JP5468358B2 - Multiple caster locking mechanism - Google Patents

Description

  The present invention relates to a lock mechanism for a plurality of casters attached to furniture such as a floor head.

  Generally, in furniture having casters, the casters are attached to the bottom plate of the furniture. The bottom plate has predetermined dimensions in the vertical and horizontal directions according to the usage pattern, and the casters are arranged in a well-balanced manner at the four corners of the bottom plate having this wide surface. These casters are mounted so as to be retracted inward from the four corners of the bottom plate so as not to get in the way of protruding outside when storing furniture. Conventionally, as a lock mechanism of a plurality of casters attached to such furniture, a mechanism is known in which braking means for braking a wheel is connected to an operation lever through a wire and braked by remote operation (for example, , See Patent Document 1). In the invention described in Patent Document 1, since the operation is performed through the wire, an extrusion mechanism that pushes the wire against the tension of the wire on the operation lever side, a spring that holds the tension of the wire, A spring for braking the wheel against the tension, a plurality of pulleys installed in response to the drawing of the wire, and a wire passage for ensuring a space where the wire does not interfere with each other are provided.

  Also, as a locking mechanism for multiple casters provided on the legs of furniture, a pair of casters provided on the front and rear of the leg base, locking means for locking these casters, and operating these locking means by external force And a plate member that simultaneously transmits the operation force input to the operation means to the lock means, and is configured to simultaneously perform the lock operation and the lock release operation of the pair of lock means. (For example, refer to Patent Document 2). In the invention described in Patent Document 2, when the engaging member bends and deforms according to the vertical movement of the button, the plate member slides in the horizontal direction by the pivot shaft inserted into the long hole of the side piece, and the lock lever is moved. Displacement is performed to lock and unlock the caster's turning and rolling.

Japanese Patent Laid-Open No. 11-48704 JP 2006-96327 A

  However, the multi-caster locking mechanism disclosed in Patent Documents 1 and 2 has a problem that the structure is complicated, the number of parts is large, and the cost is increased. In particular, the invention of Patent Document 2 has a problem that although either the left or right caster of the leg can be locked simultaneously by sliding the plate member in the horizontal direction, not all casters can be locked simultaneously. .

  The present invention has been made to solve the above-described problems, and provides a multi-caster locking mechanism that can simultaneously and reliably lock or unlock all casters attached to a wide bottom surface with a simple structure. It is for the purpose.

A lock mechanism of a plurality of casters according to claim 1 of the present invention is a lock mechanism of a plurality of casters that locks a plurality of casters attached to a mounted body, and is arranged at a corner of a bottom surface of the mounted body. A mounting member that is pivotably attached to the mounted body, a brake member that is displaceably accommodated in a caster body that is rotatably supported by a wheel, and one end protrudes to the outside, and the brake member is displaced to turn the caster. Caster lock means for locking or unlocking the rotation of the wheels, shafts provided on the mounting members arranged in a line in the same direction and having the same axial center as the shafts, and rotatably mounted on the shafts. An operating member that contacts and operates the braking member, and a transmission link that couples the shafts provided in the mounting members of different rows and transmits the rotation of the shaft of one row to the shaft of the other row in the same direction. The interlocking means for transmitting the rotational force applied to the shaft to the braking member via the operating member, and one end connected to the shaft, the other end extended outward, and when the other end is given external force, the shaft is rotated. and an operating means for moving Rutotomoni, the caster body, a longitudinal hole is pierced vertically to the pivot axis on the same axis and formed on the pivot shaft side, uneven portions on the inside of the wheel along the circumferential direction The caster lock means includes a brake rod inserted through the vertical hole so as to freely move up and down, a pin inserted through the upper end of the brake rod, and a brake rod interposed between the brake rod and the caster body. A spring that urges the brake rod downward, an anti-rotation engaging portion that is provided at the lower end of the brake rod and has a concavo-convex portion on the lower side, and one end pivotally attached to the caster body so as to be swingable. The wheel whose oscillating end extends below the anti-rotation engaging portion The wheel lock member is formed with an uneven portion that engages with the anti-rotation engaging portion on the upper end of the rocking end of the wheel lock member, and can be freely engaged with and disengaged from the uneven portion in the circumferential direction of the wheel on the lower side. A rotation stop engaging portion that engages with the brake rod is provided, and an operating member is arranged below the pin inserted through the brake rod so that the pin can be pushed up .

The multiple caster locking mechanism according to claim 1 of the present invention is a multiple caster locking mechanism that locks a plurality of casters attached to a mounted body, and is disposed at a corner of the bottom surface of the mounted body, A mounting member that is pivotably attached to the mounted body, a brake member that is displaceably accommodated in a caster body that is rotatably supported by a wheel, and one end protrudes to the outside, and the brake member is displaced to turn the caster. Caster lock means for locking or unlocking the rotation of the wheels, shafts provided on the mounting members arranged in a line in the same direction and having the same axial center as the shafts, and rotatably mounted on the shafts. An operating member that contacts and operates the braking member, and a transmission link that couples the shafts provided in the mounting members of different rows and transmits the rotation of the shaft of one row to the shaft of the other row in the same direction An interlocking means for transmitting the rotational force applied to the shaft to the braking member via the operating member, and one end connected to the shaft, the other end extended outward, and an external force is applied to the other end to rotate the shaft. and an operating means for moving Rutotomoni, the caster body, a longitudinal hole is pierced vertically to the pivot axis on the same axis and formed on the pivot shaft side, uneven portions on the inside of the wheel along the circumferential direction The caster lock means includes a brake rod inserted through the vertical hole so as to be movable up and down, a pin inserted through the upper end of the brake rod, and a brake rod interposed between the brake rod and the caster body. A spring that urges the brake rod downward, an anti-rotation engaging portion that is provided at the lower end of the brake rod and has a concavo-convex portion on the lower side, and one end pivotally attached to the caster body so as to be swingable. A vehicle whose oscillating end extends below the anti-rotation engaging portion. A locking member is formed on the upper end of the rocking end of the wheel locking member, and an uneven portion that engages with the anti-rotation engaging portion is formed on the lower side. In addition to providing an anti-rotation engaging part to be engaged, an operating member is arranged below the pin inserted through the brake rod so that the pin can be pushed up, so that an external force is applied to the other end of the operating means. When operated, the axis of one row rotates, and this rotation is also transmitted to the axis of a different row via the transmission link, and the operation member operates the brake member of each caster, and the rotation of all casters and the wheel When the rotation is locked at the same time and an external force in the direction opposite to the external force applied to the other end of the operating means is applied, the operating member returns to its original position, and each braking member also returns to its original position along with the operation of the operating member. Return to, and unlock all casters at the same time. Further, when the shaft is rotated by the operating means and the operating member pushes the pin upward against the spring force of the spring, the brake rod is displaced upward, and the anti-rotation engaging portion is the swing end of the wheel lock member. The engagement with the concavo-convex portion is released and the turning lock is released, and the anti-rotation engaging portion is disengaged from the circumferential concavo-convex portion of the wheel, and the rotation lock of the wheel is released. When the shaft is rotated in the reverse direction by the operating means, the operating member is displaced downward, the braking rod is elastically returned downward by the elastic force of the spring, and the anti-rotation engaging portion at the lower end of the braking rod is wheel-locked. Rotation is locked by engaging with the concavo-convex part on the upper part of the swinging end of the member, and the lock member of the wheel is pushed downward with the swinging end engaged with the pivoting stop engaging part by lowering of the pivoting stop engaging part The rotation stop engaging portion engages with the circumferential uneven portion of the wheel to lock the rotation of the wheel.

The lock mechanism of a plurality of casters according to claim 2 of the present invention is characterized in that the casters are attached to the attachment member so that the braking member is disposed on one of predetermined sides of the shaft with respect to the shaft core. To do.

In the multiple caster locking mechanism according to claim 2 of the present invention, the caster is attached to the attachment member so that the braking member is disposed on one of predetermined sides of the shaft core. Thus, if the locking direction due to the displacement of the braking member is made the same, the shaft rotates in the same direction according to the operating direction of the operating means, and the operating members are also moved in the same direction. Canceled.

  The lock mechanism of a plurality of casters according to claim 3 of the present invention is characterized in that mounting members in different rows are arranged to face each other and the shaft is divided for each mounting member.

  In the multiple caster locking mechanism according to claim 3 of the present invention, the mounting members in different rows are arranged to face each other, and the shafts are divided for each mounting member, so that the shafts in different rows are connected to each other. Therefore, the shafts in different rows are transmitted in the same direction through the transmission link, and all casters are locked or unlocked at the same time. Furthermore, by dividing the shaft, the shaft size can be shortened, and the cost can be reduced.

  A lock mechanism for a plurality of casters according to claim 4 of the present invention is characterized in that the divided shafts of one row are connected via an operating means.

  In the lock mechanism of a plurality of casters according to claim 4 of the present invention, since the divided shafts of one row are connected via the operating means, the axial length of the operating means can be shortened and the cost can be reduced. You can go down.

In the multiple caster locking mechanism according to claim 5 of the present invention, the operating means is constituted by an operating tool having one end connected to the shaft and the other end operating portion protruding outwardly, and the operating tool and the attached body include The operation tool is provided with an operation tool lock mechanism that restricts both the vertical swing end positions of the operation tool and holds the operation unit at each swing end position on one end portion side of the operation tool. .

In the lock mechanism of a plurality of casters according to claim 5 of the present invention, the operation means is constituted by an operation tool having one end connected to the shaft and the other end operation portion protruding outward, and the operation tool and the attached body include The operation tool is provided with an operation tool lock mechanism that restricts both the vertical swing end positions of the operation tool and holds the operation unit at each swing end position on one end portion side of the operation tool. When the operation tool reaches the lower swing end position, the operation tool is held at the lower swing end position by the operation tool lock mechanism. For this reason, all casters are locked or unlocked. When the other end operating portion of the operation tool is pulled up and the operation tool reaches the upper swing end position, the operation tool is held at the upper swing end position by being further displaced by the operation tool lock mechanism. For this reason, all casters are unlocked when the operation tool is locked at the lower oscillating end position, and reversely locked when the operation tool is unlocked at the lower oscillating end position. It becomes a state.

The locking mechanism for a plurality of casters according to claim 6 of the present invention is such that the operating tool locking mechanism is attached to the body to be attached and accommodates one end of the operating tool on the connection side together with the shaft, and one end of the operating tool Is attached to the outer edge of the outer plate and has a groove formed in a circumferential groove with a different circumferential position, and a pair of elongated holes formed in the left and right walls of the support member. An engagement pin that faces the outer edge of the plate and is elastically urged to a concave groove of the engagement plate via a spring is configured.

In the lock mechanism of a plurality of casters according to claim 6 of the present invention, the operating tool locking mechanism is attached to the body to be attached and accommodates one end of the operating tool on the connection side together with the shaft, and one end of the operating tool Is attached to the outer edge of the outer plate and has a groove formed in a circumferential groove with a different circumferential position, and a pair of elongated holes formed in the left and right walls of the support member. An engagement pin that faces the outer edge of the plate and is elastically biased to the concave groove of the engagement plate via a spring is provided, so that an external force in one direction is applied to the other end operation portion of the operation tool. The engagement plate rotates in response to the rotation of the shaft, and the engagement pin is pushed out from one concave groove of the engagement plate against the spring force of the spring and formed on the outer edge of the engagement plate. It fits into the other concave groove and is elastically biased by a spring. For this reason, when the operating tool reaches the lower swing end position, the operation tool is restrained from being displaced further and held at the lower swing end position. On the other hand, when a reverse external force is applied to the other end operation portion of the operation tool, the engagement plate rotates in the reverse direction according to the rotation of the shaft, and the engagement pin engages against the spring force of the spring. The plate is pushed out from the other groove of the plate and fitted into the groove, and is elastically biased by a spring. For this reason, when the operating tool reaches the upper swing end position, the further displacement of the operating tool is restricted and held at the upper swing end position.

In the lock mechanism for a plurality of casters according to claim 7 of the present invention , the vertical hole is formed to have a square cross section through the vertical axis on the same axis of the turning shaft, and substantially matches the shape of the vertical hole. The brake rod is inserted into the vertical hole so as to be movable up and down, and both are used to prevent rotation .

In the multiple caster locking mechanism according to the seventh aspect of the present invention , the vertical hole is vertically formed on the same axis of the turning shaft so as to have an angular cross section, and is formed substantially in accordance with the shape of the vertical hole. Since the brake rod is inserted into the vertical hole so as to be movable up and down, and both are prevented from rotating, the brake rod is prevented from rotating with respect to the caster body. Is securely engaged with the concavo-convex portion on the upper side of the rocking end of the wheel lock member disposed below, and the lock is reliably performed.

A lock mechanism for a plurality of casters according to the present invention is a lock mechanism for a plurality of casters that locks a plurality of casters attached to a body to be mounted, and is disposed at a corner of the bottom surface of the body to be mounted. A mounting member that is pivotably mounted, a caster body that rotatably supports a wheel, a brake member that is displaceably accommodated, and one end projecting outside, and the brake member is displaced to turn the caster and rotate the wheel. Caster lock means for locking or unlocking the shaft, shafts provided on the mounting members arranged in a line in the same direction so as to be rotatable with the same axial center, and a braking member attached to these shafts and contacting the braking member And a transmission link for connecting the shafts provided in the mounting members of different rows and transmitting the rotation of the shafts of one row to the shafts of the other row in the same direction. Interlocking means for transmitting the obtained rotational force to the braking member via the operating member, and operating means for rotating the shaft when one end is connected to the shaft, the other end is extended outward, and an external force is applied to the other end Rutotomoni with the door, the caster body, a longitudinal hole is pierced vertically to the pivot axis on the same axis and formed on the pivot shaft side, the inner side of the wheel to form a concave-convex portion in the circumferential direction The caster lock means is arranged between the brake rod inserted into the vertical hole so as to be movable up and down, the pin inserted into the upper end side of the brake rod, and the brake rod and the caster body. A spring to be energized, a swivel engaging portion provided at the lower end of the brake rod and having a concavo-convex portion formed on the lower side, and one end pivotally attached to the caster body so as to be oscillated constantly by the spring. Wheel lock member whose moving end extends below the pivot stop engaging portion An uneven portion that engages with the anti-rotation engaging portion is formed on the upper side of the rocking end of the wheel lock member, and the lower side is removably engaged with the uneven portion on the circumferential direction of the wheel. Since the rotation stop engaging part is provided and the operation member is arranged below the pin inserted through the brake rod so that the pin can be pushed up , all casters can be locked or unlocked at the same time and securely. In addition, the structure can be simplified and the cost can be reduced.

FIG. 1 is an explanatory view showing furniture provided with a lock mechanism of a plurality of casters according to a first embodiment of the present invention. Example 1 FIG. 2 is a perspective view showing a lock mechanism of the plurality of casters of FIG. FIG. 3 is a partially omitted illustration of the main part of the state in which the lock mechanism of the plurality of casters of FIG. 1 is attached to the bottom surface of the furniture. 4 is a plan view showing an attachment member attached to a caster of the lock mechanism of the plurality of casters of FIG. FIG. 5 is a partially broken side view showing an attachment member attached to the caster of FIG. 6A to 6C are a cross-sectional view and a cross-sectional view of the brake rod, respectively, showing when the caster of FIG. 2 is locked and unlocked, respectively. 7A and 7B are a side view showing a brake rod of the caster of FIG. 2 and an explanatory view of the caster main body of FIG. 2 as viewed from below. FIG. 8 is a side view showing the operation tool of the lock mechanism of the plurality of casters and the operation tool lock mechanism of FIG. FIG. 9 is an explanatory view showing the operation of the operation tool locking mechanism of FIG. FIG. 10 is a perspective view showing a lock mechanism of a plurality of casters according to a modification of the first embodiment of the present invention. (Example 2) FIG. 11 is a perspective view showing a lock mechanism of a plurality of casters according to the second embodiment of the present invention. (Example 3) FIG. 12 is a side view showing the operation tool and the operation tool lock mechanism of the lock mechanism of the plurality of casters of FIG. FIG. 13 is a partially omitted explanatory view of a main part when a state in which a lock mechanism of a plurality of casters according to a third embodiment of the present invention is attached to the bottom surface of the furniture is seen from above. Example 4 FIG. 14 is a front view showing a state in which the casters of the lock mechanism of the plurality of casters of FIG. 13 are attached to the attachment member. FIG. 15 is a plan view showing an attachment member attached to the caster of FIG. FIG. 16 is a side view showing the caster and the mounting member of FIG. FIG. 17 is a table showing the relationship between the arrangement of the brake rod, the operation end position of the operation tool, and the lock or unlocking of the casters for each example.

  A lock mechanism for a plurality of casters that locks a plurality of casters attached to a body to be attached for the purpose of simplifying a lock mechanism for simultaneously locking or unlocking a plurality of casters attached to four corners of a furniture bottom. The mounting member is arranged at the corner of the bottom surface of the mounted body and pivotally mounts the caster to the mounted body, and the brake rod is housed in the caster body, which is rotatably supported by the wheel, so that one end is externally mounted. The caster lock mechanism that locks or unlocks the turning of the caster and the rotation of the wheel by projecting the brake rod forward and backward, and the mounting member arranged in a line in the same direction can rotate freely with the same axis Shafts mounted on the shafts, operating members that are attached to these shafts to contact the brake rods and operate the brake rods, and shafts provided on the mounting members in different rows And a transmission link that transmits the rotation of the shaft of one row to the shaft of the other row in the same direction, and configured to transmit the rotational force applied to the shaft to the brake rod via the operating member. This is realized by comprising an operating tool for rotating the shaft when one end is connected to the shaft, the other end is extended outward, and an external force is applied to the other end.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. As shown in FIG. 1, the lock mechanism 2 for a plurality of casters according to the first embodiment of the present invention is provided on the bottom 4 of furniture 3 such as a floor head. The casters 5 (5A to 5D) are attached to the four corners of the bottom 4 of the furniture 3 by retreating them inward via attachment members 6 (6FR, 6FL, 6RR, 6RL, see FIG. 3). The attachment member 6 is configured to attach the caster 5 to the bottom portion 4 so as to be rotatable. Two attachment members 6 are attached to the front side of the bottom portion 4 in one row (see attachment members 6FR and 6FL) and two attachment members 6 in the rear side (see attachment members 6RR and 6RL). The attachment members 6FR, 6FL and 6RR, 6RL arranged in different rows in the front and rear are arranged to face each other in the front and rear (the front left attachment member 6FL and the rear left attachment member 6RL). , See the front right mounting member 6FR and the rear right mounting member 6RR).

  The caster 5 is a twin-wheel type caster, and as shown in FIGS. 5 and 6A and 6B, a pair of wheels 11 are rotatably supported on the left and right sides of the caster body 10 via an axle 12. Configured. The caster body 10 is formed with a through hole 14 penetrating vertically at a position eccentric to the front side in the traveling direction from the axle 12, and the turning shaft 13 is rotatably fitted in the through hole 14. A screw portion 13A is formed on the upper portion of the pivot shaft 13, and a flange portion 15 for rotating the pivot shaft 13 is provided at an intermediate portion thereof. The flange portion 15 has a shape in which both sides of a circle are cut out flat, and a tool such as a spanner can be engaged with the flat surface 15A. The lower end of the pivot shaft 13 protrudes from the lower opening of the through hole 14, and a pin 18 is press-fitted into the small diameter portion 13 </ b> B of the pivot shaft 13 to prevent the caster body 10 from coming off. The left and right wheels 11, 11 are formed such that the surface on the caster body 10 side is annularly recessed, and an uneven portion 17 is formed along the outer peripheral surface of the annular recessed portion.

  An attachment member 6 is attached to the turning shaft 13. As shown in FIGS. 4 and 5, the mounting member 6 has a U-shaped body having a bottom portion 6A and left and right walls 6B and 6C rising from the left and right sides of the bottom portion 6A, and the upper ends of the walls 6B and 6C outward. And a bent portion 6E formed by bending and having a mounting hole 6D formed in the bottom 4 of the furniture 3. As for the attachment member 6, the bending part 6E is attached to the bottom part 4 of the furniture 3 with a screw. A circular hole 6H that is loosely inserted into the threaded portion 13A of the pivot shaft 13 is formed in the bottom portion 6A of the mounting member 6, and through holes 6G and 6G that are opposed to each other and penetrate the left and right walls 6B and 6C from the circular hole 6H. Each is formed on the rear side. The attachment member 6 is sandwiched between the nut 16 and the flange portion 15 when the screw portion 13A of the turning shaft 13 is inserted into the circular hole 6H, the bottom portion 6A is placed on the flange portion 15 and the nut 16 is screwed into the screw portion 13A. It has come to be. Thus, the attachment member 6 moves integrally with the turning shaft 13. For this reason, when the attachment member 6 is attached to the bottom portion 4 of the furniture 3, the caster 5 rotates with respect to the attachment member 6. As shown in FIG. 3, the casters 5 are attached to the four corners of the bottom 4 of the furniture 3 via attachment members 6FR, 6FL, 6RR, and 6RL.

  As shown in FIGS. 5 and 6 (A) and (B), the caster 5 is provided with a caster lock mechanism (caster lock means) 20 that simultaneously locks the turning of the turning shaft 13 and the rotation of the wheel 11. . The caster lock mechanism 20 is formed with a vertical hole 21 (see FIG. 6A) having a regular hexagonal cross section that is vertically penetrated on the same axis as the pivot shaft 13. A (braking member) 22 is inserted so as to be movable up and down. The outer surface of the brake rod 22 is formed so as to substantially match the shape of the vertical hole 21 (see FIG. 6C). The upper end of the brake rod 22 protrudes from the upper end opening of the vertical hole 21, and a disc-shaped contact member 23 is attached to the upper end. A spring 24 is provided between the contact member 23 and the upper end surface of the pivot shaft 13 to elastically bias the brake rod 22 upward. The lower end of the brake rod 22 protrudes from the lower end opening of the vertical hole 21, and a turning stop engaging portion 25 is provided at the protruding end. The anti-rotation engaging portion 25 is configured such that an uneven portion 26 is formed along the circumferential direction on the lower side of the cylindrical main body.

  A wheel lock member 30 is provided on the caster body 10. One end of the wheel lock member 30 is pivotally attached to the rear part of the caster body 10 by a pin 28 so as to be swingable. The wheel lock member 30 is always urged upward by a spring 27, and the swing end 31 on the front side is an anti-rotation engaging portion. 25 extends downward. On the upper surface of the swing end 31 of the wheel lock member 30, an uneven portion 32 that engages with the uneven portion 26 of the anti-rotation engaging portion 25 is formed. On the lower side of the wheel lock member 30, a rotation stop engaging portion 33 that is detachably engaged with the circumferential uneven portion 17 of the wheels 11, 11 is provided. The anti-rotation engagement portion 33 is attached at a right angle to the lower side of the arm-shaped wheel lock member 30 so as to engage with the circumferential concavo-convex portion 17 of the left and right wheels 11, 11, and claw portions are formed at both ends extending left and right. It has become so. As described above, the caster lock mechanism 20 is configured to include the brake rod 22, the anti-rotation engagement portion 25, the wheel lock member 30, and the uneven portions 17, 26, 32, and 33.

  When the abutment member 23 is pushed downward against the elastic force of the spring 24 by an external force and the brake rod 22 is displaced downward, the caster lock mechanism 20 causes the lower uneven portion 26 of the anti-rotation engagement portion 25 to be moved. The wheel lock member 30 engages with the concavo-convex portion 32 on the upper surface of the oscillating end to lock the turning, and the wheel lock member 30 descends the anti-rotation engaging portion 25 so that the oscillating end concavo-convex portion 32 engages with the anti-rotation. It is pushed down against the urging force of the spring 27 in the state of being engaged with the portion 25, so that the rotation stop engaging portion 33 is engaged with the circumferential uneven portion 17 of the wheel and the rotation of the wheel 11 is locked. It has become. When the external force on the contact member 23 is lost, the contact member 23 is pushed up by the elastic force of the spring 24, the brake rod 22 is displaced upward, and the anti-rotation engaging portion 25 at the lower end of the brake rod 22 is displaced upward. To do. Then, the turning stop engaging portion 25 is disengaged from the rocking end uneven portion 32 of the wheel lock member 30 and the turning lock is released. At the same time, since the anti-rotation engaging portion 25 is displaced upward, the wheel lock member 30 is elastically returned upward by the spring 27, and the anti-rotation engaging portion 33 is engaged with the circumferential uneven portion 17 of the wheel 11. It is unlocked and the wheel rotation lock is released.

  By the way, in the lock mechanism 2 of a plurality of casters according to the present embodiment, the left and right mounting members 6FL and 6FR mounted on the front side among the four corners of the bottom portion 4 of the furniture 3 are arranged between the both mounting members 6FL and 6FR. And a single shaft (interlocking means) 40 that is rotatably supported by the through hole 6G via the sliding member 43 is provided. Of the four corners of the bottom 4 of the furniture 3, of the left and right attachment members 6RL and 6RR attached to the rear side, the left attachment member 6RL has a shaft (interlocking means) 41A and a right attachment member 6RR. Are provided with shafts (interlocking means) 41B, which are rotatably supported by the through hole 6G via the sliding member 43. These rear shafts 41A and 41B are arranged with their axes aligned with each other. The inner end portions 41Aa and 41Ba of the rear shafts 41A and 41B protrude from the attachment members 6RL and 6RR, respectively. The front side shaft 40 and the rear side shafts 41A and 41B are arranged with their axial centers facing in the left-right direction. That is, both shafts 41A and 41B having the same axial center on the rear side are arranged in parallel to the shaft 40 on the front side. Further, since these shafts 40, 41A, 41B are rotatably disposed in the through holes 6G, they are disposed on the rear side of the circular holes 6H formed in the attachment members 6FL, 6FR, 6RL, 6RR. That is, the brake rod 22 protruding upward from the pivot shaft 13 of the caster body 10 is arranged on the front side with respect to the respective shafts 40, 41A, 41B. The shafts 40, 41 </ b> A, and 41 </ b> B may have a round bar shape with a circular cross section or a square bar shape with a square cross section as long as a predetermined strength can be secured.

  An operation tool (operation means) 50 is connected to the shaft 40 on the front side. The operation tool 50 is formed by bending a pipe into a U-shape, branch ends 52 and 53 are connected to the shaft 40 on the front side, and an operation unit 51 extending from the branch ends 52 and 53 is formed by hands or feet. For easy operation, the furniture 3 is exposed by protruding outward from the bottom 4. The operating tool 50 rotates the shaft 40 when an external force is applied to the operating portion 51. The operating tool 50 is locked at the upper and lower swing end positions with the swing range restricted by an operating tool lock mechanism described later.

  The front and rear shafts 40 and 41A, 41B have a left transmission link (interlocking means) 54 for connecting the front shaft 40 and the rear left shaft 41A, and the front shaft 40 and the rear right shaft. Right transmission links (interlocking means) 55 for connecting the shafts 41B are provided (see FIG. 3). The left and right transmission links 54 and 55 respectively connect the support members 56 and 56 attached to the front shaft 40 and the support members 57 and 57 attached to the rear shafts 41A and 41B, respectively. The rotational force of the front side shaft 40 which is coupled by a pin and is given by the operation of the operation tool 50 is transmitted to the rear side shafts 41A and 41B in the same direction.

  Each shaft 40, 41A, 41B is provided with an operation member 42 (42A-42D) (interlocking means) for moving the brake rod 22 downward in accordance with the rotation of the shaft 40, 41A, 41B. As shown in FIG. 5, the operating member 42 has a base 44 at one end fixed to the shafts 40, 41 </ b> A, 41 </ b> B inside the mounting member 6, and a round bar 45 at the other end integrated with the shafts 40, 41 </ b> A, 41 </ b> B. And is brought into contact with the contact member 23 of the brake rod 22. For this reason, when the operation part 51 of the operation tool 50 is pushed down, the round bar part 45 of the operation member 42 with which the front shaft 40 moves integrally is brought into contact with the contact member 23 and pushed down (the shaft 40 in FIG. 5). , 41A, 41B (refer to the counterclockwise direction), and this rotational force is transmitted to the rear shafts 41A, 41B via the transmission links 54, 55. The rear shafts 41A and 41B to which the rotational force is transmitted also rotate in a direction in which the round bar portion 45 of the operation member 42 that moves integrally is brought into contact with the contact member 23 and pushed down. Thus, when the operation portion 51 is pushed down, the shafts 40, 41A, 41B rotate and the other end round bar portion 45 of the operation member 42 fixed to the shafts 40, 41A, 41B is brought into contact with the contact member. When the brake rod 22 is further pushed down against the spring force of the spring 24, the brake rod 22 is pushed down so that the turning of the caster 5 is locked and the rotation of the wheel 11 is also locked. It has become. When the push-down force is lost from the operation portion 51 of the operation tool 50, the brake rod 22 is displaced upward by the elastic force of the spring 24 and pushes up the operation member 42, so that each shaft 40, 41A, 41B is moved in the opposite direction (see FIG. 5 (see the clockwise direction of the shafts 40 and 40B) to return the operation unit 51 to the original position. Then, when the brake rod 22 returns to the upper end position, the turning lock of the caster 5 is released and the rotation lock of the wheel 11 is also released. As described above, in this embodiment, the shaft cores of the shafts 40, 41A, and 41B are arranged so as to be aligned in the left-right direction, the brake rod 22 is disposed on the front side with respect to the shaft core, and the operation tool 50 is pivoted. It is arranged on the front side from the core. For this reason, a lever is formed with the shaft core as a fulcrum, the operation part 51 as a power point, and the brake rod 22 as an action point, and the brake rod 22 is arranged between the fulcrum (axis core) and the force point (operation part 51). Therefore, when the operation portion 51 is locked (when the push-down operation is performed), the pressing force is received from the round bar portion 25 of the operation member 42 in the same direction as the operation direction.

  As shown in FIG. 3 and FIG. 8, the furniture 3 and the operation tool 50 are arranged in the vertical direction of the operation tool 50 at portions where the branch ends 52 and 53 of the operation tool 50 and the shaft 40 on the front side are respectively connected. An operating tool lock mechanism 60 that restricts both the swing end positions and holds the operation unit 51 at each swing end position is provided. The operation tool lock mechanism 60 is attached to the bottom portion 4 of the furniture 3, and includes a support tool 61 through which the front side shaft 40 penetrates and accommodates the connection side end portions 52 and 53 of the operation tool 50. The support 61 is formed by bending the left and right side walls 61A and 61B, the rear wall 61C connected to the both side walls 61A and 61B, and the upper ends of the left and right side walls 61A and 61B outward. 4 is provided with bent portions 61E and 61F in which attachment holes 61D to 4 are formed. As for the support tool 61, the bending parts 61E and 61F are attached to the bottom part 4 of the furniture 3 with a screw.

  Engagement plates 62 having concave grooves 62A and 62B formed on the outer edges at different circumferential positions with respect to the shaft 40 are attached to the connection side ends of the operation tool 50, that is, the branch ends 52 and 53, respectively. It is done. A pair of long holes 63, 63 are formed in the left and right walls 61A, 61B of the support 61 so as to face each other, and an engagement pin 64 is inserted into the long holes 63, 63 so as to be movable back and forth. The engagement pin 64 faces the outer edge of the engagement plate 62 and is elastically biased to one of the concave grooves 62A and 62B of the engagement plate 62 via a spring 65. That is, when the operation portion 51 of the operation tool 50 is in the upper position, the engagement pin 64 is pressed against the upper concave groove 62A of the engagement plate 62 to hold the operation tool 50 in the upper end position. . At this time, since the round bar portion 45 of the operation member 42 of each shaft 40, 41A, 41B is held at the upper position, the brake rod 22 is biased to the upper position by the spring 24, and the caster 5 is pivotable. 11 is in a freely rotatable state.

  When the operating portion 51 of the operating tool 50 is operated and pushed down to the lower position, the engaging plate 62 rotates around the shaft 40 integrally with the branch ends 52 and 53, and the engaging pin 64 applies the elastic force of the spring 65. While being received, it is separated from the concave groove 62A and once pushed rearward along the outer edge of the engagement plate 62, and when it is fitted into the lower concave groove 62B, it is elastically biased by the spring 65. Thus, the operating tool 50 is held at the lower end position when the engaging pin 64 is pressed into the lower concave groove 62B. At this time, the round bar portion 45 of the operation member 42 of each shaft 40, 41A, 41B pushes down the brake rod 22 in accordance with the depression of the operation portion 51 and is held at the lower position as it is, so that the caster 5 is turned. The wheel 11 is locked and the rotation is locked.

  As described above, the operation tool locking mechanism 60 pushes down the operation portion 51 of the operation tool 50, and when the operation portion 51 reaches the lower swing end position, the operation tool 50 is restricted from being further displaced by the lower displacement position. It is held at the moving end position. At this time, all the casters 5 </ b> A to 5 </ b> D are in a locked state for turning and rotation of the wheels 11. When the operation unit 51 of the operation tool 50 is pulled up and the operation unit 51 reaches the upper swing end position, the operation tool 50 is held at the upper swing end position by restricting further displacement. Yes. At this time, all the casters 5A to 5D are released from the turning lock and the rotation lock of the wheel 11 is released.

  Next, the operation of the multiple caster locking mechanism 2 according to the first embodiment will be described. In the lock mechanism 2 for a plurality of casters according to the above-described embodiment, when the operation unit 51 of the operation tool 50 is pushed down, the front shaft 40 is rotated, and this rotational force is transmitted through the transmission links 54 and 55 to the rear shaft. The rear shafts 41A and 41B are also rotated in the same direction as the front shaft 40. When the operation member 42 operates integrally with the rotation of the shafts 40, 41A, 41B, and the round bar portion 45 pushes down the contact member 23 against the elastic force of the spring 24, the brake rod 22 is moved to the lower end position. Displace. Since the operating tool 50 is held at the lower swing end position by the operating tool lock mechanism 60, the brake rod 22 remains held at the lower end position. For this reason, the turning stop engaging portion 25 engages with the uneven portion 32 on the upper end of the rocking end of the wheel locking member 30 to lock the turning, and the wheel locking member 30 is moved into the uneven portion by the lowering of the turning stop engaging portion 25. In the state where 32 is engaged with the anti-rotation engaging portion 25, it is pushed downward, and the anti-rotation engaging portion 33 is engaged with the circumferential uneven portion 17 of the wheel 11 to lock the rotation of the wheel 11. For this reason, only by operating the operation part 51 of the operation tool 50, turning of all the casters 5 attached to the bottom part 4 of the furniture 3 and rotation of a wheel are locked simultaneously.

  Next, when the operation portion 51 is locked at the lower swing end position, when the operation portion 51 is pulled up, the front shaft 40 rotates in the reverse direction, and the rotational force in the reverse direction is increased. The rear shafts 41A and 41B are transmitted to the rear shafts 41A and 41B through the transmission links 54 and 55, and the rear shafts 41A and 41B also rotate in the same direction as the front shaft 40. The operation member 42 operates integrally with the rotation of the shafts 40, 41A, 41B, the round bar portion 45 is displaced upward from the contact member 23, and the contact member 23 is pushed up by the elastic force of the spring 24, The brake rod 22 is held at the upper end position. Since the operating tool 50 is held at the upper swing end position by the operating tool lock mechanism 60, the brake rod 22 remains held at the upper end position. The turning stop engaging portion 25 is displaced upward, the engagement with the concavo-convex portion 32 on the upper swing end of the wheel lock member 30 is released, and the turning lock is released. At the same time, the wheel locking member 30 is displaced upward by the spring stop engaging portion 25, so that it is elastically returned upward by the spring 27, and the rotation stop engaging portion 33 is engaged with the circumferential uneven portion 17 of the wheel 11. Is released and the wheel rotation lock is released. For this reason, only by operating the operation part 51 of the operation tool 50, the turning lock of all the casters 5 attached to the bottom part 4 of the furniture 3 and the rotation lock of the wheel are simultaneously released.

  FIG. 10 shows a modified example of the locking mechanism for a plurality of casters according to the first embodiment. In the first embodiment, the front shaft is constituted by a single shaft 40. On the other hand, it has substantially the same configuration as the first embodiment except that the front shaft is split into two. That is, in the lock mechanism of the plurality of casters according to the modification of the first embodiment, the left and right attachment members 6FL and 6FR attached to the front side are respectively provided with shafts 40A and 40B that are rotatably supported. The branch ends 52 and 53 of the operating tool 50 are connected to the inner ends of the shafts 40A and 40B, respectively. The rotational force of the left front shaft 40A is transmitted to the rear shafts 41A and 41B through the left transmission link 54, and the rotational force of the right front shaft 40B is transmitted to the rear shafts 41A and 41B through the right transmission link 55, respectively. For this reason, when an external force is applied to the operation unit 51, the shafts 40A and 40B are simultaneously rotated in the same direction. With such a configuration, the shaft dimension can be shortened and the cost can be reduced.

  Next, a lock mechanism 102 for a plurality of casters according to a second embodiment of the present invention will be described with reference to FIGS. The multi-caster locking mechanism 102 according to the second embodiment of the present invention is such that the multi-caster locking mechanism 2 according to the first embodiment divides the rear shafts 41A and 41B into mounting members 6RR and 6RL. In contrast, the front shaft 140 and the rear shaft 141 are each composed of one piece, the operation tool 150 is composed of a pedal having a tread plate portion 151, and transmission. Except for the point that the link 154 is configured by one, the configuration is almost the same as that of the first embodiment. That is, in the multiple caster locking mechanism 102 according to the second embodiment, both the front mounting members 6FR, 6FL are connected between the two mounting members 6FR, 6FL and penetrated in the left-right direction so as to be rotatable. The front shaft 140 to be supported has both the rear mounting members 6RR and 6RL connected to the rear mounting shafts 6RR and 6RL. Each is provided. Support members 156 and 157 are attached to the front and rear shafts 140 and 141, respectively, and a transmission link 154 is connected between the support members 156 and 157 with pins. The transmission link 154 transmits the rotational force of the front shaft 140 to the rear shaft 141 in the same direction. An operation tool 150 is connected to the front shaft 140. The operation tool 150 has one end base connected to the front shaft 140 and is exposed to protrude outward from the bottom 4 of the furniture 3 so that the other end tread plate 151 extending from the base can be easily operated with a foot. When a downward pressing force is applied to the tread plate 151, the operation tool 150 rotates the front shaft 140 and transmits the rotational force of the front shaft 140 to the rear shaft 141 in the same direction through the transmission link 154. It is supposed to be. The operation tool 150 and the furniture 3 are provided with an operation tool lock mechanism 60 as in the first embodiment.

  As described above, in the multi-caster lock mechanism 102 according to the second embodiment, when the tread plate 151 of the operation tool 150 is pushed down, the front shaft 140 and the rear shaft 141 rotate in one direction via the transmission link 154. The operating member 42 (42A to 42D) is moved to operate to displace the brake rod 22 to the lower end and is held at that position, so that all the casters 5 and the wheels 11 are simultaneously locked. . On the other hand, when the stepping plate portion 151 of the operation tool 150 is pulled up, the front shaft 140 and the rear shaft 141 are rotated in the opposite directions via the transmission link 154 to displace the operation member 42 upward, and the brake rod 22 is moved upward. Since it is urged to the upper end by the spring 24 and is held in that position, the turning lock of all casters 5 and the rotation lock of the wheels 11 are simultaneously released. In this embodiment, the brake rod 22 is disposed on the front side with respect to the shaft cores of the shafts 140 and 141. However, when the brake rod 22 is disposed on the rear side with respect to the shaft cores of the shafts 140 and 141, The operation of the unit 151 is locked and unlocked by the operation opposite to that described above (see FIG. 17).

  Next, a lock mechanism 202 for a plurality of casters according to a third embodiment of the present invention will be described with reference to FIGS. The multi-caster locking mechanism 202 according to the third embodiment of the present invention includes the multi-caster locking mechanisms 2 and 102 according to the first and second embodiments, and the brake rod 22 of the caster 5 with the shaft 40A- It differs from the arrangement in which it is arranged on the front side with respect to the shaft cores of 41B, 140, 141, while it is arranged on the rear side with respect to the shaft core and the operation direction of the operation tool is reversed. That is, the lock mechanism 202 for a plurality of casters according to the third embodiment attaches the caster 205 to the rear side of the shafts 240A, 240B, 241A, 241B supported by the attachment members 206 (206A to 206D), and attaches the brake rod 222. The front and rear shafts 240A, 240B, 241A, and 241B are arranged on the rear side with respect to the axis. The braking rod 222 is accommodated so as to be movable up and down on the same axis of the pivot shaft 213 of the caster, and the upper end protrudes from the upper end surface of the pivot shaft 213. In the caster lock mechanism 220 according to the present embodiment, a spring (not shown) that biases the brake rod 222 downward is provided in place of the spring 24 between the caster body 210. That is, the brake rod 222 is always urged downward by a spring (not shown) and is simultaneously performed with the caster turning lock and the wheel 11 rotation lock.

  The shafts 240A, 240B, 241A, and 241B are provided with an operation member 242 that moves the brake rod 222 upward. The operating member 242 has a base 244 at one end fixed to the shafts 240A, 240B, 241A, and 241B inside the mounting member 206, and between the other end round bar 245 and the base 244, A through hole 246 through which the exposed upper part can pass is formed. When the operating member 242 is fitted into the brake rod 222 through the through hole 246, the operating member 242 is placed on the upper end surface of the pivot shaft 213. A contact pin 223 is inserted into the upper end side of the brake rod 222. That is, the operating member 242 is arranged below the contact pin 223 inserted into the brake rod 222. When the brake rod 222 is urged downward by a spring (not shown), the contact pin 223 is pressed against the upper surface of the operating member 242, and when the operating member 242 is displaced upward against the urging force of the spring (not shown), The contact pin 223 is lifted upward by the operating member 242, and the brake rod 222 is lifted upward. For this reason, when the operating tool 50 or the operating tool 150 according to the first and second embodiments is applied to the operating tool according to the present embodiment, the operating tools 50 and 151 are respectively connected to the front shafts 240A and 240B. Since it is arranged to extend forward from the core, when the operation part 51 or the footboard part 151 is in the upper end position, the brake rod 222 is pressed to the lower end position by a biasing force of a spring (not shown), The rotation of the wheel 11 is locked. When the operation unit 51 or the foot plate 151 at the upper end position is pushed down by hand or foot operation and reaches the lower end position and is locked, the operation member 242 responds to the rotation of the shafts 240A, 240B, 241A, 241B. The contact pin 223 is placed on the upper surface and pulled upward. For this reason, the brake rod 222 is held at the upper end position against a biasing force of a spring (not shown) so that the turning lock of the caster is released and the rotation lock of the wheel 11 is released. Thus, in the multiple caster locking mechanism 202 according to the third embodiment of the present invention, the operating tools 50 and 150 are disposed on the front and rear shafts 240A, 240B, 241A, and 241B (in this embodiment, By disposing the operation member 242 and the brake rod 222 on the side opposite to the front side (back side in the present embodiment), the operation directions of the operation tools 50 and 150 are reversed. In FIG. 17, the arrangement of the operation tools 50 and 151, the arrangement of the caster lock mechanisms 20 and 220, and the brake rods 22 and 222 with respect to the axial center, and the upper and lower end positions of the operation unit 51 and the tread plate unit 151 in each of the above embodiments. And the relationship between the rotation of the caster, the rotation lock, or the unlock state.

  In the multiple caster locking mechanism according to each of the above embodiments, the turning of the caster and the rotation of the wheel are locked at the same time. However, the present invention is not limited to this. Alternatively, only rotation may be locked or unlocked. That is, in the case of only the rotation lock of the caster, the wheel lock member is not provided with the rotation stop engaging portion or the caster main body is formed with an uneven portion below the vertical hole, and the rotation stop engaging portion is set to the uneven portion. The wheel lock member may be unnecessary. In the case of only the rotation lock of the wheel, the uneven portion formed at the upper part of the rocking end of the wheel lock member is formed flat, and when the lower end of the brake rod comes into contact with the rocking end of the wheel lock member and is pushed down, the brake rod It is only necessary that the pivot stop engaging portion is not engaged with the swinging end of the wheel lock member. Moreover, in each said Example, although turning of all the casters 5A-5D attached to the bottom part 4 of the furniture 3 and rotation of a wheel is locked, it is not restricted to this, A part of For the casters, for example, a lock mechanism of a plurality of casters may be applied only to the two casters 5A and 5B on the front side. Furthermore, in the first embodiment, the brake rod is elastically biased upward by a spring, and in the third embodiment, the brake rod is biased downward by a spring, but this is not limitative. Instead of this, the operating member may be engaged and interlocked with each other without using a spring. Further, in each of the above embodiments, the operation tool has one end connected to the shaft, and the operation part extending from the connection end protrudes outward from the bottom of the furniture, and is operated with the foot. However, the lower end may be connected to the shaft, the upper end may be extended upward from the bottom of the furniture, and the upper end operation unit may be operated by hand. Further, in each of the above embodiments, the shaft that is interlocked by the force from the operating tool is constituted by a round bar-shaped or square bar-shaped shaft, but the present invention is not limited to this, and a hollow pipe or a flat bar having a predetermined strength. You may comprise by. In each of the above embodiments, each of the shafts 40, 41A, 41B, 40A, 40B, 140, 141, 240A, 240B, 241A, 241B has the front and rear shafts aligned with the front and rear shafts in the left-right direction. Although it is arranged in parallel, it is not limited to this, and it may be arranged on the left and right sides so that the axis is aligned in the front and rear direction, in which case the operation tool is exposed in the lateral direction of the furniture do it. Furthermore, two attachment members are attached to the front and back sides of the bottom surface of the furniture, but the present invention is not limited to this, and two or more attachment members may be attached as long as they are arranged in a line. Further, in the above embodiment, the brake member of the caster lock mechanism is composed of a brake rod, and the brake rod is advanced and retracted to lock and unlock the caster. However, the present invention is not limited to this. The brake member operated by the above may be constituted by a swing lever having a pivot stop engaging portion at the lower end, and the caster may be locked and unlocked by swinging the swing lever. Furthermore, in each of the above embodiments, a floor head is illustrated as an attached body, but the present invention is not limited to this, and has a wide range of applications such as furniture, bedding, transport equipment, display cases, office equipment, office equipment, etc. Needless to say, this is applicable.

2 Multiple caster locking mechanism 3 Furniture (attachment)
5 Caster 6 (6FR, 6FL, 6RR, 6RL) Mounting member 10 Caster body 11 Wheel 13 Rotating shaft 20 Caster lock mechanism (Caster lock means)
22 Brake rod (brake member)
40, 41A, 41B shaft (interlocking means)
42 operation member 44 base (one end of operation means)
51 Operation part (the other end of the operation means)
50 Operation tool (operation means)

Claims (7)

A lock mechanism of a plurality of casters that locks a plurality of casters attached to a mounted body,
A mounting member that is disposed at a corner of the bottom surface of the mounted body and pivotally attaches the caster to the mounted body;
A caster lock that locks or unlocks the turning of the caster and the rotation of the wheel by displacing the braking member in the caster main body on which the wheel is rotatably supported and projecting one end to the outside and displacing the braking member. Means,
Mounting shafts that are arranged in a row in the same direction and that are pivotally provided with the same axial center, and operating members that are attached to these shafts and operate to operate the braking members in contact with the braking members. A transmission link for connecting the shafts provided in the member and transmitting the rotation of the shaft in one row to the shaft in the other row in the same direction, and a braking member for transmitting the rotational force applied to the shaft via the operation member Interlocking means to communicate to,
One end connected to the shaft, the other end is extended to the outside, with an external force is applied to the other end, and an operating means for rotating the shaft Rutotomoni,
The caster body is formed by forming a vertical hole penetrating vertically on the same axis as the pivot axis on the pivot axis side, and forming an uneven portion along the circumferential direction on the inner side of the wheel,
A caster lock means is inserted between the brake rod and the caster main body, a brake rod inserted into the vertical hole so as to be movable up and down, a pin inserted on the upper end side of the brake rod, and a spring for biasing the brake rod downward And an anti-rotation engaging portion provided at the lower end of the brake rod and having a concavo-convex portion formed on the lower side, and one end pivotally attached to the caster body and urged upward by a spring at all times. A wheel lock member extending below the swivel stop engaging portion, and an uneven portion that engages with the swivel stop engaging portion is formed on the upper end of the swing end of the wheel lock member. A rotation stop engaging portion that is detachably engaged with the circumferential concavo-convex portion is provided, and an operating member is disposed below the pin inserted through the brake rod so that the pin can be pushed up. Multi-caster locking mechanism. 2. The multi-caster locking mechanism according to claim 1, wherein the caster is attached to the attachment member such that the braking member is disposed on one side of the shafts with respect to the axis of the shaft .   The locking mechanism for a plurality of casters according to claim 1 or 2, wherein the mounting members in different rows are arranged facing each other and the shaft is divided for each mounting member.   4. The locking mechanism for a plurality of casters according to claim 3, wherein the divided shafts of one row are connected via an operating means. The operating means is composed of an operating tool having one end connected to the shaft and the other end operating part protruding outward, and the operating tool and the mounted body are provided on both ends of the operating tool in the vertical direction. the swinging end position restricting each plurality caster locking mechanism according to the operation portion in any one of the four claims 1, characterized in that the operating tool locking mechanism is provided to hold at each rotation end position . The operating tool locking mechanism is attached to the body to be attached and accommodates one end of the connecting side of the operating tool together with the shaft, and is attached to the one end of the operating tool and has a circumferential position different from that of the shaft. The engagement plate is formed with a recessed groove and a pair of elongated holes formed in the left and right walls of the support so as to be displaceable and face the outer edge of the engagement plate. 6. The locking mechanism for a plurality of casters according to claim 5 , further comprising an engaging pin that is elastically biased in the groove. A vertical hole penetrates the same axis of the swivel shaft up and down to form a square cross section, and a braking rod formed to substantially match the shape of the vertical hole is inserted through the vertical hole so that it can move up and down. The locking mechanism for a plurality of casters according to claim 1 or 2 , wherein both of them are prevented from rotating .