JP5951652B2 - Auxiliary wheel for cart - Google Patents

Description

  The present invention is a detachable attachment to a carriage having a wheel on which a heavy article is mounted and can move only in one direction, such as a drawer type circuit breaker used in a switchboard or the like. The present invention relates to a dolly auxiliary wheel that can move in a direction.

  In a drawer type circuit breaker (metal clad switchgear) installed in a power system transmission line or switchboard equipment, the circuit breaker body is usually mounted on a carriage, and the drawer type circuit breaker is inserted to a predetermined position in the storage room. By connecting the movable connection terminal provided on the back of the circuit breaker body and the fixed connection terminal of the main circuit disposed in the storage chamber, the power system is closed, and the drawer type circuit breaker is pulled out to a predetermined position. Thus, the movable connection terminal is separated from the fixed contact terminal so that the power supply system is opened.

  Such a pull-out type circuit breaker can open and close the power supply system only by moving in and out of a predetermined position in the storage room, so the wheels provided on both sides of the carriage are usually It is only attached so that it can rotate freely with respect to the axle fixed to both sides of the vehicle, and it is only planned to move the carriage back and forth (see Patent Documents 1-3).

JP-A-8-183457 JP-A-11-69518 JP 2000-147331 A

  However, in order to check the circuit breaker body, etc., when moving it from the inside of the metakura board to the inspection place, there are cases where it is desired to move not only in the forward / backward direction but also in any direction such as a left / right movement. Since it is very heavy, when it is desired to change the direction of movement to the left and right, the direction of the carriage is changed by forcibly applying a force to the circuit breaker in the left and right direction and dragging the wheel.

  In this way, in a cart on which a heavy object is placed and only a linear movement is scheduled, the direction in the left-right direction cannot be easily changed, so that the work efficiency is deteriorated, and the existing wheels There is an inconvenience that puts excessive force on.

  Therefore, in the present invention, a heavy truck such as a circuit breaker body is mounted, and a carriage provided with wheels that can move only in one direction can be easily changed in direction without dragging existing wheels. The main object is to provide an auxiliary wheel for a carriage that can avoid applying an excessive load to existing wheels.

In order to achieve the above object, an auxiliary wheel according to the present invention is a dolly auxiliary wheel that is detachably attached to a dolly equipped with a wheel that can move in only one direction, and is an axle of the axle to which the wheel is attached. A cylindrical portion that can be attached to and detached from a portion projecting outward from the wheel, a mounting base that is integrated with the cylindrical portion and that mounts a mounting portion provided in the vicinity of the wheel of the carriage, and this mounting And a free caster that is fixed to the bottom surface of the pedestal, has the cylindrical portion mounted on the axle, and has a lower end positioned below the wheel in a state where the placement site is placed on the pedestal. It is said.

Therefore, if the cylinder part is attached to the part that protrudes outward from the wheel of the axle to which the wheel of the carriage is attached , and the placement part of the carriage is placed on the stage, the existing wheel of the carriage will be removed from the floor. The floating caster will come into contact with the floor instead. For this reason, the cart does not depend on the movement of the existing wheels, and is directed in a free direction by the free caster.

Here, the mounting table extends in a direction perpendicular to the axis of the cylindrical portion, and a mounting plate on which the mounting site is mounted, and a side edge of the mounting plate on the outside of the carriage. It is good to comprise from the standing board erected from.
By setting it as such a structure, when mounting a trolley | bogie on a mounting board, it becomes possible to regulate a mounting position to a predetermined position with a standing board, and a mounting position does not shift.

  In order to prevent the axle from dropping from the cylindrical portion, for example, the cylindrical portion is formed such that the axial dimension is shorter than the protruding amount of the portion of the wheel axle that protrudes outward from the wheel, A cap may be attached to a portion of the axle protruding from the cylinder when the cylinder is attached to the axle.

  Moreover, it is preferable that the site | part which the mounting site | part of a mounting base mounts is just above the said universal caster. By setting it as such a structure, it will receive the load from a trolley mainly with a movable caster, and it will become possible to reduce the load applied to the axle of the wheel of a trolley | bogie.

As described above, according to the auxiliary wheel for a trolley according to the present invention, the cylindrical portion that can be attached to the portion protruding outward from the wheel of the axle to which the wheel of the trolley is attached, and the cylindrical portion are integrated. A mounting table for mounting the mounting portion of the carriage, and a free caster fixed to the bottom surface of the mounting table, and a cylindrical portion is mounted on the axle of the wheel of the carriage, and the carriage is mounted on the mounting table. By placing the mounting part, the free wheel can be brought into contact with the floor with the existing wheel of the cart floating, so that the cart can be moved in any direction without depending on the movement of the existing wheel. It is possible to improve work efficiency. Further, since the direction can be easily changed without dragging the existing wheel when the carriage on which a heavy object such as a breaker body is mounted, an excessive load is not applied to the existing wheel.

FIG. 1 is a perspective view showing a schematic configuration of a drawer type circuit breaker (metal clad switchgear). FIG. 2 is a view showing an auxiliary wheel according to the present invention, in which (a) is a front view thereof, (b) is a plan view thereof, and (c) is a side view thereof. FIG. 3 is a view showing a state before and after the auxiliary wheel according to the present invention is attached to and detached from the axle of the wheel of the existing carriage, and (a) is a perspective view showing a state before the auxiliary wheel is attached to the axle of the carriage. (B) is a perspective view which shows the state which attached the auxiliary wheel to the axle shaft of the trolley | bogie. 4A and 4B are diagrams for explaining the relationship between the auxiliary wheel and the existing wheel according to the present invention, in which FIG. 4A is a front view thereof, FIG. 4B is a plan view thereof, and FIG. 4C is a side view thereof. FIG. 5 is a view showing a modified example of the auxiliary wheel according to the present invention, in which (a) is a plan view thereof, and (b) is a perspective view showing a state in which the auxiliary wheel is attached to the axle of the carriage. 6A and 6B are diagrams showing another modified example of the auxiliary wheel according to the present invention. FIG. 6A is a front view thereof, and FIG. 6B is a perspective view showing a state where the auxiliary wheel is attached to the axle of the carriage. .

  Hereinafter, embodiments of auxiliary wheels according to the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, a drawer type circuit breaker (metal clad switchgear) 1 is shown as an example of a carriage on which a heavy object is mounted. This draw-out type circuit breaker (metal clad switchgear) 1 is a publicly known one, and the distribution line side movable connection terminal connected to the distribution line side fixed connection terminal provided on the switchboard (metacladding board) on the carriage 2. 3 and the bus-side movable connecting terminal 4 connected to the bus-side fixed connecting terminal provided on the distribution board (metacladding board) are provided in a protruding state, and the distribution line-side movable connecting terminal 3 and the bus-side movable connecting terminal 4 are provided. Is connected via the vacuum shut-off unit 5, and this vacuum shut-off unit 5 can be operated by a signal from the operation unit 6 to open and close between the distribution line side movable connection terminal 3 and the bus bar side movable connection terminal 4. It has become.

  The carriage 2 is provided with axles 6, 7 projecting in the left-right direction on the front and rear, left and right, and wheels 8, 9 are rotatably attached to the axles 6, 7. The wheels 8 and 9 are arranged in the wheel arrangement recesses 10 and 11 provided in the side edge portions in the vicinity of the four corners of the carriage 2 so that the wheels 8 and 9 do not protrude to the side of the carriage 2. Further, in this example, the axle 6 of the front wheel 8 protrudes long outward.

  Therefore, the carriage 2 can move smoothly only in the front-rear direction (direction perpendicular to the axis of the axle), and the front part of the front wheel 8 of the carriage 2 is described later. It becomes the mounting part 12 to be mounted on the mounting table 22 of the auxiliary wheel 20 to be performed.

  In contrast, the switchboard 15 is provided with a pair of guide rails (not shown) arranged in parallel on the floor plate constituting the floor surface, and rolls the wheels 8 and 9 along the guide rails. Thus, the pull-out type circuit breaker 1 is operated at the position where the distribution line side movable connection terminal 3 and the busbar side movable connection terminal 4 are joined to the distribution line side fixed connection terminal and the busbar side fixed connection terminal, respectively, and the disconnection position ( The distribution line side movable connection terminal 3 and the bus bar side movable connection terminal 4 can be moved to positions separated from the distribution line side fixed connection terminal and the bus line side fixed connection terminal, respectively.

  When the pull-out type circuit breaker (metal clad switchgear) 1 is pulled out and moved to the inspection place for periodic inspection from the switchboard 15 or for inspection or repair when a failure occurs, the front wheel 8 An auxiliary wheel 20 described below is attached.

  As shown in FIGS. 2 and 3, the auxiliary wheel 20 includes a cylindrical tube portion 21 that can be mounted on a portion of the axle 6 of the wheel 8 that protrudes outward from the wheel, and the tube portion 21. And a mounting table 22 having a cylindrical portion 21 disposed at one end, and a free caster 23 fixed to the bottom surface of the other end of the mounting table 22.

  The cylindrical portion 21 has an inner diameter equal to or slightly larger than the outer diameter of the axle 6 of the wheel 8, and the opening end on the side where the axle 6 is inserted is tapered so that the axle 6 can be easily inserted. You may form in.

  The mounting table 22 is integrated with the cylindrical portion 21 by welding or the like, and includes a mounting plate 22a having a mounting surface extending in a direction perpendicular to the axis of the cylindrical portion 21, and the mounting plate 22a. It is comprised from the standing board 22b standingly arranged from the side edge used as the outer side of the trolley | bogie of the mounting board 22a.

  The mounting plate 22a is formed with a notch 25 at a corner opposite to the standing plate 22b on the cylindrical portion 21 side in order to avoid interference with the wheel 8 existing on the carriage 2, and is joined to the cylindrical portion. The portion is a narrow portion 22a-1 formed to be narrow, and the width of the free caster 23 side from the narrow portion 22a-1 is a width that allows the placement portion 12 of the carriage 2 to be placed. It is formed in the wide part 22a-2.

  The cylindrical portion 21 is aligned with the side edge of the narrow portion 22a-1 so that one opening end face is projected to the side from the standing plate 22b. In this example, the axle of the wheel 8 is provided. 6 is formed longer than the protruding amount of the portion protruding outward from the wheel.

The standing plate 22b functions as a positioning when placing the placement portion 12 of the carriage 2 on the placement plate 22a. This function is obtained, and the carrying and auxiliary wheels 20 are mounted on the carriage 2. There is no particular limitation on the vertical dimension as long as it is easy to do.
Note that the cylindrical portion 21 and the mounting table 22 are made of a highly rigid metal material.

  The universal caster 23 is known per se, and is fixedly supported by a fixed plate 23a fixed to the bottom surface of the mounting table 22, a universal bracket 23b installed on the fixed plate 23a via a bearing device, and the universal bracket 23b. It is comprised from the wheel 23c, and has a structure shifted from the pivot supported by the bearing device and the vertical line passing through the wheel support shaft of the universal bracket.

  And in the state which mounted | wore the axle part 6 of the wheel 8 with the cylinder part 21 of the auxiliary wheel 20, and mounted the mounting part 12 in the mounting plate 22a of the mounting base 22, as FIG. 4 shows. The lower end of the universal caster 23 is located below the lower end of the existing wheel 8 (there is a difference in height of ΔH), and the existing wheel 8 is mounted on the mounting plate 22a (wide portion 22a-2) of the mounting table 22. It is arranged without interfering with. Moreover, the wide part 22a-2 of the mounting plate 22a is formed from the front side of the existing wheel 8 to the upper part of the free caster 23, and has a sufficient length to allow the mounting site 12 to be mounted. It is formed in W (about 10 to 20 cm).

  In the above configuration, in order to attach the auxiliary wheel 20 to the cart 2 of the existing drawer type circuit breaker (metal clad switchgear) 1, the front side of the cart 2 is slightly lifted using a jack or the like, and in that state, from the side The cylinder portion 21 of the auxiliary wheel 20 is externally mounted on the axle 6 of the wheel 8, and the mounting table 22 is parallel to the side edge of the carriage 2 while the placement portion 12 of the carriage 2 is in contact with the standing plate 22 b of the placement table 22. In this state, the carriage 2 is lowered and the placement site 12 is placed on the placement plate 22 a of the placement table 22. Such an operation is performed on the left and right front wheels 8 respectively. Then, the existing wheel 8 on the front side of the carriage 2 is in a state of floating from the floor, and the free caster 23 is in contact with the floor instead. In such a state, since the circuit breaker itself has a considerable weight, the installation state of the auxiliary wheel 20 is fixed only by placing it on the mounting table 22 (mounting plate 22a), and the cylinder of the auxiliary wheel 20 is fixed. The part 21 does not come off from the axle 6 of the wheel 8.

  Accordingly, the cart 2 in which the auxiliary wheel 20 is mounted on the front wheel 8 is free to be directed not only in the front-rear movement but also in an arbitrary direction. Therefore, the drawer type circuit breaker (metal clad switchgear) 1 Can be smoothly moved from the inside of the metakura board to the inspection place without using a carriage for transportation. Further, since the existing wheels are not dragged, there is no possibility that an excessive load is applied to the existing wheels.

  In this example, the auxiliary wheel 20 is attached only to the front wheel 8 of the carriage 2. However, if the moving direction of the front side of the carriage 2 is changed, the rear wheel 9 follows this. Therefore, the auxiliary wheel 20 need not be provided on the rear side. However, if it is desired to obtain a smoother movement, the rear wheel 9 may have the same structure.

  As for the carriage on which the heavy object is placed as described above, the auxiliary wheel 20 does not come off from the axle 6 of the carriage 2 (although the axle 6 of the wheel 8 does not come off from the cylindrical portion 21). In order to prevent the auxiliary wheel 20 from coming off more surely, as shown in FIG. 5, the axial dimension of the cylinder portion 21 is determined from the protruding amount of the portion of the axle 6 of the wheel 8 that protrudes outward from the wheel. Alternatively, the cap 30 may be attached to a portion of the wheel 8 protruding from the cylindrical portion 21 of the axle 6 by screwing or the like.

Further, in the above-described configuration, the example in which the placement portion 12 of the carriage 2 is placed between the cylindrical portion 21 of the auxiliary wheel 20 and the universal caster 23 is shown. However, as shown in FIG. The size of the mounting table 22 may be shortened (the distance between the cylindrical portion 21 and the universal caster 23 may be shortened), and the portion of the mounting table 22 on which the placement site 12 is placed may be directly above the universal caster 23.
With such a configuration, the load from the placement part 12 of the carriage 2 is mainly received by the movable caster 23, and it is possible to prevent an excessive load from being applied to the axle 6 of the wheel 8 of the carriage 2. Become.

2 Carriages 12 Placed Parts 20 Auxiliary Wheels 21 Cylindrical Parts 22 Mounted Tables 22a Mounted Plates 22b Standing Plates 23 Swivel Casters 30 Caps

Claims (4)

A dolly auxiliary wheel that is detachably attached to a dolly equipped with wheels that can move in only one direction ,
A cylindrical portion detachably attached to a portion protruding outward from the wheel of the axle to which the wheel is attached ;
A mounting table that is integrated with the cylindrical portion and that mounts a mounting portion provided in the vicinity of the wheel of the carriage,
A free caster that is fixed to the bottom surface of the mounting table, has the cylindrical portion mounted on the axle, and has a lower end positioned below the wheel in a state where the mounting portion is mounted on the mounting table. Auxiliary wheel for trolley characterized by this.   The mounting table extends in a direction perpendicular to the axis of the cylindrical portion, and stands from a mounting plate on which the mounting site is mounted and a side edge of the mounting plate that is outside the carriage. The auxiliary wheel for a trolley according to claim 1, comprising a standing plate provided.   The cylindrical portion is formed such that an axial dimension is shorter than a protruding amount of a portion of the wheel axle that protrudes outward from the wheel, and when the cylindrical portion is attached to the axle, the cylindrical portion is separated from the cylindrical portion of the axle. The auxiliary wheel for a carriage according to claim 1 or 2, wherein a cap is attached to the protruding portion.   The auxiliary wheel for a trolley according to any one of claims 1 to 3, wherein a portion of the mounting table on which the mounting portion is mounted is directly above the universal caster.

Images