JP4460438B2 - Caster with double lock mechanism - Google Patents

Description

  The present invention relates to a caster having a mechanism for simultaneously locking the rotation of a wheel and a turning operation in a horizontal direction.

  Generally, a caster is composed of an attachment member 16, a base material 2, a shaft 3, a wheel 1, and an axle 4, and the shaft 3 is mounted on the attachment member 16 in the vertical direction. Is held so as to turn in the horizontal direction. Further, an axle 4 is provided on the base material 2, and the wheel 1 rotates with respect to the axle 4 and travels. The axle 4 is arranged at an eccentric position deviated from the flange shaft 3 by a certain distance, and by this eccentricity, the operation of turning simultaneously while the wheel 1 rotates can be smoothly performed. In addition, the ordinary caster is mounted on the bottom of the mounted body 21 such as a wagon or furniture that is moved relatively frequently. If the bottom is rectangular, the caster is almost always disposed at each corner. At this time, since the wheel 1 turns eccentrically at the position of the saddle shaft 3, it is constant from the outer periphery of the bottom surface so that the wheel 1 does not protrude excessively from the outer peripheral side surface of the mounted body 21 in any state during the turning operation. It is necessary to set with the distance inside.

  Next, in the mounted body 21 to which the caster is attached, there are many things such as a moving shelf such as a wagon, office equipment such as a copy machine, and a carriage used in a hospital. In order to get on and off, a shape that is relatively long and has a small bottom area is advantageous. Furthermore, if a large amount is to be transported at one time, it is necessary to secure the capacity of the entire mounted body 21, and the mounted body 21 inevitably tends to be tall. Here, the stability of the mounted body 21 is better as the distance between the contact surfaces of the wheels 1 of each caster is larger. However, this distance naturally changes due to the turning operation.

  In addition, the caster is equipped with a lock device that is also equipped with a lock device and without a lock device. With the lock device, a wheel lock pin 9 that is interlocked with the lock lever 5 by raising and lowering the lock lever 5 up and down. Is often used to engage the engaging teeth 10 on the inner surface of the wheel 1 to stop the rotation of the wheel 1. The role of the locking device is to prevent the mounted body 21 from moving due to the inclination of the floor surface or an unexpected collision operation with respect to the mounted body 21 in a stopped state, and by locking the wheel 1, the mounted body. It is possible to prevent the movement of the traveling 21. Normally, the position of the lock lever 5 is arranged in the direction opposite to the collar shaft 3 with the axle 4 in between. The lock lever 5 is directed toward the outer periphery of the mounted body 21 for locking operation with hands or feet. Need to be. Therefore, in a caster with a locking device, the grounding point of the wheel 1 is often disposed relatively outward immediately after the locking operation is performed.

  However, the above-described locking device that only stops the rotation of the wheel 1 cannot stop the turning operation at the locked position. This turning operation pushes and pulls the mounted body 21 from the state in which the wheel 1 is locked. Then it happens easily. Then, the very unstable situation where the grounding point of the wheel 1 of the caster is arranged on the back side with respect to the bottom of the mounted body 21 occurs. As a result, it has become a problem that it easily falls down due to sudden collision or shaking caused by an earthquake. Therefore, a double lock mechanism that stops the turning operation simultaneously with the lock operation by the lock lever 5 is effective, and many reports have been reported in Japanese Patent No. 2937824.

  Here, FIG. 13 shows various states when a caster with a double lock mechanism capable of simultaneously locking the rotation operation and the turning operation of the conventional wheel 1 is mounted on the mounted body 21 having the rectangular bottom surface such as the most general cart. This will be described with reference to FIG. Normally, there are four casters attached to the mounted body 21, and only two on the near side are generally set with a locking device. Further, the saddle shaft 3 is shown at the same position in FIGS. 13 to 16, and each caster rotates 360 degrees around the saddle shaft 3. Therefore, the direction of the casters without the two locking devices on the far side is in an irregular state. Then, the orientation of the two front wheels 1 having the locking device is important for the stability of the mounted body 21, and the state of the mounted body 21 shown in FIG. It becomes the arrangement | positioning which the mounting body 21 stabilizes and cannot fall easily. Therefore, the direction of the wheel 1 shown in FIG.

However, in the conventional mechanism that simultaneously locks the rotation and turning of the wheel 1, the hand and the foot can reach any position as long as the lock lever 5 protrudes from the outer peripheral position of the mounted body 21 even slightly. The locking operation can be performed within an angle range of about 150 degrees. Then, the turning of the wheel 1 may be locked in the direction along the longitudinal direction of the rectangular bottom surface as shown in FIG. 15 or in the position rotated further to the far side in the short side direction shown in FIG. In the case of FIG. 16 and the like, the wheel is locked in a very unstable state, and the mounted body 21 is in a state of being easily tilted to the near side. Further, in a caster having a large wheel 1 diameter, the gap between the bottom surface and the floor surface of the mounted body 21 is wide, and it is possible to forcibly perform a locking operation by putting a foot or a hand into the gap. Therefore, it is conceivable that the lock operation is performed in a state where the ground contact point of the wheel 1 is located farther away than in FIG. However, in Japanese Patent No. 2937824 and the like, only a mechanism for simultaneously locking the rotation operation and the turning operation of the wheel 1 is reported, and there is no restriction on the direction of the wheel 1 when the turning operation is locked.
Japanese Patent No. 2937824

  Therefore, it has a configuration in which the rotation operation and turning operation of the wheel are simultaneously locked by the operation of lowering the lock lever, and it is the reference position or reference position that is outward in the lateral direction of the most stable rectangular attached body. The caster can be locked only within a predetermined angle range centered on the wheel, and if it is within a certain angle range centered on the reference position, the wheel direction is forced to the reference position by locking operation. The object is to propose a caster with a double lock mechanism which also has a mechanism for automatically guiding.

  First, an attachment member, a base material, a shaft, a wheel, and an axle are provided, the shaft is attached to the attachment member in the vertical direction, the base material is attached to the shaft so as to be pivotable in the horizontal direction, and the axle is attached to the base material. The caster is constructed by mounting it at an eccentric position deviating from the shaft by a certain distance and assembling the wheel on the axle for rotation. Next, it had an operation part on one side of the axis for the lock lever, a lock lever having a drive part on the other side, a transmission member having a plurality of inclined surfaces, and a similar inclined surface and convex portion. A turning prevention member is provided. A horizontal guide groove and a vertical guide groove continuous therewith are formed on the opposite side of the shaft between the axle inside the base material.

Next, the turning prevention member is inserted into the vertical guide groove in such a manner that the convex portion is directed upward, the transmission member and the spring member are inserted into the horizontal guide groove, and the transmission member is biased toward the drive portion by the spring member . Further, the lock lever is rotatably incorporated into the base material via the lock lever shaft center in a state where the operation portion protrudes from the base material and the drive portion contacts the transmission member in the base material. At this time, the drive portion is in contact with one inclined surface of the transmission member, and the other inclined surface is arranged so as to face the inclined surface of the turning prevention member, and the drive portion is rotated by pushing down the operation portion of the lock lever. And the convex portion of the rotation preventing member is configured to protrude upward from the base material in conjunction with the inclined surface of the transmission member. Also, a circular engagement tooth is provided on the inner surface of the wheel, and a wheel lock pin is provided on the drive portion of the lock lever or on the turning prevention member, and the wheel lock pin is attached to the engagement tooth inside the wheel by lowering the lock lever. It is configured to be fitted to lock the rotation of the wheel.

Next, a regulating member having a recess is mounted on the mounting member, and the mounting member is completely fixed to the mounted body. The direction of the concave portion of the restricting member at this time is important, and the mounting member is fixed to the mounted body so that the concave portion is arranged in the outer peripheral direction of the narrow side with the bottom shape of the mounted body. That is, if the bottom surface of the mounted body is rectangular, the concave portion is set on the front side of the longer side. And the shape of this recessed part is made the same as the shape of the convex part at the front-end | tip of a rotation prevention member, and only the magnitude | size is enlarged only slightly.

  By configuring as described above, the drive portion pushes the transmission member in the horizontal direction by pushing down the operation portion of the lock lever downward, and the turning prevention member moves upward by both inclined surfaces of the transmission member and the turning prevention member. It becomes the operation that As a result, when the concave portion of the restricting member and the convex portion of the turning prevention member are aligned, that is, when the wheel is at the reference position, the convex portion at the tip of the turning preventing member is inserted into the concave portion of the restricting member, It becomes possible to lock the movement of the substrate.

  Therefore, in the above-described configuration, it is necessary to align the position of the convex portion of the turning prevention member with the position of the concave portion of the restricting member at the stage of the locking operation. It is the reference position. Moreover, when the position of the convex part of a rotation prevention member and the recessed part of a control member has shifted | deviated extremely in the stage which is going to implement locking operation, since both are not inserted, it cannot lock. Therefore, the lock operation is performed again after the positions of the two are matched, and the risk of locking the caster in an unstable position can be eliminated and the reliability can be further increased.

  However, it is troublesome to match the concave portion of the regulating member and the convex portion of the turning prevention member each time. Therefore, as a first means to solve this problem, the shape of the convex portion of the turning prevention member is formed in a tapered mountain shape, and the shape of the concave portion of the regulating member is formed in a mountain shape that extends downward. Then, the inclined portions of both mountain shapes become the guide surface, and when the concave and convex portions are slightly shifted, the guide operation by the guide surfaces of the two mountain shaped portions is performed, and the caster is locked while turning to the reference position. It becomes possible. The range of this automatic guidance can be set by the degree of opening of the angled portions of both chevron shapes, and if this degree of opening is made symmetrical from the reference position, the direction of the wheel is within a predetermined angular range centered on the reference position. In this case, the turning operation can be locked while forcibly moving the direction of the wheel to the reference position.

As a next means, the concave portion of the restricting member is formed in a fan shape having a predetermined opening angle around the saddle shaft, and a fine uneven portion is provided on the back surface of the concave portion. And a fine uneven part is formed also in the front-end | tip surface of the convex part of a rotation prevention member. Then, only when the direction of the wheel is within a predetermined angle range centered on the reference position, it becomes possible to insert the convex portion of the turning prevention member into the concave portion of the restriction member. The turning operation of the wheel can be locked by engaging the concave and convex portions of both at the stage. Further, when the direction of the wheel is extremely deviated from the predetermined angle range, the turning prevention member is not inserted into the recess and cannot be locked, so that the stability of the mounted body is ensured.

  It has a structure that can lock the rotation and turning of the wheel at the same time, and has a mechanism that fits the concave part of the restricting member and the convex part of the turning prevention member, and locks the wheel at the reference position where the mounted body is most stable. Since the structure which adds is added, stability of a to-be-mounted body can be improved. In addition, if the wheel turns more than a predetermined angle range from the reference position and the concave part of the restricting member and the convex part of the turning prevention member deviate, it cannot be locked. Can also be eliminated.

  If the shape of the convex portion of the turning prevention member is formed in a tapered mountain shape, and the shape of the concave portion of the restriction member is formed in a mountain shape that spreads downward, the upward movement of the turning prevention member by the locking operation By the moving operation, a guide operation is performed between the two mountain-shaped portions, and the caster can be locked while turning to the reference position.

  If the concave part of the restricting member is formed in a fan shape, a fine uneven part is provided on the back surface of the concave part, and a fine uneven part is also formed on the leading end face of the turning prevention member, the direction of the wheel is the reference. If it is within a predetermined angle range centered on the position, the turning prevention member can be inserted into the recess of the restricting member. Then, at the final stage of the upward movement of the turning prevention member, the concave and convex portions of both engage with each other, so that the turning operation of the wheel can be locked at that position. In other words, the lockable angle of the wheel can be set within a predetermined range in which the mounted body is relatively stable.

  An embodiment of a caster with a double lock mechanism of the present invention will be described below. FIG. 1 is an assembled side view of the caster of the present invention, and FIG. 2 is an assembled front view. As shown in FIG. 1, the caster of the present invention has the same basic structure as that of the conventional one, and has a mounting member 16, a base member 2, a shaft 3, a wheel 1, and an axle 4 that are fixed to a mounted body 21. The shaft 3 is mounted on the mounting member 16 in the vertical direction, and the base material 2 is held so as to pivot in the horizontal direction with respect to the shaft 3, and the axle 4 is attached to the base material 2 from the shaft 3. The wheel 1 is mounted at an eccentric position that is deviated by a certain distance, and the wheel 1 is rotatably assembled to the axle 4. Further, the mechanism for locking the rotation of the wheel 1 may be the same as the conventional one, and a lock lever 5 having an operation portion 7 and a drive portion 6 on the opposite side of the shaft 3 across the axle 4 of the base material 2 is used for the lock lever. The wheel lock pin 9 is rotatably mounted on the shaft center 8, the wheel lock pin 9 is provided in the drive portion 6, and the wheel lock pin 9 is fitted to the engagement tooth 10 inside the wheel 1 by the operation of lowering the lock lever 5. The configuration for locking the rotation operation of the wheel 1 is simple.

  Here, in the caster with a double lock mechanism according to the present invention, as shown in FIG. 3, the lock lever 5 having the shape having the operation portion 7 and the drive portion 6 is provided on both sides of the lock lever shaft center 8 as a boundary. 6 is formed with a curved surface, and the wheel lock pin 9 is inserted into the drive portion 6 and assembled. The drive portion 6 is mounted on the base material 2 in such a manner that the drive portion 6 is disposed in the base material 2 and the operation portion 7 protrudes from the base material 2 and is pivotable in the vertical direction about the lock lever axis 8. Further, a transmission member 11 having inclined surfaces 12 at both ends, and a turning prevention member 13 having similar inclined surfaces 12 and convex portions 14 are provided. A horizontal guide groove and a vertical guide groove continuous therewith are formed on the opposite side of the shaft 3 between the axle 4 inside the base material 2.

FIG. 4 is a side view of the transmission member 11, which is prismatic and has inclined surfaces 12 at both ends. FIG. 5 is a side view of the turning prevention member 13. Similarly, a prismatic shape is provided with an inclined surface 12 on the lower side, and a protruding convex portion 14 is formed on the upper portion. Then, as shown in FIG. 1, the rotation preventing member 13 is inserted into the vertical guide groove provided in the base material 2 so that the convex portion 14 is directed upward, and the transmission member 11 is inserted into the horizontal guide groove. It arrange | positions in the state where the inclined surfaces 12 face each other. At this time, the other inclined surface 12 of the transmission member 11 is set so as to be in contact with the curved surface of the drive portion 6 of the lock lever 5, and a spring member 15 is further inserted into the horizontal guide groove so that the transmission member 11 is moved to the drive portion 6 side. Energize .

  FIG. 6 is a schematic view showing a mechanism in which the turning prevention member 13 moves upward in conjunction with the downward lock operation of the lock lever 5, and FIG. 6 (a) shows the state before the lock operation. FIG. 6B shows a state after the lock operation is completed. When the operation portion 7 of the lock lever 5 is pushed down from the state of FIG. 6A, the curved surface at the end of the drive portion 6 rotates, the inclined surface 12 is pressed, the spring member 15 is compressed, and the transmission member 11 is moved horizontally. Moving. As a result, the turning prevention member 13 is moved upward by the inclined surfaces 12 of the turning prevention member 13 and the transmission member 11 that are in contact with each other. Further, if a continuous circular engagement tooth 10 is provided on the inner surface of the wheel 1, the drive portion 6 is rotated by the operation at the time of locking, and the wheel lock pin 9 is engaged with the engagement tooth 10, and at the same time The rotation of the wheel 1 can be stopped.

  In the unlocking operation, when the operation portion 7 is lifted, the curved surface of the drive portion 6 is separated from the inclined surface 12 of the transmission member 11, and the transmission member 11 is returned and moved in the horizontal direction by the force of the spring member 15. At this time, if the rotation preventing member 13 and the transmission member 11 are merely in contact with the inclined surface 12, the rotation preventing member 13 is not returned downward by the force of the spring member 15 in the releasing operation. It will be released by the dropping action due to its own weight. Therefore, if the two are connected to each other by not only the inclined surface 12 but also the inclined groove or the inclined hole, the turning prevention member 13 is lowered in conjunction with the movement of the transmission member 11 by the spring member 15 at the time of release. And a more reliable release operation can be obtained.

Next, as shown in FIG. 1, a regulating member 17 having a recess 18 is provided, and is fixed to the mounting member 16 in an arrangement in which the inner surface of the recess 18 faces downward, and the mounting member 16 is completely attached to the mounted body 21. Fix it. At this time, the periphery of the recess 18 of the regulating member 17 is formed in a planar shape that is flush with the lowermost side surface of the recess 18. Further, the position of the surface around the concave portion 18 is set so as to be slightly higher than the position of the tip end of the convex portion 14 of the turning prevention member 13 in the unlocked state. Then, the convex portion 14 is inserted into the concave portion 18 of the restricting member 17 by the upward movement operation of the turning prevention member 13 by the locking operation, and the turning operation of the wheel 1 can be locked. Further, the position and direction of the concave portion 18 of the regulating member 17 with respect to the mounted body 21 are important at this time, and the concave portion 18 is arranged in the outer peripheral direction of the narrow side in the shape of the bottom surface of the mounted body 21. The attachment member 16 is fixed to the mounted body 21. That is, the wheel 1 is preferably set so as to be arranged at the reference position described above, which is the outer peripheral direction of the narrow side in the locked state.

  Here, the convex portion 14 is inserted into the concave portion 18 of the restricting member 17 by the upward movement operation of the turning prevention member 13, and there are various configurations in the means for locking the turning operation of the wheel 1 and the shapes of the convex portion and the concave portion. 7 and FIG. 8 will be described as the first embodiment of the first configuration. In the first embodiment, the shape of the convex portion 14 at the tip of the turning prevention member 13 is a shape like a cylinder or a prism, and the shape of the concave portion 18 of the regulating member 17 is set to be substantially the same, and only the size is slightly increased. Keep it. FIG. 7 shows the position and orientation of each caster with respect to the mounted body 21. If the bottom surface of the mounted body 21 is rectangular, the casters of the first embodiment are mounted on the left and right sides of the longer side. Therefore, the recess 18 of the regulating member 17 is also arranged on the near side of the mounted body 21. Further, the two rear sides may be casters without a lock, and are shown in a state in which they can freely turn in FIG.

  FIG. 8 is a schematic diagram showing a fitting state of the concave portion 18 of the regulating member 17 and the convex portion 14 of the turning prevention member 13 according to the turning position of the wheel 1 in the first embodiment. At the reference position shown on the right side in FIG. 7 where the wheel 1 is facing straight forward, the concave portion 18 of the restricting member 17 and the convex portion 14 of the turning preventing member 13 are in the state shown in FIG. If the locking operation is performed as it is, the convex portion 14 of the turning prevention member 13 can be inserted into the concave portion 18 of the regulating member 17 as shown in FIG. 8B, and the turning operation can be locked. However, when the wheel 1 is slightly turning as shown in the left side of FIG. 7, the protrusion 14 of the turning prevention member 13 and the restricting member 17 of the turning prevention member 13 are set even though the lock lever 5 is in an operable position. Since the position of the concave portion 18 is shifted, even if the locking operation is performed, the convex portion 14 of the turning prevention member 13 hits the lower surface of the regulating member 17 as shown in FIG. Therefore, in this case, it is necessary to perform the locking operation again after aligning the positions of the two. That is, in the configuration of the first embodiment, it is necessary to align the position of the convex portion 14 of the turning prevention member 13 with the position of the concave portion 18 of the restricting member 17 at the stage of the locking operation. In addition, the wheel 1 is arranged at a reference position where the mounted body 21 is most stable and hardly falls.

  However, it is troublesome to adjust the concave portion 18 of the regulating member 17 and the convex portion 14 of the turning prevention member 13 each time, and it is assumed that this fine adjustment is difficult when the mounted body 21 is heavy. Here, in general, the mounted body 21 is often provided with a handle or a grip for traveling, and naturally the direction of pressing with the hand is determined, and a normal locking device is provided on the front side of the pressing side. Casters are arranged. Therefore, it is considered that there is a high probability that the wheel 1 is in a direction close to the reference position to some extent when the mounted body 21 is normally pushed, moved and stopped as it is.

  Therefore, when the concave portion 18 of the restricting member 17 and the convex portion 14 of the turning prevention member 13 are largely deviated, the lock operation is performed only when the direction of the caster is deviated from the reference position by a predetermined angle range. At the same time, it is considered to be very effective if the direction of the caster can be forcibly guided to the reference position. A configuration having such means will be described with reference to FIGS. 9 and 10 as a second embodiment. FIG. 9 shows a state in which the casters in the second embodiment are mounted on the right and left sides of the mounted body 21 as in FIG. FIG. 10 is a schematic diagram showing a fitting state of the concave portion 18 of the regulating member 17 and the convex portion 14 of the turning prevention member 13 according to the turning position of the wheel 1 in the second embodiment. In the second embodiment, the shape of the convex portion 14 of the turning prevention member 13 is formed by a tapered mountain shape having inclined guide surfaces 19 on both side surfaces, and the shape of the concave portion 18 of the regulating member 17 is defined by the shaft 3. It is formed in a fan shape with a center and a mountain shape with a guide surface 19 extending downward.

  Then, the reference position is in the state shown in FIG. 10A, and if the lock operation is performed as it is, it can be locked as shown in FIG. 10B. Further, even when the concave portion 18 and the convex portion 14 are deviated within a predetermined angle range as shown in the left side of FIG. 9, in the configuration of the second embodiment, the upward movement operation of the turning prevention member 13 by the lock operation is performed. Thus, as shown in FIG. 10 (c), both guide surfaces 19 come into contact with each other, so that the automatic guide operation is performed, and the wheel 1 is turned to the reference position shown in FIG. 10 (b) through the state shown in FIG. 10 (d). It becomes possible to lock while. However, if the position is extremely shifted as shown in the right side of FIG. 9, the position between the guide surfaces 19 is changed as shown in FIG. 10 (e) regardless of the position where the lock lever 5 can be operated as in the first embodiment. The tip portion contacts the lower surface of the regulating member 17 and cannot be locked. Therefore, an erroneous operation that locks at an unstable caster position as in the first embodiment can be eliminated.

  The angle range of this automatic guidance can be set by the degree of opening of the both guide surfaces 19, that is, the angle and distance of the inclined guide surface 19, and if this degree of opening is symmetrical about the reference position, the wheel 1 When the direction is within a predetermined angle range centered on the reference position, the turning operation can be prevented while forcibly moving the direction of the wheel 1 to the reference position. Accordingly, in the case where the mounted body 21 is normally run and locked after being stopped, there is a high probability of entering the range in which automatic guidance is possible, and the labor for realigning both positions in the first embodiment can be reduced. . However, in the second embodiment, when the weight of the mounted body 21 is large, a problem remains that the operation is relatively heavy when the lock operation is performed with the toes, and the operation is still performed with the hand.

  Another configuration will be described with reference to FIGS. 11 and 12 as a third embodiment. FIG. 11 also shows the same arrangement as in FIG. 7, and shows a state in which the casters of the third embodiment are mounted in front of the mounted body 21. Here, considering the stability of the mounted body 21, it is best that the wheel 1 is directed to the reference position as described above. However, in the slight turn around the front left in FIG. The grounding point has hardly moved and has no significant effect. Therefore, in the third embodiment, the convex portion 14 of the turning prevention member 13 can be inserted into the concave portion 18 of the regulating member 17 as it is within a predetermined angle range from the reference position that does not significantly affect the stability of the mounted body 21. It is possible to lock the turning operation at that position, and the lock operation at that time does not become the guide operation as in the second embodiment, and therefore, the operation does not become heavy. To do.

  In the third embodiment, as shown in FIG. 11, the convex portion 14 of the turning prevention member 13 is formed in a substantially fan-shaped prismatic shape having a small opening angle, and the concave portion 18 of the regulating member 17 is formed as a convex portion of the turning prevention member 13. It is formed in a substantially sector shape having a much larger opening angle with respect to the portion 14. Then, the convex portion 14 of the turning prevention member 13 can be inserted at any position within the range. However, in the state as it is, the turning prevention member 13 and the wheel 1 including the convex portion 14 move in the concave portion 18. Therefore, as shown in FIG. 12, a fine concavo-convex portion 20 is provided on the tip surface of the convex portion 14, and similarly, a concavo-convex portion 20 is also provided on the back surface of the concave portion 18 so that both concavo-convex portions 20 are fitted. deep. Any shape may be used for this fitting, but the tip of the concavo-convex portion 20 may be formed at an acute angle or a curved surface so that the concavo-convex portions 20 can be easily fitted.

  Then, when the wheel 1 shown in FIG. 12 (a) is at the reference position, the convex portion 14 of the turning prevention member 13 is directly inserted into the concave portion 18 of the restricting member 17 by the locking operation, and at the final stage of its upward movement, FIG. As shown in (b), the concave and convex portions 20 of both are fitted to hold the position. Further, even when the wheel 1 is slightly turned from the reference position, as long as the convex portion 14 of the turning prevention member 13 can be inserted into the concave portion 18 of the restricting member 17, as in FIG. The uneven portion 20 is fitted, and the turning operation of the wheel 1 can be locked at the position. However, when the wheel 1 is largely deviated from the reference position, the convex portion 14 cannot be inserted into the concave portion 18 as shown in FIG. Therefore, it is preferable that the substantially fan-shaped opening angle of the concave portion 18 is set so that the locking operation can be performed only in a range where the stability of the mounted body 21 is not extremely deteriorated.

It is an assembly side view of the caster of the present invention. It is an assembly front view of the caster of the present invention. It is a side view of the lock lever of the caster of this invention. It is a side view of the transmission member of the caster of the present invention. It is a side view of the rotation prevention member of the caster of this invention. It is a side surface schematic diagram of the structure which prevents turning of the caster of this invention. It is a top view of the state which mounted | wore the near side of the to-be-mounted body with the caster of 1st embodiment of this invention. It is a schematic diagram which shows the lock operation state by the turning position of the caster of 1st embodiment of this invention. It is a top view of the state which mounted | wore the near side of the to-be-mounted body with the caster of 2nd embodiment of this invention. It is a schematic diagram which shows the lock operation state by the turning position of the caster of 2nd embodiment of this invention. It is a top view of the state which mounted | wore the near side of the to-be-mounted body with the caster of 3rd embodiment of this invention. It is a schematic diagram which shows the lock operation state by the turning position of the caster of 3rd embodiment of this invention. It is an arrangement | positioning figure which shows the position of the wheel where a to-be-mounted body is most stable in the caster which can lock the conventional turning operation | movement. It is an arrangement | positioning figure which shows the range which can be locked in the caster which can lock the conventional turning operation | movement. It is a layout in the state where the wheel turned to the longitudinal direction of a to-be-mounted body in the caster which can lock the conventional turning operation. It is a layout view showing a wheel position where a mounted body is most unstable in a range in which a lock lever can be operated in a conventional caster capable of locking a turning operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel 2 Base material 3 Shaft 4 Axle 5 Lock lever 6 Drive part 7 Operation part 8 Lock lever shaft 9 Wheel lock pin 10 Engagement tooth 11 Transmission member 12 Inclined surface 13 Turning prevention member 14 Convex part 15 Spring member 16 Attachment member 17 Restriction member 18 Concave portion 19 Guide surface 20 Concavity and convexity portion 21 Mounted object

Claims (4)

A caster configured to simultaneously lock the rotation operation of the wheel and the turning operation with respect to the shaft by the operation of the lock lever, and the concave member is disposed in the predetermined outer peripheral direction of the mounted body by the mounting member. The lock lever, the transmission member, and the turning prevention member having a protrusion at the tip are incorporated into the base, and the lock lever or the wheel lock pin provided on the turning prevention member is moved to the wheel by lowering the lock lever. A configuration in which the rotation operation of the wheel is locked by being fitted to an internal engagement tooth, and a convex portion of the turning prevention member positioned below the concave portion of the restricting member is inserted into the concave portion of the restricting member via the transmission member. while locking the pivoting operation about the axis, can the operation convex portion of the pivot blocking member located other than below the recess of the regulating member lowers the lock lever in contact with the lower surface of the regulating member Double lock mechanism casters, characterized in that a configuration and you odd. A caster that is configured to simultaneously lock the rotation of the wheel and the turning operation with respect to the shaft by operating the lock lever, and fixing the regulating member having a recess so that the recess is arranged in a predetermined outer peripheral direction of the mounted body. Then, the lock lever, the transmission member, and the turning prevention member having a protrusion at the tip are incorporated in the base material, and the lock lever or the wheel lock pin provided on the turning prevention member is engaged inside the wheel by lowering the lock lever. A configuration in which the rotation operation of the wheel is locked by being fitted to a tooth, and a configuration in which the convex portion of the turning prevention member is inserted into the concave portion of the restriction member via the transmission member to lock the turning operation around the shaft. Provided,
In the configuration for locking the turning operation, the lock lever has an operation portion and a drive portion with the lock lever shaft centered therebetween, and is rotatably mounted on the base material by the lock lever shaft center. Is limited to be movable in the base material only in the horizontal direction in a shape having a plurality of inclined surfaces, and the rotation preventing member having the inclined surface is arranged in the base material in an arrangement facing the inclined surface of the transmission member. A spring member that urges the transmission member to the drive part side of the lock lever is inserted into the base material so as to be movable only in the vertical direction, and the drive part springs the transmission member by operating the lock lever downward. The structure is characterized in that the member is pushed in the horizontal direction while being compressed, the rotation preventing member is moved upward by the inclined surfaces, and the protrusion at the tip of the rotation preventing member is inserted into the recess of the restricting member. Cass with double lock mechanism Over. The concave portion of the restricting member is formed in a chevron shape that extends downward, and the convex portion at the tip of the turning prevention member is formed in a tapered chevron shape, and the turning prevention member is moved upward by a lock operation. When the wheel direction is within a predetermined angle range centered on the reference position, the turning operation is locked while forcibly moving the wheel direction to the reference position by the guide operation. 3. The double lock mechanism according to claim 1, wherein when the direction is out of a predetermined angle range centered on the reference position, the guide operation is not performed and the lock operation cannot be performed. Caster with. The concave portion of the restricting member is formed in a fan shape having a predetermined opening angle centered on the shaft, a fine uneven portion is provided on the back surface of the concave portion, and the fine uneven portion is provided on the front end surface of the convex portion of the turning prevention member. The convex portion of the turning prevention member can be inserted into the concave portion of the regulating member only when the direction of the wheel is within a predetermined angle range centered on the reference position, and the final movement of the turning prevention member in the upward direction The turning operation of the wheel is locked by engaging the concavo-convex parts of both at the stage, and when the wheel direction is out of the predetermined angle range, the convex part of the turning prevention member is not inserted into the concave part, and the locking operation is performed. The caster with a double lock mechanism according to claim 1 or 2, wherein the caster is configured so as not to be able to.

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