JP4383962B2 - Fork stopper - Google Patents

Description

  The present invention relates to a forklift stopper that avoids interference between a distribution device such as a container or a pallet that is transported by a forklift and a tag antenna mounted on the forklift.

  Conventionally, ID tags that input information such as cargo numbers and destinations on logistics equipment such as containers and pallets that have been used for transportation of cargo by railways, trucks, container ships, etc., and storage in logistics warehouses, etc. A physical distribution system for mounting and managing cargo based on information input to the ID tag has been developed and put into practical use.

  For example, logistics equipment that loads cargo that has been transported to cargo terminals, wharfs, logistics warehouses, etc. is lowered to the ground using a cargo handling facility such as a large crane and transported to a specified location by a forklift. Input information (in this case, the load number) of the ID tag attached to the device is read by a tag reader mounted on the forklift. The read cargo number is collated with the database of the host computer, and information such as transportation destination and storage location is acquired. Then, based on the acquired information, each physical distribution device is transported to a place corresponding to the destination of the cargo.

  Reading by the tag reader is performed in a non-contact manner via a separately provided tag antenna, and information stored in an IC chip built in the ID tag is also used as an antenna built in the ID tag. Is transmitted to the tag antenna, and the signal received by the tag antenna is transmitted to the tag reader.

  Since the input information is read by transmitting / receiving radio waves in this way, in order to easily receive the signal of the ID tag attached to each physical distribution device, the left and right forks are inserted in the lower side of the physical surface of the physical distribution device. The tag antenna is arranged in the middle of the hole, and the tag antenna is arranged between the two forks in the lower central portion of the front surface of the lift bracket.

  In this way, by inserting the fork into the fork insertion hole of the physical distribution device, the tag antenna and the ID tag can be brought close to each other, and the information on the ID tag can be easily read.

  However, if the tag antenna is arranged as described above, the tag antenna may have to protrude forward from the front surface of the vertical portion of the fork, and the tag antenna may come into contact with the logistics equipment. .

  In order to avoid such contact between the tag antenna and the logistics equipment, the amount of insertion of the fork into the fork insertion hole of the logistics equipment can be adjusted so that there is a gap between them, but the amount of insertion The distance between the tag antenna and the physical distribution equipment, that is, the distance between the tag antenna and the ID tag varies, and stable reading may not be performed and reading accuracy may deteriorate.

  Therefore, the distance between the ID tag and the tag antenna is fixed by fixing the gap between the vertical part of the fork and the logistics equipment by attaching a stopper with a contact plate in front of the logistics equipment side surface to the fork. There is something that suppresses the variation of.

By the way, a stopper that can adjust the insertion amount of the fork has already been disclosed (see, for example, Patent Document 1). As a stopper mounted on a fork of a forklift provided with a tag antenna, a stopper 101 as shown in FIG. 5A has been put into practical use. This stopper 101 is provided with a contact plate 102 in surface contact with the logistics equipment side surface.
JP 2000-118985 A (page 3 and FIG. 6)

  However, if the stopper 101 as described above is attached to the fork F, when the fork F is inserted into the fork insertion hole C1 of the logistics equipment, the vertical equipment corners of the stopper 101 may damage the logistics equipment or cargo. May end up.

  That is, when the fork F is inserted into the fork insertion hole C1 of the logistics equipment (in this case, the container C), it is difficult to accurately operate the fork horizontal portion Fh and the fork insertion hole C1 in parallel. Insert F tilted slightly forward.

  In this way, when the fork F is tilted forward and the tip is slightly lowered, the stopper 101 is inclined forward, and the corner of the vertical portion, that is, the upper end corner on the front side, is on the side or load of the logistics equipment. This is because they come into contact (see FIG. 5B).

  Therefore, the present invention is for a fork capable of improving the reading accuracy of an ID tag attached to a physical distribution device such as a container or a pallet to be transported by a forklift or a load loaded thereon without damaging the physical load. The purpose is to provide a stopper.

In order to solve the above problems, the fork stopper according to claim 1 is provided with a tag antenna capable of communicating with a non-contact ID tag attached to a logistics device such as a container or a pallet on the front surface of the lift bracket. and has a fork stopper attached to the fork of the forklift, which was constructed in cross-section of U-shaped by placing the plate on three sides of the front-right side, left side, from the front fork vertical portion Idaku The front plate is disposed on the upper side of the lower contact plate and a lower contact plate that is parallel to the vertical portion of the fork when attached to the fork. The upper inclined plate provided in a state of being inclined rearward, the lower contact plate is a contact surface to the load parallel to the vertical portion of the fork , the upper inclined plate, in front It is characterized in that the abutment surface continues from the inclined surface which is inclined rearwardly constitute respectively. The package indicates a physical distribution device to which an ID tag is attached.

According to the fork stopper according to claim 1, by providing the inclined surface (upper inclined plate) on the upper front side , the impact of the stopper when contacting the physical distribution device is mitigated to damage the physical distribution device or cargo. It is possible to improve the reading accuracy of the ID tag attached to the logistics equipment.

  That is, when the fork is inserted into a fork insertion hole (hereinafter simply referred to as an insertion hole) of a physical distribution device, the fork tip is slightly lowered in order to facilitate insertion. Together, the posture is inclined forward.

When the fork is inserted into the insertion hole in this state, the boundary portion between the inclined surface (upper inclined plate) and the abutting surface (lower abutting plate) of the stopper first comes into contact with the side of the physical distribution equipment. The impact at the time can be reduced. In addition, a gap is formed between the upper end corner of the stopper and the side of the logistics equipment, and these do not come into contact with each other, so that the logistics equipment is not damaged.

Then, the front end of the fork is returned to the original position so that the horizontal portion of the fork is parallel to the ground, and the contact surface (lower contact plate) on the lower front surface of the stopper is brought into surface contact with the side surface of the logistics equipment. In this case, a predetermined gap can be provided between the vertical portion of the fork and the side of the physical distribution equipment so that the tag antenna and the physical distribution equipment do not interfere with each other. Moreover, since this gap does not change even when other logistics equipment is placed on the fork, the difference in distance between the tag antenna and the ID tag attached to each logistics equipment can be suppressed, and stable ID This is because the tag can be read.

  In the case where the fork is inserted into the insertion hole of the physical distribution equipment with the horizontal portion of the fork parallel to the ground as much as possible, the stopper makes the contact surface come into surface contact with the side of the physical distribution equipment. In this state, the physical distribution equipment is contacted, so that the impact at the time of contact can be reduced and damage to the physical distribution equipment can be prevented.

  Furthermore, in this case, the inclined surface can also be used as a guide when the physical distribution equipment is placed on the fork.

  That is, when the fork is inserted into the insertion hole of the physical distribution equipment, the height is adjusted so that the inclined surface is positioned at the upper edge of the opening of the insertion hole. Next, the fork is inserted to bring the inclined surface of the stopper into contact with the upper edge of the opening of the insertion hole. In this state, by raising the fork so that the inclined surface and the contact surface of the stopper are along the upper edge of the opening of the insertion hole, the contact surface of the stopper and the side surface of the logistics device can be easily obtained. And a predetermined gap can be provided between the fork vertical part and the side of the physical distribution equipment.

  The fork stopper according to claim 2 is characterized in that the fork stopper is attached by connecting the rear end portions of the left and right sides with bolts.

  According to such a fork stopper as claimed in claim 2, the fork can be attached and detached while being attached to the lift bracket, and since the rear end portions on both the left and right sides are attached by bolt connection, it can be attached and detached. It is easy to perform maintenance such as replacement in case of aging or damage due to wear.

The fork stopper according to claim 3 is attached to a fork of a forklift in which a tag antenna capable of communicating with a non-contact ID tag attached to a logistics device such as a container or a pallet is provided on the front surface of the lift bracket. A fork stopper having a U-shaped cross-sectional shape and having a main body portion including a front plate made of a single abutting plate, and is mounted in a state where it is held in the vertical portion of the fork from the front. A connecting member in which a front surface of the contact plate constitutes a contact surface to a load parallel to the vertical portion of the fork, and the main body portion connects lower rear end portions on both sides. It is characterized in that it is connected to the vertical portion of the fork so as to be rotatable in the vertical direction around the center. The package indicates a physical distribution device to which an ID tag is attached.

  According to the fork stopper of the third aspect, it is possible to improve the reading accuracy of the ID tag attached to the physical distribution device while preventing the physical distribution device from being damaged by the upper end corner on the front side. The package indicates a physical distribution device to which an ID tag is attached.

  In other words, when the fork is inserted into the fork insertion hole of the physical distribution device with the tip slightly lowered, the main body portion is inclined forward with the inclination of the fork. The upper end corner comes into contact. When the upper corners come into contact, the main body portion starts to rotate upward around the connecting member connecting the lower rear ends of both sides, and the impact can be mitigated to prevent damage to logistics equipment. it can.

  Then, when the contact surface of the main body part comes into surface contact with the side surface of the physical distribution equipment, the tip of the fork is raised to make the fork horizontal portion parallel to the ground. As a result, a predetermined gap can be provided between the fork vertical portion and the side of the physical distribution device so that the tag antenna and the physical distribution device do not interfere with each other.

  Since this gap does not change even when another physical distribution device is placed on the fork, the gap between the tag antenna and the ID tag attached to each physical distribution device is the same as the operation of the fork stopper according to claim 1. A difference in distance can be suppressed, and stable ID tag reading can be performed.

  The use of the fork stopper of the present invention, which has the above-described means, makes it possible to work with peace of mind without damaging distribution equipment such as containers and pallets and cargo, and the tag antenna and ID tag. Since the distance to the ID is constant, the ID tag reading accuracy is high, and it is difficult to make mistakes such as mistaken transportation destinations, so that smoother work can be performed and the efficiency of the logistics system managed using the ID tag Can be achieved.

  Further, when the fork stopper of the present invention is used, even an unskilled person can lift up without damaging physical distribution equipment or loaded cargo. Moreover, since the work can be performed easily, it is possible to perform safe and reliable cargo handling work in a short time without requiring time even for non-experts and to keep the manufacturing cost low due to the simple structure. Can do.

  Embodiments of a fork stopper according to the present invention will be described below with reference to FIGS.

  FIG. 1A is a perspective view of a fork stopper, and FIG. 1B is a partially enlarged side view of the fork showing a mounting state of the fork stopper. 2A is a side view of the forklift with the stopper attached to the fork, and FIG. 2B is a partially enlarged view of the lift bracket as viewed from the front. FIGS. 3A to 3C are explanatory views showing the action of the stopper, and show a partially enlarged view of the side surface of the fork.

  This fork stopper 1 (hereinafter also simply referred to as “stopper 1”) is configured by arranging plate materials on the three surfaces of the front surface, the right side surface, and the left side surface so that the cross-section has a U-shape. The front plate is disposed on the upper side of the lower contact plate 2a and the lower contact plate 2a which is parallel to the vertical portion of the fork when attached to the fork, and is provided in a state of being inclined rearward. It consists of two pieces with the upper inclined plate 2b. A notch 2c is formed in the lower part of the lower contact plate 2a.

  The left and right side plates 3 and 4 are formed so as to be bilaterally symmetric using a vertically long rectangular plate material, and are arranged with an interval approximately equal to the width of the vertical portion of the fork. The length in the vertical direction is set so that the lower end surface is positioned below that of the lower contact plate 2a, and the lower end surface of each side plate 3 and 4 and the lower contact plate 2a. A step D is provided between the lower end surface of each of the two.

  Each of the side plates 3 and 4 is obliquely cut at the front upper portion and is provided with an inclined portion 3c at the same angle as the upper inclined plate 2b. The side plate 3 is provided at the upper end portion and the lower end portion of the rear end portion. A substantially rectangular plate-shaped connecting piece 3a or 4a, in which bolt holes 3b and 4b are formed in the center, for connecting between the two is provided in a state of protruding rearward.

  As shown in FIG. 1B, the stopper 1 having such a shape is fitted into the fork F from the front so that the left and right side plates 3 and 4 sandwich the fork vertical portion Fv, and the upper end portion of the upper inclined plate 2b is vertically connected to the fork. The lower end surface of the lower contact plate 2a is brought into contact with the upper surface of the fork horizontal portion Fh.

  Then, long bolts B are inserted into the bolt holes 3b and 4b of the connecting pieces 3a and 4a of the side plates 3 and 4 separately from each other, and then nuts (not shown) are screwed together to screw the left and right side plates 3 and 4 together. Is fastened with a bolt B, and the stopper 1 is fixed in a state of being held in the fork vertical portion Fv. The bolt B is inserted through a collar (not shown) between the connecting pieces 3a and 4a of the side plates 3 and 4.

In this way, the forklift 11 in which the stopper 1 is attached to the fork F is provided with pillars 14 on the front, rear, left and right sides of a driver's seat 13 provided on the vehicle body frame 12, and four corners are supported on the upper ends of the pillars 14 to cover the head cover. 15 is attached.

  A mast 17 that can be tilted in the front-rear direction by the expansion and contraction of the hydraulic cylinder 16 is disposed at the front portion of the vehicle body frame 12, and a lift bracket 18 that is attached to the front surface of the mast 17 so as to be movable up and down. A book fork F is slidably mounted in the lateral direction.

  In addition to the two forks F, a tag reader TR and a tag antenna TA are attached to the lift bracket 18. The tag reader TR is disposed on the upper side of one side member of the lift bracket 18 and is connected to a power feeding cable 22.

  The tag antenna TA is disposed on the outer side of the left and right vertical members 19 disposed in the central portion in the horizontal direction. The tag antenna TA is disposed on the lower fork bar 20 between the vertical member 19 and the side members on the left and right sides. Two units are arranged.

  One of these tag antennas TA is attached to the lower end portion of the lower fork bar 20, and the tag antenna TA is mounted with its mounting surface facing downward and at a right angle to the front surface of the lower fork bar. It is attached to the tag antenna bracket 21. When the forklift 11 is viewed from the side, these tag antennas TA are partially protruded forward from the front surface of the fork vertical portion Fv (see FIG. 1B).

  On the other hand, the other two units are similarly attached to the lower end portion of the lower fork bar 20, and the tag antenna TA is disposed in a state in which the attachment surface of the tag antenna TA is directed forward and parallel to the front surface of the lower fork bar. The bracket 21 is attached.

  Next, the operation of the stopper 1 will be described by taking the case of transporting the container C as an example.

  When the container C is transported by the forklift 11, the fork 11 is inserted into the fork insertion hole C1 (hereinafter also simply referred to as the insertion hole C1) at the lower part of the container, and the lift bracket 18 is raised to raise the fork F. However, when the fork F is inserted into the insertion hole C1, it is difficult to make the fork horizontal portion Fh and the insertion hole C1 parallel to each other. Therefore, the mast 17 is slightly inclined forward. Lower the tip of F slightly. As a result, the stopper 1 is inclined slightly forward as the fork F is inclined.

In this state, the forklift 11 is advanced, and the fork F is inserted into the insertion hole C1 until the stopper 1 comes into contact with the container C as shown in FIG. At this time, since the boundary portion B between the upper inclined plate 2b and the lower contact plate 2a of the stopper 1 contacts the side surface of the container C, the impact at the time of contact is reduced. In addition, a gap S1 is formed between the upper end corner on the front side of the stopper 1 and the side surface of the container C, and damage due to the upper end corner on the front side of the stopper 1 can be avoided.

Then, the mast 17 is returned, the tip of the fork F is raised, and the lower contact plate 2a of the stopper 1 is brought into surface contact with the side surface of the container C. Then, as shown in FIG. 3 (b), a gap S2 is formed between the side surface of the container C and the fork vertical portion Fv so that the tag antenna TA and the container C do not interfere with each other.

The gap S2 does not change even when another container is placed on the fork F, and the difference in distance between the ID tag of each container and the tag antenna TA of the forklift 11 can be suppressed. When the ID tag T attached to the lower side of the side is read, stable reading can be performed, and the reading accuracy of the ID tag T can be improved. The container ID tag T is disposed between the left and right insertion holes C1, and is disposed at a position slightly closer to the end from the intermediate portion.

  Incidentally, in the ID tag T, an induced electromotive force is generated by the radio wave transmitted from the tag antenna TA, and the information (in this case, the container number) of a built-in IC chip (not shown) is also generated by the induced electromotive force. Is transmitted from an antenna (not shown). The signal is received by the tag antenna TA and transmitted to the tag reader TR, and the container number information is transmitted from the tag reader TR to the host computer and collated with a database to obtain information on cargo such as storage period and transportation destination.

  Based on the load information thus obtained, the lift bracket 18 is raised and the container C is lifted up and transported to a predetermined location. In addition, if the mast 17 is inclined slightly rearward and the tip of the fork F is raised, the container C is less likely to slide off the fork F, and can be transported safely.

  The upper inclined plate 2b of the stopper 1 can also be used as a guide for the container C. In this case, as shown in the partially enlarged view of FIG. 3C, it is convenient and easy to work if the upper inclined plate 2b is made slightly longer.

  When the fork F is inserted into the insertion hole C1, the mast 17 is not tilted so that the fork horizontal portion Fh is in parallel with the ground as much as possible. Adjustment is made so that the inclined plate 2b is positioned at the upper edge of the opening of the insertion hole C1.

  Next, the fork F is inserted so that the upper inclined plate 2b of the stopper 1 is in contact with the upper edge of the opening of the insertion hole C1.

In this state, the fork F is raised so that the upper inclined plate 2b and the lower contact plate 2a are along the upper edge of the opening of the insertion hole C1. Then, the side surface of the container C and the lower contact plate 2a of the stopper 1 can be brought into surface contact with each other, and a gap S2 can be provided between the container C and the fork vertical portion Fv.

  The stopper 1 can be easily removed from the fork vertical portion Fv while the fork F is attached to the lift bracket 18 by removing the upper and lower bolts B on the rear side.

  Next, another embodiment will be described with reference to FIG.

  The stopper 1 ′ includes a main body portion 11 ′ in which the front plate is composed of a single abutting plate 2 a ′ without providing the upper inclined plate 2 b in the stopper 1, and the fork so as to be rotatable in the vertical direction. It is connected to the vertical part Fv.

  This stopper 1 'is a U-shaped support member having a U-shape in plan view, provided separately by fixing the lower bolt B connecting the left and right side plates to the fork vertical portion Fv from the front. It is connected to the fork F in a state of being inserted through through holes 21a ′ at the rear end portions on both sides of 21 ′, and the main body portion 11 ′ is rotatable in the vertical direction around the bolt B.

  Next, the operation of the stopper 1 'will be described in the case where the container C is lifted up by the fork F.

  Before the fork F is inserted into the insertion hole C1, the tip of the fork F is slightly lowered to facilitate the insertion work. Then, the stopper 1 ′ is also tilted forward in accordance with the inclination of the fork F.

  When the fork F is inserted into the insertion hole C1, as shown in FIG. 4A, the stopper 1 ′ immediately rotates upward when the upper end corner on the front side comes into contact with the side surface of the container C. The impact when the upper end corner of the front side of 'comes in contact is alleviated and the container C is not damaged.

  When the contact plate 2a ′ comes into surface contact with the side surface of the container C (see FIG. 4B), the fork F is lifted up so that the fork horizontal portion Fh is substantially horizontal with respect to the ground. However, since the stopper 1 ′ is rotatable, the contact plate 2a ′ is kept in surface contact with the side surface of the container C while the fork F is returned to its original position.

Thus, as shown in FIG. 4 (c), the stopper 1 'improves the reading accuracy of the ID tag T while avoiding interference between the tag antenna TA and the container C between the fork vertical part Fv and the container C side surface. A gap S2 that can achieve the above is formed.

  Since such a stopper 1 'has a simple structure, it is possible to achieve both the objectives of logistics equipment and cargo protection and improvement of ID tag reading accuracy at low cost.

(A) is a perspective view which shows the stopper for forks which concerns on this invention, (b) is the partial expanded side view of the fork which shows the attachment state of a stopper. (A) is a side view of a forklift with a fork stopper according to the present invention attached to the fork, and (b) is a front view of the forklift and is a partially enlarged view showing a lift bracket. It is explanatory drawing which shows the effect | action of the stopper for forks which concerns on this invention, (a) has shown the state which inserted the fork into the fork insertion hole of the container, and contact | abutted the container side surface, (b) lifts up a container. (C) shows a state in which a fork used as a guide is inserted into the insertion hole. It is explanatory drawing which shows the effect | action of the stopper for forks which concerns on another Example of this invention, and has shown the state which inserted the fork into the fork insertion hole of the container, (a) is in the state which the stopper contacted the container, (B) is the state which the contact plate of the stopper contact | abutted to the container side surface, (c) is the elements on larger scale which show the case where an upper inclination board is used as a guide. (A) has shown the elements on larger scale of the fork side surface which shows the attachment state of the conventional stopper for forklifts. (B) has shown the effect | action of a stopper, and is a side view which shows the state at the time of inserting the fork of (a) into the fork insertion hole of a container.

Explanation of symbols

1, 1 'Fork stopper 2a Lower abutment plate 2b Upper inclined plate 3, 4 Side plate 3a, 4a Connecting piece 3a, 4b Bolt hole 3c Inclined portion 18 Lift bracket 19 Vertical member 20 Lower fork bar F Fork T ID tag TA tag Antenna TR Tag reader 11 'Body part

Claims (3)

A fork stopper attached to the fork of a forklift in which a tag antenna capable of communicating with a non-contact ID tag attached to a logistics device such as a container or a pallet is disposed on the front surface of the lift bracket,
The plate is arranged on the front, right side, and left side and configured in a U-shaped cross section. It is attached to the vertical part of the fork from the front .
When the front plate is attached to the fork, the lower contact plate is parallel to the vertical portion of the fork, and the upper plate is disposed on the upper side of the lower contact plate and is inclined rearward. It consists of two pieces with an inclined plate,
The lower contact plate constitutes a contact surface for a load parallel to the vertical portion of the fork , and the upper inclined plate constitutes an inclined surface inclined rearward from the contact surface. Characteristic fork stopper.   2. The fork stopper according to claim 1, wherein the fork stopper is attached by connecting bolts between rear end portions of the left and right sides. A fork stopper attached to the fork of a forklift in which a tag antenna capable of communicating with a non-contact ID tag attached to a logistics device such as a container or a pallet is disposed on the front surface of the lift bracket,
It has a U-shaped cross-sectional shape and has a main body part in which the front plate is composed of a single abutment plate, and is attached in a state where it is held in front of the fork vertical part ,
The front surface of the contact plate constitutes a contact surface to a load parallel to the vertical portion of the fork,
The fork stopper is characterized in that the main body portion is connected to the vertical portion of the fork so as to be rotatable in the vertical direction around a connecting member connecting the lower rear end portions on both sides.

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