JP3095131B2 - Casters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a chair,
Desk relates twin wheel Series air circuit Yasuta Stopper used attached to the bottom of the object such as instrument.

[0002]

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-mentioned object is provided, and a rivet for locking a neck portion of the mounting shaft to the main body is provided. The rivet locks the mounting shaft.

However, when a 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 has been a problem that the number of steps for manufacturing and assembling the casters increases, which hinders cost reduction.

[0005]

Problems to be Solved and Means for Solving It
Do not use rivets that require caulking
By the production of the caster, achieving a reduction in assembly man-hour, it is an object to provide a caster that can achieve cost reduction.

Means for that purpose include a cylindrical shaft connecting portion.
Attach two wheels from the left and right to the main body
In order to brake each wheel, the inner circumference of each wheel
Engages and disengages from the concave part of the inner gear with irregularities
Connect the base end of the braking means with the stopper
Pivot to allow the wheels to swing radially to enable disengagement
A caster, the pivoting of the braking member being braked.
Insert the pin member with the head into the means and the body to the left and right
And attach the wheel to the head side of the pin.
To prevent the head of the pin member from coming off at the inner end surface of the wheel.
Is a caster.

The main body is connected to the shaft connecting portion from above.
The mounting means to be inserted and mounted is also attached to the main body.
A small-diameter neck formed below the mounting means
A pin member having a head at the end of the position corresponding to
Insert the member in the same direction as the pin
And lock the wheel on the head side of the pin.
Attach and prevent the head of the pin member from pulling out on the inner end surface of the wheel
It is good to do it. The caulking process can be completely eliminated
Because it can.

[0008] Further , the shaft connection in the mounting means.
A flange portion is formed at a position facing the upper end surface of the portion.
On the upper surface of the flange,
A contact serration may be formed. Conventionally flange
Place a flat washer and spring washer on the upper side of the part
Ensuring sufficient fixing and tightening force for the target object
But it was not necessary to arrange it,
Cost reduction by reducing assembly man-hours and number of parts
This is because it is possible to achieve

Furthermore, the upper end of the shaft connecting portion of the main body is
The lower surfaces of the flanges formed on the mounting means face each other.
Resistance reducing means for reducing frictional resistance between
It may be a body. Conventionally, a separate sliding member was interposed.
Had been coated,
Yasuta assembly of working to reduce the number of steps and parts,
This is because cost reduction can be achieved.

[0010]

DETAILED DESCRIPTION OF THE INVENTION describing the embodiments of the present invention with reference to the drawings. The drawings show a two-wheeled caster. In FIGS. 1 to 4, the caster 1 is a synthetic resin comprising an arc-shaped wheel cover 2 and a partition wall 3 having a predetermined thickness integrally formed at the lower center of the wheel cover 2. Is formed.

An axle hole 5 formed in the above-mentioned partition 3 has:
Using a single metal axle 6, wheels 7 and 8 made of left and right synthetic resin are mounted so as to be independently rotatable. 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 triangular shape in a side view and having a predetermined thickness is formed integrally with the above-mentioned wheel cover 2 at the lower center in the upper region, and is formed in the vertical wall 12 by drilling. A bracket 15 as a braking means is pivotally connected to the shaft hole 13 via a metal pin member 14 having a head 14a.

Further, as shown in FIG. 2, the outer end face of the head 14a of the pin member 14 is supported by the inner end face of the inner gear 11 of one wheel 7 as the inner end face of the wheel. 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 metallic 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-mentioned brake fitting 15, and a push button 18 having a cam ring 17 is disposed on the holder 16 and the cam ring 17 is provided on the holder 16. A guide pin is provided from the holder 16 side with respect to the formed heart-shaped cam groove, and a push-push operation of the push button 18 causes a braking state shown in FIG. 4 and a non-braking state (braking released state) shown in FIG. Is configured to obtain.

Here, the above-mentioned brake fitting 15 is pressed by the lower end of a shaft 19 formed integrally with the push button 18, so that a gap is formed between the back (lower face) of the brake fitting 15 and the spring seat on the partition wall 3 side. Is provided with a return spring 20. 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.

By the way, the above-mentioned wheel cover 2, partition 3,
A cylindrical shaft connecting portion 22 is integrally formed of synthetic resin on the mounting side of the caster 1 composed of the vertical wall 12 on the main body 4, and a bag-shaped shaft mounting hole 23 is formed from the shaft connecting portion 22 toward the inside of the main body 4. It is formed vertically.

A mounting shaft 24 as a 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. By such a serration function, a sufficient fixing force to the object is ensured.

A metal pin member 30 having a head 30a is inserted into a shaft hole 29 formed in the partition wall 3 at a position corresponding to the above-mentioned neck portion 28 in a horizontal direction. The attachment shaft 24 is retained and locked.

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 of the pin member 30 disposed on the counterbore portion 31 is formed. The outer end of the portion 30a is supported by the inner end surface of the second boss portion 10 of one wheel 7 as the inner end surface of the wheel. Note that a minute clearance may be formed between the outer end surface of the head 30a and the inner end surface of the second boss portion 10. In other words, the pin member 30 and the above-described pin member 14 face the inner end surfaces of the wheels 7 on the same side, respectively, and are supported by the inner end surfaces so as not to come off.

On the other hand, a plurality of projections 32 are integrally formed on the upper surface of the shaft connecting portion 22 as a resistance reducing means for reducing frictional resistance between the lower surface of the mounting shaft 24 and the flange portion 27. In this embodiment, as shown in FIG. 7, the plurality of projections 32 are formed in parallel, and the top surface is formed in a semicircular cross section to further reduce the frictional resistance. A plurality of hemispherical projections may be integrally formed instead of the ridge-shaped projections 32.

As described above, one end (the outer end of the head 14a) of the pin member 14 for pivotally supporting the above-mentioned braking means (see the brake fitting 15) is connected to the inner end surface of the wheel 7 (specifically, the inner gear 11). (Inner end face), the pin member 14 can be prevented from falling off 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 (for more details,
(The inner end surface of the boss portion 10) so that the rotation of the wheel 7 is not hindered.
Can be prevented. 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 disposing the flat washer and the spring washer is omitted, and the number of steps for assembling the caster 1 is reduced. In addition, the cost can be reduced by reducing the number of components, and the serration function can secure sufficient fixing force and tightening force on the object.

In addition, mounting means (see mounting shaft 24)
Since the anti-reducing means (see projection 32) for reducing the frictional resistance with the mounting means is integrally formed on the upper surface of the connecting part (see shaft connecting part 22) on the main body 4 side where No separate process is required for the means for interposing or coating the members, the cost of the caster 1 can be reduced by reducing the number of manufacturing steps, assembling man-hours, and the number of parts. There is an effect that the rotational resistance to the means (see the mounting shaft 24) can be greatly reduced.

As described above, the pin members 14, 30 with the heads 14a, 30a are inserted from the same direction, respectively.
When the outer ends of the heads of the pin members 14 and 30 are supported by the inner end surfaces of the same wheel 7 of the two wheels, the caster 1
Thus, there is an effect that the workability of assembling can be improved.

In correspondence between the configuration of the present invention and the above-described embodiment , the caster of the present invention corresponds to the twin-wheel caster 1 of the embodiment , and similarly, the braking means
The pin member of claim 1 corresponds to the pin member 14, and the wheel inner end face of claim 1 corresponds to the wheel 7.
, The mounting means corresponds to the mounting shaft 24, the pin member of claim 2 corresponds to the pin member 30, and the wheel inner end surface of claim 2 corresponds to the wheel 7.
Corresponds to the inner end surface of the second boss 10 in
Corresponding to the shaft coupling portion 22, the resistance reduction means also corresponds to the protrusion 32, the invention is not limited only to the configuration of the embodiment.

For example, instead of the headed pin members 14, 30, a stepped shaft-shaped pin member having a large diameter portion and a small diameter portion;
Although a configuration with a shaft hole corresponding to this may be adopted, especially when using the pin members 14 and 30 with heads, it is only necessary to drill the shaft holes 13 and 29 having the same diameter. There is an effect that the members 14 and 30 can be used as they are.

[0029]

According to the above construction, the braking means is provided.
The pivot connection was performed only by inserting the pin member,
The dulling step becomes unnecessary. Pin member inserted
Is removed from the inner end surface of the wheel to be attached to the head side of the pin member later.
Be stopped. 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.

The mounting of the mounting means is controlled as in claim 2.
Insertion of pin members and mounting of wheels as well as pivoting of moving means
In this case, the caulking step is also omitted in this portion, so that the production and the number of assembling steps of the caster can be reduced, and the cost can be further reduced.

According to a third aspect of the present invention, a flange is provided on the upper surface of the flange.
With such a configuration, the step of disposing the conventional flat washer and spring washer can be omitted, the number of steps for assembling the casters and the number of parts can be reduced, and the cost can be further reduced .

If the resistance reducing means for reducing the frictional resistance between the mounting means and the upper end of the shaft connecting portion of the main body is integrally formed , a separate sliding member is interposed or coated. This eliminates the need for such operations , and reduces the number of caster manufacturing, assembling man-hours, and the number of parts, thereby achieving further cost reduction .

[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

Continued on the front page (56) References Japanese Utility Model Showa 51-103266 (JP, U) Japanese Utility Model Showa 54-128247 (JP, U) Japanese Utility Model Showa 54-67465 (JP, U) Japanese Utility Model Showa 55-47408 (JP, U) , U) Shokai Sho 59-193703 (JP, U) Shoko 55-26162 (JP, Y2) Shoko 56-39686 (JP, Y2) Shoko 8-3620 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60B 33/00-33/08

Claims (4)

(57) [Claims] 1. A body having a cylindrical shaft connecting portion,
Attach two wheels and attach each car to the body
An uneven surface formed on the inner circumference of each wheel to brake the wheels
Left and right stopper pieces that engage and disengage with the concave portion of the inner gear
In order to enable the above-mentioned disengagement,
A caster that is pivoted to swing the wheel in the radial direction.
Thus , a head is attached to the braking means and the main body by pivotally attaching the braking member.
A pin member to be inserted is inserted into the left and right sides, and a wheel is mounted on the head side of the pin.
A caster in which the head of the pin member is retained. 2. The body is inserted into the shaft connecting portion of the main body from above.
Mounting of the mounting means in the main body.
Corresponds to the small diameter neck formed below the mounting means
At the end of the position, a pin member having a head, the braking member
Insert the pin in the same direction as the pin
And attach the wheel to the head side of the above pin
Then, stop the head of the pin member on the inner end face of the wheel.
The caster according to claim 1, wherein the caster is used. 3. On the shaft connecting portion of the mounting means.
A flange portion is formed at a position facing the end face, and the flange portion is formed.
On the upper surface of the part with resistance to the mounting object
3. The serration according to claim 1, wherein the serration is formed.
Casters. 4. An upper end of a shaft connecting portion of the main body, wherein
On the surface where the lower surface of the flange part formed on the attachment means faces,
Integrally forming resistance reduction means to reduce frictional resistance between each other
The caster according to any one of claims 1 to 3 .