WO2017065704A1

WO2017065704A1 - Labor-saving truck tailgate device set

Info

Publication number: WO2017065704A1
Application number: PCT/TH2016/000084
Authority: WO
Inventors: Chidchanok HONGLAWAN
Original assignee: Honglawan Chidchanok
Priority date: 2015-10-14
Filing date: 2016-10-17
Publication date: 2017-04-20
Also published as: PH12018500681A1; EP3362337A4; EP3362337A1; CN208085832U

Abstract

A labor-saving truck tailgate device set comprises a tailgate bracket (42, 44), a spindle-containing spring set (555), a spring-end supporting bracket (80) and further comprises a damper set (444) and a damper bracket (40, 41). The spindle-containing spring set (555) is connected to the tailgate bracket (42, 44) by inserting the coiled spring (15) into the spindle (74) so that one end of the coiled spring (15) is held onto the tailgate bracket (40, 41) and the other end of the coiled spring (15) is connected to the spring-end supporting bracket (80) by means of having said spring-end supporting bracket (80) held onto the truck body (121). The spindle (74) is positioned on the same center as the spindle (46) of the tailgate (111) and is further comprising the damper set (444) which is connected to the truck body (121) and the tailgate (111) via bracket (40,41). The end of the spring (15) that is connected to the tailgate bracket (42, 44) rotates in the same direction as the tailgate (111) during opening. The end of spring (15) that supported on the spring-end supporting bracket (80) creates the strain via the rotational force of the coiled spring (15) and the retardation of the damper (444) in order to reduce the shock during opening the tailgate (111) and, at the same time, the accumulating strain or tension inside the spring (15) gets converted into the recoil force during closing of the tailgate (111).

Description

TITLE OF THE INVENTION

LABOR-SAVING TRUCK TAILGATE DEVICE SET

FIELD OF THE INVENTION

The field of engineering in relations to a labor-saving truck tailgate device set. BACKGROUND OF THE INVENTION

A truck or a pick-up truck with the size of at least 1 ton is characterized by a tailgate connectable to the truck body and a locking device to lock said tailgate to the body. Figure 1 illustrates one embodiment of the truck tailgate during closing wherein the tailgate ( 1 1 1) is connected to the truck body (121). Figure 2 illustrates one embodiment of the tailgate during opening wherein the internal view shows the tailgate (1 11) during opening from the truck body (121) and the tailgate (11 1) is connected to a truck body (121) with rotational points 12, 3) dictating by sling or hinge (4, 5) on both sides of the tailgate ( l i b. At one end of each sling or hinge (4, 5) is connectable to the truck body ( 121) and the other end of said sling or hinge (4, 5) is connectable to the tailgate (1 11). The sling or hinge (4, 5) may have different characteristics depending on the truck or car models, but shall support the tailgate to swing open up to 90° angle.

During operation, the tailgate ( 1 1 1) may be dropped abruptly if the user let the^" tailgate drop freely. This can be dangerous for users who are within the dropping radius. At the same time, the act of closing the tailgate ( 111) and locking to the truck body (121) may require large amount of physical force to lift the heavy tailgate (111) up.

Further, there have been attempts to create mechanics and methods for labor-saving of the truck tailgates during opening using various materials such as torsion bar and gas spring wherein the material used is dependent upon the type of truck and inventing technique used by the related inventor. Another attempt to labor-save at opening and closing is by using the electric motor wherein said invention further requires a motor which wastes more energy and is costly to maintain. When referring to Thai patent application 150100231 1 under the title: -labor-saving tailgate hinge", Thai patent application 1501003836 under the title - labor- saving truck tailgate device" and Thai patent application 1501006449 under the title -labor- saving truck tailgate device set' which related to labor-saving truck tailgate hinge that utilizes a coiled spring to create a strain or tension via the rotational force of the coiled spring to reduce the shock during opening of the tailgate and, at the same time, the accumulating strain or tension inside the spring gets converted into the recoil force during closing of the tailgate. This invention utilizes for a truck or a pick-up track that the tailgate is connected to the truck body using the rotational points on hinge at the middle of the tailgate, thereby this invention is not appropriated for the truck or the pick-up truck wherein the tailgate is connected to truck body by the rotational point on both sides of the tailgate.

Therefore, labor-saving tailgate device set according to this invention can solve the issue as stated above by improvement in labor-saving of truck tailgate of the truck or the pickup truck wherein the tailgate is connected to truck body with the rotational point on both sides of the tailgate during its opening and closing, thereby its can reduce the shock during its opening the tailgate and labor-saving the tailgate lifting and closing tasks.

SUMMARY OF THE INVENTION

A labor-saving truck tailgate device set according to this invention comprises a tailgate bracket, a spindle-containing spring set. a spring-end supporting bracket wherein the invention further comprising a damper set with a damper bracket by having a tailgate bracket is connecting to the tailgate, the spindle- containing spring set is connected to the said tailgate bracket. The spindle acts as a core of the coiled spring wherein the coiled spring is inserted into the spindle. One end of the coiled spring is connected to the tailgate bracket whereas the other end of the coiled spring is connected or held on to the spring- end supporting bracket. Said spring-end supporting bracket is held on the truck body to support one end of said coiled spring.

The spindle is located on the same center of the spindle of the tailgate to labor- save during opening or closing of the tailgate. Moreover, this invention comprises a damper set which is connected to the truck body and the tailgate by a damper bracket to improve labor-saving during opening or closing the tailgate.

The objectives of this invention are to create said labor-saving truck tailgate device set by taking the advantage of the strain that has been created by the rotation of the coiled spring and the retardation of the damper to reduce the shock from the tailgates weight during opening and the accumulated strain by twisting of the coiled spring that can labor save during closing of the tailgate , and to create this device suitably for the truck or the pick-up truck wherein the tailgate is connected to truck body by the rotational point on both sides of the tailgate. This tailgate anchoring aspect containing a gap between the tailgate and the bottom edge of truck body for anchoring said labor-saving truck tailgate device set.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 illustrates one embodiment of the truck tailgate during closing:

Figure 2 illustrates one embodiment of the truck tailgate during opening;

Figure 3 illustrates one embodiment of the spindle connecting tailgate bracket of the tailgate; Figure 4 illustrates one embodiment of the spindle connecting tailgate bracket of the labor- saving truck tailgate device set according to this invention;

Figure 5 illustrates one embodiment of the spindle-containing spring set; Figure 6 illustrates details of the offset bushing;

Figure 7 illustrates one method of connecting the spindle into the ball-bearing and offset bushing;

Figure 8 illustrates one embodiment of the spindle when connecting the ball-bearing and offset bushing;

Figure 9 illustrates one embodiment of the spindle-driven flange; Figure 10 illustrates one embodiment of the spring-end supporting bracket; Figure 1 1 illustrates one embodiment of the damper with damper bracket; Figure 12 illustrates one method of connecting the tailgate bracket of the labor-saving truck tailgate device set according to this invention;

Figure 13 illustrates one method of connecting the spindle-containing spring set into the tailgate bracket; Figure 14 illustrates one method of connecting the spindle-driven flange;

Figure 15 illustrates one method of connecting the spindle-containing spring set into the spindle of the truck tailgate;

Figure 16 illustrates one method of tightening with nut from the inside;

Figure 17 illustrates one method of tightening with nut from the outside; Figure 18 illustrates one method of the labor-saving truck tailgate device set according to this invention when connecting to the tailgate;

Figure 19 illustrates one method of assembling the spring-end supporting bracket into truck body;

Figure 20 illustrates one method of assembling the damper into the truck body; Figure 21 illustrates one method of assembling the damper into the tailgate;

Figure 22 illustrates one embodiment of the labor-saving truck tailgate device set according to this invention during operation;

DETAILED DESCRIPTION OF THE INVENTION

The labor- saving truck tailgate device set according to this invention takes the advantage of the strain that has been created by the rotation of the coiled spring supporting with the retardation of the damper to reduce the shock from the tailgate s weight during opening and the accumulated strain by twisting of the coiled spring that can labor- save during .closing of a truck or pick-up truck tailgate ( 111) wherein comprises 3 main components, a tailgate bracket (42, 44), a spindle-containing spring set (555), and a spring-end supporting bracket (80). The tailgate bracket (42, 44) is used for connecting to tailgate and spindle-containing spring set (555) cause the coiled spring (15) to act as a labor-saver. The spring-end supporting bracket (80) acts as supporting part of one end of the coiled spring to protect the friction of the end of spring with the truck body wherein the labor- saving truck tailgate device set according to this invention further comprises a damper set (444) and a damper bracket (40, 41) that can reduce the shock of the tailgate (111) during opening. The tailgate bracket (42, 44) used for connecting to spindle- containing spring set (555) comprises a spindle (46) connecting the tailgate bracket (44) of the tailgate. The tailgate bracket is connected to tailgate (11 1) whereas the spindle (74) is connected to the tailgate bracket (42) of said labor-saving truck tailgate device set according to this invention.

The spindle-containing spring set (555) wherein the coiled spring ( 1 5) is inserted into the spindle (74) of the spindle-containing spring set (555). One end of spindle-containing spring set (555) is connected to the spindle (46) of the tailgate via a bolt stringing hole (9) of the tailgate bracket (42) that is connected to the spindle (74) of the said labor-saving truck tailgate device set according to this invention via the spindle stringing hole of spring ( 11) whereas the other end of the coiled spring ( 15) is connected to the spindle (74). One end of coiled spring (78) is assembled to a spring- end holding axle ( 12) of the tailgate bracket (42) that is connected to the spindle (74) of the said labor-saving truck tailgate device set while the other end of the coiled spring (79) is assembled to the spring-end supporting bracket (80).

The spring- end supporting bracket comprises one part for connecting to the truck body ( 121) that is provided with a hole (39) for connecting said spring- end supporting bracket to the truck body ( 121) and wherein another part acts to support the end of coiled spring providing with a raised edge (38) to connect to the other end of the coiled spring (79).

The labor-saving truck tailgate device set according to this invention is suitable for the truck or pick-up truck by means of having tailgate holding units on both sides on the bottom of the tailgate that contains a gap between the tailgate ( 1 11) and the truck body ( 121). Thus, the labor-saving truck tailgate device set shall be installed between this gap. To reduce the size of said device set according to this invention, the tailgate requires at least one set of device, but preferably two sets of such device of said labor-saving truck tailgate device set during operation. Moreover, said device set according to this invention is provided with the tailgate bracket (42,

44), the spindle-containing spring set (555), the spring-end supporting bracket (80) that comprises two components of each part at the position of the rotational point for opening and closing the tailgate ( 11 1) comprising one component at both the right and left side wherein the invention further comprises the damper set (444) and the damper bracket (40, 41).

Figures 3 illustrates the one embodiment of the spindle connecting tailgate bracket of the tailgate which is created from the formed metal sheet wherein said formed metal sheet comprises at least 3 components:

The first component for contacting the bottom of the tailgate (111) to connect or anchor said tailgate bracket to the tailgate ( 111) via the original hole of the tailgate ( 11) to avoid peribrating the tailgate ( 111) wherein said first component is provided with at least one bolt anchoring hole (6) as similar as a bolt anchoring hole ( 10) of the spindle connecting tailgate bracket (74) for holding the bolt at the bottom of the tailgate (111). To avoid perforating the tailgate (111), said labor-saving track tailgate device set can be connected to the tailgate that is provided with the bolt anchoring holes (6, 10) at the original hole of the truck. Thus, said device set according to this invention can use the same bolt of the track to anchor the tailgate bracket

(44).

The second component for contacting the side of the tailgate ( 1 1 1 ) for connecting said bracket to the tailgate (11) at the side of the tailgate using the same hole of the tailgate to avoid perforating the tailgate ( 111) by providing at least one bolt anchoring hole for connecting the bolt to the side of the tailgate, preferably by providing two bolt anchoring holes CI, 8).

The third component for contacting the spindle (46) o the tailgate for connecting said spindle (46) of the tailgate to the spindle- containing spring set (555) wherein the component providing at least one bolt stringing hole (9) for stringing the bolt head (52), which is the bolt head of the rotational point of the tailgate via the offset bushing (13) which is the spindle of the tailgate (111).

In consideration of the embodiment of the tailgate bracket (44) from the horizontal plane, the formed metal sheet in the second component that connects said bracket to the side of tailgate, is provided the same aspect as the spindle of the third component to connect the spindle of the tailgate with the spindle- containing spring set ( 555) . While, the first component is provided so that said bracket is connected to the bottom of the tailgate (1 11) by separating from the spindle of the second and the third components as illustrated in the figure 3.

Figure 4 illustrates one embodiment of the spindle connecting tailgate bracket of the labor saving truck tailgate device set according to this invention wherein the tailgate anchoring bracket (42) is provided for connecting to the spindle-containing spring set (555) in order to act as a labor saver and which is created from a formed metal sheet wherein said formed metal sheet comprises at least 3 components:

The first component for the bottom of the tailgate ( 11 1) to connect said bracket to the bottom of the tailgate ( 11 1) which uses the same and original hole of the tailgate to avoid perforating the tailgate ( 1 11) wherein the first component is provided with the bolt anchoring hole (10) of at least one hole for connecting the bolt at the bottom of the tailgate (111) which is at the same position as the bolt anchoring hole (6) of the tailgate bracket (44) wherein said spindle

( 46) connecting tailgate bracket of the tailgate. The spindle is the tailgate bracket (44) holding unit. The labor-saving truck tailgate device set according to this invention is provided so that the tailgate bracket utilizes the original hole of the truck or pick-up truck. To avoid perforating tailgate ( 1 11), said labor-saving truck tailgate device set can be connected to the tailgate using the bolt anchoring holes (6, 1 0) at the same hole of the truck. Thus, said device set according to this invention can use the same bolt of the truck to hold the tailgate bracket (42) or the truck bracket.

The second component for the spindle (74) of the spindle-containing spring set (555) for stringing the spindle (74) of the spindle- containing spring set (555) wherein the component is provided with at least one the spindle stringing hole of spring ( 11), preferably by having said spindle stringing hole of spring ( 1 1 ) at the same center of the rotational point as the spindle (46) of the truck tailgate and wherein said center is the same center as the bolt stringing hole (9) of the tailgate bracket (44) that is connected to the spindle (46) of the truck tailgate. In other embodiment, the stringing hole contains the opening gap between the edge of the stringing hole and the edge .of the second component. The opening gap is not a closed loop in order to take advantage from this opening gap for stringing the spindle (74) that is not limited to inserting into the stringing holes of any spindle.

The third component for the coiled spring (15)of the spindle-containing spring set (555) for inserting one end of the coiled spring (78) of the spindle-containing spring set (555) wherein the one embodiment is provided with a coiled spring end holding unit that has a channel to support the end of spring which is the spring- end holding axle ( 12). The one embodiment is chosen from a tube, or a channel that has inside cavity to hold, preferably using the size for inserting one end of the coiled spring (78). The third embodiment may be dented for any purposes.

Each part of the formed metal sheet is making angles to each other on a different plane as shown in figure 4.

Figure 5 illustrates the spindle- containing spring set wherein the spindle- containing spring set (555) comprises an offset bushing < 13 ), a ball bearing (14), the coiled spring (15), a nut (50) for tightening from the inside, a spindle-driven flange (17), a spindle (74), a washer (19), a nut ( 60) for tightening from outside wherein the coiled spring ( 15) contains on the one end of the coiled spring (78) for holding to the spring-end holding axle (12). The end of coiled spring is inserted into the spring-end holding axle (12) of the tailgate bracket (42) that is connected to the spindle (74) of the labor-saving truck tailgate device set according to this invention. The other end of the coiled spring (79) acts as the supporter of spring-end supporting bracket (80) and the coiled spring (15), and then is inserted into the spindle (74). Said spindle (74) is inserted into the center of the coiled spring ( 15) and the ball bearing ( 14), then it is connected to one end of the spindle (76) and one end of the offset bushing ( 13 ) to wear to the ball bearing ( 14), while the other end of the offset bushing ( 13) for wearing the bolt head (52) that is the bolt head of the rotational point of the tailgate. The other end o the spindle is connected to the tailgate bracket (42) via the spindle stringing hole of spring < 1 1 > of the tailgate bracket (42) and engaged to the nut ( 50) for tightening with nut from inside, the spindle- driven flange ( 17). washer (19), the nut (60) for tightening with nut from outside. Figure 6 illustrates the cross sectional detail of the offset bushing ( 13) that is created from lathe formed steel axle wherein:

One end of the offset bushing is lathed down into a groove for covering and conrfecting to the diameter of the ball wherein the depth suitably fits the thickness of ball bearing for covering and connecting to the ball bearing.

The other end of the offset bushing for inserting or covering with a bolt head which is the bolt head of rotational point of the tailgate whereby is lathed down into a groove for covering and connecting to the thickness of the bolt head that makes this end of the offset bushing can cover the bolt head and support to the washer.

Figure 7 illustrates one method of connecting the spindle into the ball-bearing and offset bushing wherein one embodiment of the spindle (74) can be chosen from a rod shape or spiral shape using the lathed formed steel, preferably the spiral shape characterizing by

One end of the spindle (76) will be lathed to create a suitable size for insertion and for connecting and holding the diameter of the ball bearing ( 4). Said one end of the spindle (76) can been chosen from a smooth surface without spirals or having a set spirals that are of the same length or more than the height of the coiled spring ( 15). The ball bearing ( 14» is covered by the offset bushing (13). Said coiled spring 1 15) and said ball bearing (14) are also connected to one end of the spindle (76) to entirely cover all parts as shown in figure 8.

The other end of the spindle (75) comprising the spirals for tightening with nut. Both ends of the spindle will be smoothened for the purposes of using the wrench for holding during tightening. The number o the spirals must be sufficient for tightening with nut to hold the spindle- containing spring set (555) to the tailgate bracket (42) that is connected to the spindle

( 74) of said labor-saving truck tailgate device set. The length of the spindle (74) depends on distance between the bolt head (52) that is the bolt head of the rotational point of the tailgate and the edge o bracket that is the spindle (46) connecting tailgate bracket (44) of the tailgate. the washer ( 19). The distance of smooth cut for anchoring the wrench at the end of the spindle that is the other end of the spindle (75). Figure 8 illustrates one embodiment of the spindle when fully comprising the ball bearing and the offset bushing wherein the one end of the spindle ( 76) is fitted into the ball bearing < 14) and then the ball bearing is connected to the offset bushing. The other end of the spindle (75) is characterized by a spiral shape for tightening with nut wherein smooth cut at both ends of the spindle are presented for the purpose of anchoring a wrench when tightening the nut.

Figure 9 illustrates one embodiment of the spindle- driven flange wherein the spindle- driven flange ( 17) is characterized by having an external diameter and a thickness of a small flange (33) that suitably matching a diameter and a thickness of spring-spindle stringing hole of the tailgate bracket of said device set.

The assembly for utilizing during operation, the small flange is inserted the spring- spindle stringing hole (1 1) of the tailgate bracket (42) of said labor-saving truck tailgate device set according to this invention. The size of the internal diameter of flange (37) can be provided the same size or bigger than the size of diameter of spindle (74) so that the spindle (74) suitably matches the center hole of the flange ( 170).

Figure 10 illustrates of the spring-end supporting bracket wherein the bracket is created from a formed metal sheet comprising at least two parts as follows:

The part for supporting the end of spring characterizing by the folded edge to support the end of spring that is provided with the raised portion called a raised edge (38) for receiving the other end of the coiled spring (79). The raised edge of the spring-end supporting bracket (80) may be covered by Nylon 6 engineered plastic or other pressure- resistant material to protect the friction between the other end of the coiled spring (79) and the formed metal sheet of the spring-end supporting bracket (80) and also the truck body (121).

The part for holding to truck body (121) wherein said part is characterizing by the spring- end supporting bracket (80) providing at least one hole (39) for connecting said spring- end supporting bracket (80) to the truck body ( 121). Thus, the said hole is positioning at the same hole of the truck or pick-up truck to anchor said spring- end supporting bracket (80) to avoid perforating the truck body.

Figure 1 1 illustrates one embodiment of the damper with damper bracket wherein the damper (444) takes the retardation to reduce the shock during opening the tailgate ( 111). Moreover, said labor-saving truck tailgate device set take advantage of the strain that has been created by rotation of the coiled spring ( 15) that is the principle during operation according to this invention. Thus, installation of the damper (444) also take the retardation, enhancing the strain of coiled spring.

The other main characteristic of this invention is the damper bracket (40) which is being used for connecting to the truck body ( 121) and the damper bracket (41) for connecting to the tailgate (11 1 j wherein preferably is created from the formed metal sheet comprising at least one hole for connecting the damper (444) and avoiding to perforate the truck body. Thus, the same hole or nut is of the original of the hole or nut of the truck or pick-up truck.

A method of assembling the tailgate bracket (42, 44) Figure 12 illustrates one method of connecting the tailgate bracket of the labor-saving truck tailgate device set according to this invention which comprises:

- the tailgate bracket (42) connects to the spindle (74) of the said labor-saving truck tailgate device set according to this invention is provided at least one bolt (43) for tightening with nut wherein said bolt is selected from the original bolt of the truck or pick-up truck and tightening via bolt anchoring hole ( 10) of the tailgate bracket (42) and the bolt anchoring hole (6) of the tailgate bracket (44). One side of the tailgate bracket (42) is in closed proximity to one side of the tailgate bracket (44) to prevent movement and rotation of both tailgate bracket (42, 44) by means of the tailgate bracket (44) is above of the tailgate bracket (42)

Whereas - the spindle (46) connecting tailgate bracket (44) of the tailgate that is provided the spindle (46) of the tailgate via the bolt stringing hole (9) and assemble to the washer (53) and the bolt head (52) which is the bolt head of the rotational point of the tailgate. The rotational point of the tailgate is the spindle during opening and closing the tailgate (111).

The main characteristic of this invention is the tailgate bracket (42, 44) connecting to the tailgate (111), then the center of the spring-spindle stringing hole (11) of the tailgate bracket (42) of the said labor-saving truck tailgate device set according to this invention, is provided the same center as the center of the spindle (46) of the tailgate.

A method of assembling the spindle-containing spring set to the tailgate bracket

Figure 13 displays one method of assembling the spindle-containing spring set to the tailgate bracket wherein the spindle- containing spring set (555) contains the coiled spring ( 15) which is assembling to the spindle (74) and the tailgate bracket (42) that is held onto the tailgate ( 111). One end of the coiled spring (78) is assembled to the spring- end holding axle ( 12) of the tailgate bracket (42) via one holding method that may be chosen from an insertion. The other end of the spindle (75) which the spiral side is provided for sliding to fit into the groove ( 101) of the spring- spindle stringing hole < 1 1 ) of the tailgate bracket (42), then sliding the spindle- driven flange ( 17) is assembled to the groove < 101 ) of the spring- spindle stringing hole ( 11) wherein the assembling of the spindle- driven flange ( 17) as shown in figure 14 via tightening with the nut (50) from inside to prevent the spindle driven flange (17) to be dislocated from the spring-spindle stringing hole < 1 1) of the tailgate bracket (42).

Figure 14 illustrates one method of the spindle- driven flange wherein the said spindle- driven flange ( 17) is suitably assembled to the spring- spindle stringing hole ( 1 1 ) of the tailgate bracket (42) by means of having the small flange suitably inserted into the spring- spindle stringing hole i l l ) of the tailgate bracket (42) of the said labor-saving truck tailgate device set. The spindle (74) is properly inserted into the center hole of flange (170), then tightening the nut ( 50) from inside that is closed to the spindle- driven flange ( 17) to prevent the spindle- driven flange from moving out from the spring-spindle stringing hole (11) of the tailgate bracket (42). Figure 15 displays one method of the assembling the spindle- containing spring set to the spindle of the tailgate wherein the spindle- containing spring set (555) is characterized by having the spindle taking the same center as the original center of the spindle (46) of the tailgate. The offset bushing is positioned at the one end of the spindle (74) with aim for having the offset bushing covers the bolt head (52) that is the bolt head of the rotational point of the tailgate, thus the center of the spindle (74) of the said labor-saving truck tailgate device set is the same as the original center of the spindle (46) of the tailgate. The ball bearing (14) is assembled to the gap between the offset bushing ( 13) and one end of the spindle (76) of the said labor-saving truck tailgate device set to control the spindle (74) for rotation following the tailgate bracket (42, 44) of the said labor-saving truck tailgate device set according to this invention during opening and closing the tailgate (111) by means ofhaving the offset bushing (13) still being embedded at the same position.

When the coiled spring ( 15) is assembled to the spindle ( 74) , then subsequently connecting to the tailgate bracket (42) via the spring- spindle stringing hole ( 11) by means of tightening with nut (50) from inside. The offset bushing ( 13) assembled to one end of the spindle ( 76) of the spindle (74) that can cover the bolt head (52) that is the bolt head of the rotational point of the tailgate and support to the washer (53) that is the washer for the bolt head (52). The one end of the coiled spring (78) will be assembled to the spring- end holding axle (12) wherein tightening with nut (50) from inside will surely tighten between the offset bushing ( 13) and the washer (53).

Figure 16 illustrates one method for tightening with nut from the inside wherein the method of tightening with nut (50) from inside providing the use of wrench (56) to clamp the end of the spindle, and using the wrench (57) for tightening with nut (50) from inside in close proximity to the tailgate bracket (42), then tightening with nut (60) from outside to anchor the spindle (74) and to hold the tailgate bracket (42).

Figure 17 illustrates one method for tightening with nut from outside wherein the wrench (56) uses for tightening with nut (60) from outside is provided to anchor the spindle (74) to the tailgate bracket (42), whereas the wrench (57) uses for tightening with nut (50) from inside to close to the tailgate bracket (42).

Figure 18 illustrates one embodiment of said labor- saving truck tailgate device set according to this invention when assembling to the tailgate which is characterized by the tailgate bracket (42, 44) that is assembled to the tailgate ( 111), and whereby the spindle (74) is the same as the spindle (46) of the tailgate. The other end of the spindle (75) is assembled with the tailgate bracket (42) via tightening with nut (50, 60) from the inside and outside.

A method of assembling the spring-end supporting bracket to the truck body

Figure 19 illustrates one method for assembling the spring-end supporting bracket to truck bod wherein the spring-end supporting bracket (80) can be in many shapes depending on the holding position of the truck body ( 121). The bracket (80) may be chosen from utilizing at least one nut (61) for acting as a holder of the spring- end supporting bracket (80) with the truck body ( 121 ) via the hole, preferably using the same hole of truck to avoid perforating truck body. The position of the spring- end supporting bracket ( 80) that connects to the truck body is positioned at the raised edge (38) of the spring- end supporting bracket and is same as the other end of the coiled spring (79).

A method of assembling the damper to truck body

Figure 20 illustrate one method of assembling the damper into truck body wherein assembling the damper to the truck body ( 121) using the bolt (63, 64) which can be the same bolt of the truck body ( 121) to hold the damper bracket (40). The main characteristic of this invention is to define the position of the damper head holding unit (65) that is located near the rotational point of the tailgate to make the considerable mechanical disadvantage because it needs the retardation of the damper (444) to reduce the momentum of the rotation of the tailgate ( 1 1 1 ) for the purposes of closing gently. Installation of the damper (444) is located on the same plane of the tailgate ( 111) wherein holding point of the truck bod ( 121) is appropriately positioned near the rotational point of the tailgate ( 111) containing the holding unit at the holding site to truck body ( 121 ). not too far from the rotational point of the tailgate. Thus, the damper can create the retardation that enables the smooth or gentle movement of the tailgate.

A method of assembling the damper to the tailgate

Figure 21 illustrates of one method of assembling the damper to the tailgate wherein assembling the damper (444) to the tailgate (1 11) using the bolt (67, 68) that is the same bolt of the truck or pick up truck to hold the damper bracket (41) for holding to the tailgate (1 11) and a tailgate sling bracket (70) of the truck. Installation o the damper bracket is located on the same plane of the tailgate ( 111). Thus, the damper can create the retardation that make opening the tailgate smoothly. The act of creating the damper bracket (40, 41 ) is depending on the appropriateness of the truck model, for examples, some truck models may design the holding unit to be the same as the bolt bracket of the tailgate.

Detailed of this invention during operation

Figure 22 illustrates one embodiment of the labor- saving truck tailgate device set according to this invention during operation wherein the said labor-saving truck tailgate device set takes the advantage of the strain that is created from the rotation of the coiled spring. During opening the tailgate (1 1 1) will be rotated as indicated by the direction of the arrows. The tailgate bracket (42, 44) is held onto the tailgate ( 111) that is rotated by following the tailgate ( 1 11). While, the coiled spring ( 15) is assembled to the spindle (74). The other end of the spindle (75) containing the spiral will be tightened to the tailgate bracket (42) using the nut (60) from the outside. The washer ( 19) will be rotated following the same direction of the nut (60). The one end of the spindle (76) is assembled to the ball bearing ( 14) that will turn following the same direction of the said one end of the spindle.

The rotation of the spindle- containing spring set (555) comprises the coiled spring ( 15) assembles to the spindle (74) that is provided the same center as the spindle (76) of the tailgate. The tailgate bracket (42, 44) is rotated in the same direction as the tailgate ( 111) movement during opening. The one end of the coiled spring (78) is assembled to spring- end holding axle ( 12) of the tailgate bracket (42) that is held on the tailgate (111), While, the other end of the coiled spring (79) assembled to the raised edge (38) of the spring-end supporting bracket (80) that is held on the truck body (121), causing the twisting of the coiled spring. The strain that is created from twisting of the coiled spring will dampen the speed of the rotation of the tailgate ( 111), so the strain will resist the shock created from the weight of the tailgate ( 111) during opening dow-nward. At the same time, the accumulated strain will labor-save during closing the tailgate (111) by lifting upward to the truck body (121).

The damper (444) will dampen the speed of the tailgate (11 11 during downward rotation that is the same direction as the damper retardation, so the calculation for the size of spring strain and the size of spring according to this invention is more convenient and can reduce the effect from the weight of the tailgate (11 Ti differently from other accessor}' on the tailgate (111) during usage of this invention.

The labor-saving truck tailgate device according to this invention can be adjusted or modified in accordance with the task by means of switching the size of the spring based on the weight of the truck tailgate or based on its user s tasks and preference. For the size and number of spring can be calculated from the formulation of the spring creation or trial and error till get the appropriate size.

Claims

1. A labor-saving truck tailgate device set comprising at least the following components:

- a tailgate bracket for connecting to a spindle-containing spring set wherein a spindle is connected to said tailgate bracket and wherein said tailgate bracket is connected to the tailgate.

- a spindle-containing spring set wherein said spindle-containing spring set is inserted into the spindle wherein one end of said spindle- containing spring set is connected to the spindle of the tailgate via at least one bolt anchoring hole of the tailgate bracket, whereas the other end of the coiled spring is connected to the spindle of said spring set by means of having one end of the coiled spring connected to a spring-end holding axle of the tailgate bracket which is also connected to the spindle, and the other end of the coiled spring is connected to a spring-end supporting bracket, wherein, the spring-end supporting bracket comprises one component for connecting to the truck body and wherein said component comprising at least one hole for anchoring the spring- end supporting bracket to the truck body, and a second component for supporting the end of spring comprising a raised edge for supporting the other end of the coiled spring.

2. The labor- saving truck tailgate device set according to claim 1 wherein the tailgate bracket that connects to the tailgate is created from a formed metal sheet comprising 3 main components: the first component for contacting the bottom of the tailgate for connecting said bracket to the bottom of the tailgate, the second component for contacting the side of the tailgate for connecting said bracket to the side of the tailgate, and the third component for contacting the spindle of the tailgate for connecting to the spindle of the tailgate

3. The labor- saving truck tailgate device set according to claim 2 wherein the first component for contacting the bottom of the tailgate comprises at least one bolt anchoring hole for connecting a bolt at the bottom of the tailgate.

4. The labor-saving track tailgate device set according to claim 3 wherein the bolt anchoring hole for holding at the bottom of the tailgate is at the same position as the bolt anchoring hole of the spindle connecting tailgate bracket.

5. The labor-saving truck tailgate device set according to claim 4 wherein the bolt anchoring hole is of the original position as the hole of the truck.

6. The labor- saving truck tailgate device set according to claim 2 wherein the second component for contacting the side of the tailgate comprises at least one bolt anchoring hole for connecting the bolt to the side of the tailgate.

7. The labor-saving truck tailgate device set according to claim 6 wherein the bolt anchoring hole for holding the said bracket to the side of the tailgate containing two holes.

8. The labor- saving track tailgate device set according to claim 2 wherein the third component for contacting the spindle of the tailgate comprising at least one bolt stringing hole for stringing a bolt head which is the bolt head of the rotational point of the tailgate via an offset bushing that is the spindle of the tailgate.

9. The labor-saving truck tailgate device set according to claim 2 wherein the formed metal sheet of the second component for connecting the tailgate bracket to the side of the tailgate comprises the same core as the third component for connecting the spindle of the tailgate to the spindle-containing spring set.

10. The labor- saving truck tailgate device set according to claim 2 wherein the first component for contacting the tailgate bracket at the bottom of the tailgate is on a different plane from the second component for contacting at the side of the tailgate and the third embodiment for contacting to the spindle of the tailgate.

1 1. The labor- saving truck tailgate device set according to claim 1 wherein the spindle- connecting tailgate bracket which is created from the formed metal sheet comprises 3 main components: the first component at the bottom of the tailgate for connecting the tailgate bracket to the bottom of the tailgate, the second component for the spindle of the spindle-containing spring set. and the third component for the coiled spring of the spindle- containing spring set.

12. The labor- saving truck tailgate device set according to claim 1 1 wherein the first component comprising at least one bolt anchoring hole.

13. The labor- saving truck tailgate device set according to claim 1 1 wherein the second component comprising at least one spring-spindle stringing hole

14. The labor- saving truck tailgate device set according to claim 13 wherein the spring- spindle stringing hole has the same rotational center as the spindle of the tailgate, which is the same center as the bolt stringing hole of the tailgate bracket, connecting to the spindle of the tailgate.

15. The labor saving truck tailgate device set according to claim 1 1 wherein the spring- spindle stringing hole having an opening channel between the edge of the stringing hole and the edge of the second component for the spindle of the spindle-containing spring set wherein the opening channel is not a closed loop.

16. The labor- saving truck tailgate device set according to claim 1 1 wherein the third component of the coiled spring of the spindle- containing spring set is inserted into one end of the coiled spring of the spindle- containing spring set providing that the end of coiled spring holding unit having a channel to support the end of the spring which is the spring-end holding axle.

17. The labor-saving truck tailgate device set according to claim 16 wherein one component of the spring- end holding axle may be chosen from a tube or a channel with an inner cavity for inserting one end of the spring.

18. The labor-saving truck tailgate device set according to claim 16 wherein the size of the spring-end holding axle is suitable for inserting one end of the coiled spring (78).

19. The labor- saving truck tailgate device set according to claim 1 1 wherein the first component, the second component, and the third component are making angles to another other and are located on different planes.

20. The labor- saving truck tailgate device set according to claim 1 wherein the act of connecting the tailgate bracket to the tailgate is provided that one side of the tailgate bracket is in close proximity to the other side of the tailgate bracket (44) to prevent movement and rotation of both sides of the tailgate bracket wherein the tailgate bracket ( 44) is located above of the tailgate bracket.

21. The labor- saving truck tailgate device set according to claim 1 wherein the spindle- containing spring set is provided so that the spindle is of the same center as the spindle of the tailgate.

22. The labor- saving truck tailgate device set according to claim 1 wherein the spindle- containing spring set comprises an offset bushing, a ball bearing, a coiled spring, a set of nuts for tightening from inside and outside, a spindle- driven flange, a spindle, and a washer

23. The labor- saving truck tailgate device set according to claim 22 wherein the offset bushing is characterized by having one end for covering a ball bearing lathed down into a groove for covering and connecting to the diameter of the ball bearing so that the depth suitably fits the thickness of ball bearing and wherein the other end for inserting or covering with a bolt head which is a bolt head for tailgate spindle is lathed down into a groove for covering and connecting to the width of the bolt wherein the depth suitably fits the width of bolt so that this end of offset bushing completely covers the bolt head.

24. The labor- saving truck tailgate device set according to claim 22 wherein the offset bushing supports or anchors to the washer which is a rotational point bolt head of the tailgate that supports the spindle connecting tailgate bracket.

25. The labor-saving truck tailgate device set according to claim 22 wherein one end of the ball bearing is inserted into one end of the spindle and the other end of the ball bearing is inserted to the offset bushing.

26. The labor-saving truck tailgate device set according to claim 22 wherein the coiled spring assembles with the spindle by insertion so that one end of the spindle is inserted to the core of the coiled spring.

27. The labor-saving truck tailgate device set according to claim 22 wherein one end of the coiled spring for connecting to the spring- end holding axle of the spindle connecting tailgate bracket and the other end of the coiled spring for anchoring to the spring- end supporting bracket.

28. The labor-saving truck tailgate device set according to claim 22 wherein the spindle- driven flange is characterized by having an external diameter and a thickness of a small flange suitably matches a diameter and a thickness of spring-spindle stringing hole of the tailgate bracket.

29. The labor-saving truck tailgate device set according to claim 22 wherein the spindle- driven flange providing that the small flange is suitably inserted into the spring- spindle stringing hole of the tailgate bracket and the size of inside diameter of flange suitably fits into the central hole of the flange.

30. The labor-saving truck tailgate device set according to claim 22 wherein the spindle is created from the lathe formed steel axle that can be in a rod shape or spiral shape and wherein one end of the spindle is lathed to a suitable size for connecting to the inside diameter of the ball bearing that may be chosen from a smooth surface without spiral or containing a spiral, and wherein the other end of the spindle providing a spiral for tightening with nut and is smoothen at both ends of the spindle.

31. The labor-saving truck tailgate device set according to claim 30 wherein the other end of the spindle is provided for connecting with the tailgate bracket via the spring- spindle stringing hole of the tailgate bracket that contains nuts for tightening from inside and outside, the spindle-driven flange, and the washer.

32. The labor-saving truck tailgate device set according to claim 1 wherein the spring- end supporting bracket is created from a formed metal sheet with two parts: the part for supporting the end of spring containing a raised edge and the part for connecting to the truck body comprising at least one hole.

33. The labor-saving truck tailgate device set according to claim 32 wherein the part for supporting the end of spring is characterized by having a folded edge to support the end of spring that is provided with a raised portion called a raised edge for receiving the other end of the coiled spring.

34. The labor-saving truck tailgate device set according to claim 33 wherein said raised edge has been covered by Nylon 6 engineered plastic.

35. The labor-saving truck tailgate device set according to claim 32 wherein the part for connecting to the truck body comprises at least one hole.

36. The labor-saving truck tailgate device set according to claim 35 wherein the hole is at the same position as the hole of the truck.

37. The labor-saving truck tailgate device set according to claim 1 wherein the damper with the damper bracket is connected to said device set for helping to reduce shock of the tailgate.

38. The labor-saving truck tailgate device set according to claim 37 wherein the damper bracket for connecting to the truck body and the for connecting to the tailgate is preferabl the formed metal sheet comprising at least one hole for holding the damper.

39. The labor-saving truck tailgate device set according to claim 38 wherein the hole is on the same position as the hole of the truck by using the bolt to hold the damper bracket for connecting the tailgate and the tailgate sling bracket.

40. The labor-saving truck tailgate device set according to claim 38 wherein the damper bracket comprising a damper head holding unit that is located in close proximity to the rotational point of the tailgate wherein said position causing considerable mechanical disadvantage.

41. The labor-saving truck tailgate device set according to claim 37 wherein installation of the damper bracket is located on the same plane as the tailgate.

42. The labor-saving truck tailgate device set according to claim 38 wherein the damper is on the same plane as the tailgate which is the connecting point of the truck body, and is preferably positioned below and in close proximity to the rotational point of the tailgate containing the connecting unit at the connecting site to truck body which is in close proximity to the rotational point of the tailgate.

43. The labor-saving truck tailgate device set according to claim 1 wherein the tailgate bracket and the spring-end supporting bracket are connected by at least one bolt.

44. The labor-saving truck tailgate device set according to claim 43 wherein the spindle connecting tailgate bracket provides at least one bolt for tightening to the tailgate.

45. The labor-saving truck tailgate device set according to claim 43 wherein the spring- end supporting bracket is provided for connecting to the truck body using at least one nut