JPH03178804A - Caster - Google Patents

Abstract

PURPOSE:To enhance the operability of a caster for furniture or the like by interlocking a wheel locking means and a pivot locking means with the vertical oscillation of an operation layer and continuously so connecting both locking means to each other as to come to locking and unlocking positions with the operation lever. CONSTITUTION:When an operation lever 24 is moved up, a lock pin 20 comes to be engaged with the first engagement recess part 28 and moves under pressure in the inward direction against the force of a spring 21. As a result, the pin 20 is off the engagement grooves 2 of wheels 1 and 1' and a caster becomes free to move in all direction. In this state, arm receiving parts 17 and 18 comes to be positioned on the narrowest upper ends of the cam faces 31a and 31b of a pair of operation plate 22, and are pressed in a direction opposite to each other. As a result, arm parts 16e and 16f moves in a direction opposite to the coil direction of one-way springs 16a and 16b, thereby unlocking a pivot 10 for the free turn thereof. The lock pin 20 at the second engagement position 29 enables the motion of the caster in all directions and the locking of the turn thereof, and at the third engagement position 30, locks both of the motion and turn of the caster, thereby improving the operability of the caster.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to twin-wheeled casters that are attached to various types of furniture, office equipment, etc., and particularly to a locking mechanism between the wheels and the pivot shaft.

(Prior art) The locking mechanism for conventional twin-wheel casters is a locking mechanism of a brake plate specially installed in a locking groove formed on the inner circumference of the wheel.
A structure in which the rotation of the wheel is stopped by engaging the pawl, and as seen in Japanese Patent Application Laid-Open No. 6133302, a locking receiver and a wheel integrally provided at the lower end of the pivot shaft. By locking the pivot shaft latches L) and A provided on the lock slider and the wheel engagement claws in the locking grooves on the inner periphery, the wheel, the wheel support body, and the pivot shaft are mutually locked together with the wheel. There are also known devices that are configured so that they can be unlocked and unlocked at the same time.

(Problem to be Solved by the Invention) However, casters generally have a pivot shaft protruding from the eccentric position of the main body for attaching to furniture, etc., so only the wheels are opened as in the former conventional example above. 7 Even if the main body is rotatable with respect to the pivot shaft, the pivot shaft will rotate in a circle around the ground point of the wheel on the floor, etc. When in use, the bed, etc. will swing even though the wheels are locked, and it may not be possible to stop it completely in the specified position, or if the basic equipment with casters is pushed. When transporting on a slope, even if the wheels are locked in the middle, the caster body will still rotate, which is dangerous.

In addition, when trying to take a refrigerator into or out of a limited space, the refrigerator will be swung left and right due to the relocation of one unit, and as a result, the refrigerator being pushed will move around adjacent furniture, etc. in the space. This can lead to collisions and make the entry/exit work difficult.

Therefore, in the case of the former type of casters, when the casters are installed on the bottom surface of the object to which the casters are attached, such as furniture, and the casters are to be attached to the +iij part and the rear part of the object, the casters, on which the main body rotates, are attached to the front part. For example, you will have to choose a caster that takes into account the combination, such as using traditional casters that do not rotate the main body at the rear.

In addition, with the latter type of casters, not only the wheels but also the pivot shaft can be locked, so objects to which the casters are attached, such as furniture, can be completely stopped in a predetermined position. Since both are locked and unlocked at the same time, for example, when pushing a refrigerator etc. between furniture on the left and right or pulling it out as described in +iii, the main unit will end up rolling due to the unlocking operation and will not be able to travel in a straight line. Problems similar to the former will arise, such as difficulty in movement.

Furthermore, when operating the lock slider that locks and unlocks the wheels and rotation axes, it is difficult to determine at a glance whether the wheels are in the locked or unlocked state, which is very confusing. It has become something to behold.

The present invention has been made in view of the above-mentioned problems with the conventional casters, and it is not only possible to lock and unlock the wheel and the swivel axis at the same time, but also to lock and unlock only the swivel FIj'l axis independently. By configuring the iTf function, the furniture, etc. can be stopped in a predetermined position in a completely immovable state, and the above-mentioned furniture, etc. can be moved forward and backward only in a straight line, and this can be done in a limited space. The purpose is to improve operability by making it possible to easily and reliably put in and take out the wheels and to make it possible to distinguish at a glance whether the wheels and pivot axle are locked or unlocked, and whether the pivot axle is locked. be.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides
A pair of left and right wheels formed with grooves and fixed to both ends of the axle, and a section that hangs down between the two wheels from an outer wall covering the E side of the two axles and rotatably supports the middle part of the axle. 2. A caster consisting of a main body having a wall and opening downward, and a pivot shaft erected on one side of the main body so as to rotate. (h) A wheel that is installed laterally through the partition wall of the main body and is biased in the radial direction by a spring, and that has a lock pin that is slidable in the radial direction to be engaged with and disengaged from the groove 11 of the axles. a locking means; a pivot locking means having a locking member disposed within one side of the wooden body and capable of stopping rotation of the pivot shaft by coming into contact with the outer circumference of the pivot shaft; and a section of the main body. The axle is located between the wall and both wheels so that the axle can be rotated in the circumferential direction with the protruding operation lever extending outward from a window hole opened in the circumferential direction of the outer wall of the main body. has a pair of operation plates attached to both operation plates, the lock pin is removably locked and held in a state in which the lock pin is removed from the locking groove of the wheel, and the operation plate is held in this state. The first locking recess and the second locking recess having a shallow depth in the radial direction to be held and the lock pin can be engaged with the locking groove of the wheel, and the lock pin is engaged in the engagement +h state. A third locking recess with a deep radial depth for holding the operating plate in a removable state is provided on the side of the guide elongated hole of the lock bin at a required interval in the circumferential direction. i! ! By rotation of both operation plates in the circumferential direction by the operation lever, the lock pin is moved to the second position. and an operating means formed with a cam portion for operating the locking member in a direction that brings the pivoting sleeve into a restraining state in each of the third locking recesses and the locked state. The purpose of this project is to provide a caster with the following characteristics.

(Function) In the caster configured as described above, when the operation lever is pulled up, the operation plate is rotationally displaced in the direction of locking the lock bin in the shallow first locking recess, and in this state, The locking pin is pushed inward against the biasing force of the spring and is held in a state where it is separated from the locking groove of the wheel, so that both wheels are maintained in a rotatable state and in this state. Since the locking member of the pivot shaft locking means is not actuated by the cam portion of the operation plate, the main body is maintained in an unlocked state in which it can freely pivot around the pivot shaft.

In other words, it is maintained in an all-free state, and the first
The operation plate and the operation lever are held in this all-free state by the engagement of the locking recess and the lock bin.

When the operating lever is pushed down from this state, the operating plate rotates around the axle, and as a result, the lock pin disengages from the first engagement recess, slides through the guide elongated hole, and the lock pin moves to the second engagement II: recess. The operation plate and the operation lever are held for 1 hour, but the second locking recess is
Like the locking recess, it is formed shallowly, so the lock pin is maintained out of the locking groove of the wheel, thereby allowing the wheel to rotate freely.

However, at this time, since the operating plate rotates as described above, the locking member is operated by the cam portion in a direction to stop the rotation of the rotation axis 101, and as a result, the main body and the rotation axis are locked with each other.

Furthermore, when the operating lever is pushed down from this state, the operating plate rotates [11] around the axle, and the lock pin moves to the second position.
It is detached from the engaging recess of 1 and is engaged with the deep third engaging recess, and the operating plate and operating lever are held by 1"4, but
At this time, both ends of the lock pin are locked in the grooves of both wheels, and the wheels are locked, and the lock member is held in an activated state by the cam part of the operation plate.
The locked state between the main body and the pivot shaft is maintained.

That is, both the main body and the wheels are maintained in a locked state.

From this state, by sequentially pulling up the operating lever and rotating the operating plate in the opposite direction to that described above, the Tp wheel is first unlocked, and then the main body and the pivot shaft are unlocked.

(Example) The present invention will be described in detail below with reference to illustrated embodiments.

1 to 10 show a first embodiment, and FIGS. 11 to 17 show a second embodiment, and the first embodiment will be explained first.

As shown in Figures 1 to 3, two wheels 1 with the same diameter
．． 1' has a large number of interlocking semicircular arc-shaped locking grooves 2 on the inner circumferential surface of the rolling wheel portion, and a shaft hole 3 at the center of the inner surface. The boss portion 4 is recessed.

These two wheels 1, 1° constitute running wheels by fitting each end of the axle 5 into the shaft hole 3 thereof.

The main body 8 in the center of FIG. 2 is suspended between an outer wall 6a that covers the road half of the two wheels 1.1', and an intermediate part in the width direction of the inner surface of the outer wall 6a between the two wheels 1.1'. Section 46
eb and is formed integrally with the lower opening.

(-Note: At the center position, which is the lower end of the picture wall 6b, there is a shaft hole 7.
is located in the boss portion 7a and extends through it in the width direction, that is, in the left-right direction. The central part of the axle 5 in the longitudinal direction is rotatably supported so that both wheels 1. l
° is rotatable with respect to the main body 6 together with the axle 5.

Further, the main body 6 has a shaft hole 8 vertically provided with a bottom on its upper surface near the side, and an opening [1 projecting edge 9 of the shaft hole 8].
is integrally provided so as to protrude upward, so the opening flange 8 is 1i! Two stocks 9a are arranged vertically so that the diameter can be adjusted, and a male screw portion 9b is carved on the outer periphery of the stocks 9a.

The pivot shaft lO to be attached to furniture, etc. has its lower and upper ends formed into small-diameter parts 10a, 10a, and its intermediate part formed into a large-diameter part 10b; 10a with the collar 11.12 externally mounted, its lower half is inserted into the shaft hole B of the main body 6 in E, with the steel pole 13 interposed at the bottom, and the shaft hole 8 is inserted into the shaft hole B. By fitting a bearing 14 such as a bearing into the two parts and screwing a cap 15 onto the opening flange 9, the E bearing 14 is fixed, and thereby the pivot axis IO is prevented from detaching in the axial direction. In this state, it is rotatably supported on the main body ε.

The arms 11a, Ila, +2a, 12a protruding in the radial direction of both the collars 11.12 are fitted into the grooves 8a, 8a vertically provided on the inner circumferential surface of the shaft hole 8, so that the circumference can be improved. The rotation in the direction is bright, iL:,.

Next, the pivot shaft locking means A will be described in detail.

The pivot from the upper collar 11! 0 to the upper part of the large diameter part lOb, and from the lower collar 12 to the lower part of the large diameter part 10b.
Each one-way spring clutch IEla, 18b is wound with an opposite winding direction as 6, and each one-way spring clutch 18a.

The arm portions 18c and LED protruding from the outer end of leb are fixed by engagement with the groove portion 8a, and the arm portions lee and If! f communicates with the shaft hole 8 and is divided into sections vj! e
The arm portions 16e and 16F are fitted into one-way spring clutch arm receivers 17 and 18 which protrude into the guide hole IElc penetrating through the guide hole IElc and are fitted into the guide hole 6c so as to be slidable in the left and right direction. As shown in FIGS. 4(a) and 4(b), the arm receivers 17 and 18 allow movement in the left and right directions.

Furthermore, the wheel lock means date is formed as follows.

As shown in FIGS. 2, 3, and 5, a lock pin 20 is inserted into a through hole 19 extending in the radial direction in the partition wall 6b of the main body 6 in parallel with the axle shaft 5. , and is penetrated so as to be able to freely slide in the radial direction, and the bottom portion 19a of the through hole 19 and the lock pin 20
The lock pin 20 is biased in the outer circumferential direction by an IF and compression spring 21 which is installed in the through hole 19 with its end supported at the end thereof.
, 1'' are configured to be removably locked in the locking grooves 2 .

The pivot shaft locking means A and the wheel locking means B formed as described above are operated by an operating means C, and the means C will be explained below.

': As shown in Figures 51 to WS3, a pair of left and right operation plates 22 and 22 each having a generally fan-shaped front face, and both operation plates 2
2.22 has an operating lever 24 fixed at one side end thereof by a pin 23 and extending outward, and both operating plates 22.22 are connected to the partition wall 6b and each Wheel 1.1'
In between, shaft holes 25, 25, which are located in the main part of the sector shape and are penetrated so as to be rotatable about the axle 5, are provided.
The axle 5 passes through the axle 5, and is thereby supported on the axle 5, and the operating lever 24 extends outward from a window hole 26 that is long in the circumferential direction of the outer wall ea of the main body 6.

Both operation plates 22.22 are located approximately in the middle in the circumferential direction thereof, and are located on an imaginary circumferential line centered on the shaft hole 25.25. A first locking recess 28 and a second locking recess for removably locking the lock bin 2o are provided on the outer peripheral edge of the lock pin guide long hole 27.27. 29 and 3rd
The locking recesses 3o are arranged successively at required intervals in the circumferential direction.

Here, both the first and second locking recesses 28 and 29 are provided with a shallow depth in the radial direction, and the lock bin 20 is locked in both the locking recesses 28 and 29. So,
The lock bin 20 is held in a position where it is not locked with the locking grooves 2 of the wheels 1 and 1'', as shown in FIG. 5(a), against the spring force of the compression spring 21.

On the other hand, the third locking recess 30 has a deep radial depth, and when the lock pin 20 is engaged with the locking recess 30, the lock pin 20 is As shown in Figure 5 (b), the engagement groove 2 of the wheel 1.1'
・・・・・・・The ship was moored and wheels 1.1” were lowered to 2.

Also, Chapter E and Chapter 1. 2nd, 3rd, 6th section and 4th section 28.29
．． 30, the lock bin 20 is locked to these by spring force, so that the operation plates 22, 22 and the operation lever 24
It also plays the role of holding the objects at their respective positions.

Furthermore, the pair of operation plates 22.22 have cam portions 31 at their circumferential ends facing both left and right ends of the arm receiver 17.18, as shown in FIGS. As shown in FIG. 2, the symmetrical ends 17a and 18a of the arm receivers 17 and 18 are in contact with the inclined cam surfaces 31a and 31b, respectively. being touched.

1: The distance between the two cam surfaces 31a and 31b is gradually widened from the upper end toward the lower end, so that the above-described first locking recess 28 of the operation plate 22 and the lock pin 20
In the locked state, as shown in Figure 1O (a),
Since the arm receivers 17 and 18 are located at the upper ends of the two cam surfaces 31a and 31b where the distance between them is the narrowest, the arm receivers 17 and 18
．． 18 are pressed and held in opposite directions, and arm portions 16e and 18f
is a one-way spring clutch 16a.

The one-way spring clutch lea is moved in the opposite direction to the @ direction of 16b by its own spring force,
16b is expanded in diameter and held without wrapping around the outer periphery of the pivot shaft 10, thereby allowing the pivot shaft 10 to rotate in either left or right direction.

Also, by rotating the operation plate 22.22, the second locking recess 29. Or third locking recess 30 and row, cupin 20
When the one-way spring clutches tea and 18b are locked, the arm receivers 17 and 18 are located at the lower part of the cam surfaces 31a and 31b with a wide gap between them, so as shown in FIG. 10(b), the one-way spring clutches tea and 18b Due to the force in the winding direction, both arm portions IEle, 16F move in opposite directions, thereby causing both arm receivers 17.18 to move in a symmetrical direction, and thus one-way spring clutch lea, 18b.
is wrapped around the outer periphery of the pivot shaft 10.

For this purpose, corresponding to the left rotation and right rotation of the rotation axis 10,
The one-way spring clutch 16a in the first part and the one-way spring clutch 18b in the lower part each generate a force in the winding direction, so that the turning rotation lO is locked without being rotated in either the left or right direction.

Here, in order for the arm receivers 17, 18 to be smoothly operated by the cam portion 31, their symmetrical ends 17a, 18a are formed into inclined surfaces corresponding to the cam surfaces 31a, 31b.

FIG. 6 shows a free state in which the operating lever 24 is pulled up to the position (■) in FIG. By pressing down and rotating the wheel to the position marked ■ in the diagram, press the wheel 1. lo
is free to rotate, but the pivot shaft 10 is locked. In FIG. 8, the operating lever 24 is pushed down to the position of FIG. l
The state in which both O and O are locked is clearly shown.

Further, in order to make it easier to confirm the positions of the above-mentioned ■, ■, ■ from the outside, it is preferable to display the symbols ■, ■ in the vicinity of the window hole 26 in the main body 6.

Next, a second example will be explained in detail.

Next, the second embodiment shown in FIGS. 11 to 17 will be explained. In this case, the pivot shaft locking means ^ and the wheel locking means B are combined and integrated. A serration 32 is carved in the lower outer periphery of the shaft 10 at a portion located in the shaft hole 8 of the main body 6, and is opened on the serration 32 side, and penetrates through the partition wall 5bt in the main body θ and has a radius. A locking member 18 is installed inside the guide hole 6C, which is long in the direction, so as to be slidable in the radial direction.

The locking member 16 has a surface facing the selection 32 formed into an arcuate surface having a curvature approximately equal to the outer circumferential curvature of the rotation axis lO, and the arcuate surface has a plurality of The southern legs are arranged vertically.

From the back of the locking member 16, there are two guide rods 16.
h, 113h are protruded in parallel, and both guide rods 16
h.

+6h has long holes 18i, 18i facing each other in the front and back direction.
is provided therethrough, and a lock pin 20 is passed through this so as to be able to freely slide in the front-rear direction (radial direction).

A compression spring 21 supported by the bottom of the guide hole 6C and the end of the lock pin 20 is installed in the guide hole 16c, and the compression spring 21 causes the row 2 pin 20 and the lock member 16 to move in the outer radial direction. As before, the pair of biased operation plates 22.22 have a guide elongated hole 27, and a first shallow guide hole 27 is provided on the side thereof. Second both locking recesses 28.
29 and a third locking main gate portion 30 having a depth of 1 depth are formed, but in this embodiment, these are connected to the lock pin 2.
0 is provided at one end of the operation panel 22.22.

Furthermore, a pair of pressing protrusions 18j, 18j are symmetrically provided on the locking member 16 from both left and right sides thereof, and protrude toward each wheel 1.1' from the guide hole 6C.

Further, in this embodiment, the cam portion 31 of the operation plate 22.22 is formed by protruding the peripheral surface of one side end of both operation plates 22.22 in the outer radial direction. By rotating the pair of operating plates 22 and 22, the projection 1
8j and 18j are pressed in the outer radial direction by the cam portion 31, thereby the locking member 1e is pressed and moved toward the rotation axis IO side, and its southern part 16g engages with the serrations 32,
The pivot axis lO is designed to be locked with the main body 8.

Here, the cam portion 31 is in a state where the locking pin 20 is locked with the locking recess 28 of the pair of operation plates 22.22.
In other words, the lock pin 20 is connected to the locking groove 2 of the wheel 1.1'.
. . . When the locking member 16 is not locked, the locking member 16
is not pushed so that the locking member 16 and the pivot shaft lO are kept free, and when the second locking recess 23 and the third locking recess 30 are locked with the lock pin 20, The position is set in advance so that the locking member 16 is pushed as described above.

Here, the lock pin 20 is connected to the second locking recess 29,
When locked in the third locking recess 30, both ends of the lock pin 20 are locked to the wheel 1.1'.
. . . is the same as in the first embodiment described above.

Further, in this embodiment: As clearly shown in FIG. 12, the pivot shaft 10 is directly fitted into the shaft hole 8 of the main body 6 so as not to fluctuate in the radial direction, and its lower end and the bottom of the shaft hole 8 are directly fitted. A steel pole 13 is interposed between the shaft hole 8 and a bearing 14 supported by a cap 15 in the vicinity of the opening of the shaft hole 8. This prevents the pivot shaft lO from being removed from the main body 6 in the axial direction. It is rotatably supported on a shaft in a locked state, and the rest is as follows:
This is the same as the case according to the first embodiment described above.

Note that FIGS. 13, 14, 15, and 16 in the second embodiment correspond to FIGS. 6 and 7, respectively, in the first embodiment described above.
FIG. 8 shows a state corresponding to FIG. 9, FIG.

(Effects of the Invention) Since the present invention is configured as explained below,
An all-free state in which the wheels and the pivot shaft are freely rotatable, a main body rotation lock state in which only the pivot shaft is independently locked to the main body, and a simultaneous lock state in which the main body rotation lock state and the wheel rotation lock state are obtained, respectively. By locking the wheels and pivot.

Not only can furniture be safely and reliably stopped at a desired position, but by locking only the pivot axis, the furniture can be moved in a straight line while the main unit is prevented from moving. It is possible to take things in and out of a limited space, such as, extremely smoothly and without damage.

In addition, the uninvented casters can be used alone without combining various parts like conventional casters, and furthermore, depending on the position of the operating lever, the all-free state, the main body rotation lock state, and the main body wheel rotation plate can be adjusted. Since each locked state can be determined at a glance, the operability can be improved compared to the conventional one.

[Brief explanation of drawings]

1 to 10 show the first caster according to the present invention.
Fig. 1 is a perspective view with one wheel removed, Fig. 2 is an exploded perspective view of the whole, and Fig. 3 is a -t
rFJ9J missing side view, Figure 4 (A) 00 is a front explanatory view of the rotation axis locking means in the non-locked state and the rotation axis locked state, and Figures 5 (A) and (B) are the wheel locking means. Fig. 6 is a side view of the all-free state;
The figure is a side explanatory view of the pivot axis locked state, Figure 8 is the pivot axis,
A side explanatory view of the wheel inner opening in the closed state, Figure 9 is the same as Figures 6 and 7.
Figure 8 is an explanatory side view showing the position of the operating lever in each state shown in Figure 8, and Figures 10 (a) and 10 (b) are in the non-locking state of the rotating shaft showing the relationship between the rotating shaft locking member and the cam portion of the operating plate. and each plan view of the pivot axis locked state, Figures 11 to 17.
The figures show the second embodiment of the present invention. FIG. 11 is an overall exploded perspective view, FIG. 12 is a partially cutaway side view, FIG. 13 is a side explanatory view in an all-free state, and FIG. Fig. 14 is a side explanatory view of the rotating shaft in the locked state, Fig. 15 is a side explanatory view of the rotating shaft and wheels in the locked state, Fig. 16 is Fig. 13, @
14 and 15 are side views showing the position of the operating lever in each state, and FIGS. 17(a) and 17(b) show the non-meshing state and the meshing state of the pivot shaft and the locking member in the pivot shaft locking means. FIG. 1.1°... Wheel 2... Engagement + h groove 5... Axle 6... Main body 6a... Outer wall 6h... Compartment wall lO... Rotating shaft 1B... Lock member 20... Lo, Kubin 21... Spring 22, 22... Pair of operations Plate 24...Operating lever 26...Window hole 27...Kite elongated hole 28...First locking recess 29...No. 2nd locking recess 30...Third locking +h recess 31...Cam part^...Rotating axis locking means B...Wheel locking means C.・・・・・・Operation means representative Patent attorney Sai If # Figure 3 Figure Figure Figure Figure (A) (0) Figure 3 Figure Figure 2 Figure 0 Figure 0 (A) ts to Figure C0 ) Figure 1 Figure 12 Figure 7 Figure 7 (a) Figure 7 (o) Figure 5 Figure b Figure 3 Figure 4

Claims (1)

[Claims] A pair of left and right wheels with locking grooves formed on the inner circumferential surface and fixed to both ends of the axle, and an intermediate portion of the axle that hangs down between the two wheels from an outer wall covering the upper side of the two wheels and is rotatable. A caster consisting of a main body that has a partition wall supported by the main body and is open downward, and a pivot shaft that is rotatably installed on one side of the main body, and a caster that is horizontally mounted on the partition wall of the main body. installed through it and biased in the radial direction by a spring,
a wheel locking means having a radially slidable locking pin for engaging and disengaging from the locking grooves of both wheels; and a wheel locking means disposed within one side of the main body and abutting on an outer peripheral portion of the pivot shaft. a pivot shaft locking means having a locking member capable of freely restraining the rotation of the pivot shaft; and a window hole located between the partition wall of the main body and both wheels and having a protruding operating lever opened in the circumferential direction of the outer wall of the main body. A pair of operation plates are attached to the axle so as to be able to rotate circumferentially around the axle while extending outward from the wheel. A first locking recess and a second locking recess having a shallow radial depth, in which the operating plate is held in a state in which it is released from the locking groove portion in a detachable manner, and the operating plate is held in that state; The lock pin can be locked in the locking groove of the wheel,
A third locking recess with a deep radial depth, in which the operating plate is held in the locked state so that it can be freely locked and detached, is connected to the lock pin at a required interval in the circumferential direction. states in which the lock pin is connected to the side of the guide elongated hole, and the lock pin is locked with both the second and third locking recesses by rotation of both operation plates in the circumferential direction by the operation lever. A caster characterized in that the caster is equipped with an operating means formed with a cam portion for operating the locking member in a direction that brings the pivot shaft into a restrained state.