JPH0725071Y2 - Caster locking device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device for a caster to be attached to a leg of furniture such as a table and a chair for offices and homes.

[0002]

2. Description of the Related Art Conventionally, as casters as described above,
A roller is rotatably attached to the caster body by a horizontal shaft, and a lower end portion of the vertical axis of the attachment shaft is rotatably connected to the caster body around the axis, and the attachment shaft is attached to a leg portion of a fixture such as a table. It is generally used to hold the caster mounting member such as a floor leg provided and to position the caster body below the mounting member.

Further, as a lock device for this caster, a pressing body of an operating mechanism is arranged at a position apart from the mounting shaft on the caster body, and the pressing body is pushed down to be supported by the caster body. There is a method in which the locking member is locked to the roller to keep it in the locked state, and the pressing member is pushed down again to release the locking member from the roller, thereby releasing the locked state.

Then, in a free state where the lock of the roller is released, a fixture such as a table is moved to a use position on the floor surface using a caster, and the roller is locked at this position so that the fixture does not move unintentionally. I am trying.

[0005]

However, in the conventional caster locking device described above, when the fixture such as the table is moved to the use position, the pressing body is attached depending on the direction of the caster body with respect to the caster attaching member. It becomes below the member, or it comes close to the mounting member, making it impossible to push down the pressing body,
It becomes difficult, and in order to eliminate these, if you change the direction of the caster body and the roller to a position away from the mounting member that is easy to push down the pressing body,
There was a problem that the furniture was displaced from the use position.

This invention solves the above-mentioned problems,
To provide a caster locking device that can always easily push down the pressing body of the operating mechanism with a foot regardless of the orientation of the roller and the caster body and does not require the troublesome work of changing the orientation of the caster body. The purpose is.

[0007]

According to the present invention, a roller is attached to a caster body by a horizontal shaft, and a vertical attachment shaft is rotatably connected to the caster body about an axis, and the attachment shaft is attached to a leg of a table. In a lock device for a caster, which is held by a floor leg provided on a bottom portion of the floor leg, and the caster body is positioned below a rear end of the floor leg, an operating shaft biased upward by a return spring is attached to the mounting shaft. It is inserted so that it can be raised and lowered, and it moves forward and backward in the horizontal direction by raising and lowering the engaging element provided at the lower end of this operation shaft, and inside the flange of the roller .
A locking member that releasably locks in a locking groove formed on the peripheral surface is constantly urged toward the engaging element side by a pressing spring to be supported by the caster body and fixed on the rear end of the floor leg. a box-like body, Rutotomoni engaged vertically movable engaging the outer box-shaped pressing member facing the upper end of the operation shaft inserted into the box-like body, before
A cam groove is formed on the outer wall surface of the box-shaped body.
A horizontal straight groove is formed on the inner wall surface of the pressing body.
The sphere is movably accommodated in the cam groove and the linear groove, and the operating shaft is kept in the roller lock state in which these are lowered by pressing down the pressing body, and by pressing down the pressing body again. An operating mechanism for releasing the locked state by raising and returning the pressing body and the operating shaft is provided.

[0008]

The caster locking device according to the present invention has a mounting shaft that is rotatably connected to the caster body about an axis.
Since the operation shaft is inserted so as to be able to move up and down, the pressing body of the operation mechanism can be positioned on the floor leg of the table holding the attachment shaft.

Therefore, regardless of the orientation of the roller and the caster body with respect to the floor leg ,
It is always easy to push down the pressing body by stepping on it with the foot to put the roller in the locked state and the unlocked state. In addition, it is not necessary to change the direction of the caster body and the roller at the use position of the table, etc.By changing the direction, the furniture such as the table does not shift from the use position, and the roller is locked at the accurate use position, You can prevent the furniture from moving unintentionally.

Further , the outer wall of the box-shaped body fixed on the floor leg
Cam groove on the surface and the inner wall of the pressing inner wall facing the cam groove
A horizontal straight groove is formed on the surface, and these cam grooves and straight
Since the steel ball is movably accommodated across the groove,
It is extremely smooth to maintain the descent and to return to the ascent.
Is possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In each of FIGS. 1 to 4, reference numeral 1 denotes a caster main body, and the main body 1 has a horizontal axis 2 to the left,
The right roller 3 is rotatably mounted, and the lower end of a vertical mounting shaft 4 is fitted rotatably around the shaft. A large diameter portion 4a located above the caster body 1 is provided on the mounting shaft 4, and a screw portion 4b is formed above the large diameter portion 4a.

The lock device 26, which is provided on the caster 5 constructed as described above and prevents the rotation of the roller 3, is
It is configured as follows. An operating shaft 6 is slidably inserted into the mounting shaft 4 in the axial direction, and an inverted conical engagement element 7 is fixed to the lower end of the operating shaft 6 by screw fitting. A spring bearing plate 6a is formed on a portion of the operating shaft 6 protruding above the mounting shaft 4, and a coil loosely fitted to the operating shaft 6 is provided between the lower surface of the spring bearing plate 6a and the upper end surface of the mounting shaft 4. A return spring 8 made of a spring is interposed, and the return spring 8 biases the operation shaft 6 upward, and the upper end surface of the engagement element 7 is in contact with the lower surface of the outer peripheral side of the operation shaft 6 of the caster body 1.

An upper coil spring 9, which has a stronger spring force than the return spring 8, is loosely fitted above the spring receiving plate 6a of the operating shaft 6,
A lift plate 10 is supported on the upper coil spring 9. The elevating plate 10 is slidably fitted in the operating shaft 6 in the axial direction thereof, and is supported by a retaining member 6 b provided at the upper end of the operating shaft 6 by expanding the diameter of the operating shaft 6.

Below the horizontal axis 2 of the caster body 1, the sliding portion 11a of the locking member 11 is fitted and supported slidably in the horizontal direction orthogonal to the horizontal axis 2, and the sliding portion 11a has a cross section. It is formed in a rectangular shape, and the terminal inclined surface 11b of the sliding portion 11a faces the outer peripheral surface of the engagement element 7.

The locking portion 11c of the locking member 11 is housed in the window hole 1a formed in the caster body 1, and the locking portion 11 is formed.
c is fixed to the tip of the sliding portion 11a, and the locking portion 11c is urged toward the engagement element 7 side by the push spring 12 housed in the window hole 1a, so that the locking element 11c is moved to the side wall of the window hole 1a on the engagement element 7 side. Abutted. Further, left and right locking pieces 11d are formed to project from both ends of the locking portion 11c in parallel with the horizontal axis 2.

The left and right rollers 3 are formed with annularly projecting flange portions 3a on their respective outer peripheral surfaces, and the inner peripheral surfaces of these flange portions 3a are engaged and disengaged by fitting the locking pieces 11d. A locking groove 3b that can be locked is formed over the entire circumference in the shape of a tooth groove of a gear. And
The rolling surfaces of the left and right rollers 3 are covered with a cover 1a formed integrally with the caster body 1.

An operating mechanism 13 for moving the operating shaft 6 up and down.
Is provided with a box-shaped body 14 having an open upper surface, and an outer-box-shaped pressing body 15 fitted to the outer periphery of the box-shaped body 14 so as to be able to move up and down. In the box-shaped body 14, a locking projection 14b is projected below the central portion of each side wall 14a, and a guide ridge 14c is formed on the outer surface of the end portion of each side wall 14a in the vertical direction. A hole 14e and a screw hole 14f having a diameter through which the mounting shaft 4, the spring receiving plate 6a of the operating shaft 6, the elevating plate 10 and the like can pass are formed in the portion.

As shown in FIG. 5, the cam groove 1 is provided between the guide ridges 14c on the outer surfaces of the side walls 14a of the box-shaped body 14 which face each other.
6 is formed. These cam grooves 16 are formed in an endless shape of a substantially parallelogram, one end is high and the other end is inclined low, and a locking step portion 16a is formed substantially at the center of the lower side portion.

In the pressing body 15, guide grooves 15b are formed on the inner surfaces of the end portions of the respective side walls 15a along the vertical direction, and a spring receiving cylinder 15d is formed at the center of the lower surface of an upper wall 15c whose upper surface is formed in a protruding arc shape. And a horizontal linear groove 17 is formed on the inner surface of the side wall 14a corresponding to the side wall 14a on which the cam groove 16 of the box-shaped body 14 is formed. The linear groove 17 is a vertical groove that connects the upper and lower sides of the cam groove 16 continuously. The length at which the side and both ends are connected is set to be the same as the groove width of the cam groove 16.

The upper end of the large-diameter coil spring 18 is fitted on the outer peripheral surface of the spring receiving cylinder 15d, the guide groove 15b is engaged with the guide protrusion 14c, and the cam groove 16 and the linear groove 17 are straddled. A steel ball 19 is fitted and the pressing body 15 is fitted on the outer periphery of the box-shaped body 14. The large-diameter coil spring 18
Has its lower end supported on the outer peripheral portion of the hole 14e of the bottom wall 14d provided in the box-shaped body 14, and the pressing body 15 is urged above the box-shaped body 14 by the large-diameter coil spring 18. 15 b is slidably engaged with the guide protrusion 14 c, and the steel ball 19 is movably accommodated across the interlocking groove 17 and the cam groove 16, whereby the operation mechanism 13 is configured. There is. In addition, in the pressing body 15, the small protrusion 15 e protruding from the lower end of the guide groove 15 b has the guide protrusion 14 of the box-shaped body 14.
By being supported by a small protrusion 14g protruding from the upper end of c, the box-shaped body 14 is prevented from coming out above.

The caster 5 and the lock device 26 configured as described above are provided on the lower ends of the left and right leg portions 24 of the table 21 and extend in the front-rear direction. The left and right floor legs (caster mounting member) 20. It is attached to the rear end 20a.
A recess 20c is formed in the lower wall 20b of the rear end 20a of the floor leg 20.
And a large screw hole 20d is formed in the center of the recess 20c.
A small hole 20e and a locking hole 20f are formed on the outer peripheral side thereof.

The box-shaped body 14 of the operating mechanism 13 has a lower portion housed from above in a recess 20c formed in the lower wall 20b of the floor leg 20, and the locking projection 14 protruding downward from the box-shaped body 14.
b is elastically deformed and fitted into the locking hole 20f of the recess 20c, and the locking claw 14h provided on the locking projection 14b is recessed in the recess 20c.
The box-shaped body is locked by the lower surface of the box-shaped body 14 and the set screw 27 inserted from below into the small hole 20f of the recess 20c is fastened to the screw hole 14f formed in the bottom wall 14d of the box-shaped body 14. 14 is positioned and fixed to the rear end portion 20a of the floor leg 20.

Further, the mounting shaft 4 connected to the caster body 1 has a recess 20 formed in the lower wall 20b of the floor leg 20.
The upper part of the operation shaft 6 which is tightened in the large screw hole 20d of c and protrudes above the mounting shaft 4, the spring bearing plate 6a, the upper coil spring 9,
The return spring 8 and the elevating plate 10 are loosely inserted into the large-diameter coil spring 18 housed inside the box-shaped body 14 and the pressing body 15 of the operating mechanism 13, and the elevating plate 10 is pushed.
5 is supported on the lower surface of the spring receiving cylinder 15d provided on the inner surface of the upper wall 15c.

As described above, the casters 5 and the lock device 26 are mounted on the rear end portions 20a of the left and right floor surface legs 20, respectively, and the heights of the front end portions of the left and right floor surface legs 20 can be adjusted. Each front caster 22 is attached, and the front end portions of the left and right floor legs 20 are fixed to the lower end portions of the left and right pedestals 23 to form the leg portions 24, and the leg portions 24 are erected at the upper end portions thereof. A top plate 25 is pivotably supported.

A portion of the floor leg 20 behind the pedestal 23 is covered with a leg cover 29, and the leg cover 29 is detachably fixed to the floor leg 20 and is formed at a rear end portion of the leg cover 29. The pressing body 1 of the operating mechanism 13 is provided in the cover hole 29a.
5 is loosely fitted, and the upper portion of the pressing body 15 is projected onto the leg cover 29.

Next, the use of the caster 5 and the lock device 26 according to this embodiment will be described. Table 2
1 is folded up with the top plate 25 raised, and in a state where the pressing body 15 of the lock device 26 is raised and the roller 3 is free, while rolling the roller 3 on the floor surface, the table 21 is moved to a required use position. To move.

At the use position of the table 21, the lock device 2
When the large-diameter coil spring 18 is pressed down while being compressed by, for example, stepping on the pressing body 15 of 6, the lifting plate 10 fitted on the upper end of the operating shaft 6 is moved by the lower surface of the spring receiving cylinder 15d of the pressing body 15 to the upper coil. The spring bearing plate 6a of the operating shaft 6 is pushed downward via the spring 9, and the operating shaft 6 is lowered while compressing the return spring 8.

When the operating shaft 6 descends, the inverted conical surface of the engaging element 7 provided at the lower end of the operating shaft 6 pushes the terminal inclined surface 11b of the sliding portion 11a provided on the engaging member 11 to cause the engaging member 11 to move.
Is pushed forward while compressing the push spring 12. By this forward movement, the left provided on the locking portion 11c of the locking member 11,
The right locking piece 11d is fitted into one of the locking concave grooves 3b formed in the flange portions 3a of the left and right rollers 3, respectively, and the roller 3 is locked by the locking piece 11d to prevent the rotation thereof. Lock it.

Simultaneously with the above-mentioned operation, the linear groove 17 provided in the pressing body 15 is lowered by pushing down the pressing body 15. For this reason, the steel ball 19 that has engaged with the upper side portion of the cam groove 16 of the box-shaped body 14 fixed to the floor leg 20 and the straight groove 17 is lowered by the straight groove 17, so that the straight groove 17 and the cam groove 16 are moved. The locking step 15 formed on the lower side of the cam groove 16 guided by
to a.

At this time, when the pushing of the pressing body 15 is released, the restoring force of the large-diameter coil spring 18 causes the pressing body 15 to move.
Is urged upward, but the steel ball 19 is locked by the locking stepped portion 15a of the cam groove 16 on the upper surface of the locking stepped portion 16a and does not return upward, and the operating shaft 6 is also lowered. Holding Therefore, the roller 3 maintains the locked state by the locking member 11 described above. In this locked state, the table 21
Is used by tilting the top plate 25 horizontally. In this state, the upper coil spring 9 interposed between the spring receiving plate 6a of the operating shaft 6 and the elevating plate 10 is not compressed.

[0031] In the usage state, the folding causing the top plate 25, depressing the pressing member 15 again descends the pressing member 15 elevating plate 10 compresses the upper coil spring 9, the steel ball 19 is engaging stage When the pressing body 15 is released from the portion 16 a and the pressing of the pressing body 15 is released, the large-diameter coil spring 18 extends and the pressing body 1 is released.
5 rises and returns. At the same time, the upper coil spring 9 and the return spring 8 expand, and the operating shaft 6 rises and returns. When the operating shaft 6 rises, the engaging element 7 also rises, so the locking member 1
1, the push spring 12 expands to return and return, and the locking member 11 separates from the roller 3 to release these locks, and the roller 3 becomes free.

After the roller 3 becomes free, the table 21 is returned from the use position to the storage position by the caster 5 and the front caster 22 that is not locked, and the roller 3 is locked again if necessary.

In this embodiment, the roller 3 is locked and unlocked for the left and right casters 26, respectively, and the top plate 25 of the table 21 can be raised and lowered at an appropriate time. .

Further, in this embodiment, a small disc may be screwed to the upper end surface of the operating shaft 6 to prevent the lift plate 10 from coming off. In order to facilitate the assembly work, the operating mechanism 1
The pressing body 15 of No. 3 may be divided in two in the vertical direction and fixed by appropriate means.

[0035]

As described above, the caster lock device according to the present invention is connected to the caster body,
An operating shaft urged upward by a return spring is inserted into a mounting shaft for holding the main body below the floor leg provided on the leg of the table so as to be able to move up and down, and an engaging element provided at the lower end of the operating shaft. When the roller is moved up and down, it moves back and forth in the horizontal direction, and a locking member that locks in a locking groove formed on the inner peripheral surface of the flange portion of the roller in a disengageable manner is always attached to the engaging element side by a pressing spring.
A box-shaped body that is supported by the caster body and is fixed on the rear end of the floor leg is pressed in the shape of an outer box facing the upper end of the operating shaft inserted into the box-shaped body. body liftably to engage <br/> the Rutotomoni, forming a cam groove on an outer wall surface of the box-shaped body
However, on the inner wall surface of the pressing body that corresponds to this cam groove,
A linear groove is formed, and a steel ball is movably accommodated across the cam groove and the linear groove, and the operating shaft is held together with the pressing body by pushing down the pressing body to keep them in a roller lock state, Since the pressing body and the operating shaft are raised and restored by pushing down the pressing body again, and the operating mechanism for releasing the locked state is provided, the following effects can be obtained.

That is, in the caster lock device according to the present invention, since the operating shaft is vertically movably inserted into the mounting shaft that is rotatably connected to the caster body about the shaft, the pressing member of the operating mechanism is not attached to the mounting shaft. Can be positioned on the floor leg of the table holding. Therefore, regardless of the orientation of the roller and the caster body relative to the floor leg , the pressing body is pushed down by a foot or the like to bring the roller into a locked state and an unlocked state. Always easy to do.

Further, it is not necessary to change the direction of the caster body and the roller at the use position of the table, etc. By changing the direction, the furniture such as the table does not shift from the use position, and the roller is locked at the correct use position. The furniture can be prevented from moving unintentionally.

Also, the outer wall of the box-like body fixed on the floor leg
Cam groove on the surface and the inner wall of the pressing inner wall facing the cam groove
A horizontal straight groove is formed on the surface, and these cam grooves and straight
Since the steel ball is movably accommodated across the groove,
It is extremely smooth to maintain the descent and to return to the ascent.
Is possible.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a table to which a caster with a locking device is attached according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a lock device for a caster according to an embodiment of the present invention.

FIG. 3 is a partially cutaway front view of the caster locking device shown in FIG.

FIG. 4 is an exploded perspective view of the caster lock device shown in FIG.

5 is an operation explanatory view of an operating mechanism provided in the caster lock device of FIG. 2;

[Explanation of symbols]

 1 Caster Main Body 2 Horizontal Shaft 3 Roller 3a Flange Part 3b Locking Groove 4 Mounting Shaft 5 Caster 6 Operating Axis 6a Spring Receiving Plate 7 Engager 8 Return Spring 9 Upper Coil Spring 10 Lifting Plate 11 Locking Member 11a Sliding Part 11c Locking part 11d Locking piece 12 Push spring 13 Operating mechanism 14 Box-shaped body 15 Pressing body 15d Spring receiving cylinder 16 Cam groove 17 Straight groove 18 Large diameter coil spring 19 Steel ball 20 Floor leg (caster mounting member) 20b Lower wall 21 table (furniture) 23 pedestal 24 leg portion 25 top plate 26 locking device 29 leg cover

Claims (1)

[Scope of utility model registration request] 1. A roller is attached to a caster body by a horizontal axis, and a vertical axis is attached to the caster body so as to be rotatable around the axis. The attachment axis is attached to a leg portion of a table.
In a caster lock device that is held by a provided floor leg and positions the caster body below the rear end of the floor leg, the operating shaft biased upward by a return spring to the mounting shaft can be moved up and down. The engaging member provided at the lower end of the operating shaft to advance and retreat in the horizontal direction by raising and lowering the engaging element, and to engage and disengage the engaging member that engages and disengages in the engaging groove formed in the inner peripheral surface of the flange portion of the roller. Always engaged by a push spring
A box-shaped body that is urged toward the child side to be supported by the caster body and fixed on the rear end of the floor leg is provided with an outer surface facing the upper end of the operation shaft inserted into the box-shaped body. box-shaped Rutotomoni the pressing body was vertically movably engaged, the cam groove on an outer wall surface of the box-shaped body
Is formed on the inner wall surface of the pressing body that corresponds to this cam groove.
A flat linear groove is formed, a steel ball is movably accommodated across the cam groove and the linear groove, and the operating shaft is lowered together with the pressing body by pushing down the pressing body into a roller lock state. A lock device for a caster, comprising: an operating mechanism that holds the pressing body and the operating shaft upward by returning the pressing body by pushing down again, and releases the locked state.