JPH0636968U - Lifting device for carrier bed - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A carrier bed for supporting a cargo bed mounted on a vehicle body with a bending / extending frame body composed of crosslinks, and lifting and lowering the cargo bed by bending / extending of the bending / expansion frame body. In the elevating device, stability in a posture in which the loading platform is raised is good, and the lifting height of the loading platform is large. [Structure] A bending / stretching frame body for supporting a cargo bed is combined with a link whose upper end is rotatably pivoted to the front part of the lower surface of the pallet and whose lower end is rotatably pivoted to the rear part of the vehicle body in a crossed manner. The upper and lower ends of the guide rail are composed of cross links, the upper end of which is slidably engaged with the rear guide rail and the lower end of which is slidably engaged with the front guide rail. -The link to be engaged with the rail is formed to be shorter than the other link by a predetermined length, and the end of the horizontal guide of both guide rails is provided with the inclined guide paths, so that the bending and stretching frame is The loading platform elevating device is configured so that when it is extended, the loading platform rises horizontally and moves toward the center of the vehicle body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loading platform lifting device for a carrier configured to mount a loading platform on a vehicle body by a bending frame and to elevate the loading platform by extension and contraction of the bending frame.

[0002]

[Prior art]

 This type of loading platform elevating device is constructed such that the bending and stretching frame that supports the loading platform is composed of cross links, and the cross links are flexed and extended by an expansion and contraction actuator such as a hydraulic cylinder to raise and lower the loading platform. In the conventional type, one end of a cross link consisting of links of the same length is pivotally attached to the carrier and the car body, and the other end of the cross link is slidable along a guide rail provided on the carrier and the car body. It is configured to be engaged with each other and to move away from the center of the vehicle body as the loading platform rises (for example, see Japanese Utility Model Laid-Open No. 56-122634).

[0003]

[Problems to be solved by the device]

 In the conventional type, as the load platform rises, it moves away from the center of the vehicle body, so when the vehicle body tilts on a sloping ground, etc., the front-rear balance is greatly disrupted and stability is impaired. However, there was a problem that the lift of the loading platform could not be increased. The present invention has been made in view of such a problem, and an object thereof is to enable the loading platform to be lifted under a stable condition in which the front-rear balance is not largely lost. Moreover, it is intended to provide a carrier platform elevating device which is improved so that the platform height can be increased.

[0004]

[Means for Solving the Problems]

 That is, in the loading platform lifting device for a transport vehicle according to the present invention, the bending and stretching frame body 2 that supports the loading platform 1 is pivotally attached at the upper end to the front portion of the lower surface of the loading platform 1 and at the lower end to the rear portion of the vehicle body 3. The link 4 is pivotally attached to the vehicle, and the upper end is slidably engaged with the guide rail 5 at the rear of the lower surface of the loading platform and the lower end is slidably engaged with the guide rail 6 at the front of the vehicle body. The link 7 is composed of a cross link composed of the combined link 7 and the upper and lower ends of which are slidably engaged with the guide rails 5 and 6 is formed to be shorter than the other link 4 by a predetermined length. At the same time, the ends of the horizontal guideways 5a and 6a of both guide rails 5 and 6 are provided with inclined guideways 5b and 6b, respectively, and when the bending and stretching frame body 2 is extended, the loading platform 1 is in a horizontal position. It is characterized in that it is configured so as to rise and shift toward the center of the vehicle body.

[0005]

[Operation and effect of the device]

 In a transport vehicle in which the device of the present invention is implemented, when the bending and stretching frame 2 is operated in the extension direction, the link 4 having the upper end pivotally supported by the luggage carrier 1 and the lower end pivotally supported by the rear part of the vehicle body is provided at the rear part of the vehicle body. While standing up and turning around the pivot point, the link 7 on the other side moves up and down along the guide rail 5 and the guide rail 6 at the front of the vehicle body to move up and down. 1 is maintained in a horizontal posture and is lifted up. On the other hand, when the end of the link 7 reaches the inclined guideways 5b and 6b of the guide rails 5 and 6, respectively, they are moved along the inclined guideways. Thus, the cargo bed 1 continues to rise while being kept in a horizontal posture, and in such a climbing process, the cargo bed 1 shifts toward the center of the vehicle body as the climbing progresses. Therefore, according to the device of the present invention, it is possible to maintain a stable state in which the front and rear balance is good even when the loading platform is lifted, and it is possible to raise the loading platform higher.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 is a schematic side view of a carrier in which the device of the present invention is implemented, FIG. 2 is a cross-sectional view showing a guide rail portion of a loading platform of the device of the present invention, and FIG. 3 is a vehicle body of the device of the present invention. FIG. 4 is a sectional view showing the guide rail portion of FIG. 4, and FIG. 4 is an explanatory view of the operation of the device of the present invention.

In FIG. 1, the transport vehicle is composed of a vehicle body 3 provided with a pair of left and right crawler traveling parts 8, a loading platform 1 and the like mounted on the vehicle body 3 via a bending / extending frame body 2 so as to be vertically movable. ing. In addition, the crawler traveling unit 8 is a dynamic force transmitted through a traveling mission that is interlockingly connected to an engine (not shown) of a driving unit 9 arranged at the upper rear end of the vehicle body 3. It is designed to be driven, and a walking driving device 10 1 is provided at the rear portion of the vehicle body 3.

The bending and stretching frame body 2 has two links 4 and 7 combined in an X-shape in a side view, and a cross link in which the intersections of the links 4 and 7 are rotatably coupled to a shaft 11 in a lateral direction of the vehicle body 3. The framework is constructed by arranging them in parallel. One of the links 4 constituting the cross link is provided such that the upper end thereof is rotatably pivoted on the lower surface front part of the luggage carrier 1 and the lower end is rotatably pivoted on the rear part of the vehicle body 3. There is.

The other link 7, which constitutes a cross link, is formed to be shorter than the link 4 by a predetermined length, and the upper end thereof is slidable on a guide rail 5 laid on the rear portion of the lower surface of the luggage carrier 1. And a lower end thereof is slidably engaged with a guide rail 6 laid on the front part of the vehicle body 3.

The guide rail 6 laid on the vehicle body 3 is formed by arranging a sloping guide path 6 b at the end of a horizontal guide path 6 a in a row, and the guide rail 5 laid on the cargo bed 1. Has a horizontal guideway 5a terminated with a crocodile inclined guideway 5b. In the guide rail 5 of the loading platform 1, a horizontal guideway 5a is located at the rear of the entire body, and an inclined guideway 5b is continuously provided in front of the horizontal guideway 5a. The positional relationship is reversed, and the vehicle body 3 has the tilt guideway 6b in the guide rail 6 inclined obliquely rearward and upward, and the loading platform 1 has the guideway 5b in the guide rail 5 tilted. Is inclined diagonally forward and downward so that both inclined guideways 6b, 5b are parallel to each other.

It is preferable that the parts forming the inclined guideways 5b and 6b are provided separately from the parts forming the horizontal guideways 5a and 6a, respectively, so that they can be attached and detached as necessary. With such a configuration, if one of the inclined guideways is removed, it becomes a device that can ascend / descend the loading platform 1 and tilt the dump truck.

The cross link having such a configuration is configured to bend and expand in the vertical direction by the hydraulic cylinder that is the expansion / contraction actuator 12, and the expansion / contraction actuator 12 includes the link plates 4 and 7. The cylinder has its end pivotally attached to an operating arm extending from a tubular body fitted to a shaft 11 for rotatably connecting the crossing portion, and the piston has its end attached to the lower end of the link 7. It is rotatably mounted on an actuating arm extending from a tubular body fitted on the horizontal axis connecting the two parts, and is expanded / contracted by a hydraulic device mounted on the driving part 9.

Therefore, in the transport vehicle in which the loading platform 1 is supported by the bending and stretching frame body 2 configured as in the embodiment, the bending and stretching frame body 2 is folded when the telescopic actuator 12 is minimized. 1 and the pallet 4 is kept in the horizontal position at the lowest position as shown by the phantom line in FIG.

When the telescopic actuator 12 is extended from the storage posture as described above, the link 4 whose upper and lower ends are pivotally supported by the luggage carrier 1 and the rear part of the vehicle body is centered on the pivotal fulcrum of the rear part of the vehicle body. The loading platform 1 turns upright while the other link 7 moves up and down along the guide rail 5 of the loading platform 1 and the guide rail 6 on the front of the vehicle body. It is held in a horizontal position and raised.

However, when the end of the other link 7 reaches the end of the horizontal guideways 5a, 6a of the guide rails 5, 6, the loading platform 1 moves upward as shown by the broken line in FIG. As the link 7 moves, and the end of the link 7 moves from the horizontal taxiways 5a and 6a to the inclined taxiways 5b and 6b to continue the transition, the loading platform 1 moves further upward as shown by the solid line in FIG. Ascend and move towards the center of the vehicle.

[Brief description of drawings]

1 is a schematic side view of a carrier in which the device of the present invention is implemented.

FIG. 2 is a cross-sectional view showing a guide rail for the bed of the device of the present invention.

FIG. 3 is a sectional view showing a guide rail for the vehicle body in the device of the present invention.

FIG. 4 is an explanatory view of the operation of the device of the present invention.

[Explanation of symbols]

 1 Luggage 2 Bending / extending frame 3 Body 4 Link 5 Luggage guide rail 5a Horizontal taxiway 5b Slope taxiway 6 Vehicle harrow guide rail 6a Horizontal taxiway 6b Slope taxiway 7 Link

Claims (1)

[Scope of utility model registration request] 1. A bending / stretching frame body (2) for supporting a luggage carrier (1) is rotatably pivoted at an upper end to a front portion of a lower surface of the luggage carrier (1) and at a lower end to a rear portion of a vehicle body (3). And a link (4) pivotally attached to the guide rail (5), and the upper end of which is slidably engaged with the guide rail (5) at the rear portion of the lower surface of the bed and the lower end of the guide rail (6) at the front portion of the vehicle body. ) Is formed by a cross link consisting of a link (7) slidably engaged with the guide rail (5).
Link (7) slidably engaged with (6) to the other link
The guide rails (5) and (6) are formed so as to be shorter than (4) by a predetermined length, and the end portions of the horizontal guideways (5a) and (6a) of the guide rails (5) and (6) are all inclined guideways (5b) and (6b). Bending and stretching frame body
When the extension operation of (2) is performed, the loading platform (1) rises in a horizontal posture and shifts toward the center of the vehicle body.