JP2663706B2 - Wagon wheel locking device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wagon wheel lock device applied to a mobile wagon used in an office or the like.

[Related Art] A wagon of this type is provided with a plurality of drawers, and wheels or casters are attached to four corners on a lower surface so that the wagon can be moved as required.
In addition, when used as a desk sleeve or placed in a specific location, a locking device should be attached to the wheels or casters to prevent the wagon from running or shifting. There are few things.

[Problems to be Solved by the Invention] However, in this type of wagon, it is usual that wheels and casters are disposed at positions retreated from the surface of the wagon so as to be less noticeable. Therefore, if a lock device is provided directly on the wheels or casters, it is difficult to easily determine whether or not these are in a locked state, and it is necessary to bend over the upper body when determining or operating the state. Requires a good posture.

Further, since the locking device is directly provided on each wheel or the like, the number of parts is large, and the structure is complicated and the components are required to be dense. For this reason, if the drawer is frequently opened and closed or the wagon is moved without knowing the locked state, the locking device may be overloaded and may break down.

An object of the present invention is to solve the above problems.

[Means for Solving the Problems] The present invention employs the following means in order to achieve such an object.

That is, the wheel lock device of the wagon according to the present invention,
An operation shaft having a torsion portion having a polygonal cross section twisted around the axis, a slider fitted to the torsion portion so as to be reciprocally slidable in the axial direction of the operation shaft, and rotation of the slider. Rotation preventing means for preventing rotation of the operating shaft, and locking means for locking a plurality of wheels when the operating shaft is rotated about the axis by moving the slider in the axial direction of the operating shaft. It is characterized by.

In order to prevent the rotation of the slider without using a special holding tool, the rotation preventing means may be constituted by an operation window formed in the wagon body.

In order to securely and easily lock a plurality of wheels when the operation shaft is rotated around the axis, a locking means is provided by a pair of lifting rods arranged on both sides of the wagon body so as to be able to move up and down, and left and right. And a concave portion formed on the inner periphery of the wheel, and the upper end of the elevating rod is hooked on bent portions provided at both ends of the operation shaft, and the lower end is projected toward the concave portion, and the operation is performed. It is preferable that the lower end of the elevating rod can be fitted into and removed from the recess in conjunction with a shaft.

In order to effectively utilize the space in the side plate and to prevent the lifting rod from interfering with the rail supporting the drawer, the lifting rod may be housed in the side plate of the wagon body.

In order to securely lock the wheel, a slit may be formed in the bracket on which the wheel is mounted, and the lower end of the lifting rod may be located in the slit.

[Operation] With such a configuration, when the slider whose rotation is prevented by the rotation preventing means is slid in the axial direction of the operation shaft, the operation shaft is moved to the slider by the twisted portion of the operation shaft. It relatively rotates with respect to it. Thus, since the locking means locks or unlocks the plurality of wheels, it is not necessary to lock the individual wheels, and the operation is facilitated. In addition, it is possible to arrange a slider at a position that is relatively conspicuous at a position away from the wheels, for example, a front side of the wagon, and to lock or unlock a plurality of wheels simultaneously by operating the slider. Become.

Further, when the slider, the rotation of which is prohibited by the rotation preventing means, is moved along the twisted portion of the operation shaft, the operation shaft rotates around the axis, and the locking means moves the plurality of wheels in conjunction with the operation. At the same time, there is no need to separately attach a locking device to each wheel.

Moreover, the slider can be moved only when operated along the operation axis. For this reason, even if a force for rotating the operation shaft around the axis when the wheel is locked acts on the operation shaft, the force does not cause the slider to move on its own, and the wheel lock is released without permission. Nothing is done.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown schematically in FIG. 1, the wagon is a movable wagon in which wheels 2 are arranged on a front end of a lower surface 1a of a wagon main body 1 and casters 3 are arranged on a rear end side. A wheel lock device 4 is provided on the front surface 1b side of the device 1.

The wagon body 1 is provided with a plurality of drawers (not shown), the side plate 11 is a hollow body having a cavity between an outer plate and an inner plate, and an inclined surface portion 1c is formed on the upper end side of the front surface 1b. It is.

The wheel lock device 4 includes an operation shaft 5, a slider 6, an operation window 7 as rotation prevention means, an elevating rod 8 as lock means, and a recess 2 a formed on the inner periphery of the wheel 2.

The operation shaft 5 is disposed in the left-right direction in the upper end on the front surface 1b side of the wagon body 1, and has a polygonal cross section as a whole. A twisted portion 5a twisted around the axis is provided in the middle of the operation shaft 5 in the left-right direction, and a bent portion 5b is formed at both ends in a direction orthogonal to the twisted portion 5a. The operation shaft 5 is held by the wagon body 1 so as to be able to rotate around the axis within a certain range.

The slider 6 is formed by integrating upper and lower divided pieces, and is fitted to the torsion portion 5a of the operation shaft 5 so as to be reciprocally slidable in the axial direction of the operation shaft 5, and has an operation knob 6a in the middle. have. On the right side of the operation knob 6a, as shown in FIG.
Is displayed to indicate that it is possible to travel, and the operation knob
A display indicating that the wheel 2 is locked is provided on the right side of 6a.

The operation window 7 is provided on the inclined surface 1c of the wagon body 1, and houses the slider 6 in the operation window 7 so as to be movable in the left-right direction.

The lifting rods 8 are respectively housed in the side plates 11 of the wagon body 1 so as to be able to move up and down, and upper ends 8 a of the lifting rods 8 are bent inward and hooked to the bent portions 5 a of the operation shaft 5. A lower end portion 8b of the lifting rod 8 is bent in a crank shape, and has a lower end 8c protruding inside the wheel 2.

The wheels 2 are, as schematically shown in FIGS. 1 and 3,
It is attached to the lower surface 1a of the wagon body 1 via a bracket 9, and has a plurality of recesses 2a on its inner periphery as shown in FIG.
Are formed at equal angular intervals. Thus, the lower end 8c of the lifting rod 8 can be vertically displaced between the recess 2a of the wheel 2 and the boss 2b. Also, slits 9a are formed in the bracket 9 to be continuous in the vertical direction, respectively.
The lower end 8b of the lifting rod 8 is located in each slit 9a.

According to such a configuration, when the slider 6 is moved to the lock position along the torsion portion 5a of the operation shaft 5, the slider 6
The operation shaft 5 rotates by a certain angle due to the cooperation of the torsion portion 5a, and the left and right bent portions 5b rotate upward (see imaginary lines in FIGS. 2 and 3). As a result, the right and left lifting rods 8 rise, and the lower end 8c is
And the rotation of each wheel 2 is prevented.

When releasing the locked state of the wheel 2, when the slider 6 is moved to the unlocked position, the operation reverse to the above-described operation is performed, and the lower end 8 c of the lifting rod 8 is detached from the recess 2 a of the wheel 2. I do. In that case, each wheel 2 can be rotated, and the wagon can be moved freely.

With such a configuration, the left and right wheels 2 can be securely locked or unlocked by simply moving the slider 6 disposed at the upper end of the front of the wagon slightly left and right. Operability can be improved.

Moreover, the slider 6 is movable only when operated along the operation shaft 5. For this reason, wheel 2
When the force of rotating the operation shaft 5 around the axis is applied to the operation shaft 5 by the load of the elevating rod 8 or the like at the time of locking, the slider 6 does not move by itself due to the force. The locked state of No. 2 is not released without permission.

Further, if an operation window 7 is formed in the wagon body 1 and the slider 6 is disposed in the operation window 7 so as to be movable in the left-right direction, the rotation of the slider 6 can be performed without using a special holding tool. Since this can be prevented, the structure can be simplified and the number of parts can be effectively suppressed.
In addition, if the operation window 7 is formed on the upper end side of the front surface 1b of the wagon main body 1 and the slider 6 is disposed on the operation window 7, it is easy to determine whether the wheel 2 is locked or not depending on the position of the slider 6. Can be identified. For this reason, it is possible to avoid a situation in which the wagon is moved while the wheels 2 are locked, and it is possible to effectively prevent an excessive external force from being applied to the lock device 4, thereby improving the durability.

The locking means includes left and right elevating rods 8 disposed on both sides of the operation shaft 5 and concave portions 2 a formed on the inner periphery of each wheel 2, and the rotation of the operation shaft 5 accompanying the operation of the slider 6 is provided. When the lifting rod 8 is raised and lowered in conjunction with the above, and the lower end 8c thereof is fitted into and removed from the recess 2a, the left and right wheels 2 are securely locked or the locked state is released while simplifying the structure. can do.

Usually, the side plate 11 of the wagon is often hollow. Therefore, if the lifting rod 8 is disposed in the side plate 11, the space in the side plate 11 can be effectively used, and the lifting rod 8 can be effectively prevented from interfering with the rail supporting the drawer. Can be.

If a slit 9a is formed in the bracket 9 to which the wheel 2 is attached, and the lower end 8b of the lifting rod 8 is located in the slit 9a, the lifting rod can be moved when the wagon is moved in the locked state. When a rotational force acts on the lower end 8c of the wheel 8 in the traveling direction of the wheel 2, the lower end 8c abuts on the vertical surface 9b of the slit 9a, and the rotation of the lifting rod 8 is prevented. Therefore, the locked state of the wheel 2 is not released without permission by the movement of the wheel 2 itself.

In the above-described embodiment, the case where the entire operation shaft has a quadrangular cross section has been described. However, at least the operation portion of the operation shaft may be polygonal and twisted around the axis.

Further, the rotation preventing means is not limited to the operation window formed in the wagon body, but may be a separate holder. However, in order to reduce the number of parts, it is preferable to adopt the above-described configuration.

Further, the locking means is not limited to the one provided with the elevating rod, and may be a band-shaped one. In this case, for example, a rod whose tip projects toward the inner surface of the wheel is linked to the lower end of the belt-shaped transmission body in a link manner, and the tip of the rod is fitted into and removed from the recess of the wheel as the transmission body moves up and down. By doing so, the wheels can be locked or unlocked.

[Effect of the Invention] Since the present invention has the above-described configuration, it is possible to easily determine whether or not the wheels are locked in an easy posture, and to lock or lock a plurality of wheels simultaneously by one operation. A wagon wheel lock device that can be released and has excellent operability can be provided.

If an operation window is formed in the wagon main body, and the slider is disposed so as to be movable in the left and right direction in the operation window, the rotation of the slider can be prevented without using a special holding tool, so that the structure is improved. Can be simplified, and the number of parts can be effectively reduced.

The locking means is provided with left and right lifting rods arranged on both sides of the operation shaft and a recess formed on the inner periphery of the wheel, and the lower end of the lifting rod is moved in conjunction with the rotation of the operation shaft accompanying the operation of the slider. If it is made to fit into the recess,
The plurality of wheels can be reliably locked or the locked state can be released while simplifying the structure.

If the lifting rod is arranged in the side plate of the wagon body,
The space in the side plate can be effectively used, and the lifting rod can be effectively prevented from interfering with other members.

Also, if a slit is formed in the bracket that holds the wheel and the lower end of the lifting rod is located in the slit, even if an external force acts on the lifting rod from the wheel side, the rotation of the lifting rod will be effective. It is possible to prevent the wheel from being locked and to securely lock the wheel.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a perspective view, and FIG.
Fig. 3 is a side view of a partial cross section, Fig. 3 is a front view of a main part of a partial cross section, and Figs. 4 and 5 are perspective views showing an operation mode of a slider. DESCRIPTION OF SYMBOLS 1 ... Wagon body, 1b ... Front 2 ... Wheel, 2a ... Locking means (recess) 4 ... Wheel locking device, 5 ... Operation shaft 5a ... Twisted section, 5b ... Bending section 6 ... Slider 7 Rotation preventing means (operation window) 8 Locking means (elevating rod) 8a Upper end, 8b Lower end 8c Lower end, 9 Bracket 9a Slit

Claims (5)

(57) [Claims] An operating shaft having a polygonal torsion having a polygonal cross section twisted around an axis; a slider fitted to said torsion so as to be reciprocally slidable in the axial direction of said operation shaft; A rotation preventing means for preventing rotation of the slider, and a locking means for locking a plurality of wheels when the slider is moved in the axial direction of the operation shaft and the operation shaft is rotated around the axis. A wheel lock device for a wagon, comprising: 2. The wagon wheel lock device according to claim 1, wherein the rotation preventing means is an operation window formed in the wagon body. 3. The locking means comprises a pair of lifting rods disposed on both sides of the wagon body so as to be able to move up and down, and concave portions formed on the inner circumferences of left and right wheels. Hanging on the bent portions provided at both ends of the operation shaft, with the lower end protruding toward the concave portion, the lower end of the lifting rod can be fitted into and removed from the concave portion in conjunction with the operation shaft. The wagon wheel lock device according to claim 1 or 2, wherein: 4. The wagon according to claim 3, wherein the lifting rod is accommodated in a side plate of the wagon body. 5. The wagon wheel lock device according to claim 3, wherein a slit is formed in a bracket on which the wheel is mounted, and a lower end portion of the lifting rod is located in the slit.