CN103407477B - Tailgate Assembly for Combined Folding Trailer - Google Patents

Abstract

The invention discloses a rear baffle plate component for a combined type folding trailer, which comprises a rear baffle plate and a connecting piece, wherein the rear baffle plate is connected with the connecting piece; the rear baffle is provided with rear connecting bosses, and each rear connecting boss is provided with a rear shaft hole, a bearing convex plate and a limiting lock hole; each connecting piece is provided with a first pivot hole, a rear furling abutting surface, a rear unfolding abutting surface, a rear arc-shaped transition surface, a second pivot hole, a furling bearing surface, an unfolding bearing surface and a locking screw hole, wherein the rear furling abutting surface is perpendicular to the rear unfolding abutting surface; the distance between the central axis of the first pivot hole and the rear unfolding abutting surface is greater than the distance between the central axis and the rear folding abutting surface; each rear connecting boss is rotationally connected with a corresponding connecting piece through a pin shaft; a limit screw is arranged in the locking screw hole of the connecting piece and extends into or moves out of the corresponding limit lock hole in the reciprocating rotation process; the bearing convex plate can drive the connecting piece to rotate. The invention can reduce the whole occupied space, thereby being convenient for carrying and storage.

Description

Tailgate Assembly for Combined Folding Trailer

technical field

The invention relates to the technical field of trailers, in particular to a tailgate assembly for a combined foldable trailer.

Background technique

People often use four-wheel trailers when shopping and carrying items, which can save energy for users. However, four-wheel trailers are generally large in size at present, cannot be folded and folded, are inconvenient to carry, and take up a lot of space when stored.

Patent document CN202186404U discloses a foldable luggage cart, which includes a telescopic frame, the lower part of which is provided with a cylindrical push-pull rod hinged to the load-carrying bottom plate of the luggage cart, and the upper part of the cylindrical push-pull rod is provided with a first annular groove , the lower end surface of the first annular groove is provided with a first helical guide surface; the load-bearing bottom plate is folded and attached to the frame, and it is arranged perpendicular to the frame after unfolding for carrying luggage; the side of the load-bearing bottom plate connected to the frame is provided with The wheel vertical stroke control part fixedly connected with the bearing base plate; the wheel bracket has a second annular groove adapted to fit with the cylindrical push-pull rod, and the upper end surface of the second annular groove is provided with the first spiral guide. The second spiral guide surface matched with the guide surface, a rotating torsion spring is fixed and seated in the second annular groove; the push-pull rod is vertically installed in the second annular groove, and the shaft hole at the lower part of the push-pull rod is socketed in the vertical stroke of the wheel In the shaft of the control part; when the bearing base plate is unfolded, the wheel vertically forms the control part to push the second annular groove, and is guided under the joint action of the first helical guide surface and the second helical guide surface The wheel moves up vertically and rotates outward on both sides. When the load-bearing base plate is folded, the wheel rotates back under the action of the torsion spring and moves vertically downward; the wheel edge of the folded wheel protrudes from the folded load-bearing Bottom edge of base plate.

This patent document describes in detail the mechanism and working principle of the foldable wheels. However, this kind of foldable luggage cart cannot be widely used in factory workshops because it is a push-pull cart with only two wheels and has a small load-carrying force.

Contents of the invention

The object of the present invention is to provide a tailgate assembly for a foldable trailer that can reduce the overall occupied space and is easy to carry and store.

The technical solution to achieve the purpose of the present invention is: a tailgate assembly for a combined folding trailer, including a tailgate and a connecting piece that is rotatably connected to the tailgate; A rear connection boss, each rear connection boss is provided with a rear shaft hole, a load-bearing convex plate protruding outward along the lateral direction of the rear carrier, and a limit lock hole matched with the locking screw hole on the connector; The front ends of each connector are provided with a first pivot hole, a rearwardly folded abutment surface, a rearwardly unfolded abutment surface, and a rear arc-shaped transition surface connecting the rearwardly folded abutment surface and the rearwardly expanded abutment surface, and the rearwardly folded abutment surface perpendicular to the rear abutting surface; the distance between the central axis of the first pivot hole and the rear abutting surface is greater than the distance between the central axis and the rear abutting surface; Rotationally connected second pivot hole, folded load-bearing surface, unfolded force-bearing surface and locking screw hole, the second pivot hole is located between the locking screw hole and the first pivot hole, and the folded force-bearing surface is located on the second The pivot hole is away from the side of the first pivot hole, and the expanded load-bearing surface is located on the side of the second pivot hole close to the first pivot hole; each rear connecting boss and a corresponding connecting piece pass through the rear axle hole and the first pivot hole. The pin shafts of the two pivot holes are connected by rotation; a limit screw is set in the locking screw hole of the connecting piece, and in the process of reciprocating rotation, it extends into or moves out of the corresponding limit lock hole; As the rear connecting boss rotates around the second pivot hole, it can abut against the retracted force-bearing surface and the unfolded force-bearing surface of the connecting piece, thereby driving the connecting piece to rotate.

When the present invention is in use, the load-bearing convex plate drives the rotation of the external connecting piece and limits the rotation angle of itself, and realizes folding, effectively reducing the overall occupied space, thereby facilitating portability and storage.

Description of drawings

Fig. 1 is a kind of side view of the present invention;

Figure 2 is an exploded view of the tailgate assembly shown in Figure 1;

Fig. 3 is a three-dimensional schematic diagram of the combined folding trailer made of the tailgate assembly shown in Fig. 1 when it is in an unfolded state;

Fig. 4 is a schematic diagram of a three-dimensional structure of the front frame assembly in the trailer shown in Fig. 3;

Fig. 5 is an exploded view of the front frame assembly shown in Fig. 4;

Figure 6 is an exploded view of the front frame assembly shown in Figure 4 viewed from another angle;

Fig. 7 is a schematic diagram of a three-dimensional structure of the rear frame assembly in the trailer shown in Fig. 3;

Figure 8 is an exploded view of the rear frame assembly shown in Figure 7;

Fig. 9 is a perspective view of the rear frame assembly shown in Fig. 7 viewed from another angle;

Fig. 10 is a schematic diagram of a three-dimensional structure of the trailer shown in Fig. 3 when it is in a flattened state;

Fig. 11 is a perspective view of the trailer shown in Fig. 10 viewed from another angle;

Figure 12 is a side view of the trailer shown in Figure 10;

Fig. 13 is a schematic diagram of a three-dimensional structure of the trailer shown in Fig. 3 when it is in a preliminary folded state;

Figure 14 is a side view of the trailer shown in Figure 13;

Fig. 15 is a partially enlarged schematic diagram of place A in Fig. 14;

Fig. 16 is a partially enlarged schematic diagram of place B in Fig. 14;

Fig. 17 is a schematic diagram of a three-dimensional structure of the trailer shown in Fig. 3 when it is in a fully folded state;

FIG. 18 is a side view of the trailer shown in FIG. 17. FIG.

The marks shown in the accompanying drawings are:

Front frame assembly 1, front load rack 11, front strut 111, front limit block 112, front limit tooth groove 113, front pin hole 114, front wheel assembly 12, front bushing 121, front wheel frame 122 , front torsion spring 123, front wheel 124, front limit tooth 125, front baffle plate 13, front connecting boss 131, front axle hole 132, front folded abutment surface 133, front unfolded abutment surface 134, front arc Transition surface 135, rotating connection part 136, clamping plate 137, tie rod 14, rear frame assembly 2, rear load rack 21, rear sliding column 211, rear limit block 212, rear limit tooth groove 213, rear pin hole 214, rear wheel assembly 22, rear casing 221, rear wheel frame 222, rear torsion spring 223, rear wheel 224, rear limit protruding teeth 225, rear baffle plate 23, rear connecting boss 231, rear axle hole 232, bearing Force convex plate 233, limit lock hole 234, connecting piece 24, first pivot hole 241, rear folded abutment surface 242, rear unfolded abutment surface 243, rear arc-shaped transition surface 244, second pivot hole 245, Folding bearing surface 246, unfolding bearing surface 247, locking screw hole 248, limit screw 25, coupling mechanism 3, front coupling rod 31, screw hole 311, front pin connection part 32, rear coupling rod 33, locking hole 331, the rear pin is connected to the connection part 34, the locking screw 35, the connecting pin 36, and the pin 100.

Detailed ways

(Example 1)

This embodiment is a tailgate assembly for a combined folding trailer, as shown in Figure 1 and Figure 2, including a tailgate and a connecting piece that is rotatably connected to the tailgate; the left and right sides of the bottom of the tailgate Each end is provided with a rear connecting boss 231, and each rear connecting boss is provided with a rear shaft hole 232, a load-bearing convex plate 233 protruding outward along the lateral direction of the rear carrier, and a locking screw hole corresponding to the connecting piece. Cooperating limit lock hole 234; the front end of each connector is provided with the first pivot hole 241, the rear abutment surface 242, the rear expansion abutment surface 243, and the connection between the rear abutment surface and the rear deployment abutment surface The rear arc-shaped transition surface 244, the rear abutment surface is perpendicular to the rear expansion abutment surface; each connecting piece is connected with a corresponding rear sliding column through the pin shaft 100 passing through the first pivot hole and the rear pin hole 214, and the second The distance a between the central axis of a pivot hole and the rear unfolded abutment surface is greater than the distance b between the central axis and the rear folded abutment surface; each rear unfolded abutment surface is parallel to the plane where the tailgate body is located, and each rear folded abutment The joint surface is perpendicular to the plane where the tailgate is located; the rear end of each connecting piece is provided with a second pivot hole 245 for rotating connection with the tailgate, a folded bearing surface 246, an unfolded bearing surface 247 and a locking screw hole 248 The second pivot hole 245 is located between the locking screw hole 248 and the first pivot hole 241, the fold bearing surface is located on the side of the second pivot hole away from the first pivot hole, and the unfold bearing surface is located on the second pivot hole. The pivot hole is close to one side of the first pivot hole; each rear connecting boss and a corresponding connecting piece are rotatably connected by a pin shaft 100 passing through the rear axle hole and the second pivoting hole; a limit screw 25 is arranged on the connecting piece and in the process of reciprocating rotation, extend into or move out of the corresponding limit lock hole 234; when the load-bearing convex plate rotates around the second pivot hole with the rear connecting boss, It can be abutted against the retracted force-bearing surface and the unfolded force-bearing surface of the connecting piece, thereby driving the connecting piece to rotate.

(Application example)

This application example is a combined folding trailer made by the above-mentioned embodiment 1, including a front frame assembly 1, a rear frame assembly 2 and a coupling mechanism 3 for connecting the front frame assembly and the rear frame assembly.

The specific structure of this application example when it is in the unfolded state is shown in Figures 1 to 9, the front frame assembly includes a front carrier 11, two front wheel assemblies 12, a front baffle 13 arranged at the front end of the front carrier, and the pull rod 14 arranged on the front baffle; the left and right sides of the front end of the front load rack are each provided with a forward protruding front strut 111, and each front strut is provided with an annular front limit block 112, each The front end of the front limit stop platform is provided with a plurality of front limit tooth grooves 113; the front ends of each front strut are provided with front pin holes 114; each front wheel assembly includes a front wheel frame 122 with a front sleeve 121, a front torsion spring 123 and rotate the front wheel 124 that is arranged on the front wheel frame; the rear end of each front sleeve pipe is provided with the front limit convex tooth 125 that cooperates with each front limit tooth groove; The front torsion spring is sleeved on the corresponding front strut and located in the front sleeve;

Two front connecting bosses 131 are arranged on the front baffle, and each front connecting boss is provided with a front axle hole 132, a front folding abutment surface 133, a front unfolding abutment surface 134, and a front folding abutment surface and a front connecting surface. Expand the front arc-shaped transition surface 135 of the abutment surface; the distance between the central axis of the front axle hole and the front unfolded abutment surface is greater than the distance between the central axis and the front folded abutment surface; each front connecting boss passes through the front axle hole The pin shaft 100 corresponding to a front pin hole is rotationally connected with the front strut; each front unfolded abutment surface is parallel to the plane where the front baffle is located, and each folded abutment surface is perpendicular to the plane where the front baffle is located.

The rear frame assembly includes a rear carrier 21 , two rear wheel assemblies 22 , a tailgate 23 arranged at the rear end of the rear carrier, and two connectors 24 for connecting the rear carrier and the rear carrier.

The left and right side ends of the rear end of the rear carrier are respectively provided with a rearwardly protruding rear sliding column 211, each rear sliding column is provided with an annular rear limit stop platform 212, and the rear end of each rear limit stop platform is provided with multiple a rear limit tooth groove 213; the rear end of each rear sliding column is provided with a rear pin hole 214;

The front ends of each connector are provided with a first pivot hole 241, a rear folded abutment surface 242, a rear expanded abutment surface 243, and a rear arc-shaped transition surface 244 connecting the rear folded abutment surface and the rear expanded abutment surface. The folded abutment surface is perpendicular to the rear unfolded abutment surface; each connecting piece is connected to a corresponding rear sliding column through the pin shaft 100 passing through the first pivot hole and the rear pin hole 214, as shown in Figure 8, the first pivot The distance a between the central axis of the connecting hole and the rear expanded abutment surface is greater than the distance b between the central axis and the rear folded abutment surface; each rear expanded abutment surface is parallel to the plane where the tailgate is located, and each rear gathered abutment surface is perpendicular to The plane where the rear baffle is located; the rear end of each connector is provided with a second pivot hole 245 for rotating connection with the rear baffle, a retracting force-bearing surface 246, an unfolding force-bearing surface 247 and a locking screw hole 248, the second pivot The connection hole 245 is located between the locking screw hole 248 and the first pivot hole 241, the retracted force-bearing surface is located on the side away from the first pivot hole, and the expanded force-bearing surface is located near the second pivot hole. one side of the first pivot hole;

Each rear wheel assembly comprises a rear wheel frame 222 with a rear sleeve 221, a rear torsion spring 223 and a rear wheel 224 that is rotatably arranged on the rear wheel frame; The rear limiting protruding tooth 225; the rear casing sleeve is set on a corresponding rear sliding column, and the rear torsion spring is sleeved on the corresponding rear sliding column and is located in the rear casing;

The tailgate is provided with two rear connecting bosses 231, and each rear connecting boss is provided with a rear axle hole 232, a force-bearing convex plate 233 protruding outwards along the transverse direction of the rear carrier, and a locking screw on the connecting piece. The limit lock hole 234 that the holes match; each rear connecting boss and a corresponding connecting piece are connected by the pin shaft 100 passing through the rear axle hole and the second pivot hole; a limit screw 25 is arranged on the locking part of the connecting piece In the screw hole, and in the process of reciprocating rotation, it extends into or moves out of the corresponding limit lock hole 234; when the load-bearing convex plate rotates around the second pivot hole with the rear connecting boss, it can abut against On the folded load-bearing surface and unfolded load-bearing surface of the connector, the connector is driven to rotate.

In this application example, the coupling mechanism 3 includes two front coupling rods 31 with screw holes 311 arranged on the left and right side ends of the rear end of the front carrier, and a front pin connection portion 32 fixedly arranged on the bottom wall of each front coupling rod. Two rear connecting rods 33 with locking holes 331 arranged on the left and right sides of the front end of the rear carrier, the rear pin-connecting portion 34 fixedly arranged on the bottom wall of each rear connecting rod, two locking screws 35, And two connecting pin shafts 36; Each front pin connecting portion and the rear pin connecting portion are connected by a connecting pin rotation, when the upper surface of the front carrier and the upper surface of the rear carrier are in the same plane, each screw hole 311 A locking hole 331 is arranged in the transverse direction, and each locking screw 35 is located in a corresponding screw hole 311, and in the process of reciprocating rotation, it extends into or moves out of the corresponding locking hole 331; the front frame assembly and The rear vehicle frame assembly can be rotated 180 degrees around the connecting pin shaft 36 and stacked.

In this application example, the end of the front baffle close to the front connecting boss is provided with a rotating connection portion 136 with a pin hole, and the end of the front baffle far away from the front connecting boss is provided with two protruding clamping plates 137; The rotating connection part of the front baffle is connected in rotation, and the middle part of the pull rod can be clamped and connected between the two clamping plates. In practice, the pull rod can also be fixedly arranged on the front baffle.

When this application example is in the unfolded state, as shown in Figures 1 to 9, the upper surfaces of the front carrier and the rear carrier are on the same plane, and the front carrier and the rear carrier are connected by a coupling mechanism and locked by a lock. The tightening screw 35 is screwed into the screw hole 311 and extends into the locking hole 331 to lock the front carrier and the rear carrier. At this time, in the front frame assembly, the front baffle is perpendicular to the front load rack, and the front abutment surface 134 on the front limit stop is parallel to the plane where the front baffle is located, and abuts against the front end of the front sleeve 121 On the surface, at the same time, each front limiting protruding tooth at the rear end of the front casing is embedded in the corresponding front limiting tooth groove, and the front limiting tooth groove has the effect of restricting the rotation of the front casing, so that the front wheel at this time Perpendicular to the plane where the front load rack is located, it can be rolled to achieve normal dragging. In the rear frame assembly, the tailgate is perpendicular to the plane where the rear cargo rack is located, and the load-bearing convex plate 233 of the rear connecting boss abuts on the folded force-bearing surface 246 of the connector, and the folded force-bearing surface is in this state In addition, at this time, turn the limit screw 25 to make it pass through the locking screw hole 248 of the connecting piece and then extend into the limit position on the corresponding rear connecting boss 231. lock hole 234, so as to lock the tailgate 23 and the connecting piece, effectively preventing the tailgate from rotating backward under the extrusion of the goods; the rear abutment surface 243 in each connecting piece is parallel to plane, and abut against the rear end surface of the corresponding rear sleeve, so that each rear limit protruding tooth at the front end of the rear sleeve is embedded in the rear limit tooth groove, and the rear limit tooth groove has a limit on the rear sleeve The rotation effect makes the rear wheels at this time perpendicular to the plane where the rear load rack is located, and can roll to achieve normal towing.

The specific structure of this application example in the flattened state is shown in Fig. 10 to Fig. 12. In the unfolded state shown in Fig. Move out, and the external force pushes the rear baffle to rotate backward around the rear shaft hole 232 until the load-bearing convex plate 233 abuts on the expanded force-bearing surface 247 of the connector. At this time, the upper surface of the rear baffle and the upper surface of the rear carrier Being on the same plane, under the limiting action of the expanded load-bearing surface 247 of the connecting piece, it can prevent the tailgate from continuing to rotate backward; this structure can also use the tailgate as a loading board, effectively increasing the load-bearing area of the trailer .

The specific structure of this application example in the preliminary folded state is shown in Figure 13 to Figure 16. In the unfolded state shown in Figure 1, the rear baffle is directly pushed forward under the action of external force, because the load-bearing convex plate on the rear baffle 233 abuts on the folded force-bearing surface 246 of the connector, thereby driving the connector to rotate forward around the first pivot hole 241 until the rear folded abutment face 242 is perpendicular to the plane where the rear carrier is located and abuts against the rear cover On the rear end face of the pipe, since the distance between the central axis of the first pivot hole and the rear unfolded abutment surface is greater than the distance between the central axis and the rear folded abutment surface, the rear sleeve will Under the action of the elastic force of the rear torsion spring 223, it slides backward for a certain distance, so that the rear limiting teeth move out from the corresponding rear limiting tooth grooves. Since the rear limiting tooth grooves no longer have the effect of restricting the rotation of the rear casing, Therefore, the rear bushing will drive the rear wheel frame 222 and the rear wheel 224 to rotate at a certain angle under the torsion force of the rear torsion spring to overlap with the rear carrier. In addition, in the unfolded state shown in FIG. 1 , the external force pushes the front baffle backward, and drives the front connecting boss 131 to rotate backward around the front shaft hole 132 until the front folded abutment surface 133 abuts against the front end surface of the front casing. Since the distance between the central axis of the front axle hole and the front unfolded abutment surface is greater than the distance between the central axis and the front stowed abutment surface, the front bushing will slide forward during the backward rotation of the tailgate A certain distance, so that the front limit teeth move out from the corresponding front limit tooth grooves, because the front limit tooth grooves no longer have the effect of restricting the rotation of the front sleeve, so the front sleeve will be under the torsion of the front torsion spring, After driving the front wheel frame and the front wheel to rotate a certain angle, they are overlapped with the front loading frame.

The specific structure of this application example in the fully folded state is shown in Figures 17 to 18. In the preliminary folded state shown in Figure 13, turn the locking screw 35 to move its end out of the locking hole 331. At this time, the front carrier and The rear carrier can rotate around the connecting pin shaft 36, and after turning 180 degrees, the bottom surface of the front carrier adjoins the bottom surface of the rear carrier; into the locking hole 331, so that the front carrier and the rear carrier are locked again so that the two will not be separated by themselves.

In addition, this application example also has a feature, that is, after the connecting pin shaft 36 is removed (because in practice, the bolt assembly can be used instead of the riveted pin in this application example as the connecting pin shaft, and its disassembly and assembly are relatively simple) , both the front frame assembly and the rear frame assembly can independently become a two-wheeled folding trailer; for the front frame assembly, the pull rod continues to be used as a towing grip bar, and the front carrier continues to be a carrier; but for the rear As far as the vehicle frame assembly is concerned, the pole column adjacent to the front loading rack in the rear vehicle frame assembly is used as a dragging and holding bar, and the tailgate is used as a loading plate.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (1)

1. for a back shield assembly for modular folding trailer, the attaching parts (24) comprising back shield (23) and be rotationally connected with rear plate washer; It is characterized in that: connect boss (231) after the left and right sides end bottom back shield is respectively provided with one, each rear connection boss is provided with rear axis hole (232), along the load flange (233) of rear luggage carrier horizontal direction evagination and the spacing lockhole (234) that matches with locking screw holes on attaching parts; The front end of each attaching parts is provided with the first pivoted hole (241), rear gathering bearing surface (242), rear expansion bearing surface (243) and draws the rear arc transition face (244) of bearing surface and rear expansion bearing surface after connecting in, and rear gathering bearing surface is perpendicular to rear expansion bearing surface; The central axis of the first pivoted hole and the distance of rear expansion bearing surface are greater than the distance of this central axis and rear gathering bearing surface; The rear end of each attaching parts being provided with the second pivoted hole (245) for being rotationally connected with back shield, drawing bearing area (246) in, launching bearing area (247) and locking screw holes (248), second pivoted hole (245) is positioned between locking screw holes (248) and the first pivoted hole (241), draw bearing area in and be positioned at the side of the second pivoted hole away from the first pivoted hole, launch bearing area and be positioned at the side of the second pivoted hole close to the first pivoted hole; Each rear connection boss and a corresponding attaching parts are rotationally connected by the bearing pin (100) through rear axis hole and the second pivoted hole; A stop screw (25) is arranged in the locking screw holes of attaching parts, and in the process of reciprocal turn, stretches into or shift out corresponding spacing lockhole (234); Load flange, in the process of rotating around the second pivoted hole along with rear connection boss, can be connected to the gathering bearing area of attaching parts and launch in bearing area, and then band follower link rotates.