JPH07266803A - Caster braking mechanism - Google Patents

Abstract

(57) [Summary] [Structure] A frame 2 that can rotate freely under the spindle 1.
In the caster with the wheels 3 rotatable, a vertically movable operation pin 4 is provided on the support shaft, and an operation lever 5 is horizontally provided above the operation pin. While the engagement gear 6 is fixed, the braking arm 7 is pivotally supported inside the frame, the engagement gear 8 is fixed to the outer periphery of the lateral pin 3a of the wheel, and the operation pin is constantly pressed upward by the spring 10, The cam body 9 operated by the operation lever is brought into contact with the upper end of the operation pin, the lower end of the operation pin is connected to the braking arm, and the support shaft braking body 13 rotating coaxially with the braking arm is engaged with the engagement gear. The wheel 6 is detachably attached to the tooth 6a, and the wheel braking body 14 attached to the braking arm is detachably attached to the engaging tooth 8a of the engaging gear. [Effect] The appearance of the caster is not impaired, and the caster can be easily applied to a twin-wheel caster having a wide width.
Even if the outer periphery of the wheel 3 becomes dirty or foreign matter adheres to the outer periphery of the wheel 3, the rotation of the wheel 3 can be braked completely and reliably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking mechanism for casters used in transport machinery, shopping carts and other transport vehicles, and more particularly to a caster capable of simultaneously braking the rotation of a frame and the rotation of wheels. The present invention relates to the braking mechanism.

[0002]

2. Description of the Related Art Conventionally, a brake mechanism for a caster of this type has a frame 2 as shown in FIGS.
In a caster in which a pedestal 20 is rotatably rotatably supported and wheels 3 are rotatably rotatably supported on a frame 2, a braking member formed in a front gate shape having a contact portion 21 and a bent opposing leg portion 22 with a steel wire rod. 23 is made to straddle the wheel 3, the contact part 21 is slidably always fitted in the brake body engaging groove 24 of the frame 2, and both lower ends of the opposing leg part 22 are rocked on the frame 2 about the axle 25. The operation pedal 19 movably attached is coupled to the axle 25 at a position deviated from the axial support portion. A frame turning prevention plate that pivotally connects one end to a part of the contact portion 21 on the upper portion of the wheel 3 between the frames 2 and engages and disengages the engaging claw 26 at the other end with the radial cut groove 28 on the holding body 27. 29 is attached so as to be swingable around a spindle 30.

In the conventional caster braking mechanism constructed as described above, the brake pedal 23 is pulled down under the guidance of the braking groove 24 by operating the operation pedal 19 to push the contact portion 21 out of the wheel 3. Make contact with a part of the circumference, and further opposite legs
22 is pulled in to extend and deform the bent portion to apply contact pressure by this spring action to brake the rotation of the wheel 3, and the engaging claw 26 of the frame turning prevention plate 29 is held by the holding body 27.
The upper radial notch 28 is engaged to prevent the frame 2 from pivoting.

[0004]

However, in the above conventional caster braking mechanism, since the operation pedal 19 is provided in a state of being exposed from the front side to the side of the frame 2, the appearance of the caster is impaired, and In this condition, the operation pedal 19
Had a problem that it was difficult to provide.

In the conventional caster braking mechanism, the rotation of the wheel 3 is braked by frictional force by bringing the contact portion 21 into contact with a part of the outer periphery of the wheel 3. If the outer circumference is soiled or foreign matter is attached to the outer circumference of the wheel 3 to reduce the frictional force, the rotation of the wheel 3 cannot be braked reliably.

Therefore, the present invention has been made to solve the problems of the conventional braking mechanism for casters.

[0007]

Therefore, in the caster braking mechanism of the present invention, in the caster in which the wheel 3 is rotatably attached to the frame 2 attached to the lower portion of the support shaft 1, the support shaft 1 is attached to the support shaft 1. A vertically movable operation pin 4 is provided, an operation lever 5 is horizontally provided above the operation pin 4, and an engagement gear 6 is fixed to a lower portion of the support shaft 1 so that the inside of the frame 2 is secured. The brake arm 7 is pivotally supported on the wheel 3, the engaging gear 8 is fixed to the outer periphery of the lateral pin 3a of the wheel 3, and the operation pin 4 is constantly pressed upward by the spring 10 while being operated by the operation lever 5. The cam body 9 is brought into contact with the upper end of the operation pin 4 so that the operation pin 4
Is connected to the braking arm 7 and a support shaft braking body 13 which rotates coaxially with the braking arm 7 is detachably arranged on the engaging tooth 6a of the engaging gear 6 and is attached to the braking arm 7. The mounted wheel braking body 14 is disengageably arranged on the engaging teeth 8a of the engaging gear 8.

In the caster braking mechanism of the present invention, the lower end of the operating pin 4 is applied to the upper end of the adjusting bolt 11 attached to the braking arm 7 without connecting the lower end of the operating pin 4 to the braking arm 7. You may contact.

Further, the engaging tooth 6a of the engaging gear 6 is formed in a triangular tooth shape, the engaging portion of the support shaft braking body 13 is formed in a triangular shape corresponding to the triangular tooth shape, and the engaging gear 8 is engaged. It is preferable that the joint teeth 8a have a triangular tooth shape and the engaging portion of the wheel braking body 14 has a triangular shape corresponding to the triangular tooth shape.

Further, it is preferable that the support shaft braking body 13 is provided with a kick spring 13a and the wheel braking body 14 is provided with a coil spring 14b.

[0011]

The caster braking mechanism of the present invention, having the above-mentioned means, has the following action.

First, since the operating lever 5 is attached to the support shaft 1, the caster frame 2 has no protrusion and is clean.

Further, by operating the operation lever 5, the support shaft braking body 13 which rotates coaxially with the braking arm 7 is engaged with the engagement teeth 6a of the engagement gear 6 fixed to the lower portion of the support shaft 1. The wheel braking body 14 attached to the braking arm 7
Can be engaged with the engaging teeth 8a of the engaging gear 8 fixed to the outer periphery of the lateral pin 3a of the wheel 3 to brake the turning of the frame 2 and the rotation of the wheel 3 at the same time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a brake mechanism for casters according to the present invention will be described below with reference to the drawings shown as embodiments.

1 to 6 show a twin-wheel type caster provided with a caster braking mechanism according to the present invention, in which a wheel 2 is attached to a frame 2 which is pivotally attached to a lower portion of a support shaft 1.
Is rotatably attached.

An operation pin 4 which is vertically movable is provided on the support shaft 1.
Is provided in a vertical direction, an operation lever 5 is provided in a horizontal direction above the operation pin 4, and an engaging gear 6 is fixed to a lower portion of the support shaft 1. A braking arm 7 is pivotally supported inside the frame 2. Further, an engagement gear 8 is fixed to the outer periphery of the lateral pin 3a of the wheel 3.

The operation lever 5 is provided so as to penetrate the support shaft 1 in the horizontal direction, and is configured to rotate the cam body 9 mounted in the cam chamber 1a of the support shaft 1. Operation pin 4
Is constantly pressed upward by the spring 10 mounted in the spring chamber 1b of the support shaft 1, while the cam body 9 is pushed by the operating pin 4
Abut on the upper end of. The lower end of the operating pin 4 is brought into contact with the upper end of the adjusting bolt 11 screwed into the braking arm 7 and attached. The tip end of the support shaft braking body 13 that rotates coaxially with the braking arm 7 via the return spring 12 is disengageably attached to the engaging tooth 6a of the engaging gear 6. Further, the wheel braking body 14 attached to the lower portion of the braking arm 7
The engaging end 14a of is engaged with and disengageable from the engaging tooth 8a of the engaging gear 8.

Although not shown, the lower end of the operation pin 4 may be connected to the braking arm 7. In this case, since the braking arm 7 is interlocked with the operation of the operation pin 4, the return spring 12 is unnecessary.

If the engagement teeth 6a of the engagement gear 6 and the tip of the support shaft braking body 13 do not match, the tip of the support shaft braking body 13 does not enter the engagement tooth 6a of the engagement gear 6. Therefore, it is preferable that the support shaft braking body 13 is provided with a kick spring 13a so that the tip end of the support shaft braking body 13 is pushed into the engagement tooth 6a of the engagement gear 6 when both are matched. Further, the engaging teeth 8a of the engaging gear 8 and the engaging end 14a of the wheel braking body 14
Even if the above does not match, the engagement end 14a of the wheel braking body 14 does not enter the engagement teeth 8a of the engagement gear 8 and therefore the wheel braking body 14
It is preferable that the coil spring 14b is provided on the coil 14.

Further, when the engaging teeth 6a of the engaging gear 6 are formed in a triangular tooth shape and the tip of the support shaft braking body 13 is formed in a triangular shape corresponding to the triangular tooth shape, both are slightly displaced. However, the tip of the support shaft braking body 13 slides into the engaging teeth 6a of the engaging gear 6. Further, even when the engaging teeth 8a of the engaging gear 8 is formed in a triangular tooth shape and the engaging end 14a of the wheel braking body 14 is formed in a triangular shape corresponding to the triangular tooth shape, both are slightly displaced. However, the engagement end 14a of the wheel braking body 14 slides into the engagement tooth 8a of the engagement gear 8.

The caster braking mechanism of the present invention constructed as described above is operated as follows.

First, for braking, when the operation lever 5 is rotated from the state shown in FIGS. 4 and 5 to bring the cam body 9 into the state shown in FIG. 6, the cam body 9 and the upper end of the operation pin 4 are brought into contact with each other. Comes into contact with the long side of the cam body 9, and the operating pin 4 overcomes the pressing force of the spring 10 and is pushed down. When the operation pin 4 is lowered, the lower end of the operation pin 4 pushes down the adjustment bolt 11, so that the braking arm 7 overcomes the pressing force of the return spring 12 and rotates, and rotates coaxially with the braking arm 7. Engagement gear 6 in which the tip of the support shaft braking body 13 is fixed to the lower part of the support shaft 1.
The engaging teeth 6a of the frame 2 are engaged, and the swing of the frame 2 is braked. Furthermore, the rotation of the braking arm 7 causes the braking arm 7 to rotate.
The engaging end 14a of the wheel braking body 14 attached to the wheel engages with the engaging tooth 8a of the engaging gear 8 fixed to the lateral pin 3a of the wheel 3 to brake the rotation of the wheel 3.

Next, in order to release the braking, the operating lever 5 is rotated from the state shown in FIG.
When returning to the state shown in, the contact between the cam body 9 and the upper end of the operation pin 4 is on the shorter diameter side of the cam body 9, and the operation pin 4 is replaced by the spring 10.
It is pushed by and rises. When the operation pin 4 is raised, the braking arm 7 and the support shaft braking body 13 are rotated by the pressing force of the return spring 12 to return to the original state, and the tip of the support shaft braking body 13 is moved to the support shaft 1. It disengages from the engagement teeth 6a of the engagement gear 6 fixed to the lower part, and the rotation of the frame 2 is released. Further, the braking arm 7 rotates to return to the original state, so that the engagement end 14 of the wheel braking body 14 attached to the braking arm 7 is
a disengages from the engagement teeth 8a of the engagement gear 8 fixed to the lateral pin 3a of the wheel 3, and the braking of the rotation of the wheel 3 is released.

[0024]

Since the caster braking mechanism of the present invention is constructed as described above, it has the following effects.

First, in the caster braking mechanism of the present invention, since the operation lever 5 is attached to the support shaft 1,
Since the caster frame 2 has no protrusion and is clean, the appearance of the caster is not impaired, and the caster frame 2 can be easily applied to a two-wheel type caster having a wide width.

Further, in the caster braking mechanism of the present invention, the braking arm 7 is operated by operating the operating lever 5.
Since the wheel braking member 14 attached to the wheel 3 can be engaged with the engaging teeth 8a of the engaging gear 8 fixed to the lateral pin 3a of the wheel 3 to brake the rotation of the wheel 3, the outer circumference of the wheel 3 may become dirty. Even if foreign matter adheres to the outer circumference of the wheel 3, the rotation of the wheel 3 can be braked completely and reliably.

[Brief description of drawings]

FIG. 1 is a side view of a caster provided with a braking mechanism of the present invention.

FIG. 2 is a front view of a caster including the braking mechanism of the present invention.

FIG. 3 is a bottom view of a caster including the braking mechanism of the present invention.

FIG. 4 is a partially cutaway explanatory view showing a state where braking of the braking mechanism of the present invention is released.

FIG. 5 is a cross-sectional view showing a state where the braking of the braking mechanism of the present invention is released.

FIG. 6 is a cross-sectional view showing a braking state of the braking mechanism of the present invention.

FIG. 7 is a perspective view of a braking arm of the braking mechanism of the present invention.

FIG. 8 is a side view of a support shaft braking body of the braking mechanism of the present invention.

FIG. 9 is a front view of a support shaft braking body of the braking mechanism of the present invention.

FIG. 10 is a plan view of a wheel braking body of the braking mechanism of the present invention.

FIG. 11 is a front view of a caster including a conventional braking mechanism.

FIG. 12 is an explanatory diagram showing an operating state of a conventional caster braking mechanism.

[Explanation of symbols]

 1 spindle 2 frame 3 wheel 3a lateral pin 4 operating pin 5 operating lever 6 engaging gear 6a engaging tooth 7 braking arm 8 engaging gear 8a engaging tooth 9 cam body 10 spring 11 adjusting bolt 13 spindle braking body 13a kick spring 14 Wheel brake 14b Coil spring

Claims (4)

[Claims] 1. A caster in which a wheel (3) is rotatably attached to a frame (2) rotatably attached to a lower portion of a support shaft (1), and an operation pin which is vertically movable on the support shaft (1). (4) is provided in the vertical direction, and this operation pin (4)
The operating lever (5) is provided in the horizontal direction above, and the engaging gear (6) is fixed to the lower part of the support shaft (1) to pivotally support the braking arm (7) inside the frame (2). At the same time, the engaging gear (8) is fixed to the outer periphery of the lateral pin (3a) of the wheel (3), and the operating pin (4) is constantly pressed upward by the spring (10) while operating lever (5). The cam body (9) operated by is brought into contact with the upper end of the operation pin (4), the lower end of the operation pin (4) is connected to the braking arm (7), and further coaxial with the braking arm (7). Rotating spindle brake (13)
Is disengageably arranged on the engaging tooth (6a) of the engaging gear (6), and the wheel braking body (14) attached to the braking arm (7) is attached to the engaging tooth (8) of the engaging gear (8). (8a) A braking mechanism for casters, which is disengageably arranged. 2. A caster in which a wheel (3) is rotatably attached to a frame (2) rotatably attached to a lower portion of a support shaft (1), and an operation pin which is vertically movable on the support shaft (1). (4) is provided in the vertical direction, and this operation pin (4)
The operating lever (5) is provided in the horizontal direction above, and the engaging gear (6) is fixed to the lower part of the support shaft (1) to pivotally support the braking arm (7) inside the frame (2). At the same time, the engaging gear (8) is fixed to the outer periphery of the lateral pin (3a) of the wheel (3), and the operating pin (4) is constantly pressed upward by the spring (10) while operating lever (5). The cam body (9) operated by is brought into contact with the upper end of the operating pin (4), and the lower end of the operating pin (4) is brought into contact with the upper end of the adjusting bolt (11) attached to the braking arm (7). Further, the support shaft braking body (13) which rotates coaxially with the braking arm (7) is disengageably arranged on the engaging tooth (6a) of the engaging gear (6),
A caster braking mechanism characterized in that a wheel braking body (14) attached to a braking arm (7) is disengageably attached to an engaging tooth (8a) of the engaging gear (8). 3. The engaging teeth (6a) of the engaging gear (6) are formed in a triangular tooth shape, and the engaging portion of the support shaft braking body (13) is formed in a triangular shape corresponding to the triangular tooth shape. Further, the engaging teeth (8a) of the engaging gear (8) have a triangular tooth shape, and the engaging portion of the wheel braking body (14) has a triangular shape corresponding to the triangular tooth shape. Claim 1 or 2
Braking mechanism for the casters described. 4. A kick spring (13a) is attached to the support shaft braking body (13).
And the coil spring (14) on the wheel braking body (14).
The caster braking mechanism according to claim 1 or 2, wherein b) is provided.