JP2013100011A - Braking mechanism of caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a braking mechanism of a caster capable of simultaneously regulating the turn and rotation of wheels and simultaneously releasing the regulation of the turn and rotation by easily adopting a total lock mechanism.SOLUTION: The braking mechanism is mounted at each of four corners at the bottom 2 of a moving article, repulsive forces of kick springs 4 are made to act on operation sections 3a of lock shoes 3 of front and rear casters C on both sides of the bottom 2, and the operation sections 3a are connected to ends of operation rods 5. Each center of the operation rods 5 on both sides is journaled to the bottom 2 of the moving article so as to oscillate. A cam lever 6 is connected to the operation rod 5 on either a side or both sides. By an operation of the cam lever 6, the operation rods 5 are made to oscillate to vertically elevate and lower the lock shoes 3 of the casters C. A lower peripheral end of each of the lock shoes 3 is brought into a separated state from a grounding surface of the wheel 10 of each of the casters C, or brought into a contact state with the grounding surface of the wheel 10 of each of the casters C by a frictional force.

Description

  The present invention relates to a braking mechanism for casters attached to a side table, a carriage, a cabinet, a television stand, and other boxes.

  For example, as shown in FIG. 13, the conventional caster is attached to the bottom of the transport cart T, and the operation of the operation lever L provided on the handle portion H of the transport cart T regulates or releases the turning of the wheel 31. There is something that can be done. As shown in FIGS. 14 and 15, this caster connects the upper end of the operation wire 33 pierced through the axis of the support shaft 32 to the operation lever L provided on the handle portion H of the transport cart T, and The lower end of the wire 33 is connected to one end 35a of a locking member 35 swingably attached to a wheel frame 34 pivotally attached to the support shaft 32, and the other end 35b of the locking member 35 is connected to a torsion coil spring 36. It is assumed that the urging force is obtained and locked in a locking groove 37a provided in the fixed plate 37 below the support shaft 32 (Patent Document 1).

  The conventional caster configured as described above has the other end of the locking member 35 attached to the wheel frame 34 as shown in FIG. 14 in a state where the operation lever L is not operated (the state indicated by the solid line in FIG. 13). 35b obtains the urging force of the torsion coil spring 36 and is locked in a locking groove 37a provided in the fixed plate 37 below the support shaft 32, so that the wheel frame 34 and the fixed plate 37 are engaged. Thus, the wheel frame 34 does not turn, and as a result, the wheel 31 attached to the wheel frame 34 is also in a locked state in which turning is restricted.

  Further, in the conventional caster, when the operation lever L is operated (the state of the phantom line in FIG. 13), the operation wire 33 is pulled upward and the one end 35a of the locking member 35 is twisted as shown in FIG. Since the coil spring 36 is pulled up against the urging force of the coil spring 36, the other end 35b of the locking member 35 is pulled down. Then, the locked state of the other end 35b of the locking member 35 and the locking groove 37a provided in the fixed plate 37 below the support shaft 32 is released, and the wheel frame 34 and the fixed plate 37 are in a free state. The wheel frame 34 can turn freely. As a result, the wheel 31 attached to the wheel frame 34 is also in an unlocked state in which the turning restriction is released.

JP 2003-54209 A

  However, in the above conventional caster, usually, the bottom part of the transport cart is attached to a total of four places, two places before and after that, but the turning of the wheel 31 attached to one place is restricted. Therefore, two caster wheels 31 mounted at the two front positions are simultaneously mounted, and two caster wheels 31 mounted at the two rear positions are mounted simultaneously, or four caster wheels mounted at two front and rear positions. At the same time, it is difficult to adopt a total lock mechanism for restricting the turning of these members, and the versatility is poor.

  Furthermore, the turning restriction mechanism attached to the conventional caster can restrict the turning of the wheel 31 or release the turning restriction. At the same time as this operation, the turning of the wheel 31 is restricted. There was a problem that the rotation regulation could not be released and the functionality was inferior.

  Further, since the turning restriction mechanism attached to the conventional caster incorporates the torsion coil spring 36 in the wheel frame 34, the total height of the caster becomes high, and when the caster is attached to the bottom of the transport cart, the total height of the transport cart is also increased. There was a problem that it became high and the transport cart became unstable.

  Therefore, the present invention aims to solve the above-mentioned conventional problems, making it easy to adopt a total lock mechanism, and restricting the turning and rotation of the wheels at the same time, and releasing the restriction of the turning and rotation at the same time. In addition, it is intended to provide a braking mechanism for casters that does not increase the overall height of the moving article even if it is attached to the bottom of a moving article such as a side table, a transport carriage, or a cabinet. is there.

  Therefore, the braking mechanism of the caster of the present invention is attached to each of the four corners of the bottom 2 of the moving article 1, and the repulsive force of the kick spring 4 is respectively applied to the operation part 3a of the lock shoe 3 of the front and rear casters C on both sides of the bottom 2. The operation portion 3a is connected to the end of the operation rod 5 so that the central portions of the operation rods 5 on both sides are pivotally supported on the bottom portion 2 of the movable article 1, respectively. The cam lever 6 is connected to the operation lever 5 on one side or both sides, and the operation lever 5 is swung by the operation of the cam lever 6 to move the lock shoe 3 of the caster C up and down. The lower peripheral end 3b of the lock shoe 3 is separated from the ground contact surface 10a of the wheel 10 of the caster C, or is contacted with the ground contact surface 10a of the wheel 10 of the caster C. It is set to be in contact with a friction force.

  And the braking mechanism of the caster of this invention is attached to each of the four corners of the bottom part 2 of the moving article 1, and the repulsive force of the kick spring 4 is respectively applied to the operation part 3a of the lock shoe 3 of the front and rear casters C on both sides of the bottom part 2. The operation portion 3a is connected to the end of the operation rod 5 so that the central portions of the operation rods 5 on both sides are pivotally supported on the bottom portion 2 of the movable article 1, respectively. It is assumed that the cam lever 6 is connected to the operating rod 5 on either side, and a pulling line 7 is stretched between the portions that become the force points at a distance from the shaft support portion, By operating the cam lever 6, the operating rods 5 on both sides are respectively swung to move the lock shoe 3 of the caster C up and down, and the lower peripheral end 3 b of the lock shoe 3 is connected to the caster 3. Or in a state away from the ground surface 10a of the C wheel 10, so that comes into contact with a frictional force to the ground surface 10a of the wheel 10 of the caster C.

Further, in the caster braking mechanism according to the present invention, the caster C fixes a cylindrical lock shoe guide 12 below a mounting plate 11 fixed to the bottom 2 of the moving article 1, and the lock shoe guide 12 a screw groove 12a provided on the outer circumference, the screw groove 3c provided on the inner periphery of said locking shoe 3 having a cylindrical shape is screwed to the lock shoe 3 so as to be moved up and down by rotated, said mounting plate 11, a main body frame 13 is pivotably attached to the main body frame 13, and the wheels 10 are rotatably attached to the main body frame 13.

  In the caster braking mechanism according to the present invention, the head 13 a of the main body frame 13 enters the lock shoe guide 12.

  Since the braking mechanism of the caster according to the present invention is configured as described above, it is easy to adopt the total locking mechanism and obtain a stable locked state of moving articles such as a side table, a transport carriage, and a cabinet. be able to.

  Furthermore, the caster braking mechanism according to the present invention is capable of regulating the turning and rotation of the wheels at the same time and canceling the regulation of the turning and rotation at the same time, and is excellent in operability and functionality.

  Further, even when the caster braking mechanism of the present invention is attached to the bottom of a moving article such as a side table, a carriage, a cabinet, etc., the total height of these moving articles does not become high, and the center of gravity becomes low and stable.

It is a perspective view of the side table which attached the caster using the braking mechanism of this invention. It is a side view of the part which attached the caster of the side table shown in FIG. It is a bottom view when the caster of the side table shown in FIG. 1 is in an unlocked state. It is a bottom view when the caster of the side table shown in FIG. 1 is in a locked state. It is an enlarged view of a portion surrounded by a circle A ₁ in FIG. It is an enlarged view of a portion surrounded by a circle B ₁ in FIG. It is an enlarged view of a portion surrounded by circle A ₂ in FIG. FIG. 5 is an enlarged view of a portion surrounded by a circle B <b> ₂ in FIG. 4. It is a half sectional view of a caster in an unlocked state by the braking mechanism of the present invention. It is a half sectional view of a caster in a locked state by the braking mechanism of the present invention. It is a disassembled perspective view of the caster used for the braking mechanism of this invention. It is a side view of the rock shoe guide of the caster shown in FIG. It is a side view which shows the state which attached the conventional caster to the bottom part of the conveyance trolley | bogie. It is sectional drawing which shows the locked state of the caster by the turning control mechanism attached to the conventional caster shown in FIG. It is sectional drawing which shows the unlocking state of the caster by the turning control mechanism attached to the conventional caster shown in FIG.

  DESCRIPTION OF EMBODIMENTS Embodiments of a caster braking mechanism according to the present invention will be described below in detail with reference to the drawings.

  The caster braking mechanism according to the present invention is used for a caster C attached to a bottom 2 of a moving article 1 such as a side table, a carriage, a cabinet or the like.

  The caster braking mechanism of the present invention shown in the figure shows an embodiment in which the moving article 1 is a side table, and is attached to each of the four corners of the bottom portion 2, and the front and rear casters C on both sides of the bottom portion 2. The operation portion 3a is connected to the end portion of the operating rod 5 with play so that the repulsive force of the kick spring 4 acts on the operation portion 3a of the lock shoe 3 respectively.

  The kick spring 4 is a torsion coil spring or the like. One end of the kick spring 4 is pivotally supported on the operation portion 3 a of the lock shoe 3, and the other end is fixed to the bottom portion 2 of the movable article 1.

  The operating rods 5 on both sides are respectively pivotally supported at their center portions on the bottom 2 of the movable article 1, and cam levers 6 are connected to the operating rods 5 on either one or both sides. It is assumed that a drawing line 7 such as a wire is stretched between locations that become a force point at a distance from each of the shaft support portions. It should be noted that the drawing line 7 may or may not be bridged between the points. In this case, in order to brake all the wheels 10 of the casters C attached to the four corners, the operation rods 5 on both sides are connected. Each cam lever 6 is connected, and each cam lever 6 needs to be operated.

  Further, it is assumed that the operating rods 5 on both sides are formed with openings 5a at both ends, respectively, and the shaft support portion of the kick spring 4 that is pivotally supported on the operation portion 3a of the lock shoe 3 enters the opening 5a and enters the opening 5a. The operation unit 3a is linked with play.

  The cam lever 6 connects the base ends of the lever 6a and the cam 6b at a certain angle, and supports the base ends of the lever 6a on the bottom 2 of the movable article 1, The rotating end is projected outward from the bottom 2 of the moving article 1.

  The cam 6b of the cam lever 6 has a ball bearing 8 attached to the rotating end thereof, and the ball bearing 8 moves along the guide hole 5b formed in the length direction of the operating rod 5 by operating the cam lever 6. The operation rod 4 is swung.

  Then, by operating the cam lever 6, the operating rods 5 on both sides are respectively swung, and the lock shoe 3 of the caster C is rotated to move up and down, as shown in FIGS. The lower peripheral end 3b of the lock shoe 3 is separated from the ground contact surface 10a of the wheel 10 of the caster C, or the repulsive force of the kick spring 4 is received as shown in FIGS. The wheels 10 of the casters C are in contact with the ground contact surface 10a with frictional force.

  The caster C fixes a cylindrical lock shoe guide 12 below a mounting plate 11 fixed to the bottom 2 of the moving article 1, and is cylindrical in a thread groove 12 a provided on the outer periphery of the lock shoe guide 12. The thread groove 3c provided on the inner periphery of the lock shoe 3 is screwed together.

  Further, the caster C is configured such that the main body frame 13 is pivotally attached so that the head 13a of the main body frame 13 enters the lock shoe guide 12 below the mounting plate 11. It is assumed that the wheel 10 is rotatably attached to the foot 13b of the frame 13.

  The mounting plate 11 has a substantially circular shape, and is provided with screw holes 14 in projecting portions 11a projecting outward at intervals of 120 ° or 180 °, and retaining holes 15 at inward intervals of 120 °. The screw holes 14 are respectively inserted into the screw holes 14 and fixed to the bottom portion 2 of the moving article 1 by screws.

  The lock shoe guide 12 is made of a light metal such as an aluminum alloy or a hard synthetic resin, and has a flat cylindrical shape. Protrusions 17 are provided at three intervals on the upper surface at intervals of 120 °. The plate 11 is fixed to the mounting plate 11 by being fitted into the stop holes 15 of the plate 11, respectively.

  The lock shoe 3 is made of a light metal such as an aluminum alloy or a hard synthetic resin and has a flat cylindrical shape. The operation portion 3a is provided on an outer peripheral portion of the lock shoe 3. The kick spring 4 is provided on the operation portion 3a. One end of the shaft is pivotally supported. Further, the lower peripheral end 3b of the lock shoe 3 is formed in a concavo-convex shape or is provided with a soft synthetic resin, rubber, or the like as a single body or a separate body so as to easily contact the ground contact surface 10a of the wheel 10 with frictional force. Can be.

  The operating rod 5 is made of a long metal plate, a metal rod, or the like. When the lock shoe 3 is raised, it is opposed to the repulsive force of the kick spring 4 and the lock shoe 3 is lowered. Is configured to receive the repulsive force of the kick spring 4 and to rotate the lock shoe 3 at a rotation angle of 30 to 90 °.

  The body frame 13 is pivotally attached to the lower side of the mounting plate 11 via a ball bearing 18, and a support shaft hole 19 is provided at the lower end of the foot portion 13 b, and penetrates the support shaft hole 19. The wheel 10 is pivotally supported on the axle 20. And by making this main body frame 13 incline in one direction, it is set as the structure (one-way clutch) in which the wheel 10 rotates only in one direction.

  As shown in FIG. 3, the caster braking mechanism of the present invention configured as described above has a lower peripheral end 3b of the lock shoe 3 as shown in FIG. The wheel 10 of the caster C is in an unlocked state in which turning and rotation are not restricted.

  Therefore, when the cam lever 6 is operated from the state shown in FIG. 3 to the state shown in FIG. 4, the lock shoe 3 rotates and descends. That is, when the cam lever 6 is operated, the ball bearing 8 attached to the rotating end of the cam 6b moves along the guide hole 5b of the operating rod 5, and the operating rod 5 on the cam lever 6 side swings. The pulling line 7 is drawn by the swinging of the hook 5, and the operation lever 5 on the other side of the cam lever 6 is also simultaneously swinging. By the swinging of the operation lever 5, the casters C at the four corners of the bottom 2 of the moving article 1 are moved. The lock shoes 3 are simultaneously rotated, and the respective lock shoes 3 are lowered to be in the state shown in FIG. 10. Under the repulsive force of the kick spring 4, the lower peripheral ends 3 b of the respective lock shoes 3 are respectively The wheels 10 of the wheels 10 of the four corners are in a locked state in which turning and rotation are restricted at the same time. In this case, since the lock shoes 3 of the casters C at the four corners receive the repulsive force of the kick springs 4, a stable braking force can be obtained at the wheels 10 of the casters C.

  In addition, when it is not assumed that the drawing wire 7 is bridged between the operation rods 5 on both sides, when the cam lever 6 is operated, only the operation rod 5 on the cam lever 6 side is swung, and the movable article 1 is moved. The lock shoes 3 of the casters C at the two corners of the bottom portion 2 are simultaneously rotated, the respective lock shoes 3 are lowered, and the repulsive force of the kick spring 4 is received. The wheels 10 of the casters C at the two corners are simultaneously brought into a locked state in which turning and rotation are restricted.

  Further, when the operating rod 5 is returned to the original state from the state shown in FIGS. 4 and 10, the lock shoe 3 is rotated to the original state and raised to the state shown in FIGS. 3 and 9 again. The lower peripheral end 3b of the lock shoe 3 is separated from the ground contact surface 10a of the wheel 10, and the wheel 10 of the caster C is in an unlocked state in which turning and rotation are not restricted.

  As described above, the caster braking mechanism of the present invention simultaneously locks and unlocks the wheels 10 of the casters C attached to the four or two corners of the bottom 2 of the moving article 1 with a simple operation. Therefore, the total lock mechanism can be easily adopted and a stable locked state can be obtained.

  Furthermore, the caster braking mechanism according to the present invention is capable of regulating the turning and rotation of the wheel 10 at the same time and canceling the restriction of the turning and rotation at the same time, and is excellent in operability and functionality. .

  Further, the caster braking mechanism of the present invention is such that the head 13a of the main body frame 13 enters the lock shoe guide 12, and the kick spring 4 is not housed in the main body frame 13, so that the total height of the caster C is increased. Even if it is attached to the bottom 2 of the moving article 1, the overall height of the moving article 1 is not increased, and the center of gravity of the moving article 1 is lowered and stabilized.

DESCRIPTION OF SYMBOLS 1 Moving article 2 Bottom part 3 Lock shoe 3a Operation part 3b Lower peripheral end 3c Screw groove 4 Kick spring 5 Operation rod 6 Cam lever 7 Drawing line 10 Wheel 10a Grounding surface 11 Mounting plate 12 Lock shoe guide 12a Screw groove 13 Main body frame 13a Head C caster

Claims (4)

  The kick springs (4) are respectively attached to the operation parts (3a) of the lock shoes (3) of the front and rear casters (C) on both sides of the bottom (2), respectively, at the four corners of the bottom (2) of the moving article (1). The operating part (3a) is connected to the end of the operating rod (5) so that the repulsive force acts, and the central parts of the operating rods (5) on both sides are connected to the movable article (1). ) Is pivotably supported by the bottom part (2) of each of them, and a cam lever (6) is connected to one or both of the operation rods (5). By operating the cam lever (6), The lock rod (3) of the caster (C) is moved up and down by swinging the operating rod (5), and the lower peripheral end (3b) of the lock shoe (3) is the wheel (10) of the caster (C). ) Away from the ground plane (10a) Or, wherein the casters (C) of the wheel (10) caster braking mechanism, characterized in that set to be in contact with a frictional force to the ground plane (10a) of.   The kick springs (4) are respectively attached to the operation parts (3a) of the lock shoes (3) of the front and rear casters (C) on both sides of the bottom (2), respectively, at the four corners of the bottom (2) of the moving article (1). The operating part (3a) is connected to the end of the operating rod (5) so that the repulsive force acts, and the central parts of the operating rods (5) on both sides are connected to the movable article (1). ) Are pivotally supported by the bottom (2) of each of them, and the cam lever (6) is connected to either one of the operation rods (5). The pulling line (7) is stretched between the points to be, and the operation levers (5) on both sides are swung by the operation of the cam lever (6), so that the lock shoe of the caster (C) (3) is moved up and down to lock -The lower peripheral end (3b) of (3) is separated from the ground contact surface (10a) of the wheel (10) of the caster (C), or the ground contact surface of the wheel (10) of the caster (C). A braking mechanism for a caster, characterized in that the state is brought into contact with (10a) with a frictional force.   The caster (C) fixes a cylindrical lock shoe guide (12) below a mounting plate (11) fixed to the bottom (2) of the moving article (1), and the lock shoe guide (12). The screw groove (3c) provided on the inner periphery of the cylindrical lock shoe (3) is screwed into the screw groove (12a) provided on the outer periphery of the lock shoe, and the lock shoe (3) is rotated. The body frame (13) is pivotably mounted below the mounting plate (11), and the wheel (10) is rotatably mounted on the body frame (13). The caster braking mechanism according to claim 1 or 2, characterized in that: 4. The caster braking mechanism according to claim 3, wherein the head (13a) of the main body frame (13) enters the lock shoe guide (12).

Images