JP2019041920A - Seismic isolator, lock device and caster including the seismic isolator - Google Patents

Abstract

To prevent falling and slip of furniture in earthquake time.SOLUTION: Furniture 3 comprises a grounding device 6 for vertically movably supporting an operation member 11 having a seismic member 13 on a lower end thereof, by a support member 10. A swing member 14 of an operation mechanism 7 is pivotally supported to the support member 10, for vertically moving the operation member 11 energized upward by a first spring 25. A shaft member 40 is coupled to the swing member 14 on a same shaft core, the other end 40A of the shaft member 40 is pivotally supported to the attachment member 42. An operation pedal 41 is coupled to the other end 40A of the shaft member 40 through an engagement member 44. The operation pedal 41 switches a position of the seismic member 13 between an upper non-grounding position and a lower grounding position according to the operation. A holding mechanism 8 is provided on the engagement member 44 and the attachment member 42, for holding the operation pedal 41 between the non-grounding position and the grounding position.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a seismic isolation device provided on an attached body having legs and casters such as furniture and a floor-top base, a locking device thereof, and a caster provided with the seismic isolation device.

  Generally, casters are provided at the four corners of the bottom of a floor head stand arranged near furniture or a hospital bed. Such casters are equipped with a locking device that selectively operates the wheels of the casters in a locked state and an unlocked state in order to prevent the furniture and floor heads from moving freely due to shaking during an earthquake. After installation, the wheels are locked by a locking device so that furniture and floor heads do not move even when shaken.

  In such a conventional caster locking device, the operation communication pin supported by the caster body so as to be movable up and down is urged upward by a spring, and the operation communication pin is moved up and down by an operating lever, and the ascending position and the descending position are set. The locking member is fixed to the operation communication pin and moved up and down integrally, and at the lowered position of the operation communication pin, the first engagement portion of the lock member is engaged with the engagement body of the shaft, The turning is stopped, and the second engagement portion of the lock member is engaged with the engagement surface of the wheel to stop the rotation of the wheel. As described above, conventionally, casters provided on furniture and floor tops are designed to cope with shaking during an earthquake by stopping and turning wheels. In addition, recesses with different circumferential positions are formed in the engagement plate attached to one end of the operation tool, and the engagement pins are displaceably inserted into a pair of long holes formed in the support tool. And a locking device for holding the operation tool is provided (see, for example, Patent Document 1).

JP 2011-98657 A

  However, in the caster locking device disclosed in Patent Document 1, when the wheel is locked, the rotation and rotation of the wheel are locked with respect to the caster. When a large external force is applied to the mounted body, there is a problem that the mounted body slides on the floor or falls while the wheel is locked. In addition, although the operation tool is locked, there is a problem that the lock is released when an impact is applied.

  The present invention has been made to solve the above problems, and provides a seismic isolation device having a simple configuration, high safety, and easy operation, and a locking device that is easy to operate and can be reliably locked. An object is to provide a caster equipped with a seismic device.

  A seismic isolation device according to claim 1 of the present invention is connected to a grounding device having a grounding portion provided on a mounted body and having elasticity that can move up and down, and to the grounding portion of the grounding device so that an external force can be transmitted. An operation mechanism for displacing the operating member to bring the grounding part into contact with and separating from the floor; and a holding mechanism for holding the grounding part at an upper non-grounding position and a lower grounding position according to the displacement of the operating member. It is characterized by comprising.

  In the seismic isolation device according to claim 1 of the present invention, the grounding device provided with the grounding portion provided on the attached body and having elasticity capable of moving up and down is connected to the grounding portion of the grounding device so that an external force can be transmitted. An operation mechanism for displacing the operating member to bring the grounding part into contact with and separating from the floor; and a holding mechanism for holding the grounding part at an upper non-grounding position and a lower grounding position according to the displacement of the operating member. When the operating member is displaced and held, the grounding portion can be brought into contact with the floor to increase the grounding surface, and the seismic isolation performance is improved.

  In the seismic isolation device according to the present invention, the grounding device includes a supporting member attached to the bottom surface of the body to be attached, and is fitted to the supporting member so as to be prevented from falling off and vertically movable, and at the lower end, the grounding unit And an oscillating mechanism that is pivotally supported by the support member and has an oscillating member that moves the operating member up and down. The operating mechanism has the same axis as the oscillating member. A shaft member connected on the core may be provided, and the operation member may be connected to the shaft member via a holding mechanism to rotate the shaft member. The swing mechanism may be configured such that a swing end of the swing member is engaged with the operation member. Further, the swing mechanism is configured such that the swing end of the swing member is placed on the upper end of the operation member, and the operation member is constantly biased upward between the operation member and the support member. The first urging member may be provided to be configured. Further, a second urging member for urging the grounding portion downward may be provided between the operating member and the grounding portion.

  Furthermore, in the seismic isolation device according to the present invention, the holding mechanism is attached to the bottom surface of the body to be attached and supports the one end of the shaft member, and one end of the shaft member accommodated in the attachment member. An engagement member having a recessed portion formed by fitting one end portion to the operation member and having the other end outer edge portion formed at a different circumferential position with respect to the shaft member is formed on the attachment member. It is preferable that the slit is configured to include a lock pin that is inserted through the slit toward the outer edge of the other end so as to be movable forward and backward, and a spring that biases the lock pin toward the outer edge of the other end. The holding mechanism is configured to lock the operation member in a predetermined position when the operation member is pressed in one direction and hold the grounding device in a grounded state, and to lock the operation member when pressed. May be configured to be constituted by a lock mechanism including a lock release operation member that returns the original position to the original position and brings the grounding device into a non-grounding state. Further, the engaging member is formed such that the upper recessed portion is curved so that the opening is widened, and the lower recessed portion is formed to be inclined with substantially the same width as the lock pin, and can substantially accommodate the entire circumference of the lock pin. In addition, a convex portion having a tip formed in an arc shape is formed between the upper concave portion and the lower concave portion, and the operation member is moved downward from the non-grounding position. The lock pin is retracted against the urging force of the spring, and when the operating member reaches the grounding position with a predetermined inclination angle and the slot and the slot match, the lock pin is inserted into the slot. The operation member may be configured to be guided and locked. In addition, the unlocking operation member includes a rotating part that is fitted to one end of the shaft member so as to be relatively rotatable, and an unlocking operation part that extends outward from the rotating part and projects outward from the mounted body. And a bent portion that extends inward from the rotating portion and abuts against the lock pin. When the lock release operation portion is pressed in one direction, the lock pin is resisted against the biasing force of the spring. It may be made to retract and be disengaged from the lower long hole of the engaging member.

  Further, the seismic isolation device according to the present invention is provided with a pair of grounding devices at the outer edge corners of the mounted body, and the operation members are connected to the engaging members of the holding mechanisms respectively corresponding to these grounding devices. You may make it comprise with an operation member. Further, another grounding device is provided at the corner of the outer edge of the attached body on the side facing the pair of grounding devices so as to face each other at an equal distance from the pair of grounding devices. The shaft member may be protruded from the mounting member, and a transmission mechanism that connects the shaft member of a pair of grounding devices and the shaft member of another grounding device so as to be able to transmit an external force may be provided for each different row. Furthermore, the attached body may be provided with legs or casters that secure a gap between the bottom surface of the attached body and the floor. The operating member may be provided on the same axis as the pivot axis of the caster.

  The lock device according to claim 14 of the present invention is pivotally supported by a shaft, and is connected to the shaft member, one end of which is connected to the operating device and switches the operating device between the operating state and the non-operating state, An operating member that rotates the shaft member to operate the operating device, and a lock mechanism that locks the operating member at a predetermined position to hold the operating device in an operating state when the operating member is swung in one direction. The lock mechanism includes a lock release operation member that, when pressed, releases the lock of the operation member and returns the operation member to its original position, thereby bringing the operating device into a non-operating state. .

  In the locking device according to the fourteenth aspect of the present invention, a shaft member that is pivotally supported and has one end connected to the operating device to switch the operating device between the operating state and the non-operating state, and coupled to the shaft member, An operating member that rotates the shaft member to operate the operating device, and a lock mechanism that locks the operating member at a predetermined position to hold the operating device in an operating state when the operating member is swung in one direction. The lock mechanism is provided with a lock release operation member that, when pressed, unlocks the operation member and returns it to its original position to bring the operating device into a non-operating state. Since the unlocking operation member must be operated, the operation member can be firmly locked. For this reason, even if it receives an impact from the outside, the lock is difficult to be released.

  In the lock device according to the present invention, the lock mechanism is fitted to the attachment member attached to the bottom surface of the attachment body and supporting the other end of the shaft member, and the other end of the shaft member accommodated in the attachment member. An engaging member having a recessed portion formed at one end swinging edge portion connected to the operation member and having the other end swinging edge portion having a different circumferential position with respect to the shaft member; A lock pin inserted into the slit formed at the other end swinging edge portion so as to be able to advance and retreat, and a spring for urging the lock pin toward the other end swinging edge portion side. The engaging member is formed such that the upper concave portion is curved so that the opening is widened, and the lower concave portion is formed to be inclined with substantially the same width as the lock pin, and can substantially accommodate the entire circumference of the lock pin. It is formed in a long hole, and the tip is between these upper and lower recesses. When the operation member is pushed downward from the non-operating position and tilted, the lock pin is retracted against the urging force of the spring, and the operation member is When the operating position of the tilt angle is reached and the slot and the long hole are matched, the lock pin may be guided into the long hole to lock the operating member. Moreover, you may make it have the unlocking operation member of Claim 9.

  A caster provided with a seismic isolation device according to claim 17 of the present invention is pivotally supported by a caster body having a pivot shaft, which is pivotally attached to a body to be attached via a support member, and is pivotally supported by the caster body. And a grounding device having a grounding portion having elasticity that can move up and down on the same axis as the turning shaft, and an external force can be transmitted to the grounding portion of the grounding device to displace the operation member. The seismic isolation device has an operating mechanism for bringing the grounding part into contact with and separating from the floor, and a holding mechanism for holding the grounding part at an upper non-grounding position and a lower grounding position according to the displacement of the operation member. It is characterized by comprising.

  In the caster provided with the seismic isolation device according to the seventeenth aspect of the present invention, a caster main body having a pivot shaft that is pivotally attached to a mounted body via a support member, and is pivotally supported by the caster main body. And a grounding device having a grounding portion having elasticity that can move up and down on the same axis as the turning shaft, and an external force can be transmitted to the grounding portion of the grounding device to displace the operation member. The seismic isolation device has an operating mechanism for bringing the grounding part into contact with and separating from the floor, and a holding mechanism for holding the grounding part at an upper non-grounding position and a lower grounding position according to the displacement of the operation member. Since the seismic isolation device is provided integrally with the caster, there is no need to provide a turning lock mechanism or a wheel lock mechanism. For this reason, a caster can be simplified.

  In the caster provided with the seismic isolation device according to the present invention, the grounding device has an upper end protruding from the support member so as not to fall off, and is slidably fitted to the turning shaft, and has a grounding portion at the lower end. And an oscillating mechanism that is pivotally supported by the support member and has an oscillating member that moves the operating member up and down. The operating mechanism has the same axis as the oscillating member. A shaft member connected above may be provided, and the operation member may be connected to the shaft member via a holding mechanism to rotate the shaft member. Furthermore, you may make it have the rocking | fluctuation mechanism of Claim 3 or 4. Moreover, you may make it have the 2nd biasing member of Claim 5. It is preferable that the holding mechanism is the holding mechanism according to any one of claims 6 to 9.

  The seismic isolation device according to the present invention includes a grounding device that is provided on the mounted body and includes a grounding portion having elasticity that can move up and down, and is connected to the grounding portion of the grounding device so that an external force can be transmitted. An operating mechanism that displaces the grounding part to and away from the floor, and a holding mechanism that holds the grounding part at the upper non-grounding position and the lower grounding position according to the displacement of the operation member, respectively. Therefore, when the operation member is displaced and held, the ground contact portion can be brought into contact with the floor to increase the ground contact surface, and seismic isolation performance is improved.

  In addition, the lock device according to the present invention is pivotally supported so that one end is connected to the operating device and the operating device is switched between the operating state and the non-operating state, and the shaft member is connected to the shaft member. And an operating member for operating the operating device by rotating the operating member, and a locking mechanism for holding the operating device in an operating state by locking the operating member at a predetermined position when the operating member is swung in one direction. The lock mechanism includes a lock release operation member that, when pressed, unlocks the operation member and returns it to its original position, thereby bringing the operating device into a non-operating state. It is difficult to return to the non-operating position and safety is improved.

  Further, a caster provided with the seismic isolation device according to the present invention includes a caster body having a pivot shaft that is pivotably attached to an attached body via a support member, and a wheel that is pivotally supported by the caster body. And a grounding device provided with a grounding portion having elasticity that can move up and down on the same axis as the pivot axis, and connected to the grounding portion of the grounding device so that an external force can be transmitted, and the operation member is displaced to displace the An seismic isolation device having an operation mechanism for bringing the grounding part into contact with and separating from the floor and a holding mechanism for holding the grounding part at an upper non-grounding position and a lower grounding position according to the displacement of the operation member. As a result, the ground contact surface can be increased compared to the wheels, so that the seismic isolation performance is improved. Further, since the seismic isolation device is integrally provided in the caster, it is not necessary to provide a turning lock mechanism or a wheel lock mechanism, and the number of parts can be reduced. For this reason, the structure of the caster can be simplified and the cost can be reduced.

FIG. 1 is a side view showing a workpiece to be provided with a seismic isolation device according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the mounted body and the seismic isolation device of FIG. FIG. 3 is a bottom view showing the seismic isolation device provided on the attached body. 4A to 4D are explanatory views showing the grounding device and the operation mechanism of the seismic isolation device, respectively, and FIGS. 4A and 4B are a front view and a perspective view, respectively, when not grounded. C) and (D) respectively show a front view and a perspective view at the time of grounding. 5A and 5B are explanatory diagrams showing the operation of the grounding device and the swinging member, respectively. FIGS. 5C and 5D are the operating member and the ground when not operating and when operating, respectively. It is explanatory drawing which shows the state of a part. 6 (A) and 6 (B) are respectively a partially omitted explanatory view and an explanatory view of a transmission mechanism of a main part showing a seismic isolation device provided on an attached body. FIG. 7 is a partially omitted explanatory diagram of the main part when the state in which the holding mechanism is attached to the attached body is viewed from above. It is explanatory drawing which shows operation | movement of a holding mechanism. FIGS. 8A and 8B are an explanatory view showing the operation of the holding mechanism and an explanatory view showing an enlarged main part of the engaging member of the holding mechanism, respectively. 9 (A) to 9 (D) are explanatory views showing a grounding device and an operation mechanism of the seismic isolation device according to the second embodiment of the present invention, respectively (A) and (B) being ungrounded. (C) and (D) show a front view and a perspective view, respectively, at the time of grounding. FIGS. 10A and 10B are a perspective view and a side view, respectively, showing a modification of the support member according to the first and second embodiments of the present invention. 11A and 11B are explanatory diagrams of the seismic isolation device according to the third embodiment of the present invention when not grounded and when grounded, respectively. FIG. 12 is a perspective view of a main part of the seismic isolation device of FIG. 11. FIG. 13 is an explanatory view showing a seismic isolation device according to the fourth embodiment of the present invention. FIG. 14 is a perspective view showing a main part of the seismic isolation device of FIG. 13. FIG. 15 is a side view showing a part of the operation mechanism of the seismic isolation device of FIG. 13. FIG. 16 is a perspective view showing an operation mechanism of the seismic isolation device of FIG. FIG. 17 is a perspective view showing a main part of the operation mechanism of the seismic isolation device of FIG. 13. 18A and 18B are explanatory views showing the operation of the lock mechanism of the seismic isolation device of FIG. FIG. 19 is a perspective view showing a main part of the operation mechanism of the seismic isolation device of FIG. 13. 20A and 20B are a perspective view and a plan view, respectively, showing a modification of the seismic isolation device according to the fourth embodiment of the present invention. FIGS. 21A and 21B are a plan view and a partially broken side view, respectively, showing a caster provided with a seismic isolation device according to the fifth embodiment of the present invention. 22A and 22B are a front view and a perspective view, respectively, of the caster provided with the seismic isolation device of FIG. 21 when not grounded, and FIGS. 22A and 22B are respectively grounded. It is a front view and a perspective view.

  Hereinafter, the seismic isolation apparatus 2 which concerns on the 1st Embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG. As shown in FIGS. 1 to 3, the seismic isolation device 2 according to the first embodiment of the present invention is provided in a furniture (attached body) 3 having a flat rectangular bottom used in a hospital or facility. It is done. At the four corners of the bottom surface 4 of the furniture 3, legs 5 having the same height dimension T1 are provided. The seismic isolation device 2 includes a grounding device (operation device) 6, an operation mechanism 7, and a holding mechanism 8. Hereinafter, the same reference numerals indicate the same or corresponding parts.

  As shown in FIGS. 4A to 4D and FIGS. 5A and 5B, the grounding device 6 includes support members 10 (10FR, 10FL, 10RR, 10RL), an operation member 11 fitted to the support member 10 so as to be movable up and down, a seismic isolation member (grounding portion) 13 provided at the lower end of the operation member 11, and swinging to the support member 10 A swing mechanism 15 having a swinging member 14 that is pivotally supported and moves the operating member 11 up and down in accordance with the operation of the swing end 14A.

  The support member 10 is formed by bending a metal fitting into a U-shaped cross section, and a flange portion 21 in which a screw hole for attachment is formed at an upper end opening edge is provided below the bottom portion 23 between both side walls 22A and 22B. Are each provided with a cylindrical portion 24. A circular rod-shaped operating member 11 is fitted in a circular hole formed in the bottom 23 of the support member 10 so as to be movable up and down. The operating member 11 is provided with a stopper 12 at the top, and a first spring (first urging member) 25 is disposed between the stopper 12 and the bottom 23, and the operating member 11 is always kept upward. It is supposed to be energized. Further, the operating member 11 is provided with a spring receiver 26 at an intermediate portion, and is displaced within the cylindrical portion 24 in accordance with the vertical movement of the operating member 11.

  The seismic isolation member 13 is made of a friction material having elasticity made of circular rubber or synthetic resin. On the upper surface of the seismic isolation member 13, a recessed portion 13A is formed as shown in FIGS. The seismic isolation member 13 is connected to the cylindrical body 28 provided in the recessed portion 13 </ b> A so as to accommodate the lower end large diameter portion 11 </ b> B of the operation member 11 so as to prevent falling off and move up and down. A second spring (second biasing member) 27 is disposed between the recessed portion 13A and the spring receiver 26 so as to constantly bias the seismic isolation member 11 downward. That is, when the operating member 11 does not receive an external force, the operating member 11 is displaced upward by the biasing force of the first spring 25 (see FIGS. 4A and 4B and FIG. 5A). When the rocking member 14 is pressed and displaced to the lower grounding position against the urging force of the first spring 25, the seismic isolation member 13 is pressed against the floor F by the urging force of the second spring 27. (See (C) and (D) of FIG. 4 and (B) and (D) of FIG. 5). As described above, the grounding device 6 includes the second spring 27 that presses the seismic isolation member 13 against the floor F during grounding (operation).

  The swing member 14 has a base portion fitted into a sleeve 32 pivotally supported in a circular hole formed in both side walls 22 A and 22 B of the support member 10, and the swing end 14 A is the upper end of the operation member 11. 11A. The swing member 14 is configured such that the swing end 14 </ b> A swings with the rotation of the sleeve 32. When a force that overcomes the biasing force of the first spring 25 is applied from the sleeve 32 side, the swing member 14 operates. When the member 11 is pushed down and the external force is lost, the member 11 returns to the original upper position by the biasing force of the first spring 25. Thus, the swing mechanism 15 includes the swing member 14, the first spring 25, and the sleeve 32.

  As shown in FIGS. 6 and 7, the operating mechanism 7 has a shaft whose one end is connected to the same axis as the sleeve 32 and whose other ends 40 </ b> A and 40 </ b> A are pivotally supported in the circular holes 42 </ b> D and 42 </ b> D of the mounting members 42 and 42. The members 40 and 40 and an operation pedal (operation member) 41 that is connected to the other ends 40A and 40A of the shaft members 40 and 40 via a holding mechanism 8 described later and rotates the shaft members 40 and 40 are provided. Composed. The attachment members 42, 42 are attached to the bottom surface 4 of the furniture 3, and are attached in pairs between the support members 10 FL, 10 FR provided as a pair on the front side 3 </ b> A of the outer edge of the furniture 3.

  As shown in FIG. 7 and FIG. 8A, the mounting member 42 includes both side walls 42A and 42B and an intermediate wall 42C connecting the both side walls 42A and 42B, and the upper end opening edges of the side walls 42A and 42B. Each has a flange portion 43 in which a mounting screw hole is formed. The attachment member 42 is open on the lower side and the outer edge side of the furniture 3. An engaging member 44 having a U-shaped cross section is fitted to the other end 40 </ b> A of the shaft member 40 so as to be movable integrally within the mounting member 42. The engaging member 44 is configured to include both side wall portions 44 </ b> A and 44 </ b> B and an intermediate wall portion 44 </ b> C that connects both the wall side portions 44 </ b> A and 44 </ b> B and faces the outer edge side of the furniture 3. That is, the intermediate wall portion 44 </ b> C is disposed so as to face the intermediate wall 42 </ b> C of the attachment member 42. Both end bent portions 41 </ b> A and 41 </ b> B of the operation pedal 41 are connected to the intermediate wall portion 44 </ b> C of the engaging member 44. The operation pedal 41 is formed by bending a pipe material into a U-shape. When the operating pedal 41 is swung, the shaft member 40 is rotated forward and backward via the engaging member 44, and the swinging member 14 is swung along with this rotation.

  Of the swinging ends of the side wall portions 44A and 44B of the engaging member 44, on the side opposite to the intermediate wall portion 44C (the other end swinging edge portion), as shown in FIGS. The upper concave portion 45 and the lower concave portion 46 are each formed in a curved shape in which the opening is widened by making the circumferential position different from the axial center O1 of the shaft member 40. Between the two concave portions 45 and 46, a convex portion 49 whose tip is formed in an arcuate curve is formed, and the both concave portions 45 and 46 are defined. The convex part 49 recedes from a line connecting the upper edge protruding part of the upper recessed part 45 and the lower edge protruding part of the lower recessed part 46, and is formed in a short size. In addition, slits 42Aa and 42Ba are formed in the horizontal direction in both side walls 42A and 42B of the mounting member 42 at substantially the same height as the axis O1 of the shaft member 40. A lock pin 47 is inserted into the slits 42Aa and 42Ba, and both ends are moved forward and backward to prevent dropping. A spring 48 is provided between the lock pin 47 and the intermediate wall 42C, and the lock pin 47 is always urged toward the recessed portions 45 and 46 of the engagement member 44. Each of the upper concave portion 45 and the lower concave portion 46 is shallow so that almost half of the entire circumference of the lock pin 47 contacts when the lock pin 47 is received. The curved surface 46 </ b> A of the lower recessed portion 46 matches the peripheral surface of the lock pin 47. When the lock pin 47 is pressed against the lower recessed portion 46, the engagement member 44 is held in that state. Is done. That is, the operation pedal 41 is held at that position. When the operating pedal 41 is pushed in the upward returning direction from that state, the biasing force by the second spring 27 of the grounding device 6 is received through the shaft member 40, so that the operating pedal 41 is pressed with a slight force in the returning direction. Just turn it and it will automatically rotate in the return direction. At this time, the lock pin 47 is pushed out to the lower edge portion of the lower recessed portion 46, and against the biasing force of the spring 48 in the slits 42 </ b> Aa and 42 </ b> Ba along the arcuate tip portion 49 </ b> A of the convex portion 49. It is retracted and separated from the lower concave portion 46 and guided to the upper concave portion 45.

  For this reason, when the operation pedal 41 is in a substantially horizontal position, the lock pin 47 is elastically urged and pressed against the upper recessed portion 45 by the spring 48 to hold the operation pedal 41 in that position. Yes. At this time, the shaft member 40 is in a state of being turned to the clockwise limit end with respect to the axis O1 shown in FIG. 8A, and the swing end 14A of the swing member 14 is at the uppermost position. It is supposed to be located. When the operation pedal 41 is pushed down by an external force, the lock pin 47 moves backward against the biasing force of the spring 48, is guided to the lower recessed portion 46, and is pressed by the spring 48. For this reason, the engaging member 44 and the operation pedal 41 are held in an inclined state. At this time, the shaft member 40 is in a state of being rotated to the restriction end in the counterclockwise direction with respect to the axis O1 shown in FIG. 8A, and the swing end 14A of the swing member 14 is downward. The seismic isolation member 13 is pressed against the floor F by the second spring 27 by being pushed down to push the operation member 11 downward. As described above, the holding mechanism 8 includes the attachment member 42, the engagement member 44, the lock pin 47, and the spring 48.

  The grounding device 6 is provided at the four corners of the bottom surface 4 of the furniture 3. That is, as shown in FIGS. 2 and 3, the pair of front grounding devices 6A and 6B are connected to the operation mechanism 7, and another pair of grounding devices 6A and 6B is connected to the side facing the pair of grounding devices 6A and 6B. Grounding devices 6C and 6D are provided. The other pair of grounding devices 6C and 6D are provided facing each other at an equal distance from the pair of grounding devices 6A and 6B. The grounding devices 6A and 6C constitute the first row grounding device (the right row grounding device), and the grounding devices 6B and 6D constitute the second row grounding device (the left row grounding device). . The grounding devices 6A and 6C in the first row on the right side and the grounding devices 6B and 6D in the second row on the left side are rearward from the pair of grounding devices 6A and 6B on the front side by the transmission mechanism 9, respectively. External force is transmitted to another pair of grounding devices 6C and 6D on the side.

  That is, as shown in FIGS. 6A and 6B, shaft members each having one end connected to the same axis as the sleeves 32 and 32 are connected to another pair of grounding devices 6C and 6D on the rear side. 50, 50 are provided. The shaft members 50 and 50 are extended to the side where the other ends 50A and 50A face each other. Long shaft-like links 51 and 52 are provided on the shaft members 40 and 40 and the extended ends 50A and 50A of the shaft members 50 and 50, respectively. One end of one link 51 is fitted to the shaft member 40, and one end of the other link 52 is fitted to the extended end 50A so as to be rotatable. The other ends of these links 51 and 52 are pivotally supported at both ends of the connecting rod 53. For this reason, when the operation pedal 41 is swung, the rotation of the shaft members 40, 40 is transmitted to the grounding devices 6C, 6D on the rear side via the connecting rods 53, 53 in each row, and the seismic isolation member 13 , 13 are moved up and down. As described above, the transmission mechanism 9 includes the links 51 and 52 and the connecting rod 53.

  Next, the operation of the seismic isolation device 2 will be described based on the operation of the seismic isolation device 2 according to the first embodiment. In the seismic isolation device 2 according to the present embodiment, when the furniture 3 is installed at a desired location, first, the operation pedal 41 is pulled up to the upper horizontal position. Then, since the shaft member 40 is rotated to the restriction end position in the clockwise direction with respect to the axis O1 shown in FIG. 8A, the swing member 14 is swung as shown in FIG. The moving end 14A is located at the uppermost position, the operating member 11 is biased upward by the biasing force of the first spring 25, and the upper end surface 11A is in contact with the lower surface of the swinging end 14A. At this time, the spring receiver 26 of the operation member 11 is positioned near the upper surface in the cylindrical portion 24, and the seismic isolation member 13 is brought into contact with the lower end surface of the cylindrical portion 24 by the second spring 27 (FIG. 5). (See (A) and (C)). In this state, the seismic isolation member 13 is located above the lower end surface of the leg 5, and the grounding device 6 is in a non-operating state.

  Next, when the seismic isolation device 2 is operated, when the operation pedal 41 is pushed down from the horizontal position, the engaging member 44 moves integrally, and the shaft member 40 is moved to the shaft shown in FIG. Rotate counterclockwise with respect to the center O1. As the shaft member 40 rotates, the swing member 14 swings, the swing end 14A presses the upper end surface 11A of the operating member 11, and an external force against the biasing force of the first spring 25 is applied. Then, the operation member 11 is displaced downward. At this time, the external force from the operation pedal 41 is transmitted not only to the grounding devices 6A and 6B on the front side but also to the grounding devices 6C and 6D on the rear side through the connecting rod 53 of the transmission mechanism 9, and the operation member 11 is displaced downward. To do. For this reason, in the grounding devices 6 </ b> A to 6 </ b> D arranged at the four corners of the furniture 4, the operation members 11 are displaced downward by the operation of the operation pedal 41. When the operation pedal 41 reaches a predetermined position below, the operation pedal 41 is held at that position by the lock pin 47. At this time, since the seismic isolation member 13 is urged by the second spring 27, the lower surface 13 </ b> B is pressed against the floor F when it is displaced downward from the legs 5. At this time, since the lock pin 47 of the holding mechanism 8 is pressed against the lower recessed portion 46 of the engagement member 44 by the spring 48, the operation pedal 41 is inclined downward even when the foot is released from the operation pedal 41. Retained. In this way, the seismic isolation member 13 is brought into pressure contact with the floor F only by one-touch operation of the operation pedal 41. For this reason, even if a swinging force is applied to the furniture 3 due to an earthquake or the like, the furniture 3 does not slip or fall, and safety is improved. When releasing the grounding operation of the seismic isolation device 2, if the operating pedal 41 is pulled upward, the operating pedal 41 automatically moves to the original non-grounding position in combination with the urging force of the second spring 27. The grounding device 6 can be returned to the non-operating state. In this way, in the seismic isolation device 2 according to the present embodiment, the seismic isolation member 13 is pressed against the floor F, so even if the furniture 3 is shaken by an earthquake or the like, it is difficult to fall down and can be prevented from slipping. . For this reason, in the seismic isolation apparatus 2 which concerns on this embodiment, there exists an effect that it is highly safe and it is easy to operate with a simple structure.

  In the first embodiment, the grounding device 6 (6A to 6D) of the seismic isolation device 2 is provided at each of the four corners of the furniture 3, and four pieces are attached. However, the present invention is not limited to this. Depending on the size, two pairs may be provided, or only one may be provided alone.

  Next, the seismic isolation device 102 according to the second embodiment of the present invention will be described. In the seismic isolation device 102 according to the first embodiment, the seismic isolation device 102 according to the first embodiment has the swing end 14 </ b> A of the swing member 14 placed on the upper end surface 11 </ b> A of the operation member 11. On the other hand, as shown in FIGS. 9A to 9D, the swinging end 114A of the swinging member 114 of the grounding device 106 is locked to the upper part of the operating member 111 so as to move integrally. Is different from that of the seismic isolation device 2 according to the first embodiment.

  That is, the swinging end 114A of the swinging member 114 is formed with a through hole 114B in the vertical direction, the rod-shaped operating member 111 is formed with a small-diameter portion 111A at the top, and a large-diameter portion 111B at the bottom. . A through-hole 114B of the swing end 114A is loosely fitted to the small diameter portion 111A, and a stopper 112 is attached to the upper end of the operating member 111 to prevent the swing end 114A from falling off. The swing end 114A can be displaced vertically along the small diameter portion 111A and abuts on the upper end surface 111C of the large diameter portion 111B. When the operation pedal 41 is in the upper horizontal position, the swinging end 114A of the swinging member 114 is positioned upward, and the retaining member 112 is disposed on the swinging end 114A. To position. At this time, the seismic isolation member 13 is held above the lower end of the leg 5.

  When operating the seismic isolation device 102, when the operation pedal 41 is pushed downward from the upper horizontal position, the shaft member 40 is rotated counterclockwise with respect to the axis O1, and the swing end of the swing member 114 is moved. When 114A is displaced downward along the small-diameter portion 111A, contacts the upper end surface 111C of the large-diameter portion 111B, pushes down the operating member 111, and the operation pedal 41 reaches the lower regulating end, the operating member 111 When the lowermost position is reached, the seismic isolation member 13 is pressed against the floor F. The operation pedal 41 is held by the lock pin 47 of the holding mechanism 8 in an inclined state. And when releasing operation | movement of the seismic isolation apparatus 102, if the operation pedal 41 is pulled up, the shaft member 40 will be shown to FIG. 8 (B) in combination with the urging | biasing force of the 2nd spring 27. FIG. The pivot member 114A is rotated clockwise with respect to the axis O1, and the swinging end 114A lifts the stopper 112, so that the operation member 111 is held at the uppermost position. As described above, in the seismic isolation device 102 according to the present embodiment, since the swing end 114A of the swing member 114 is locked to the operation member 111, it is not necessary to provide the first spring 25.

  FIGS. 10A and 10B are a perspective view and a side view, respectively, showing a modification of the support member 10 of the seismic isolation devices 2 and 102 according to the first and second embodiments of the present invention. The support member 210 of the seismic isolation device 202 according to this modification is obtained by bending the support member 10 into a U-shaped cross section in the seismic isolation devices 2 and 102 according to the first and second embodiments. The upper end opening edge is provided with a flange portion 21 in which a screw hole for attachment is formed, and a cylindrical portion 24 is provided below the bottom portion 23 between both side walls 22A and 22B. The support member 210 of the grounding device 206 according to the present invention is formed with a half-cylindrical main body 211 and a rear half extending from the opening of the half-cylindrical main body 211 and facing each other, and a sleeve 32 is rotatably fitted. A pair of support portions 212A and 212B in which circular holes 213 are formed, and a cylindrical portion 224 that is formed at the bottom of the half-cylindrical main body 211 and through which the operation member 11 passes and that houses the second spring 27. Prepared and molded integrally with synthetic resin Configured point is different. The support member 210 is formed with a C-shaped flange portion 216 having an attachment hole 215 at the upper end portion over a part of the half cylindrical main body 211 and the support portions 212A and 212B. In the seismic isolation device 202 provided with the support member 210 according to this modification, the flange portion 216 is formed in an arc shape, so that the bottom surface on the attached body side can be applied not only to a flat surface but also to a pipe having a flange. It can also be applied to those equipped. For this reason, versatility improves.

  Next, a seismic isolation device 302 according to a third embodiment of the present invention will be described. In the seismic isolation device 302 according to the present embodiment, the seismic isolation devices 2, 102, and 202 according to the first and second embodiments and the modified examples are provided with the seismic isolation devices 2 and 102 on the furniture 3 having the legs 5. 11 (A), (B) through FIG. 12 except that the seismic isolation device 302 is provided on the furniture (attached body) 303 having the casters 305. The seismic isolation devices 2, 102, and 202 according to the first and second embodiments and the modified examples have substantially the same configuration.

  That is, the seismic isolation device 302 according to the third embodiment is provided in the furniture 303 having a rectangular flat bottom portion 303A. The caster 305 includes a caster mounting member 310 that is pivotably attached to the four corners of the bottom 303A of the furniture 303, a caster body 311 that is provided on the caster mounting member 310 via a pivot shaft (not shown), and both sides of the caster body 311. And a wheel 312 provided rotatably. (A) of FIG. 11 is an explanatory view showing when the seismic isolation device 302 is not grounded (non-operating), and (B) of FIG. 11 is an explanatory diagram showing when grounding (operating). When the seismic isolation device 302 is not operating, the seismic isolation member 13 is held above the ground contact surface of the wheel 312 of the caster 305. In operation, the seismic isolation member 13 is pushed down by the second spring 27 below the ground contact surface of the wheel 312 of the caster 305 to support the furniture 303. As described above, the seismic isolation device 302 according to the third embodiment can be applied to furniture and a floor-top base including the casters 305. In addition, since it is not necessary to provide a stopper mechanism on the caster 305, the structure of the caster 305 can be simplified and the cost can be reduced.

  Next, a seismic isolation device 402 according to a fourth embodiment of the present invention will be described. In the seismic isolation device 402 according to the present embodiment, in the seismic isolation devices 2, 102, 202, and 302 according to the first to third embodiments and the modifications, the operation pedal 41 is configured by a single metal fitting. On the other hand, as shown in FIGS. 13 and 14, the operation pedals 461 and 462 are separated from each other according to the operation, and the holding mechanism is a lock mechanism (lock device that locks the operation pedal 461 when the operation pedal 461 is operated. ) 408 is different.

  That is, in the seismic isolation device 402 according to the present embodiment, the operation mechanism 407 includes shaft members 440 and 440 coupled on the same axis as the sleeve 32 of the swing member 14 as shown in FIGS. The other end portions 440A and 440A of the shaft members 440 and 440 are connected to the operation pedal (operation member) 461 and the unlock operation pedal (operation member and unlock operation member) 462, respectively. Configured. The other end portions 440 </ b> A and 440 </ b> A of the shaft members 440 and 440 are formed in a regular hexagonal cross section and are pivotally supported by the circular holes of the mounting members 442 and 442. In the attachment members 442 and 442, slits 442Aa and 442Ba are formed in the horizontal direction at substantially the same height as the axis O2 of the shaft member 440. The widths of the slits 442Aa and 442Ba are set slightly longer than the diameter of the lock pin 47.

  An engaging member 444 having a U-shaped cross section is fitted to the other end portion 440A of the shaft member 440 so as to be integrally movable. The engagement member 444 includes a side wall portion 444A, 444B and an intermediate wall portion 444C that connects the both wall side portions 444A, 444B and faces the outer edge side of the furniture 3. As shown in FIG. 17, regular hexagonal holes 442 </ b> D and 442 </ b> D are formed in both side wall portions 444 </ b> A and 444 </ b> B of the engaging member 444, and the other end portion 440 </ b> A of the shaft member 440 is fitted. The operation pedal 461 is configured by molding a plate-shaped metal fitting into a U-shape, and both end bent portions 461A and 461B are joined to the intermediate wall portions 444C and 444C of the engaging members 444 and 444 by welding.

  As shown in FIG. 17 and FIG. The upper concave portion 445 and the lower concave portion 446 are formed with different circumferential positions with respect to the center O2. Between the two concave portions 445 and 446, a convex portion 449 whose tip is formed in an arcuate curve is formed, and the both concave portions 445 and 446 are defined. The convex portion 449 is formed to recede from a line connecting the upper edge protruding end 445A of the upper recessed portion 445 and the lower edge protruding end 446A of the lower recessed portion 446. The upper recessed portion 445 is formed so as to be curved and the opening widened. The lower recessed portion 446 is formed in a long hole shape that is inclined with respect to the lower end surfaces of the both wall side portions 444A and 444B and extends toward the axis O2, and the innermost portion matches the peripheral surface of the lock pin 47. It is formed in a circular arc shape. The width of the elongated hole portion of the lower recessed portion 446 is formed to substantially match the diameter of the lock pin 47, and the depth (depth) of the elongated hole portion is such that the entire circumference of the lock pin 47 is accommodated. ing.

  The unlocking operation pedal 462 is configured by molding a plate-shaped metal fitting into a U shape, and is disposed above the operation pedal 461. The arm portion 462C of the unlocking operation pedal 462 is shorter than the arm portion 461C of the operation pedal 461. As shown in FIG. 17, the unlocking operation pedal 462 is formed by bending so that the extended end of the arm portion 462C is inclined downward, and on the arm portions 462C, 462C side of these bent portions 462A, 462B, Rotating portions 463 and 463 are formed. The rotating portions 463 and 463 are disposed inside the engaging member 444. That is, the rotating portions 463 and 463 are respectively formed with circular holes 463A and 463A that match the cross-sectional shape of the other end portion 440A of the shaft member 440, and are fitted so as to be rotatable independently of the other end portion 440A. Is done. The unlocking operation pedal 462 is configured such that the bent portions 462A and 462B are urged by the spring 48 via the lock pin 47 and are always held in the upper horizontal position.

  As shown in FIG. 15, the unlocking operation pedal 462 is in the grounding position (the grounding position of the grounding devices 6, 106, 206) with the operation pedal 461 inclined downward (see FIG. 18B). When the force to push down from the outside is applied to the unlocking operation pedal 462, the rotating portions 463 and 463 slide on the other end portions 440A and 440A around the axis O2 of the shaft member 440, and the bent portions 462A and 462B Displacement upward (counterclockwise in FIG. 6), the lock pin 47 is retracted against the biasing force of the spring 48, and the lock pin 47 is forcibly separated from the lower recessed portion 446 of the engagement member 444, It leads to the upper recessed part 445.

  In other words, when the operation pedal 461 is in the upper horizontal position (the non-grounding position of the grounding devices 6, 106, 206) as shown in FIG. The open end portion of the member 444 opposite to the intermediate wall portion 444C rotates upward, and the lock pin 47 is retracted along the convex portion 449 from the curved upper concave portion 445, and the top portion 449A of the convex portion 449 is moved. Pass through and reach the entrance of the lower recess 446. When the long hole-like lower concave portions 446 and 446 overlap with the gaps of the slits 442Aa and 442Ba, the lock pin 47 is moved from the opening of the lower concave portions 446 and 446 by the spring 48 to the innermost part of the lower concave portions 446 and 446. Pressed to the part. At this time, the operation pedal 461 is locked with its rotation restricted by the lock pin 47. For this reason, even if an impact is applied from the outside, the lock pin 47 is biased by the spring 48, so that the lock pin 47 is difficult to be removed from the lower recessed portion 446 and is securely locked. . In order to unlock the operation pedal 461, the unlock operation pedal 462 is pushed down from the upper horizontal position by an external force. Then, the bent portions 462A and 462B retract the lock pin 47 against the urging force of the spring 48 and push it out to the convex portion 449 side. When the lock pin 47 passes the top of the convex portion 449, the lock pin 47 is guided to the upper recessed portion 445 by the biasing force of the spring 48, and the operation pedal 461 is automatically coupled with the biasing force of the second spring 27. Accordingly, the operation pedal 461 is returned to the upper horizontal position, that is, to the non-grounding position together with the unlocking operation pedal 462.

  Although the unlocking operation pedal 462 rotates independently of the shaft member 440, since the operating pedal 461 is disposed below the arm portions 462C and 462C, only the unlocking operation pedal 462 is pushed down. If possible, the unlocking operation pedal 462 and the operation pedal 461 can be simultaneously depressed. In either case, the grounding operation is canceled. Therefore, in any case, when the unlocking operation pedal 462 is pushed downward, the operation pedal 461 is also returned to the upper horizontal position, and the lock pin 47 is moved to the upper recessed portion 445 of the engaging member 444. (See FIG. 18A). Further, when the lock release operation pedal 462 is operated, when the lock pin 47 is retracted and guided to the upper recessed portion 445, the engagement member 444 is rotated in the return direction by the urging force of the second spring 27. However, the present invention is not limited to this, and a spring urging in the return direction may be provided between the engagement member 444 and the attachment member 442.

  For this reason, in the seismic isolation device 402 according to the present embodiment, the operation pedal 461 is in the upper horizontal position and the grounding devices 6, 106, 206 are in the non-operating state, so that the operating state (grounding state) is set. When the operation pedal 461 is pushed down with one touch, the lock pin 47 is elastically pressed against the long hole-like lower recessed portion 446 of the engaging member 444, and the engaging member 444 is moved to the lower operating position (grounding position). ). At this time, since the lock pin 47 is urged by the spring 48, the lock pin 47 is unlikely to be detached from the lower recessed portion 446 even when an impact is applied from the outside. On the other hand, when the operation pedal 461 is in the downward inclined position and the grounding devices 6, 106, 206 are in the operating state (grounding state), the unlocking operation pedal 462 is set to the non-operating state (non-grounding state). Is pushed downward by one touch, the lock pin 47 is pushed out from the lower concave portion 446, guided by the convex portion 449, guided to the upper concave portion 445, and pressed by the spring 48. For this reason, the operation pedal 461 is held at the upper horizontal position. That is, the operation state (grounding state) can be switched to the non-operational state (non-grounding state) with one touch, and the operation member (operation pedal 461) can be locked in the operation state. During operation, the operation state can be reliably maintained even when an impact is applied from the outside.

  The lock mechanism 408 is applied to the seismic isolation devices 2, 102, 202, 302, and 402 in the present invention, but is not limited to this, and can be applied to devices equipped with other operation devices. Needless to say, the operation member may be securely locked and used as a lock device that can reliably maintain the operating state even if an impact is applied from the outside.

  20A and 20B relate to a modification of the seismic isolation device 402 according to the fourth embodiment of the present invention. In the seismic isolation device 402 according to the fourth embodiment, an operation pedal is used. 461 is configured by molding a plate-shaped metal fitting into a U-shape, whereas the ground operation pedal 481 is different from that formed by forming a tubular metal fitting into a U-shape. It has substantially the same configuration as the seismic isolation device 402 according to the embodiment.

  Next, a seismic isolation device 502 according to a fifth embodiment of the present invention will be described. The seismic isolation device 502 according to the present embodiment is similar to the grounding device 6 in the vicinity of the leg 5 or the caster 305 in the seismic isolation devices 2, 102, 202, 302, and 402 according to the first to fourth embodiments and the modifications. , 106, and 206, as shown in FIGS. 21A and 21B and FIGS. 22A to 22D, the grounding device 506 of the seismic isolation device 502 is connected to the caster 505. The difference is that it is integrated and integrated.

  That is, in the seismic isolation device 502 according to the present embodiment, the operation member 511 of the grounding device 506 is accommodated inside the turning shaft 530 of the caster 505 so as to be slidable in the vertical direction on the same axis. A caster 505 includes a support member 521 having a U-shaped cross section that is attached to furniture (not shown) that is not illustrated, and a caster body 531 that is rotatably attached to the support member 521 via a hollow cylindrical turning shaft 530. The wheels 533 and 533 are provided on both sides of the caster body 531 so as to be rotatable via an axle 532.

  The upper end of the pivot shaft 530 is threaded and is fastened to the support member 521 by a screw fastener 534. The operation member 511 is slidably provided so as to penetrate the turning shaft 530 and protrude vertically. The operating member 511 has an upper portion 511B protruding upward from the bottom portion 521 of the support member 521, and a spring seat 512 is attached to the upper portion 511B. A first spring 525 is provided between the spring seat 512 and the bottom 521A of the support member 521, and always urges the operation member 511 upward. The operation member 511 protrudes downward from the lower end opening of the pivot shaft 530, and a seismic isolation member (grounding portion) 513 is provided at the lower end. The seismic isolation member 513 is provided with a support guide 540 that guides the vertical movement of the seismic isolation member 513, and when the seismic isolation member 513 is grounded to the floor F, the seismic isolation member is subjected to lateral external force. 513 is supported. This support guide 540 has a block portion 541 whose one surface is joined to the seismic isolation member 513, and long arm portions 543, 543 that rise upward from the left and right sides of the block portion 541 and have vertical slots 542, 542 formed therein. And is configured. Both ends of the axle shaft 532 are fitted into these slots 542 and 542, and the support guide 540 can be displaced relative to the axle shaft 532 in the vertical direction. The operating member 511 is provided with a spring seat 526 at the lower large diameter portion 511 </ b> C, and a second spring 527 is disposed between the spring seat 526 and the seismic isolation member 513. The second spring 527 presses the seismic isolation member 513 against the floor F when the operation member 511 is pushed down. A swing end 14 </ b> A of the swing member 14 constituting the swing mechanism 15 is placed on the upper end surface 511 </ b> A of the operation member 511.

  For this reason, when operating the seismic isolation device 502, when the operation pedal 41 (operation pedals 461 and 481) is pushed down from the upper horizontal position, the shaft member 40 (440) is rotated, and the swing member 14 is swung. When the moving end 14A presses the upper end surface 511A of the operating member 511 and an external force that overcomes the biasing force of the first spring 525 is applied, the operating member 511 is displaced downward. When the operation pedal 41 (operation pedals 461 and 481) is further pushed down and held or locked at the grounding position by the holding mechanism 8 or the lock mechanism 408, the operation member 511 reaches the lower grounding position and the seismic isolation member. 513 is pressed against the floor F by the second spring 527. For this reason, even if a swinging force is applied to the furniture 503 due to an earthquake or the like, the furniture 503 does not slip or fall, and safety is improved. In addition, since the grounding device 506 of the seismic isolation device 502 is integrated with the caster 505, the number of parts can be reduced. Thus, since it is not necessary to provide the caster 505 with a turning lock mechanism or a wheel lock mechanism, the structure of the caster can be simplified and the cost can be reduced.

2 Seismic isolation device 3 Furniture (attachment)
6 Grounding device 7 Operating mechanism 8 Holding mechanism

Claims (21)

  A grounding device provided with a grounding portion that is provided on the mounted body and has elasticity that can move up and down, and is connected to the grounding portion of the grounding device so that an external force can be transmitted, and an operating member is displaced to place the grounding portion on the floor An seismic isolation device, comprising: an operating mechanism that contacts and separates; and a holding mechanism that holds the grounding portion at an upper non-grounding position and a lower grounding position in accordance with displacement of the operation member. The grounding device includes a support member attached to the bottom surface of the body to be attached, an operation member that is prevented from falling off and is vertically movably fitted to the support member, and a grounding portion is provided at a lower end, and the support member And a swinging mechanism having a swinging member that is pivotally supported by the shaft and moves the operation member up and down.
The operation mechanism includes a shaft member connected on the same axis as the swing member, and the operation member is connected to the shaft member via a holding mechanism and rotates the shaft member. The seismic isolation device according to claim 1.   The seismic isolation device according to claim 2, wherein the swing mechanism is configured such that a swing end of the swing member is engaged with the operation member.   The swing mechanism is configured such that a swing end of the swing member is placed on an upper end of the operation member, and the operation member is always urged upward between the operation member and the support member. The seismic isolation device according to claim 2, comprising one urging member.   5. The waiver according to claim 2, wherein a second urging member that urges the grounding portion downward is provided between the operation member and the grounding portion. Seismic device.   The holding mechanism is fitted to an attachment member attached to a bottom surface of the attached body and pivotally supporting one end of the shaft member, and one end of the shaft member accommodated in the attachment member, and one end portion is connected to the operation member. An engagement member having a recessed portion formed at a different circumferential position with respect to the shaft member at the outer edge of the other end, and a slit formed in the mounting member to advance and retract toward the outer edge of the other end. 6. The relief according to claim 2, further comprising: a lock pin that is movably inserted; and a spring that biases the lock pin toward the outer edge of the other end. Seismic device.   The holding mechanism is configured to lock the operation member in a predetermined position when the operation member is pressed in one direction and hold the grounding device in a grounded state, and to release the lock of the operation member when pressed. The seismic isolation device according to claim 1, wherein the seismic isolation device includes a lock mechanism including a lock release operation member that returns the original position to a non-ground state. The engaging member is formed in a curved shape in which the upper concave portion is opened,
The lower recessed portion is formed to be inclined at substantially the same width as the lock pin, and is formed in a long hole that can substantially accommodate the entire circumference of the lock pin.
Between these upper concave part and lower concave part, it is formed by forming a convex part whose tip is formed in an arc shape,
When the operating member is pushed down from the non-grounding position and tilts, the lock pin is retracted against the spring biasing force, the operating member reaches the grounding position at a predetermined tilt angle, and the slot and the slot match. Then, the seismic isolation device according to claim 7, wherein the lock pin is guided into the elongated hole to lock the operation member. The unlocking operation member includes a rotating part that is fitted to one end of the shaft member so as to be relatively rotatable, an unlocking operation part that extends outward from the rotating part and projects outward from the attached body, Each of which is provided with a bent portion that extends inward from the rotating portion and contacts the lock pin,
9. The seismic isolation device according to claim 8, wherein when the unlocking operation portion is pressed in one direction, the lock pin is retracted against the urging force of the spring and separated from the lower elongated hole of the engagement member. .   A pair of grounding devices are provided at the outer edge corners of the mounted body, and the operation member is constituted by a single operation member that connects between the engaging members of the holding mechanisms respectively corresponding to these grounding devices. The seismic isolation device according to any one of 6 to 9. On the outer edge corner of the mounted body, on the side facing the pair of grounding devices, another grounding device is provided facing each other at an equal distance from the pair of grounding devices,
While projecting the shaft member from the mounting member of these other grounding devices,
11. The seismic isolation device according to claim 10, wherein a transmission mechanism in which a shaft member of a pair of grounding devices and a shaft member of another grounding device are coupled so as to be able to transmit an external force is provided for each different row.   The seismic isolation device according to any one of claims 1 to 11, wherein the attached body is provided with a leg or a caster that secures a gap between the bottom surface of the attached body and the floor.   The seismic isolation device according to claim 12, wherein the operating member is provided on the same axis as the pivot shaft of the caster. A shaft member that is pivotally supported, has one end connected to the operating device and switches the operating device between an operating state and a non-operating state, and is connected to the shaft member and rotates the shaft member to operate the operating device. An operation member, and
When the operating member is swung in one direction, the operating member is locked at a predetermined position to hold the operating device in an operating state.
The lock mechanism includes a lock release operation member that, when pressed, releases the lock of the operation member and returns the operation member to its original position, thereby bringing the operation device into a non-operation state. The locking mechanism is attached to the bottom surface of the body to be mounted and pivotally supports the other end of the shaft member, and is fitted to the other end of the shaft member accommodated in the mounting member, and has one end swinging edge portion. An engagement member connected to the operation member and having a recessed portion formed at the other end swinging edge portion with a circumferential position different from the shaft member, and a slit formed in the attachment member, and the other A lock pin that is inserted through the end swinging edge part so as to be movable forward and backward, and a spring that biases the lock pin toward the other end swinging edge part,
The engaging member forms the upper recessed portion into a curve in which the opening is expanded,
The lower recessed portion is formed to be inclined at substantially the same width as the lock pin, and is formed into a long hole that can substantially accommodate the entire periphery of the lock pin.
Between these upper concave part and lower concave part, it is formed by forming a convex part whose tip is formed in an arc shape,
When the operating member is pushed downward from the non-operating position and tilts, the lock pin is retracted against the biasing force of the spring, the operating member reaches the operating position with a predetermined tilt angle, and the slot and the slot match. The lock device according to claim 14, wherein the lock device is configured to lock the operation member by introducing the lock pin into the elongated hole.   The lock device according to claim 15, comprising the unlocking operation member according to claim 9. A caster body that is pivotably attached to the mounted body via a support member and has a pivot shaft, and a wheel that is pivotally supported by the caster body,
A grounding device having a grounding part having elasticity that can move up and down on the same axis as the pivot axis;
An operation mechanism that is connected to the grounding portion of the grounding device so that an external force can be transmitted, and that displaces the operation member to bring the grounding portion into and out of the floor
A seismic isolation device comprising a seismic isolation device having a holding mechanism for holding the grounding portion at an upper non-grounding position and a lower grounding position in accordance with the displacement of the operation member. Casters. The grounding device has an upper end that protrudes from the support member while preventing it from falling off, is slidably fitted to the pivot shaft, and has a grounding portion attached to the lower end, and can swing on the support member A swing mechanism that has a swing member that is pivotally supported by the shaft and moves the operating member up and down.
The operation mechanism includes a shaft member connected on the same axis as the swing member, and the operation member is connected to the shaft member via a holding mechanism to rotate the shaft member. A caster comprising the seismic isolation device according to claim 17.   The caster provided with the seismic isolation device according to claim 18, comprising the swing mechanism according to claim 3.   The caster provided with the seismic isolation device according to claim 19, comprising the second urging member according to claim 5.   The caster provided with the seismic isolation device according to any one of claims 17 to 20, wherein the holding mechanism is the holding mechanism according to any one of claims 6 to 9.

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