Seismic structure of a mobile rack

Abstract

To provide an earthquake-resistant structure for movable racks that can prevent runaway during earthquakes and has a simple configuration.SOLUTION: An earthquake-resistant structure of movable racks of the present invention is provided with: an interlocking gear 93 that rotates in conjunction with the rotation of a wheel 91; a movable member that is movable between an actuated state and a non-actuated state; a rotary damper 4 fixed to the movable member and used for applying a braking force; a braking gear 1 fixed to the rotary damper 4, which is separated from the interlocking gear 93 when the movable member is in the non-actuated state and engages with the interlocking gear when it is in the actuated state; and holding means to hold the movable member in the non-actuated state. When vibration occurs, the holding by the holding means is released, and the movable member shifts from the non-actuated state to the actuated state, and the braking gear 1 engages with the interlocking gear 93, thereby applying the braking force of the rotary damper 4 to the wheel 91.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present invention relates to an earthquake-resistant structure for a movable rack that is configured to be freely movable via wheels. [Background technology]

[0002] Mobile racks installed in offices, libraries, factories, warehouses, etc. are well known in the art, and include electric types that move when a button is pressed, and manual types that move when a handle is turned or pulled.

[0003] In a handle-type mobile rack facility, multiple mobile racks are mounted on wheels on rails laid on an installation surface such as a floor, and the mobile racks are moved appropriately by operating the handle to form an aisle between adjacent mobile racks, and items can be placed in and removed from the desired mobile rack via this aisle.

[0004] In such mobile rack facilities, if a mobile rack moves carelessly while a worker is working in an aisle, the worker may be pinched by the mobile rack, so each mobile rack is provided with a locking device to prevent it from moving carelessly. However, if an earthquake or the like occurs while the mobile rack is in the locked state, there is a risk that the mobile rack may fall over.

[0005] To address this issue, mobile racks equipped with an unlocking device have been developed so that the lock can be released and the racks can move freely in the event of an earthquake.

[0006] However, if the mobile rack is unlocked and allowed to move freely in the event of an earthquake, the mobile rack may run out of control, causing an unexpected accident.

[0007] Therefore, as shown in the following Patent Documents 1 and 2, technology has been proposed to apply a braking force to the rotating wheels of a mobile rack when an earthquake occurs, appropriately suppressing the rack's traveling motion to prevent runaway, thereby further improving safety during earthquakes.

[0008] For example, in the earthquake-resistant structure of the mobile rack shown in Patent Document 1, at the time of an earthquake, a resistor is brought into contact with a rotating body interlocked with the wheels, and braking force is applied by the frictional resistance to prevent runaway.

[0009] Also, in the earthquake-resistant structure of the mobile rack shown in Patent Document 2, a rotary damper is fixed to a pivot that transmits the operating force of the handle, and at the time of an earthquake, the braking force of the rotary damper is activated to prevent runaway.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0011] However, in the conventional earthquake-resistant structure of the mobile rack shown in Patent Document 1, since braking force is applied to the traveling wheels by the frictional resistance of the resistor against the rotating body, in order to obtain desired braking characteristics, fine adjustment of the pressing force (contact pressure) of the resistor against the rotating body is required, resulting in the problem of increased structural complexity.

[0012] Also, in the conventional earthquake-resistant structure of the mobile rack shown in Patent Document 2, since a rotary damper is fixed to the pivot that transmits the operating force of the handle, even when the mobile rack is traveling during normal times other than during an earthquake, the rotary damper will also rotate by the handle operation, and a load for rotating the rotary damper will also be added to the handle operation, resulting in the problem of reduced operability during traveling.

[0013] The present invention has been made in view of the above problems, and an object thereof is to provide a seismic-resistant structure for a mobile rack that can appropriately suppress the running of the mobile rack during an earthquake to prevent runaway, simplify the structure, and improve the operability during running.

Means for Solving the Problems

[0014] To solve the above problems, the present invention comprises the following means.

[0015] [1] A seismic-resistant structure for a mobile rack that is movable via wheels, comprising: An interlocking gear that rotates in conjunction with the rotation of the wheels; A movable member that is movable between an operating state and a non-operating state; A rotary damper that is fixed to the movable member and imparts a braking force; A braking gear that is fixed to the rotary damper and is separated from the interlocking gear when the movable member is in the non-operating state and meshes with the interlocking gear when the movable member is in the operating state; Retention means for holding the movable member in the non-operating state; Vibration detection means for detecting vibration, and is configured such that, based on the detection of vibration by the vibration detection means, the retention by the retention means is released, the movable member shifts from the non-operating state to the operating state, and the braking gear meshes with the interlocking gear, whereby the braking force of the rotary damper is applied to the wheels. A seismic-resistant structure for a mobile rack, characterized by the above.

[0016] [2] The movable member is constituted by a swing member pivotally supported on the lower end side, the retention means is configured to hold the swing member in a state where its self-rotation is restricted, and the swing member rotates by its own weight when the retention by the retention means is released, and the braking gear meshes with the interlocking gear. The seismic-resistant structure for a mobile rack according to item 1 above.

[0017] ​​​[3] The movable member is provided with a stopper pin that can protrude, The support member that supports the movable member movably is provided with a positioning hole corresponding to the stopper pin, In the operating state of the movable member, the stopper pin protrudes and is inserted into the positioning hole, so that the engaged state is maintained. The seismic structure of the moving rack according to item 1 or 2 of the preceding paragraph.

[0018] [4] A cover panel is provided so as to cover the movable member, and a display window is provided on the cover panel, A display plate that moves following the movable member is provided on the movable member, The display plate is provided with an operating display area that can be recognized visually, In the operating state of the movable member, the operating display area is arranged at a position corresponding to the display window, and the operating display area is configured to be recognizable through the display window. On the other hand, In the non-operating state of the movable member, the operating display area is arranged at a position deviated from the display window, and the operating display area is configured to be unrecognizable through the display window. The seismic structure of the moving rack according to any one of items 1 to 3 of the preceding paragraph.

Effect of the Invention

[0019] According to the seismic structure of the moving rack of Invention [1], since a braking force is applied to the wheels by the rotary damper when vibration occurs, desired braking characteristics can be obtained, the runaway of the moving rack can be prevented, and compared with the structure that applies a braking force by contact friction resistance as in the prior art, the structure can be simplified. Further, in the seismic structure of the present invention, in the normal state, since the rotary damper is disengaged from the interlocking gear interlocked with the wheels, the load for rotating the rotary damper can be omitted during normal running, and the operability during running can be improved.

[0020] According to the seismic structure of the moving rack of Invention [2][3], the above effects can be obtained more reliably.

[0021] According to the earthquake-resistant structure of the mobile rack of the invention [4], in the operating state where the braking force of the wheels is applied, the operating display area is displayed in the display window, so that the operator can accurately grasp that it is in the operating state and can appropriately respond according to the current situation.

Brief Description of the Drawings

[0022]

Figure 1

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Figure 8B

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BEST MODE FOR CARRYING OUT THE INVENTION

[0023] Figure 1 is a front view showing a moving rack to which the seismic structure according to the embodiment of the present invention is applied. As shown in the figure, this moving rack includes a rack body 9 and traveling wheels 91 provided at the lower end of the rack body 9. The wheels 91 are installed on a rail (not shown), and the rack body 9 as a moving rack is configured to be able to travel along the rail by rolling on the rail.

[0024] In the following description, for the sake of easy understanding of the invention, the width direction of the moving rack, that is, the direction perpendicular to Figure 1, is referred to as the "front-rear direction" or "front-back direction", the front side thereof is referred to as the "front side" or "front surface side", and the depth side is referred to as the "rear side" or "back surface side" for explanation. Further, the traveling direction (the left-right direction in Figure 1) is referred to as the "left-right direction" or "both-side direction" for explanation.

[0025] Needless to say, mobile racks are not usually used alone. Instead, multiple mobile racks are arranged in parallel in the traveling direction and installed as mobile rack facilities at sites such as warehouses and libraries.

[0026] As shown in FIG. 1, a frame 90 as a structural member provided on the front side (front surface side) of the rack body 9 has a lip groove shape with an open front side (see FIG. 2B etc.), and a cover panel 95 is attached so as to cover the front side of the frame 90. A handle 92 is provided on the front side of this cover panel 95. Further, a sprocket 93 as an interlocking gear is rotatably supported at the lower part inside the frame 90 of the rack body 9, and is configured such that the rotational force of this sprocket 93 is transmitted to the wheel 91. Further, a chain 94 is bridged between the rotation axis of the handle 92 and the sprocket 93. Thus, when an operator rotates the handle 92, the rotational force is transmitted to the wheel 91 via the chain 94 and the sprocket 93, and the mobile rack is configured to be able to travel on the rail.

[0027] As shown in FIG. 1, a braking mechanism P for applying a braking force to the wheel 91 during an earthquake is provided at the lower part of the frame 90 in the rack body 9 as will be described in detail below.

[0028] FIG. 2A is a front sectional view for explaining the braking mechanism P in the normal state of the mobile rack of the present embodiment, FIG. 2B is a sectional view taken along line 2B-2B of FIG. 2A, FIG. 3A is a front sectional view for explaining the braking mechanism P in the braking state (operating state) of the mobile rack of the embodiment, FIG. 3B is a sectional view taken along line 3B-3B of FIG. 3A, FIG. 4 is a side sectional view for explaining the braking mechanism P in the normal state of the mobile rack of the embodiment, and FIG. 5 is a perspective view showing the main part of the braking mechanism P of the embodiment disassembled.

[0029] As shown in these figures, in this embodiment, the braking mechanism P as a seismic-resistant structure includes a braking gear 1, a base plate 2, a brake plate 3 as a movable member and a swing member, a rotary damper 4, a seismic sensor 5 as a vibration detection means, and a display plate 6 as basic components.

[0030] Both side portions of the base plate 2 are attached to both side lip portions of the frame 90 of the rack body 9, and the position thereof is fixed with respect to the rack body 9.

[0031] The upper end portion of the base plate 2 is formed in an inverted V shape that is wider than the lower end portion. An arcuate first guide hole 21 is formed in the middle portion in the vertical direction, and an arcuate second guide hole 22 is formed at a position closer to one side (the left side in FIG. 2A) above the first guide hole 21.

[0032] A base auxiliary plate 20 is fixed to the back side (inner surface side) of the base plate 2 so as to close the second guide hole 22. Further, a circular positioning hole 23 is formed in the base auxiliary plate 20 corresponding to one end side (the left end side in FIG. 2A) of the second guide hole 22.

[0033] One-sided magnet 7a is attached to the center of the upper end of the base auxiliary plate 20 via a mounting fitting 71a. This magnet 7a is arranged toward the front side (outer surface side) and constitutes a holding means together with the other-sided magnet 7b described later.

[0034] The lower end portion of the brake plate 3 is rotatably attached to the lower end portion of the base plate 2 via a shaft member 30. Thereby, the brake plate 3 is configured to be swingable by rotating about the axis of the shaft member 30 as a fulcrum.

[0035] As shown in FIG. 5, a shaft insertion hole 31 is formed in the central portion of the brake plate 3. Further, a rotary damper 4 is fixed to the front side of the brake plate 3 corresponding to the shaft insertion hole 31.

[0036] The rotary damper 4 includes a case fixed to the brake plate 3, oil (viscous fluid) filled in the case, and a rotor rotatably attached to the case while being immersed in the oil. Against the rotational force of the rotor, braking force is applied by the viscous resistance of the oil so that the rotation of the rotor can be suppressed.

[0037] The axial center part of the rotor of this rotary damper 4 is arranged corresponding to the shaft insertion hole 31 of the brake plate 3. And the front end of the shaft member 40 inserted and arranged in the first guide hole 21 of the base plate 2 and the shaft insertion hole 31 of the brake plate 3 is fixed to the axial center of the rotor on the back side of the rotary damper 4. Further, the rear end of this shaft member 40 is fixed to the axial center of the braking gear 1. Therefore, it is configured such that braking force by the rotary damper 4 can be applied to the rotational force of the braking gear 1 via the shaft member 40.

[0038] The braking gear 1 rotatably attached to the brake plate 3 is in a separated state from the sprocket 93 interlocked with the wheel 91 when the brake plate 3 is vertically arranged (non-operating state) as shown in FIGS. 2A and 2B. And when the brake plate 3 is tilted (operating state) as shown in FIGS. 3A and 3B, the braking gear 1 comes close to and engages with the sprocket 93.

[0039] In this embodiment, the case of the rotary damper 4 is fixed to the brake plate 3 and the rotor is fixed to the braking gear 1 side, but it is not limited thereto. In the present invention, the rotor of the rotary damper 4 may be fixed to the brake plate 4 and the case may be fixed to the braking gear 1 side.

[0040] Also, on the upper end of the brake plate 3, the other magnet 7b is attached via a mounting fitting 71b. This other magnet 7b is arranged facing the back side (inner surface side). In the non-operating state where the brake plate 3 is arranged in a vertical posture, this other magnet 7b is arranged in a state of facing the one magnet 7a on the base plate 2 side at a short distance. In this state, unless an appropriate external force acts, the vertical posture of the brake plate 3 is configured to be maintained by the magnetic attraction force between the magnets 7a and 7b. Therefore, as described above, the magnets 7a and 7b constitute a holding means for holding the brake plate 3 in the non-operating state.

[0041] Above the other magnet 7b at the upper end of the brake plate 3, a passive member 75 linked to the shock sensor 5 is fixed. This passive member 75 is formed in a substantially V shape that opens toward the front side in a plan view, and both pieces of its V shape are formed to spread to the left and right sides as they face the front side. In this embodiment, only one piece on one side (the right side in FIG. 2B) of both side pieces of the passive member 75 is used as the inclined portion 76, while the other piece on the other side (the left side in the same figure) is not used.

[0042] Above the shaft insertion hole 31 on the surface side of the brake plate 3, a block-shaped pin holder 34 is fixed, and a stopper pin 35 is arranged in a state facing the back side so as to penetrate the pin holder 34 and the brake plate 3 slidably. The stopper pin 35 is biased by a spring 36 (see FIG. 5) provided in the pin holder 34 to protrude toward the back side. In the normal state, the stopper pin 35 is arranged to contact the surface of the base plate 2 by the biasing force of the spring 36. The tip of the stopper pin 35 is constituted by a ball that can roll, and this ball is in contact with the surface of the base plate 2 in a state where it can roll.

[0043] When the brake plate 3 swings and rotates counterclockwise from the vertical posture shown in FIGS. 2A and 2B to the tilted posture shown in FIGS. 3A and 3B, the stopper pin 35 moves while rolling and contacting along the surface of the base plate 2. Then, the tip of the stopper pin 35 drops into the second guide hole 22 and moves further along the second guide hole 22. When it reaches the positioning hole 23, the stopper pin 35 protrudes by the biasing force of the spring 36 and is inserted into the positioning hole 23. In this state, the brake plate 3 is positioned (locked) in the tilted posture, and the brake gear 1 that has swung and rotated together with the brake plate 3 meshes with the sprocket 93, and the sprocket 93 is connected to the rotary damper 4 via the brake gear 1. Therefore, the braking force of the rotary damper 4 acts on the rotation of the sprocket 93, that is, the rotation of the wheel 91.

[0044] On the surface side of the brake plate 3, a display plate 6 is fixed so as to cover the rotary damper 4 and the pin holder 34 from the surface side. The display plate 6 is configured to swing in conjunction with the brake plate 3. A substantially one-sided half region (the region shown by hatching in FIG. 5) on the upper surface of the display plate 6 is configured as an operating display region 61 by being subjected to a coloring process with a conspicuous color such as red, and the remaining region is configured as a normal display region 62 by being subjected to a color that is not conspicuous, for example, a color of the same system as the outer surface of the moving rack.

[0045] As shown in FIGS. 1, 7A, and 7B, in a cover panel 95 that covers the surface side of the rack body 9, an arc-shaped display window 60 is formed corresponding to the movement locus of the stopper pin 35 within the region where the display plate 6 is disposed. And in the present embodiment, as shown in FIG. 7A, when the brake plate 3 is in the vertical posture (non-operating state), the normal display region 62 of the display plate 6 is disposed corresponding to the display window 60. By recognizing the normal display region 62 through the display window 60, that is, by being unable to recognize the operating display region 61, the operator can surely grasp that the brake plate 3 is in the non-operating state. Further, as shown in FIG. 7B, when the brake plate 3 is in the tilted posture (operating state), the operating display region 61 of the display plate 6 is disposed corresponding to the display window 60. By recognizing the operating display region 61 through the display window 60, the operator can surely grasp that the brake plate 3 is in the operating state.

[0046] Also, at the base end portion (surface side end portion) of the stopper pin 35, the tip of the shaft portion of the knob 65 is connected, and the shaft portion is inserted and disposed in the display window 60, and the main body portion (operation portion) of the knob 65 is disposed outside (surface side) of the cover panel 95. Therefore, the operator can grasp the knob 65 from the outside of the moving rack and perform a retracting operation or a sliding operation as required.

[0047] As described above, since the display window 60 is formed along the movement locus of the stopper pin 35, the knob 65 is configured to move along the display window 60 as the brake plate 3 swings. Therefore, when the brake plate 3 is in the vertical posture (non-operating state), as shown in FIG. 7A, the knob 65 is disposed at the right end position in the display window 60 in the figure, and when in the tilted posture (operating state), as shown in FIG. 7B, the knob 65 is disposed at the left end position in the display window 60 in the figure.

[0048] FIG. 2C is a cross-sectional view taken along line 2C-2C of FIG. 2A, corresponding to a horizontal cross-section around the seismic sensor 5, FIG. 6A is a perspective view showing the seismic sensor 5 disassembled, and FIG. 6B is a side cross-sectional view showing the seismic sensor 5. As shown in these figures, the seismic sensor 5 is provided corresponding to above the base plate 2 in the frame 90 of the rack body 9. This seismic sensor 5 basically includes an outer fitting 51, an inner fitting 52, a support shaft 53, a weight body 54 as a weight, and a pushing member 55.

[0049] The outer fitting 51 has a box-shaped configuration with the lower side and the proximal side (rear end side) open, and flanges 511 are provided above and on both sides of the proximal side. And this flange 511 is fixed to the frame 91 of the rack body 9.

[0050] Also, the inner fitting 52 is fixed to the inner surface of the upper wall of the outer fitting 51, and has a downward bent piece 521 bent downward at the proximal side (rear end side). This downward bent piece 521 is disposed corresponding to the proximal side opening of the outer fitting 51.

[0051] Also, the support shaft 53 is attached so as to be spanned between the front wall of the outer fitting 51 and the downward bent piece 521 of the inner fitting 52.

[0052] Furthermore, the weight body 54 is formed by overlapping a plurality of fan-shaped metal plates, and the upper end portion of this weight body 54 is attached to the support shaft 53 so as to be swingable and rotatable around its axis and slidable in the axial direction of the support shaft 53.

[0053] Furthermore, the pushing member 55 is fixed to the front surface of the weight body 54 via the support shaft 53. This pushing member 55 is configured to be swingable and slidable in conjunction with the weight body 54.

[0054] Although not shown, the seismic sensor 5 is provided with biasing means for biasing the weight 54 and the pushing member 55 from both sides along the front-rear direction (width direction), which is the axial direction. In the normal state, the weight 54 and the pushing member 55 are held at a position where the biasing forces of the biasing means on both sides balance, that is, at the intermediate position of the support shaft 53. In other words, the weight 54 and the pushing member 55 are configured to be movable in the front-rear direction against the biasing means on both sides.

[0055] As a result, the weight 54 can detect vibrations in the running direction (left-right direction) of the moving rack by swinging around the axis, and can also detect vibrations in the width direction (front-rear direction) of the moving rack when the weight 54 moves in the axial direction.

[0056] The pushing member 55 in the seismic sensor 5 is provided with a contact portion 551 that extends forward (tip side) at a position below the outer metal fitting 51. In the normal state, the tip of the contact portion 551 is disposed to face the inclined portion 76 of the passive member 75 provided at the upper end of the brake plate 3.

[0057] As a result, in the normal state (non-operating state) shown in FIGS. 2A and 4, when the weight 54 and the pushing member 55 of the seismic sensor 5 swing around the axis to detect seismic vibrations in the rack running direction (left-right direction), the inclined portion 76 of the passive member 75 is pushed in the same direction by the contact portion 551 of the pushing member 55, the magnetic attraction between the two magnets 7a and 7b is released, the brake plate 3 swings in the same direction (counterclockwise in FIG. 2A), and the braking gear 1 engages with the sprocket 93 as shown in FIGS. 3A and 3B, and is locked by the insertion and engagement of the stopper pin 35 into the positioning hole 23 in that state (operating state).

[0058] Also, in the non-operating state shown in FIGS. 2A and 4, when the weight 54 and the pushing member 55 of the seismic sensor 5 move along the axis to detect ground motion in the rack opening direction (front-rear direction), the contact portion 551 of the pushing member 55 moves along the inclined portion 76 of the passive member 75, and thus the passive member 75 is pushed into the rack running direction in the same manner as described above. Therefore, the magnetic adsorption between the two magnets 7a and 7b is released, the brake plate 3 swings counterclockwise in FIG. 2A, and the braking gear 1 engages with the sprocket 93 as shown in FIGS. 3A and 3B. In this state (operating state), the stopper pin 35 advances by the biasing force of a spring (not shown) and is locked by being inserted into and engaged with the positioning hole 23.

[0059] Also, when the brake plate 3 thus shifts from the non-operating state (normal state) to the operating state, the display plate 6 attached to the brake plate 3 also rotates following the brake plate 3, and the operating-time display area 61 of the display plate 6 is arranged corresponding to the display window 60 of the cover panel 95 as shown in FIG. 7B. That is, the information displayed in the display window 60 switches from the normal-time display area 62 to the operating-time display area 61.

[0060] Furthermore, when shifting from the normal state to the operating state, as shown in FIGS. 7A and 7B, the knob 65 arranged outside (forward) via the display window 60 also rotates together with the brake plate 3 and moves from the position at the right end to the position at the left end of the display window 60.

[0061] As described above, in the moving rack of the present embodiment, when vibration due to an earthquake is detected, the brake plate 3 tilts (operates) and the rotary damper 4 is connected to the sprocket 93 via the braking gear 1. Thereby, the braking force by the rotary damper 4 acts on the wheel 91, and it is possible to prevent the moving rack from running wild, and the safety during an earthquake can be further improved.

[0062] Also, in the mobile rack of the present embodiment, in the normal state where the brake plate 3 is vertically arranged, for a power transmission mechanism that transmits the operating force (driving force) of the handle 92 to the wheel 91, for example, a chain 94, a sprocket 93, and a gear (not shown) between the sprocket 93 and the wheel 91, etc., since the rotary damper 4 is disengaged and arranged, the rotary damper 4 does not rotate in conjunction during the handle operation when driving normally. Therefore, the load for rotating the rotary damper 4 during the handle operation can be omitted, and the operability during driving can be improved.

[0063] Also, in the mobile rack of the present embodiment, since the rotary damper 4 is used to apply braking force, there is no need to adopt a complicated mechanism that applies braking force by contact friction resistance to the rotating body. While simplifying the structure and reducing costs, appropriate braking characteristics can be obtained.

[0064] Also, in the present embodiment, in the state where the brake plate 3 is actuated and tilted, since the operation display area 61 of the display plate 6 is arranged corresponding to the display window 60 of the cover panel 95, the operator can recognize the operation display area 61 through the display window 60 and accurately grasp that the brake plate 3 is in the actuated state. Therefore, the operator can take appropriate actions according to the situation. For example, it is possible to surely prevent problems such as forcibly driving the mobile rack while the braking force is applied to the wheel 91, and the return operation and the like described below can be performed smoothly.

[0065] Also, in the present embodiment, since the second guide hole 22 is provided in the base plate 2, when the brake plate 3 swings, the stopper pin 35 of the brake plate 3 is guided along the second guide hole 22 and can be smoothly inserted into the positioning hole 23 of the base auxiliary plate 20. Furthermore, even if the timing is off and the brake gear 1 bounces off when engaging with the sprocket 90, since the stopper pin 35 is held within the second guide hole 22, the brake gear 1 repeatedly abuts against the sprocket 90 until it engages with the sprocket 90, ensuring that the brake gear 1 engages with the sprocket 90 reliably. Therefore, it is possible to surely prevent the problem that the brake plate 3 that has swung in the tilting direction inadvertently returns to the vertical position and returns to the initial position due to the magnetic adsorption of the magnets 7a and 7b, and high operational reliability can be ensured.

[0066] On the other hand, to perform a return operation to return the moving rack in the operating state to the normal state (non-operating state), pinch and pull the knob 65 arranged to protrude outward (front side) at the left end position of the display window 60, and retract the stopper pin 35 against the biasing force of a spring (not shown). As a result, the stopper pin 35 is pulled out from the positioning hole 23 of the base auxiliary plate 20 and the engagement is released, releasing the lock on the swinging motion of the brake plate 3. After releasing the lock, move the knob 65 from the left end position to the right end position along the display window 60 to return the brake plate 3 from the tilted position (operating state) to the vertical position (normal state). Thereby, the brake gear 1 returns to its original position and disengages from the sprocket 93. By returning the brake plate 3 to its original state in this way, the two magnets 7a and 7b magnetically adsorb, and the brake plate 3 is held in the normal state (initial state). Thereby, the moving rack can be returned from the operating state to the normal state.

[0067] FIG. 8A is a front sectional view for explaining a braking mechanism P in a normal state in a moving rack which is a first modification of the present invention, FIG. 8B is a horizontal sectional view around a passive member in the moving rack of FIG. 8A, FIG. 8C is a side sectional view for explaining the braking mechanism P in the moving rack of the first modification, and FIG. 9 is a front sectional view for explaining the braking mechanism P in an operating state in the moving rack of the first modification.

[0068] As shown in these figures, in the braking mechanism P of the moving rack of this first modification, a pendulum type of seismoscope 5 in which the pendulum swings in the running direction and the front-rear direction is used, and this point is greatly different from the braking mechanism P of the first embodiment.

[0069] That is, in the braking mechanism P of the moving rack of this first modification, the upper end of a suspension rod 57 is swingably attached above a brake plate 3 via a mounting fitting 56. The suspension rod 57 is configured to be swingable in the entire horizontal direction including the front-rear direction (front-rear direction) and the left-right direction (running direction) with the upper end as a fulcrum.

[0070] A weight body 54 is fixed to the lower end of the suspension rod 57, and a pushing member 55 is attached to the lower end of the weight body 54 so as to extend downward.

[0071] On one side, a passive member 75 is attached to the upper end of the brake plate 3 so as to protrude rearward, and a portion of the passive member 75 corresponding to the pushing member 55 is diagonally cut away to provide an inclined portion 76. This inclined portion 76 is inclined so as to be gradually positioned from the left side to the right side of FIG. 8B as it goes from the rear (the upper side in FIG. 8B) to the front (the lower side in FIG. 8B). No matter from which direction the pushing member 55 abuts against this inclined portion 76, the abutting force acts to push the passive member 75 in the left direction of the figure. For example, when the weight body 54 swings in the traveling direction (the left-right direction in the figure) and the pushing member 55 presses the inclined portion 76 in the left direction, the passive member 75 is pushed in the same direction via the inclined portion 76. Also, when the weight body 54 swings in the width direction (the up-down direction in the figure) and the pushing member 55 presses the inclined portion 76 in the downward direction, the pushing member 55 moves downward along the inclined portion 76, whereby the passive member 75 is pushed in the left direction.

[0072] Therefore, when vibrations occur due to an earthquake, similar to the above-described embodiment, the weight body 54 of the seismic sensor 5 swings, and the pushing member 55 pushes in the passive member 75, whereby the adsorption between the two magnets 7a and 7b is released, and the brake plate 3 swings and shifts from the normal state to the operating state and is locked.

[0073] In this first modification, since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same or corresponding parts, and redundant descriptions are omitted.

[0074] The moving rack of this first modification also has the same effect as the moving rack of the above-described embodiment.

[0075] In the above-described embodiments and the like, the second guide hole 22 is provided in the base plate 2, and when the brake plate 3 swings, the stopper pin 35 provided on the brake plate 3 is guided along the second guide hole 22 and inserted into the positioning hole 23 of the base auxiliary plate 20. However, the second guide hole 22 is not necessarily provided. For example, the positioning hole 23 may be directly formed in the base plate 2, and when the brake plate 3 swings, the guide by the guide hole may be omitted for the stopper pin 35, and it may be inserted into the positioning hole 23 (see FIGS. 10 to 12 described later, etc.). In this case, although the guidance of the stopper pin 35 to the positioning hole 23 may be somewhat loose, since the base auxiliary plate 20 can be omitted, the number of parts can be reduced and the structure can be simplified accordingly.

[0076] In the present invention, it is not always necessary to attach the vibration detection means such as the seismic sensor 5 shown in the above-described embodiment and the first modification example. For example, the vibration detection means can be used in combination with the holding means such as the two magnets 7a and 7b.

[0077] That is, in the above-described embodiments and the like, the structure obtained by removing the seismic sensor 5 and the passive member 75 associated therewith can be used as the earthquake-resistant structure of the mobile rack of the present invention. In this configuration, the brake plate 3 is held in the vertical posture (normal state) by the magnetic adsorption of the magnets 7a and 7b. However, when vibration occurs due to an earthquake, the brake plate 3 swings due to the vibration, and the adsorption between the two magnets 7a and 7b is released, and the brake plate 3 tilts and the braking gear 1 engages with the sprocket 93, and the braking force of the rotary damper 4 acts on the wheel 91. Therefore, by appropriately correcting the adsorption force between the two magnets 7a and 7b, the two magnets 7a and 7b can be used also as the vibration detection means.

[0078] Also, in the present invention, when the holding means such as the magnets 7a and 7b is also used as the vibration detection means, the following configuration can be adopted in order to improve the vibration detection performance.

[0079] For example, as shown in FIG. 10, a rod pin 50a urged to advance in the left direction (the tilting direction of the brake plate 3) of the figure by a biasing force such as a spring is attached to the side opposite to the operating direction (left direction in the figure) of the brake plate 3 in the normal state. Then, when the brake plate 3 swings due to vibration, the brake plate 3 may be assisted in the operating direction (tilting direction) by the rod pin 50a accompanying the repulsive force of the spring.

[0080] Also, as shown in FIG. 11, by adopting a brake plate 3 with a weight 50b extended and formed at the upper part, the vibration detection performance may be improved.

[0081] Also, as shown in FIG. 12, by attaching an elastic rod 50c having an elastic force to the upper end of the brake plate 3, the vibration detection performance may be improved.

[0082] Furthermore, as shown in FIGS. 13 and 14, a guide member 50d for reliably swinging the elastic rod 50c (brake plate 3) in the tilting direction may be provided. That is, the guide member 50d is arranged such that the guide surface 50e in a "く" shape or "V" shape in plan view faces the outer peripheral surface of the elastic rod 50c, and the elastic rod 50c is also guided along the guide surface 50e with respect to the vibration in the front-rear direction (arrow direction in FIG. 14), so that the elastic rod 50c (brake plate 3) can be reliably swung in the tilting direction.

[0083] In addition, as shown in FIGS. 10 to 14, when the vibration detection means is also used as the holding means (magnets 7a, 7b), the detection performance for the vibration in the front-rear direction (width direction) may be slightly reduced. Therefore, in the present invention, it is preferable to separately adopt the seismoscope 5 shown in the above-described embodiment, the first modification example, etc. that can sufficiently detect the vibration in the width direction.

[0084] Also, in the above embodiment, magnets 7a and 7b are used as holding means for holding the brake plate 3 in the non-operating state. However, the present invention is not limited to this, and other holding means may be used in the present invention. For example, it is also possible to use an index plunger as the holding means. That is, the pin of the index plunger is engaged with the brake plate 3 to hold the brake plate 3 in the non-operating state, and when vibration is detected, the brake plate 3 may be made movable by releasing the engagement.

[0085] Also, in the above embodiment, the case where the earthquake-resistant structure of the present invention is applied to a handle-operated moving rack has been described as an example. However, the present invention is not limited to this, and the earthquake-resistant structure of the present invention can also be applied to a traction-type moving rack.

Industrial Applicability

[0086] The earthquake-resistant structure of the moving rack of the present invention can be suitably used for the moving racks of moving rack facilities installed in factories, warehouses, etc.

Explanation of Reference Numerals

[0087] 1: Brake gear 2: Base plate (supporting member) 20: Base auxiliary plate (supporting member) 23: Positioning hole 3: Brake plate (movable member, swinging member) 35: Stopper pin 4: Rotary damper 5: Seismic sensor (vibration detection means) 6: Display board 60: Display window 61: Operating display area 7a: One-side magnet (holding means) 7b: The other-side magnet (holding means) 91: Wheels 93: Sprocket (interlocking gear) S: Braking mechanism (earthquake-resistant structure)

Claims

1. An earthquake-resistant structure for a mobile rack that can travel via wheels, comprising: An interlocking gear that rotates in conjunction with the rotation of the wheels; A movable member that can move between an operating state and a non-operating state; A rotary damper that is fixed to the movable member and applies a braking force; A braking gear that is fixed to the rotary damper and is separated from the interlocking gear when the movable member is in the non-operating state and meshes with the interlocking gear when the movable member is in the operating state; Retention means for retaining the movable member in the non-operating state; Vibration detection means for detecting vibration, and configured such that based on the detection of vibration by the vibration detection means, the retention by the retention means is released, and the movable member moves from the non-operating state to the operating state and the braking gear meshes with the interlocking gear, whereby the braking force of the rotary damper is applied to the wheels. An earthquake-resistant structure for a mobile rack, characterized in that it is configured as such.

2. The movable member is constituted by a swing member pivotally supported on the lower end side, The retention means is configured to retain the swing member in a state where its self-rotation is restricted, The earthquake-resistant structure for a mobile rack according to claim 1, wherein when the retention by the retention means is released, the swing member rotates by its own weight and the braking gear meshes with the interlocking gear.

3. The movable member is provided with a stopper pin that can protrude, The support member that supports the movable member movably is provided with a positioning hole corresponding to the stopper pin, The earthquake-resistant structure for a mobile rack according to claim 1 or 2, wherein when the movable member is in the operating state, the stopper pin protrudes and is inserted into the positioning hole, whereby the meshing state is maintained.

4. A cover panel is provided to cover the movable member, and a display window is provided on the cover panel, The movable member is provided with a display plate that moves following the movable member, The display plate is provided with an operating display area that can be recognized visually, When the movable member is in the operating state, the operating display area is arranged at a position corresponding to the display window, and the operating display area is configured to be recognizable through the display window. On the other hand,When the movable member is in the non-operating state, the operating display area is arranged at a position deviating from the display window, and the operating display area is configured to be unrecognizable through the display window. The earthquake-resistant structure for a mobile rack according to any one of claims 1 to 3. ​ ​

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