JPH0652584U - Caster locking device - Google Patents

Abstract

(57) [Summary] [Structure] The mounting shaft 4 is rotatably connected to the caster body 1 to which the roller 3 is mounted by means of the horizontal shaft 2.
Is a lock device for the caster 5 that holds the bottom wall 20b of the floor leg 20 of the table 21, and the operation shaft 6 that is biased upward by the return spring 8 is inserted into the mounting shaft 4, and the lower wall 20
The box-shaped body 14 of the operation mechanism 13 is fixed on b.
The operating body 6 is lowered by pushing down the pressing body 15 engaged with the roller 3, and the roller 3 is locked by the locking member 11 supported by the caster body 1 via the engaging element 7 fixed to the lower end of the operating shaft 6. The locked state is maintained, and the operation body 6 and the like are lifted and restored by pushing down the pressing body 15 again to release the lock. [Effect] The operating shaft 6 is inserted into the mounting shaft 4, and the pressing body 15
Is provided on the lower wall 20b, the pressing of the pressing body 15 by the direction of the caster body 1 is not hindered by the floor leg 20 and can be easily performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock device for a caster that can be attached to the legs of furniture such as office and home tables and chairs.

[0002]

[Prior art]

 Conventionally, as a caster as described above, a roller is rotatably attached to a caster body by a horizontal shaft, and a lower end portion of a vertical axis of an attachment shaft is rotatably connected to the caster body about an axis. It is generally used that the mounting shaft is held by a caster mounting member such as a floor leg provided on a leg portion of a fixture such as a table, and the caster body is positioned 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 by a foot or the like to be supported by the caster body. In some cases, the locked 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 in which the lock of the roller is released, the furniture such as a table is moved to a use position on the floor surface by using a caster, and the roller is locked at this position, so that the furniture is inadvertently moved. I try not to move.

[0005]

[Problems to be solved by the device]

 However, in the conventional caster locking device described above, when a fixture such as a table is moved to the use position, the pressing body may be below the caster mounting member depending on the orientation of the caster body with respect to the caster mounting member. If the pressing member is pushed too close to the mounting member to make it impossible or difficult, the caster body and the roller should be oriented in the direction of the pressing member. There was a problem that the furniture would be displaced from the use position if it was moved to a position away from the mounting member that was easy to push down.

This invention solves the above-mentioned problems, and regardless of the orientation of the roller and the caster body, it is always easy to push down the pressing body of the operating mechanism with a foot, and the caster body It is an object of the present invention to provide a locking device for casters that does not require the troublesome work of changing the direction.

[0007]

[Means for Solving the Problems]

 In this invention, a roller is attached to a caster body by a horizontal axis, a vertical axis is attached to the caster body so as to be rotatable around the axis, and the attachment axis is held by a caster attachment member. In the caster locking device that locates the caster body below, the operating shaft urged upward by the return spring is inserted into the mounting shaft so that it can move up and down, and the engaging element at the lower end of the operating shaft moves up and down. The caster body supports a locking member that moves forwards and backwards and locks the roller so that the roller can be engaged and disengaged, and the box-shaped body fixed on the mounting member faces the upper end of the operation shaft inserted into the box-shaped body. The pressing body is engaged so that it can move up and down, and by pushing down this pressing body, the operating shaft and the operating shaft are kept in the roller lock state in which they are lowered, and the pushing body is pressed down again. And raising return the operating shaft, it is obtained by including an operation mechanism for releasing the locked state.

[0008]

[Action]

 In the caster lock device according to the present invention, the operating shaft is inserted into the mounting shaft connected to the caster body so as to rotate about the shaft so that the operating shaft can be moved up and down. It can be located on a caster mounting member such as the floor leg of the.

Therefore, regardless of the orientation of the roller and the caster body with respect to the mounting member, the pressing body is pushed down by a foot or the like to bring the roller into a locked state and an unlocked state. Can always be easier. In addition, it is not necessary to change the orientation of the caster body and the roller at the usage position of the table, etc.By changing the direction, the furniture such as the table does not move from the usage position, and the roller is locked at the correct usage position. , It is possible to prevent furniture from moving unintentionally.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In each of FIGS. 1 to 4, 1 is a caster main body, on which a left and right roller 3 is rotatably mounted by a horizontal horizontal shaft 2 and a vertical mounting shaft 4 The lower end of is fitted so as to be rotatable around its axis. The mounting shaft 4 is provided with a large diameter portion 4a located above the caster body 1, and a screw portion 4b is formed above the large diameter portion 4a.

The lock device 26, which is provided on the caster 5 configured as described above and blocks the rotation of the roller 3, is configured as follows. An operating shaft 6 is slidably inserted into the mounting shaft 4 in the axial direction, and an inverted conical connector 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 projecting 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 formed of a spring is interposed, and the return spring 8 urges the operation shaft 6 upward, and the upper end surface of the engaging element 7 is in contact with the lower surface of the outer peripheral side portion of the operation shaft 6 of the caster body 1.

An upper coil spring 9 having a stronger spring force than the return spring 8 is loosely fitted above the spring receiving plate 6 a of the operation shaft 6, and an elevating 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 6b provided at the upper end of the operating shaft 6 so as to have an enlarged diameter.

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

The locking portion 11c of the locking member 11 is accommodated in the window hole 1a formed in the caster body 1, and the locking portion 11c 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, and abuts against the engagement element 7 side wall of the window hole 1a. Further, left and right locking pieces 11d are formed on both ends of the locking portion 11c so as to be parallel to the horizontal axis 2.

The left and right rollers 3 are formed with annular flange portions 3a on their outer peripheral facing surfaces, and the inner peripheral surfaces of these flange portions 3a are fitted with the engaging pieces 11d. Therefore, the engaging recessed groove 3b that is engageably and disengageably engaged is formed over the entire circumference in the shape of a tooth groove of a gear. The rolling surfaces of the left and right rollers 3 are covered with a cover 1a formed integrally with the caster body 1.

The operating mechanism 13 for raising and lowering the operating shaft 6 includes 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. It is provided. In the box-shaped body 14, a locking projection 14b is projected below the central portion of each side wall 14a, and a guide projection 14c is formed on the outer surface of the end of each side wall 14a along 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 central portion of the.

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

In the pressing body 15, guide grooves 15b are formed on the inner surfaces of the end portions of the 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 having an upper surface 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 is connected to both ends is the same as the groove width of the cam groove 16.

The upper end of the large-diameter coil spring 18 is fitted onto 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 in, and the pressing body 15 is fitted on the outer periphery of the box-shaped body 14. The lower end of the large-diameter coil spring 18 is supported by the outer peripheral portion of the hole 14e of the bottom wall 14d provided in the box-shaped body 14, and the large-diameter coil spring 18 causes the pressing body 15 to move above the box-shaped body 14. By being biased, the guide groove 15b is slidably engaged with the guide protrusion 14c, and the steel ball 19 is movably accommodated across the interlocking groove 17 and the cam groove 16 The mechanism 13 is configured. The pressing body 15 has a small projection 15e projecting from the lower end of the guide groove 15b supported by a small projection 14g projecting from the upper end of the guide projection 14c of the box-shaped body 14 to allow the box-shaped body 14 to move upward. Is prevented from coming out.

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 on the left and right floor legs (caster mounting member). It is attached to the rear end portion 20a of 20. A recess 20c is formed in the lower wall 20b of the rear end 20a of the floor leg 20, and the recess 20c has a large screw hole 20d in the center and a small hole 20e and a locking hole 20f on the outer peripheral side thereof. There is.

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 a locking projection 14b protruding downward from the box-shaped body 14. It is elastically deformed to be fitted into the locking hole 20f of the recess 20c, the locking claw 14h provided on the locking projection 14b is locked to the lower surface of the recess 20c, and is formed on the bottom wall 14d of the box-shaped body 14. The box-shaped body 14 is positioned and fixed to the rear end portion 20a of the floor leg 20 by tightening the retaining screw 27, which is inserted into the small hole 20f of the recess 20c from below, into the formed screw hole 14f.

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

As described above, the casters 5 and the locking device 26 are mounted on the rear end portions 20a of the left and right floor surface legs 20, respectively, and the height adjustment is performed on the front end portions of the left and right floor surface legs 20. Each of the front casters 22 is attached, and the front ends of the left and right floor legs 20 are fixed to the lower ends of the left and right pedestals 23 to form the legs 24. A top plate 25 is pivotally supported so that it can be tilted.

A portion of the floor leg 20 behind the pedestal 23 is covered with a leg cover 29. 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 15 of the operating mechanism 13 is loosely fitted in the cover hole 29a, 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. The table 21 is folded up by raising the top plate 25, and while 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 is moved to a desired use position. 21 is moved.

When the large-diameter coil spring 18 is pressed down while being compressed, such as by stepping on the pressing body 15 of the lock device 26 with the foot in the use position of the table 21, the lifting plate 10 fitted to the upper end of the operation shaft 6 is pressed. The lower surface of the spring receiving cylinder 15d of the pressing body 15 pushes the spring receiving plate 6a of the operating shaft 6 downward via the upper coil spring 9 to lower the operating shaft 6 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 locking member 11 to push the locking member 11. The spring 12 is compressed and moved forward in the lateral direction. By this forward movement, the left and right locking pieces 11d provided on the locking portion 11c of the locking member 11 are fitted into one of the locking recessed grooves 3b formed in the flange portion 3a of the left and right roller 3, respectively, and locked. The roller 3 is locked by the piece 11d so that the roller 3 is locked to prevent its rotation.

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 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 moved downward by the straight groove 17 so that the straight groove 17 and the cam groove 16 are not moved. Is guided to reach the locking step portion 15a formed on the lower side portion of the cam groove 16.

At this time, when the pushing down of the pushing body 15 is released, the pushing body 15 is biased upward by the restoring force of the large-diameter coil spring 18, but the steel ball 19 is locked by the step portion of the cam groove 16. The operation shaft 6 is held in the lowered position by being locked to the upper surface of the locking step portion 16a by the 15a and not returning upward. 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.

When the top plate 25 is raised and folded in the use state and the pressing body 15 is pushed down again, the elevating plate 10 compresses the upper coil spring 9 and moves down together with the pressing body 15, and the steel ball 19 is engaged. When the pressing body 15 is released from the portion 15a and the pushing down of the pressing body 15 is released, the large-diameter coil spring 18 extends and the pressing body 15 returns to ascend. 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 that the locking member 11 returns to its original position due to the expansion of the push bar 12, and the locking member 11 separates from the roller 3 to release these locks. , The roller 3 becomes free.

After the roller 3 is in the free state, 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 when necessary. In this embodiment, the rollers 3 can be locked and unlocked with respect to the left and right casters 26, respectively, and the operation of raising and lowering the top plate 25 of the table 21 can be performed at an appropriate time.

Further, in this embodiment, a small disc may be screwed to the upper end surface of the operation shaft 6 to prevent the lift plate 10 from coming off. In order to facilitate the assembly work, the pressing body 15 of the operation mechanism 13 is pushed. May be divided in two in the vertical direction and fixed by an appropriate means.

In the present invention, the operation mechanism is not limited to the configuration of the above-described embodiment, but a box-shaped body fixed to a caster mounting member such as a floor leg of a table, and the box-shaped body. As long as the operating shaft is kept in the lowered position by pushing down the pressing body and the operating shaft is raised and returned by the return spring by pushing down the pressing body again, the caster can be changed up and down with respect to the caster mounting member. . Further, the present invention is not limited to the floor legs of the table described above, but can be widely applied to the legs of office and household fixtures such as legs fixed to the table top and chair legs. .

[0034]

[Effect of device]

 As described above, the caster locking device according to the present invention is connected to the caster body, and is returned to the mounting shaft that holds the body below the caster mounting member so that the operating shaft biased upward by the spring can be moved up and down. A box-shaped body that is inserted through the caster body is supported by a caster body that supports a locking member that reciprocally engages and disengages the roller by moving up and down an engaging element provided at the lower end of the operation shaft. , The pressing body facing the upper end of the operating shaft inserted in the box-shaped body is engaged in a vertically movable manner, and by pushing down the pressing body, the operating shaft together with the pressing body are kept in the roller lock state in which they are lowered and pressed. Since the pressing body and the operating shaft are raised and returned by pushing down the 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, the operating shaft is inserted into the mounting shaft rotatably connected to the caster body so that the operating shaft can be raised and lowered. It can be located on a caster mounting member such as a floor leg of a table that holds the mounting shaft. Therefore, regardless of the orientation of the roller and caster body with respect to the mounting member, it is always easy to push down the pressing body with your foot to put the roller in the locked state and unlocked state. You can

Further, it is not necessary to change the direction of the caster body and the roller at the use position of the table or the like, and by changing the direction, the furniture such as the table will not be displaced from the use position, and the roller can be set at the correct use position. It can be locked to prevent furniture from moving inadvertently.

[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-like 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, a vertical axis is attached to the caster body so as to be rotatable about the axis, and the caster is held by the caster attaching member. In a caster locking device in which the caster body is located below the operating shaft, an operating shaft urged upward by a return spring is inserted into the mounting shaft so that the operating shaft can be moved up and down, and an engaging member provided at the lower end of the operating shaft moves forward and backward. Then, a pressing member that supports a locking member that releasably locks the roller on the caster body and that is fixed on the mounting member is opposed to the upper end of the operation shaft inserted into the box. Are engaged in such a manner that they can be moved up and down, and by pushing down this pressing body, the operating shaft and the operating shaft are kept in a roller lock state in which these are lowered, and by pushing down the pressing body again, And a lock device for a caster, comprising an operation mechanism for lifting and returning the operation shaft and releasing the locked state.