CN107351775B - Vehicle-mounted bicycle top frame - Google Patents

Abstract

The vehicle-mounted bicycle roof frame includes a front beam and a rear beam that are arranged along the left and right horizontal directions. The lower parts of the two ends of the front beam and the rear beam are provided with claws that are fastened to the two roof bars on the roof of the car. The front beam Two groups of handlebar positioning installation assemblies for fixing the handlebars of bicycles are slidably arranged on the upper left and right horizontal directions, and two groups of rear wheel positioning installation assemblies for fixing the rear rims of bicycles are arranged on the rear beam along left and right horizontal directions. The invention fully considers the characteristics of the moving process of the automobile. After the bicycle is turned upside down, the bicycle is positioned and locked by the handlebar and the rear wheel rim. It has strong positioning reliability, greatly reduces the center of gravity, and ensures the stability of the vehicle when it is running at high speed and turning. The invention only needs one person to complete the positioning and clamping of the whole bicycle, is simple to use, does not need to dismantle the wheels, can be installed without damage, and is convenient for arranging multiple bicycles.

Description

Car bike top rack

technical field

The invention relates to the technical field of outdoor products for automobiles, in particular to a top frame for a vehicle-mounted bicycle.

Background technique

With the improvement of people's living standards, many families often take sports equipment such as mountain bikes when traveling or exercising by themselves. Due to the relatively large dimensions of the mountain bike, it can only be fixed and supported by means of external devices on the vehicle body.

The traditional bicycle top rack bicycle stands upright on the roof, and the front and rear wheels and inclined beams (or front forks) are used to fix the car body at three points to limit the position of the bicycle. Its shortcomings mainly include three aspects:

(1) According to the principle of six-point positioning, the bicycle has six degrees of freedom in space, that is, the degree of freedom of movement along the three rectangular coordinate axes of x, y, and z and the degree of freedom of rotation around these three coordinate axes. Therefore, to fully define the bike's position, the positioning elements should be as non-coplanar as possible. However, the traditional bicycle top frame can only limit three of the six degrees of freedom in the space positioning of the bicycle according to the analysis of the six-point positioning principle of the space positioning of the object because its three limit points are basically on the same plane. In the direction perpendicular to the positioning plane, all degrees of freedom of the bicycle cannot be completely restricted.

(2) The bicycle stands upright on the roof, and its overall height and center of gravity are high. For a car in high-speed motion, the higher the center of gravity, the worse the stability of high-speed cornering. Poor stability during driving According to the regulations of "Classification and Codes of Hazardous and Harmful Factors in the Production Process" (GB/T 13861-1992), an excessively high center of gravity is a physical harmful factor that should be avoided during the movement of the car.

(3) In addition, after the bicycle is fixed to the roof of the car, it is still relative to the car. The center of gravity of the stationary bicycle is very small, almost (1000mm (front and rear) * 4mm (left and right)), when the center of gravity leaves the left and right 4mm wide boundaries, The bicycle just falls to the left (or right). Therefore, in the design of the vehicle-mounted bicycle top frame, it is particularly important to prevent rollover. The traditional bicycle top frame is basically on the front and rear surfaces because of its three limit points, while the limit points on the left and right sides If the bit distance is too short (tire width or axle length), its stability is poor.

It is also possible to remove the front wheel of the bicycle and directly fix the front fork and the rear wheel on the luggage rack. Although the center of gravity is slightly lowered in this way, the positioning point is still basically on the front and rear planes, and the upper limit distance on the left and right planes is still very short. , and the front wheel of the bicycle needs to be removed before departure. After arriving at the destination, it is necessary to repeatedly install the tire and adjust the brakes, which is inconvenient for outdoor travel.

Contents of the invention

In order to solve the deficiencies in the prior art, the invention provides a vehicle-mounted bicycle top frame that can lower the center of gravity of the bicycle, has strong stability, and is convenient and fast for bicycle loading and unloading.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: the vehicle-mounted bicycle top frame includes front beams and rear beams that are arranged along the left and right horizontal directions, and the lower parts of the two ends of the front beam and the rear beam are all provided with fastening joints that are connected to the car. The claws on the two roof bars on the top, two sets of handlebar positioning installation components for fixing the handlebars of the bicycle are arranged on the front cross member sliding along the left and right horizontal directions, and the two sets of handlebar positioning installation components for fixing the bicycle are arranged on the rear cross member sliding along the left and right horizontal directions. Two sets of rear wheel positioning installation components for the rear rim, a set of handlebar positioning mounting components on the left and a set of rear wheel positioning mounting components on the left are used to position and install an inverted bicycle, and a set on the right The handlebar positioning mounting assembly is used in conjunction with a group of rear wheel positioning mounting assemblies on the right side to be used for positioning and installing another inverted bicycle.

Each set of handlebar positioning and installation components includes a handlebar left fixing piece and a handlebar right fixing piece with the same structure; the handlebar left fixing piece includes two front sliders and a front slider, and the inside of the front cross member is along the left and right horizontal direction There is a front slide hole, and the top of the front cross beam is provided with a front guide hole which is connected with the front slide hole and has the same length as the front slide hole. The width of the front guide hole is smaller than the width of the front slide hole. There is a mounting plate, and the two front sliders are slidably fitted in the front sliding holes and correspondingly located directly under one mounting plate. Each mounting plate is correspondingly threaded with a front sliding block through a front sliding bolt passing through the front guide hole. The top of the front sliding seat is hinged with the front pressure plate through the front pin shaft along the rear side. The front side of the front pressing plate and the front side of the top of the front sliding seat are connected by a fastening bolt. A cylindrical clamping cavity is provided in the left and right directions, and the left side of the handlebar extends into the clamping cavity. Under the action of the fastening bolts, the front pressure plate compresses the handlebar on the top of the front sliding seat.

Each set of rear wheel positioning installation components includes two rear sliders and a rear sliding seat. There is a rear sliding hole inside the rear crossbeam along the left and right horizontal directions. Equal rear guide holes, the width of the rear guide hole is smaller than the width of the rear sliding hole, the two rear sliders are slidably fitted in the rear sliding hole and are located directly under the left and right sides of the rear sliding seat, and the left and right sides of the rear sliding seat The side and the right side are respectively threaded with a rear slider through a rear sliding bolt passing through the rear guide hole. The top of the rear slider is fixed with a left vertical plate and a right vertical plate, and the lower part of the rear wheel rim of the bicycle is in contact with the rear slider. And between the left vertical board and the right vertical board, the left vertical board and the right vertical board are vertically arranged along the front and rear direction, the top of the left vertical board is hinged with the rear pressure plate through the rear pin, the right side of the rear pressure plate is located above the right vertical board, the right The vertical plate is provided with a manual locking mechanism that presses and positions the rear pressing plate downwards. The lower surface of the rear pressing plate is provided with left and right rubber blocks. Under the action of the manual locking mechanism, the rear pressing plate passes through the left rubber block and the right rubber block downwards The right rubber block presses against the inside of the rear rim.

The manual locking mechanism includes a locking screw, a handle rod, a U-shaped washer, a lower pin shaft and an upper pin shaft. In the middle of the upper part of the right vertical plate, there is a lower installation groove opened on the left side, the right side and the top part. The right side middle part of the rear pressure plate There are guide grooves open on the top, bottom and right side. The lower pin shaft passes through the lower installation groove along the front and rear direction and is connected to the rear pressure plate by rotation. The outer diameter of the lower pin shaft is larger than the outer diameter of the locking screw. The radial direction of the lower pin shaft passes through the lower pin shaft and is threadedly connected with the lower pin shaft. In the middle of the right end of the handle rod, there is an upper installation groove open on the bottom and the right side. The upper end of the locking screw is located in the upper installation groove. The pin shaft passes through the locking screw along the front and rear directions and is connected to the right end of the handle rod by rotation. The outer diameter of the upper pin shaft is smaller than that of the locking screw. The washer is transparent up and down and the right side is open. The upper mounting groove, the inner hole of the U-shaped washer, the guide groove and the lower mounting groove correspond to each other up and down. When the locking screw is in a vertical state, the locking screw is located in the upper mounting groove from top to bottom. , U-shaped washer, guide groove and the inside of the lower installation groove, the outer contour of the right end of the handle rod surrounds the center line of the upper pin shaft and presents a gradually increasing variable-diameter arc surface structure from the upper right side to the lower left side, U-shaped The top of the gasket is provided with an arc-shaped groove corresponding to the structure of the variable-diameter arc surface and press-fitted.

With the above technical scheme, the structure of the jaws at both ends of the front beam and the rear beam and the roof bar on the roof of the car is the prior art, and the specific structure will not be described in detail. The front beam and the rear beam are provided with sliding holes along the length direction. Guide groove, this structure not only ensures the necessary strength and rigidity of the beam, but also reduces the weight of the front beam and the rear beam. The most important thing is that the slider can be easily installed in the sliding hole on the top, so that all the components connected by the slider It can slide along the axial length of the sliding hole to adjust the positions of the front slide seat and the rear slide seat on the front cross beam and the rear cross beam respectively, and position and tighten the front slide bolt and the rear slide bolt respectively; the fastening bolt tightens the handlebar It is tightly clamped between the front slide seat and the front pressure plate and fastened together; the front pressure plate is hinged with the front slide seat through the front pin shaft, and the front pressure plate and the front slide seat are combined to form a clamp that matches the outer circle of the handlebar. Hold the cavity to realize the positioning of the handlebar. The two ends of the handlebar of each bicycle are respectively equipped with a left fixing piece and a right fixing piece of the handlebar, and the front pressure plate and the front sliding seat clamp the handlebar as close as possible to the end of the handlebar to lengthen the positioning span and enhance positioning stability.

The connecting structure and sliding positioning principle between the rear sliding bolt, the rear slider and the rear sliding seat are the same as those of the front sliding bolt, the front sliding block and the front sliding seat. The cavity at the bottom of the rear rim is formed between the left vertical plate and the right vertical plate. Turn the rear pressure plate to the right to pass through the spokes of the rear rim, and the guide groove on the right side of the rear pressure plate is up and down with the lower installation groove on the right vertical plate. Correspondingly, hold the pin below the handle rod as the rotating shaft and rotate upwards. When the locking screw rotates to a vertical state, the right end of the handle rod is above the U-shaped washer, and the other hand presses down on the rear pressure plate, and then rotates the handle rod to drive the locking screw to rotate. , because the locking screw is threadedly connected with the lower pin shaft, the rotation of the locking screw will make the right end of the handle bar move downward. Turn to the left to make the lower left part of the handle rod contact the upper surface of the pressing plate, because the outer contour of the right end of the handle rod surrounds the center line of the upper pin shaft, forming a gradually increasing diameter-reducing arc from the upper right part to the lower left part Surface structure, as the handle bar turns to the left, the outer contour of the right end of the handle bar will gradually press the rear pressure plate through the U-shaped washer, and the two left rubber blocks and right rubber blocks set on the lower surface of the rear pressure plate will be tightly pressed. The inner side of the rear rim fixes the rear rim firmly.

The top of the U-shaped gasket is provided with an arc-shaped groove corresponding to the structure of the variable-diameter arc surface and press-fitted. This structure can ensure that the vibration of the car when driving on a rough road will not cause the locking stud to move to the right. U-shaped washer, good safety and reliability.

When dismounting the bicycle from the roof of the car in the present invention, the above-mentioned operation process is reversely operated, and the front pressing plate and the rear pressing plate are opened.

This vehicle-mounted bicycle top rack fully considers the characteristics of the car's movement process. The design of the vehicle-mounted bicycle rack is integrated with the design of the vehicle-mounted luggage rack. After the bicycle is turned upside down, the bicycle is locked by the joint positioning of the handlebar and the rear wheel rim. Its main advantages yes:

(1) The positioning is reliable. The positioning point not only includes the inner side of the rear wheel rim which is self-locking and easy to control, but more importantly, the handlebar positioning installation component is installed in the left and right directions where it is easy to dump sideways. Therefore, the positioning clamping point is at The span in the left and right directions is about 10 times that of the traditional one, and the positioning point of the handlebar positioning installation component can be adjusted according to the length of the handlebar, so the application range is wide. And two bicycles can be fixed on the roof.

(2) The bicycle is installed upside down, and the center of gravity is greatly reduced. The distance between the center of gravity and the bottom surface of the installation is about 210mm. Compared with the traditional upright loading method of bicycles, the center of gravity is lowered by about 280mm, ensuring the stability of the vehicle when driving at high speed and turning.

(3) Only one person can complete the positioning and clamping of the entire bicycle. It is easy to use, does not need to disassemble the wheels, and can be installed without damage, which is convenient for arranging multiple bicycles.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is the enlarged view of place A in Fig. 1;

Fig. 5 is the right side view of one group of rear wheel alignment mounting assemblies in Fig. 3;

Fig. 6 is an enlarged view at B in Fig. 5 .

Detailed ways

As shown in Figures 1 to 6, the vehicle-mounted bicycle roof frame of the present invention includes a front crossbeam 1 and a rear crossbeam 2 that are arranged along the left and right horizontal directions, and the lower parts of the two ends of the front crossbeam 1 and the rear crossbeam 2 are all provided with fastening connections. The claws 3 on the two roof bars on the top of the car, the front beam 1 is slid along the left and right horizontal directions and is provided with two groups of handlebar positioning installation assemblies 4 for fixing the handlebar 19 of the bicycle 7, and the rear beam 2 is arranged along the left and right sides. There are two groups of rear wheel positioning installation assemblies 6 for fixing the rear wheel rim 5 of the bicycle 7 by sliding in the horizontal direction. An inverted bicycle 7 is installed in positioning, and a group of handlebar positioning mounting assemblies 4 on the right side are used in cooperation with a group of rear wheel positioning mounting assemblies 6 on the right side for positioning and installing another inverted bicycle 7.

Each group of handlebar positioning installation assembly 4 comprises handlebar left side fixing part 8 and handlebar right side fixing part 9 with the same structure; handlebar left side fixing part 8 comprises two front sliders 10 and a front slide seat 11, front There is a front sliding hole 12 inside the crossbeam 1 along the left and right horizontal direction, and the top of the front crossbeam 1 is provided with a front guide hole 13 which communicates with the front slide hole 12 and is equal in length to the front slide hole 12. The width of the front guide hole 13 is smaller than that of the front slide hole 12. The width of the front sliding seat 11 is respectively provided with a mounting plate 14 on the left and right sides, and the two front sliding blocks 10 are all slidably fitted in the front sliding holes 12 and correspondingly located directly below a mounting plate 14, each of which is installed Plates 14 are all threaded with a front slider 10 through a front sliding bolt 15 passing through the front guide hole 13, and the top of the front slide seat 11 is hinged with a front pressure plate 17 along the rear side by a front pin shaft 16, and the front side of the front pressure plate 17 and The front side of the top of the front slide 11 is connected by a fastening bolt 18, and a cylindrical clamping cavity is provided between the top of the front slide 11 and the lower surface of the front pressure plate 17 along the left and right direction, and the left side of the handlebar 19 Stretch into the clamping cavity, under the action of the fastening bolt 18, the front pressing plate 17 compresses the handlebar 19 on the top of the front sliding seat 11.

Each group of rear wheel alignment installation assembly 6 all comprises two rear slide blocks 20 and a rear slide seat 21, rear beam 2 inside is provided with a rear slide hole 22 along the left and right horizontal direction, and rear beam 2 top is provided with rear slide hole 22 The rear guide hole 23 is connected and has the same length as the rear sliding hole 22. The width of the rear guide hole 23 is smaller than the width of the rear sliding hole 22. The two rear sliders 20 are slidably fitted in the rear sliding hole 22 and correspondingly located on the rear sliding seat. Right below the left side and right side of 21, the left side and the right side of the rear sliding seat 21 are respectively threaded with a rear sliding block 20 through a rear sliding bolt 24 passing through the rear guide hole 23, and the top of the rear sliding seat 21 is fixedly provided with Left vertical plate 25 and right vertical plate 26, the rear rim 5 bottoms of bicycle 7 contact with rear slide seat 21 and are positioned between left vertical plate 25 and right vertical plate 26, left vertical plate 25 and right vertical plate 26 are all along front and back The direction is vertically arranged, and the top of the left vertical plate 25 is hinged with a rear pressing plate 28 through the rear pin shaft 27, and the right side of the rear pressing plate 28 is located above the right vertical plate 26, and the right vertical plate 26 is provided with a rear pressing plate 28 that is pressed down and positioned. Manual locking mechanism 29, left rubber block 30 and right rubber block 31 are arranged on the lower surface of rear pressing plate 28, under the effect of manual locking mechanism 29, rear pressing plate 28 presses rear wheel through left rubber block 30 and right rubber block 31 downwards Inside of circle 5.

The manual locking mechanism 29 comprises a locking screw rod 32, a handle bar 33, a U-shaped washer 34, a lower pin 35 and an upper pin 36, and the middle of the upper end of the right vertical plate 26 is provided with a lower installation with left, right and top openings. Slot, the middle part of the right side of the rear pressing plate 28 is provided with a guide groove that is open on the top, the bottom and the right side. The lower pin shaft 35 passes through the lower installation groove along the front and rear direction and is connected to the rear pressing plate 28 in rotation. The outer pin shaft 35 The diameter is greater than the outer diameter of the locking screw rod 32, the locking screw rod 32 passes through the lower pin shaft 35 along the radial direction of the lower pin shaft 35 and is threadedly connected with the lower pin shaft 35, and the middle of the right end of the handle bar 33 is provided with a bottom and a right side. The upper mounting groove of the opening, the upper end of the locking screw 32 is located in the upper mounting groove, the upper pin shaft 36 passes through the locking screw rod 32 along the front and rear direction and is connected to the right end of the handle bar 33 by rotation, the outer diameter of the upper pin shaft 36 is smaller than the locking screw rod 32 The outer diameter of the U-shaped washer 34 is fixedly connected to the upper surface of the rear platen 28 and is located directly above the guide groove. The U-shaped washer 34 is transparent up and down and the right side is open. The groove and the lower mounting groove correspond up and down in turn. When the locking screw 32 is in a vertical state, the locking screw 32 is located in the upper mounting groove, the U-shaped washer 34, the guide groove and the lower mounting groove from top to bottom. The right end of the handle bar 33 The outer contour of the upper pin shaft 36 surrounds the center line of the upper pin shaft 36, forming a tapered arc surface structure 37 that gradually increases from the upper right side to the lower left side. Arc groove 38 for press fit.

The structure of the claws 3 at the lower parts of the two ends of the front beam 1 and the rear beam 2 and the roof bar on the top of the car are prior art, and the specific structure will not be repeated. The front beam 1 and the rear beam 2 are provided with slide holes and Guide groove, this structure can not only ensure the necessary strength and rigidity of the beam, but also reduce the weight of the front beam 1 and the rear beam 2, the most important thing is that the slider can be easily installed in the sliding hole on the top, so that all the beams are connected through the slider The components can slide along the axial length direction of the sliding hole to adjust the positions of the front sliding seat 11 and the rear sliding seat 21 respectively on the front crossbeam 1 and the rear crossbeam 2, and the front sliding bolts 15 and the rear sliding bolts 24 are respectively positioned and fastened The fastening bolt 18 clamps the handlebar 19 tightly between the front slide 11 and the front pressure plate 17 and fastens them together; the front pressure plate 17 is hinged with the front slide 11 through the front pin 16, and the front pressure plate 17 and the front The sliding seats 11 are combined to form a clamping cavity matched with the outer circle of the handlebar 19 to realize the positioning of the handlebar 19. The two ends of the handlebar 19 of every bicycle 7 are respectively equipped with a left side fixing part and a handlebar right side fixing part 9, and the front pressure plate 17 and the front slide seat 11 clamp the handlebar 19 as the position is as close as possible to the handlebar 19 ends , to lengthen the positioning span and enhance positioning stability.

The connection structure between the rear sliding bolt 24, the rear sliding block 20 and the rear sliding seat 21 and the slide positioning principle are the same as those of the front sliding bolt 15, the front sliding block 10 and the front sliding seat 11. The cavity at the bottom of the rear wheel rim 5 is formed between the left vertical plate 25 and the right vertical plate 26, and the rear pressing plate 28 is rotated to the right to pass through the spokes of the rear wheel rim 5, and the guide groove on the right side of the rear pressing plate 28 and the right vertical plate The lower installation groove on the 26 corresponds up and down, and the pin shaft 35 below the handle bar 33 rotates upwards as the rotating shaft. When the locking screw 32 rotates to a vertical state, the right end of the handle bar 33 is located above the U-shaped washer 34, and the other hand is down. Press the rear pressing plate 28, then rotate the handle bar 33 to drive the lock screw 32 to rotate, because the lock screw 32 is threadedly connected with the lower pin shaft 35, the rotation of the lock screw 32 will make the right end of the handle bar 33 move downward, when the handle bar 33 When the right end is in contact with the U-shaped washer 34, release the hand that presses the rear pressing plate 28, and turn the handle bar 33 to the left, so that the lower left side of the handle bar 33 is in contact with the upper surface of the pressing plate. Outer contour surrounds the center line of upper pin shaft 36 from the upper part on the right side to the lower part on the left side to form a tapered arcuate surface structure 37 that gradually increases. Can press back platen 28 gradually by U-shaped washer 34, and two left rubber pieces 30 and right rubber piece 31 that back platen 28 lower surfaces are provided with just press the inboard of rear wheel rim 5 tightly, and rear wheel rim 5 is fixed firmly.

The top of the U-shaped washer 34 is provided with an arc-shaped groove 38 corresponding to the variable-diameter arc surface structure 37 and press-fitted. Right movement breaks away from U-shaped washer 34, plays good safety and reliability.

When dismounting bicycle 7 from automobile roof among the present invention, reverse operation above-mentioned operation process, front pressing plate 17 and rear pressing plate 28 are lifted and get final product.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention belong to the protection of the technical solution of the present invention. scope.

Claims (1)

1. The vehicle-mounted bicycle roof frame includes a front beam and a rear beam arranged along the left and right horizontal directions. The lower parts of the two ends of the front beam and the rear beam are provided with claws that are fastened to the two roof bars on the roof of the car. It is characterized in that two sets of handlebar positioning installation components for fixing the handlebars of the bicycle are arranged on the front beam along the left and right horizontal directions, and two sets of rear rims for fixing the rear wheel rim of the bicycle are arranged on the rear cross beam along the left and right horizontal directions. Wheel alignment installation assembly, a group of handlebar alignment installation assemblies on the left side are used in conjunction with a group of rear wheel alignment installation assemblies on the left side to locate and install an inverted bicycle, and a set of handlebar alignment installation assemblies on the right side are used in conjunction with the right A group of rear wheel positioning installation components on the side are used to position and install another inverted bicycle; Each set of handlebar positioning and installation components includes a handlebar left fixing piece and a handlebar right fixing piece with the same structure; the handlebar left fixing piece includes two front sliders and a front slider, and the inside of the front cross member is along the left and right horizontal direction There is a front slide hole, and the top of the front cross beam is provided with a front guide hole which is connected with the front slide hole and has the same length as the front slide hole. The width of the front guide hole is smaller than the width of the front slide hole. There is a mounting plate, and the two front sliders are slidably fitted in the front sliding holes and correspondingly located directly under one mounting plate. Each mounting plate is correspondingly threaded with a front sliding block through a front sliding bolt passing through the front guide hole. The top of the front sliding seat is hinged with the front pressure plate through the front pin shaft along the rear side. The front side of the front pressing plate and the front side of the top of the front sliding seat are connected by a fastening bolt. There is a cylindrical clamping cavity in the left and right directions, and the left side of the handlebar extends into the clamping cavity. Under the action of fastening bolts, the front pressure plate presses the handlebar on the top of the front slide seat; Each set of rear wheel positioning installation components includes two rear sliders and a rear sliding seat. There is a rear sliding hole inside the rear crossbeam along the left and right horizontal directions. Equal rear guide holes, the width of the rear guide hole is smaller than the width of the rear sliding hole, the two rear sliders are slidably fitted in the rear sliding hole and are located directly under the left and right sides of the rear sliding seat, and the left and right sides of the rear sliding seat The side and the right side are respectively threaded with a rear slider through a rear sliding bolt passing through the rear guide hole. The top of the rear slider is fixed with a left vertical plate and a right vertical plate, and the lower part of the rear wheel rim of the bicycle is in contact with the rear slider. And between the left vertical board and the right vertical board, the left vertical board and the right vertical board are vertically arranged along the front and rear direction, the top of the left vertical board is hinged with the rear pressure plate through the rear pin, the right side of the rear pressure plate is located above the right vertical board, the right The vertical plate is provided with a manual locking mechanism that presses and positions the rear pressing plate downwards. The lower surface of the rear pressing plate is provided with left and right rubber blocks. Under the action of the manual locking mechanism, the rear pressing plate passes through the left rubber block and the right rubber block downwards The right rubber block presses the inner side of the rear rim; The manual locking mechanism includes a locking screw, a handle rod, a U-shaped washer, a lower pin shaft and an upper pin shaft. In the middle of the upper part of the right vertical plate, there is a lower installation groove opened on the left side, the right side and the top part. The right side middle part of the rear pressure plate There are guide grooves open on the top, bottom and right side. The lower pin shaft passes through the lower installation groove along the front and rear direction and is connected to the rear pressure plate by rotation. The outer diameter of the lower pin shaft is larger than the outer diameter of the locking screw. The radial direction of the lower pin shaft passes through the lower pin shaft and is threadedly connected with the lower pin shaft. In the middle of the right end of the handle rod, there is an upper installation groove open on the bottom and the right side. The upper end of the locking screw is located in the upper installation groove. The pin shaft passes through the locking screw along the front and rear directions and is connected to the right end of the handle rod by rotation. The outer diameter of the upper pin shaft is smaller than that of the locking screw. The washer is transparent up and down and the right side is open. The upper mounting groove, the inner hole of the U-shaped washer, the guide groove and the lower mounting groove correspond to each other up and down. When the locking screw is in a vertical state, the locking screw is located in the upper mounting groove from top to bottom. , U-shaped washer, guide groove and the inside of the lower installation groove, the outer contour of the right end of the handle rod surrounds the center line of the upper pin shaft and presents a gradually increasing variable-diameter arc surface structure from the upper right side to the lower left side, U-shaped The top of the gasket is provided with an arc-shaped groove corresponding to the structure of the variable-diameter arc surface and press-fitted.

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