JP5281061B2 - Caster and caster unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caster and a caster unit which surely lock rotation of wheels and have thin thickness. <P>SOLUTION: The caster 10 includes: a body case 20; a rotary case 30; wheels 40; horizontally slidable slide member 50; first lock parts 54 engaged with the slide member 50; rocking member 60 with a second lock part 62 engaged with the body case 20; a lever 70 with a first projection 71, a second projection 72 and a third projection 73; and an operation wire 90 to press the third projection 73. The caster is constructed in such a manner that, when the third projection 73 is pressed by operating the operation wire 90 to turn the lever 70, the slide member 50 is moved by the first projection 71 to unlock rotation locks of the wheels 40 and rock the rocking member 60 by the second projection 72 to unlock a turning lock of the rotary case 30. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to, for example, a caster attached to a desk or the like and capable of moving them, and a caster unit provided with a plurality of the casters.

  For example, a caster for facilitating the movement may be attached to a desk, a side cabinet, furniture, a TV stand, a wagon, a bed, a medical device, or the like housed under the desk. A general caster includes a rotatable wheel, and the wheel can be further horizontally rotated (turned). Such a caster is desired to have a structure in which the rotation and turning of the wheel can be locked so that they do not move easily after setting a desk or the like at a predetermined position.

  In Patent Document 1 below, an inner member that pivotally supports a wheel, an outer member that rotatably holds the inner member, a first uneven portion formed on the shaft portion of the wheel, and a first uneven portion are engaged. A possible first lock member, an urging member for urging the first lock member toward the first uneven portion, and an up-and-down movement to engage the first lock member with the first uneven portion or the first uneven portion The operating member for releasing the engaged state, the second uneven portion formed on the inner wall of the outer member, and the first lock member provided on the inner member and released from the engaged state with the first uneven portion. Then, the latching state with the second uneven portion is released, the inner member can be turned with respect to the outer member, and when the first lock member is engaged with the first uneven portion, the biasing force of the biasing member causes The second uneven portion is hooked so that the inner member cannot turn relative to the outer member. Caster locking mechanism having a second locking member is disclosed.

  The base end of the first lock member is pivotally supported by the inner member via the shaft portion, and the distal end (free end) is connected to the lower end of the operating member that moves up and down. Moreover, the protrusion which engages with the recessed part (1st uneven part) of a wheel is provided in the lower surface of the 1st lock member. Accordingly, when the operating member is moved up and down, the first locking member swings in the vertical direction with the shaft portion on the base end side as a fulcrum. Then, the first lock member swings downward, and the protrusion is engaged with the recess of the wheel, whereby the wheel is rotationally locked.

Japanese Patent No. 3667289

  As described above, in the rotation lock of the wheel in Patent Document 1, as the operation member moves up and down, the first lock member is swung up and down, and the protrusion of the first lock member is engaged with the recess of the wheel. It is made in. However, in this structure, since the operating range of the first lock member is increased in the vertical direction, the height of the entire caster is increased. Therefore, the demerit that it becomes difficult to apply a caster to a member whose height is limited, such as a side cabinet housed under the desk, occurs.

  Moreover, in the said patent document 1, rotation of a wheel is locked by the protrusion of a 1st locking member entering from the upper part to the recessed part located in the uppermost part of a wheel. However, in this structure, when a strong rotational force is applied to the rotation-locked wheel, the first lock member that is swingably supported in the vertical direction swings upward through the protrusion to unlock the wheel. May be made.

  Accordingly, an object of the present invention is to provide a caster and a caster unit capable of reliably locking the rotation of the wheel and reducing the thickness.

  In order to achieve the above object, one aspect of the present invention is a main body case, a rotating case mounted horizontally on the lower surface of the main body case, a wheel rotatably attached to the rotating case, and the rotating A slide member that is slidably mounted in a horizontal direction in the case, a first uneven portion provided on the outer periphery of the boss portion of the wheel, and a first uneven portion provided on the slide member are engaged. A first lock member, a first elastic member for urging the first lock member of the slide member toward the first uneven portion of the wheel, and a second member formed at predetermined intervals on the periphery of the lower surface of the main body case. A concavo-convex portion, a oscillating member that is swingably attached to the rotating case and has a second lock portion that can engage with the second concavo-convex portion of the main body case, and a second lock portion of the oscillating member Is urged toward the second uneven portion of the main body case A second elastic member and a first protrusion, a second protrusion, and a third protrusion that are swingably attached to the rotating case and extend in three directions on the outer periphery, and the first protrusion contacts the slide member. The second protrusion includes a lever that contacts the other end of the swing member, and an operation member that is attached to the main body case and that can press the third protrusion of the lever. When the protrusion is pressed and rotated, the slide member is pressed by the first protrusion and moves against the urging force of the first elastic member, and the first uneven portion and the first lock portion are engaged. Is released, the other end of the swinging member is pressed by the second protrusion, and the swinging member swings against the urging force of the second elastic member. (2) The carriage is configured to be disengaged from the lock portion. To provide a coater.

  According to the above invention, the slide member mounted so as to be slidable in the horizontal direction is provided in the rotating case, and the first lock portion provided on the slide member is provided on the outer periphery of the boss portion of the wheel by the first elastic member. Since the first locking portion of the slide member is engaged with the first concavo-convex portion from the horizontal direction, a strong locking force is exerted regardless of which direction the wheel is rotated. Can be obtained.

  Further, the rotation of the rotating case is locked by urging and engaging the second lock portion of the swing member with the second elastic member to the second uneven portion formed on the lower surface of the main body case. Therefore, in combination with the wheel locking mechanism by the slide member, it is possible to reduce the thickness of the entire caster in the height direction and to provide a caster having a low center of gravity.

  Furthermore, by pressing and rotating the third protrusion of the lever with the operating member, the slide member is moved and the swinging member is rotated to release both the lock of the wheel and the rotation lock of the rotating case. This makes it easier to unlock.

  In a preferred first aspect of the caster of the present invention, a mounting recess having parallel inner surfaces on both sides and inner end surfaces orthogonal to the inner surfaces on both sides is formed on the bottom surface of the rotating case, and the inner end surface central portion is formed. The lever is swingably supported, and the slide member has a U-shape when viewed from above, and the first lock portions are provided at both side end portions between the both side portions and the inner surfaces of both side surfaces. The wheel is slidably mounted in a horizontal direction via a guide provided on the wheel, and the wheel is composed of a pair of coaxially arranged, and has the first concavo-convex portion on the outer periphery of each boss portion. The boss portion is in contact with both inner surfaces of the mounting recess and is rotatably supported, and the slide member is inserted through the first elastic means interposed between the inner end surface and 1st lock part press-contacts to said 1st uneven part It is biased as the first contact portion of the lever is in contact with the lever contact portion provided in the intermediate wall portion of the slide member.

  According to this, the 1st lock part provided in the both ends of a slide member is provided in the outside of a pair of wheels in the state where both sides of the slide member were slidably supported by the both side inner surfaces of the mounting recess. Since it engages with the formed first concavo-convex portion, the rotation of the pair of wheels can be more firmly locked.

  In the first aspect, a cover member that covers at least the inner end surface of the mounting recess, the lever supported by the inner end surface, and the lever contact portion provided on the intermediate wall portion of the slide member, It is preferable that it is attached to the mounting recess. According to this, by covering the interlocking mechanism in the vicinity of the lever with the cover member, it is possible to prevent dust or dust from adhering to the interlocking mechanism and causing malfunction.

  In a second preferred aspect of the caster according to the present invention, a mounting recess in which the wheel is disposed is formed on the bottom surface of the rotating case, and the wheel comprises a pair of coaxially disposed ones. The first concavo-convex part is formed in a boss part provided between them, and the slide member is disposed between the pair of wheels of the attachment concave part, and the first concavo-convex part of the boss part is provided. The first lock portion is urged through the first elastic means so as to be in pressure contact with the first uneven portion.

  According to this, since the 1st uneven | corrugated | grooved part was formed in the boss | hub part provided between a pair of wheels, and the slide member was arrange | positioned between a pair of wheels, a slide member was reduced in size and the 1st elastic member While being able to make it easy to press, a locking mechanism can be concentrated on the center part and assembly workability | operativity can be made favorable.

  In the caster of the second aspect, between the pair of wheels of the mounting recess, in cooperation with the rotating housing, the boss portion provided with the first uneven portion, the slide member, It is preferable that a cover member that covers at least the lever is provided.

  According to this, since not only the interlocking mechanism in the vicinity of the lever but also the first uneven portion provided on the outer periphery of the slide member and the boss portion is covered with the cover member, dust and dust adhere to them and cause malfunction. The possibility can be further reduced.

  In the caster of the present invention, the main body case has a partition wall provided horizontally in the middle in the height direction, and the rotating case is attached to the lower surface of the partition wall, and the upper surface of the partition wall and the rotating case A pin member penetrating through the center is disposed so as to be vertically slidable with its lower end abutting against the third protrusion of the lever, and a cam member that slides horizontally is disposed on the upper surface of the partition wall. The cam surface is in contact with the upper end of the pin member, and the cam member is urged to a position where the pin member is not normally pressed by the third elastic member, and against the urging force of the third elastic member, When the cam member is slid, the pin member is pressed and the third protrusion of the lever is pressed, and the cam member is pressed against the urging force of the third elastic member. The operation wire to slide Being sintered, the pin member, the cam member, it is preferable that the operation member is constituted by the third elastic member and the operation wire.

  According to this, by pulling the operation wire, the cam member slides to push down the pin member, the third protrusion of the lever is pushed, the lever rotates, and the lock of the wheel and the rotation lock of the rotating case are released. be able to. Further, since the operation wire is pulled and the cam member is slid in the horizontal direction to release the lock, it is possible to maintain the state in which the thickness of the entire caster is reduced. Furthermore, an actual operation part can be provided in any location by stretching the wire to any location.

  In another aspect of the present invention, a plurality of casters having the above-described operation wires are provided, the operation wires of these casters are gathered on the way, and the operation wires of the plurality of casters are pulled simultaneously by one operation lever. A caster unit is provided.

  According to the above invention, by operating one operation lever, it is possible to simultaneously pull the operation wires of a plurality of casters and unlock the plurality of casters at the same time. For this reason, when moving a heavy object to which the plurality of casters are attached, the lock of the plurality of casters can be released only by operating one operation lever provided at one place, so that workability can be improved. it can.

  According to the caster of the present invention, since the first lock portion provided on the slide member that slides in the horizontal direction is engaged with the first uneven portion from the horizontal direction, the wheel rotates in any direction. Even if you try to move, you can get a strong locking force. In addition, since the second lock portion is engaged with the second uneven portion on the lower surface of the main body case to lock the rotation of the rotating case, the height of the entire caster is increased in combination with the wheel locking mechanism. The caster can be made thin and have a low center of gravity.

  Further, according to the caster unit of the present invention, by operating one operation lever, the plurality of casters can be unlocked simultaneously by simultaneously pulling the operation wires of the plurality of casters.

It is a disassembled perspective view of 1st Embodiment of the caster which concerns on this invention. It is a principal part disassembled perspective view when the caster is seen from the opposite side of FIG. It is a perspective view of the caster. The locked state of the caster is shown, (a) is a main part bottom view explanatory drawing, (b) is a cross-sectional explanatory drawing. The lock release state of the caster is shown, (a) is a main part bottom view explanatory drawing, (b) is a cross-sectional explanatory drawing. It is a principal part disassembled perspective view of 2nd Embodiment of the caster which concerns on this invention. It is a principal part perspective view of the caster. It is a disassembled perspective view of 3rd Embodiment of the caster which concerns on this invention. It is a principal part disassembled perspective view when the caster is seen from the opposite side of FIG. The locked state of the caster is shown, (a) is an explanatory bottom view of the main part with the cover member removed, and (b) is an explanatory sectional view. The unlocking state of the caster is shown, (a) is a main part bottom view explanatory view of the state where the cover member is removed, and (b) is a cross sectional explanatory view. It is a schematic block diagram of one Embodiment of the caster unit which concerns on this invention. It is the perspective view which fractured | ruptured one part of the operating device which comprises the caster unit.

  Hereinafter, an embodiment of a caster and a caster unit of the present invention will be described with reference to the drawings. First, with reference to FIGS. 1-5, 1st Embodiment of the caster concerning this invention is described.

  As shown in FIG. 1, the caster 10 of this embodiment includes a main body case 20, a rotating case 30 that is mounted on the lower surface of the main body case 20 so as to be horizontally rotatable (turnable), and is rotatable on the rotating case 30. And has wheels 40 attached thereto.

  Referring also to FIG. 2, the main body case 20 has a substantially cylindrical shape, and a mounting flange 21 having a square plate shape as a whole projects from the outer periphery thereof. The caster 10 can be attached to a desk, a side cabinet, or the like through an attachment hole provided in a protruding corner portion of the attachment flange 21. In addition, a partition wall 22 is provided at an intermediate portion in the height direction inside the main body case 20. A pin insertion hole 22a is formed at the center of the partition wall 22 (see FIG. 4B), and a cylindrical boss portion 23 projects from the periphery of the lower surface (see FIG. 2). An annular protrusion 23 a is provided on the outer periphery of the boss 23. The annular protrusion 23a engages with the back surface periphery of a mounting hole 31a of the rotating case 30 described later, so that the rotating case 30 is mounted on the lower surface of the main body case 20 in a horizontally rotatable manner and in a retaining state. ing. Further, a pin member 28 is inserted and arranged inside the cylindrical boss portion 23 so as to be slidable up and down.

  In addition, an annular groove 22b is formed on the outer periphery of the lower surface of the partition wall 22 (see FIG. 4B), and a plurality of balls 22c are arranged so as to be movable in the circumferential direction (see FIG. 2). Further, on the lower surface of the partition wall 22 and on the inner peripheral edge of the annular groove 22b, concave turning lock concave portions 24 are provided at equal intervals in the circumferential direction (see FIG. 2). A convex second lock portion 62 of a swing member 60 described later is detachably engaged with the turning lock recess 24 to lock or lock the horizontal rotation (turning) of the rotary case 30 with respect to the main body case 20. It is made to cancel (refer FIG.4 (b), FIG.5 (b)). That is, the turning lock recess 24 and the portion between them constitute the “second uneven portion” in the present invention. Note that the second concavo-convex portion may be one in which convex portions are arranged at a predetermined interval.

  Further, on the upper surface side of the partition wall 22 inside the main body case 20, a slide space 25 is provided for accommodating a cam member 80 described later so as to be slidable in the horizontal direction. A notch 26 communicating with the slide space 25 is formed on the outer periphery of the upper part of the main body case 20. An operation wire 90 to be described later is inserted and disposed in the notch 26. Further, a lid 27 is attached to the upper opening of the main body case 20 via a plurality of screws 27a (see FIGS. 1 and 2).

  On the other hand, the rotating case 30 has a thick disk shape, and has a mounting recess 32 having a predetermined opening in the circumferential direction and an opening on the lower surface side (see FIGS. 1 and 2). The mounting recess 32 has inner side surfaces 32b, 32b that are parallel to each other and an inner end surface 32c that is orthogonal to the inner surfaces 32b, 32b. A mounting hole 31a into which the boss portion 23 of the main body case 20 is inserted is formed at the center of the upper surface 31 of the rotating case 30 (see FIGS. 2 and 4 (b)). Further, a ball receiving groove 31b is formed on the outer periphery of the upper surface 31 of the rotating case 30, and serves as a portion that receives and supports the ball 23c when the rotating case 30 is mounted on the main body case 20. Further, on the upper surface 31 of the rotating case 30, escape holes 31 c and 31 c for preventing the interference of the wheels 40 and 40 are formed on both sides of the mounting hole 31 a.

  Guide grooves 33, 33 are formed in the inner surface 32b, 32b on both sides of the mounting recess 32 along the horizontal direction, respectively. A guide rib 52b of a slide member 50 described later is inserted into each guide groove 33, and the slide member 50 is held so as to be slidable in the horizontal direction. A shaft hole 33 a for attaching wheels 40, which will be described later, is formed at predetermined positions of each guide groove 33 through the peripheral wall of the rotating case 30.

  In addition, a pair of lever support walls 35 and 35 for swinging and supporting a lever 70 to be described later are provided at the center of the inner end surface 32c of the mounting recess 32 (see FIG. 2). Furthermore, spring receiving seats 32a and 32a for supporting one end of the first elastic member 58 (see FIG. 1) are formed at both ends of the inner end face 32c of the mounting recess 32 (see FIG. 2).

  As shown in FIG. 2, an auxiliary wheel housing recess 36 is formed on the lower surface side of the rotating case 30 and on the opposite side of the circumferential opening of the mounting recess 32. The auxiliary wheel 37 is rotatably held in the auxiliary wheel receiving recess 36 via a shaft 37a.

  On the other hand, on the upper surface side of the rotating case 30 and on the opposite side of the circumferential opening of the mounting recess 32, a swing member housing recess 38 is provided so as to communicate with the mounting recess 32 (FIG. 1). , 2 and FIG. 4B).

  In this regard, the swing member 60 will be described. As shown in FIG. 1, the swinging member 60 has a plate shape with a predetermined length, and a shaft hole 61 is formed in the middle of the length direction. The swinging member 60 is housed and held in the swinging member housing recess 38 via a shaft 63 inserted through the shaft hole 61, and is swingably attached to the rotating case 30. A convex second lock portion 62 is formed on the upper surface of one end of the swing member 60.

  Further, a second elastic member 65 made of a coil spring is interposed in a compressed state between the lower surface of one end of the swing member 60 and the bottom surface of the swing member receiving recess 38 (see FIG. 1). Accordingly, the second lock portion 62 at one end of the swing member 60 is constantly urged toward the region where the turning lock recess 24 (second uneven portion) is formed on the lower surface of the main body case 20 (FIG. 4B). reference). As a result, when the rotating case 30 tries to rotate with respect to the main body case 20, the second lock portion 62 engages with the turning lock recess 24, and the turning of the rotating case 30 with respect to the main body case 20 is locked. In this state, the other end of the swing member 60 is positioned in the mounting recess 32 through the swing member housing recess 38 (see FIG. 4B). Further, a second protrusion 72 of a lever 70 described later is in contact with the lower surface of the other end of the swing member 60 so that the swing member 60 swings with the swing operation of the lever 70. (See FIGS. 4B and 5B).

  The wheel 40 rotatably attached to the rotating case 30 has a center hole 41 formed at the center thereof (see FIG. 4B), and cylindrical bosses 43 and 43 project from the front and back peripheral edges of the center hole 41. It has a set shape. In this embodiment, the two wheels 40 are arranged in the mounting recess 32 of the rotating case 30 in a state where two wheels 40 are arranged in parallel.

  Furthermore, the rotation lock recessed part 45 of a concave shape is provided in the outer periphery of the boss | hub part 43 which protruded outward of each wheel 40 arranged in parallel at equal intervals in the circumferential direction. A convex first lock portion 54 provided on a slide member 50 described later is detachably engaged with the rotation lock recess 45 to lock the rotation of the wheel 40 relative to the rotation case 30. Yes. That is, the rotation lock recess 45 and the portion between them constitute the “first uneven portion” in the present invention. In addition, this 1st uneven | corrugated | grooved part may form the convex part at predetermined intervals.

  In addition, it is preferable that the pair of wheels 40 are connected to each other via the inner boss portion 43 in a state where the rotation lock recesses 45 of the pair of wheels 40 are aligned with each other in the circumferential direction.

  A pair of wheels 40, 40 are coaxially arranged in the mounting recess 32 of the rotating case 30, and the outer surfaces of the boss portions 43, 43 of each wheel 40 are brought into contact with the inner surfaces 32 b, 32 b on both sides of the rotating case 30. A pair of wheels 40, 40 are rotatably attached to the rotating case 30 via the coaxial 47 by making the shaft 47 inserted into the shaft hole 33 a of the rotating case 30 and the center hole 41 of the wheel 40. .

  A slide member 50 is mounted in the rotary case 30 so as to be slidable in the horizontal direction. Referring to FIGS. 1 and 2, the slide member 50 includes a substrate 51 and a pair of side portions 52, 52 arranged orthogonally on both sides thereof, and has a substantially U-shaped frame shape when viewed from the plane. There is no. A cutout 51 a is provided in the middle wall portion at the center of the substrate 51 to allow a swinging operation of a lever 70 described later. In addition, spring receiving seats 51 b and 51 b that support the other end of the first elastic member 58 are formed at both ends of the back surface of the substrate 51. Further, a lever abutting portion 51c is formed in the middle wall portion at the center of the substrate 51 along the lower side of the notch 51a. A first protrusion 71 of a lever 70 described later is brought into contact with the lever contact portion 51c so that a pressing force from the lever 70 acts on the slide member 50 (FIGS. 4B and 5). (See (b)).

  Notches 52a and 52a are formed at the ends of the side portions 52 and 52, respectively (see FIG. 1). These notches 52a and 52a are portions that escape so as not to interfere with the boss portions 43 and 43 protruding outward of the wheels 40 when the slide member 50 is elastically biased by a first elastic member 58 described later. It has become. In addition, guide ribs 52 b and 52 b extend on the outer surfaces of the side portions 52 and 52 along the sliding direction of the slide member 50. Further, convex first lock portions 54, 54 project from the inner surfaces of the front end portions of both side portions 52, 52, respectively.

  The pair of guide ribs 52b and 52b are inserted into the guide grooves 33 and 33 of the rotating case 30, and the slide member 50 is slidably mounted in the mounting recess 32 of the rotating case 30 in the horizontal direction. ing. That is, the slide member 50 is mounted so as to be slidable in the horizontal direction via guides provided between both side portions 52, 52 thereof and both side inner surfaces 32b, 32b of the rotating case 30. In this embodiment, the guide groove 33 and the guide rib 52b form the “guide”. However, the guide groove may be provided on the slide member 50 side, and the guide rib may be provided on the rotating case 30 side, which is particularly limited. It is not a thing. In the above state, the U-shaped slide member 50 is disposed so as to enclose the pair of wheels 40, 40, and between the inner surfaces 32 b, 32 b of the mounting recess 32 and the outer surfaces of the wheels 40, 40. Further, both side portions 52, 52 of the slide member 50 are arranged.

  As shown in FIGS. 1 and 2, first elastic members 58 and 58 formed of coil springs are provided between the spring receiving seats 32 a and 32 a of the rotating case 30 and the spring receiving seats 51 b and 51 b of the slide member 50. It is inserted in a compressed state. Therefore, the slide member 50 that slides in the horizontal direction is elastically pressed forward (the circumferential opening side of the mounting recess 32) by the first elastic members 58 and 58, whereby the first lock portion 54 of the wheel 40 is moved. It is urged toward the rotation lock recess 45 (first uneven portion), and the first lock portions 54 enter and engage with the rotation lock recess 45 from the horizontal direction so that the rotation of the wheels 40 and 40 is normally locked. (See FIG. 4B).

  The slide operation of the slide member 50 and the swing operation of the swing member 60 are controlled by a lever 70. Referring to FIGS. 2, 4, and 5, the lever 70 includes a cylindrical body 75 having a shaft hole 75 a, a first protrusion 71 extending obliquely downward from the outer periphery of the cylindrical body 75 on the wheel side, The cylindrical body 75 includes a second protrusion 72 extending obliquely upward from the outer periphery of the swinging member side of the cylinder 75 and a third protrusion 73 extending substantially horizontally from the outer periphery of the cylinder 75 on the wheel side. A shaft 77 inserted through the shaft hole 75a is supported by a bearing recess 35a (see FIG. 2) of each lever support wall 35 of the rotating case 30, and the lever 70 is swingably mounted on the rotating case 30. It has become so.

  In addition, as shown in FIG. 4B, in the state where the slide member 50 is elastically biased toward the wheel by the first elastic member 58, the first protrusion 71 of the lever 70 is the lever contact of the slide member 50. The second protrusion 72 is in contact with the lower surface of the other end of the swing member 60, and the third protrusion 73 is the lower end of the pin member 28 that is inserted into the boss part 23 of the rotating case 30. Abut. When the pin member 28 slides downward, the lever 70 is rotated via the third protrusion 73, the first protrusion 71 presses the lever contact portion 51 c, and the slide member 50 is moved to the first elastic member 58. The second protrusion 72 pushes up the other end of the swinging member 60 and swings one end thereof downwardly against the biasing force of the second elastic member 65. (See FIG. 5B).

  Next, an operation member attached to the main body case 20 and pressing the third protrusion 73 of the lever 70 will be described. As shown in FIG. 1, the operation member includes a cam member 80 that is accommodated in the slide space 25 of the main body case 20 so as to be slidable in the horizontal direction. The cam member 80 has a bifurcated shape with a gap 81 therebetween, a wire locking groove 82 is formed at the base end portion thereof, and an axial slide hole 83 is formed along the longitudinal direction. Further, a tapered cam surface 85 whose height gradually decreases from the middle in the longitudinal direction toward the base end side is formed on the lower surface of the cam member 80 (FIGS. 4B and 5B). reference). The cam surface 85 comes into contact with the upper end of the pin member 28 and slides the pin member 28 up and down by the sliding operation of the cam member 80. The cam member 80 is disposed in the slide space 25 of the main body case 20, and the shaft 86 is inserted into the shaft holes 25 a and 25 a on both sides of the slide space and the shaft slide holes 83 of the cam member 80. Is held in the slide space 25 so as to be slidable in the horizontal direction.

  Further, one end of a third spring-like elastic member 88 is locked to the back of the slide space of the main body case 20 via a shaft 88a, and the other end of the third elastic member 88 is connected via a shaft 87. The cam member 80 is locked at the tip. As a result, the cam member 80 is constantly elastically biased by the third elastic member 88 at a position where the cam surface 85 does not press the pin member 28 (see FIG. 4B).

  One end 91 of the operation wire 90 is locked in the wire locking groove 82 of the cam member 80. One end 91 of the operation wire 90 has a substantially spherical shape, and the one end 91 is engaged with the inner peripheral edge of the wire locking groove 82 of the cam member 80 so that the operation wire 90 is connected to the cam member 80. It has become. A protective cylinder 92 is disposed on the outer periphery of the operation wire 90, and locking grooves 92a and 92a are formed at both ends thereof. Then, as shown in FIG. 1, one end portion of the operation wire 90 is arranged in the notch 26 of the main body case 20, and the locking plate 94 is inserted into the locking groove 92a, and both sides thereof are cut off of the main body case 20. The protection cylinder 92 is attached to the main body case 20 by being engaged with the groove 26a in the vicinity of the notch. The pin member 28, the cam member 80, the third elastic member 88, and the operation wire 90 constitute the “operation member” in the present invention.

  Next, the function and effect of the caster 10 having the above structure will be described.

  As shown in FIGS. 4A and 4B, in a state where the operation wire 90 is not pulled, the cam member 80 is elastically biased by the third elastic member 88, and the cam surface 85 does not press the pin member 28. Placed in position.

  The slide member 50 is elastically biased in the direction of the wheels 40 and 40 by the first elastic members 58 and 58. When the wheels 40 and 40 are about to rotate, the first lock portions 54 and 54 are , 40 is inserted into and engaged with the rotation lock recesses 45, 45 (first concave and convex portions) from the horizontal direction, and the rotation of the wheels 40, 40 is locked.

  Further, the swinging member 60 is urged by the second elastic member 65, and the second lock portion 62 provided at one end thereof is pressed against the lower surface of the rotating case 30, and the rotating case 30 tries to rotate. The rotation of the rotary case 30 is locked by engaging with the turning lock recess 24.

  At this time, as shown in FIG. 4B, the lever 70 has the first protrusion 71 in contact with the lever contact portion 51 c of the slide member 50, and the second protrusion 72 has the other end of the swing member 60. And the third protrusion 73 is held in a substantially horizontal posture. The lower end of the pin member 28 is in contact with the third protrusion 73 of the lever 70.

  Thus, when the operation wire 90 is not operated at all, both the rotation of the wheel 40 and the turning of the rotation case 30 with respect to the main body case 20 can be locked.

  According to the caster 10, the first lock portion 54 provided on the slide member 50 that slides in the horizontal direction is attached to the rotation lock recess 45 (first uneven portion) of the wheel 40 by the first elastic member 58. Since the first lock portion 54 is engaged with the rotation lock recess 45 from the horizontal direction (see FIG. 4B), the lock is strong regardless of which direction the wheel 40 rotates. You can gain power. Therefore, even if a strong force acts on the desk or side cabinet to which the caster 10 is attached, it is possible to reliably prevent the rotation lock of the wheel 40 from being released.

  Further, at the time of this locking, the guide ribs 52 of the both side portions 52, 52 of the slide member 50 are inserted into the guide grooves 33 of the mounting recess 32 of the rotating case 30, so that the slide member 50 can slide on the both side inner surfaces 32b, 32b. The first lock portions 54, 54 provided on the inner surfaces of the front end portions of the both side portions 52, 52 of the slide member 50 are supported by the rotation lock recesses 45, provided outside the pair of wheels 40, 40. 45, respectively, so that the rotation of the pair of wheels 40, 40 can be more firmly locked.

  Furthermore, by urging and engaging the second lock portion 62 of the swing member 60 with the second elastic member 65 in the turning lock recess 24 (second uneven portion) formed on the lower surface of the main body case 20, Since the turning (horizontal rotation) of the rotating case 30 is locked, the thickness of the entire caster can be reduced in combination with the locking mechanism of the wheel 40 by the slide member 50, and the caster 10 having a low center of gravity can be obtained. Can be provided. For this reason, for example, it can be suitably used as a caster for a side cabinet or the like that is movably disposed below the desk and is difficult to secure a height space.

  The unlocking operation of the rotation lock of the wheel 40 and the rotation lock of the rotation case 30 shown in FIGS. 4A and 4B is performed as follows. This will be described with reference to FIGS. 5 (a) and 5 (b).

  That is, when the operation wire 90 is pulled against the urging force of the third elastic member 88, the cam member 80 slides horizontally, and the upper end of the pin member 28 is pressed by the cam surface 85. Then, the pin member 28 is pushed downward, the lower end thereof presses the third protrusion 73 of the lever 70, and the lever 70 swings. Accordingly, the first protrusion 71 of the lever 70 presses the lever contact portion 51 c of the slide member 50, and the slide member 50 is slid against the urging force of the first elastic member 58 to rotate the wheel 40. The first lock portion 54 is pulled out from the lock recess 45 (first uneven portion), the rotation lock of the wheel 40 is released, and free rotation is possible. At the same time, the second protrusion 72 of the lever 70 pushes up the other end of the swinging member 60, and one end of the swinging member 60 swings downward, and the turning lock recess 24 (second uneven portion) on the lower surface of the main body case 20. Then, the second lock portion 62 is removed, the turning lock of the rotary case 30 with respect to the main body case 20 is released, and the rotary case 30 can freely rotate horizontally.

  As described above, both the rotation lock of the wheel 40 and the rotation lock of the rotation case 30 can be released at a time only by pulling the operation wire 90 against the urging force of the third elastic member 88 ( The unlocking operation can be easily performed (see FIG. 5B). In addition, since the cam member 80 is slid horizontally by pulling the operation wire 90, the lock structure of the slide member 50 that slides horizontally and the lock structure of the wheel 40 described above is combined. The state where the thickness in the height direction is reduced can be maintained. That is, since not only the lock structure but also the unlock structure is a horizontal slide structure, the caster 10 can be effectively thinned and can be suitably used as a caster for a side cabinet or the like.

  6 and 7 show a second embodiment of a caster according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. The caster 10a of this embodiment is provided on an inner end surface 32c of the mounting recess 32 of the rotating case 30, a lever 70 swingably supported on the inner end surface 32c, and an intermediate wall portion of the substrate 51 of the slide member 50. And a cover member 110 that covers at least the lever contact portion 51c.

  The cover member 110 has a long plate-like bottom wall 111 extending at a length suitable for the distance between the inner surfaces 32b, 32b of the rotating case 30, and the center of one side along the longitudinal direction of the bottom wall 111. It has the standing wall 113 extended so as to be orthogonal to the bottom wall 111, and a box-shaped lever cover 115 provided on the outer surface of the end of the standing wall 113. Engagement projections 111a and 111a projecting outward are provided on the back surfaces of both ends of the bottom wall 111 in the longitudinal direction. A recess 111b having a predetermined width is formed at the center of the other side along the longitudinal direction of the bottom wall 111.

  On the other hand, engaging grooves 32d and 32d for engaging the engaging protrusions 111a and 111a of the cover member 110 are formed at both ends of the inner end surface 32c of the rotating case 30 and in the vicinity of the opening of the mounting recess 32, respectively. Has been. Between the engagement grooves 32d and 32d, a protrusion 32e that protrudes into the recess 111b of the cover member 110 projects from the center of the inner end surface 32c.

  And after arrange | positioning the slide member 50, the lever 70, and a pair of wheel 40,40 in the attachment recessed part 32, respectively, it inserts in the attachment recessed part 32 of the cover member 110, and the lever cover 115 is interposed between the wheels 40,40. As shown in FIG. 7, the lever 70 is disposed to cover the concave portion 111b with the protrusion 32e and the pair of engaging protrusions 111a and 111a are engaged with the engaging grooves 32d and 32d. The cover member 110 can be attached to the recess 32 in a state that prevents the cover member 110 from coming off.

  When the cover member 110 is attached to the attachment recess 32 in this manner, the interlocking mechanisms in the vicinity of the lever 70 such as the inner end face 32c, the lever 70, the lever contact portion 51c of the slide member 50, and the like can be covered. It is possible to make it difficult for dust and dirt to adhere to the interlocking mechanism, and to prevent malfunction of the caster.

  8 to 11 show a third embodiment of a caster according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The caster 10b of this embodiment is different from the first and second embodiments in the position of the first uneven portion provided on the wheel 40, and the shapes of the slide member 130, the lever 70a, and the like are associated therewith. Is different.

  That is, as shown in FIGS. 8 and 9, a pair of integrally formed wheels 40, 40 are coaxially arranged in the mounting recess 32 of the rotating case 30 and provided between the wheels 40, 40. On the outer periphery of the boss portion 43, concave rotation lock concave portions 45 are formed at equal intervals in the circumferential direction.

  As shown in FIG. 9, the mounting recess 32 of the rotating case 30 is provided with a support portion 120 that rotatably supports the wheels 40, 40 and slide-supports the slide member 130. The support portion 120 has a pair of side walls 121 and 121 parallel to each other, and bearing recesses 123 and 123 for receiving and holding the boss portions 43 between the wheels 40 and 40 are provided on the side walls 121, respectively. Yes. Further, guide ribs 125 project from the inner surface of each side wall 121 on the base side (the inner end surface 32 c side). Further, a cover mounting wall 126 having an engaging groove 127 is provided between the pair of side walls 121 and 121 above the side wall 121 on the base side. An engagement hole 128 is formed at the tip of the support portion 120.

  A pair of auxiliary wheel housing recesses 36, 36 are formed in the vicinity of the inner end surface 32c of the mounting recess 32 on the bottom surface of the rotating case 30, so that the pair of auxiliary wheels 37, 37 can rotate via the shaft 37a. Contained and held.

  The slide member 130 has a block shape that can be inserted between the side walls 121 and 121 of the support portion 120, and rib-shaped protrusions 131 and 132 protrude from the center and the lower end of the tip, respectively. A pair of protruding protrusions 133 and 133 protrude from above. As shown in FIG. 10, the protrusions 131, 132, and 133 are engaged with the rotation lock recesses 45 of the boss portion 43, respectively, so that the wheels 40 and 40 are rotationally locked. The protrusions 131, 132, and 133 form the “first lock portion” in the present invention.

  Guide grooves 135 into which the guide ribs 125 are inserted are formed on both sides of the slide member 130, and a concave lever contact portion 137 is provided from above the base side of the slide member 130, and further, the center of the base end surface of the slide member 130 is provided. A spring support protrusion 138 (see FIG. 10) is provided to support one end of the first elastic member 58.

  As shown in FIGS. 8 and 10, the lever 70a includes a main body 76 having a shaft hole 75a, a first protrusion 71 extending obliquely downward from the main body 76, and the main body 76 toward the swing member 60 side. It has the 2nd protrusion 72 which protruded in the shape of a nail | claw, and the 3rd protrusion 73 extended from the main body 76 toward the wheel 40 side substantially horizontally. The lever 70 a is configured such that a shaft 77 inserted through the shaft hole 75 a is fitted into a lever support recess 39 provided adjacent to the swing member housing recess 38 provided on the upper surface of the rotation case 30. Is swingably mounted.

  Further, a cover member is attached to the caster 10b. The cover member 140 is formed with a width that fits between the wheels 40, 40 as a whole, a plate-like bottom wall 141, and an upright wall 143 suspended from one end of the bottom wall 141 via an R portion. A pair of side walls 145 and 145 are erected from both side edges of the bottom wall 141. Each side wall 145 is provided with a bearing recess 146 that rotatably supports the boss 43 between the wheels 40, 40. Further, an engaging protrusion 147 that engages with the engaging groove 127 (see FIG. 9) protrudes from the other end of the bottom wall 141, and further, from the tip of the standing wall 143, the engaging hole An engaging claw 148 that engages with 128 (see FIGS. 8 and 9) protrudes.

  Each member is mounted as follows. That is, the first elastic member 58 is disposed in the back of the support portion 120 with the lever 70a being pivotally supported as described above, the guide groove 135 is aligned with the guide rib 125, and the slide member is placed in the support portion 120. 130 is pushed in and the first elastic member 58 is compressed and disposed through the spring support protrusion 138, the first protrusion of the lever 70 a is inserted into the concave lever contact portion 137, and the bearing recesses 123 and 123 are further inserted. The boss 43 between the wheels 40 is disposed, and the shaft 47 is inserted into the shaft hole 33 a of the rotating case 30 and the center hole 41 of the wheel 40. As a result, the wheels 40 are rotatably attached to the attachment recess 32, and the slide member 130 is slidably supported via the guides (guide ribs 125 and guide grooves 135). As shown in FIG. The elastic member 58 is elastically biased toward the wheel 40, and the protrusions 131, 132, 133 are engaged with the rotation lock recess 45, respectively, so that the rotation of the wheels 40, 40 is always locked. ing.

  Then, the cover member 140 is aligned between the wheels 40 disposed in the mounting recess 32, and the engagement protrusion 147 and the engagement claw 148 are respectively inserted into the engagement groove 127 and the engagement hole 128 of the rotating case 30. By engaging, the cover member 140 is attached to the mounting recess 32.

  As described above, when the cover member 140 is attached to the attachment recess 32, the entire support portion 120 is covered, the lever 70a and the slide member 130 are covered, and the boss portion 43 between the wheels 40, 40 is covered, and the lever Since not only the interlocking mechanism in the vicinity of 70a but also the rotation lock recess 45 on the outer periphery of the slide member 130 and the boss portion 43 can be covered, the possibility that dust, dust, etc. will adhere to them and cause malfunction will be further reduced. Can do.

  Further, in the third embodiment, the rotation lock recess 45 is formed on the outer periphery of the boss portion 43 provided between the wheels 40, 40 and the slide member 130 is positioned between the wheels 40, 40. Since the slide member 130 can be made smaller than the U-shaped slide member 50 of the first embodiment and the first elastic member 58 can be made into one coil spring, The lock mechanism can be concentrated in the central portion, and the assembly workability can be improved.

  In the caster 10b having the above-described structure, the rotation lock operation of the wheel 40 and the rotation lock operation of the rotation case 30, the rotation lock release operation of the wheel 40, and the rotation lock release operation of the rotation case 30 are the same as in the above embodiment.

  Briefly, when the operation wire 90 is pulled from the state in which the rotation of the wheel 40 is locked and the turning of the rotating case 30 is locked (see FIG. 10), the cam member 80 is horizontal as shown in FIG. The pin member 28 is pushed downward by the cam surface 85, the third protrusion 73 of the lever 70a is pushed, and the lever 70a swings. The first protrusion 71 inserted into the concave lever contact portion 137 of the slide member 130 presses the lever contact portion 137 and resists the urging force of the first elastic member 58. The projections 131, 132, 133 are removed from the rotation lock recess 45 of the wheel 40, and the rotation lock of the wheel 40 is released. At the same time, the second protrusion 72 of the lever 70 a pushes up the other end of the swinging member 60, one end of the swinging member 60 swings downward, and the second lock portion 62 is disengaged from the turning lock recess 24 to rotate. The turning lock of the case 30 is released.

  Next, an embodiment of the caster unit of the present invention in which a plurality of casters 10 of the first embodiment are provided will be described.

  FIG. 12 shows a schematic configuration diagram of a caster unit 10A in this embodiment. That is, the caster unit 10 </ b> A includes a plurality of casters 10 attached to predetermined positions on the bottom surface of the attached member 1 such as a side cabinet, and an integrated operation of the plurality of casters 10 attached to predetermined places on the attached member 1. The interlocking device 2 for simultaneously pulling the wires 90 and the operation device 3 that is disposed at a predetermined position of the attached member 1 and performs the pulling operation of the interlocking device 2 are provided. In this embodiment, casters 10 according to the present invention are attached to two opposite corners of the bottom surface of the member 1 to be attached, and ordinary casters 100 without a lock mechanism are attached to the remaining two corners. Yes. Instead of the caster 10, the caster 10a of the second embodiment or the caster 10b of the third embodiment may be used.

  The interlocking device 2 has a slide body 2a that is slidable in a predetermined direction, and the other ends 95 of the operation wires 90 extending from the plurality of casters 10 are respectively connected to one side thereof. The operation wires 90 are collectively held. On the other hand, one end 91 of another operation wire 90A is connected to the other side of the slide body 2a.

  The other end 95 of the operation wire 90A connected to the slide body 2a is connected to the operation device 3 shown in FIG. The operating device 3 includes a housing 4, a shaft 5 supported between the bottom wall 4 a and the frame-like wall 4 b of the housing 4, and an operating lever 6 that is supported by the shaft 5 and can swing in a predetermined direction. have. A key groove 7 extending along the swinging direction of the operation lever 6 is formed on the front wall 4 c of the housing 4. The key groove 7 includes a long groove-like slide groove 7a and a lock release groove 7b that is disposed near the bottom wall 4a and that is continuous with the slide groove 7a. Further, a push spring 6a is interposed between the frame-like wall 4b and the operation lever 6, and elastically biases the operation lever 6 toward the bottom wall 4a side. Further, a tension spring 6 b is mounted between the tip of the operation lever 6 and the end of the housing 4, and elastically biases the operation lever 6 in the direction of the slide groove 7 a of the key groove 7. The other end 95 of the operation wire 90 </ b> A is connected to the vicinity of the proximal end of the operation lever 6.

  When the operating lever 6 is swung from the proximal end of the slide groove 7a to the distal end side against the biasing force of the pulling spring 6b, the operating lever 6 is locked by being biased by the push spring 6a and the pulling spring 6b. Engage with the release groove 7b and the state is maintained. In this state, when the operating lever 6 is swung from the unlocking groove 7b to the tip of the slide groove 7a against the urging force of the pulling spring 6b and the pressing spring 6a, the urging force of the pulling spring 6b causes the operating lever 6 to move. It moves to the base end of the slide groove 7a.

  When the caster unit 10A having the above structure is used, when the operating lever 6 of the operating device 3 is operated to engage with the unlocking groove 7b of the keyway 7, the interlocking device 2 is connected via the operating wire 90A. Since the slide body 2a slides and the integrated operation wires 90 and 90 are pulled simultaneously, the rotation lock and the rotation lock of the plurality of casters 10 can be simultaneously released. For example, when the mounted member 1 such as a side cabinet is moved, the rotation lock and the rotation lock of the plurality of casters 10 can be released by operating only one operation lever 6, so that the mounted member 1 is moved smoothly. be able to. When the rotation of the plurality of casters 10 is locked, the operation lever 6 is removed from the lock release groove 7b and moved to the base end side of the slide groove 7a. Again, the attached member 1 such as a side cabinet is fixed at a predetermined position.

DESCRIPTION OF SYMBOLS 1 Mounted member 2 Interlocking device 2a Slide body 3 Operation device 4 Housing 4a Side wall 4b Frame-like wall 4c Front wall 5 Shaft 6 Operation lever 6a Push spring 6b Pull spring 7 Key groove 7a Slide groove 7b Unlock groove 10, 10a, 10b Caster 10A Caster unit 20 Main body case 21 Mounting flange 22 Bulkhead 22a Pin insertion hole 22b Annular groove 22c Ball 23 Boss part 23a Annular protrusion 24 Turning lock concave part (second uneven part)
25 Slide space 25a Shaft hole 26 Notch 26a Groove 27 Lid 27a Screw 28 Pin member 30 Rotating case 31 Upper surface 31a Mounting hole 31b Ball receiving groove 31c Relief hole 32 Mounting recess 32a Spring receiving seat 32b, 32b Inner surface 32c Inner end surface 32d Engaging groove 32e protrusion 33 guide groove 33a shaft hole 35 lever support wall 35a bearing recess 36 auxiliary wheel receiving recess 37 auxiliary wheel 37a shaft 38 swinging member receiving recess 39 lever support recess 40 wheel 41 center hole 43 boss 45 rotation lock Concave part (first uneven part)
47 Shaft 50 Slide member 51 Substrate 51a Notch 51b Spring receiving seat 51c Lever contact part 52, 52 Both sides 52a Notch 52b Guide rib 54 First lock part 58 First elastic member 60 Oscillating member 61 Shaft hole 62 Second lock Portion 63 Shaft 65 Second elastic member 70, 70a Lever 71 First protrusion 72 Second protrusion 73 Third protrusion 75 Cylindrical body 75a Shaft hole 76 Main body 77 Shaft 80 Cam member 81 Air gap 82 Wire locking groove 83 Shaft slide hole 85 Cam Surface 86 Shaft 87 Shaft 88 Third elastic member 88a Shaft 90, 90A Operation wire 91 One end 92 Protective tube 92a Locking groove 94 Locking plate 95 Other end 110 Cover member 111 Bottom wall 111a Engagement protrusion 111b Recession 113 Standing wall 115 Lever cover 120 Support portion 121 Side wall 123 Bearing recess 125 Guide rib 126 Cover mounting wall 127 Engaging groove 1 8 engaging hole 130 sliding member 131, 132, 133 protrusions 135 guide groove 137 lever contact portion 138 spring supporting protrusion 140 covering member 141 bottom wall 143 vertical wall 145 side wall 146 bearing recess 147 engages protrusion 148 engaging claws

Claims (7)

A body case,
A rotating case mounted on the lower surface of the main body case so as to be horizontally rotatable;
A wheel rotatably mounted on the rotating case;
A slide member mounted slidably in the horizontal direction in the rotating case;
A first uneven portion provided on the outer periphery of the boss portion of the wheel;
A first lock portion that is provided on the slide member and engages with the first uneven portion;
A first elastic member for urging the first lock portion of the slide member toward the first uneven portion of the wheel;
Second concavo-convex portions formed at predetermined intervals on the periphery of the lower surface of the main body case;
A swing member that is swingably attached to the rotating case and has a second lock portion at one end that can be engaged with the second uneven portion of the main body case;
A second elastic member for urging the second lock portion of the swing member toward the second uneven portion of the main body case;
The rotating case is swingably mounted and has a first protrusion, a second protrusion, and a third protrusion extending in three directions on the outer periphery. The first protrusion abuts on the slide member, and the second protrusion A lever that contacts the other end of the swing member;
An operation member attached to the main body case and capable of pressing the third protrusion of the lever;
When the third protrusion of the lever is pressed and rotated by the operating member, the slide member is pressed by the first protrusion and moves against the urging force of the first elastic member, and the first uneven portion And the first lock portion are disengaged, and the other end of the swing member is pressed by the second protrusion, so that the swing member swings against the urging force of the second elastic member. The caster is configured such that the engagement between the second uneven portion and the second lock portion is released.   A mounting recess having parallel inner surfaces on both sides and inner end surfaces orthogonal to the inner surfaces on both sides is formed on the bottom surface of the rotating case, and the lever is swingably supported at the center of the inner end surface. The member has a U-shape when viewed from above, and the first lock portion is provided at both ends of the member, and can be slid in the horizontal direction via guides provided between the both sides and the inner surfaces of both sides. The wheel is composed of a pair of coaxially arranged wheels, each of which has the first concavo-convex portion on the outer periphery of the outer boss portion, and the boss portion on both side surfaces of the mounting recess. The slide member is supported so as to be rotatable, and the first lock portion is pressed against the first uneven portion through first elastic means interposed between the slide member and the inner end surface. And the first contact portion of the lever is Caster of claim 1, wherein the lever contact portion provided in the intermediate wall portion in contact with the slide member.   A cover member that covers at least the inner end surface of the mounting recess, the lever supported by the inner end surface, and the lever contact portion provided on the intermediate wall of the slide member is mounted on the mounting recess. The caster according to claim 2.   A mounting recess in which the wheel is disposed is formed on the bottom surface of the rotating case, and the wheel is composed of a pair of coaxially disposed components, and the boss portion provided between them has the first 1 uneven | corrugated | grooved part is formed, the said slide member is arrange | positioned between the said pair of wheel of the said attachment recessed part, and is supported so that it can slide toward the 1st uneven | corrugated | grooved part of the said boss | hub part, and said 1st elasticity 2. The caster according to claim 1, wherein the first lock portion is biased so as to be pressed against the first uneven portion via the means.   A cover member that covers at least the boss portion provided with the first uneven portion, the slide member, and the lever is provided between the pair of wheels of the mounting recess in cooperation with the rotating housing. The caster according to claim 4.   The main body case has a partition wall provided horizontally in the middle in the height direction, the lower surface of the partition wall forms the lower surface of the main body case, and the rotating case is attached to the lower surface of the partition wall. And a cam member penetrating through the center of the upper surface of the rotating case, the pin member being slidable up and down with its lower end in contact with the third projection of the lever, and sliding horizontally on the upper surface of the partition wall. And the cam surface of the cam member is in contact with the upper end of the pin member, and the cam member is urged to a position where the pin member is not normally pressed by the third elastic member. When the cam member is slid against the urging force, the pin member is pressed and the third protrusion of the lever is pressed, and the cam member is resistant to the urging force of the third elastic member. And slide the cam member Operation wire is coupled, said pin member, said cam member, said third elastic member and the caster according to any one of claims 1 to 5, wherein the operating member is constituted by the operating wire.   A plurality of casters according to claim 6 are provided, and the operation wires of these casters are gathered in the middle, and the operation wires of the plurality of casters are simultaneously pulled by one operation lever. Caster unit.