JPH074131U - Lift-up side plate opening / closing mechanism for truck carrier body - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a mechanism for opening and closing a flip-up side plate of a truck carrier body, which can easily mechanize a human-operated flip-up side plate using an auxiliary spring, and a side plate at an open end. To obtain a mechanism that can also stabilize the retention of [Structure] In a flip-up side plate opening / closing mechanism for a truck carrier body, which is provided with an auxiliary spring 5 for urging the side plate 1 of the carrier body in a repelling direction, a motor 6 with a reducer is attached to a frame 2.
Is fixed with its output shaft 7 in the axial direction, and the output shaft 7 and the flip-up side plate 1 are connected via a crank arm 8 and a connecting rod 9 connected to the crank arm 8. At the open end, the crank arm 8 and the connecting rod 9 linearly extend to support the flip-up side plate 1 at the top dead center position of the crank arm 8.
A stopper 11 is provided to prevent the crank arm 8 or the connecting rod 9 from swinging at a position immediately after the crank arm 8 exceeds the upper fulcrum.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a mechanism for opening and closing a flip-up side plate of a truck carrier body.

[0002]

[Prior art]

 Most of the flip-up side plates of a truck carrier body are opened and closed by using an electric motor or a hydraulic cylinder as a drive source, but a simple and inexpensive structure that is manually opened and closed is also in practical use. For those that can be opened and closed by human power, an auxiliary spring that biases the side plate in the direction of flipping up is provided so that the splashing operation can be performed with a light force by balancing with the weight of the side plate.

[0003]

[Problems to be solved by the device]

 Since this auxiliary spring is installed so as to bias the side plate in the flip-up direction, it is greatly deformed when the side plate is closed (compression spring is in a compressed state, tension spring is in an extended state). The side panels are almost closed except when loading and unloading luggage. Therefore, the auxiliary spring is placed in a long state in a state of being largely deformed, and permanent strain occurs (falls), so that the biasing force tends to be weakened. Therefore, the manual opening / closing type that uses an auxiliary spring had a problem that a force was required to lift up the side plate while using it for a while. This problem has become more frequent in women's body opening and closing operations due to the recent lack of manual labor, which has become a problem that cannot be left unattended, and it is difficult to mechanize the opening and closing of the side plate, which is difficult to open manually. The desire has arisen.

Further, the human-operated open / close type has a drawback that the open side plate is easily liable to be blown by wind or the like in order to reduce the force required for opening / closing the side plate. That is, at the flip-up end, the side plate is kept pressed against the stopper that defines the opening limit by the urging force of the auxiliary spring, but if this pressing force is increased, a strong force is required when the side plate is closed. In addition, since it is dangerous that the side plate suddenly flips up when opening the side plate, it is not possible to increase the biasing force of the auxiliary spring so much, and the holding force of the side plate at the open end also becomes small. When the auxiliary spring is weakened, the holding force becomes even smaller and the open side plate is easily agitated by the wind.

This invention was made in order to meet the demand for easy mechanization of a manually openable flip-up side plate, which makes it difficult to manually open and close the side plate due to weakening of the biasing force of the auxiliary spring. Therefore, it is an object to obtain a mechanism that has a simple structure and can be easily attached to an existing luggage carrier body, and that can also stabilize the holding of the side plate at the open end.

[0006]

[Means for Solving the Problems]

 The flip-up side plate opening / closing mechanism of a truck carrier body according to the present invention is a flip-up side plate opening / closing mechanism of a truck carrier body provided with an auxiliary spring 5 for urging the side plate 1 of the truck body in a flip-up direction. A reduction gear motor 6 is fixed with its output shaft 7 oriented in the axle direction, and the output shaft 7 and the flip-up side plate 1 are connected via a crank arm 8 and a connecting rod 9 connected thereto. The crank arm 8 and the connecting rod 9 extend linearly at the open end of the flip-up side plate 1, and support the flip-up side plate 1 at the top dead center position of the crank arm 8. is there. It is possible to provide a stopper 11 for preventing the crank arm 8 or the connecting rod 9 from swinging at a position immediately after the crank arm 8 crosses the upper fulcrum.

[0007]

[Action]

 In this type of opening / closing mechanism, if the structure is such that the rotation center of the crank arm 8 is directly fixed to the output shaft 7 of the motor 6 with a speed reducer and the crank arm 8 is rotated, a large output torque that opposes the weight of the side plate 1 is generated. However, the side plate opening / closing mechanism of the present invention is based on the premise that the auxiliary spring 5 for balancing the weight of the side plate 1 is provided, and is therefore conventionally used. It does not require a large operating force like a mechanical opening / closing mechanism. Therefore, it is possible to open and close the side plate 1 by rotating the crank arm 8 with the output shaft 7 of the motor 6 having a reduction gear having a relatively small output torque as a direct crank shaft.

On the other hand, if the side plate 1 is held in the open state with this small operation force, the side plate holding force at the open end remains weak, so that the crank arm 8 and the connecting rod 9 are linear at the open end of the side plate. It is designed to be elongated. In the state where the crank arm 8 and the connecting rod 9 are linearly extended, the external force that tries to stir the opened side plate 1 is received by the axial force of the connecting rod 9 and the crank arm 8. No moment in the bending direction acts on the arm 8, so that the side plate 1 is stably held at its open end.

Further, if the motor with reducer 6, the crank arm 8 and the connecting rod 9 are mounted on the truck with the loading platform body which has the existing human-operated opening / closing side plate, the mechanical opening / closing device of the present invention can be realized. It is possible to easily mechanize the human-operated loading and unloading platform body, which has become difficult to open and close due to the spring force, and the motor 6 with reduction gear is fixed to the cabback frame 2 of the truck. Can be done easily.

[0010]

【Example】

 FIG. 1 shows an embodiment of this invention. The side plate 1 of the luggage carrier body is rotatably and pivotally mounted by a fulcrum shaft 3 mounted on a gate-shaped luggage carrier frame 2 provided in front of and behind the luggage carrier at a position near the center of the vehicle body. A compression spring 5 is provided between the front and rear cargo frame 2 and the frame 4 of the side plate 1, and the urging force of the compression spring 5 acts in a direction to repel the side plate 1 around the fulcrum shaft 3. The reduction gear motor 6 is mounted on the upper part of the front carrier frame, and its output shaft 7 penetrates the carrier frame 2 and extends inward, and the base end of the crank arm 8 is fixed to the inner end thereof. ing. The tip of the crank arm 8 and the frame 4 of the side plate are pivotally connected by a connecting rod 9.

On the turning locus of the crank arm 8, the crank arm 8 and the connecting rod 9 extend in a straight line and then swing slightly toward the center of the vehicle body. It is fixedly attached to the frame 2. The length of the crank arm 8 and the length of the connecting rod 9 are set so that the side plate 1 becomes an open end when they extend in a straight line.

In the above configuration, when the output shaft 7 of the reduction gear motor 6 is rotated to the right in FIG. 2, the crank arm 8 is rotated to the right and rotated to the top dead center direction. By this, the connecting rod 9 is pushed up and the side plate 1 is opened. At this time, the compression spring 5 gives the side plate 1 a clockwise moment around the fulcrum shaft 3, and the weight of the side plate 1 is taken by the compression spring 5 and the torque of the output shaft 7 of the reduction gear motor. Move the side plate 1 to the open end. At this open end, the crank arm 8 and the connecting rod 9 extend in a substantially straight line, and at the position where the crank arm 8 contacts the stopper 11, the motor 6 with a reducer stops and holds the side plate 1 in an open state. .

When an external force is applied to the side plate 1 held in the open state by wind or the like, the side plate 1 tries to swing in the opening or closing direction, but the side plate at the open end does not swing. The applied external force is resisted by the axial compression and tensile force of the linearly extending crank arm 8 and the connecting rod 9, and the output shaft 7 of the motor 6 with reduction gear, the fulcrum shaft 3 of the side plate, and the tip of the connecting rod. Since the fulcrum 12 and each of the vertices occupy the respective vertex positions of the triangle, the fulcrum 12 at the tip of the connecting rod is held in a fixed position, so that the side plate 1 at the open end is stably supported.

When the output shaft 7 of the motor 6 with a reducer is rotated to the left in FIG. 2, the crank arm 8 swings downward, pulling down the side plate 1 via the connecting rod 9, 1 is closed. At this time, the force applied to the speed reducer motor 6 is the force obtained by subtracting the own weight of the side plate 1 from the urging force of the spring 5, and the side plate 1 is closed with a small output torque as in the case of opening the side plate 1. be able to.

[0015]

[Effect of device]

 According to the present invention described above, there is an effect that it is possible to easily and inexpensively remodel a cargo bed body of a manual open / close type truck whose opening / closing operation is heavy due to fatigue of an auxiliary spring into a mechanical open / close type.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a schematic front view showing the operation of the link of the embodiment.

[Explanation of symbols]

 1 Side Plate 2 Bed Frame 5 Compression Spring 6 Motor with Reducer 7 Output Shaft 8 Crank Arm 9 Connecting Rod 11 Stopper

Claims (2)

[Scope of utility model registration request] 1. In a flip-up side plate opening / closing mechanism for a truck carrier body, which is provided with an auxiliary spring (5) for urging the side plate (1) of the carrier body in a repelling direction, a motor with a speed reducer () is attached to a frame (2). 6) is fixed with its output shaft (7) in the axial direction, and the output shaft (7) and the flip-up side plate (1) are connected to the crank arm (8) and the connecting rod (9) connected to the crank arm (8). The crank arm (8) and the connecting rod (9) extend linearly at the open end of the flip-up side plate (1),
(8) A flip-up side plate opening / closing mechanism for a truck carrier body, which supports the flip-up side plate (1) at the top dead center position. 2. A stopper (11) for preventing the crank arm (8) or the connecting rod (9) from swinging at a position immediately after the crank arm (8) crosses an upper fulcrum. The flip-up side plate opening / closing mechanism described.