JP2008049801A - Hand pushing type working truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand pushing type working truck capable of being stably stopped at its working position even under environment of a slippery road surface. <P>SOLUTION: The hand pushing type working truck 1 is provided with a permanent magnet 8 attractable to a metal surface in the used environment; and a movable rod 9 for releasing attraction to the metal surface by the permanent magnet 8. The movable rod 9 acts so as to separate the permanent magnet 8 from the metal surface. Further, the truck 1 is provided with a grip 7 for hand-pushing; and an attraction release mechanism 10 capable of operating the movable rod 9 near the grip 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hand-operated work cart, and more particularly, to a hand-operated work cart suitable for use in a wet place such as a food manufacturing factory.

  In a food production factory or the like, it is common for each worker in a production line to perform work using a hand-operated work carriage on which food and tools are placed. Conventionally, this type of work cart has been desired to be able to move easily while being able to stably stop at the work position. Therefore, a brake mechanism using a brake shoe that applies a load to the traveling wheel, One having a lock mechanism is widely known. Patent Document 1 discloses a technique in which a brake mechanism of a traveling wheel is operated by a lever installed at a handle portion of a carriage. A brake mechanism using a stepping type operation mechanism is also known.

JP 10-35500 A

  However, in food manufacturing factories and the like, the work road surface is often wet by water or oil, which adheres to the periphery of the traveling wheel and significantly increases the braking force of the wheel by the brake mechanism or the lock mechanism. There is a problem of lowering. In addition, even when the rotation of the wheel is stably stopped by these mechanisms, there is a problem that the wheel slips on a wet road surface. In particular, these problems are significant in places where the load applied to the carriage is large or the road surface is inclined.

  The present invention has been made in view of the above, and an object of the present invention is to provide a hand-operated work cart that can stably stop at the work position even in an environment where such a road surface is slippery.

  In order to solve the above-described problems and achieve the object, the hand-operated work carriage according to claim 1 includes a magnetic adsorption unit capable of adsorbing to a metal surface in an environment in which it is used, and the magnetic adsorption A suction release means for releasing the suction to the metal surface by the means.

  A hand-operated work cart according to claim 2 is the hand-operated work cart according to claim 1, wherein the suction release means is operated so as to separate the magnetic suction means from the metal surface. It is characterized by providing.

  According to a third aspect of the present invention, there is provided the hand-operated work cart according to the second aspect, wherein the hand-operated work cart has a handle portion for hand pushing and an operating mechanism capable of operating the movable rod in the vicinity of the handle portion. And.

  Further, the hand-operated work cart according to claim 4 further comprises brake means for the wheels of the hand-operated work cart according to claim 3, wherein the operating mechanism includes the movable rod and the brake. It can be operated in conjunction with the means.

  Further, the hand-operated work cart according to claim 5 is the hand-operated work cart according to any one of claims 1 to 4, wherein the attraction force of the magnetic attraction means is changed according to the weight of the load. It is characterized by comprising an adsorption force adjusting means.

  A hand-operated work cart according to claim 6 is the hand-operated work cart according to claim 5, wherein the magnetic adsorption means includes a plurality of adsorption surfaces, and the adsorption force adjusting means includes the plurality of adsorption forces. It is characterized in that a distance of at least one of the suction surfaces to the metal surface is changed.

  According to the present invention, since the hand-operated work carriage can be stopped by the magnetic adsorption means, the work carriage can be stably stopped even in an environment where the road surface is wet. .

  Further, according to the present invention, since the magnetic adsorption means is separated from the metal surface by the movable rod, the work carriage can be easily and reliably moved from the fixed state. . Further, the configuration can be made very simple, and the mechanism can be configured at low cost.

  In addition, according to the present invention, the movable rod can be operated in the vicinity of the handle portion, so that the release from the fixed state and the movement of the work carriage can be smoothly performed almost simultaneously.

  In addition, according to the present invention, the brake means for the wheels is provided, and this operation is interlocked with the movable rod, so that the working carriage is stopped more stably, while these are released. Can also be done easily.

  In addition, according to the present invention, since the attracting force of the magnetic attracting means is changed in accordance with the weight of the load, when the cart is on an inclined surface, the magnetic force is heavy when the load is heavy. It can comprise so that the adsorption | suction power of a type | formula adsorption | suction means may be raised. As a result, the weight of the carriage can be firmly fixed against the force of the carriage going down the inclined surface.

  According to the present invention, the magnetic adsorption means includes a plurality of adsorption surfaces, and among them, the distance between at least one adsorption surface and the metal surface is changed. It is possible to easily change the entire attraction force of the magnetic attraction means while maintaining the above.

  Hereinafter, embodiments of a hand-operated work cart according to the present invention will be described in detail with reference to the accompanying drawings. [I] First, the basic concept common to each embodiment was explained, then [II] the specific contents of each embodiment were explained, and [III] Finally, modifications to each embodiment were explained. To do. However, the present invention is not limited to each embodiment.

[I] Basic concept common to the embodiments First, the basic concept common to the embodiments will be described. The hand-operated work cart according to each embodiment is suitable for use in a food manufacturing factory, and includes a plurality of trays on which ingredients and tools are placed. The hand-operated work cart includes a traveling wheel and a handle for hand pushing. In the following description, a specific configuration of the hand-operated work carriage will be described, but the scope of application of the present invention is limited by the number and shape of trays, the arrangement and number of wheels, the arrangement of handles, and the like described here. It will never be done.

  One of the features of this hand-operated work carriage is that it is equipped with magnetic adsorption means that can adsorb metal surfaces in the environment in which it is used. In a preferred embodiment, the magnetic attraction means is a permanent magnet and is disposed on one side of the work carriage. In the environment in which the work carriage is used, the work carriage is stably fixed by adsorbing the magnetic adsorption means to the metal wall surface. In a use environment, when the floor surface is made of metal, the magnetic adsorption means can be disposed to face the floor surface.

  In addition, another feature of the hand-operated work carriage is that it includes a suction release unit for releasing the suction on the metal surface by the magnetic suction unit. In a preferred embodiment, the suction release means includes a movable rod. When the movable rod is operated, it extends ahead of the adsorption surface of the magnetic adsorption means, and pushes the work carriage away from the metal surface. The specific structure of the movable rod is shown below, but the scope of the present invention is not limited to its shape, arrangement, number, and mechanism.

[II] Specific contents of each embodiment [Embodiment 1]
Next, specific contents of each embodiment according to the present invention will be described. First, the first embodiment will be described. Here, the structure of the hand-operated work carriage and its usage will be described in order.

(Overall configuration of hand-operated work cart)
FIG. 1 is a perspective view of a hand-operated work cart according to the first embodiment. In the figure, a hand-operated work cart 1 according to the present embodiment is roughly structured by a steel three-stage tray 2 and four columns 3 supporting these trays at four corners. The wheel 4 attached to the lower end of each column 3 can run freely. Each tray 2 is provided with upright walls 2a around the four sides thereof, so that foods, guards, tools, etc. placed on the upper part of the tray 2 are designed not to slide out of the tray.

  On one side surface of the uppermost tray 2, a holding metal fitting 5 made up of a pair of hook claws is provided, and an arbitrary work tool can be hung on the holding metal fitting 5. A two-stage storage box 6 is provided on the lower surface of the uppermost tray 2. The storage box 6 can store various tools and food materials. As an example, a sterilized towel before use is stored in the upper stage, and a used towel is stored in the lower stage. In a preferred embodiment, the storage box 6 is configured to be removable from the uppermost tray 2.

  The hand-operated work cart 1 has a handle 7 on the side surface on the rear side in FIG. The handle 7 serves as a grip portion for the operator when the work cart 1 is pushed by hand. In the work cart according to the present embodiment, at the same time, the handle 7 serves as an operation lever of the suction release means described later. It has a function.

  Further, the hand-operated work cart 1 includes a permanent magnet 8 as a magnetic attraction means according to the present invention and a movable rod 9 constituting a part of the attraction release means on the front side surface in FIG. .

(Configuration of hand-operated work carriage-permanent magnet 8)
As shown in FIG. 1, the permanent magnet 8 is arranged along the lower part of the uppermost tray 2 on the front side surface of the work carriage 1. The permanent magnet 8 protrudes slightly outward from the other members, that is, the tray 2, the support column 3, the wheel 4, and the storage box 6, on the side surface thereof, to the base 1 a of the work carriage 1. Embedded. Therefore, when the work carriage 1 is brought into contact with a metal wall surface in the factory, the permanent magnet 8 comes into contact with the wall surface and is attracted by the magnetic force. In a preferred embodiment, it is possible to adopt a structure in which the permanent magnet 8 is housed in the base 1 a and the metal plate in contact with the permanent magnet 8 is exposed to the side surface of the work carriage 1. The size of the permanent magnet 8 is preferably determined according to the weight of the work carriage 1 or the weight of the article to be placed. However, as shown in the figure, when a permanent magnet having a general magnetic force is used, A length of about half the width is appropriate. The attractive force by the permanent magnet 8 is preferably determined in consideration of the ease of removal.

(Configuration of hand-operated work carriage-movable rod 9)
A pair of movable rods 9 are installed on both sides of the permanent magnet 8. The tip of the movable rod 9 is moved in and out by a suction release mechanism installed in a base 1a described later. In other words, the movable rod 9 is in a position where its tip surface is slightly recessed inward from the side surface of the work carriage 1 in the non-operating state, and is moved to a position protruding forward from the side surface in the operating state. The When the movable rod 9 is operated in a state where the work carriage 1 is in contact with the metal wall surface in the factory, the tip of the movable rod 9 extends ahead of the attracting surface of the permanent magnet 8 and presses the wall surface. Thus, the work carriage is pushed out of the wall surface.

(Configuration of hand-operated work cart-suction release mechanism)
Next, a suction release mechanism that operates the movable rod 9 will be described. FIG. 2 is a cross-sectional view showing a schematic mechanism of the suction release mechanism 10. As shown in the figure, the movable rod 9 is slidably held in the cylindrical guide portion 1 b of the base portion 1 a of the work carriage 1. The movable rod 9 is linked to the handle 7 via a link rod 11a, an L-shaped link 11b, and a link rod 11c. The handle 7 is supported to be rotatable about a shaft 7a, and the L-shaped link 11b is supported to be rotatable about a shaft 11d. The L-shaped link 11b is always urged counterclockwise by a spring 12 in the figure. In the steady state, the tip of the movable rod 9 is at a position retracted from the side surface 1c of the work carriage 1 as shown by a solid line in FIG. From this state, when the operator rotates the handle 7b of the handle 7 in the direction of pulling up, the link rod 11c is pulled down, and the L-shaped link 11b rotates clockwise against the urging force of the spring 12. Moved. As a result, the link rod 11a moves to the left in the figure and pushes the movable rod 9 attached to the tip thereof. As a result, the tip of the movable rod 9 protrudes outward from the side surface 1c of the work carriage 1 as indicated by a broken line in the figure. By performing the above operation while the permanent magnet 8 is attracted to the wall surface in the factory, the tip of the movable rod 9 pushes the wall surface. As a result, the work carriage 1 moves away from the wall surface, The joint with the magnet 8 is separated. As shown in FIG. 1, the movable rod 9 is provided on both sides of the permanent magnet 8, and these act simultaneously, so that the work carriage 1 can be separated from the wall surface stably and reliably. .

(How to use a hand-operated work cart)
Next, a general method of using the hand-operated work cart 1 according to the present embodiment will be briefly described. An operator places foods and tools required for work on the tray 2 of the hand-operated work cart 1 from a warehouse or other storage. The handle 7 is gripped, the work carriage 1 is caused to travel, and is moved to a target work position. At the work position, the work cart 1 is made to travel straight against the metal wall surface in the vicinity thereof, and the front portion is abutted against the wall surface. As a result, the permanent magnet 8 disposed at the front portion of the work carriage 1 is attracted to the metal wall surface and fixes the work carriage 1 here. In this state, even if the floor surface at the work position is wet with water or oil and is slippery, the work carriage 1 is firmly fixed to the wall surface by the permanent magnet 8 and therefore does not move. . In addition, when the wall surface in a factory is not a metal surface, or the target place to fix is not made of metal, it is necessary to stick a metal panel beforehand.

  On the other hand, when the necessary work is completed and the work cart 1 is to be moved, the operator pulls the handle 7 toward the user. By this operation, the upward component force of the pulling force causes the handle 7 to rotate counterclockwise. As a result, the suction release mechanism 10 is operated, and the movable rod 9 is projected from the front to push the wall surface. As a result, the work carriage 1 is separated from the wall and can move.

[Embodiment 2]
Next, the specific content of Embodiment 2 which concerns on this invention is demonstrated. This Embodiment 2 is a form provided with the brake release mechanism operated in conjunction with the movable rod 9 in the previous embodiment. FIG. 3 is a cross-sectional view showing a schematic mechanism of the suction release mechanism 10 and the brake release mechanism 20 according to the second embodiment. The configuration of the second embodiment is substantially the same as the configuration of the first embodiment unless otherwise specified, and the configuration substantially the same as the configuration of the first embodiment is used in the first embodiment. The same reference numerals are given as necessary, and the description thereof is omitted.

  In the second embodiment, the work carriage 1 includes a brake shoe 21 in the vicinity of the wheel 4. The brake shoe 21 is rotatably supported on a shaft 21a, and is urged counterclockwise by a spring 22 in the figure. As a result, the brake shoe 21 is in contact with the peripheral surface of the wheel 4 in a steady state, and serves as a brake for the rotation. The brake shoe 21 is connected to the L-shaped link 11b through a link rod 23.

  In this configuration, when the operator pulls up the handle 7, the L-shaped link 11b rotates in the clockwise direction. As described in the previous embodiment, the movable rod 9 protrudes from the side surface 1c and pushes the wall by the rotation of the L-shaped link 11b, and at the same time, the link rod 23 is pushed downward, and the brake shoe 21 is rotated against the urging force of the spring 22. As a result, the brake of the wheel 4 is released simultaneously with the movable rod 9 pushing the wall surface, and the work carriage 1 becomes free. Although not shown in the drawing, in the present embodiment, it is preferable that a lock mechanism for holding the released state is provided, so that the released state can be maintained even when the handle 7 is released. It becomes like this.

  In the second embodiment, when the work cart 1 is stopped, the double fixing mechanism by the permanent magnet 8 and the brake shoe 21 works to fix the work cart 1 more stably, while these release mechanisms are interlocked. It is easy to cancel it.

[Embodiment 3]
Next, the specific content of Embodiment 3 which concerns on this invention is demonstrated. The third embodiment is an example of a hand-operated work carriage in which the adsorption force of the magnetic adsorption means is variable according to the amount of load applied to the uppermost tray 2. FIG. 4 is an enlarged perspective view showing a part of the hand-drawn cart according to the third embodiment, and FIG. 5 is a schematic cross-sectional view showing the attraction force adjusting mechanism. In the third embodiment, the configuration is substantially the same as the configuration of the first embodiment unless otherwise specified. The configuration substantially the same as the configuration of the first embodiment is the same as that of the first embodiment. The same reference numerals as used are attached as necessary, and the description thereof is omitted.

  In the third embodiment, as shown in FIG. 3, the permanent magnet as the magnetic attraction means provided in the work carriage 1 includes two permanent magnets arranged in parallel, that is, the first magnet 30. And the second magnet 31. Here, as with the permanent magnet 8 in the first embodiment, the first magnet 30 is fixed in the base 1 a so that its attracting surface is exposed from the side surface of the work carriage 1. On the other hand, the second magnet 31 is similarly disposed in the base 1a so that its attracting surface is exposed from the side surface of the work carriage 1, but as will be described later, the attracting force adjusting means shown in FIG. Thus, the suction surface can be adjusted to advance or retreat with respect to the side surface of the work carriage 1.

  Next, the adsorption force adjusting means will be described with reference to FIG. As shown in the figure, the second magnet 31 is slidably held in the base 1a, and the uppermost tray is connected via a link mechanism including a link rod 32a, an L-shaped link 32b, and a link rod 32c. Linked to 2. In the third embodiment, the uppermost tray 2 is supported by a spring 33 disposed at the bottom thereof, so that the tray 2 has its vertical height position according to the weight of the article loaded therein. Is variable. In conjunction with this movement of the tray 2, the link mechanism is operated to change the amount d of the second magnet 31 attached to the tip thereof.

  When the article is not placed on the tray 2, that is, when the tray 2 is at its uppermost position by the force of the spring 33, the second magnet 31 is at the end of the stroke, and the pull-in amount d is maximized. On the other hand, when the article having the maximum loading load is placed on the tray 2, that is, when the tray 2 is at its lowest position, the second magnet 31 is at the foremost part of the stroke, and the drawing amount d is zero. . The adsorption position of the magnetic adsorption means with respect to the metal wall surface is determined by the adsorption surface position of the first magnet 30, that is, the position slightly protruding from the side surface of the work carriage 1, so that the position of the second magnet 31 in the stroke is determined. The strength of the attracting force is proportionally determined, and hence the strength of the entire attracting force in the magnetic attraction means is determined.

  Thus, in the hand-operated work cart 1 according to the third embodiment, the attracting force on the wall surface by the magnetic attracting means is changed according to the load amount of the article placed on the tray 2. As a result, when the loaded load is relatively heavy, the suction force is strengthened, and the work carriage 1 can be stably fixed. On the other hand, when the loaded load is relatively light, the suction force is increased. The work carriage 1 can be moved away from the wall surface with relatively little force.

[III] Modifications to Embodiments Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention are within the scope of the technical idea of each invention described in the claims. Can be arbitrarily modified and improved. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved. For example, the present invention can be widely applied to a hand-operated work cart, and is not limited to a form used in a food manufacturing factory as described above.

(Specific configuration of hand-operated work cart)
In the previous embodiment, an example in which the magnetic attraction means is constituted by a permanent magnet has been shown. However, this may be constituted by an electromagnetic attraction means using an electromagnet or the like. Moreover, although the example which comprised the adsorption | suction cancellation | release means with the movable rod and the link mechanism which operates this was shown, other methods, for example, using the shielding plate which moves in and out of the adsorption surface, or using the electromagnet If this occurs, this can be realized by using on / off of the power. It is obvious that the link mechanism used in various parts of the embodiment can also be realized by various existing methods. Further, the attractive force adjusting means in the third embodiment is configured by using a permanent magnet divided into two, but may be configured such that one magnet is withdrawn and withdrawn, and a plurality of magnets are further provided. It may be configured to be divided into a part and a part of them may be withdrawn.

  The hand-operated workbench according to the present invention is particularly useful for use in places where the road surface is wet, such as a food manufacturing factory.

1 is a perspective view of a hand-operated work cart according to Embodiment 1 of the present invention. It is sectional drawing which showed the schematic mechanism of the adsorption | suction cancellation | release mechanism. It is sectional drawing which showed the schematic mechanism of the adsorption | suction cancellation | release mechanism which concerns on Embodiment 2, and a brake cancellation | release mechanism. It is a perspective view which expands and shows a part of push-type trolley | bogie which concerns on Embodiment 3. FIG. FIG. 10 is a schematic cross-sectional view showing an adsorption force adjusting mechanism of a hand cart according to a third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hand-operated work cart 1a Base 1b Cylindrical guide part 2 Tray 2a Standing wall 3 Post 4 Wheel 5 Grip metal fitting 6 Storage box 7 Handle 7b Grip part 8 Permanent magnet 9 Movable rod 10 Adsorption release mechanism 11a, 11c Link rod 11b L type Link 12 Spring 20 Brake release mechanism 21 Brake shoe 22 Spring 23 Link rod 30 First magnet 31 Second magnet 32a, 32c Link rod 32b L-shaped link 33 Spring

Claims (6)

Magnetic adsorption means capable of adsorbing to metal surfaces in the environment used;
An adsorption release means for releasing the adsorption to the metal surface by the magnetic adsorption means;
A hand-operated work cart characterized by comprising: The adsorption release means is
A movable rod operated to separate the magnetic adsorption means from the metal surface;
The hand-operated work cart according to claim 1, comprising: A handle for pushing,
An operating mechanism capable of operating the movable rod in the vicinity of the handle;
The hand-operated work cart according to claim 2, further comprising: Further comprising braking means for the wheel of the hand-operated work carriage,
The operation mechanism is capable of operating the movable rod and the brake means in conjunction with each other.
The hand-operated work cart according to claim 3. An attraction force adjusting means for changing the attraction force of the magnetic attraction means according to the weight of the load;
The hand-operated work cart according to any one of claims 1 to 4, further comprising: The magnetic adsorption means comprises a plurality of adsorption surfaces;
The suction force adjusting means is configured to change a distance of at least one suction surface of the plurality of suction surfaces with respect to the metal surface;
The hand-operated work cart according to claim 5.

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