JPH06106988A - Opening and closing device for hood for cargo vehicle - Google Patents

Abstract

PURPOSE:To provide an opening and closing device for a hood for a cargo vehicle which can enhance the working efficiency of cargo handling and which does not require a large working space. CONSTITUTION:In an opening and closing device for a hood for a cargo vehicle in which columns 12 are planted at the front and rear ends of a load-carrying platform of a cargo vehicle, and a hood with which the load-carrying platform is covered through the intermediary of the columns 12, is elevated along the columns 12, A drum 26 for winding up the hood stretched between the front end columns and the rear end columns, and a pulley coaxial with the drum 16, having an outer diameter larger than that of the drum are provided. Further, a wire is wound at one end on the pulley and is connected to at its other end the lower part of the hood after being turned back around the lower part of the load-carrying platform, and a drive mechanism 24 drives to the drum 26 which is therefore rotated normally or reversely. A friction transmission mechanism is provided between the drum 26 and the pulley, for rotating the pulley together with the drum 26 when the tension of the wire 48 wound around the pulley becomes lower than a predetermined value, and for allowing the pulley to slip relative to the drum 26 when the tension is higher than the predetermined value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for a luggage carrier sail.

[0002]

2. Description of the Related Art A luggage carrier, such as a truck carrier, has a structure in which a sail is attached to a frame body that is normally erected on the carrier or, for example, a box-shaped frame made of aluminum is attached to the carrier. The one in which the sail is attached to the frame body has problems that the sail flutters while the sail is running and rainwater or the like enters the cargo bed. On the other hand, in the case of the box form, only the rear surface of the loading platform can be opened and closed, and the cargo handling work is usually performed using the rear surface of the loading platform. Since the bed of the luggage carrier is long in the front-rear direction, the cargo handling work from the rear side requires a lot of labor and time because the frontage is narrow and the depth is deep. Therefore, in recent years, there is a box-shaped luggage carrier structure in which the left and right wall surfaces open and close in a so-called gull wing shape with the substantially central portion of the luggage carrier ceiling as a fulcrum. According to this, since the left and right side surfaces of the cargo bed are opened and closed, there is an advantage that the cargo handling work is extremely efficient as compared with the case where the cargo handling work is performed from the rear surface.

[0003]

However, in such a so-called gull-wing-shaped cargo bed opening / closing structure, a sufficient lateral distance equal to or larger than the width of the track is required for opening / closing the side wall, and When these side walls are fully opened, the side walls are located above the ceiling of the truck, and therefore a sufficient space is required even in the upper portion of the truck.
However, there are not always sufficient widths and heights where cargo handling work can be performed, and rather such cargo handling work often has to be performed in a relatively limited space. There is a problem that the gull-wing type opening / closing structure cannot be adopted.

In view of the above problems of the prior art, the object of the present invention is to improve the work efficiency of the cargo handling work while ensuring a reliable protection wall against the cargo of the bed even against wind and rain. Moreover, it is to provide an opening / closing device for a sail for a luggage carrier that does not require a large working space.

[0005]

SUMMARY OF THE INVENTION In order to achieve such an object, the present invention is a pillar that is erected on at least a front portion and a rear portion of a luggage carrier of a luggage carrier, each of which has a substantially gate shape in the width direction. And a sail that is spanned between the struts and is moved up and down along the struts, and covers at least the side surface of the loading platform when descending, and between the struts, and is spanned to a position near the center in the width direction of the substantially gate-shaped upper side of the struts, A luggage transporting machine comprising a rotating drum for winding and unwinding a sail, and a side surface of the loading platform and a surface of the upper surface of the loading platform near the end in the width direction are opened when the sail is wound by the drum. An opening and closing device for a vehicle sail is provided. Here, the rotating drum is preferably biased in the winding direction of the sail, and it is preferable to provide a driving means for lowering the sail against the biasing force. The invention according to claim 4 is an opening / closing device for a luggage carrier sail, comprising a pulley coaxial with a rotating drum and having an outer diameter larger than the drum, and one end of which is wound around the pulley. After the other end is folded back at the lower part of the loading platform, a wire connected to the lower part of the sail, a drive mechanism that drives the drum so that it can rotate forward and backward, and a wire that is provided between the drum and the pulley and that winds the pulley. A friction transmission mechanism for rotating the pulley integrally with the drum when the tension of the pulley is less than or equal to a predetermined value, and sliding the pulley with respect to the drum when the tension is equal to or greater than the predetermined value. It is a thing.

In the above description, the wire is folded back by a pulley disposed under the cargo bed, and the pulley is supported by the cargo bed so as to be vertically movable within a certain range and is always urged downward. Is good.

Further, it is preferable that each of the columns has a substantially gate shape, and the drum is arranged at an upper portion of the substantially gate type column and closer to the center than the left and right ends thereof.

[0008]

Since the drum for winding the sail is arranged at the upper part of the support column and closer to the center than the left and right ends, the upper part of the loading platform near the left and right ends is open when the sail is fully opened. As a result, even when the luggage is stored in the loading platform from above by, for example, a hawk lift or a crane,
The ceiling of the cargo bed will not be an obstacle, and the cargo handling work can be performed more efficiently. According to the invention described in claim 4, when the sail is in the fully open state, the wire connected to the lower end of the sail is wound around the pulley and at the same time the drum is rotated by rotating the drive mechanism in the direction in which the sail is closed. The sail that had been wound around is unwound. Here, since the outer diameter of the pulley is larger than that of the drum, the wire is wound around the pulley at a faster speed than the unwinding of the sail, and the sail is unwound in a very tight state by the wire. When the tension applied to the wire exceeds a certain value, the friction transmission mechanism causes slippage between the pulley and the drum, which constantly causes the sail to be unwound from the drum with a certain tension, and when the sail is fully closed. Even in the case, the sail will not bend. Here, since the wire is folded back by the pulley arranged at the lower part of the bed, and this pulley is biased downward, the wire itself is also prevented from loosening.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a schematic perspective view of a truck to which an opening / closing device for a luggage carrier sail according to the present invention is applied. FIGS. 2 to 5 show a first embodiment of the present invention, and FIGS. Shows a second embodiment of the invention. Substantially gate-shaped columns 12 are erected at the front and rear ends of the truck bed 10, and the columns 12 are formed with their upper corners smoothly curved. In this embodiment, the truck bed 10
The left and right wall portions are provided with symmetrical opening / closing devices for the sail 14, and in FIG. 1, the left sail 14 is fully open and the right sail 14 is fully closed. See also this truck's bed 1
The rear surface of 0 is normally closed, but is shown here in the open state.

In the first embodiment, each strut 12 is shown in FIG.
As shown in FIG. 5 and FIG. 5, a prism 16 having a rectangular cross section and a substantially crank-shaped intermediate plate 18 extending vertically from the prism 16.
And a guide plate 20 welded to the end of the intermediate plate 18. The column 12 is curved at its upper end portion and extends toward the center, and is connected to a holding plate 22 for holding a drive mechanism or the like described later. That is, the columns 12 at the front and rear ends extend symmetrically about the holding plate 22 in the left-right direction.

As shown in FIG. 3, the holding plate 22 holds the motors 24 and the drums 26 for the columns 12 on the left and right sides symmetrically with respect to the center of the holding plate. FIG. 4 shows in detail the structure of one of the motors and the drum. That is, a pulley 28 is attached to the tip of the rotary shaft 25 of the motor 24, and the rotational power of the pulley 28 is transmitted to the pulley 30 for the drum 26 via the chain 29. The rotation of the pulley 30 is directly transmitted to the drum shaft 32, and the drum shaft 32 has its base end at the drum 2.
6 is inserted in the end plate 34. The base end of the drum shaft 32 is formed into a prismatic shape, and the end plate 34 into which the drum shaft 32 is inserted is inserted.
Also has a shape complementary to this, and therefore the rotation of the drum shaft 32 is transmitted to the end plate 34 as it is. The drum 26 is mounted on the outer periphery of the end plate 34.

A pulley 36 for a wire, which will be described later, is loosely fitted to the outer periphery of the drum shaft 32 near the base end, and the pulley 36 is sandwiched by a pair of friction plates 38, 38 from both sides. The pair of friction plates 38 are attached to the support plate 3 from the outside.
9 and 39, one of which is in contact with the step portion of the drum shaft 32 and the other of which receives two coil springs 40. Since the friction plate 38 and the support plate 39 are fitted in the prismatic portion of the drum shaft 32, they always rotate integrally with the drum shaft. Each coil spring 40 penetrates the end plate 34, extends further in the proximal direction, and is in contact with the pressing plate 42. A long bolt 44 penetrates through the center of the pressing plate 42, the bolt 44 penetrates through the center of the drum shaft 32 and projects outward, and an adjusting nut 46 is screwed therein. That is, the pressing force of the coil spring 40 on the friction plate 38 can be changed via the pressing plate 42 by tightening or loosening the adjustment nut 46. When the gripping force of the pair of friction plates 38 with respect to the pulley 36 is sufficiently large,
The pulley 36 rotates integrally with the drum shaft 32 and then with the drum 26. When the holding force is small, the pulley 36 slips and does not rotate integrally with the drum 26.

The pulley 36 has a larger outer diameter than the drum 26. Also, the drum 2
6, one end of the sail 14 is wrapped around, while the pulley 36
A wire 48 is wound around.

When the sail 14 is fully closed, as shown in FIG. 3, the sail 14 extends outward from the drum 26 and extends along the above-mentioned support 12 to the lower end of the support 12. In the middle of the sail, a plurality of bone columns 50 extending in the front-rear direction are arranged at equal intervals in the vertical direction, that is, the direction in which the sail moves up and down. This bone pillar 50
Is fixed to the sail 14 by being inserted into the bag portion 52 formed on the inner surface of the sail 14 at regular intervals, and reinforces the strength of the sail 14 when fully closed. As shown in FIG. 5, both ends of each bone column 50 have a smaller diameter than the rest, and are inserted into the recesses 54 formed by the guide plate 20 and the intermediate plate 18 of each column 12. , By this sail 1
4 moves up and down along the column 12. The outer surface of the bone column 50 other than both ends is configured to be substantially flush with the outer surface of the guide plate 20. Further, a seal member 56 having a U-shaped cross section is welded to the front and rear end edges of the sail 14 over the entire length in the vertical direction.
The guide plate 20 is mounted so as to sandwich the outer end of the guide plate 20, and thus can be moved up and down along the guide plate 20. Further, the edge of the seal member 56 is covered with a cover 57, and the cover 57 is fixed to the prism 12. As a result, even if, for example, rain enters from the front-back direction of the support column 12, the passage leading to the inside of the sail 14 is covered by the cover 5.
7. The seal member 56 forms a complicated labyrinth shape to prevent water from entering. A reinforcing plate 58 having a predetermined width and having substantially the same longitudinal length as the sail 14 is attached to the lower end of the sail 14. This reinforcing plate 58 is a sail 1
Fold the bottom end of 4 and sail the end 1
A bag is formed by welding to the surface of No. 4, and the bag is attached by being inserted into this bag. Further, a skirt member 60 made of, for example, rubber is attached to the outer side of the lower end portion thereof, and the skirt member 60 extends further below the upper surface of the luggage carrier 10 when the sail 14 is fully closed. End, which prevents water from entering from the side.

The guide plate 20 has its inner side (lower side in FIG. 5) deviated outward in order to prevent only the thickness portion of the seal member 56 from protruding outward. result,
The outer surfaces of the seal member 56, the guide plate 20, and the bone column 50 are all substantially flush with each other. This allows the sail 14
Can ensure that there is no unevenness in the front-back direction. The front and rear ends of the bone column 50 are not in close contact with the sail 14, and the guide plate 20 of the column 12 is sandwiched between them.

The bone column 50 at the lowermost end of the sail 14 except for the front-rear direction end thereof is fixed to the skirt member 60 and the reinforcing plate 5 by bolts 61 attached at predetermined intervals in the front-rear direction.
8 and the sail 14 itself. The other end of the wire 48 wound around the pulley 36 is fixed to the end of the bone pillar 50 at the lowermost end. The wire 48 extends further downward from the bone column 50 at the lowermost end through the floor of the bed 10, extends around the pulley 62 shown in FIG. 3 and extends upward, and inside the prism 16 of the column 12 goes upward. It is wound around the pulley 36 via another pulley 64 that extends and is arranged at the upper end of the column 12. A pulley 62 provided below the floor of the loading platform is swingably supported by the loading platform via an arm 66, and is urged downward by a spring 68 in the middle of the arm 66. That is, even if the wire 48 is loosened, the pulley 62 biased downward prevents the looseness from occurring.

Next, the operation of the embodiment having the above structure will be described.
First, as shown in the left side wall portion of FIG. 1, when the sail 14 is closed from the fully opened state, the motor 24 is driven in the closing direction. As a result, the rotational power of the motor is transmitted to the drum 26 via the pulleys 28 and 30. At the same time, the pulley 36 is clamped with a sufficiently large force by the preset pressing force of the coil spring 40 via the friction plate 38, and the pulley 36 rotates together with the support plate 39 and the friction plate 38 that rotate integrally with the drum shaft 32. To do. As a result, the wire 48 is wound around the pulley 36, and at the same time, the sail 14 is unwound from the drum 26.

The outer diameter of the pulley 36 is the drum 26.
Since it is formed larger than the outer diameter of
Will be wound up faster than the unwinding speed of the sail 14 by the drum 26. Therefore, the sail 14 is always the wire 48
Thus, the sail 14 is unwound in a state of being pulled by a predetermined force, and the sail 14 is prevented from loosening especially in the fully closed state. If the take-up speed of the wire 48 is too high than the take-up speed of the sail 14, a large tension is generated in the wire 48. When this tension exceeds the clamping force of the pair of friction plates 38 applied to the pulley 36 by the coil spring 40, the pulley 36 slips with respect to the friction plate and then the drum shaft 32, so that excessive tension is applied to the wire 48 and the like. Care is taken not to work.

Thus, even when the sail is fully closed, the sail 14 is always placed in a tensioned state and does not loosen, so that the strength is high, and in this embodiment, the bone columns 5 are arranged at appropriate intervals of the sail.
0 is arranged and the front and rear ends of the bone column are inserted into the recesses 54 of the column 12, and the sail is locked to the guide plate 20 of the column 12 via the seal members 56 at the front and rear ends. This structure has a significantly improved strength. Therefore, it is possible to sufficiently withstand the collapse of the load in the cargo bed, and it is also possible to prevent the sail from fluttering even under strong wind conditions.

Further, in such a sail structure, not only the strength problem but also the infiltration of rainwater is an important problem. According to this embodiment, the lower end side surface is sealed by the skirt member 60. , The front and rear ends are covers 57,
Since it is sealed by the sealing member 56, it is possible to reliably prevent water from entering the cargo bed. Especially when the carrier is traveling at high speed, the inner space covered with the sail is in a negative pressure state and tends to positively suck rainwater and the like into the sail together with the air.
Although rainwater could not be reliably prevented from entering, such a problem can be solved by the above configuration.

When opening the sail from the fully closed state, the motor 24 is rotated in the opposite direction. As a result, the sail 14 is wound up on the drum 24, and ascends along the support column 12 to open the side of the cargo bed. At this time, as described above, the pulley 36 is formed to have a larger outer diameter than the drum 26, so that the wire 4 is faster than the winding speed of the sail 14.
There is a possibility that the unwinding speed of 8 increases and the wire 48 bends. However, since the bending of the wire 48 is biased downward by the spring 68 below the loading platform, the wire 48 moves downwards below this pulley 62. The bending of the wire 48 can be absorbed by swinging the wire.

Further, according to the above-described embodiments, the sail winding drum 26 is not provided above the left and right ends of the luggage carrier 10, but is provided at a position deeper toward the center. Therefore, as shown in FIG. 1, when the sail is fully open, the upper portions of the left and right end portions of the platform are open. Therefore, the upper left and right ends of the truck can be used in the cargo handling work, and for example, the cargo can be placed on the cargo bed 10 by simply lowering it from the top of the truck, and the cargo handling work becomes extremely easy. There is.

In the above embodiment, the case where the switchgear is applied to the side surface of the carrier is shown, but the present invention is not limited to this, and the switchgear is applied to the rear surface of the carrier. It goes without saying that you can do it.

Next, a second embodiment of the present invention will be described with reference to FIGS. Here, the same or corresponding portions as those of the first embodiment are designated by the same reference numerals, and detailed description of these portions will be omitted.

The difference between the second embodiment and the first embodiment is that the rotating drum 26 is urged by the spring 72 in the sail winding direction, and the chain 74 extending along the column 12 is extended.
The lower end of the sail is connected to the motor and the chain is driven by a motor so that the sail is unwound against the biasing force of the spring of the drum 26. That is, the pair of left and right columns 12, 12 are connected to each other through the holding plate 22 in each of the front part and the rear part to form a substantially gate shape. A rotary drum 26 is rotatably attached to the holding plate 22 at a position near the center of the upper side of the substantially gate type.
A drum shaft 70 penetrates through the center position of the. Both ends of the drum shaft 70 are fixed to the holding plate 22, and the drum 26 is rotatably supported by the drum shaft 70 via the end plates 34. A pair of the end plates 34 are provided at the front portion and the rear portion, respectively, and a coil spring 72 is interposed between the pair of end plates 34, respectively.
One end of the end plate 34 is fixed to the drum shaft 70 and the other end of the end plate 34
That is, it is fixed to the drum 26 side. As a result, the sail 14 wound around the drum 26 is unwound and the drum 26 rotates, so that the spring 72 is twisted, and the restoring force of the spring 72 causes the rotary drum 26 to move in the sail winding direction. Will be encouraged.

Reference numeral 74 represents a chain, which is wound around a first sprocket 76 supported by the holding plate 22, one of which extends along the outer wall of the prism 16 of each column 12. Then, the second sprocket 78 penetrating the floor of the loading platform 10 and arranged below the loading platform 10.
And then passed through the prism 16 to
Of the sprocket 76. Referring to FIG. 7 showing the sail 14 in the fully closed state in which it is lowered to the lowermost end, the lower end of the sail 14 is attached to the chain 72 by bolts 61.
Are connected via. As shown in FIG. 6, a motor 80, which is a drive source of the chain 74, is fixed to the back surface of the luggage carrier 10, and its output shaft 82 is connected to a transmission shaft 86 extending in the front-rear direction of the luggage carrier via another chain 84. It is connected and it is rotated. The aforementioned second sprocket 78 is attached to the end of the transmission shaft 86. Although FIG. 6 shows only the drive mechanism on the rear side of the loading platform, the drive mechanism on the front side is also driven via the transmission shaft 86.

As shown in FIG. 7, the front and rear ends of the sail 14 extend along the outer surface of the chain 74 when fully closed. At the contact position between the chain 74 and the sail 14, a plurality of friction members 8 are provided.
8 are continuously attached to the chain 74. As shown in FIG. 10, each friction member 88 includes a pair of legs 89 for sandwiching the chain 74 from both sides, and a flat plate portion 9.
0, and a corrugated portion 92 that increases friction with the sail 14 is formed on the upper surface of the flat plate portion 90. By thus interposing the friction member 88 at the portion where the sail 14 and the chain are in contact with each other, particularly when the sail 14 is wound on the drum 26, the entire sail is smoothly fed in the direction of the drum 26, and the winding operation is performed. Assure. That is, since only the lower end of the sail 14 is connected to the chain 74, only the lower end of the sail is positively sent out upward together with the chain 74 when the sail is wound up. Therefore, for example, if there is any catch in the middle of the sail. The sail 14 smoothly moves to the drum 26.
However, the friction member 88 allows the mid-portion of the sail 14 to be smoothly sent out in the drum direction to facilitate the winding operation. Further, the front and rear side edges of the sail 14 when the sail 14 is unrolled are reinforced by the friction member 88, and fluttering of the sail is suppressed.

In FIG. 8, reference numeral 94 is a slide rail for allowing the chain 74 to smoothly run on the curved portion of the column 12, and reference numeral 96 is a shaft end portion protruding at both ends of the bone column 50. It is a bearing provided. In this embodiment, a pair of guide plates 20 are connected from the outer surface of the prism 16 and the guide plates 20 are formed so as to be bent outward in an L shape. A guide passage for the bearing 96 is formed. Further, in this embodiment, the seal member 56 is arranged so as to extend from the side edge of the sail 14 and bend in a U-shape and be inserted into the groove formed by the other guide plate 20.

As shown in FIG. 9, the first sprocket 76 of the chain 74 is not directly fixed to the holding plate 22, but a frame 97 fixed to the holding plate 22 has a coil spring 98 interposed therebetween. Is rotatably supported by a support member 99 which is movably supported. This makes the chain 7
Loosening of 4 is prevented.

According to the second embodiment, when the second sprocket 78 is rotationally driven in the clockwise direction in FIG. 7 by the motor 80 from the fully opened state of the sail, the sail fixed to a part of the chain 74 is sailed. 14 is unwound against the biasing force of the spring 72 of the drum 26. At this time, the sail 14 is biased in the direction in which it is wound around the drum 26 by the biasing force of the spring 72, so that the sail 14 is always in a tensioned state. Therefore, the sail 14 is prevented from fluttering due to wind or the like. When the second sprocket 78 is rotated in the counterclockwise direction in FIG. 7 from the fully closed state of the sail, the lower end portion of the sail 14 is locked by the chain 7
4 and thus the spring 7 of the drum 26.
The sail 14 is wound up by the biasing force of 2. At this time, since the friction member 88 moves along with the chain 74 especially along the curved portion of the sail, an intermediate part of the sail 14 is smoothly sent out in the drum direction together with the chain 74, and the sail 14 is smoothly wound around the drum 26. Taken.

[0031]

As described above, according to the present invention,
Even when there is not enough space in the width direction of the carrier and in the upper direction, the cargo handling work can be performed by an extremely simple operation, and the labor and time of the cargo handling work can be significantly reduced. There is an excellent effect. Also,
Despite the use of the sail, the sail can always be closed under tension and can also provide sufficient strength as a protective wall.

Further, according to the present invention, since the support columns are substantially gate-shaped and the winding drum of the sail is arranged closer to the center than the left and right ends, it is possible to use the upper part of the carrier for the cargo handling work. Therefore, there is an effect that the cargo handling work can be further simplified.

[0033]

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire opening / closing device for a luggage carrier sail according to the present invention.

FIG. 2 is a cutaway perspective view showing a pillar and a lower end portion of a sail according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a structure of a column of the embodiment.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a partially cutaway side view showing the opening / closing device on the rear side of the second embodiment of the present invention.

7 is a cross-sectional view taken along the line VII-VII of FIG.

8 is an enlarged cross-sectional view taken along the line VIII-VIII of FIG.

9 is a view taken along the line IX of FIG.

FIG. 10 is an enlarged perspective view of the friction member of the embodiment.

[Explanation of symbols]

 10 Luggage 12 Strut 14 Sail 24 Motor 26 Drum 36 Pulley 38 Friction Plate 48 Wire

Claims (6)

[Claims] 1. A support which is erected on at least a front part and a rear part of a luggage carrier of a baggage carrier, each of which has a substantially gate shape in the width direction, and which is bridged between the supports to be elevated and lowered along the supports, and when descending. A sail that covers at least a side surface of the luggage carrier, and a rotating drum that spans between the stanchions at a position near the center in the width direction of the substantially gate-shaped upper side of the stanchion and winds and unwinds the sail are provided. When winding the sail,
Also, an opening / closing device for a luggage carrier sail, which is configured to open a surface of the top surface of the cargo bed near the end in the width direction. 2. An urging means for urging the rotating drum in the winding direction of the sail, and a driving means connected to the lower end of the sail for lowering the sail against the urging force of the urging means of the rotating drum. The sail opening / closing device for a baggage carrier according to claim 1, further comprising: a sail for unwinding the sail from the rotary drum so that the sail is always tensioned by the urging force of the urging means. 3. The urging means comprises a spring having one end connected to the rotary drum side and the other end connected to the support side, and the drive means moves up and down the support by switching between the motor and the drive of the motor. The opening / closing device for a luggage carrier sail according to claim 2, further comprising: a winding transmission mechanism connected to a lower end of the sail. 4. A sail which covers the cargo bed through the pillars, in which pillars are erected on at least a front portion and a rear portion of a luggage carrier carrier.
An opening / closing device for a luggage carrier sail, which is raised and lowered along the support pillar, comprising: a sail winding drum passed between a front support pillar and a rear support pillar; A pulley having a large outer diameter, one end wound on this pulley, the other end folded back at the lower part of the loading platform, and a wire connected to the lower part of the sail, and a drive mechanism for driving the drum in a forward and reverse direction. And provided between the drum and the pulley, when the tension of the wire that winds the pulley is less than or equal to a predetermined value, the pulley is rotated integrally with the drum, and the tension is greater than or equal to a predetermined value. An opening / closing device for a luggage carrier sail, comprising: a friction transmission mechanism that sometimes causes the pulley to slide on a drum. 5. The wire according to claim 4, which is folded back by a pulley disposed under the cargo bed, and the pulley is supported by the cargo bed so as to be vertically movable within a certain range and is constantly urged downward. Opening and closing device for the luggage carrier. 6. The luggage carrier according to claim 4, wherein each of the columns has a substantially gate shape, and the drum is disposed at an upper side portion of the substantially gate type column and closer to the center than the left and right ends thereof. Sail opening and closing device.