JPS5984624A - Open/close device for truck load table cover - Google Patents

Abstract

PURPOSE:In a device where L-shaped cover frame bodies are fixed to two rotary shafts to be supported rotatably between supports provided at opposite ends of a load table, to improve the operationability by energizing each cover frame body in the opening direction through a torsion bar. CONSTITUTION:Two rotary shafts 4, 4' are arranged in parallel with interval between C-shaped supports 3, 3' secured at the opposite ends of load table 2 of truck 1 while suspended rotatably in upper center of supports 3, 3' through bearings 5, 5'. Then L-shaped cover frame members 6, 6' made of pipe are fixed to each shafts 4, 4' to stretch a cover cloth over said frame bodies 6, 6'. While a plurality of torsion bars 7, 7' for energizing each cover frame body 6, 6' in the opening direction are fixed nearer to the center than each shaft 4, 4'. In other word, one end of torsion bar 7 is secured to a bracket 10 integral with a hollow pipe 8 penetrating through the shaft 4 while the other end is journaled by a bearing provided to the support 3 through a bracket.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hood opening/closing device provided on a truck bed.

The conventional hood opening/closing device of this type is Utility Model Publication No. 54-249.
There are some such as those shown in Publication No. 6, etc.

That is, in the above-mentioned conventional device, a beam is constructed between the upper ends of the pillars fixed to the front and rear of the loading platform, and a pair of abbreviated canopy frames covering each side of the loading platform are installed on both sides of the beam. is rotatably supported, and the canopy frame can be rotated by pulling a rope attached to a part of the lever of the canopy frame.
A coil spring is provided between the support column and each hood frame, and the direction of biasing the hood frame is reversed during opening and closing of the hood frame.

According to this conventional structure, when opening the top frame, the rope is initially pulled by the elastic force of the coil spring and the force that overcomes the own weight of the top frame, and then the elastic biasing force of the coil spring against the top frame is applied. After the hood is reversed, the elastic contracting force moves the hood frame to the fully open state.

However, in the conventional device, as mentioned earlier, when the top frame is initially opened, in addition to the own weight of the top frame, the elastic force of the coil spring acts in the direction of closing the top frame, so it is difficult to lift the top frame. This requires considerable effort and places a heavy burden on the worker.

In addition, after the elastic biasing force of the coil spring is reversed, the movement of the canopy frame becomes rapidly rapid, combined with the operator's previous opening operation force, and the impact when the canopy frame is fully opened is large and can easily damage the sail device. There is a problem.

The present invention has been made in view of the above-mentioned problems, and a torsion bar is arranged near the center of the loading platform with respect to the rotating shaft of the top frame, and the end of the shaft supporting side is connected to the top frame through an arm member. It is an object of the present invention to solve the problems of the prior art by providing a structure in which the top frame is always elastically biased in the opening direction in conjunction with the top frame.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, substantially U-shaped supports 3 are provided at the front and rear ends of the loading platform 2 of a truck 1, respectively.
, 3' are fixedly installed, and two rotating shafts 4 and 4', which also serve as cross beams in the longitudinal direction of the loading platform, are installed parallel to each other with an interval between both columns 3 and 3', and at the center of the upper end of the columns 3 and 3'. Bearings 5, 5' installed in
It will be installed rotatably through the Then, each rotating shaft 4
, 4' by welding or bolting, etc., to form a pair of abbreviated canopy frames 6, 6' between the pillars 3, 3', which can open and close the sides of the loading platform 2. Although not shown, a hood cloth is stretched over the pair of hood frames 6, 6'. Also,
The rotational shafts 4, 4' are closer to the center than the rotational shafts 4, 4'.
Between 4' and 6', the opening direction of each canopy frame 6 and 6' is shown.
That is, a total of four torsion bars 7.7' are attached to each of the canopy frames 6, 6', for example, to apply elastic force in an upward direction at all times.

The details of this torsion bar mounting structure are shown in FIG.

Incidentally, since the mounting structure of each torsion bar is the same, only the - part will be explained here and the others will be omitted.

One end of the torsion bar 7 is fixed to a bracket 10 fixed with a bolt 9 to a hollow pipe 8 passed through the rotating shaft 4, and the other end is freely rotatably attached to a bearing 12 provided on the support column 3 via a bracket 11. It is attached. A base end of a first arm member 14 having a pin 13 at its tip is fixed to the end of the torsion bar 7 on the side supported by the bearing 12, and the pin 13' f:,
A second arm member 15 is paired with the first arm member 14 and is fixed to the pipe material at the end of the hood frame 6 and the tip of the rotating shaft 4.
It is slidably engaged with a long hole 15a formed parallel to the pipe material. A platen 10 fixing one end of the torsion bar 7 is installed between the rotating shafts 4 and 4' via hollow pipes 8 and 8' (see FIG. 1).

Next, the effect will be explained.

First, in this embodiment, the torsional torque of the torsion bars 7, 7' is applied to the force necessary to open the hood frames 6, 6' shown by solid lines in FIG. The force acting in the opening direction of 6' is shown by the broken line in FIG. That is, the acting force by the torsion bar 7, γ' is greater at the beginning of opening of the top frame 6° 6' and when it is nearly fully opened, and is lower than the acting force during opening.

In such a relationship between the two, the opening operation of the hood frames 6, 61 will be explained with reference to FIG. 2. First, when the locking device (not shown) that fixes the canopy frame 6 in a closed state at a suitable position on the loading platform 2 is unlocked, the acting force of the torsion bar 7 to which a predetermined torsional torque has been applied is applied to the first It acts on the hood frame 6 through the pin 13 of the arm member 14 and the second arm part 15, and the hood frame 6 is automatically rotated upward about the rotating shaft 4 and opened. Then, while the acting force of the torsion bar 1 and the acting force due to the own weight of the top frame 6 and the force in the opposite direction (indicated by the solid line in FIG. The attached rope (not shown) is pulled to make up for the shortfall, and the hood frame 6 is brought close to being fully opened. After that, the top frame 6 is automatically rotated again to the fully open position shown by the dashed line by the acting force of the torsion bar 7.

Incidentally, the force acting on the torsion bar 7 in the opening direction of the top frame 6 is related to the torsional torque of the torsion bar 7 and the distance from the center of the rotation axis of the top frame 6 to the pin 13. By variously changing the setting relationship in the design stage, the acting force by the torsion bar can be set as shown by the one-dot chain line or the two-dot chain line in FIG.

In this way, the force acting in the opening direction on the top frame 6, 6' is transmitted not by the coil spring but by the torsion bars 7, 7'.
3, it is possible to set an acting force that is not much different from the opening force curve of the top frame shown by the solid line in FIG. Therefore, even if manual operation by the operator is required during the opening operation of the canopy frames 6, 6', the effort required is much smaller than in the conventional system, and there is no burden on the operator. Further, the impact when the top frames 6, 6' are fully opened can be greatly reduced, and the durability of the top frames 6, 61 is improved.

Further, in the above embodiment, the rotation shafts 4 and 4' of the top frames 6 and 6' are
Torsion huff via bracket 10 in between, 7
', but as shown in Figure 4, the support 3
, 3', in the case of a canopy frame structure in which a spine frame 20 made of beam material is assembled parallel to the longitudinal direction of the loading platform, the spine frame 20
As shown in FIG. 5, there are brackets 21 and bearings 2 on both sides of the
2 may be fixed respectively and torsion bars may be attached to these.

As described above, according to the present invention, instead of a conventional coil spring, this torsion bar is placed near the center of the cargo bed and the rotation axis of the top frame body, and the torsion bar is used for a torsion bar. Since the body is always elastically biased in the opening direction, the difference between the force required to open the frame and the force acting on the frame of the elastic body during the opening operation of the canopy frame is compensated for when the canopy is fully opened. It is possible to set it small in the degree position.

Therefore, the labor of the operator when opening and closing the hood frame can be significantly reduced, and the impact when the hood frame is fully opened can be alleviated, thereby extending the life of the hood frame.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is an enlarged perspective view of the main part of the same embodiment, and Fig. 3 is the relationship between the hood frame opening force of the torsion bar and the hood frame opening degree. FIG. 4 is a perspective view showing another embodiment of the present invention, and FIG. 5 is an enlarged perspective view of essential parts of the same embodiment. 2...Loading platform 3,3'...Strut 4,4'...
・Rotating shaft 6, 6'...Top frame 7, 7'...
Torsion bar 13...pin 14...first
7. Arm member 15...Second arm member 15
a...Long hole patent Applicant: Hiro Engineering Co., Ltd. Representative Patent Attorney Fujio Sasashima 13E Procedural amendments stamped July 30, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1 1957 Patent Application No. 192522 2, Title of the invention: Trunk loading platform top opening/closing device 3, Relationship to the case of the person making the amendment Patent applicant address: 1-10-3 Aiza, Ageo City, Saitama Prefecture Name:
Hiro Engineering Co., Ltd. Representative Nene Sekine
4th year of Showa, agent address: Daisan Mori Building, 1-4-10 Nishi-Shinbashi, Minato-ku, Tokyo! ! 1 508-9577 Name Patent Attorney (7833) Fujio Sasashima 5, Subject of amendment 6, Contents of amendment (1) The "Claims" will be amended as shown in the attached sheet. (2) The phrase "coupled" on page 3, line 11 of the specification does not mean "coupled, and the coupling end of this arm member is torsioned against the rotating shaft in the closed state outside the top frame." Please freely slide and engage the position on the opposite side.'' (3) On page 8, line 8 of the specification, the phrase “arranged,” was replaced with “
The arm member is arranged and engaged with the arm member in a position opposite to the torsion (torsion)<- with respect to the rotation axis. What is claimed above: A substantially U-shaped support is fixed to the front and rear of the loading platform, respectively, and a pair of hoods framed in an abbreviated shape are attached to two rotating shafts arranged in parallel between the upper ends of the supports. Attach each frame,
In a truck loading dock opening/closing device configured to open and close the side of the loading platform by rotating the top frame via a rotating shaft, a torsion bar, one end of which is fixed and the other end rotatably supported, is rotated. The torsion bar is provided at a position closer to the center of the loading platform than the shaft and parallel to the rotating shaft, and the shaft support side end of the torsion bar is connected to the top frame via an arm member, and the torsion bar supports the top frame. An opening/closing device for a truck bed top, characterized in that the opening/closing device for a truck bed hood is configured to be always elastically biased in the direction of the opening blade. 139-

Claims (1)

[Claims] Approximately U-shaped pillars are fixed to the front and rear parts of the loading platform, respectively, and a pair of canopy frames each having an abbreviated shape are attached to two rotating shafts arranged in parallel between the upper ends of the pillars. Installation,
In a truck loading platform opening/closing device configured to open and close the loading platform side by rotating the top frame via a rotating shaft, a torsion bar, one end of which is fixed and the other end rotatably supported, is rotated. The torsion bar is provided at a position closer to the center of the loading platform than the shaft and parallel to the rotating shaft, and the shaft support side end of the torsion bar is linked to the top frame via an arm member, so that the torsion bar supports the top frame. An opening/closing device for a truck bed top, characterized in that it is configured to be always elastically biased in the opening direction.