CN105882794A - Bicycle collecting and placing structure for bicycle garage - Google Patents

Abstract

The invention discloses a bicycle collecting and placing structure for a bicycle garage, aiming to provide a bicycle collecting and placing structure by which bicycles on parking stands can be located. By the bicycle collecting and placing structure, the problem of incapability of taking the bicycles out or even damage to the bicycles in case of failure of clamping and locating mechanisms when the clamping and locating mechanisms are used for locating the bicycles in the prior art can be solved effectively. The bicycle collecting and placing structure comprises a three-dimensional frame and a parking stand arranged on the three-dimensional frame. The parking stand is provided with a limiting sliding groove and a supporting and limiting trigger mechanism. The front end of the limiting sliding groove is a wheel opening for allowing bicycle wheels to enter. The supporting and limiting trigger mechanism comprises a trigger locating support and a trigger switch. The trigger locating support is arranged on the parking stand rotationally through a first horizontal rotation shaft, and the trigger switch is arranged on the parking stand. The first horizontal rotation shaft is perpendicular to the length direction of the limiting sliding groove. The trigger locating support comprises a liming fork positioned above the limiting sliding groove, and an opening of the limiting fork faces the wheel opening.

Description

A bicycle storage structure for a bicycle garage

technical field

The invention relates to a bicycle storage, in particular to a bicycle storage structure for parking bicycles in the bicycle storage.

Background technique

Most of the traditional bicycle storages are above-ground carports, which occupy a large area and have a small number of cars. In order to increase the parking capacity of bicycle storage within a limited occupied area, three-dimensional bicycle storage came into being. The three-dimensional bicycle garage includes multi-layer parking racks for parking bicycles, but the current parking racks are usually provided with chutes on the parking racks and are used to clamp and fix the bicycle. When the bicycle wheels are in place, the bicycle is fixed by the clamping and positioning mechanism. Although this parking rack of the current three-dimensional bicycle garage can fix the bicycle, the clamping and positioning mechanism of the parking rack often needs to have power equipment (such as a motor, a cylinder, etc.) to realize the clamping action, which makes the current three-dimensional The following problems often occur in the bicycle storage process: when the clamping and positioning mechanism fails, the manipulator cannot take out the bicycle, and even the problem that the manipulator or the clamping and positioning mechanism damages the bicycle occurs.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a bicycle that can not only realize the positioning of the bicycle on the parking rack in the bicycle garage, but also can effectively solve the problem of using the clamping and positioning mechanism to locate the bicycle in the prior art. Positioning, when the clamping and positioning mechanism fails, the bicycle cannot be taken out, and even the bicycle is damaged. The bicycle storage structure of the bicycle garage.

Technical scheme of the present invention is:

A bicycle storage structure for a bicycle garage, comprising a three-dimensional frame and a parking frame arranged on the three-dimensional frame, the parking frame is provided with a limit chute and a support limit trigger mechanism, and the front end of the limit chute is for a The wheel opening where the bicycle wheel enters, the support limit trigger mechanism includes a trigger positioning bracket rotatably arranged on the parking frame and a trigger switch arranged on the parking frame through the first horizontal rotating shaft, the first horizontal rotating shaft and The length direction of the limit chute is vertical, and the trigger positioning bracket includes a limit fork located above the limit chute, and the fork of the limit fork faces the wheel opening, and the parking frame is provided with a trigger for limiting the trigger positioning. The limit fork of the bracket is the first limit piece that rotates towards the direction of the wheel opening, and the trigger positioning bracket is against the first limit piece; the parking frame is also provided with a limit fork that is used to limit the trigger positioning bracket to move away from the wheel. The second limiter for rotation in the opening direction.

The structure of this scheme can not only realize the positioning of the bicycles on the parking rack in the bicycle garage, but also effectively solve the problem of using the clamping and positioning mechanism to locate the bicycle in the prior art. When the clamping and positioning mechanism breaks down, the bicycle cannot be taken out. , and even the problem of bicycle damage.

Preferably, the trigger positioning bracket is provided with a trigger weight plate, the first limiter and the second limiter are located below the first horizontal rotating shaft, and the first limiter and the wheel opening are located at the trigger balance plate. On opposite sides, the second limiter and the wheel opening are located on the same side of the trigger weight plate.

Preferably, the trigger switch and the second limiter are located on the same side of the trigger weight plate.

As a preference, a mounting frame is provided on the parking frame, and the second limiting member includes a bolt hole arranged on the mounting frame and a limiting bolt arranged in the bolt hole, and the lengthwise direction of the limiting bolt and the limiting chute is parallel. In this solution, the rotation angle of the trigger positioning bracket can be adjusted by adjusting the alignment of the limit bolt.

Preferably, the parking frame is provided with a rotating shaft seat, the first horizontal rotating shaft is arranged on the rotating shaft seat, and the first limiting member is a limiting block arranged on the rotating shaft seat.

Preferably, the limit fork is V-shaped. The position-limiting fork of this solution is beneficial to coordinate with the position-limiting chute to position the bicycle, and can realize the positioning of bicycles with different wheel diameters.

Preferably, the cross section of the limit slide groove is V-shaped. The limit chute of this scheme is beneficial to coordinate with the limit fork to locate the bicycle.

Preferably, it also includes an auxiliary bicycle positioning device, the bicycle auxiliary positioning device includes a trigger device arranged on the parking rack, a positioning execution device arranged above the parking rack and a lever mechanism located below the parking rack, the trigger device includes a limit The gap on the bottom surface of the bit chute, the vertical guide sleeve arranged below the gap, the vertical slide bar that can be slidably arranged in the vertical guide sleeve and the trigger plate that is arranged on the upper end of the vertical slide bar. The said gap is close to the wheel opening, the vertical guide sleeve is connected with the parking frame through the connecting rod, and the outer surface of the vertical slide rod is provided with a slide bar limit stopper under the vertical guide sleeve. A first compression spring is provided on the vertical slide bar and between the vertical guide sleeve and the trigger plate; the positioning execution device includes a first vertical cylinder and a second Vertical cylinder, the first piston arranged in the first vertical cylinder, the first vertical connecting rod connected with the first piston, the second piston arranged in the second vertical cylinder and the second The second vertical connecting rod connected to the piston, the second compression spring is arranged in the first vertical cylinder and between the first piston and the top surface of the first vertical cylinder, the first vertical cylinder The lower end surface of the first vertical cylinder body is provided with a first through-rod through hole communicating with the inner cavity of the first vertical cylinder, the first vertical connecting rod passes through the first through-rod through hole, and the upper end of the first vertical cylinder body is provided with a The first joint communicating with the inner cavity of the first vertical cylinder, the lower end surface of the second vertical cylinder is provided with a second rod through hole communicating with the inner cavity of the second vertical cylinder, The straight connecting rod passes through the second rod through hole, the lower end of the second vertical connecting rod is provided with a seat pressure plate, and the upper end of the second vertical cylinder is provided with a second vertical cylinder communicating with the second vertical cylinder cavity. joint, the first joint and the second joint are connected through an oil guide pipe, and the lever mechanism includes a lever arranged below the parking frame through a second horizontal rotating shaft, a first sliding sleeve slidably arranged on the lever, and The second sliding sleeve, the first sliding sleeve and the second sliding sleeve are located on opposite sides of the second horizontal rotating shaft, the lower end of the vertical sliding rod is hingedly connected with the first sliding sleeve, and the lower end of the first vertical connecting rod It is hingedly connected with the second sliding sleeve.

Preferably, the seat pressure plate is perpendicular to the second vertical connecting rod, and the lower surface of the vehicle seat pressure plate is provided with a rubber pressing block.

Preferably, the inner diameter of the first vertical cylinder is larger than the inner diameter of the second vertical cylinder.

The beneficial effects of the present invention are: not only can realize the positioning of the bicycle on the parking rack in the bicycle garage, but also can effectively solve the problem of using the clamping and positioning mechanism to locate the bicycle in the prior art, when the clamping and positioning mechanism breaks down, Cause bicycle cannot take out, even the problem that bicycle damage occurs.

Description of drawings

Fig. 1 is a structural schematic diagram of the bicycle storage structure of the bicycle garage according to the first embodiment of the present invention.

Fig. 2 is a schematic diagram of the cross-sectional structure at A-A in Fig. 1 .

Fig. 3 is a partial enlarged view of B in Fig. 1 .

FIG. 4 is a partial view from the top view of FIG. 1 .

Fig. 5 is a schematic cross-sectional structure diagram at C-C in Fig. 4 .

Fig. 6 is a structural schematic diagram of the bicycle storage structure of the bicycle garage according to the first embodiment of the present invention during practical application.

FIG. 7 is a partially enlarged view at D in FIG. 6 .

Fig. 8 is a structural schematic diagram of the bicycle storage structure of the bicycle storage according to the second embodiment of the present invention.

FIG. 9 is a partial enlarged view at E in FIG. 8 .

Fig. 10 is a structural schematic view of the bicycle storage structure of the bicycle garage according to the second embodiment of the present invention during practical application.

Among the figure: three-dimensional frame 1, parking rack 2, limit chute 21, wheel opening 22, grooved steel frame 23, support swash plate 24, support limit trigger mechanism 3, trigger positioning bracket 31, limit fork 31a, Trigger switch 32, rotating shaft seat 33, first horizontal rotating shaft 34, U-shaped connecting frame 35, first limiting member 36, triggering weight plate 37, second limiting member 38, mounting frame 39, bicycle 4, triggering device 5 , trigger plate 51, give way gap 52, vertical slide bar 53, first compression spring 54, vertical guide sleeve 55, slide bar limit block 56, lever mechanism 6, second horizontal rotating shaft 61, lever 62, the first One sliding sleeve 63, the second sliding sleeve 64, the positioning actuator 7, the first joint 71, the second compression spring 72, the first vertical cylinder 73, the first piston 74, the first vertical connecting rod 75, the oil guide Pipeline 76 , second joint 77 , second piston 78 , second vertical cylinder 79 , second vertical connecting rod 710 , seat pressing plate 711 , rubber pressing block 712 .

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Embodiment 1: As shown in Fig. 1 and Fig. 2, a bicycle storage structure of a bicycle garage includes a three-dimensional frame 1 and a parking frame 2 arranged on the three-dimensional frame. The parking rack is set horizontally. The parking frame includes a channel-shaped steel frame 23 with an opening facing upwards and two supporting inclined plates 24 arranged in the channel-shaped steel frame. The channel-shaped steel frame is composed of two symmetrically arranged angle steels. The two supporting inclined plates are arranged symmetrically.

The parking frame is provided with a limit chute 21 and a support limit trigger mechanism 3 . The front end of the limit chute is the wheel opening 22 for the bicycle wheel to enter. The limit chute is formed between the two support slant plates and the bottom surface of the channel-shaped steel frame. The cross section of the limiting chute is V-shaped.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5, and Fig. 7, the support limit trigger mechanism includes a trigger positioning bracket 31 that is rotatably arranged on the parking frame through a first horizontal rotating shaft 34 and a trigger positioning bracket that is arranged on the parking frame. Trigger switch 32 . The trigger positioning bracket is provided with a U-shaped connecting frame 35, and the U-shaped connecting frame is arranged on the parking frame through the rotation of the first horizontal rotating shaft. The trigger switch is a travel switch or a pressure switch (ie a pressure sensor) or a photoelectric sensor, and the trigger switch in this embodiment is a travel switch. The parking frame is provided with a rotating shaft seat 33, and the rotating shaft seat is located below the parking frame. The first horizontal rotating shaft is rotatably arranged on the rotating shaft seat. The first horizontal rotating shaft is perpendicular to the length direction of the limiting chute. The trigger positioning bracket includes a limit fork 31a located above the limit chute, and the fork of the limit fork is open towards the wheel opening. The limit fork is V-shaped. A trigger counterweight plate 37 is arranged on the trigger positioning bracket. The trigger weight plate is located under the parking rack.

The parking rack is provided with a first limiting member 36 for limiting the rotation of the limiting fork triggering the positioning bracket to the direction of the wheel opening. The first limiting member is a limiting block arranged on the rotating shaft seat. The first limiting member is located below the first horizontal rotating shaft. The first limiting member and the wheel opening are located on opposite sides of the trigger weight plate. The trigger positioning bracket abuts against the first limiting member, and the trigger positioning bracket in this embodiment rotates around the first horizontal rotation axis under the action of gravity of the trigger weight plate and abuts against the first limiting member.

The parking rack is also provided with a second stopper 38 for limiting the stopper fork that triggers the positioning bracket to rotate away from the wheel opening. The second limiting member is located below the first horizontal rotating shaft. The second limiter is located on the same side of the trigger weight plate as the wheel opening. The trigger switch and the second limiter are located on the same side of the trigger weight plate. The parking stand is provided with mounting frame 39. The second limiting member includes a bolt hole arranged on the installation frame and a limiting bolt arranged in the bolt hole, and the limiting bolt is parallel to the length direction of the limiting chute. Lock nuts are also arranged on the limit bolts. The trigger switch is mounted on the mounting bracket.

As shown in FIG. 6 and FIG. 7 , when the trigger positioning bracket abuts against the second limiting member, the trigger switch is triggered by the trigger positioning bracket.

The specific use process of the bicycle storage structure of the bicycle storage of the present embodiment is as follows:

As shown in Fig. 6 and Fig. 7, the bicycle 4 is moved into the parking frame along the limit chute by the manipulator. The horizontal rotating shaft rotates until the trigger weight plate abuts against the second limiter.

When the trigger positioning bracket abuts against the second limiter, the trigger switch is triggered by the trigger positioning bracket, so that the trigger switch sends a signal that the bicycle is put into storage, and the manipulator stops moving the bicycle; then, the manipulator releases the bicycle. After the manipulator releases the bicycle, the bicycle is positioned on the parking frame through the limit chute and the limit fork.

The process of picking up the bicycle is as follows: hold the bicycle with the manipulator, and move the bicycle out along the limit chute. There will be no problem that the manipulator cannot take out the bicycle, or even the manipulator or the clamping and positioning mechanism will damage the bicycle; therefore, it can be effectively The invention solves the problem that in the prior art, the clamping and positioning mechanism is used to position the bicycle, and when the clamping and positioning mechanism breaks down, the bicycle cannot be taken out, and even the bicycle is damaged.

Embodiment 2, the remaining structure of this embodiment is with reference to embodiment 1, and its difference is:

As shown in Fig. 8 and Fig. 9, a bicycle storage structure of a bicycle storage also includes an auxiliary bicycle positioning device. The bicycle auxiliary positioning device includes a trigger device 5 arranged on the parking frame, a positioning execution device 7 arranged above the parking frame and a lever mechanism 6 located below the parking frame.

The trigger device comprises a gap 52 on the bottom surface of the limit chute, a vertical guide sleeve 55 arranged below the gap, a vertical slide bar 53 slidably arranged in the vertical guide sleeve, and a vertical slide bar arranged on the vertical slide. The trigger plate 51 on the rod upper end. Give way to notches closer to the wheel openings. The vertical guide sleeve is connected with the parking frame through a connecting rod. A slide bar limit block 56 is provided on the outer surface of the vertical slide bar and below the vertical guide sleeve. A first compression spring 54 is arranged on the vertical slide bar and between the vertical guide sleeve and the trigger plate. When the sliding rod limit stopper abuts on the vertical guide sleeve, the trigger plate is located above the bottom surface of the limit chute.

The positioning execution device comprises a first vertical cylinder 73 and a second vertical cylinder 79 arranged on the three-dimensional frame and positioned above the parking frame, a first piston 74 arranged in the first vertical cylinder, and a first piston The connected first vertical connecting rod 75, the second piston 78 arranged in the second vertical cylinder and the second vertical connecting rod 710 connected with the second piston. The inner diameter of the first vertical cylinder is larger than the inner diameter of the second vertical cylinder. A second compression spring 72 is arranged in the first vertical cylinder and between the first piston and the top surface of the first vertical cylinder. The lower end surface of the first vertical cylinder is provided with a first through-rod through hole communicating with the inner cavity of the first vertical cylinder. The first vertical connecting rod passes through the first rod passing hole. The upper end of the first vertical cylinder is provided with a first joint 71 communicating with the inner cavity of the first vertical cylinder.

The second vertical cylinder is located above between the trigger positioning bracket and the wheel opening. The lower end surface of the second vertical cylinder body is provided with a second rod passing hole communicating with the inner chamber of the second vertical cylinder body. The second vertical connecting rod passes through the second passing rod through hole. The lower end of the second vertical link is provided with a seat pressure plate 711 . The vehicle seat pressing plate is perpendicular to the second vertical connecting rod, and the lower surface of the vehicle seat pressing plate is provided with a rubber pressing block 712 . The upper end of the second vertical cylinder is provided with a second joint 77 communicating with the inner cavity of the second vertical cylinder. The first joint and the second joint are connected through an oil guide pipe 76 . The first vertical cylinder above the first piston and the second vertical cylinder above the second piston are filled with oil.

The lever mechanism includes a lever 62 arranged below the parking frame through a second horizontal rotating shaft 61 , a first sliding sleeve 63 and a second sliding sleeve 64 slidably arranged on the lever. The first sliding sleeve and the second sliding sleeve are located on opposite sides of the second horizontal rotating shaft. The first sliding sleeve is close to the wheel opening, and the second sliding sleeve is away from the wheel opening. The lower end of the vertical slide bar is hingedly connected with the first sliding sleeve. The lower end of the first vertical connecting rod is hingedly connected with the second sliding sleeve.

The specific use process of the bicycle storage structure of the bicycle storage of the present embodiment is as follows:

First, the bicycle 4 is moved into the parking frame along the limit chute by the manipulator. In this process, the rear wheel of the bicycle will enter the limit fork and drive the trigger positioning bracket to rotate around the first horizontal axis through the limit fork until the trigger The weight plate leans against the second limiting member.

When the trigger positioning bracket abuts against the second limiter, the trigger switch is triggered by the trigger positioning bracket, so that the trigger switch sends a signal that the bicycle is put into storage, and the manipulator stops moving the bicycle; then, the manipulator releases the bicycle. After the manipulator releases the bicycle, the bicycle is positioned on the parking frame through the limit chute and the limit fork.

As shown in Fig. 8 and Fig. 10, when the bicycle is stored in place and the manipulator releases the bicycle, the front wheel of the bicycle will be located above the trigger plate, and now the trigger plate drives the vertical slide bar to move down under the gravity of the bicycle. During the downward movement of the vertical slide bar, the first vertical connecting rod and the first piston are lifted up by the lever mechanism. When the first piston is jacking up, the oil in the first vertical cylinder enters the second vertical cylinder through the oil guide pipe, so that the second piston, the second vertical connecting rod, the seat pressure plate and the The rubber pressing block moves down until the rubber pressing block is pressed tightly on the bicycle seat; thus the bicycle is stably and reliably positioned on the parking frame through the seat pressing plate, rubber pressing block, limit chute and limit fork. Avoid the bike from tipping over due to vibration.

The process of getting the bicycle of the present embodiment is as follows:

The front wheel of the bicycle is clamped by the manipulator, and the front wheel of the bicycle is lifted up. After the front wheel of the bicycle was lifted upwards, the trigger plate and the vertical slide bar moved upwards and reset under the action of the first compression spring. During the upward movement of the trigger plate and the vertical sliding rod, the first piston is moved downward through the action of the lever mechanism and the second compression spring, so that the oil in the second vertical cylinder enters the first cylinder through the oil guide pipe. The vertical cylinder block moves up the second piston, the second vertical connecting rod, the seat pressing plate and the rubber pressing block, and the rubber pressing block is separated from the vehicle seat of the bicycle.

Then, the bicycle can be moved out along the limit chute, and there will be no problems that the manipulator cannot take out the bicycle, or even the manipulator or the clamping and positioning mechanism will damage the bicycle.

Claims (10)

1. A bicycle storage structure of a bicycle garage, comprising a three-dimensional frame and a parking frame arranged on the three-dimensional frame, characterized in that, the parking frame is provided with a limit chute and a support limit trigger mechanism, and the limit The front end of the chute is a wheel opening for the bicycle wheels to enter, and the support limit trigger mechanism includes a trigger positioning bracket that is rotatably arranged on the parking frame and a trigger switch that is arranged on the parking frame through the first horizontal rotating shaft. The first horizontal rotating shaft is perpendicular to the length direction of the limit chute, the trigger positioning bracket includes a limit fork located above the limit chute, and the fork of the limit fork faces the wheel opening, The parking frame is provided with a first limit piece for limiting the rotation of the limit fork of the trigger positioning bracket to the direction of the wheel opening, and the trigger positioning bracket is abutted against the first limit piece; The second limiting member that limits the rotation of the limiting fork of the trigger positioning bracket to the direction away from the wheel opening. 2. The bicycle storage structure of a bicycle garage according to claim 1, wherein the triggering positioning bracket is provided with a triggering weight plate, and the first limiting member and the second limiting member are located at Below the first horizontal rotating shaft, the first limiter and the wheel opening are located on opposite sides of the trigger counterweight plate, and the second limiter and the wheel opening are located on the same side of the trigger counterweight plate. 3 . The bicycle storage structure of a bicycle garage according to claim 1 , wherein the trigger switch and the second limiter are located on the same side of the trigger weight plate. 4 . 4. The bicycle storage structure of a bicycle garage according to claim 1, 2 or 3, wherein a mounting frame is provided on the parking frame, and the second limiting member includes a The bolt hole and the limit bolt arranged in the bolt hole, and the limit bolt is parallel to the length direction of the limit chute. 5. The bicycle storage structure of a bicycle garage according to claim 1, 2 or 3, wherein a rotating shaft seat is provided on the parking frame, and the first horizontal rotating shaft is arranged on the rotating shaft seat, so that The first limiting member is a limiting block arranged on the rotating shaft seat. 6 . The bicycle storage structure of a bicycle garage according to claim 1 , 2 or 3 , wherein the spacer fork is V-shaped. 7 . 7. The bicycle storage structure of a bicycle garage according to claim 1, 2 or 3, wherein the cross-section of the limiting chute is V-shaped. 8. The bicycle storage structure of a bicycle garage according to claim 1, 2 or 3, characterized in that it also includes an auxiliary bicycle positioning device, and the bicycle auxiliary positioning device includes a trigger device arranged on the parking rack, The positioning actuator set above the parking frame and the lever mechanism below the parking frame, The triggering device comprises a gap on the bottom surface of the limit chute, a vertical guide sleeve arranged below the gap, a vertical slide bar slidably arranged in the vertical guide sleeve, and a vertical slide bar arranged on the vertical slide bar. The trigger plate at the upper end, the gap is close to the wheel opening, the vertical guide sleeve is connected with the parking frame through a connecting rod, and a slide bar is arranged on the outer surface of the vertical slide bar and is located below the vertical guide sleeve A limit stopper, a first compression spring is arranged on the vertical slide bar and between the vertical guide sleeve and the trigger plate; The positioning execution device includes a first vertical cylinder and a second vertical cylinder arranged on the three-dimensional frame and above the parking frame, a first piston arranged in the first vertical cylinder, and a first piston connected to the first piston. the connected first vertical connecting rod, the second piston arranged in the second vertical cylinder and the second vertical connecting rod connected with the second piston, In the first vertical cylinder and between the first piston and the top surface of the first vertical cylinder, a second compression spring is provided, and the lower end surface of the first vertical cylinder is provided with the first vertical cylinder. The first through-rod through hole connected to the internal cavity, the first vertical connecting rod passes through the first through-rod through hole, and the upper end of the first vertical cylinder is provided with a first joint, The lower end surface of the second vertical cylinder body is provided with a second through-rod through hole communicating with the inner cavity of the second vertical cylinder, the second vertical connecting rod passes through the second through-rod through-hole, and the second vertical rod passes through the second through-rod through hole. The lower end of the straight connecting rod is provided with a seat pressure plate, and the upper end of the second vertical cylinder is provided with a second joint communicating with the inner chamber of the second vertical cylinder, and the first joint and the second joint are connected through a guide. The oil pipeline is connected, The lever mechanism includes a lever arranged below the parking frame through a second horizontal rotating shaft, a first sliding sleeve and a second sliding sleeve slidably arranged on the lever, and the first sliding sleeve and the second sliding sleeve are located opposite to the second horizontal rotating shaft. On both sides, the lower end of the vertical sliding rod is hingedly connected to the first sliding sleeve, and the lower end of the first vertical connecting rod is hingedly connected to the second sliding sleeve. 9 . The bicycle storage structure of a bicycle garage according to claim 8 , wherein the seat pressure plate is perpendicular to the second vertical connecting rod, and a rubber pressure block is provided on the lower surface of the seat pressure plate. 10 . The bicycle storage structure of a bicycle garage according to claim 8 , wherein the inner diameter of the first vertical cylinder is larger than the inner diameter of the second vertical cylinder. 11 .