JPH07265145A - Overspeed braking roller and drawer system using the same - Google Patents

Abstract

PURPOSE:To buffer collision with the main body of a cabinet by using braking force when the speed at the time of housing is too high by providing a non- rotary braking member equipped with a circular inner face to be frictionally touched with a braking pad which is rotated with a rotary wheel and displaced outside a radial direction with centrifugal force. CONSTITUTION:An overspeed braking roller A is provided with a braking pad 2 to be rotated together with a rotary wheel 1 and displaced outside the radial direction with the centrifugal force and a nonrotary braking member 4 equipped with a circular inner face 3 to frictionally touch the braking pad 2. A pair of braking pads 2 and 2 are interlocked through elastic bodies 8 and 8 to a ring-shaped holding member 7. When the braking pads 2 and 2 so operated on a drawer touches frictionally the circular inner face 3 of the braking member 4, frictional force, namely, braking force is operated by centrifugal force in proportion to the square of angular velocity. On the other hand, while the moving speed of the drawer is settled within a certain range from '0' to a fixed value, no bracking is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an over-rotation braking roller and a drawing device using the over-rotation braking roller, and more particularly to over-rotation braking which exerts a braking force according to the speed when the rotational angular velocity of the roller becomes too large. The present invention relates to a roller and a drawing device using the same.

[0002]

2. Description of the Related Art Conventionally, rolling rollers are attached to the rear portions of both side surfaces of a drawer so that the drawer can be smoothly drawn out and pushed in, and both inside surfaces of a storage body such as a desk, a cabinet or a wagon for storing the drawer. Attaching a rail having an upper surface on which the rolling roller rolls,
Further, a pullout device having a structure in which fixed rollers are attached to the front end portions of both inner surfaces of the accommodation main body, and rails having lower surfaces mounted on the fixed rollers are attached to both side faces of the drawer are very generally provided.

Here, the rotary roller such as the rolling roller and the fixed roller has a structure in which a rotary wheel is freely rotatably mounted on a mounting shaft thereof, and further, a pulling-out operation and a pushing-in operation of a drawer full of articles are carried out. In order to make the operation lighter, a structure in which a bearing is interposed between the mounting shaft and the rotating wheel so as to rotate more smoothly is generally adopted.

However, since the conventional rotary roller has a small rotational frictional resistance, it tends to rotate too lightly once it starts to rotate. Especially, when the drawer is pushed in and stored, if the drawer is pushed in too fast, it will be stored. The contents collide with the main body of the container and the contents move, or a large impact sound (80 to 90
dB) is generated.

[0005]

Therefore, in view of the above-mentioned situation, the present invention is to solve the problem that at the time of low speed rotation, it rotates with the same lightness as a normal rotating roller, and at the time of high speed rotation, the rotational angular velocity Provided is an over-rotation braking roller in which a braking force proportional to the square is applied, and by using the over-rotation braking roller, if the speed at the time of retracting and retracting the drawer is too high, the speed is squared. The point is to provide a drawer device that can reduce the collision with the housing body by decelerating due to proportional braking force.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a braking pad which rotates together with a rotating wheel and is displaced radially outward by a centrifugal force, and which has a circular shape which contacts the braking pad. An over-rotation braking roller having a non-rotating braking member having an inner surface is constructed.

More specifically, a mounting shaft for rotatably mounting the rotating wheel to a mounted member is provided on one axial side of the rotating wheel, and extends in the diametrical direction on the other axial side of the rotating wheel. The guide member is fixed, a pair of braking pads are mounted on the guide member so as to be slidable in the radial direction, and both the braking pads and the holding members fixed to the shaft center are connected by elastic bodies, respectively, to be attached. A braking plate of a braking member having a substantially L-shaped cross section, which is projectingly provided on the body, is disposed orthogonally to the other side in the axial direction of the rotating wheel, and the braking pad is disposed in a circular hole formed in the braking plate. An over-rotation braking roller was constructed.

Then, an over-rotation braking roller is attached to both side surfaces of the drawer and one of both inner surfaces of the accommodating main body for storing the drawer, and a rail for contacting the roller with the other and guiding the drawer to move back and forth is attached. The over-rotation braking roller includes a braking pad that rotates with a rotating wheel and is displaced radially outward by a centrifugal force, and a non-rotating braking member that has a circular inner surface that contacts the braking pad. Configured the device.

Further, an over-rotation braking roller is mounted on both side surfaces of the drawer and one of both inner surfaces of a housing body for storing the drawer, and a rail for guiding the drawer back and forth by contacting the roller is mounted on the other side. The over-rotation braking roller is provided with a mounting shaft projecting on one side in the axial direction of the rotary wheel for rotatably mounting the rotary wheel to the mounted body, and extends in the diametrical direction on the other side in the axial direction of the rotary wheel. In addition to fixing the guide member, a pair of brake pads are mounted on the guide member so as to be slidable in the radial direction, and both brake pads and holding members fixed to the shaft center are connected by elastic bodies, respectively A drawer formed by arranging a braking plate of a braking member having a substantially L-shaped cross section, which is provided in a projecting manner, on the other side in the axial direction of the rotating wheel and at the same time, the braking pad is disposed in a circular hole formed in the braking plate. Configured the device.

[0010]

In the over-rotation braking roller of the present invention having the above contents, when the rotating wheel rotates, a centrifugal force proportional to the square of the rotational angular velocity acts on the braking pad that rotates together with the rotating wheel, and the centrifugal force The force causes the braking pad to contact the circular inner surface of the non-rotating braking member, so that a braking force proportional to the square of the angular velocity of the rotating wheel is exerted. The action will be explained in detail below, but in order to simplify the analysis, the action of gravity was ignored, and the frictional force other than the frictional force between the braking pad and the circular inner surface was ignored, and the braking pad was regarded as a mass point. Assume an ideal case. Here, assuming that the angular velocity of the rotating wheel is ω, the mass of the braking pad is m, the radius of the circular inner surface is r ₀ (= constant), and the dynamic friction coefficient between the braking pad and the circular inner surface is μ, the braking pad contacts the circular inner surface. The centrifugal force F _C acting on the braking pad in the running state is mω ² r ₀ . The frictional force F _R generated by one braking pad is F _R = μF _C =
μmω ² r ₀ , and the braking force (friction force) proportional to ω ² is applied to the rotating wheel rotating at the angular velocity ω.

When the braking pad and the holding member fixed to the shaft center are connected by elastic bodies, the spring multiplier of the elastic body is set to k, and the elastic force of the elastic body does not act, and the braking pad. Is a circular inner surface, that is, a displacement amount when it contacts the inner edge of the circular hole of the braking member is x ₀ , a vertical load F _V acting at a right angle on the inner edge of the circular hole is F _V = F _C −kx ₀ . Therefore, after all, the frictional force F _R generated by one braking pad becomes F _R = μF _V = μ (mω ² r ₀ −kx ₀ ), and considering that kx ₀ is a constant, the rotational speed is ω. The braking force (friction force) proportional to ω ² is applied to the rotating wheel as described above. Further, when the angular velocity of the rotating wheel is low, there is a state where _FR is 0, that is, a state where no braking force acts. This condition is a state where the braking pad and the elastic force of the elastic body are balanced, and mω ² r =
It satisfies kx. The critical condition for the angular velocity is
mω _S ² r ₀ = kx ₀ , and ω _S = √ (kx ₀ / mr
₀ ). Therefore, when the angular velocity ω is in the range of 0 ≦ ω ≦ ω _S , the braking force does not act on the rotating wheel, and when it is in the range of ω _S <ω, the braking force proportional to ω ² acts. is there.

Then, the above-mentioned over-rotation braking roller is attached to both side surfaces of the drawer and one of both inner surfaces of the accommodating main body for storing the drawer, and a rail for contacting the roller and guiding the drawer back and forth is attached to the other. In the drawer device configured as described above, if the radius of the rotating wheel is R and the moving speed of the drawer is v, there is a relationship of v = Rω, and therefore, the braking force generated when the drawer is moved at the speed v ( Frictional force)
F _R = μmω ² r ₀ = μm (v / R) ² r ₀
It is proportional to the square of the velocity v. The total braking force of the drawer is proportional to the number of over-rotation braking rollers.

Further, in the pulling-out device using the over-rotation braking roller in which the braking pad and the holding member fixed to the shaft center portion are connected by the elastic body, the speed v is 0≤v≤v similarly to the above.
If it is in the range of _S, the braking force does not act, and if it is in the range of v _S <v, the braking force proportional to v ² acts, and the total braking force of the drawer is proportional to the number of over-rotation braking rollers. To do. Here, v _S = Rω _S = R√ (kx ₀ / mr ₀ )
Is.

[0014]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a state in which an over-rotation braking roller A of the present invention is attached to a drawer B, and FIGS. 2 to 5 show a typical embodiment of the over-rotation braking roller A.

The over-rotation braking roller A of the present invention comprises a rotating wheel 1
The gist of the present invention is to include a braking pad 2 that rotates together with the braking pad 2 and is displaced radially outward by a centrifugal force, and also includes a non-rotating braking member 4 having a circular inner surface 3 that contacts the braking pad 2.

More specifically, a mounting shaft 5 for rotatably mounting the rotary wheel 1 on the mounted body B1 is provided on one axial side of the rotary wheel 1, and the other axial side of the rotary wheel 1 is provided. The guide member 6 extending in the diametrical direction is fixed to the guide member 6, and a pair of braking pads 2 and 2 are mounted on the guide member 6 so as to be slidable in the radial direction and fixed to both the braking pads 2 and 2 and the axial center portion. The holding members 7 are connected to each other by elastic bodies 8 and the braking plate 9 of the braking member 4 having a substantially L-shaped cross section, which is provided to project from the mounted body B1, is arranged orthogonally to the other side in the axial direction of the rotary wheel 1. With
The braking pad 2 is provided in a circular hole 10 formed in the braking plate 9.
2 are arranged.

The rotary wheel 1 is rotatably mounted on a mounting shaft 5 with a bearing (not shown) interposed, and preferably uses a rubber material on the outer circumference. Since the mounting shaft 5 is usually a screw shaft and is inserted into the mounting hole 11 of the mounted body B1 and fastened with the nut 12, it is mounted by screwing directly into the screw hole formed in the mounted body B1. is there. Here, in this embodiment, the attached body B1 is a guide member 13 fixed to both side surfaces of the drawer B.

Further, the guide member 6 has a through hole 15 formed at the center of the substrate 14, and both sides of the substrate 14 radially outside the through hole 15 are bent in parallel to form two pairs of upright pieces. 16,
16 is formed, and the braking pad 2 is guided slidably in the radial direction in the concave groove formed by the pair of upstanding pieces 16, 16 and the base plate 14, respectively.

The pair of braking pads 2 and 2 are connected to the ring-shaped holding member 7 via coil springs 8a and 8a as elastic bodies 8 and, for example, as shown in FIG. Mooring portions 18, 18 are formed in the recess 17 formed inwardly in the radial direction 2 and the end of the holding member 7, respectively, and hook portions at both ends of the coil spring 8a are hooked and connected to the mooring portions 18, 18. Of. The end surface of the braking pad 2 on the outer side in the radial direction is a curved surface 19 that matches the curvature of the circular inner surface 3.

Then, on the axial end surface of the rotary wheel 1,
A circular mounting seat 20 is provided so as to project, and a screw hole 21 is formed in the center of the mounting seat 20, and the base plate 14 of the guide member 6 is oriented in the diametrical direction of the mounting seat 20 to be joined to the mounting seat 20. The fixing screw 22 is attached to the central hole 23 and the through hole 15 of the holding member 7 in a state where the pair of braking pads 2 and 2 are mounted and joined around the through hole 15 of the guide member 6 of the ring-shaped holding member 7. Each member is fixed to the rotary wheel 1 by being inserted and screwed into the screw hole 21.

The braking member 4 is formed by bending a metal plate into a substantially L-shaped cross section, and bends one end edge of the fixed plate 24 parallel to the axial direction of the rotary wheel 1 at a right angle. Then, the braking plate 9 is formed, and the other end is bent at a right angle so that the fixing piece 2
In the state where the fixing piece 25 is inserted into the horizontally elongated slit hole 26 formed in the guide member 13 (attached body B1) and the fixing piece 25 is in contact with the inner surface of the guide member 13, It is fixed by spot welding.

As shown in FIGS. 3 and 4, the rotating wheel 1 of the over-rotation braking roller A attached to the drawer B is
It is placed on the upper surface of rails 27 provided on both inner surfaces of the housing main body C such as a desk, cabinet or wagon, and the rotary wheel 1 rotates when the drawer B is pulled out and pushed in. That is, when a centrifugal force corresponding to the moving speed of the drawer B acts on the braking pads 2 and 2, and the braking pads 2 and 2 contact the circular inner surface 3 of the braking member 4, a frictional force corresponding to the magnitude of the centrifugal force is generated. That is, the braking force works.

Here, in the above-described embodiment, the braking pad 2
The holding member 7 and the elastic body 8 are combined separately, but as shown in FIG. 6, the braking pad 2, the holding member 7 and the elastic body 8 may be integrally molded of synthetic resin. is there. That is, the pair of braking pads 2, 2 and the holding member 7 are connected by the zigzag plate spring portions 8b, 8b as the elastic body 8. Also, FIG.
As shown in FIG. 2, the braking pad 2, the holding member 7 and the elastic body 8 are
Are integrally molded with an elastomer to form a thin constricted portion between the braking pad 2 and the holding member 7, and this portion is used as the extending portions 8c, 8c as the elastic body 8. In this case, it is possible to form the braking pad 2 and the holding member 7 with synthetic resin and integrally form only the extending portions 8c and 8c with elastomer. Further, it is also possible to connect the braking pad 2 and the holding member 7 by forcibly fitting the extension portion 8c formed of an elastomer.

In an actual drawer, rotating rollers are provided so as to project from the front ends of both inner surfaces of the accommodating main body C, and the lower surface of the rail 28 formed on the upper edge of the guide member 13 of the drawer B is attached to the rotating rollers. Although mounted, it is possible to replace this rotating roller with the over-rotation braking roller A of the present invention to further enhance the deceleration effect.

In the drawer device having such a structure, when the drawer B is pulled out more than half forward, the rotary wheel 1 of the over-rotation braking roller A attached to the rear part comes from the upper surface of the rail 27 fixed to the housing body C. Since the rails 27 are separated from each other, the rail 27 having a substantially U-shaped cross section is actually used, and the rotary wheel 1 normally rolls on the upper surface of the lower rail 27. Then, as shown in FIG. 1, it is desirable to project a slider 29 on the upper surface of the fixed plate 24 of the braking member 4 so that the lower surface of the upper rail is brought into sliding contact when pulled out.

As another embodiment, the over-rotation braking roller A shown in FIGS. 8 to 10 has an annular groove 30 coaxially formed on the side where the mounting shaft 5 of the rotary wheel 1 is projected. At the same time, a pair of braking pads 2 and 2 are pivotally mounted in the recess 17 at the eccentric positions by the pins 31 and 31, respectively.
At the same time when fixing the to the mounted body B1, the central portion of the disc-shaped braking member 4 is clamped and fixed between the annular step portion 32 of the mounting shaft 5 and the mounted body B1, and the outer periphery of the braking member 4 is fixed. The cylindrical portion 33 formed in the above is positioned radially outward of the braking pads 2 and 2 and is loosely inserted into the annular groove 30. here,
The structure for pivotally attaching the braking pad 2 is not limited to the structure using the pin 31, and the braking pad 2 may be provided in the circular concave groove 30 of the rotary wheel 1 in a circular cross section formed in the central portion or the radial wall surface. It is also possible to adopt a structure in which a convex portion having a circular cross section that is provided so as to project at one end is rotatably fitted. Then, as shown in FIG. 11, when the rotating wheel 1 rotates about the non-rotating mounting shaft 5, both braking pads 2 and 2 are rotationally displaced outward in the radial direction about the pins 31 and 31, The braking force works by rubbing against the inner surface of the cylindrical portion 33 of the braking member 4, that is, the circular inner surface 3. In the figure, 34 is a bearing provided between the rotary wheel 1 and the mounting shaft 5. Further, although not shown, the braking pads 2 and 2 can also impart a resistance force to the outward displacement in the radial direction due to the centrifugal force by the elastic body, similarly to the above.

Thus, the over-rotation braking roller A of the present invention is
Has a braking force that is proportional to the square of the angular velocity of the rotating wheel 1, but appropriate measures can be taken to increase the braking force. For example, increasing the weight of the braking pad 2, combining the materials of the braking pad 2 and the circular inner surface 3 with a large dynamic friction coefficient, or roughening the contact surface between the braking pad 2 and the circular inner surface 3, It is possible to increase the radius of the circular inner surface 3 as much as possible. All of these increase the centrifugal force of the braking pad 2 and increase the frictional resistance force.

[0028]

As described above, the over-rotation braking roller of the present invention includes a braking pad that rotates together with a rotating wheel and is displaced radially outward by a centrifugal force, and has a circular inner surface that contacts the braking pad. Since the non-rotating braking member is provided, when the rotating wheel rotates, a centrifugal force proportional to the square of the rotational angular velocity acts on the braking pad that rotates together with the rotating wheel, and the centrifugal force causes the braking pad to rotate. The braking force proportional to the square of the angular velocity of the rotating wheel is applied by rubbing against the circular inner surface of the braking member, and it is possible to decelerate against too fast rotation.

Further, when the braking pad and the holding member fixed to the shaft center are connected by elastic bodies, respectively, when the angular velocity of the rotating wheel is within a certain range from 0, a braking force is applied to the rotating wheel. Does not work, and if the angular velocity becomes faster than that, a braking force proportional to the square of the angular velocity acts, so that smooth rotation can be performed at low speeds, and deceleration can only be performed for too fast rotations.

Then, the drawer device using the above-mentioned over-rotation braking roller as a guide rotation roller exerts a braking force proportional to the square of the moving speed of the drawer to decelerate against the moving speed that is too fast. It is possible to reduce the impact with the housing body. Further, when the braking pad and the holding member fixed to the shaft center are connected by elastic bodies, respectively, the braking force does not work on the drawer when the moving speed of the drawer is within a certain range from 0, When the speed becomes faster than that, a braking force proportional to the square of the moving speed works, so that the pulling-out operation and the pushing-in operation of the drawer can be smoothly performed at the low speed, and the speed is reduced only when the moving speed is too fast. Similarly, the collision with the housing body can be mitigated. Then, if the pushing speed of the drawer is reduced to 100 mm / sec, the impact noise can be reduced to 60 dB.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an over-rotation braking roller of the present invention is attached to a drawer.

FIG. 2 is an exploded perspective view of the over-rotation braking roller of the present invention.

FIG. 3 is a side view of the same assembled state.

FIG. 4 is a longitudinal cross-sectional view of essential parts in an assembled state showing a relationship between a drawer and a housing body when the drawer is configured by using an over-rotation braking roller.

FIG. 5 is an enlarged perspective view showing an assembled state of a braking pad, a holding member, and an elastic body.

FIG. 6 is an enlarged perspective view showing an example in which a braking pad, a holding member, and an elastic body are integrated.

FIG. 7 is an enlarged perspective view showing another example of the same.

FIG. 8 is a vertical sectional view of another embodiment of the over-rotation braking roller in an assembled state.

9 is a cross-sectional view taken along line XX of FIG.

FIG. 10 is a cross-sectional view showing a state where the rotary wheel has rotated from the state of FIG. 9.

[Explanation of symbols]

 A over-rotation braking roller B drawer B1 mounted body C housing body 1 rotating wheel 2 braking pad 3 circular inner surface 4 braking member 5 mounting shaft 6 guide member 7 holding member 8 elastic body 8a coil spring 8b leaf spring portion 8c extension portion 9 braking Plate 10 Circular hole 11 Mounting hole 12 Nut 13 Guide member 14 Board 15 Through hole 16 Standing piece 17 Recessed portion 18 Mooring portion 19 Curved surface 20 Mounting seat 21 Screw hole 22 Fixing screw 23 Center hole 24 Fixing plate 25 Fixing piece 26 Slit hole 27 Rail (drawer side) 28 Rail (accommodation main body side) 29 Slider 30 Annular groove 31 Pin 32 Annular step 33 Cylindrical part 34 Bearing

Claims (4)

[Claims] 1. A braking pad that rotates together with a rotating wheel and is displaced radially outward by a centrifugal force, and a non-rotating braking member having a circular inner surface that contacts the braking pad. Over-rotating braking roller. 2. A guide member extending in the diametrical direction on the other side of the rotary wheel in the axial direction is provided with a mounting shaft projecting from one side of the rotary wheel in the axial direction so that the rotary wheel can be rotatably mounted on a mounted body. In addition to fixing, a pair of braking pads are mounted on the guide member so as to be slidable in the radial direction, and both braking pads and holding members fixed to the shaft center are connected by elastic bodies, respectively, and project on the mounted body. The braking plate of the braking member having a substantially L-shaped cross section is disposed orthogonally to the other side in the axial direction of the rotating wheel, and the braking pad is disposed in a circular hole formed in the braking plate. Over-rotating braking roller. 3. An over-rotation braking roller is attached to both side surfaces of the drawer and one of both inner surfaces of a housing body for storing the drawer, and a rail is attached to the other to guide the drawer to move forward and backward. The over-rotation braking roller includes a braking pad that rotates together with a rotating wheel and is displaced radially outward by a centrifugal force, and includes a non-rotating braking member having a circular inner surface that contacts the braking pad. Drawer device characterized by. 4. An over-rotation braking roller is attached to one of both sides of the drawer and one of the inner surfaces of the housing body for storing the drawer, and a rail is attached to the other for guiding the drawer to move back and forth. The over-rotation braking roller is provided with a mounting shaft projecting on one side in the axial direction of the rotary wheel for rotatably mounting the rotary wheel to the mounted body, and extends in the diametrical direction on the other side in the axial direction of the rotary wheel. While fixing the guide member,
A pair of braking pads are mounted on the guide member so as to be slidably displaced in the radial direction, and both braking pads and a holding member fixed to the shaft center are connected by an elastic body, respectively, and a cross-section is substantially L A withdrawing device, wherein a braking plate of a character-shaped braking member is disposed orthogonally to the other side in the axial direction of the rotating wheel, and the braking pad is disposed in a circular hole formed in the braking plate.