TWI831930B - Truck bed cover - Google Patents

Abstract

The invention is a truck body cover, which is used to be installed on a truck, and the truck has a truck body. The cover includes a transmission device, a linkage device and a cover. The transmission device and the linkage device are respectively arranged at both ends of the truck body, and the linkage device is linked by the transmission device. The transmission device includes a power source, a first chain, a second chain, and a driven device. group and a rotating shaft. The power source is used to drive the second chain to rotate, so that the driven group can move back and forth between the first chain and the second chain, and the rotating shaft is provided on the driven group and one side of the cover It is provided on the truck body and the other side is provided on the rotating shaft so that the rotating shaft can rotate to collect the cover and move back and forth, thereby achieving the effect that the cover can move stably.

Description

Truck bed cover

The present invention is applied in the technical field of large vehicles, and particularly refers to a truck body cover with better stability and service life.

It is generally known that a truck body cover device is used. For example, the applicant has previously approved the new patent No. M555805 "Truck body cover transmission device", which is used to be installed on a truck and includes a first chain, a first A positioning wheel set, a gear set and a power source. One end of the first chain is fixed to one end side edge of the truck, and the other end is fixed with an elastic element. One end of the elastic element away from the first chain is fixed to the other side edge of the same end of the truck. The first positioning wheel set has at least two first Positioning wheels, two first positioning wheels are respectively pivoted at the two top positions of the truck, and the two first positioning wheels are against both sides of the first chain to adjust the position of the first chain. The gear set is provided with at least one gear. And the gear is meshed with the first chain between the two first positioning wheels, and the gear is provided with a rotating shaft at the axis center, and the power source drives the gear to rotate, and one side of a cover is fixed on the rotating shaft to provide the power source When the gear is driven to rotate, it can move on the first chain and link the rotating shaft to move left and right to achieve the effect of opening or closing the cover.

Although the above-mentioned cover device of the truck body can effectively open or close the cover, since the power source is movable on the first chain, and the power source itself includes components such as motors and reduction gears, Therefore, the weight is heavy and easy to move when moving on the first chain. It is easy to cause wear between the gear and the first chain, and the elastic element is prone to elastic fatigue due to long-term stress, resulting in reduced service life. At the same time, due to the heavy weight of the power source, it is more likely to cause the third chain to be damaged when moving. The problem of insufficient stability caused by uneven force on a chain occurs and needs to be improved.

In view of the fact that the above-mentioned conventional truck body cover device still has shortcomings of poor service life and insufficient use stability in actual use, the inventor invented the present invention to improve it.

The main purpose of the present invention is to provide a cover for a truck body, which can achieve long service life and better stability in use through an integral structure.

In order to achieve the foregoing object of the invention, the technical means used in the present invention is to provide a truck body cover, which is arranged on a truck, and the truck has a truck body, and the cover includes a transmission. device, a linkage device, a cover and a limiting device. A transmission device, which is provided at one end of the truck body and includes a first positioning wheel set, a second positioning wheel set, a power source, a first chain set, a second chain set, and a slave moving group and a rotating shaft. The first positioning wheel set is fixed on a top side of the truck body, and the first positioning wheel set has a first fixing seat, and the first fixing seat is fixed on the truck body, and the first fixing seat The seat is respectively pivoted with a first positioning wheel, a second positioning wheel and a third positioning wheel; the second positioning wheel set is fixed on a top side of the truck body away from the first positioning wheel set, and the third positioning wheel set is The two positioning wheel sets have a second fixed base, which is fixed on the truck body. The second fixed base is pivoted with a fourth positioning wheel and a fifth positioning wheel respectively; the power source is fixed on the truck body. The truck body, and the power source has a motor, and the motor is connected to rotate a first sprocket; the first chain group is provided with a first chain and two first elastic elements, and the first chain passes through the first positioning The second positioning wheel of the wheel set is wound around the fifth positioning wheel of the second positioning wheel set, and both ends of the first chain are respectively fixed on one of the first elastic elements, and each of the first elastic elements One end of the component away from the first chain is fixed to the truck body respectively; the second chain set is provided with a second chain and a sixth positioning wheel, the sixth positioning wheel is provided on the truck body, and the second chain forms Closed, and sequentially wound around the first positioning wheel and the third positioning wheel of the first positioning wheel set, the fourth positioning wheel, the sixth positioning wheel of the second positioning wheel set and the power source; The driven group is disposed between the first positioning wheel set and the second positioning wheel set, and the driven group has a second sprocket wheel, a first driven wheel and a second driven wheel. The second sprocket wheel Located between the first driven wheel and the second driven wheel, the first chain is meshed between the second driven wheel and the second sprocket, and the second chain is meshed between the first driven wheel and the second sprocket. between the second sprockets; one end of the rotating shaft is fixed to the axis center of the second sprocket, and one side of the cover is fixed to the truck body, and the other side is fixed to the rotating shaft; the linkage device is provided on the truck The vehicle body is different from the other end of the transmission device, and the linkage device is passively linked by the transmission device.

In one embodiment of the present invention, the above-mentioned truck body cover, wherein the first positioning wheel, the second positioning wheel, the third positioning wheel, the fourth positioning wheel, the fifth positioning wheel, the The sixth positioning wheel is respectively pivoted on a limiter, the limiters form an inverted U-shape, and the first chain or the second chain is respectively installed on the corresponding closed end of the limiters.

In one embodiment of the present invention, the above-mentioned truck bed cover further includes a first power switch. The first power switch is disposed adjacent to the second fixed base for the cover to be in a closed state. At this time, the first power switch will sense that the rotating shaft moves to a position adjacent to the second fixed base to turn off the power.

In one embodiment of the present invention, the above-mentioned truck bed cover further includes A first power switch is a power pressure-sensitive switch, and the rotating shaft will indirectly press and control the first power pressure-sensitive switch to turn off the power.

In one embodiment of the present invention, in the above-mentioned truck body cover, the first chain set has a steel cable fixed between both ends of the first chain and the corresponding first elastic elements respectively.

In one embodiment of the present invention, the above-mentioned truck body cover further includes a tension adjustment mechanism, the tension adjustment mechanism is provided between the sixth positioning wheel and the power source, and the tension adjustment mechanism is used to Adjust the tension of the second chain. The tension adjustment mechanism includes a base, a positioning rod, a second elastic element, a seventh positioning wheel and a limiter. The base is fixed on the truck body, and The positioning rod penetrates the base, and the second elastic element is limited between one end of the positioning rod and the base. The positioning rod is fixed with the limiting piece at one end different from the second elastic element. Seven positioning wheels are pivoted on the limiting member with a U-shaped opening, and the second chain passes through the closed end of the limiting member and is pressed against the seventh positioning wheel.

In one embodiment of the present invention, the above-mentioned truck body cover further includes a limiting device, the limiting device is installed on one side of the truck body, and the limiting device is used to expand the cover. Position the shaft when hooding.

In one embodiment of the present invention, in the above-mentioned truck bed cover, the limiting device includes a swing member, a third elastic element, a rope, a drawstring, a handle and a fastener. The middle section is pivoted at the upper section of the truck body, and one end of the ornament protrudes from the truck body and is provided with a buckling portion. The buckling portion is provided toward the inside of the truck body, and the other end of the ornament is connected in sequence. The third elastic element and the rope are fixed to the truck bed at the other end away from the third elastic element and located below the ornament, and the end of the ornament towards the buckling part is fixed with the pull rope. One end, the other end of the pull rope is fixed on the handle, and one end of the handle is pivoted on the lower part of the truck body, so that the handle can pivot the swing member through the pull rope, so that the buckling part can be The rotating shaft moves to the cover unfolding position to buckle the rotating shaft, and the fastener is pivoted at the position of the truck bed below the handle, and the fastener can engage and position the handle.

In one embodiment of the present invention, in the above-mentioned truck bed cover, the limiting device further includes a second power switch. The second power switch is provided below the handle, and when the handle is pressed down, the When the buckling part fastens the rotating shaft, the handle can press against the second power switch to turn off the power of the power source.

In one embodiment of the present invention, the above-mentioned truck body cover, wherein the first positioning wheel, the second positioning wheel, the third positioning wheel, the fourth positioning wheel, the fifth positioning wheel, the The sixth positioning gear train can be a pulley.

10:Truck

11:Truck body

20: Transmission device

21:First positioning wheel set

210:First fixed seat

211:Limiting piece

212:First positioning wheel

213:Second positioning wheel

214:Third positioning wheel

22:Second positioning wheel set

220:Second fixed seat

221:Limiting parts

222:Fourth positioning wheel

223:Fifth positioning wheel

23:Slave group

230:Second sprocket

231:First driven wheel

232:Second driven wheel

24:First power switch

25:First chain group

250:First chain

251:Steel rope

252:First elastic element

26:Rotating axis

27:Power source

270:Motor

271:First sprocket

28:Second chain group

280:Second chain

281:Limiting piece

282:Sixth positioning wheel

29: Tension adjustment mechanism

290:Pedestal

291: Positioning rod

292: Second elastic element

293:Seventh positioning wheel

294:Limiting parts

30: Linkage device

40:Limiting device

41: Ornaments

410:Withholding Department

42: Second elastic element

43:rope

44: Pull rope

45: handle

46:Fasteners

47: Second power switch

50: sprocket

60: Hand crank 60

Figure 1 is a three-dimensional appearance view of the present invention applied to a truck.

Figure 2 is a schematic front perspective view of the transmission device of the present invention.

Figure 3 is a schematic rear perspective view of the transmission device of the present invention.

Figure 4 is a schematic plan view of the transmission device of the present invention.

Figure 5 is a schematic three-dimensional view of the limiting device of the present invention.

Figure 6 is a schematic plan view of the limiting device of the present invention.

Figure 7 is a schematic diagram of a front view of a three-dimensional embodiment of the transmission device of the present invention with electric and manual power sources.

As shown in Figures 1 to 4, the truck body cover of the present invention is used to be installed on a truck 10, and the truck 10 has a truck body 11, which includes a transmission device 20, a linkage device 30, a cover (not shown in the figure) and a limiting device 40. The transmission device 20 and the linkage device 30 are respectively provided at both ends of the truck body 11 , and the limiting device 40 is provided on one side of the truck body 11 .

The transmission device 20 has a first positioning wheel set 21, a second positioning wheel set 22, a driven set 23, a first power switch 24, a first chain set 25, a rotating shaft 26, a power source 27, a second chain group 28 and a tension adjustment mechanism 29.

The first positioning wheel set 21 is fixed on a top side of the truck body 11 , and the first positioning wheel set 21 has a first fixing base 210 , and the first fixing base 210 is fixed on the truck body 11 , and the first fixed base 210 is respectively fixed with three inverted U-shaped limiting members 211, and the limiting members 211 are respectively equipped with a first positioning wheel 212, a second positioning wheel 213 and a third positioning wheel. Positioning wheel 214.

The second positioning wheel set 22 is fixed on a top side of the truck body 11 away from the first positioning wheel set 21 , and the second positioning wheel set 22 has a second fixing base 220 , and the second fixing base 220 Fixed on the truck body 11, the second fixed seat 220 is respectively fixed with two inverted U-shaped limiting parts 221. The limiting parts 221 are respectively pivoted with a fourth positioning wheel 222 and a fifth Positioning wheel 223, and the openings of the three limiting members 211 of the first fixed base 210 and the two limiting members 221 of the second fixed base 220 are arranged in opposite directions.

The first power switch 24 is disposed adjacent to the second fixed base 220, so that when the cover is in the folded state, the first power switch 24 will sense that the rotating shaft 26 moves to the second fixed base 220 position. To turn off the power, as shown in the figure, the first power switch 24 is a power pressure-sensitive switch, and the rotating shaft 26 will indirectly control the first power switch 24 by pressing to turn off the power.

As shown in Figures 1 to 4, the power source 27 is fixed on the truck body 11. If it is started by electricity, the power source 27 has a motor 270, and the motor 270 is capable of linking a first A sprocket 271 rotates.

For example, as shown in Figure 7, if the power source 27 is equipped with both electric start and manual retraction methods, a sprocket 50 (tooth plate) can be provided on one side of the power source 27, and the sprocket 50 can be connected to the second chain. The assembly of a second chain 280 of the group 28, and a pluggable hand crank 60 connected to the sprocket 50 (tooth plate), as mentioned above, when the hand crank 60 is rotated by manpower, the sprocket 50 (Toothed disc) can drive the second chain 280 to rotate, further rotating the rotating shaft 26 on the mask.

The first chain set 25 is provided with a first chain 250, two steel cables 251 and two first elastic elements 252. The first chain 250 is wound to the first positioning wheel 213 through the second positioning wheel 213 of the first positioning wheel set 21. The fifth positioning wheel 223 of the two positioning wheel sets 22, and the two ends of the first chain 250 are respectively fixed on one of the steel cable 251 and the first elastic element 252, and two ends of each first elastic element 252 The ends are respectively fixed to the corresponding steel cable 251 and the truck body 11 .

The second chain group 28 is provided with a second chain 280, an inverted U-shaped limiting member 281 and a sixth positioning wheel 282. The limiting member 281 is fixed on the truck body 11, and the sixth positioning wheel 282 is fixed on the truck body 11. The wheel 282 is pivoted on the limiting member 281, and the second chain 280 is formed into a closed shape, and is sequentially wound around the first positioning wheel 212, the third positioning wheel 214, and the second positioning wheel 214 of the first positioning wheel group 21. The fourth positioning wheel 222 , the sixth positioning wheel 282 and the power source 27 of the positioning wheel set 22 .

The driven group 23 is disposed between the first positioning wheel group 21 and the second positioning wheel group 22, and the driven group 23 has a second sprocket 230, a first driven wheel 231 and a second driven wheel. 232, the second sprocket 230 is located between the first driven wheel 231 and the second driven wheel 232, and the first chain 250 is meshed between the second driven wheel 232 and the second sprocket 230, and The second chain 280 is engaged between the first driven wheel 231 and the second sprocket 230 .

One end of the rotating shaft 26 is fixed to the axis center of the second sprocket 230 , one side of the cover is fixed to the truck body 11 , and the other side is fixed to the rotating shaft 26 .

The tension adjustment mechanism 29 is disposed between the sixth positioning wheel 282 and the power source 27, and is used to adjust the tension of the second chain 280. The tension adjustment mechanism 29 includes a base 290, a The positioning rod 291, a second elastic element 292, a seventh positioning wheel 293 and a limiting member 294, the base 290 is fixed on the truck body 11, and the positioning rod 291 penetrates the base 290, and the The second elastic element 292 is limited between one end of the positioning rod 291 and the base 290 . The positioning rod 291 is fixed with the limiting member 294 at one end different from the second elastic element 292 . The seventh positioning wheel 293 The second chain 280 is pivoted on the U-shaped limiting member 294 , and the second chain 280 is passed through the closed end of the limiting member 294 and is pressed against the seventh positioning wheel 293 .

The structure of the linkage device 30 is roughly the same as that of the transmission device 20, and is disposed on the other end of the truck body 11 from the transmission device 20. The linkage device 30 is not provided with the power source 27 and is passively affected by the power source 27. The transmission device 20 is connected, so no details are given here.

The limiting device 40 is installed on one side of the truck body 11. Please also refer to Figure 5. The limiting device 40 is used to position the rotating shaft 26 when the cover is unfolded, and the limiting device 40 includes A swing piece 41 , a third elastic element 42 , a rope 43 , a drawstring 44 , a handle 45 , a fastener 46 , and a second power switch 47 . The middle section of the swing piece 41 is pivotally mounted on the upper section of the truck body 11 , and one end of the swing piece 41 protrudes from the truck body 11 and is provided with a buckling portion 410 , and the buckling portion 410 is disposed toward the interior of the truck body 11 , and the other end of the ornament 41 is connected to the third elastic element 42 and the rope 43 in sequence, and the rope 43 is fixed at the other end away from the third elastic element 42 The truck bed 11 is located below the rocker 41, and one end of the rocker 44 is fixed to one end of the rocker 41 toward the buckling portion 410. The other end of the rope 44 is fixed to the handle 45. The handle 45 One end is pivoted at the lower portion of the truck body 11 so that the handle 45 can pivot the swing member 41 through the drawstring 44 so that the buckling portion 410 can move to the cover deployment position on the rotating shaft 26. To buckle the rotating shaft 26, and the fastener 46 is pivoted at the position of the truck body below the handle, and the fastener 46 can fasten and position the handle 45, and the second power switch 47 is provided below the handle 45, When the handle 45 is pressed down to cause the buckling portion 410 to engage the rotating shaft 26 , the handle 45 can be pressed against the second power switch 47 to turn off the power of the power source 27 .

The first positioning wheel 212, the second positioning wheel 213, the third positioning wheel 214, the fourth positioning wheel 222, the fifth positioning wheel 223, and the sixth positioning wheel 282 can be a pulley.

When the cover needs to be closed on the truck bed 11, as shown in Figures 1 to 4, the power source 27 drives the first sprocket 271 to rotate, which in turn drives the second chain 280 to rotate. The second sprocket 230 rotates in conjunction with the rotating shaft 26 , and the second sprocket 230 is engaged by the first chain 250 and rotates with the first chain 250 , that is, the second sprocket 230 is engaged by the second chain 280 Driven and rotated on the first chain 250, the second chain 280 and the second sprocket 230 can be driven in sequence according to the direction of rotation of the first sprocket 271, and finally the rotating shaft 26 can be rolled up to the shield. The cover moves toward one side of the limiting device 40 as shown in the figure, and because the first driven wheel 231 and the second driven wheel 232 correspondingly cooperate with the second sprocket 230, the driven group 23 can be stably driven by the second chain 280, resulting in good movement stability of the rotating shaft 26, and because the first chain group 25 has two first elastic elements 252, it can move on the truck when the rotating shaft 26 When the bucket 11 is placed, the first chain 250 can be provided with appropriate elastic displacement along the curvature of the end surface of the truck bucket 11, and And the first chain 250 or the second chain 280 can be respectively inserted into the closed ends of the limiting members 211, 221, 281, 294, and can be connected to the first positioning wheel 212 and the first positioning wheel respectively. The wheel 212, the second positioning wheel, the third positioning wheel, the fourth positioning wheel, the fifth positioning wheel, the sixth positioning wheel or the seventh positioning wheel fit together to increase the stability of the structure and effectively avoid The first chain 250 or the second chain 280 is composed of the first positioning wheel 212, the first positioning wheel 212, the second positioning wheel 213, the third positioning wheel 214, the fourth positioning wheel 222, the The fifth positioning wheel 223, the sixth positioning wheel 282 or the seventh positioning wheel 293 comes out.

When the cover of the truck body 11 is complete, the power source 27 is stopped, and as shown in Figures 5 and 6, the handle 45 is pulled to make the truck body 11 pivot differently. When one end is pulled downward and the handle 45 is pivoted, the pull rope 44 will be synchronously moved downward, driving one end of the swing member 41 to pivot around the pivot point, causing the buckling portion 410 to move toward the rotating shaft 26 , and when the handle 45 is pulled down to the set position, the buckling portion 410 will press against the rotating shaft 26 , and the other end of the swing piece 41 will stretch the third elastic element 42 , and at the same time, the handle 45 will press against to the second power switch 47, and pivot the fastener 46 to engage the handle 45 to position the handle 45, and the handle 45 will press against the second power switch 47 to turn off the second power switch 47. The motor 270 of the power source 27 prevents the buckling portion 410 from pressing against the rotating shaft 26 to form a safety device to prevent the operator from accidentally touching the start switch of the power source 27 in this state, thereby causing the transmission device 20 to Damage and safety issues.

In addition, when the cover is rolled up, as shown in Figures 1 to 4, it is the same as the action of the cover covering the truck body 11, that is, the fastener 46 of the limiting device 40 is first removed. When the handle 45 is disengaged and affected by the elastic force of the third elastic element 42 , the handle 45 will sequentially drive the swing member 41 , the buckling portion 410 , the drawstring 44 and the handle 45 to return to their original state, causing the buckling portion 410 to return to its original state. At the same time, the handle 45 is separated from the second power switch 47 and the handle 45 is separated from the second power switch 47. At this time, the operator can activate the power source of the power source 27 via remote control or manually, so that the motor 270 of the power source 27 drives the first sprocket 271. Reverse rotation to drive the driven group 23 to move in the direction of the first power switch 24, and at the same time drive the rotating shaft 26 to rotate, retract and move the mask, and when the mask is retracted to its original position, the driven group The group 23 will press against the first power switch 24 to turn off the power of the motor 270 of the power source 27, allowing the driven group 23 and the rotating shaft 26 to move to the set position, thereby completing the operation of retracting the mask.

The present invention has been described through the above-mentioned embodiments and variations. All embodiments and variations of the present invention are only illustrative. Based on the essential spirit and scope of the present invention, the cover device of the truck bed including the above features Various variations are contemplated by this invention.

10:Truck

11:Truck body

20: Transmission device

21:First positioning wheel set

22:Second positioning wheel set

23:Slave group

25:First chain group

26:Rotating axis

27:Power source

28:Second chain group

29: Tension adjustment mechanism

30: Linkage device

40:Limiting device

Claims (11)

A truck body cover is used to be installed on a truck, and the truck has a truck body. The cover includes: A transmission device, which is provided at one end of the truck body and includes: A first positioning wheel set, the first positioning wheel set is fixed on a top side of the truck body, and the first positioning wheel set has a first fixed seat, the first fixed seat is fixed on the truck body bucket, and the first fixed seat is respectively pivotally provided with a first positioning wheel, a second positioning wheel and a third positioning wheel; A second positioning wheel set, the second positioning wheel set is fixed on a top side of the truck body away from the first positioning wheel set, and the second positioning wheel set has a second fixed base, the second fixed The base is fixed on the truck body, and the second fixed base is respectively provided with a fourth positioning wheel and a fifth positioning wheel; A power source, the power source is fixed on the truck body, and the power source has a motor, the motor is connected to rotate a first sprocket; A first chain group, the first chain group is provided with a first chain and two first elastic elements, the first chain is wound to the second positioning wheel group through the second positioning wheel of the first positioning wheel group The fifth positioning wheel, and the two ends of the first chain are respectively fixed on one of the first elastic elements, and the end of each first elastic element away from the first chain is fixed on the truck body; A second chain group, the second chain group is provided with a second chain and a sixth positioning wheel. The sixth positioning wheel is provided on the truck body, and the second chain is formed into a closed shape and is wound around the truck body in sequence. The first positioning wheel and the third positioning wheel of the first positioning wheel group, the fourth positioning wheel, the sixth positioning wheel of the second positioning wheel group and the power source; a driven group, the driven group It is provided between the first positioning wheel set and the second positioning wheel set, and the driven set has a second sprocket wheel, a first driven wheel and a second driven wheel, and the second sprocket wheel is located on the first between the driven wheel and the second driven wheel, and the first chain is meshed between the second driven wheel and the second sprocket, and the second chain is meshed between the first driven wheel and the second sprocket between; a rotating shaft, one end of the rotating shaft is fixed to the axis center of the second sprocket, and one side of the cover is fixed to the truck body, and the other side is fixed to the rotating shaft; a linkage device, the linkage device is provided The truck body is at the other end of the transmission device, and the linkage device is passively linked by the transmission device. The truck body cover according to claim 1, wherein the first positioning wheel, the second positioning wheel, the third positioning wheel, the fourth positioning wheel, the fifth positioning wheel, the sixth positioning wheel The wheels are respectively pivoted on a limiter, the limiters form an inverted U-shape, and the first chain or the second chain is respectively installed on the corresponding closed end of the limiters. The truck body cover as claimed in claim 1 further includes a first power switch, which is disposed adjacent to the second fixing base so that when the cover is in a folded state, the first power switch is disposed adjacent to the second fixed base. The first power switch will sense that the rotating shaft moves to a position adjacent to the second fixed base to turn off the power. The truck body cover described in claim 3 further includes a first power switch that is a power pressure-sensitive switch, and the rotating shaft will directly press and control the first power pressure-sensitive switch to turn off the power. The truck body cover as claimed in claim 1, wherein the first chain set has a steel cable fixed between both ends of the first chain and the corresponding first elastic element. The truck body cover according to claim 1 further includes a tension adjustment mechanism, the tension adjustment mechanism is disposed between the sixth positioning wheel and the power source, and the tension adjustment mechanism is used to adjust the third The tension of the two chains. The tension adjustment mechanism includes a base, a positioning rod, a second elastic element, a seventh positioning wheel and a limiter. The base is fixed on the truck body, and the positioning rod Penetrating the base, and the second elastic element is limited between one end of the positioning rod and the base, the positioning rod is fixed with the limiter at one end different from the second elastic element, and the seventh positioning wheel The second chain is pivoted on the limiting member with a U-shaped opening, and the second chain is passed through the closed end of the limiting member and pressed against the seventh positioning wheel. The cover of the truck body as described in claim 1 further includes a limiting device installed on one side of the truck body, and the limiting device is used to position the cover when unfolding it. The axis. The truck body cover as claimed in claim 7, wherein the limiting device includes a swing member, a third elastic element, a rope, a drawstring, a handle and a fastener, and the swing member is pivoted in the middle At the upper position of the truck body, one end of the ornament protrudes from the truck body and is provided with a buckling portion. The buckling portion is provided toward the inside of the truck body, and the other end of the ornament is connected to the third party in sequence. The elastic element and the rope are fixed to the truck bed at the other end away from the third elastic element and located below the ornament, and one end of the pull rope is fixed to one end of the ornament towards the buckling part, and the The other end of the pull rope is fixed on the handle, and one end of the handle is pivoted on the lower part of the truck body so that the handle can pivot the swing member through the pull cord so that the buckling part can move on the rotation axis. to the unfolded position of the cover to buckle the rotating shaft, and the fastener is pivoted at the position of the truck body below the handle, and the fastener can fasten and position the handle. As claimed in claim 8, the cover of the truck bed, wherein the limiting device further includes a second power switch, the second power switch is provided below the handle, and when the handle is pressed down, the buckling portion is buckled. When the rotating shaft is closed, the handle can press against the second power switch to turn off the power of the power source. The truck body cover as claimed in claim 1, wherein the first positioning wheel, the second positioning wheel, the third positioning wheel, the fourth positioning wheel, the fifth positioning wheel and the sixth positioning wheel The gear train can be a pulley. The truck body cover as described in claim 1, wherein the power source is equipped with both electric start and manual retraction methods, and a sprocket (tooth plate) is provided on one side of the power source. The wheel can be assembled with a second chain of the second chain group, and a hand crank is releasably assembled with the sprocket (tooth plate).

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