JPH10196718A - Shock and vibration absorbing device for business equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent overturning of business equipment itself in generation of an earthquake and an excessive shock or vibration and to prevent damage inside of the business equipment, spring-out of internal units and opening of doors and the like by decreasing acceleration given to the inside of the business equipment. SOLUTION: In a shock and vibration absorbing device of the business equipment which is a member enveloping at least 1 caster 42 from the outside and has a wheel stop (enveloping means) 1 with a conical tapered surface 2 and inside circumference wall 3 constructed on the outside circumference of the tapered surface 2 and a spring (braking means) 60 to control the movement of the wheel stop 1, an angle θ of the tapered surface 2 on the wheel stop 1 is set to be θ=2 deg.-20 deg.. As the angle θ of the tapered surface 2 on the wheel stop 1 is optimized by theoretical analysis of which velocity is confirmed by an experiment, big movement of a copying machine can be controlled and also overturning and damage of the copying machine, spring-out of internal units and cassettes, and opening of doors and covers can be prevented more effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock-vibration absorbing device for protecting office equipment such as a copying machine and a facsimile against an earthquake or excessive shock or vibration.

[0002]

2. Description of the Related Art Since the Great Hanshin Earthquake, social anxiety about the earthquake has spread.

FIGS. 5 to 9 show a conventional example of a shock and vibration absorbing device for protecting office equipment against an earthquake or excessive shock or vibration.
Shown in

FIG. 5 shows a copying machine 4 having a pedestal 46.
1 and a side view showing a wheel stopper 43 for restricting the movement of the copying machine 41, FIG. 6 is a sectional view of the structure of the wheel stopper 43, FIG. 7 is a plan view of the wheel stopper 43, and FIG. FIG. 9 and FIG. 9 are plan views of a conventional shock vibration absorber.

As shown in FIG. 5, an adjuster 44 having a screw portion 45 for adjusting the height of the entire apparatus and a wheel 42a for facilitating the movement of the apparatus are provided on the bottom of the pedestal 46. A caster 42 is provided.

Here, the configuration and installation procedure of a conventional shock / vibration absorber will be described.

In FIG. 5 and FIG.
Reference numeral 8 denotes a base plate fixed to the floor surface 50, and 60 denotes springs.
3 and the base plate 48. In addition, the wheel stopper 43,
The base plate 48 and the spring 60 are provided on all the casters 42, respectively.

As shown in FIGS. 7 to 9, the wheel stopper 43 is configured to be dividable.
a and 43b are connected to each other by a rotatable hinge 51, a fastening member 52 and a screw 53. The reason why the wheel chock 43 can be divided is as follows.
This is because the installation property of No. 3 is considered.

Next, the procedure for installing the wheel stopper 43 and the base plate 48 in the copying machine 41 will be described.

First, the base plate 48 is set at a predetermined position, and the copying machine 41 is mounted thereon. At this time, the wheels 42 a of the casters 42 of the copying machine 41 are positioned in the circular holes 65 formed in the center of the wheel stopper 43.

Next, as shown in FIG. 7, the wheel stopper 43 which is opened with the hinge 51 as a fulcrum is
To wear. And the divided piece 4 of the divided wheel stopper 43
After the coupling members 3a and 43b are connected to each other by the fastening member 52 and the screw 53, one end of the spring 60 is fixed to the wheel stopper 43 and the other end is fixed to the base plate 48 by a not-shown locking means. Installation is completed. At this time, the wheels 42 a of the casters 42 of the copying machine 41 are located in the circular holes 65 formed in the center of the wheel stopper 43.

When the floor 50 moves in the direction of arrow A in FIG. 6 due to an earthquake or the like, the copying machine 41 and the pedestal 4 are moved.
6 moves in the direction of arrow B with respect to the floor surface 50. As a result, the wheel 42a of the caster 42 rides on the tapered surface 59 over the step 56 formed inside the tapered surface 59 of the wheel stopper 43. At this time, the energy of shock or vibration is absorbed by the increase of the potential energy of the copying machine 41 and the rolling resistance of the caster 42. If the energy cannot be completely absorbed, the casters 42 abut against the inner wall 58 of the wheel stopper 43, and the wheel stopper 43 moves on the base plate 48.
It is absorbed by the elongation of 0 and the frictional resistance between the wheel stopper 43 and the base plate 48. Therefore, even if the energy of the earthquake is large, the energy is finally absorbed by the slip of the wheel stopper 43 and the base plate 48 and the extension of the spring 60.

As described above, according to the conventional shock / vibration absorber, after the energy is absorbed by the tapered surface 59 and the step 56 of the wheel stopper 43, the remaining energy is absorbed by the spring 60.
Of the copier 41
Can be prevented from overturning, breakage, and large movement.

In order to realize the above, the angle θ of the tapered surface 59 of the wheel stopper 43, the height H of the step 56, the diameter C of the tapered surface 59 of the wheel stopper 43, the base plate 48 and the wheel stopper 43 And the spring constant k of the spring 60 need to be set optimally.

First, the coefficient of friction μ and the spring constant k need to be set as large as possible within a range where the copying machine 41 does not overturn or be damaged, in order to keep the moving amount of the copying machine 41 small. However, the friction coefficient μ becomes unstable due to dust, water, oil, etc. on the floor surface 50. Therefore, the friction coefficient μ is set to a value as small as possible (if μ is a small value, even if μ changes by about 50% due to dust, water, oil, etc., the effect is small), and the function of absorbing the energy of the earthquake is considered. Is spring 6
You should rely on zero.

In general, the spring constant k should be a maximum value within a range that does not satisfy the following formula (breaking condition formula) and formula (falling condition formula).

Α _lim <α _max ··· m · g · W <m · α _max · h ·· m: mass (kg) of copying machine 41 g: gravitational acceleration (m / s ² ) W: from center of gravity G to caster 42 H: Height of the center of gravity G (m) α _lim : Limit value of acceleration (m / s ² ) at which copying machine 41 is not damaged or internal units jump out α _max : For copying machine 41 Maximum acceleration applied (m / s
² ) Here, the maximum acceleration α _max (m
/ S ² ) is generally represented by the following equation.

Α _max / g = μ + 4 · k · L / m L: the maximum amount of movement that the wheel stopper 43 can move within the base plate 48 Next, the height H of the step 56 and the angle θ of the tapered surface 59 will be described. explain.

The height H of the step 56 should be set as small as possible in terms of machining in order to reduce the impact when the wheel 42a of the caster 42 rides on the step 56.

The angle θ of the tapered surface 59 is determined by the copying machine 41
Needs to be set as large as possible in order to keep the moving amount of the moving object small. However, if the angle θ is too large, the wheel stopper 43 moves greatly when the wheels 42 a of the casters 42 ride on the tapered surface 59, so that the angle θ
Must be set appropriately.

Next, the diameter C of the tapered surface 59 of the wheel stopper 43 will be described.

As the diameter C increases, the diameter of the wheel stopper 43 increases.
Interferes with the adjuster 44, the operator's foot, etc., and when the size of the taper surface becomes smaller, the return effect of the tapered surface 59 (the effect of returning the copying machine 41 to the original position by the tapered surface 59) becomes smaller, and the moving amount of the copying machine 41 increases. Has properties. In consideration of this, the diameter C should be set as large as possible as long as the wheel stopper 43 does not interfere with the adjuster 44, the operator's foot, or the like.

Conventionally, the angle θ, the height H, the diameter C, the friction coefficient μ, and the spring constant k are set in consideration of the above, so that the copier 41 is prevented from tipping over, breakage and large movement.

[0024]

However, in the prior art, the means and concept for optimally setting the angle θ of the tapered surface 59 of the wheel stopper 43 are not clear, and the wheel 4 of the caster 42 is not clearly known.
When the wheel 2a collides with the inner peripheral wall 58 of the wheel stopper 43, the wheels 4
Since 2a receives a large shock from the inner peripheral wall 58, there is a possibility that the copying machine 41 may fall over or block the evacuation route depending on the magnitude of the earthquake, shock or vibration. Further, even when the copying machine 41 does not fall, there is a possibility that the acceleration applied to the inside of the copying machine 41 may damage the copying machine 41, cause the internal unit or cassette to fly out, or open the doors and covers. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent the office equipment itself from overturning when an earthquake or excessive shock or vibration occurs, and to reduce the acceleration applied inside the office equipment. Damage inside office equipment,
It is an object of the present invention to provide an impact vibration absorbing device for office equipment which can prevent internal units from jumping out and doors from opening.

[0026]

In order to achieve the above object, the invention according to claim 1 is an apparatus provided in office equipment having a plurality of casters and adjusters, wherein at least one caster or adjuster is provided from outside. Impact of an office machine having a wrapping member, including a mortar-shaped tapered surface and an inner peripheral wall erected on an outer peripheral portion of the tapered surface, and a brake means for restricting movement of the wrapping device. In the vibration absorbing device, the angle θ of the tapered surface of the inclusion means is set to θ = 2 ° to 20 °.

According to a second aspect of the present invention, in the first aspect of the present invention, the angle θ of the tapered surface of the inclusion means is set to θ = 3.
° to 10 °.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the wrapping means is provided with an impact mitigation means for alleviating an impact when the caster collides with the inner peripheral wall. And

According to a fourth aspect of the present invention, in the third aspect of the present invention, the shock absorbing means is constituted by an elastic member attached to an inner peripheral wall of the containing means.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the shock absorbing means is formed by an R surface continuously connecting the tapered surface and the inner peripheral wall of the containing means.

Therefore, according to the first or second aspect of the present invention, the angle θ of the tapered surface of the enclosing means is optimized by a theoretical analysis whose validity has been confirmed by an experiment, thereby suppressing a large movement of office equipment. In addition to the above, it is possible to more effectively prevent the office equipment from tipping over or being damaged, the internal units or cassettes from jumping out, and the doors and covers from being opened, as compared with the conventional case.

According to the third, fourth or fifth aspect of the present invention, since the shock absorbing means is provided in the enclosing means, the shock when the caster collides with the inner peripheral wall is mitigated, and the office equipment falls, breaks, and falls. Large movement, jumping out of internal units and cassettes, and opening of doors and covers can be more effectively prevented.

[0033]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> FIG. 1 is a side view of a copying machine provided with an impact vibration absorbing device according to the present invention, FIG. 2 is an enlarged sectional view of the impact vibration absorbing device according to the present invention, and FIG. FIG. 4 is a diagram showing the relationship between the taper angle of the office equipment and the movement amount and inclination angle of the office equipment.

The copying machine 41 shown in FIG. 1 is provided with a pedestal 46 at a lower portion thereof, and an adjuster 44 provided with a screw portion 45 at the bottom of the pedestal 46 to enable the height of the entire apparatus to be adjusted; Wheels 4 for easy movement
A caster 42 having 2a is provided.

Here, the configuration of the shock vibration absorbing device according to the present invention will be described.

1 and 2, reference numeral 1 denotes a wheel stopper formed of a resin material such as hard plastic, and 48 denotes a floor surface 5.
The base plate 60 fixed to 0 is a spring, and both ends of each spring 60 are locked to the wheel stopper 1 and the base plate 48 by means not shown. The wheel stopper 1, the base plate 48, and the spring 60 are provided on all the casters 42, respectively.

Incidentally, the wheel stopper 1 is configured to be dividable as in the prior art, and the divided pieces are connected to each other by a rotatable hinge, a fastening member, and a screw. Therefore, the installation procedure and the like of the impact vibration absorbing device are the same as those in the related art.

However, in the present embodiment, the angle θ of the tapered surface 2 of the wheel stopper 1 is optimized by a different idea from the conventional one. An elastic member 4 such as rubber is attached to the inner peripheral wall 3 of the wheel stopper 1 over the entire surface. In the present embodiment, the elastic member 4 as a separate member is attached to the inner peripheral wall 3 of the wheel stopper 1, but the wheel stopper 1 itself may be made of a material having elastic characteristics.

Thus, also in the shock vibration absorbing device according to the present embodiment, after the energy of the earthquake, shock or vibration is absorbed by the tapered surface 2 of the wheel stopper 1 and the step 56, the remaining energy is absorbed by the spring 60. And the slip of the wheel stopper 1 is absorbed to prevent the copier 41 from tipping over, breakage, and large movement.

That is, the wheel 42a of the caster 42 of the copying machine 41 is normally provided with a circular hole 6 formed in the center of the wheel stopper 1.
5 is located inside.

When the floor 50 moves in the direction of arrow C in FIG. 2 due to an earthquake or the like, the wheels 42a of the casters 42
Moves in the direction of arrow B. As a result, the wheel 42a rides on the step 56 and the tapered surface 2 formed inside the tapered surface 2 of the wheel stopper 1. Then, the energy of the earthquake or the like is absorbed by the increment of the potential energy of the copying machine 1 generated at this time and the rolling resistance of the caster 42. The wheel 42a is the inner peripheral wall 3 of the wheel stopper 1.
Collides with the elastic member 4 stuck on the base plate 48, and the elastic member 4 slides on the base plate 48.
All of the energy is absorbed by the frictional resistance between the spring and the base plate 48 and the extension of the spring 60.

As described above, in this embodiment, since the wheels 42a of the casters 42 collide with the elastic member 4 instead of the inner peripheral wall 3 of the wheel stopper 1, energy is effectively absorbed by the elastic deformation of the elastic member 4. Therefore, unlike the related art, the copying machine 41 does not receive a large impact.

In this embodiment, the angle θ of the tapered surface 2 of the wheel stopper 1 is optimized according to the following concept.

The angle θ of the tapered surface 2 of the wheel stopper 1 needs to be set as large as possible in order to keep the moving amount of the copying machine 41 small. However, if the angle θ is too large, the resistance received from the tapered surface 2 becomes too large, which may give a large impact to the copying machine 41 or cause the copying machine 41 to fall.

Therefore, in the present embodiment, the relationship between the angle θ and the amount of movement of the copying machine 41 and the inclination angle φ are obtained according to the following theoretical formula.

The theoretical formula is based on the following assumptions.

The theoretical model is a two-dimensional model in which horizontal two-dimensional motion is considered.

The acceleration of the earthquake is the same as the Kobe earthquake.

1) The position X ₂ of the caster 42 in the wheel stopper 1 and the inclination angle φ (when the wheel stopper 1 does not move); md ² X ₂ / dt ² = −m · α · g + f ₁ (t, X
₂ , θ) m · h · d ² φ / dt ² = −m · g · W + R ₁ (t, X
_{2, θ) 2)} tilt and the position X ₁ of the spokes 1 to the floor surface ^{50 φ; m · d 2 X} 1 / dt 2 = -m · α · g + f 1 (t, X
₁ , θ) m · h · d ² φ / dt ² = −m · g · W + R ₁ (t, X
₁ , θ) 3) Position X of caster 42 with respect to floor 50; X = X ₁ + X ₂ where m: mass of copying machine 41 (kg) t: time (s) α: acceleration of earthquake (m / s) ² ) g: gravitational acceleration (m / s ² ) f ₁ (t, X ₁ ): resistance force (N) that the caster 42 receives from the tapered surface 2 of the wheel stopper 1 and the like h: height of the center of gravity G of the copying machine 41 (M) W: horizontal distance (m) between the center of gravity G of the copying machine 41 and the caster 42 part R ₁ (t, X ₁ ): moment (Nm) generated by a horizontal force applied to the caster 42 part By solving, the relationship between the angle θ of the tapered surface 2 of the wheel stopper 1 and the movement amount of the copying machine 41 and the inclination angle φ can be theoretically obtained. 3 (a) and 3 (b) show the results.

In FIG. 3A, the horizontal axis represents the angle (taper angle) θ of the tapered surface 2 of the wheel stopper 1, and the vertical axis represents the copying machine 41.
And the limit movement amount (the movement amount of the copying machine 41 that does not block the general office passage (evacuation route)). In FIG. 3B, the horizontal axis indicates the angle (taper angle) θ of the tapered surface 2 of the wheel stopper 1, and the vertical axis indicates the inclination angle of the copying machine 41 and the limit inclination angle (the falling angle of a general copying machine). ).

3A and 3B, if the angle θ of the tapered surface 2 of the wheel stopper 1 is 2 ° to 20 °, the copying machine 41
Both at the same time and the evacuation route can be blocked,
In particular, it can be seen that if θ = 3 ° to 10 °, both the moving amount of the copying machine 41 and the inclination angle φ can be minimized.

Accordingly, the angle (taper angle) θ of the tapered surface 2 of the wheel stopper 1 is ideally θ = 3 ° to 10 °, and the copying machine 41
It can be seen that θ = 2 ° to 20 ° should be satisfied in order to satisfy the necessary minimum conditions regarding the amount of movement and the inclination angle φ.

The impact acting on the copying machine 41 is
Since the maximum impact is applied when the tilted copying machine 41 lands, the impact applied to the inside increases when the tilt angle φ of the copying machine 41 is large. Even in consideration of the impact acting on the machine, the angle (taper angle) θ of the tapered surface 2 of the wheel stopper 1 may satisfy the above value.

FIG. 3A and FIG. 3B show that the inventor conducted a vibration experiment in which vibration was applied to actual office equipment.
It was confirmed that the results of the theoretical analysis shown in (1) were appropriate.

Based on the above-described study, in the present embodiment, the intermediate value of the taper angle θ = 3 ° to 10 ° at which the moving amount of the copying machine 41 and the inclination angle φ becomes the smallest is adopted, and θ = 6. .
It was set at 5 °.

As described above, in the present embodiment, the wheel stopper 1
The angle (taper angle) θ of the tapered surface 2 was optimized by theoretical analysis, whose validity was confirmed by experiments, and the elastic member 4 was attached to the inner peripheral wall 3 of the wheel stopper 1.
The large movement of the copying machine 41 can be suppressed, and the overturning and breakage of the copying machine 41, the jumping out of internal units and cassettes, and the opening of doors and covers can be more effectively prevented as compared with the related art.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of the shock-vibration absorbing device according to Embodiment 2 of the present invention. In FIG. 4, the same elements as those shown in FIG. 2 are denoted by the same reference numerals. Description is omitted.

In this embodiment, the elastic member 4 (see FIG. 2) used in the first embodiment is omitted, and the tapered surface 2 and the inner peripheral wall 3 of the wheel stopper 1 are rounded (R-shaped concave surface).
11 are connected continuously, and the other configuration is the same as that of the first embodiment.

Thus, in the present embodiment, the cat
The impact when the second wheel 42a collides with the inner peripheral wall 3 is mitigated by the R-plane (concave curved surface) 11, so that the same effects as those of the first embodiment can be obtained, and the second embodiment is used in the first embodiment. Since the elastic member 4 can be omitted, the number of parts can be reduced and cost can be reduced.

[0061]

As is apparent from the above description, claim 1
According to the invention described in (2), the angle θ of the tapered surface of the enclosing means is optimized by theoretical analysis whose validity has been confirmed by an experiment, so that large movement of office equipment can be suppressed and compared with the conventional one. As a result, it is possible to more effectively prevent office equipment from overturning or being damaged, internal units and cassettes from jumping out, and doors and covers from being opened.

According to the third, fourth or fifth aspect of the present invention, since the shock absorbing means is provided in the enclosing means, the shock when the caster collides with the inner peripheral wall is mitigated, and the office equipment can be overturned, broken and damaged. It is possible to more effectively prevent large movement, jumping out of internal units and cassettes, and opening of doors and covers.

[Brief description of the drawings]

FIG. 1 is a side view of a copying machine including an impact vibration absorbing device according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the shock vibration absorbing device according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a relationship between a taper angle of a wheel stopper of the shock vibration absorbing device according to Embodiment 1 of the present invention and a movement amount and a tilt angle of office equipment.

FIG. 4 is a sectional view of an impact vibration absorbing device according to Embodiment 2 of the present invention.

FIG. 5 is a side view of a copying machine provided with a conventional shock vibration absorbing device.

FIG. 6 is a cross-sectional view showing a configuration of a wheel stopper of a conventional shock vibration absorbing device.

FIG. 7 is a plan view of a wheel stopper of a conventional shock vibration absorbing device.

FIG. 8 is a perspective view of a wheel stopper of the conventional shock vibration absorbing device.

FIG. 9 is a plan view of a conventional shock vibration absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel stopper (inclusion means) 2 Tapered surface 3 Inner peripheral wall 4 Elastic member (impact mitigation means) 11 R surface (impact mitigation means) 41 Copy machine (office equipment) 42 Caster 44 Adjuster 50 Floor surface 60 Spring (brake means)

Claims (5)

[Claims] 1. An apparatus provided in office equipment having a plurality of casters and adjusters, wherein the member wraps at least one caster or adjuster from outside, and comprises a mortar-shaped tapered surface and an outer peripheral portion of the tapered surface. In an impact vibration absorbing device for office equipment having a containing means having an inner peripheral wall standing upright and a brake means for restricting the movement of the containing means, the angle θ of the tapered surface of the containing means is θ = 2 ° An impact / vibration absorber for office equipment, wherein the angle is set to 20 °. 2. The angle θ of the tapered surface of the inclusion means is defined as θ =
2. The shock vibration absorber for office equipment according to claim 1, wherein the angle is set to 3 to 10 degrees. 3. The shock vibration absorbing device for office equipment according to claim 1, wherein said wrapping means is provided with a shock mitigation means for reducing a shock when said caster collides with an inner peripheral wall. . 4. The shock vibration absorbing device for office equipment according to claim 3, wherein said shock absorbing means is constituted by an elastic member attached to an inner peripheral wall of said containing means. 5. The shock vibration absorbing device for office equipment according to claim 3, wherein said shock absorbing means is constituted by an R surface continuously connecting a tapered surface of said containing means and an inner peripheral wall.