JP4993392B2 - Fork moving device for cargo handling vehicle - Google Patents

Description

  The present invention relates to a fork moving device for a cargo handling vehicle capable of turning a fork.

As shown in FIG. 6, the three-way stacking track 101 is mounted with a shift head 109 that moves along a shift rail 107 on an elevating carriage 105 that is supported by a mast 103 so as to be movable up and down. Two forks 113 are joined to a shaft 111 via finger bars 115.

As shown in FIG. 7A, considering the width (W) of the load 117 that can be handled by the three-way stacking truck 101, as shown in FIG. A dimension S from the lifting carriage 105 to the turning shaft 111 is set so that 117 does not contact the shift rail 107. As the dimension S is longer, the three-way stacking truck 101 can handle a wider load. Table 1 shows three-way stacking trucks each having a dimension S set as described above with respect to the widths of the four types of packages (L × W) and the weight of the packages. It shows the height at which the load can be lifted.

  However, since the position of the load 117 supported by the fork 113 is in front of the vehicle body 119 with respect to the mast 103 shown in FIG. 6, the weight of the load 117 acts as a moment on the mast 103. Becomes unstable. Further, the load 117 is supported by the fork 113 directed to the front of the vehicle body 119 as shown in FIG. 7A, rather than the load 117 supported by the fork 113 rotated 90 ° as shown in FIG. 7B. As a result, the load 117 is positioned in front of the vehicle body 119, and the moment increases.

  It is assumed that the width of the load 117 is 1300 mm and its weight exceeds 780 kg. From the viewpoint of the physical strength of the three-way stacking truck 101, even if the load 117 is lifted to a lifting height of 5500 mm while the fork 113 is turned 90 °, the fork 113 is directed to the front of the vehicle body 119 as it is. Becomes unstable. This tendency becomes more prominent as the dimension S is longer or the lift is higher. For example, if a three-way stacking truck with dimension S set to handle a 1500 mm wide load lifts the load to a lift of 6500 mm, the weight of the load is limited to 600 kg.

  Further, if a counterweight for canceling the moment is provided in the vehicle body 119, the three-way stacking truck 101 can be stabilized to some extent. However, this increases the size of the vehicle body 119, which hinders the traveling of the three-way stacking truck 101 on a premises such as an automatic warehouse.

JP 2005-82287 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fork moving device for a cargo handling vehicle that can stably lift a load regardless of its load form.

In order to achieve the above object, the present invention provides a mast that rises from a vehicle body, an elevating carriage that is supported by the mast to be movable up and down, and is supported by the elevating carriage so as to be movable in the vehicle width direction and extends forward of the vehicle body. A fork moving device for a cargo handling vehicle, comprising: a shift head; a turning shaft supported by the shift head; and a fork extending in a horizontal direction from the shift head , wherein the fork is turned in the horizontal direction about the turning shaft. a is, in a posture extending both ends in the horizontal direction perpendicular to the fork, and a rack which is fixed through the finger bar to the fork, the slide rail fixed to the finger bar, the fixed slider to said pivot axis a guide means which has movably engaged in the horizontal direction, before being secured to the shift head so that the center coincides with the pivot axis And a pinion engaged with the rack, when the rack meshes with the pinion at a position bisecting between its ends, the fork orientation in front of the vehicle body, the process of turning of the fork in accordance with the rotation of said pivot axis Thus, the fork moves together with the finger bar from the lifting carriage to the front of the vehicle body with respect to the pivot shaft by the amount that the position of the pinion meshing with the rack moves toward one end of both ends of the rack . and said that you move in the direction away.

According to a fork moving device handling vehicle according to the present invention, in the course of a fork that is toward the front of the vehicle body is pivot to face the vehicle width direction is rotated by Rukoto move fork forward of the vehicle body, Since the distance between the fork facing the vehicle width direction and the lifting carriage is widened, the fork moving device is supported by the fork facing the vehicle width direction without unnecessarily increasing the dimension from the lifting carriage to the turning shaft. A desired distance can be ensured between the load and the shift rack.

  Moreover, according to the fork moving device for a cargo handling vehicle according to the present invention, the moment acting on the mast can be suppressed while the load is supported by the fork directed forward of the vehicle body. For this reason, the said fork moving apparatus can eliminate that the weight of the load which can be supported with a fork, or its lifting height is restricted by the load form of the load. In addition, the fork moving device can achieve the effects described here without increasing the size of the vehicle body.

Sectional drawing which shows the principal part of the fork moving apparatus of the cargo handling vehicle which concerns on embodiment of this invention. AA sectional view taken on the line AA of FIG. Sectional drawing which shows the operation | movement process of the principal part of the fork moving apparatus of the cargo handling vehicle which concerns on embodiment of this invention. Sectional drawing which shows an example of the operation state of the principal part of the fork moving apparatus of the cargo handling vehicle which concerns on embodiment of this invention. Sectional drawing which shows the other example of the operation state of the principal part of the fork moving apparatus of the cargo handling vehicle which concerns on embodiment of this invention. The perspective view of a cargo handling vehicle. (A) is a top view which shows the conventional usage example of a cargo handling vehicle, (b) is a top view which shows the other usage example.

  An embodiment of a fork moving device for a cargo handling vehicle according to the present invention will be described. The same designations will continue to be used for elements already described in the prior art, regardless of whether they are shown.

  As shown in FIGS. 1 and 2, the cargo handling vehicle 1 includes a lift carriage 3, a shift head 5, a fork 7 that extends horizontally from the shift head 5, and a turn that serves as a fulcrum for the fork 7 to turn horizontally. It is a three-way stacking truck comprising a shaft 9. The fork moving device 11 applied to the cargo handling vehicle 1 includes two racks 15 fixed to the fork 7 via finger bars 13 in a posture in which both ends 43 and 45 extend in a horizontal direction orthogonal to the fork 7, and the fork 7 is provided with two guide means 17 for joining the swivel shaft 9 so as to be movable in a horizontal direction (direction along the rack 15) orthogonal to the two, and two pinions 19 respectively engaged with the two racks 15.

  The lifting carriage 3 has a roller 21 that engages with the mast and is a frame that can be lifted and lowered along the mast. The raising / lowering of the raising / lowering carriage 3 is implement | achieved by operating a mast cylinder based on the hydraulic pressure which the hydraulic pump which does not appear in a figure generate | occur | produces. Further, the lifting carriage 3 fixes two shift rails 27 made of steel and supports the rack 23 extending in the vehicle width direction of the vehicle body of the cargo handling vehicle 1 by the shift rail 27.

  The shift head 5 is provided with a roller 29 that engages with a shift rail 27 in a housing 25 that extends from the lifting carriage 3 to the front of the vehicle body of the cargo handling vehicle 1. The casing 25 receives the pivot shaft 9 and the rotary shaft 10 in an upright posture, and fixes the hydraulic motors 31 and 33 and the pinion 19. A pinion 24 that meshes with the rack 23 is fixed to the rotary shaft 10. When the hydraulic motor 31 rotates the rotary shaft 10, the shift head 5 can move in the vehicle width direction according to the rack 23.

  The guide means 17 has a slider 37 movably engaged with a slide rail 35 fixed to the finger bar 13. The slider 37 is fixed to the turning shaft 9 via a support plate 39, and the guide means 17 receives the load of the load supported by the fork 7. The rotational force of the hydraulic motor 33 is transmitted to the turning shaft 9 via a speed reducer 41 formed of a gear train. The pinion 19 is an arc-shaped sector gear formed of a spur gear, and is positioned on the casing 25 of the shift head 5 so that the center of the pitch circle coincides with the geometric center line of the turning shaft 9.

  As shown in FIG. 2, in a state where the fork 7 is directed to the front of the vehicle body, the position at which the two ends 43 and 45 of the rack 15 are equally divided is coincident with the geometric center of the swivel shaft 9. . When the fork 7 shown in the figure is turned so that the tip thereof faces one side in the vehicle width direction, the cargo handling vehicle 1 rotates the turning shaft 9 clockwise as shown in FIG. In this process, the fork 7 moves together with the finger bar 13 toward the front of the vehicle body as much as the position of the pinion 19 moves relative to the end 43 of the rack 15. Thereby, as shown in FIG. 4, the space | interval of the fork 7 which turned to one side of the vehicle width direction and the raising / lowering carriage 3 shown in FIG. 1 becomes wide. The dimension x indicates the distance that the position where the fork 7 turns 90 ° from the geometric center of the swivel shaft 9 moves to the front of the vehicle body. Yes.

  On the contrary, when the fork 7 shown in FIG. 4 is turned so that the tip thereof faces the front of the vehicle body, the cargo handling vehicle 1 rotates the turning shaft 9 counterclockwise in the drawing. In this process, the fork 7 moves backward with respect to the turning shaft 9 as the position of the pinion 19 relatively moves from one end 43 to the other end 45 of the rack 15. When the fork 7 is turned 90 ° counterclockwise in the drawing, the rack 15 returns to the position shown in FIG.

  Alternatively, when the fork 7 shown in FIG. 2 is turned so that the tip thereof faces the other in the vehicle width direction, the cargo handling vehicle 1 rotates the turning shaft 9 counterclockwise in the drawing. In this process, the fork 7 moves to the front of the vehicle body with respect to the turning shaft 9 as the pinion 19 moves relative to the other end 45 of the rack 15. As a result, the distance between the fork 7 facing the other in the vehicle width direction as shown in FIG. 5 and the elevating carriage 3 shown in FIG. 1 is increased.

  As described above, the fork moving device 11 is provided from the lifting carriage 3 in the conventional manner in order to secure a desired distance between the load supported by the fork 7 facing the vehicle width direction and the shift rail 27. There is no need to lengthen the dimension S to the turning shaft 9. Further, since the fork moving device 11 can relatively shorten the above-described dimension S, the moment acting on the mast 103 when the load is supported by the fork 7 directed forward of the vehicle body can be reduced.

  For this reason, it can be solved as shown in Table 2 that the weight of the load 117 that the cargo handling vehicle 1 can support with the fork 7 or the lifting height thereof is limited by the load form of the load. That is, the numerical value with an underline in Table 2 indicates that the fork moving device 11 is set against the weight of the load that the three-way stacking truck shown in Table 1 can lift to the lifting height shown in the table. It shows that the weight of the load that can be lifted by the applied cargo handling vehicle 1 has increased.

Further, the fork moving device 11 has an advantage that it is not necessary to increase the size of the vehicle body of the cargo handling vehicle 1 because it is not necessary to provide a counterweight or the like on the vehicle body of the cargo handling vehicle 1 in order to achieve the effects described above.

It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, the fork moving device 11 does not need to be provided with two racks 15 and two pinions 19 as shown in FIG. 1, and the number of these is not limited .

The present invention is a technique that can be applied to a cargo handling vehicle that transports not only a load placed on a pallet but also any type of load.

  DESCRIPTION OF SYMBOLS 1 ... Cargo handling vehicle, 3,105 ... Elevating carriage, 5,109 ... Shift head, 7,113 ... Fork, 10 ... Rotating shaft, 9, 111 ... Turning axis, 11 ... fork moving device for cargo handling vehicle, 13, 115 ... finger bar, 15, 23 ... rack, 17 ... guide means, 19 ... pinion, 21, 29 ... roller, 25. ..Case, 27 ... Shift rail, 31, 33 ... Hydraulic motor, 35 ... Slide rail, 37 ... Slider, 39 ... Support plate, 41 ... Speed reducer, 43. .. One end, 45 ... the other end, 101 ... three-way stacking truck, 103 ... mast, 117 ... luggage, 119 ... car body.

Claims (1)

A mast that rises from a vehicle body, a lift carriage that is supported by the mast so as to be movable up and down, a shift head that is supported by the lift carriage so as to be movable in the vehicle width direction, and that extends forward of the vehicle body, and is supported by the shift head. A fork moving device for a cargo handling vehicle, wherein the fork moves in a horizontal direction about the turning shaft as a fulcrum .
In a posture extending both ends in the horizontal direction perpendicular to the fork, and a rack which is fixed through the finger bar to the fork,
Guiding means in which a slide rail fixed to the finger bar is engaged with a slider fixed to the pivot shaft so as to be movable in the horizontal direction ;
A pinion fixed to the shift head and meshed with the rack so that the center coincides with the pivot axis;
When the rack meshes with the pinion at a position that bisects both ends, the fork faces the front of the vehicle body,
In the process of turning the fork according to the rotation of the turning shaft, the position of the pinion that meshes with the rack moves toward one end of both ends of the rack, so that the fork together with the finger bar moves to the turning shaft. fork moving device handling vehicle, characterized that you move in a direction away forward of the vehicle body from the lifting carriage against.

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