JP3490263B2 - Opening / closing mechanism of door - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for opening and closing a tilt door which constitutes a side surface of a cargo bed of a truck,
In particular, the present invention relates to an opening / closing mechanism in which a drive device for opening and closing the tilt door and a locking device for locking the tilt door are interlocked.

[0002]

2. Description of the Related Art Generally, a tilting door provided on a truck bed is very heavy, and opening or closing the tilting door when loading or unloading a load makes work harsh. . Therefore, conventionally, an auxiliary device has been developed that incorporates a spring that urges the tilting door in the closing direction, and this was designed to reduce the weight of the tilting door by the spring pressure.

On the other hand, in the prior art relating to the locking device, Japanese Utility Model Publication No. 6-42551 and Japanese Utility Model Publication No. 7-18.
There was a locking device described in the '950 publication. The former of these locking devices has a structure in which the oscillating plate can oscillate according to the movement of the slide plate that moves up and down inside the pillar of the loading platform. By rotating, the locking plate continuous with the tilt is pulled to complete the lock. In the latter case, the locking plate engaging with the hook protruding from the pillar of the cargo bed causes the locking plate continuous with the tilt. In the structure, the hook is tapered downward, and the hook engaged with the hook is lowered to sufficiently hold the hook.

[0004]

However, in the above assisting device for opening and closing the tilting door, only the weight of the tilting door is reduced by the spring, and the opening and closing drive is not performed. It had to be opened and closed by hand, and although it had a slightly lightweight feel, it had to be opened and closed. Therefore, there are those that try to rotate the tilt door by the rotational force of the hydraulic motor or electric motor, but unlike driving the tilt door from above the cargo bed by pulling force, while supporting the tilt door from the bottom of the cargo bed. Since it had to be opened and closed, a powerful driving force was required and it was a heavy equipment.

On the other hand, in the above-mentioned locking device, the driving means for operating the raising and lowering of the slide plate and the latch are individually provided, and the driving force from the driving means is used both for locking and unlocking. Therefore, the slide plate or the latch has to be moved up and down, and the driving means has to be operated when opening and closing the swing door, which is very troublesome. In view of the above points, the present invention is configured by a swing door opening / closing drive device that can be operated by a small drive device, and a locking device that interlocks with the opening / closing drive device.
The purpose is to provide an opening / closing mechanism that automates the opening and closing of the tilt door.

[0006]

According to the present invention, there is provided a floor plate constituting a bottom surface, pillars standing upright at four corners of the floor board, and a side surface between two pillars pivotally mounted on the floor board. In a truck bed having a tilting door that constitutes a tilting door, an actuator that expands and contracts at a lower part of a floor plate, a swinging member that is arranged with its longitudinal direction facing up and down and that swings by expanding and contracting the actuator, and a tilting door are closed. The door support member whose tip is pivoted above the pivoting position of the swing door, the bulge portion bulging toward the swinging member at the other end of the door support member, and the door. A first transmission member that is provided between the other end of the support member and the lower end of the swing member to interlock them, and between the bulge-side tip of the bulge portion and the upper end of the swing member. From the second transmission member that is provided and links both A drive mechanism for opening and closing a sliding door, a locking body that is rotatably supported inside the pillar, and a part of the locking body that is shaped like a hook and projects outward from the pillar. A locking end, an arcuate surface formed in an arc shape centered on the shaft support portion of the locking part body, and a linear member whose tip is fixed to the locking part body while contacting the arcuate surface, An engaged portion projecting on the tilting door so as to be engaged with the inside of the hook-shaped engaging end and an opposite side of the engaged portion so that the engaged surface can slide on the outer surface of the hook-like engaging end. And a locking device for the tilting door, which comprises a sliding contact portion protruding from the actuator, and the base of the actuator in the tilting door opening / closing driving device is installed on a turning member that can be turned within a desired range. The other end of the linear member in the locking device for the tilting door is connected to the tip of the turning member on the turning side. The opening and closing mechanism and gist.

The swinging member is a swinging member composed of a long arm provided below the center of swinging and a short arm provided above the center of swinging. It is preferable that the short arm of the swing member is provided at an angle to the long arm. Further, it is preferable that the actuator is an actuator including a rod that allows the rotation of a DC motor to advance and retreat, and has a structure having a load holding function. further,
It is preferable that the bulging portion is a substantially triangular bulging portion, and one side thereof overlaps with the door supporting member, and one apex not adjacent to each other faces the inside of the luggage carrier.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to an opening / closing mechanism of a tilt door provided on a truck bed, and as shown in FIG. 1, a bottom edge of a tilt door 3 has a plurality of hinges 4 on a bottom surface of a truck bed 2 of a truck 1. It is configured so that it can be rotated by. Therefore, the opening / closing drive device 10 for the tilt door 3 is configured to support the tilt door 3 above the hinge 4. Pillars 5 and 6 are formed on the loading platform 2 from the bottom surface upward, and the upper portion of the tilt door 3 is locked to the pillars 5 and 6 so that the tilt door 3 is maintained in a closed state. . Therefore, the locking plates 7 and 8 continuous to both ends of the tilt door 3 are provided so as to project toward the columns 5 and 6, and the locking plates 7 and 8 are engaged in a state of contacting the surfaces of the columns 5 and 6. It will be stopped.

Next, details of the opening / closing drive device 10 for the tilt door 3 will be described. As shown in FIG. 2, the opening / closing drive device 10 is provided with a door support member 11 for supporting the tilt door 3, and the tip 12 is pivotally mounted at a position higher than the hinge 4 of the tilt door 3. The weight of the tilt door 3 can be supported, and the tilt door 3 can be rotated around the hinge 4. On the other hand, below the floor plate 2a that constitutes the bottom surface of the loading platform 2, an actuator 13 is provided laterally, and a rod 14 that can be advanced and retracted by the rotational force of a DC motor is incorporated. This rod 14
The tip of is pivotally attached to an appropriate portion of the swing member 15,
Further, the swinging member 15 is rotatably supported by the base portion 2b continuous with the floor plate 2a, and the swinging member 15 swings around the shaft supporting portion 16 in accordance with the advance / retreat of the rod 14. There is. The lower side of the pivot member 16 of the swing member 15 is a long arm 15a that swings largely, and conversely, the upper arm is a short arm 15b that swings slightly. Here, the actuator 13 used in this embodiment is a Warner linear actuator D24-2 manufactured by Shinko Electric Co., Ltd.
This actuator is a 1B5-08 type, and this actuator has a structure in which a motor operated by a voltage of 24 volts rotates a screw shaft to move a rod screwed into the screw forward and backward, and a lap spring type holding brake. Since the load holding mechanism is provided, the load applied to the rod can be held even when the rotation of the motor is stopped.

A substantially triangular bulge 17 is provided at the lower end of the door support member 11 described above, and the door support member 11 coincides with one side of the triangle of the bulge 17 and the other two sides. Loading platform 2
It is configured so as to protrude toward the lower side. Then, the tip end 18 a of the swinging member 15 and the lower end portion 1 of the bulging portion 17
A first transmission member 20 is provided between the first and second members 9 and 9, and the movement of the tip 18 accompanying the swing of the swing member 15 is transmitted to the bulging portion 17. Also, the substantially triangular bulge 17
Of the bulging-side tip 21 and the swinging member 15
The second transmission member 22 is provided between the tip 18b of the short arm 15b and the movement of the short arm 15b accompanying the swing of the swing member 15 is transmitted to the bulge side tip 21. It has become.

Since the present embodiment has the above-described structure, the forward movement of the rod 14 by the actuator 13 causes the swing member 15 to swing (counterclockwise in the figure), and the long arm accompanying this swing. The movement of the tip 18 of the 15a causes the first transmission member 20 to draw the lower end 19 of the bulging portion 17,
Since the second transmission member 22 pushes away the bulging-side tip 21 of the bulging portion 17 by the movement of the tip 18b of the short arm 15b, the entire bulging portion 17 is in the couple direction (counterclockwise in the figure) at that location. ) Can be rotated to. At this time, the upper end 12 of the door support member 11 can be moved in the tangential direction of a circle centered on the hinge 4 by the rotation of the bulging portion 17, and the tilt door 3 can be smoothly opened. On the contrary, when the tilt door 3 is closed, the backward movement of the rod 14 by the actuator 13 causes the swinging member 15 to swing (clockwise in the figure), and this swinging causes the bulging portion 17 to be different from the above. It can be rotated in the opposite direction (clockwise in the figure). By the rotation of the bulging portion 17 at this time, a force can be applied to the front end 12 of the door supporting member 11 in the direction of closing the circle in the tangential direction of the circle centered on the hinge 4 (rightward in the figure). The heavy swing door 3 can be reliably closed.

The force acting when the rod 14 of the actuator 13 rotates the swing member 15 is a compressive force only at the moment when the tilting door 3 to be closed is opened, and is a tensile force at other times. If the actuator 13 can withstand the tensile force rather than the compressive force, it is not necessary to endure the compressive force. That is, when the tilting door 3 to be closed is activated, it is necessary to move the front end 12 of the door support member 11 sideways in order to tilt the tilting door 3, but once the tilting tilting door 3 has its weight, Acts downward, and this weight is supported by the door support member 11. As a result, the tilt door 3 is subjected to weight in the direction of opening itself, and the swinging member 15 is forcibly rotated. It will act to try to let it do. At this time, in order to smoothly rotate the swinging member 15 by the actuator 13 without being forced by the weight of the swing door 3, the actuator 13 is used that can withstand such a pulling force. is there.

The body-side base of the actuator 13 is pivotally supported by a rod-shaped rotating member 23, and the rotating member 23 has one end 24 rotatably provided. Further, a stopper 25 is attached near the rotating member 23, and the rotation thereof is regulated so as to be within a predetermined range. The actuator 13 is pivotally supported near the rotary shaft 24 of the rotary member 23, and the free end 26 is provided with the wire 2
7 is fixed. Therefore, when the actuator 13 is started in order to open the tilting door 3 in the closed state, the rotating member 23 is first driven by the compressive force of the actuator 13.
Rotates slightly (counterclockwise in the figure) and pulls the wire 27 fixed to the free end 26 of the rotating member 23. The wire 27 is continuous with the wire 29 (35) through the expansion member 28.

Next, the locking device of this embodiment will be described. As shown in FIG. 3, most of the locking device 30 of the present embodiment is provided inside the hollow column 6 that constitutes the platform. A relatively long locking portion main body 31 is provided in a laterally long state inside the pillar 6, and is pivotally supported by a pivotal support portion 32 near one end (right end in the figure) of the pillar 6 so as to be freely rotatable. Has become. For this pivotal support, a support plate 33 protruding inward from a part 6a of the column 6 is provided. Further, on the inside of the pillar 6, the shaft supporting portion 3 is attached to the locking portion main body 31.
An arcuate surface 34 (whose surface is constituted by the wall thickness of the engaging portion main body) formed in an arcuate cross-section centering on 2 is provided, and the wire 35 is brought into contact with this arcuate surface 34. The tip of the wire 35 is fixed to the locking portion main body 31. Further, the other end of the locking portion main body 31 (the left end in the figure)
36 is located outside the pillar 6 and is provided with a hook-shaped locking end 37 facing downward. The wire 35 is the same as the wire 29 (35) in the opening / closing drive device (FIG. 2) and is continuous with the wire 27 fixed to the free end 26 of the rotating member 23 of the opening / closing drive device. Therefore, when pulling the wires 27, 29 (35) by starting the actuator 13 as described above, the locking portion main body 31 can be rotated about the shaft support portion 32. Further, since the shaft supporting portion 32 is separated from the locking end 37, and the center of gravity of the locking portion main body 31 is close to the locking end 37 from the shaft supporting portion 37, when the wire 35 has no tensile force, Its own weight acts so as to lower the toe 37. On the other hand, a locked portion 39 that is locked by the inner side 38 of the locking end 37 is projectingly provided on the outer surface of the locking plate 8 that is continuous with the tilting door 3, and the inner side 3 of the locking end 37
The whole of 8 abuts on the locked portion 39 to eliminate play at the time of locking. Further, the locking end 37 is provided on the inner surface of the locking plate 8.
The sliding contact portion 41 is provided in sliding contact with the outer side 49 of the sliding contact portion 41. When the tilting door 3 is closed, the sliding contact portion 41 collides with the outer side 40 of the locking end 37 and engages the surface of the sliding contact portion 41. By sliding the outer side 40 of the toe 37, the engaging end 37 can be guided in a desired direction (upward). At this time, the tangential direction when the outside 40 of the hook-shaped locking end 37 and the surface of the sliding contact portion 41 that has a gentle curve and protrudes is the direction in which the tilt door 3 closes. On the other hand, the direction is oblique, so that the impact when the two collide can be alleviated and the locking end 37 can be smoothly guided. Moreover, the contact area between the outer side 40 of the hook-shaped engaging end 37 and the surface of the gently curved sliding contact portion 41 is very small, and the frictional resistance when the outer side 40 of the engaging end 37 slides is very small. It is possible to An escape hole 42 is provided in a part 6a of the pillar 6 so that the sliding contact portion 41 does not contact the pillar 6.

Next, the mode of operation of this embodiment will be described. First, when the tilt door 3 is closed, as shown in FIG.
2, the hook-shaped locking end 3 of the locking portion main body 31
7 projects from the pillar 6 and locks the locked portion 39 of the locking plate 8. On the other hand, in the opening / closing drive device 10, as shown in FIG. 2, the rod 14 of the actuator 13 is contracted, and the rotating member 23 on which the base of the actuator 13 is pivotally supported is rotated by the stopper 25. It is in a regulated state.

In the above-mentioned state, no driving force is applied to the opening / closing drive device 10 or the locking device 30. Therefore, by operating the actuator 13 of the opening / closing drive device 10, the rod 14 is extended. As the extension proceeds, the main body of the actuator 13 is pushed and the rotating member 23 is rotated. At the time of this rotation, only the base portion of the main body of the actuator 13 moves, and the swinging member 15 and other members do not change. This is because the upper portion of the swing door 3 is locked by the locking device, and therefore the door support member 11 cannot be moved.

Therefore, the turning of the turning member 23 is performed by the wire 2
7, 29 (35) are attracted, and the pulling of the wire 35 causes the locking portion main body 31 to gradually rotate. This rotation increases, and the locking portion main body 31
When the locking end 37 of the is separated from the locked portion 42, the locking end 3
The locking by 7 will be released. When the swing door 3 is released, the swing door 3 can be opened around the hinge 4, and when the swing door 3 is slightly opened, the weight of the swing door 3 acts on the actuator 13 to cause the actuator 13 to move.
A tensile force will act on. As a result, the rotating member 2
3 is returned to the stopper 25 and the wires 27, 29 (3
5) is loosened, and the locking portion main body 31 returns to its original state by its own weight.

When the operation of the actuator 13 is continued, as shown in FIGS. 6 and 7, the swinging member 15 is rotated so that the tilting door 3 can be opened by the first transmission member 20, the door supporting member 11, and the like. Of. At this time, the door support member 11 supports the weight of the tilting door 3 to be opened, and is further dispersed by the first transmission member 20 and the second transmission member 22. The weight distributed to the first transmission member 20 acts on the swinging member 15 in the rotating direction (counterclockwise direction in the drawing), so that a tensile load acts on the actuator 13. Therefore, the rotation member 23 maintains the state in which the rotation is restricted by the stopper 25.

When the swing door 3 is closed, as shown in FIGS. 7 and 8, the actuator 13 is actuated and the rod 14 is contracted to move the swing member 15 in the reverse direction (clockwise direction in the drawings). ) Rotate to. This rocking member 1
The rotation of 5 causes the door support member 11 to push up the door 3. In this way, when the tilt door 3 is closed, the sliding contact portion 41 of the locking plate 8 comes into contact with the outside 40 of the locking end 37 of the locking portion main body 31, as shown in FIG. As the stop plate 8 approaches the pillar 6, the outer side 40 of the locking end 37 slides on the surface of the sliding contact portion 41 and moves upward while being guided by this surface shape. By this rise, the locking portion main body 31 rotates around the shaft support portion 32. When the locking end 37 is sufficiently raised and the locking end 37 exceeds the upper edge of the locking plate 8, the locking end 37 is lowered by its own weight, and the inner side 38 of the locking end 37 is locked. It comes into contact with the portion 39. In this way, the locking plate 8 is locked by the locking portion main body 31. The lateral movement of the sliding contact portion 41 as described above is imparted by the bulging portion 17. That is, when the swinging member 15 swings, the long arm 15a thereof faces outward under the bulging portion 17 (toward the left in the drawing).
In addition, since the short arm 15b acts so as to move the upper side of the bulging portion 17 inward (to the right in the drawing), the bulging portion 17 rotates in the couple direction (clockwise direction in the drawing). A force is applied, and this rotating force is applied to the door support member 11
The tip 12 of this is moved laterally, which is the tangential direction of the circular motion.

Needless to say, various embodiments can be adopted without departing from the spirit of the present invention. In the embodiment described above, the free end 26 of the rotating member 23 on which the base of the actuator 13 is pivotally supported.
The expansion member 28 is interposed between the wire 27 connected to the wire 27 and the wire 35 fixed to the locking portion main body 31. This is for increasing the pulling amount of the wire 35. If the wire 35 can rotate the locking portion main body 31 to a predetermined state, both wires 2
It is also possible to directly connect 7, 35. On the contrary, when a larger tensile force is required, the expansion member 28 of the same kind may be further interposed. Further, the shapes of the locking portion main body 31, the locked portion 39, and the sliding contact portion 41 in the locking device 30 can be changed in addition to those shown in the drawing. Further, the locking portion main body 3 in the locking device 30
With respect to the rotation of 1, the rotation in one direction is operated by the wire 35, and the rotation in the other direction is configured by the weight of the locking portion main body, but the rotation in this direction is swift and reliable. In order to do so, a spring that biases in that direction may be provided.

[0021]

As described above, according to the present invention, when the tilt door is opened, the opening / closing drive device is started to pull and lock the linear member fixed to the locking portion main body. It is possible to rotate the main body of the part, and by this rotation, the locking of the tilting door by the locking end is released. Further, when the swing door is closed, the swing door can be rotated in the closing direction by contracting the actuator of the opening / closing drive device, and the slide contact portion provided on the swing door is closed immediately before the swing door is closed. The locking part body slides up against the outer surface of the locking end of the locking device and pushes up the locking part body, and when this sliding contact part passes through the locking end, the locking part body lowers and the inside of the locking end is locked. The part is abutted and locked. Therefore, the opening and closing of the swing door can be performed only by operating the opening / closing drive device, and since the operation of the actuator is stopped, no complicated operation is required and automation is realized.

In the swing door opening / closing mechanism according to the present invention, the swing member includes a long arm provided below the center of swing and a short arm provided above the center of swing. If the swinging member is constituted by, the swinging of the swinging member acts so as to appropriately rotate the bulging portion when the tilting door is standing, and this rotation causes the swinging of the door supporting member. It is possible to move the upper end in a direction close to horizontal, which makes it possible to open and close the tilt door smoothly. Moreover, by providing the short arm of the swinging member at an angle with respect to the long arm, the transmission of the driving force for rotating the bulging portion can be ensured.
In addition, the actuator is an actuator including a rod that allows the rotation by a DC motor to advance and retreat,
With a structure that has a load holding function, even when the actuator is stopped while the swing door is opening and closing,
Since the tilting door can be maintained in a stopped state, the tilting door does not open naturally even if it is misoperated. Furthermore, the bulging portion is a bulging portion having a substantially triangular shape, and one side overlaps with the door support member, and one apex not adjacent to each other is configured to face the inside of the luggage carrier, thereby forming a substantially triangular shape. The rotating state of the bulging part can be changed according to the size, which is convenient when adapting to many types such as the size and weight of the tilt door.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an entire track.

FIG. 2 is a sectional view taken along line II-II.

FIG. 3 is a sectional view taken along line III-III.

FIG. 4 is an explanatory diagram showing a mode of operation of the embodiment.

FIG. 5 is an explanatory diagram showing a mode of operation of the embodiment.

FIG. 6 is an explanatory diagram showing a mode of operation of the embodiment.

FIG. 7 is an explanatory diagram showing a mode of operation of the embodiment.

FIG. 8 is an explanatory diagram showing a mode of operation of the embodiment.

FIG. 9 is an explanatory diagram showing a mode of operation of the embodiment.

[Explanation of symbols]

1 track 2 loading platform 3 tilt door 4 hinges 5,6 pillars 7,8 locking plate 10 Open / close drive 11 Door support member 13 Actuator 15 Swing member 15a long arm 15b short arm 17 Bulging part 20 First transmission member 22 Second transmission member 23 Rotating member 25 stopper 27,29,35 wire 30 locking device 31 Locking body 32 shaft support 34 arc surface 37 Locking end 39 Locked part 41 Sliding contact

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-58350 (JP, A) Actually opened 54-65115 (JP, U) Actually opened 5-65766 (JP, U) Actually opened 58- 9879 (JP, U) Actual flat 5-35561 (JP, U) Actual flat 7-18950 (JP, U) Actual flat 6-42551 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 33/03 B62D 33/037

Claims (5)

(57) [Claims] 1. A floor plate that forms a bottom surface, columns that stand upright at the four corners of the floor plate, and a tilt door that is pivotally attached to the floor plate and that forms a side surface between two columns. In a truck bed, an actuator that expands and contracts at the bottom of a floor plate, a swinging member that is arranged with its longitudinal direction facing up and down and swings by the expansion and contraction of the actuator, and a shaft of the swinging door when the swinging door is closed. A door support member whose tip is pivoted above the mounting position, a bulge portion that bulges toward the swing member at the other end of the door support member, the other end of the door support member, and the sway. A first transmission member that is provided between the lower end of the moving member and interlocks them, and a first transmission member that is provided between the bulging-side tip of the bulging portion and the upper end of the swinging member to interlock them. Opening / closing drive device for tilting door consisting of two transmission members When, a locking body which is rotatably supported in the interior of the pillar,
A locking end formed by forming a part of the locking portion main body into a hook shape and projecting outward from the column, and an arcuate surface formed in an arc shape centered on the shaft supporting portion of the locking portion main body. A linear member whose front end is fixed to the locking portion main body while being in contact with the arcuate surface, and a locked portion protrudingly provided on the sloping door so as to be locked inside the hook-shaped locking end. A tilting door locking device comprising a sliding contact portion protruding on the opposite side of the locked portion so as to be capable of sliding contact with the outer surface of the hook-shaped locking end. The base of the actuator in the opening / closing drive is installed on a rotating member capable of rotating within a desired range, and the other end of the linear member in the locking device for the tilt door is connected to the tip of the rotating member on the rotating side. The opening and closing mechanism for the tilting door. 2. The swinging member, wherein the swinging member comprises a long arm provided below the center of swinging and a short arm provided above the center of swinging. The opening / closing mechanism for the tilt door according to Item 1. 3. The opening / closing mechanism for a tilting door according to claim 2, wherein the short arm of the swinging member is provided at an angle with respect to the long arm. 4. The swing door opening / closing mechanism according to claim 1, wherein the actuator is an actuator equipped with a rod that allows the rotation of a DC motor to advance and retreat, and has a structure having a load holding function. . 5. The bulging portion is a substantially triangular bulging portion, and one side thereof overlaps with the door supporting member, and one apex not adjacent to each other faces the inside of the luggage carrier.
The opening / closing mechanism for the tilting door according to any one of 1 to 4.