JP4452142B2 - Lorry loading platform - Google Patents

Description

The present invention relates to an improvement of a loading platform mounted on a chassis of a lorry, and particularly relates to a countermeasure for handling an opening / closing gate of both an upper opening type and a lower opening type.

Patent Document 1 discloses a dumping operation that combines a discharging operation of tilting the loading platform downward toward the rear of the vehicle body to discharge (dump) earth and sand and a conveying operation of loading and transporting construction machinery or agricultural machinery on the loading platform. A car is disclosed. In this dump truck, the tailgate of the loading platform rotates upward from the lower hinge with the lower hinge as a fulcrum when loading and unloading construction machinery, agricultural machinery, etc., while the upper hinge is used as a fulcrum when dumping soil and sand. It pivots upward from below and opens downward.
Utility Model Registration No. 2556543 (2nd page, FIG. 1)

  By the way, the opening / closing gate of the loading platform in this kind of lorry is automatically opened downward when the lock device is released at the time of dumping. On the other hand, when the open / close gate is opened upward, an operator supports the open / close gate by hand and slowly rotates it downward. Even when closing the open / close gate, the operator supports the open / close gate by hand and slowly rotates it upward. In general, the opening and closing operation of these open / close gates and the closing operation after the opening are performed by one person.

  In particular, since the open / close gate is very heavy, the operator pays considerable attention when opening and closing the open / close gate thereafter. However, if the operator's hand slips or the hand is released halfway without being able to withstand the weight, the open / close gate opens rapidly, which is extremely dangerous. If the gate is made of a light metal such as an aluminum alloy, it cannot withstand the weight of construction machinery, agricultural machinery, and the like that are loaded and unloaded.

  The present invention has been made in view of the above points, and an object of the present invention is to safely and easily perform the opening and closing operation of the opening and closing gate and the closing operation after the opening by one person.

  In order to achieve the above object, the present invention is characterized in that the opening / closing gate is opened upward and closed after the opening is opened.

Specifically, the present invention is composed of a throughout the outer periphery of the floor plate and the floor plate erected the vertical plate, while opening the upper pivots from above the lower portion hinged to pivot downwardly, upper hinge An open / close gate that pivots upward from below with the fulcrum as a fulcrum is formed of a part of the vertical plate, and the following solution has been taken for the cargo bed mounted on the chassis of a truck.

That is, the invention according to claim 1 is configured such that the opening / closing gate is assisted by an opening / closing gate assist device for an upward opening operation and a closing operation after the upper opening, and the opening / closing gate assist device has a proximal end. A telescopic rod pivotally supported by a first pivot on the back side of the floor and urged so as to always extend by a biasing means, and a third pivot pivotally supported by the second pivot on the floor back side and at the distal end of the telescopic rod It is pivotally supported by and is separated from the above open / close gate, and is pushed by the telescopic rod and pivoted upward about the second pivot axis, and supports the open / close gate lower end when the open / close gate is opened. An opening / closing assisting member that assists the closing operation of the open / close gate by pushing the lower end of the open / close gate during the closing operation after the open / close gate is opened is provided .

  According to the first aspect of the invention, the opening / closing gate assist device assists the opening / closing operation of the opening / closing gate and the closing operation after the opening / closing operation. When the upper gate is opened and then closed, it can be easily supported by one operator, and the upper and lower gates can be opened and closed after the upper gate is opened safely and easily.

Also, closing the auxiliary member so pivotally supported on the telescopic rod end with the floor back is made to separation opening and closing the gate, can be performed under opening operation of the opening and closing gate during the dump without any trouble.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  4 and 5 show a dump truck 1 as a freight car, 3 is a cab, 5 is a chassis behind the cab 3, and a loading platform 7 is mounted on the chassis 5. FIG.

  The loading platform 7 includes a rectangular floor plate 9, and a front plate 11 is erected at the front end of the vehicle body of the floor plate 9, and a pair of side gates 13 are erected at both ends in the vehicle width direction. Further, a tail gate 15 as an open / close gate is erected at the rear end of the vehicle body of the floor plate 9 so that it can be switched to an upper opening or a lower opening. The front plate 11, the side gate 13 and the tail gate 15 are used to It constitutes a vertical plate standing up all over. This dump truck 1 is a type that combines the discharging work of tilting the loading platform 7 forward and downward to discharge the earth and sand (dumping) and the carrying work of loading and transporting construction machinery and agricultural machinery. FIG. 4 shows a state in which the loading platform 7 is slid rearward by the operation of a slide tilting device (not shown), and the tail panel 17 at the rear end of the loading platform 7 is grounded in a posture inclined forward and downward toward the rear of the vehicle. The tailgate 15 is in an open state, and an excavator 19 as a construction machine is loaded on the loading platform 7. FIG. 5 shows a state in which the tailgate 15 is opened downward by tilting the loading platform 7 forward and downward toward the rear of the vehicle body by an extension operation of a hoist cylinder (not shown).

  As shown in FIG. 3, the tailgate 15 pivots upward from below with two upper hinges 21 provided at both ends in the vehicle width direction and opens downward, while being provided near both ends in the vehicle width direction. The two lower hinges 23 are pivoted from the upper side to the lower side with the fulcrum as a fulcrum so as to open upward. Each of the lower hinges 23 includes two first hinge brackets 25 fixed to the lower end of the tailgate 15 and two second hinge brackets 27 fixed to the tail panel 17 at the rear end of the loading platform 7. The hinge pins 29 are inserted into the pin holes 25a and 27a (see FIG. 5) formed in the hinge brackets 25 and 27, respectively. The hinge pin 29 is attached to the tail panel 17 with a chain 31 so that the hinge pin 29 is prevented from falling off the hinge brackets 25 and 27 by changing the direction of the hooking piece 29a at the tip by 90 °.

  On the other hand, each upper hinge 21 is fixed to both ends of the upper edge of the tailgate 15 in the vehicle width direction, and includes a first hinge constituent member 35 having a hinge pin 33 projecting outward in the vehicle width direction, and each side gate 13. A second hinge-constituting member 37 fixed to the rear end of the vehicle body at the edge and having a substantially U-shaped engaging groove (not shown) at which the hinge pin 33 is detachably engaged; A substantially U-shaped engagement groove (not shown) is provided at the upper end of the hinge component member 37 so as to be pivotable in the vertical direction and sandwiches the hinge pin 33 with the engagement groove of the second hinge component member 37. And an operation handle 39 that holds the pinched state of the hinge pin 33 by rotating downward and releases the pinched state of the hinge pin 33 by rotating upward.

  Further, the tail gate 15 is configured to automatically open downward by rotating from the lower side to the upper side with the upper hinge 21 as a fulcrum when the locking device 41 is released at the time of dumping for discharging earth and sand. The locking device 41 includes a locking pin 45 that is bridged by two brackets 43 and fixed to the lower end of the tailgate 15, and a hook 47 that is provided on the tail panel 17. One is arranged inward in the vehicle width direction.

  As a feature of the present invention, an opening / closing gate assist device 49 is installed on the back side of the floor plate 9 at both ends in the vehicle width direction at the rear end of the loading platform 7, as shown in detail in FIGS. 49 is configured to assist the opening operation of the tailgate 15 and the closing operation after the opening.

  Specifically, the opening / closing gate assist device 49 includes an extendable rod 51 that extends rearward of the vehicle body. The telescopic rod 51 includes a proximal end side rod 53 having a circular insertion hole 53 a and a distal end side rod 55, and the distal end side rod 55 is movably inserted into the insertion hole 53 a of the proximal end side rod 53. The cylindrical member 57 and a plate-like member 59 screwed and connected to the cylindrical member 57 and having a distal end curved in a substantially U shape. The base end of the base end side rod 53 is pivotally supported by the first pivot 65 on the back side of the floor plate 9 via the frame member 61 and the bracket 63. Further, spring seats 67 are provided at the base end of the base end side rod 53 and the middle of the front end side rod 55 (near the front end of the columnar member 57), and the telescopic rod 51 between the spring seats 67 is provided. The coil spring 69 as an urging means is externally fitted, and the front end side rod 55 is always rearward of the vehicle body so that the plate member 59 protrudes from the slit hole 17a of the tail panel 17 by the spring force of the coil spring 69. (See the solid line in FIG. 1). That is, the distal end side rod 55 advances from the insertion hole 53a of the proximal end side rod 53 by the spring force of the coil spring 69, and the telescopic rod 51 extends as a whole.

On the back side of the floor plate 9 at both ends in the vehicle width direction at the rear end of the loading platform 7, one side of the lower end of the opening / closing auxiliary member 71 having a substantially U-shaped cross section is pivotally supported by the second pivot 75 via the bracket 73 outside the tail panel 17. ing. The other end of the opening / closing auxiliary member 71 is pivotally supported by a third pivot 77 at the tip of the plate-like member 59 of the telescopic rod 51. That is, the opening / closing auxiliary member 71 is separated from the tailgate 15. As a result, the opening / closing auxiliary member 71 is pushed by the telescopic rod 51 and is urged to rotate upward about the second pivot shaft 75, and the entire body extends rearward from the slit hole 17 a of the tail panel 17 when the telescopic rod 51 is extended. While projecting (see the solid line in FIG. 1), the telescopic rod 51 is reversed downward around the second pivot 75 so that substantially half is hidden from the slit hole 17a behind the tail panel 17 (FIG. 1). (See the two-dot chain line). On the other hand, at the both ends in the vehicle width direction at the lower end of the tailgate 15, a contact plate 79 with which the opening / closing auxiliary member 71 abuts is projected. The opening / closing auxiliary member 71 assists the upward opening operation of the tailgate 15 by supporting the contact plate 79 at the lower end of the tailgate 15 during the upward opening operation of the tailgate 15, as shown by a one-dot chain line in FIG. As indicated by a two-dot chain line in FIG. 1, the closing operation of the tailgate 15 is assisted by pushing the contact plate 79 at the lower end of the tailgate 15 during the closing operation after the tailgate 15 is opened upward.

  When the tailgate 15 configured in this manner is opened upward for loading and unloading construction machinery, agricultural machinery, and the like, the first handle member 35 is rotated by rotating the operation handle 39 of the upper hinge 21 upward. It is only necessary to release the pinching state of the hinge pin 33 and rotate the tailgate 15 upward by rotating it downward from above with the lower hinge 23 as a fulcrum. At this time, the upward opening operation of the tailgate 15 is assisted by the opening / closing gate assist device 49. That is, the load of the tailgate 15 is applied to the opening / closing auxiliary member 71, and the opening / closing auxiliary member 71 rotates from the upper side to the lower side with the second pivot 75 as a fulcrum to be in the inverted posture. Retracts against the spring force of the coil spring 69 and the telescopic rod 51 contracts. The tail gate 15 is supported by the opening / closing auxiliary member 71 by the reaction force generated at this time, and the upward opening operation of the tail gate 15 is assisted by the opening / closing gate assist device 49. Thus, since the tailgate 15 is supported by the opening / closing auxiliary member 71, the opening / closing force by human power is reduced by that amount, and when the tailgate 15 is opened upward, it can be easily supported by one operator. Thus, the upper opening operation of the tailgate 15 can be performed safely and easily.

  On the other hand, when the tailgate 15 is closed after loading and unloading of construction machinery, agricultural machinery, etc., the closing operation after the tailgate 15 is opened is assisted by the opening / closing gate assist device 49. In other words, when the tailgate 15 is lifted upward, the distal end side rod 55 of the telescopic rod 51 that has been pushed by the tailgate 15 and is in a contracted state is pushed forward by the spring force of the coil spring 69, thereby moving the tailgate. Since the gate 15 is pushed by the opening / closing auxiliary member 71 and lifted upward, the opening / closing force by human power is reduced by that amount, and when the tailgate 15 is closed after being opened upward, it can be easily supported by one operator. Thus, the closing operation after the tail gate 15 is opened can be performed safely and easily. After closing the tailgate 15, the operation handle 39 of the upper hinge 21 may be rotated downward to hold the hinge pin 33 of the first hinge component 35.

Also, closing the auxiliary member 71 since it is pivotally supported by separation and tailgate 15 in a plate member 59 the tip of the floor plate 9 back and stretching rod 51, without hindrance under opening operation of the tailgate 15 at the time of the dump Can be done .

In this embodiment, the tail gate 15 is exemplified as the open / close gate, but it can also be applied to the side gate.

The present invention is useful as an open / close gate that opens and closes a loading platform mounted on a chassis of a truck.

It is a side view of an opening / closing gate assist device. It is the figure which looked at the opening / closing gate assist apparatus installation location of a tailgate from the vehicle body rear. It is the figure which looked at the whole tailgate from the vehicle body back. It is a perspective view of the dump truck in a state where the rear end of the loading platform is grounded and the tailgate is opened upward. It is a perspective view of a dump truck with a tailgate opened downward during dumping.

1 Dump truck (lorry)
5 chassis 7 loading platform 9 floor board 11 front board (vertical board)
13 Side gate (vertical board)
15 Tailgate (open / close gate, vertical plate)
23 Lower hinge 49 Opening / closing gate assist device 51 Telescopic rod 65 First pivot 69 Coil spring (biasing means)
71 Auxiliary Open / Close Member 75 Second Axis 77 Third Axis

Claims (1)

It consists of a throughout the outer periphery of the floor plate and the floor plate erected the vertical plate, while opening the upper pivots from above the lower portion hinged to pivot downward, pivoting from below an upper hinge pivot upwardly The opening and closing gate that opens downward is composed of a part of the vertical plate, and is a loading platform mounted on the chassis of a truck.
The open / close gate is configured so that the open / close gate assist device assists the opening operation and the closing operation after the opening ,
The open / close gate assist device includes a telescopic rod whose base end is pivotally supported by the first pivot on the back side of the floor surface and is always extended by the biasing means;
It is pivotally supported by the second pivot on the back side of the floor plate and pivotally supported by the third pivot at the distal end of the telescopic rod, and is separated from the open / close gate, and is pushed upward by the telescopic rod to move around the second pivot The upper and lower gates are supported by supporting the lower end of the open / close gate when the open / close gate is opened upward, while the open / close gate is pushed down and closed when the open / close gate is opened. An opening / closing assisting member for assisting a closing operation is provided .

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