JP7475098B1 - Truck Hand Lifter - Google Patents

Abstract

[Problem] To provide a hand lifter for trucks that allows a loading and unloading worker to easily move a pallet loaded on one side of a truck to the opposite side of the truck without climbing onto the truck bed. [Solution] The hand lifter for trucks 1 has a rod-shaped rod portion 11, a grip portion 12 connected to one end of the rod portion 11 and for a loading and unloading worker to grip, a fork attachment portion 13 connected to the other end of the rod portion 11, a pair of fork portions 14 extending from the fork attachment portion 13 so that the angle θ formed with the rod portion 11 is an obtuse angle, a pair of tip claw portions 15 provided at each tip of the pair of fork portions 14, and a pair of casters 16 attached to a pair of caster attachment portions 160 connected to at least the other end of the rod portion 11. The pair of fork portions 14 are inserted into any one of a plurality of insertion openings on the pallet into which the forks of a forklift are inserted. [Selected Figure] Figure 3

Description

The present invention relates to a hand lifter for trucks.

Conventionally, when transporting goods by truck, multiple pallets loaded with goods are usually loaded onto the bed of the truck for transport. Wing trucks, whose bed sides (side panels) open to the left and right like a bird with its wings spread, are known as trucks capable of loading multiple pallets loaded with goods onto the bed. In this type of truck, the left and right side panels are generally opened, and pallets are loaded and unloaded from each of the left and right side panels using a forklift.

The prior patent document 1 discloses a manual pallet moving dolly that is not for trucks, but has a load-receiving fork on the front that can be inserted into the groove of the pallet by hand. This manual pallet moving dolly has a main body frame that constitutes the main body of the dolly, a fork support section that is connected to the main body frame section and inserts and fixes the fork in the vehicle length direction, a fork section that supports the pallet so that the end that is not inserted and fixed to the fork support section is inserted into the groove of the pallet so that the pallet can be raised and lowered, a hand handle section that is provided on the main body frame section at the end different from the fork section and has a pair of left and right handles, a load receiving platform section that is connected to the main body frame section and is located between the hand handle section and the fork support section, a wheel section that is rotatably attached to a wheel support section that is installed on the bottom side of the main body frame section of the fork support section, and a V-shaped leg section that is installed on the bottom side of the main body frame section of the load receiving platform, and the fork is configured with a bent fork, and the wheel section is configured with two wheels.

Utility Model Registration No. 3167528

When unloading multiple pallets from the bed of a truck in a narrow space where only one of the left and right side panels can be opened, it is necessary to unload the pallets as follows.

First, all the pallets stacked in a row on one of the open side panels are unloaded using a forklift. Next, to unload the pallets stacked on the other side of the closed side panel, the forklift forks cannot reach them, so the unloading operation is temporarily stopped and the truck is turned so that the closed side panel is on the forklift operation side (so that the front and rear of the truck are facing in the opposite direction). The closed side panel is then opened, and all the pallets stacked in a row on this side are unloaded using a forklift.

This makes unloading extremely inefficient and time-consuming. In addition, after unloading the pallets loaded on one of the open side panels, it is possible for a loading worker to climb onto the loading platform and use a crowbar or similar tool to move the pallets at the back (the pallets loaded on the closed side panel side) to the front (the side panel that was opened first) without turning the truck around, but this type of work also reduces the efficiency of unloading.

In addition, multiple pallets loaded with cargo are generally stacked close together on a loading platform, and cargo on adjacent pallets may be intentionally placed in contact with each other to prevent the cargo from shifting. Large cargo protruding from the pallet may also interfere with cargo on adjacent pallets. In such cases, it is difficult to move the pallet all the way to the front by simply pulling it straight towards you, due to the cargo touching and interfering with each other. In particular, if the cargo on the pallet is wrapped in plastic to prevent it from shifting, the plastic sticking together makes it even more difficult to move the pallet.

The manual pallet moving cart described in Patent Document 1 is not designed for trucks, and it is difficult for a loading and unloading worker underneath the bed to move a pallet loaded on the bed of a truck.

The present invention was made in consideration of such problems, and aims to provide a hand lifter for trucks that enables loading and unloading workers to easily move pallets loaded on one side of a truck from the other side to the front without having to climb onto the truck bed.

The truck hand lifter according to the present invention is as follows:

[1]
A truck hand lifter used by a loading worker under a truck bed to move a pallet loaded on the bed,
A rod-shaped portion;
A gripping portion connected to one end of the rod-shaped portion and adapted to be gripped by the cargo handling worker;
a fork attachment portion connected to the other end of the rod-shaped portion;
a pair of fork portions extending from the fork attachment portion so as to form an obtuse angle with the rod-shaped portion, the pair of fork portions being inserted into any one of a plurality of insertion openings in the pallet into which forks of a forklift are inserted;
A pair of tip claws are provided at the respective tips of the pair of fork parts and are adapted to hook onto a part of the pallet in an internal space communicating with the insertion port of the pallet;
At least a pair of caster attachment parts connected to the other end of the rod-shaped part, or a pair of casters attached to the fork attachment part;
having
Hand lifter for trucks.

[2]
The pair of caster attachment parts are constituted by a pair of caster angle members each having an L-shaped cross section,
One of the mountain side surfaces of each of the caster angle members is connected to the rod-shaped portion,
Each of the casters is attached to the other crest side of each of the caster angle members.
The hand lifter for trucks according to [1].

[3]
The pair of fork portions are each made of a square tube member for a fork,
The pair of tip claws are provided to close the tip openings of the respective fork square tube members.
The hand lifter for a truck according to [1] or [2].

[4]
The casters are detachably attached to the caster attachment parts.
The hand lifter for a truck according to any one of [1] to [3].

[5]
The caster has a caster fork supporting a caster wheel fastened to the caster angle member by a fastening member.
The hand lifter for trucks according to [2].

[6]
a reinforcing portion disposed between the pair of fork portions and connected to the pair of fork portions;
The hand lifter for a truck according to any one of [1] to [5].

[7]
The reinforcing portion is further connected to the fork mounting portion.
The hand lifter for a truck according to any one of [1] to [6].

[8]
The caster mounting portion is disposed below the fork mounting portion.
The hand lifter for a truck according to any one of [1] to [7].

[9]
The gripping portion is connected to the circumferential surface of the rod-shaped portion.
The hand lifter for a truck according to any one of [1] to [8].

[10]
The rod-shaped portion is made of a rod-shaped rectangular tube member,
The gripping portion is connected to an upper surface of the circumferential surface of the rod-shaped portion square tube member.
The hand lifter for a truck according to any one of [1] to [9].

[11]
The fork attachment portion is composed of a fork attachment angle member having an L-shaped cross section,
The base end of each of the fork portions is connected to one of the crest sides of the fork mounting angle member.
The hand lifter for a truck according to any one of [1] to [10].

The truck hand lifter described in [1] above has the above configuration. Therefore, according to the truck hand lifter described in [1] above, a loading worker can move a pallet as follows without climbing onto the truck bed. That is, by operating the truck hand lifter described in [1] above from under the truck bed, inserting a pair of fork parts into one of the multiple insertion openings into which the forks of a forklift are inserted on the pallet at the back side to be unloaded, and hooking the pair of tip claw parts onto a part of the pallet, the loading worker can pull the gripping parts straight toward him while lifting the front side of the pallet, or by moving the pallet slightly diagonally so that the loads on adjacent pallets move away from each other, and then pulling the gripping parts straight toward him, the pallet can be pulled out to the edge of the bed on the forklift operation side by pulling the gripping parts straight toward him.

Therefore, with the truck hand lifter described in [1] above, a loading and unloading worker can easily move a pallet loaded on one side of a truck from the other side to the front without having to climb onto the truck bed.

The truck hand lifter described in [2] above has the above configuration, and thus allows a pair of casters to be arranged in a concentrated manner near the other end of the rod-shaped portion via a pair of caster attachment parts composed of a pair of caster angle members with an L-shaped cross section.

Therefore, with the hand lifter for trucks described in [2] above, after the pair of tip claws are hooked onto a part of the pallet to lift the front side of the pallet, the gripping part can be moved left or right to easily rotate the tips of the pair of fork parts to the right or left, approximately centered on the pair of caster parts. Therefore, with the hand lifter for trucks described in [2] above, it becomes easier to move the pallets slightly diagonally so that the loads on adjacent pallets move away from each other, enhancing the effectiveness of the hand lifter for trucks described in [1] above.

The truck hand lifter described in [3] above has the above configuration, which can increase the connection strength between the fork section made of the fork square tube member and the tip claw section. Therefore, the truck hand lifter described in [3] above can improve the connection reliability between the fork section and the tip claw section compared to when the tip claw section is provided at the tip of the fork section made of plate material.

In addition, the truck hand lifter described in [3] above has a pair of fork parts both made of square tube members for forks, so the bending rigidity of the fork parts can be increased compared to when the pair of fork parts are both made of plate material. The configuration of the truck hand lifter described in [3] above is particularly useful for truck hand lifters that frequently handle relatively heavy pallets loaded with cargo.

The truck hand lifter described in [4] above has casters detachably attached to the caster mounting parts, making it easy to remove casters that have deteriorated with use from the caster mounting parts and replace them with new casters. This configuration is particularly useful for truck hand lifters that frequently handle relatively heavy pallets loaded with cargo.

The truck hand lifter described in [5] above has the above configuration, so that the caster angle members and the casters can be easily attached and detached via the fastening members.

Therefore, according to the truck hand lifter described in [5] above, casters that deteriorate with use can be easily replaced, improving the maintainability of the truck hand lifter.

The truck hand lifter described in [6] above has a reinforcing part disposed between and connected to a pair of fork parts, thereby making it possible to increase the durability of each fork part extending from the fork mounting part against external forces acting inward, outward, upward, downward, etc., compared to a case without a reinforcing part.

Therefore, the truck hand lifter described in [6] above can improve the connection reliability between the fork mounting part and the pair of fork parts. This configuration is particularly useful for truck hand lifters that frequently handle relatively heavy pallets loaded with cargo.

The truck hand lifter described in [7] above has a reinforcing part that is also connected to the fork mounting part, thereby enhancing the effect of the truck hand lifter described in [6] above.

The truck hand lifter described in [8] above has the caster attachment part located below the fork attachment part, which has the advantage that the caster can be easily positioned at the fulcrum position of the lever.

The truck hand lifter described in [9] above has a gripping portion connected to the circumferential surface of the rod-shaped portion, which has the advantage that it is easier to connect the rod-shaped portion and the gripping portion when manufacturing the truck hand lifter, compared to when the gripping portion is connected to the end surface of the rod-shaped portion.

The truck hand lifter described in [10] above has a gripping part connected to the upper surface of the periphery of the rod-shaped part made of a rod-shaped part square tube member. This makes it easier to reduce the load on the connection between the rod-shaped part and the gripping part when a loading and unloading worker applies a downward force to the gripping part, compared to when the gripping part is connected to the end surface of the rod-shaped part, and therefore makes it possible to increase the reliability of the connection between the rod-shaped part and the gripping part.

The truck hand lifter described in [11] above has the above-mentioned configuration, which has the advantage that it is easy to connect the base end of each fork section to the fork mounting angle member when manufacturing the truck hand lifter.

FIG. 1 is a front view of a hand lifter for a truck according to the present embodiment. FIG. 2 is a rear view of the hand lifter for a truck according to this embodiment. FIG. 3 is a left side view of the hand lifter for a truck according to this embodiment. FIG. 4 is a right side view of the hand lifter for a truck according to this embodiment. FIG. 5 is a plan view of the hand lifter for a truck according to this embodiment. FIG. 6 is a bottom view of the hand lifter for a truck according to this embodiment. FIG. 7 is an enlarged view of a part of a left side view of the hand lifter for a truck according to this embodiment. FIG. 8 is an enlarged view of a part of a plan view of the hand lifter for a truck according to this embodiment. FIG. 9 is an enlarged view of a part of a bottom view of the hand lifter for a truck according to this embodiment. FIG. 10 is a reference diagram showing an example of a state in which a pair of tip claw portions are hooked onto a part of a pallet in an internal space communicating with the insertion port of the pallet, using an example truck hand lifter according to the truck hand lifter of this embodiment. FIG. 11 is a reference diagram showing an example in which a pair of fork parts is inserted into one of two insertion openings (the right-side insertion opening) on the front side of a pallet into which the forks of a forklift are inserted, using an example truck hand lifter according to the truck hand lifter of this embodiment, to lift the front side of the pallet.

The hand lifter for trucks of this embodiment will be described in detail below with reference to the drawings. The hand lifter for trucks of this embodiment is not limited to the following examples. In the following description, the front side as seen from the loading and unloading worker when using the hand lifter for trucks is the front (rear side) of the hand lifter for trucks, the rear side as seen from the loading and unloading worker when using the hand lifter for trucks is the rear (near side) of the hand lifter for trucks, the right side as seen from the loading and unloading worker when using the hand lifter for trucks is the right side of the hand lifter for trucks, and the left side as seen from the loading and unloading worker when using the hand lifter for trucks is the left side of the hand lifter for trucks.

As illustrated in Figs. 1 to 9, the truck hand lifter 1 of this embodiment has a rod-shaped portion 11, a gripping portion 12, a fork attachment portion 13, a pair of fork portions 14, a pair of tip claw portions 15, and a pair of casters 16. The truck hand lifter 1 is used by a loading worker under the bed of the truck to move a pallet loaded on the bed. The pallet to be moved may or may not be loaded with luggage. Furthermore, the truck hand lifter 1 may be used by a loading worker to climb onto the bed of the truck to move a pallet, as long as the loading worker under the bed of the truck can move the pallet loaded on the bed.

The rod-shaped portion 11 has a rod shape. The rod-shaped portion 11 can be made of a metal material such as steel, and may be hollow or solid. From the viewpoint of weight reduction and strength of the truck hand lifter 1, the rod-shaped portion 11 can be preferably made of a hollow material. In this embodiment, the rod-shaped portion 11 is specifically made of a square tube member. The square tube member has a square cross section. When the rod-shaped portion 11 is made of a square tube member, there is an advantage that other members such as the grip portion 12, the fork mounting portion 13, and the caster mounting portion 160 (described later) can be easily connected to each side. The square tube member that makes up the rod-shaped portion 11 is sometimes called a square tube member for rod-shaped portions.

The gripping portion 12 is a portion for a loading and unloading worker to grasp, and is connected to one end of the rod-shaped portion 11. The gripping portion 12 can be made of a metal material such as steel, and may be hollow or solid. From the viewpoint of weight reduction and strength of the truck hand lifter 1, the gripping portion 12 is preferably made of a hollow material. In this embodiment, the gripping portion 12 is made of a round tube member. The round tube member has a circular cross section. When the gripping portion 12 is made of a round tube member, there is an advantage that the loading and unloading worker can easily hold it in his/her hand because there are no corners. The round tube member that constitutes the gripping portion 12 is sometimes called a round tube member for gripping portion.

In this embodiment, the gripping portion 12 can be connected to the circumferential surface of the rod-shaped portion 11 at one end of the rod-shaped portion 11. Specifically, the gripping portion 12 can be connected to the upper surface of the circumferential surface of the rod-shaped portion square tube member that constitutes the rod-shaped portion 11. The upper surface refers to the surface of the circumferential surface of the rod-shaped portion square tube member that is located on the upper side when a loading and unloading worker uses the truck hand lifter 1.

More specifically, the round tube member for the gripping portion constituting the gripping portion 12 can be connected at its longitudinal center to the upper surface of the peripheral surface of the square tube member for the rod-shaped portion. In this case, as illustrated in each figure, the round tube member for the gripping portion constituting the gripping portion 12 and the square tube member for the rod-shaped portion constituting the rod-shaped portion 11 form an overall substantially T-shaped shape on the gripping portion 12 side of the truck hand lifter 1. The configuration in which the longitudinal center of the gripping portion 12 is connected to the rod-shaped portion 11 has the advantage that when a loading and unloading worker uses the truck hand lifter 1, the loading and unloading worker can easily grasp the part of the gripping portion 12 on the right side of the rod-shaped portion 11 with his right hand and the part of the gripping portion 12 on the left side of the rod-shaped portion 11 with his left hand.

The connection between the gripping portion 12 and the rod-shaped portion 11 can be achieved by, for example, welding, in terms of connection strength, etc.

The fork attachment portion 13 is connected to the other end of the rod-shaped portion 11. The fork attachment portion 13 is a portion that serves to attach the pair of fork portions 14 to the other end of the rod-shaped portion 11 with the pair of fork portions 14 spaced apart a predetermined distance in a direction substantially perpendicular to the longitudinal direction of the rod-shaped portion 11. The fork attachment portion 13 can be made of a metal material such as steel.

The fork mounting portion 13 can be made of, for example, an L-shaped cross-section member, a square tube member, a plate-shaped member, etc. From the viewpoints of reducing the weight of the truck hand lifter 1 and ease of connection to the pair of fork parts 14, etc., the fork mounting portion 13 can be made of an L-shaped cross-section member. In this embodiment, the fork mounting portion 13 is specifically made of an L-shaped cross-section angle member from the viewpoints of reducing the weight of the truck hand lifter 1, ease of connection to the pair of fork parts 14, ease of procurement of parts, etc. The L-shaped cross-section angle member that makes up the fork mounting portion 13 is sometimes called a fork mounting angle member.

In this embodiment, the fork mounting portion 13 is arranged to extend in a direction approximately perpendicular to the longitudinal direction of the rod-shaped portion 11, and can be connected to the other end of the rod-shaped portion 11 at the longitudinal center of the fork mounting portion 13. More specifically, the fork mounting angle member constituting the fork mounting portion 13 is arranged so that its two peak sides are on the outer side (upper side, forward side) (and its two valley sides are on the inner side (lower side, rear side)), and can be connected to the other end of the rod-shaped portion 11 at the longitudinal center of the fork mounting angle member.

In addition, at the connection portion between the fork mounting portion 13 and the other end of the rod-shaped portion 11, a groove is formed in the fork mounting portion 13 into which the other end of the rod-shaped portion 11 can be fitted, and the fork mounting portion 13 and the other end of the rod-shaped portion 11 can be connected with the other end of the rod-shaped portion 11 fitted into this groove. This configuration improves the connection strength between the fork mounting portion 13 and the other end of the rod-shaped portion 11. It also has the advantage of making it easier to ensure the angle θ (described later) between the pair of fork portions 14 and the rod-shaped portion 11. In this embodiment, specifically, an example is shown in which a groove is formed in the longitudinal center of the upper wall portion of the two wall portions of the fork mounting angle member.

The fork mounting portion 13 and the rod portion 11 can be connected by welding, for example, in terms of connection strength.

The pair of fork portions 14 extend from the fork attachment portion 13 so that the angle θ between the pair of fork portions 14 and the rod portion 11 is an obtuse angle. The size of the angle θ between the pair of fork portions 14 and the rod portion 11 can be understood, for example, from the left side view (right side view) of the truck hand lifter 1, as shown in FIG. 3 (FIG. 4). From the viewpoint of facilitating lifting of a pallet from under the bed of a truck using the principle of leverage, the angle θ between the pair of fork portions 14 and the rod portion 11 can be preferably 150° to 175°, more preferably 155° to 170°, and even more preferably 160° to 165°.

The pair of fork sections 14 are inserted into one of a number of slots on the pallet into which the forks of a forklift are inserted. That is, a pallet is usually rectangular in shape and has four side end faces. Of the four side end faces of a pallet, two opposing side end faces or each side end face generally have two slots, one on either side of a block body, into which the two forks of a forklift are inserted.

Specifically, in this embodiment, both fork parts 14 are inserted into one of two insertion openings formed on the side end face of the pallet on the side to be lifted. In other words, the pair of fork parts 14 are attached to the fork attachment part 13 so that the distance between the right edge of the fork part 14 located on the right side as seen from the loading and unloading worker's side and the left edge of the fork part 14 located on the left side is smaller than the opening width of one of the insertion openings formed on the side end face of the pallet.

In this embodiment, each fork portion 14 can be made of a metal material such as steel, and may be hollow or solid. Each fork portion 14 can be made of, for example, a square tube member, a round tube member, a rod-shaped member, a plate-shaped member, etc. Each fork portion 14 can be made of a hollow material, preferably from the viewpoint of reducing the weight and strength of the truck hand lifter 1. In this embodiment, each fork portion 14 is specifically made of a square tube member. The square tube member has a square cross section. When the fork portion 14 is made of a square tube member, it is easier to ensure the connection strength between the fork portion 14 and the tip claw portion 15, and it is easier to align the width of the fork portion 14 (the width of the square tube member) and the width of the tip claw portion 15, which reduces excess protrusions and improves the appearance. The square tube member that makes up the fork portion 14 is sometimes called a square tube member for forks.

In this embodiment, the square tube member for the fork and the square tube member for the rod portion can be configured to have the same size cross-sectional shape. With this configuration, the fork portion 14 and the rod portion 11 can be formed from the same material, which makes it possible to reduce material waste during the manufacture of the truck hand lifter 1 compared to when the fork portion 14 and the rod portion 11 are formed from different materials. This makes it easier to reduce the cost of the truck hand lifter 1.

In this embodiment, the base end of each fork portion 14 is specifically connected to one of the crest sides of the fork mounting angle member that constitutes the fork mounting portion 13. Note that, specifically, the connection between each fork portion 14 and the fork mounting portion 13 can be made by joining, for example, by welding, from the standpoint of connection strength, etc.

In this embodiment, a reinforcing portion 140 can be provided between the pair of fork portions 14. Specifically, the reinforcing portion 140 can be disposed between the pair of fork portions 14 and connected to the pair of fork portions 14. From the viewpoint of improving the connection strength between each fork portion 14 and the fork mounting portion 13, the reinforcing portion 140 can also be connected to the fork mounting portion 13.

In addition, the reinforcement portion 140 can be connected to each of the fork portions 14 and the fork mounting portion 13 by, for example, welding, in terms of connection strength, etc.

The pair of tip claws 15 are provided at the tips of the pair of fork parts 14 to hook onto a part of the pallet in the internal space that is connected to the insertion port of the pallet. Specifically, the tip claws 15 are provided at the tips of the fork parts 14 so that a part of the tip claws protrudes above the upper surface of the fork parts 14. In this case, the tip claws 15 can hook onto the upper wall of the internal space that is connected to the insertion port of the pallet. The tip claws 15 can be made of a metal material such as steel. In this embodiment, the tip claws 15 can be made of a plate-shaped member from the viewpoint of improving the hooking ability of the tip claws 15 onto a part of the pallet in the internal space that is connected to the insertion port of the pallet and improving the connectivity of the tip claws 15 to the tips of the fork parts 14.

In this embodiment, the pair of tip claws 15 can be provided to close the tip openings of the fork square tube members that make up each fork section 14. Specifically, the tip claws 15 and the fork sections 14 can be connected by, for example, welding, etc., from the standpoint of connection strength.

The pair of casters 16 has a role of easily dragging and moving the pallet lifted by the principle of leverage. The pair of casters 16 can be attached to at least a pair of caster attachment parts 160 connected to the other end of the rod-shaped part 11. In addition, although not shown, the pair of casters 16 may be directly attached to the fork attachment part 13. In this embodiment, as illustrated in each figure, the pair of casters 16 are attached via a pair of caster attachment parts 160 connected to the other end of the rod-shaped part 11. In this case, the caster attachment part 160 may be connected not only to the rod-shaped part 11 but also to the fork attachment part 13 from the viewpoint of improving the connection strength and the stability of the caster 16. The caster attachment part 160 can be disposed below the fork attachment part 13.

The caster mounting portion 160 can be made of, for example, a metal material such as steel. The caster mounting portion 160 can be made of, for example, an L-shaped cross-section member, a square tube member, a plate-shaped member, etc. The caster mounting portion 160 can be made of, preferably, an L-shaped cross-section member from the viewpoints of reducing the weight of the truck hand lifter 1 and ease of connection with the pair of fork portions 14. In this embodiment, the caster mounting portion 160 is specifically made of an L-shaped cross-section angle member from the viewpoints of reducing the weight of the truck hand lifter 1, ease of connection with the caster 16 and the rod-shaped portion 11, ease of procurement of the member, etc. The L-shaped cross-section angle member that constitutes the caster mounting portion 160 is sometimes called a caster angle member.

When a pair of caster mounting parts 160 are composed of a pair of caster angle members as in this embodiment, one crest side of each caster angle member constituting each caster mounting part 160 is connected to the rod-shaped part 11, and each caster 16 can be attached to the other crest side of each caster angle member. In this case, from the standpoint of connectivity with the rod-shaped part 11 and ease of attachment of the caster 16, one crest side of the caster angle member can be arranged to face the side of the rod-shaped part 11, and the other crest side of the caster angle member to which the caster 16 is attached can be arranged to face downward.

In addition, the end faces of the caster angle members constituting the caster mounting portion 160 can also be connected to the valley side of the fork mounting angle member constituting the fork mounting portion 13, from the viewpoint of connection strength of the caster mounting portion 160. Note that, specifically, from the viewpoint of connection strength, joining by welding, for example, can be used to connect the caster mounting portion 160 to the rod portion 11 and the fork mounting portion 13.

In this embodiment, the caster angle member and the fork mounting angle member can be configured to have the same sized cross-sectional shape. With this configuration, the caster mounting portion 160 and the fork mounting portion 13 can be formed from the same material, which makes it possible to reduce material waste during the manufacture of the truck hand lifter 1 compared to when the caster mounting portion 160 and the fork mounting portion 13 are formed from different materials. This makes it easier to reduce the cost of the truck hand lifter 1.

In this embodiment, the casters 16 are not particularly limited and can be appropriately selected from known general-purpose products. The casters 16 may be either fixed casters or swivel casters (free casters), but fixed casters are preferred from the viewpoint of ease of dragging and moving the pallet stably. The casters 16 usually have a caster fork 16b that rotatably supports the caster wheel 16a. Note that a mounting seat (top plate) or the like may be provided on the top surface of the caster fork 16b as necessary.

In this embodiment, it is preferable that the caster 16 is detachably attached to the caster attachment portion 160 from the viewpoint of easily replacing the caster 16. Specifically, the caster 16 can be fastened by a fastening member 161 to the caster fork 16b supporting the caster wheel 16a and the caster angle member. For example, a bolt and a nut can be suitably used as the fastening member 161.

The truck hand lifter 1 of the present embodiment described above is configured to be able to lift the front side of a pallet by using the principle of leverage, with the pair of casters 16 as the fulcrum, the gripping portion 12 where the loading and unloading worker applies a downward force as the force point, and the pair of tip claws 15 as the point of application. In the truck hand lifter 1, when the distance from the fulcrum to the force point is L1 and the distance from the fulcrum to the force point is L2, L1:L2 can be, for example, about 1:4 to 1:6. The overall length of the truck hand lifter 1 can be, for example, about 1500 mm, but is not limited to this.

The truck hand lifter of this embodiment has the above-mentioned configuration. Therefore, with the truck hand lifter of this embodiment, after all the pallets stacked in a row on one open side panel are unloaded by a forklift, the pallets stacked on the opposite closed side panel (hereinafter sometimes referred to as the back pallet) can be moved on the loading platform as follows.

That is, a loading worker under the loading platform places the truck hand lifter of this embodiment on the loading platform without climbing onto it. Next, the pair of forks of the truck hand lifter is inserted into one of the multiple insertion openings of the pallet at the back side to be unloaded, into which the forks of the forklift are inserted. Next, in the internal space communicating with the insertion opening of the pallet, a pair of tip claws provided at each tip of the pair of forks are hooked onto a part of the pallet (see FIG. 10). Next, the front side of the pallet is lifted up by the principle of leverage, with the pair of casters as the fulcrum, the gripping part to which the loading worker applies a force pushing down from above as the force point, and the pair of tip claws as the point of action. Next, while the front side of the pallet is still lifted up, the gripping part is pulled straight forward, and the pallet is pulled out (pulled out) to the edge of the loading platform on the forklift operation side.

At this time, if it is difficult to move the pallet straight to the front due to contact and interference between the loads on the adjacent pallets, the pair of tip claws are hooked onto a part of the pallet to lift the front side of the pallet, and then the gripping part is moved left or right to move the tips of the pair of forks slightly to the right or left, and the pallet is moved slightly diagonally to the straight drag direction until the loads on the adjacent pallets no longer come into contact with each other. At this time, in the truck hand lifter of this embodiment, a pair of forks are inserted into one of the pallet insertion holes, so that when the front side of the pallet is lifted by the principle of leverage, the pallet is lifted in a state where it is moderately tilted to the left and right, and the lower edge of the pallet on the back side is also lifted moderately from the loading platform (see FIG. 11). Therefore, compared to lifting the pallet so that the front side of the pallet is horizontal, the contact area between the lower edge of the pallet on the back side and the loading platform is reduced, and the pallet can be moved diagonally to the straight drag direction with little force. Then, just like above, while still lifting the front side of the pallet, pull the gripping part straight towards you and pull the pallet out to the edge of the loading platform on the forklift operation side.

After the pallet is pulled out to the edge of the loading platform on the forklift side, it can be easily lowered by the forklift, as it is within reach of the forks of the forklift.

When the pallet is configured so that one of a pair of fork parts is inserted into one of the two front insertion openings into which the forks of a forklift are inserted, and the other of the pair of fork parts is inserted into the other insertion opening to lift the front side of the pallet, in other words, when the front side of the pallet is lifted while the block part of the pallet between the two insertion openings is sandwiched between the pair of fork parts, the pallet is lifted so that the front side of the pallet is horizontal, making it difficult to drag the pallet diagonally forward.

In addition, with this configuration, the size of the other end of the rod-shaped part (the side opposite the gripping part) must be large. This makes it difficult to load the truck hand lifter into the relatively small spaces and gaps in the bed of a truck carrying multiple pallets carrying cargo.

In contrast, the truck hand lifter of this embodiment is configured to insert a pair of fork parts into one insertion opening, making it possible to reduce the size of the part forward of the rod-shaped part. This makes it easier to load the truck hand lifter of this embodiment into the relatively small spaces and gaps in the bed of a truck carrying multiple pallets loaded with cargo, and also has the advantage of making the front part of the rod-shaped part easier to handle.

In this embodiment, the truck hand lifter has been described using the example of unloading a pallet from one side panel of a wing-type truck, but the truck hand lifter of this embodiment can also be used in wing-type trucks and van-type trucks to pull a pallet located at the back (front of the bed) from the rear side of the bed to the rear of the bed.

The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the configurations shown in the above-described embodiment can be combined in any manner.

Reference Signs List 1 Truck hand lifter 11 Rod-shaped portion 12 Grip portion 13 Fork attachment portion 14 Fork portion 140 Reinforcement portion 15 Tip claw portion 16 Caster 16a Caster wheel 16b Caster fork 160 Caster attachment portion 161 Fastening member

Claims (11)

A truck hand lifter used by a loading worker under a truck bed to move a pallet loaded on the bed,
A rod-shaped portion;
A gripping portion connected to one end of the rod-shaped portion and adapted to be gripped by the cargo handling worker;
a fork attachment portion connected to the other end of the rod-shaped portion;
a pair of fork portions extending from the fork attachment portion so as to form an obtuse angle with the rod-shaped portion, the pair of fork portions being inserted into any one of a plurality of insertion openings in the pallet into which forks of a forklift are inserted;
A pair of tip claws are provided at the respective tips of the pair of fork parts and are adapted to hook onto a part of the pallet in an internal space communicating with the insertion port of the pallet;
At least a pair of caster attachment parts connected to the other end of the rod-shaped part, or a pair of casters attached to the fork attachment part;
having
Hand lifter for trucks. The pair of caster attachment parts are constituted by a pair of caster angle members each having an L-shaped cross section,
One of the mountain side surfaces of each of the caster angle members is connected to the rod-shaped portion,
Each of the casters is attached to the other crest side of each of the caster angle members.
2. A hand lifter for a truck according to claim 1. The pair of fork portions are each made of a square tube member for a fork,
The pair of tip claws are provided to close the tip openings of the respective fork square tube members.
3. A hand lifter for a truck according to claim 1 or 2. The casters are detachably attached to the caster attachment parts.
3. A hand lifter for a truck according to claim 1 or 2. The caster has a caster fork supporting a caster wheel fastened to the caster angle member by a fastening member.
3. The hand lifter for a truck according to claim 2. a reinforcing portion disposed between the pair of fork portions and connected to the pair of fork portions;
3. A hand lifter for a truck according to claim 1 or 2. The reinforcing portion is further connected to the fork mounting portion.
7. A hand lifter for a truck according to claim 6. The caster mounting portion is disposed below the fork mounting portion.
3. A hand lifter for a truck according to claim 1 or 2. The gripping portion is connected to the circumferential surface of the rod-shaped portion.
3. A hand lifter for a truck according to claim 1 or 2. The rod-shaped portion is made of a rod-shaped rectangular tube member,
The gripping portion is connected to an upper surface of the circumferential surface of the rod-shaped portion square tube member.
3. A hand lifter for a truck according to claim 1 or 2. The fork attachment portion is composed of a fork attachment angle member having an L-shaped cross section,
The base end of each of the fork portions is connected to one of the crest sides of the fork mounting angle member.
3. A hand lifter for a truck according to claim 1 or 2.

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