Double-Pedal Double-Wheel Truckle with Independent Braking and Releasing Functions

Abstract

A double-pedal double-wheel truckle with independent braking and releasing functions is a truckle for a precision instrument and comprises a body, a rotating & locking device, a truckle body device, a braking device and a bottom cover body. The body is provided for disposing a rotating & locking device, a truckle body device, a braking device and a bottom cover body. With the independent braking and releasing functions of the braking device of the body, the user can easily operate and stably block the rotating & locking device and the truckle body device. The bottom cover body is provided for preventing foreign matters from entering the truckle body device, so that the truckle can be locked from rotation. By such arrangements, it can achieve the objectives, such as easy operation, easy to distinguish braking state, stable braking, reducing noises, strengthening structure and safe usage, etc.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a truckle with braking and releasing functions, and more particularly to a truckle with independent braking and releasing functions suitable for a precision instrument, which utilizes a braking device to provide the user the functions, such as easy operation, easy to distinguish the braking state, stable braking, avoiding noises and safe usage, etc.

2. Description of the Prior Art

A conventional truckle structure disclosed in Taiwan Design Patent No. 339,043 is an improvement of a truckle structure. On the top of the truckle rack of this truckle structure is disposed a holding platform. A braking device is suspended from the front end of the holding platform. The holding platform includes opposite through holes in both side boards thereof, at least one pivot hole in the protruding ear at the front end of each side board, at least one fastening portion inside each side board adjacent to the protruding ear. The fastening portion includes a longitudinal end board forming on the inside surface of the side board adjacent to the protruding ear. The tip end of the longitudinal end board extends backward out of a side stopping board. A transverse engaging block is disposed in a region surrounded by the longitudinal end board and the side stopping board. In addition, a fastener is disposed on the side board.

The above conventional truckle structure has the following disadvantages:

1. Difficult to operate: the braking structure of the braking device is integrated with the releasing structure. By such a design, the braking operation and the releasing operation cannot be substantially achieved. Thereby, it cannot provide an easy operation and high safety;

2. Cost wasting: the braking device is suspended form the front end of the holding platform, and such a design is a two-segment design and is unlikely to be an integrated structure, so it is required to additionally manufacture the braking component after the holding platform is completed, thus increasing a manufacturing process and causing the material waste;

3. Difficult to manufacture: On the top of the truckle rack is disposed a holding platform. The holding platform includes opposite through holes in both side boards thereof, at least one pivot hole in the protruding ear at the front end of each side board, at least one fastening portion inside each side board adjacent to the protruding ear and a longitudinal end board forming on the inside surface of the side board adjacent to the protruding ear. The tip end of the longitudinal end board extends backward out of a side stopping board. In a region surrounded by the longitudinal end board and the side stopping board is disposed a transverse engaging block. The highly complicated side board is difficult to manufacture.

4. Truckle deformation: since the braking device of the holding platform directly presses against the truckle body and a pivot rotating position, such a braking action is likely to cause the deformation of the truckle body.

5. Easy damage: on the top of the truckle are disposed a holding platform and the side boards of the holding platform, etc, so the assembled truckle rack needs to support the structures of the holding platform, etc, thus improving the damage rate of the truckle rack.

6. Poor stability: the braking structure is integrated with the releasing structure of the braking device, by such a design, when in use, the user is likely to synchronously perform the braking action and the releasing action, thus causing the poor operational stability.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The present invention relates to a double-pedal double-wheel truckle with independent braking and releasing functions. The truckle is suitable for a precision instrument and comprises a body. The body is provided for disposing a rotating & locking device, a truckle body device and a braking device. The braking device is disposed in the middle of the rotating & locking device and the truckle body device. With the above integral structure, it can achieve the objectives of easy operation, easy to distinguish the braking state, stable braking, reducing noises, strengthening structure and safe usage, etc.

The present invention further relates to a double-pedal double-wheel truckle with independent braking and releasing functions. The truckle is suitable for a precision instrument and comprises a body. With the braking and releasing functions of a braking device of the body, the rotating & locking device and the truckle body device can be firmly positioned, and the user can easily distinguish the braking state, operate and stably block the truckle through the braking device, so as to keep the truckle suitable for the precision instrument in a safe locked state, thus achieving the objectives of easy operation, easy to distinguish the braking state, stable braking and safe usage, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a double-pedal double-wheel truckle with independent braking and releasing functions in accordance with the present invention;

FIG. 2 is an exploded view of the double-pedal double-wheel truckle with independent braking and releasing functions in accordance with the present invention;

FIG. 3 is a cross sectional view of the double-pedal double-wheel truckle with independent braking and releasing functions in accordance with the present invention;

FIG. 4 is a perspective view showing that the double-pedal double-wheel truckle with independent braking and releasing functions in accordance with the present invention is operated; and

FIG. 5 is a cross sectional view showing the double-pedal double-wheel truckle with independent braking and releasing functions in accordance with the present invention is operated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to FIGS. 1-5, a double-pedal double-wheel truckle A with independent braking and releasing functions in accordance with the present invention, which is suitable for a precision instrument, comprises a slide-shaped body 10 formed with a plurality of inserting-receiving configurations. The body 10 includes a rotating & locking device 20, a truckle body device 30, a braking device 40 and a bottom cover body 50. The braking device 40 is disposed between the rotating & locking device 20 and the truckle device 30 of the body 10. The bottom cover body 50 is disposed at one end of the rotating & locking device 20 and the truckle body device 30 for preventing foreign matters from entering inside. With the braking and releasing functions of the braking device 40 of the body 10, the user can easily operate and stably block the rotating & locking device 20 and the truckle body device 30. Additionally, the bottom cover body 50 is used to prevent foreign matters form entering inside, so that the truckle A can be stably actuated, safely moved or locked from rotation. By such arrangements, the present invention can achieve the objectives, such as easy operation, easy to distinguish braking state, stable braking, reducing noises, strengthening structure and safe usage, etc.

The body 10 is a slide-shaped body including a plurality of inserting-receiving configurations. One end of the body 10 is formed with a through round receiving portion 11 of a big diameter for holding the rotating & locking device 20. Adjacent to the receiving portion 11 is disposed a matching body 12 with opposite arc-shaped members. The matching body 12 includes a round receiving hole 120 and a plurality of round through holes 121A, 121B of a small diameter and a plurality of elongated fastening holes 122. The receiving hole 120 is provided for insertion of the truckle body device 30, and the holes 121A, 121B are provided for the insertion of the braking device 40. The fastening hole 122 is provided for the insertion of the bottom cover body 50.

The rotating and locking device 20 includes a stepped column-shaped inserting member 21, a disc-shaped hollow matching member 22, a round bearing member 23, at least more than one round hollow washer member 24, a disk-shaped multi-tooth fastening member 25 and a round hollow fixing member 26. One end of the inserting member 21 is fixed to the precision instrument, and the other smaller end of the inserting member 21 is inserted into the matching member 22, the bearing member 23, and the washer member 24. A free end of the inserting member 21 is disposed in the fastening member 25. The matching member 22 is covered outside the receiving portion 11 and includes an inserting portion 220. The inserting portion 220 is inserted through the center of the bearing member 23. The bearing member 23 is positioned in the receiving portion 11 and a round stepped washer member 24, and the other end of the washer member 24 is formed with the fastening member 25. The fastening member 25 includes a cross-shaped receiving hole 250 for receiving the inserting member 21, and a multi-tooth inside-concave fastening portion 251 for fastening with the braking device 40. The fixing member 26 is fixed to one end of the inserting member 21.

The truckle body device 30 includes at least more than one pair of round shield-shaped shell members 31, at least more than one pair of round wheel-shaped wheels 32, at least more than one pair of disc-shaped multi-level driven members 33, at least more than one pair of round bearing members 34 and a solid column-shaped middle shaft 36. The shell member 31 is vertically formed with at least more than one round protruding engaging portion 310 with a cross groove. The protruding engaging portion 310 is disposed in the driven member 33. Additionally, the wheel 32 is mounted on a rounding outer end of the driven member 33 for facilitating the wheel 32 freely rotating around the free end of the driven member 33. The driven member 33 includes a plurality of engaging holes 330 engaged with the protruding engaging portions 310 of the shell member 31, a plurality of tooth-shaped engaging portions 331 formed on an inner surface of the driven member 33, and a plurality of locking portions 332 formed around an outer periphery of a protruding flange around a central hole of the driven member 33. The engaging portions 331 and the locking portion 332 are provided for engaging with the baking device 40. In addition, the bearing member 34 is positioned outside the matching body 12 and in the hollow position of the driven member 33. The middle shaft 36 is inserted through the matching body 12 and the bearing member 34 for restricting the deviation of the bearing member 34.

The braking device 40 includes a mushroom-shaped releasing member 41, a L-shaped actuating member 42 and a flexuous chip-shaped releasing & stopping member 43. One end of the releasing member 41 is formed with a releasing portion 410 including a plurality of symmetrical parallel antiskid ribs for the user to step on without slippage, and the other end of the releasing member 41 is folded 90 degrees and formed with a through connecting hole 411 at the folded portion thereof for pivotally coupling the pivot shaft to the holes 121A of the matching body 12. Furthermore, the folded end of the releasing member 41 is pivotally linked to the actuating member 42 by a pivot shaft 412, and on the surface of the folded end of the releasing member 41 is formed a protruding stop portion 413. One end of the actuating member 42 includes a plurality of through coupling holes 420A, 420B, and the other end of the actuating member 42 includes an actuating portion 421 with a plurality of antiskid parallel ribs for the user to step on without slippage. The through coupling holes 420A and the through connecting hole 411 of the releasing member 41 are provided for the insertion of the pivot shaft 412. The through coupling hole 420B is pivotally fixed at one end of the releasing &stopping member 43 by a pivot shaft. A vertical stop portion 422 is formed between two coupling holes 420A.

The releasing & stopping member 43 is formed with two opposite ear-shaped matching portions 430 with a round hole. An arc-shaped elastic return member 431 is formed on an elastic sheet portion between the two opposite matching portions 430 and protrudes in an opposite direction to the matching portions 430. Two fastening portions 432 each of which being in the form of through hole formed by two opposite semi-circled portions are formed at both sides of the elastic sheet portion. Both sides of the elastic sheet portion extend in an opposite direction to the matching portions 430 to form two hook-shaped abutting engaging portions 433. The middle portion of the elastic sheet portion extends in an opposite direction to the matching portions 430 to form an abutting fastening portion 434. At the end of each of two sides of the elastic sheet portion is formed an abutting locking portion 435 which extends in an opposite direction to the matching portions 430.

A pivot shaft is inserted through matching portion 430 and the through coupling hole 420B of the actuating member 42, and the elastic return member 431 is disposed in the middle of the fastening portion 432 and supports against the internal end surface of the matching body 12. The fastening portion 432 is formed with the round through holes 121A, 121B of the matching body 12 for inserting a pivot rod. The abutting engaging portions 433, the abutting fastening portion 434 and the abutting locking portions 435 can be positioned against the fastening portion 251 of the fastening member 25 of the rotating & locking device 20 and the engaging portion 331 and the locking portion 332 of the driven member 33 of the truckle body device 30 by cooperating with the braking or releasing action of the releasing member 41 and the driven member 42.

The bottom cover body 50 is an integrated chip body with a fastening portion 51, which extends adjacent to the body 10. The fastening portion 51 is fastened to the fastening hole 122 of the body 10. By firmly fastening the fastening portion 51 of the bottom cover body 50 with the fastening hole 122 of the body 10, it can prevent the foreign matters from blocking the actuation of the truckle body device 30.

When the releasing member 41 is stepped downward, as shown in FIGS. 1-3, the releasing portion 410 of the releasing member 41 will be pressed against the matching body 12, and the actuating member 42 will rotate around the coupling holes 420B, making the actuating portion 421 tilt upward. At this moment, the abutting engaging portions 433, the abutting fastening portion 434 and the abutting locking portions 435 are disengaged from the engaging portions 331, the locking portion 332 and the fastening portion 251, so that the truckle body device 30 is in a brake-release state and free to rotate.

Further referring to FIGS. 4-5, when the user steps on the actuating member 42 of the braking device 40, and the actuating member 42 will rotate around the coupling holes 420B and will drive the releasing member 41 by the releasing &stopping member 43 to make the abutting engaging portion 433 of the releasing &stopping member 43 engage with the engaging portion 331 of the driven member 33 of the truckle body device 30, and make the abutting fastening portion 434 engage with the fastening portion 251 of the fastening member 25 of the rotating & locking device 20. Meanwhile, the abutting locking portion 435 will also be caused to engage with the locking portions 332. By such arrangements, the rotating & locking device 20 and the truckle body device 30 are maintained in a brake state in which the truckle body device 30 is locked from rotation. The releasing member 41 and the actuating member 42 of the braking device 40 are separated when in use, meanwhile, the stop portion 413 of the releasing member 41 and the stop portion 422 of the actuating member 42 are engaged with each other, thus facilitating the user distinguishing the braking state, safely operating and braking the braking device 40. Thereby, the truckle A can provide the functions such as an easy operation, easy to distinguish the braking state, a stable braking and a safe usage, etc, thus achieving the objectives of saving the material cost and shortening the manufacturing time.

With the above structures, the present invention can provide the following functions, such as:

1. Easy operation: when the user steps on the actuating member 42 of the braking device 40, the actuating member 42 linked with the releasing &stopping member 43 will drive the releasing member 41 to make the abutting engaging portion 433 of the releasing &stopping member 43 substantially engage with the engaging portion 331 of the driven member 33 of the truckle body device 30, and make the abutting fastening portion 434 be substantially fastened to the fastening portion 251 of the fastening member 25 of the rotating & locking device 20, meanwhile, the abutting locking portion 435 are caused to engage with the locking portions 332, so that the rotating & locking device 20 and the truckle body device 30 are maintained in a brake state in which the truckle body device 30 is locked from rotation. By such a design, the user can definitely operate the braking and releasing actions. Thereby, the present invention can really offer the functions of easy operation and safety;

2. Cost saving: the releasing member 41 and the actuating member 42 of the braking device 40 provided for the user to step on are pivotally coupled to the releasing & stopping member 43 and the matching body 12 of the body 10, respectively. By such a pivot design of a simplified linkage structure, it is not required to additionally add a manufacturing process, thus saving the cost;

3. Components are difficult to damage: the releasing member 41, the actuating member 42 and the releasing & stopping member 43 of the braking device 40 provided for the user to step on are pivotally coupled to the through holes 121 A, 121 B and the receiving hole 120 of the matching body 12, and the releasing member 41 and the actuating member 42 are pivotally coupled to the releasing & stopping member 43 to link each other. By such a design, the applied force is dispersed, and thus it is unlikely to increase the damage rate of the body structure of the truckle;

4. Fine stability and easy to distinguish: when the user step on the actuating member 42 of the braking device 40, the actuating member 42 linked with the releasing & stopping member 43 will drive the releasing member 41, and the actuating member 42 and the releasing member 41 are vertically separated. By such a design, it can provide the user the advantages, easy to distinguish the braking and releasing states, stable braking, thus offering the functions, easy to distinguish and fine stability;

5. Easy to manufacture: the releasing member 41, the actuating member 42 and the releasing & stopping member 43 of the braking device 40 provided for the user to step on, are made by injection molding or extrusion. By such a design, it is easy to manufacture the braking device 40;

6. Stable actuation: the bottom cover body 50 is an integrated chip body, and the bottom cover body 50 is formed with a plurality of fastening portions 51 to fasten with the fastening holes 122 of the body 10. By such a design, the bottom cover body 50 can be firmly fastened to the body 10 to prevent the foreign matters from blocking the actuation of the truckle body device 30.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.

Claims

1. A double-pedal double-wheel truckle with independent braking and releasing functions suitable for a precision instrument, comprising: a body, a rotating & locking device, a truckle body device, and a braking device; wherein: the body is provided for disposing the rotating & locking device, the truckle body device and the braking device;the rotating & locking device includes a fastening member which is disposed at one end of the body and provided for fastening with the braking device;the truckle body device is disposed at both sides of the body for engaging with the braking device;the braking device includes a releasing member, an actuating member, and a releasing & stopping member, the releasing member is pivotally coupled in the body, and one end of the releasing member extends out of the body and is formed with a releasing portion, the actuating member has one end pivoted to the releasing member, another end of the actuating member extends out of the body and is formed with an actuating portion, the one end of actuating member pivoted to the releasing member is coupled to the releasing & stopping member in the body, the releasing & stopping member is pivotally coupled in the body and extends toward the fastening member of the rotating & locking device and one end of the truckle body device to form an abutting engaging portion, an abutting fastening portion and an abutting locking portion, when the releasing portion of the releasing member and the actuating portion of the actuating member are separated, the abutting engaging portion, the abutting fastening portion and the abutting locking portion of the releasing member are disengaged from the fastening member and the truckle body device, and when the releasing & stopping member and the releasing portion of the releasing member are pressed toward the body, the abutting engaging portion, the abutting fastening portion and the abutting locking portion of the releasing member are engaged with the fastening member and the truckle body device, so that the truckle body device is locked from rotation.

2. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 1, wherein the body includes a receiving portion, and a plurality of matching bodies, the receiving portion is provided for disposing the rotating & locking device, each of the matching bodies is disposed adjacent to the receiving portion of the body and includes a receiving hole, a plurality of through holes and a plurality of fastening holes, the receiving hole of each of the matching bodies is provided for disposing the truckle body device, the through holes of each of the matching bodies are provided for disposing the braking device, and the fastening holes are provided for fastening with a bottom cover body.

3. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 1, wherein the rotating & locking device includes an inserting member, a matching member, a bearing member, at least one washer member, and the fastening member, one end of the inserting member of the rotating & locking device is disposed in the precision instrument, and another end of the inserting member of the rotating & locking device is inserted through the matching member, the bearing member, the washer member and the fastening member, the matching member is mounted outside the receiving portion and formed with an inserting portion, the inserting portion of the matching member is inserted through the bearing member, and the bearing member is disposed on one end of the washer member, and another end of the washer member is formed with the fastening member, and the fastening member is formed with a receiving hole for an insertion of the inserting member, and a fastening portion for fastening with the braking device.

4. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 1, wherein the truckle body device includes at least one pair of round shield-shaped shell members, at least one pair of round wheel-shaped wheels, at least one pair of disc-shaped multi-level driven members, at least one pair of round bearing members and a solid column-shaped middle shaft, the shell member is vertically formed with at least one round protruding engaging portion with a cross groove, the protruding engaging portion is disposed in the driven member, the wheel is mounted on a rounding outer end of the driven member for facilitating the wheel freely rotating around a free end of the driven member, the driven member includes a plurality of engaging holes engaged with the protruding engaging portions of the shell member, a plurality of tooth-shaped engaging portions formed on an inner surface of the driven member, and a plurality of locking portions formed around an outer periphery of a protruding flange around a central hole of the driven member, the engaging portions and the locking portion are provided for engaging with the baking device, the bearing member is positioned outside the matching body and in a hollow position of the driven member, the middle shaft is inserted through the matching body and the bearing member for restricting deviation of the bearing member.

5. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 1, wherein the releasing member is mushroom-shaped, the actuating member is L-shaped and the releasing & stopping member is flexuous chip-shaped, the releasing portion consists of a plurality of symmetrical parallel antiskid ribs for a user to step on without slippage, and another end of the releasing member is folded 90 degrees and formed with a through connecting hole at the folded portion thereof for pivotally coupling a pivot shaft to holes of the matching body, the folded end of the releasing member is pivotally linked to the actuating member by a pivot shaft, and on a surface of the folded end of the releasing member is formed a protruding stop portion, one end of the actuating member includes a plurality of through coupling holes, and another end of the actuating member includes an actuating portion with a plurality of antiskid parallel ribs for the user to step on without slippage, the through coupling holes and the through connecting hole of the releasing member are provided for the insertion of the pivot shaft, the through coupling hole is pivotally fixed at one end of the releasing &stopping member by a pivot shaft, and a vertical stop portion is formed between two coupling holes.

6. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 5, wherein the releasing & stopping member includes two opposite ear-shaped matching portions with a round hole, an arc-shaped elastic return member is formed on an elastic sheet portion between the two opposite matching portions and protrudes in an opposite direction to the matching portions, two fastening portions each of which being in the form of through hole formed by two opposite semi-circled portions are formed at both sides of the elastic sheet portion, both sides of the elastic sheet portion extend in an opposite direction to the matching portions to form two hook-shaped abutting engaging portions, a middle portion of the elastic sheet portion extends in an opposite direction to the matching portions to form an abutting fastening portion, at one end of each of two sides of the elastic sheet portion is formed an abutting locking portion which extends in an opposite direction to the matching portions, a pivot shaft is inserted through matching portion and the through coupling hole of the actuating member, and the elastic return member is disposed in the middle of the fastening portion and supports against the internal end surface of the matching body, the fastening portion is formed with the round through holes of the matching body for fastening with the braking device, the abutting engaging portions, the abutting fastening portion and the abutting locking portions are positioned against the fastening portion of the fastening member of the rotating & locking device and the engaging portion and the locking portion of the driven member of the truckle body device through braking or releasing action of the releasing member and the driven member.

7. A double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 1, wherein the body is formed with a plurality of fastening holes for fastening with a bottom cover body, and the bottom cover body includes a plurality of fastening portions for fastening with the fastening holes of the body.

8. A double-pedal double-wheel truckle with independent braking and releasing functions suitable for a precision instrument, comprising: a body, a rotating & locking device, a truckle body device, and a braking device; wherein: the body includes a receiving portion, a plurality of matching bodies, the receiving portion is provided for disposing the rotating & locking device, each of the matching bodies is disposed adjacent to the receiving portion of the body and includes a receiving hole, and a plurality of through holes, the receiving hole of each of the matching bodies is provided for disposing the truckle body device, the through holes of each of the matching bodies are provided for disposing the braking device;the rotating & locking device includes an inserting member, a matching member, a round bearing member, at least one washer member, and a fastening member, one end of the inserting member of the rotating & locking device is disposed in the precision instrument, and another end of the inserting member of the rotating & locking device is inserted through the matching member, the bearing member, the washer member and the fastening member, the matching member is mounted outside the receiving portion and formed with an inserting portion, the inserting portion of the matching member is inserted through a center of the bearing member, and the bearing member is disposed in the receiving portion and formed with more than one washer member, another end of the washer member is formed with the fastening member, and the fastening member is formed with a receiving hole for an insertion of the inserting member, and a fastening portion for fastening with the braking device;the truckle body device includes at least one pair of shell members, at least one pair of wheels, at least one pair of driven members, at least one pair of bearing members and a middle shaft, the shell members, the wheels and the bearing members are disposed at the driven member, and the middle shaft is inserted through the matching bodies of the body and the bearing members of the truckle body device for restricting a deviation of the bearing members of the truckle body device; andthe braking device includes a releasing member, an actuating member, and a releasing & stopping member, the releasing member is pivotally coupled in the body, and one end of the releasing member is formed with a releasing portion, the actuating member is pivotally coupled in the body, and one end of the actuating member is formed with an actuating portion, both the releasing portion of the releasing member and the actuating portion of the actuating member extend outside the body for a user to actuate, another end of the releasing member is pivotally coupled in the body and extends toward the fastening member of the rotating & locking device and one end of the truckle body device to form an abutting engaging portion, an abutting fastening portion and an abutting locking portion, when the releasing portion of the releasing member and the actuating portion of the actuating member are separated, the abutting engaging portion, the abutting fastening portion and the abutting locking portion of the releasing member are disengaged from the fastening member and the truckle body device, and when the releasing & stopping member and the releasing portion of the releasing member are pressed toward the body, the abutting engaging portion, the abutting fastening portion and the abutting locking portion of the releasing member are engaged with the fastening member and the truckle body device, so that the truckle body device is locked from rotation.

9. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 8, wherein each shell member includes at least one protruding engaging portion which is disposed in the driven member, and each wheel is mounted on a rounding free end of each driven member, each driven member includes a plurality of engaging holes used to engage with the protruding engaging portions of each shell member and a plurality of tooth-shaped engaging portions used to engage with the braking device, each bearing member of the truckle body device is disposed outside each of the matching bodies and in a hollow position of each driven member, and the middle shaft is inserted through the matching bodies and the bearing members for restricting deviation of the bearing members.

10. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 8, wherein the releasing member is mushroom-shaped, the actuating member is L-shaped and the releasing & stopping member is flexuous chip-shaped, the releasing portion consists of a plurality of symmetrical parallel antiskid ribs for the user to step on without slippage, and another end of the releasing member is folded 90 degrees and formed with a through connecting hole at the folded portion thereof for pivotally coupling a pivot shaft to holes of the matching body, the folded end of the releasing member is pivotally linked to the actuating member by a pivot shaft, and on a surface of the folded end of the releasing member is formed a protruding stop portion, one end of the actuating member includes a plurality of through coupling holes, and another end of the actuating member includes an actuating portion with a plurality of antiskid parallel ribs for the user to step on without slippage, the through coupling holes and the through connecting hole of the releasing member are provided for the insertion of the pivot shaft, the through coupling hole is pivotally fixed at one end of the releasing &stopping member by a pivot shaft, and a vertical stop portion is formed between two coupling holes; the releasing & stopping member includes two opposite ear-shaped matching portions with a round hole, an arc-shaped elastic return member is formed on an elastic sheet portion between the two opposite matching portions and protrudes in an opposite direction to the matching portions, two fastening portions each of which being in the form of through hole formed by two opposite semi-circled portions are formed at both sides of the elastic sheet portion, both sides of the elastic sheet portion extend in an opposite direction to the matching portions to form two hook-shaped abutting engaging portions, a middle portion of the elastic sheet portion extends in an opposite direction to the matching portions to form an abutting fastening portion, at one end of each of two sides of the elastic sheet portion is formed an abutting locking portion which extends in an opposite direction to the matching portions, a pivot shaft is inserted through matching portion and the through coupling hole of the actuating member, and the elastic return member is disposed in the middle of the fastening portion and supports against the internal end surface of the matching body, the fastening portion is formed with the round through holes of the matching body for fastening with the braking device, the abutting engaging portions, the abutting fastening portion and the abutting locking portions are positioned against the fastening portion of the fastening member of the rotating & locking device and the engaging portion and the locking portion of the driven member of the truckle body device through braking or releasing action of the releasing member and the driven member.

11. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 8, wherein the releasing & stopping member includes a matching portion, an elastic return member, a fastening portion, an abutting engaging portion and an abutting fastening portion, a pivot shaft is inserted through the matching portion of the releasing & stopping member and the through coupling hole of the actuating member, and the elastic return member is disposed in the middle of the fastening portion of the releasing & stopping member and supports against an inner end surface of the matching body of the body, the fastening portion of the rotating & locking member is disposed in the through holes of the matching body for an insertion of a pivot rod, the abutting engaging portion and the abutting fastening portion are positioned against the fastening portion of the fastening member of the rotating & locking device and the engaging portion of the driven member of the truckle body device by cooperating with a braking or releasing action of the releasing member and the actuating member.

12. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 8, wherein a bottom cover body is disposed between the rotating & locking device and the truckle body device of the body for prevent foreign matters from entering inside.

13. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 8, wherein the body is provided with a plurality of fastening holes, and a bottom cover body includes a plurality of fastening portions.

14. The double-pedal double-wheel truckle with independent braking and releasing functions as claimed in claim 13, wherein the fastening holes of the body are provided for fastening with the fastening portions of the bottom cover body.