body 7, 8 ... Wheel 14, 30 ... Pin member 15 ... Brake fitting 22 ... Shaft connection part 24 ... Mounting shaft 26 ... Serration 32 ... Projection

Claims (4)

[Claims] 1. A caster comprising a wheel rotatably mounted on a main body and a braking means for braking the wheel, wherein one end of a pin member supporting the braking means is supported by an inner end face of the wheel to prevent the pin member from coming off. 2. A caster having a wheel rotatably mounted on a main body, wherein a mounting means for mounting the caster to an object is provided, and one end of a pin member for locking the mounting means is supported by an inner end surface of the wheel. . 3. A caster in which wheels are rotatably mounted on a main body, wherein said mounting means is provided for mounting said caster to an object, and said mounting means is formed with a selection. 4. A caster comprising a wheel rotatably mounted on a main body, a connecting portion protruding from the main body, and a frictional resistance between an upper surface of the connecting portion and mounting means for mounting the caster to an object. Caster integrally formed with a resistance reducing means for reducing the pressure.