Patent Description:
Existing roly-poly toys which have overweight base parts cannot meet requirements of users of all ages. As their mechanical structures provide base parts and upper parts having unchangeable weights, users of different ages need corresponding types of roly-poly toys in different specifications. Thus, existing roly-poly toys are merely applicable for particular users and have high costs. They cannot meet requirements of users of various ages and thus have poor versatility. <CIT> discloses an anti-tipping electronic paper calendar, which is made in the form of a 'tumbler', including a shell, the shell is provided therein with a counterweight area and a work area, and the interior of the work area is movably equipped with a winding cylinder, an enwinding cylinder, a lower cylinder and an upper cylinder from the bottom to the top, and a rotating shaft is installed in each of the cylinders; and a servo motor is also included.

Aiming at existing technical problems in the art, an object of the disclosure is to provide a roly-poly toy with adjustable center of gravity, which can change the center of gravity of the roly-poly toy by changing the weights of the reel belt applied to the first winding mandrel and to the second winding mandrel, thereby providing the roly-poly toy which can amuse users of different ages.

In order to achieve the above goal, the disclosure provides a technical solution as follows.

A roly-poly toy with adjustable center of gravity comprises a first base part, a first winding mandrel rotatably mounted on the first base part, a second base part, a second winding mandrel rotatably mounted on the second base part, a reel belt, and a drive assembly; wherein the first base part and the second base part are arranged at an interval, the reel belt is annular and has a first end wound around the first winding mandrel and a second end wound around the second winding mandrel, the first winding mandrel and the second winding mandrel are each capable of rolling up and releasing the reel belt;
wherein the drive assembly is configured to switch between a first driving state and a second driving state, when the drive assembly is in the first driving state, the first winding mandrel rotates to roll up the reel belt, and the second winding mandrel rotates to release the reel belt, and when the drive assembly is in the second driving state, the second winding mandrel rotates to roll up the reel belt, and the first winding mandrel rotates to release the reel belt.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a first guiding shaft and a second guiding shaft, both of which are mounted on the first base part, wherein the first winding mandrel may be disposed between the first guiding shaft and the second guiding shaft, the reel belt on one side at the first end may extend over the first guiding shaft and abut against a circumference surface of the first guiding shaft, and the reel belt on another side at the first end may extend over the second guiding shaft and abut against a circumference surface of the second guiding shaft.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a third guiding shaft and a fourth guiding shaft, both of which are mounted on the second base part, wherein the second winding mandrel may be disposed between the third guiding shaft and the fourth guiding shaft, the reel belt on one side at the second end may extend over the third guiding shaft and abut against a circumference surface of the third guiding shaft, and the reel belt on another side at the second end may extend over the fourth guiding shaft and abut against a circumference surface of the fourth guiding shaft.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a first rotating rack and a second rotating rack, both of which are rotatably mounted on the first base part, a rotation axis of the first winding mandrel, a rotation axis of the first rotating rack, and a rotation axis of the second rotating rack may be parallel to each other, the first guiding shaft may be mounted on the first rotating rack in such a manner that an axis of the first guiding shaft is perpendicular to the rotation axis of the first rotating rack, and the second guiding shaft may be mounted on the second rotating rack in such a manner that an axis of the second guiding shaft is perpendicular to the rotation axis of the second rotating rack.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a third rotating rack and a fourth rotating rack, both of which are rotatably mounted on the second base part, a rotation axis of the second winding mandrel, a rotation axis of the third rotating rack, and a rotation axis of the fourth rotating rack may be parallel to each other, the third guiding shaft may be mounted on the third rotating rack in such a manner that an axis of the third guiding shaft is perpendicular to the rotation axis of the third rotating rack, and the fourth guiding shaft may be mounted on the fourth rotating rack in such a manner that an axis of the fourth guiding shaft is perpendicular to the rotation axis of the fourth rotating rack.

Furthermore, the first base part may be arranged with a positioning seat, the drive assembly may comprise a drive shaft rotatably mounted on the positioning seat, a first synchronous wheel connected to and coaxially rotatable with the drive shaft, a second synchronous wheel and a third synchronous wheel which are rotatably mounted on the positioning seat, a first synchronous belt, a fourth synchronous wheel mounted on the second winding mandrel and synchronously rotatable with the second winding mandrel, a fifth synchronous wheel and a sixth synchronous wheel which are rotatably mounted on the second base part, and a second synchronous belt; the drive shaft may be connected to and coaxially rotatable with the first winding mandrel, the second synchronous wheel may be connected and synchronously rotatable with the fifth synchronous wheel, and the third synchronous wheel may be connected and synchronously rotatable with the sixth synchronous wheel;.

Furthermore, the drive assembly may further comprise a slide slideably mounted on the positioning seat, wherein the slide may be slideable in a direction along an axis of the drive shaft, the slide may be provided with a first limiting groove, a first groove portion, a second groove portion, and a second limiting groove, which are disposed and in communication in this order in the direction along the axis of the drive shaft, the drive shaft may extend through the first limiting groove, the first groove portion, the second groove portion, and the second limiting groove in this order; a first mounting seat may be disposed inside the first limiting groove, a second mounting seat may be disposed inside the second limiting groove, the first mounting seat may be rotatably mounted in the first limiting groove, and the second mounting seat may be rotatably mounted in the second limiting groove, wherein the drive shaft may be provided at a circumference surface with a snap-in column located between the first mounting seat and the second mounting seat, the first winding mandrel may be arranged with a rotatable plate which is fixedly connected to and coaxially rotatable with the first winding mandrel, an end surface of the rotatable plate may be provided with a first engagement groove, an end surface of the first synchronous wheel may be provided with a second engagement groove, the first mounting seat may be arranged with a first engagement piece for engagement with the first engagement groove, and the second mounting seat may be arranged with a second engagement piece for engagement with the second engagement groove;.

Furthermore, an end surface of the first mounting seat may be provided with a first mounting groove, in which a first compression spring is mounted, with one end of the first compression spring being fixedly connected with a bottom wall of the first mounting groove, and another end of the first compression spring being fixedly connected with the first engagement piece, and an end surface of the second mounting seat may be provided with a second mounting groove, in which a second compression spring is mounted, with one end of the second compression spring being fixedly connected with a bottom wall of the second mounting groove, and another end of the second compression spring being fixedly connected with the second engagement piece.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a mounting frame, wherein the drive assembly may further comprise a first connecting column and a second connecting column, the second synchronous wheel may be connected with the fifth synchronous wheel by the first connecting column, the third synchronous wheel may be connected with the sixth synchronous wheel by the second connecting column, one end of the mounting frame may be fixedly connected with the second base part, and another end of the mounting frame may be fixedly connected with the positioning seat, the mounting frame may be provided with a belt groove which allows the reel belt to pass along, a first column groove for mounting the first connecting column, and a second column groove for mounting the second connecting column.

Furthermore, the drive assembly may further comprise a handle rotatably mounted on the positioning seat, and the drive shaft and the handle are connected to and coaxially rotatable with each other.

Furthermore, the roly-poly toy with adjustable center of gravity may further comprise a dust cover covered on the second base part.

In a particular embodiment, the roly-poly toy with adjustable center of gravity may further comprise a stop block, and a second end of the reel belt may be located between the stop block and the second base part.

Compared with the existing technologies, the disclosure has advantages as follows. It can change the center of gravity of the roly-poly toy by changing the weights of the reel belt applied to the first winding mandrel and to the second winding mandrel, i.e., the weights of the lower portion and the upper portion of the roly-poly toy, thereby providing the roly-poly toy which can amuse users of different ages. Further, the center of gravity of the roly-poly toy can be manually adjusted. Thus, the disclosure has a simple structure and reduced maintenance cost and use cost than automatically adjusted ones. Hence, the disclosure provides the roly-poly toy which meets requirements of users of various ages and have good versatility at very low use cost.

In the drawings: <NUM>. first base part; <NUM>. first winding mandrel; <NUM>. second base part; <NUM>. second winding mandrel; <NUM>. reel belt; <NUM>. drive assembly; <NUM>. first guiding shaft; <NUM>. second guiding shaft; <NUM>. third guiding shaft; <NUM>. fourth guiding shaft; <NUM>. first rotating rack; <NUM>. second rotating rack; <NUM>. third rotating rack; <NUM>. fourth rotating rack; <NUM>. positioning seat; <NUM>. mounting frame; <NUM>. dust cover;.

The embodiments of the disclosure will be further explained below in detail with reference to drawings and embodiments. The embodiments are illustrative and are not intended to limit the scope of the invention.

It should be noted that, unless explicitly stated or limited otherwise, terms such as "mount", "couple", "connect" and "communicate" in the description should be understood broadly. For example, it may refer to fixedly connection, or detachably connection, or integrally connection; it may refer to mechanically connection, or electrically connection; directly connection, or indirectly connection by a medium, or internally communication of two components. Those skilled in the art may understand particular meanings of the terms in the description according to specific circumstances.

For convenience of description, unless otherwise stated, upper and lower directions mentioned below refer to upper and lower directions as shown in <FIG>, left and right directions mentioned below refer to left and right directions as shown in <FIG>, the clockwise direction mentioned below refers to the direction in which the first winding mandrel rotates in clockwise direction when viewed from above to bottom as shown in <FIG>, and the counterclockwise direction mentioned below refers to the direction in which the first winding mandrel rotates in counterclockwise direction when viewed from above to bottom as shown in <FIG>.

Referring to <FIG>, the roly-poly toy with adjustable center of gravity in the embodiment comprises a first base part <NUM>, a first winding mandrel <NUM> rotatably mounted on the first base part <NUM>, a second base part <NUM>, a second winding mandrel <NUM> rotatably mounted on the second base part <NUM>, a reel belt <NUM>, and a drive assembly <NUM>. Herein, the first base part <NUM> and the second base part <NUM> are arranged at an interval. The reel belt <NUM> is annular. It has a first end and a second end. The first end (the lower end) of the reel belt <NUM> is wound around the first winding mandrel <NUM>, and the second end (the upper end) of the reel belt <NUM> is wound around the second winding mandrel <NUM>. The first base part <NUM> is placed right below the second base part <NUM>. The first base part <NUM> is hemispherical and is provided with a hemispherical cavity, and the first winding mandrel <NUM> is disposed in the hemispherical cavity. The axes of the first winding mandrel <NUM> and of the second winding mandrel <NUM> are vertically arranged and lie on a same straight line.

The drive assembly <NUM> is configured to switch between a first driving state and a second driving state. When the drive assembly <NUM> is in the first driving state, the drive assembly <NUM> directly drives the first winding mandrel <NUM> to rotate and roll up the reel belt <NUM>. As the first winding mandrel <NUM> rolls up the reel belt <NUM>, it pulls the reel belt <NUM>, such that the second winding mandrel <NUM> is rotated to release the reel belt <NUM>, allowing the reel belt <NUM> to wind around the first winding mandrel <NUM>. In such a manner, the gravity force acting on the first base part <NUM> increases, and the center of gravity of the roly-poly toy moves downward. The more the first winding mandrel <NUM> is rotated, the greater the gravity force acting on the first base part <NUM> is, and the greater the force required for pushing the roly-poly toy is. When the drive assembly <NUM> is in the second driving state, the drive assembly <NUM> directly drives the second winding mandrel <NUM> to rotate and roll up the reel belt <NUM>. As the second winding mandrel <NUM> rolls up the reel belt <NUM>, it pulls the reel belt <NUM>, such that the first winding mandrel <NUM> is rotated to release the reel belt <NUM>, allowing the reel belt <NUM> to wind around the second winding mandrel <NUM>. In such a manner, the gravity force acting on the second base part <NUM> increases, and the center of gravity of the roly-poly toy moves upward. The more the second winding mandrel <NUM> is rotated, the less the gravity force acting on the first base part <NUM> is, and the less the force required for pushing the roly-poly toy is.

In a particular embodiment, the reel belt <NUM> may be a tape, a chain, or a rope.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a first guiding shaft <NUM>, a second guiding shaft <NUM>. Herein, the first guiding shaft <NUM> and the second guiding shaft <NUM> are mounted on the first base part <NUM>. The first winding mandrel <NUM> is disposed between the first guiding shaft <NUM> and the second guiding shaft <NUM>. The reel belt <NUM> is arranged in such a manner that a portion of the reel belt <NUM> on one side at the first end travels over the first guiding shaft <NUM> and abuts against the outer circumference surface of the first guiding shaft <NUM>, and a portion of the reel belt <NUM> on the other side at the first end travels over the second guiding shaft <NUM> and abuts against the outer circumference surface of the second guiding shaft <NUM>. The axes of the first guiding shaft <NUM> and the second guiding shaft <NUM> are horizontally arranged and are perpendicular to the first winding mandrel <NUM>. The reel belt <NUM> is guided in such a manner that the portion of the reel belt <NUM> on the one side at the first end horizontally extends and travels over the first guiding shaft <NUM>, and then rotates ninety degrees and extends upward, and the portion of the reel belt <NUM> on the other side at the first end horizontally extends and travels over the second guiding shaft <NUM>, and then rotates ninety degrees and extends upward.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a third guiding shaft <NUM>, and a fourth guiding shaft <NUM>. Herein, both the third guiding shaft <NUM> and the fourth guiding shaft <NUM> are mounted on the second base part <NUM>. The second winding mandrel <NUM> is disposed between the third guiding shaft <NUM> and the fourth guiding shaft <NUM>. The reel belt <NUM> is arranged in such a manner that a portion of the reel belt <NUM> on one side at the second end travels over the third guiding shaft <NUM> and abuts against the outer circumference surface of the third guiding shaft <NUM>, and a portion of the reel belt <NUM> on the other side at the second end travels over the fourth guiding shaft <NUM> and abuts against the outer circumference surface of the fourth guiding shaft <NUM>. The axes of the third guiding shaft <NUM> and the fourth guiding shaft <NUM> are horizontally arranged and are perpendicular to the second winding mandrel <NUM>. The reel belt <NUM> is guided in such a manner that the portion of the reel belt <NUM> on the one side at the second end horizontally extends and travels over the third guiding shaft <NUM>, and then rotates ninety degrees and extends downward, and the portion of the reel belt <NUM> on the other side at the second end horizontally extends and travels over the fourth guiding shaft <NUM>, and then rotates ninety degrees and extends downward.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a first rotating rack <NUM> and a second rotating rack <NUM>, both of which are rotatably mounted on the first base part <NUM>. The rotation axis of the first winding mandrel <NUM>, the rotation axis of the first rotating rack <NUM>, and the rotation axis of the second rotating rack <NUM> are parallel to each other. The first guiding shaft <NUM> is rotatably mounted on the first rotating rack <NUM> in such a manner that the axis of the first guiding shaft <NUM> is perpendicular to the rotation axis of the first rotating rack <NUM>. The second guiding shaft <NUM> is rotatably mounted on the second rotating rack <NUM> in such a manner that the axis of the second guiding shaft <NUM> is perpendicular to the rotation axis of the second rotating rack <NUM>. The rotation axes of the first rotating rack <NUM> and the second rotating rack <NUM> are vertically arranged. The first winding mandrel <NUM> is disposed between the first rotating rack <NUM> and the second rotating rack <NUM>. By rotating the first rotating rack <NUM> and the second rotating rack <NUM>, the guiding angles of the first guiding shaft <NUM> and the second guiding shaft <NUM> can be adjusted, such that rotation angle and turning angle of the reel belt <NUM> can be changed.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a third rotating rack <NUM> and a fourth rotating rack <NUM>, both of which are rotatably mounted on the second base part <NUM>. The rotation axis of the second winding mandrel <NUM>, the rotation axis of the third rotating rack <NUM>, and the rotation axis of the fourth rotating rack <NUM> are parallel to each other. The third guiding shaft <NUM> is rotatably mounted on the third rotating rack <NUM> in such a manner that the axis of the third guiding shaft <NUM> is perpendicular to the rotation axis of the third rotating rack <NUM>. The fourth guiding shaft <NUM> is rotatably mounted on the fourth rotating rack <NUM> in such a manner that the axis of the fourth guiding shaft <NUM> is perpendicular to the rotation axis of the fourth rotating rack <NUM>. The rotation axes of the third rotating rack <NUM> and the fourth rotating rack <NUM> are vertically arranged. The second winding mandrel <NUM> is disposed between the third rotating rack <NUM> and the fourth rotating rack <NUM>. By rotating the third rotating rack <NUM> and the fourth rotating rack <NUM>, the guiding angles of the third guiding shaft <NUM> and the fourth guiding shaft <NUM> can be adjusted, such that rotation angle and turning angle of the reel belt <NUM> can be changed.

Referring to <FIG>, in a particular embodiment, the first base part <NUM> is arranged with a positioning seat <NUM>, and the positioning seat <NUM> is mounted in the hemispherical cavity of the first base part <NUM>. The drive assembly <NUM> comprises a drive shaft <NUM> rotatably mounted on the positioning seat <NUM>, a first synchronous wheel <NUM> connected to and coaxially rotatable with the drive shaft <NUM>, a second synchronous wheel <NUM> and a third synchronous wheel <NUM> which are rotatably mounted on the positioning seat <NUM>, a first synchronous belt <NUM>, a fourth synchronous wheel <NUM> mounted on the second winding mandrel <NUM> and synchronously rotatable with the second winding mandrel <NUM>, a fifth synchronous wheel <NUM> and a sixth synchronous wheel <NUM> which are rotatably mounted on the second base part <NUM>, and a second synchronous belt <NUM>. The drive shaft <NUM> is connected to and coaxially rotatable with the first winding mandrel <NUM>. The second synchronous wheel <NUM> is connected and synchronously rotatable with the fifth synchronous wheel <NUM>. The third synchronous wheel <NUM> is connected and synchronously rotatable with the sixth synchronous wheel <NUM>. When it is required to roll up the reel belt <NUM> by the first winding mandrel <NUM>, the drive shaft <NUM> can be disconnected from the first synchronous wheel <NUM> and connected with the first winding mandrel <NUM>. The drive shaft <NUM> can drive the first winding mandrel <NUM> to rotate and roll up the reel belt <NUM>, such that the portion of the reel belt <NUM> which lie on the second winding mandrel <NUM> is pulled and released. When it is required to roll up the reel belt <NUM> by the second winding mandrel <NUM>, the drive shaft <NUM> can be connected with the first synchronous wheel <NUM> and disconnected from the first winding mandrel <NUM>. When the drive shaft <NUM> drives the first synchronous wheel <NUM> to rotate and roll up the reel belt <NUM>, the first synchronous wheel <NUM> indirectly drives the third synchronous wheel to rotate, and then the third synchronous wheel leads the second winding mandrel <NUM> to rotate and roll up the reel belt <NUM>, such that the portion of the reel belt <NUM> which lie on the first winding mandrel <NUM> can be pulled and released.

The first synchronous belt <NUM> is annular shaped and has one end engaged to the second synchronous wheel <NUM> and another end engaged to the third synchronous wheel <NUM>. The first synchronous wheel <NUM> is located between the second synchronous wheel <NUM> and the third synchronous wheel <NUM>, within the area surrounded by the first synchronous belt <NUM>, and the first synchronous wheel <NUM> is engaged with an inside of the first synchronous belt <NUM>.

The second synchronous belt <NUM> is annular shaped and has one end engaged to the fifth synchronous wheel <NUM> and another end engaged to the sixth synchronous wheel <NUM>. The fourth synchronous wheel <NUM> is located between the fifth synchronous wheel <NUM> and the sixth synchronous wheel <NUM>, within the area surrounded by the second synchronous belt <NUM>, and the fourth synchronous wheel <NUM> is engaged with an inside of the second synchronous belt <NUM>.

In a particular embodiment, the drive assembly <NUM> further comprises a slide <NUM> slideably mounted on the positioning seat <NUM>. The slide <NUM> is slideable up and down in a direction along the axis of the drive shaft <NUM>. The slide <NUM> is provided with a first limiting groove <NUM>, a first groove portion <NUM>, a second groove portion <NUM>, and a second limiting groove <NUM>. The first limiting groove <NUM>, the first groove portion <NUM>, the second groove portion <NUM>, and the second limiting groove <NUM> are disposed and communicated in this order from bottom to top, in a direction along the axis of the drive shaft <NUM>. The drive shaft <NUM> extends through the first limiting groove <NUM>, the first groove portion <NUM>, the second groove portion <NUM>, and the second limiting groove <NUM> in this order. A first mounting seat <NUM> is disposed inside the first limiting groove <NUM>. A second mounting seat <NUM> is disposed inside the second limiting groove <NUM>. The first mounting seat <NUM> is rotatably mounted in the first limiting groove <NUM>. The drive shaft is provided at its circumference surface with a first engagement piece. The first mounting seat <NUM> is provided with a first slide chute for engagement with the first engagement piece, and the first slide chute extends through the first mounting seat <NUM> in a direction along the axis of the drive shaft. The first mounting seat <NUM> is rotatable about the axis of the drive shaft <NUM> and is slidable along with the slide <NUM>. The first mounting seat is rotatable due to the first engagement piece, and is slidable up and down in a direction along the axis of the drive shaft. The second mounting seat <NUM> is rotatably mounted in the second limiting groove <NUM>. The drive shaft is provided at its circumference surface with a second engagement piece. The second mounting seat <NUM> is provided with a second slide chute for engagement with the second engagement piece, and the second slide chute extends through the second mounting seat <NUM> in a direction along the axis of the drive shaft. The second mounting seat <NUM> is rotatable about the axis of the drive shaft <NUM> and is slidable along with the slide <NUM>. Due to the second engagement piece, the second mounting seat is rotatable, and the second mounting seat is slidable up and down in a direction along the axis of the drive shaft. The drive shaft <NUM> is provided at its outer circumference surface with two snap-in columns respectively disposed at two sides on the outer circumference surface of the drive shaft <NUM> in such a manner that the axis of the snap-in columns <NUM> is horizontally arranged. The snap-in columns <NUM> are located between the first mounting seat <NUM> and the second mounting seat <NUM>. The upper end surface of the first winding mandrel <NUM> is fixedly arranged with a rotatable plate <NUM>, which is fixedly connected to and coaxially rotatable with the first winding mandrel <NUM>. The upper end surface of the rotatable plate <NUM> is provided with a first engagement groove (not shown in the drawings), and the lower end surface of the first mounting seat <NUM> is mounted with a first engagement piece <NUM> for engagement with the first engagement groove. The first synchronous wheel <NUM> is placed above the rotatable plate <NUM>. The lower end surface of the first synchronous wheel <NUM> is provided with a second engagement groove (not shown in the drawings), and the upper end surface of the second mounting seat <NUM> is mounted with a second engagement piece <NUM> for engagement with the second engagement groove. When the slide <NUM> moves upward, the first engagement piece <NUM> is disengaged from the first engagement groove, and the second engagement piece <NUM> is engaged with the second engagement groove. In such a case, the drive shaft <NUM> drives the first synchronous wheel <NUM> to rotate. When the slide <NUM> moves downward, the second engagement piece <NUM> is disengaged from the second engagement groove, and the first engagement piece <NUM> is engaged with the first engagement groove. In such a case, the drive shaft <NUM> drives the rotatable plate <NUM> to rotate.

The wall formed between the first groove portion <NUM> and the second groove portion <NUM> is provided with communication paths <NUM> for communicating the first groove portion <NUM> with the second groove portion <NUM>. Two communication paths <NUM> are provided and are in one-to-one correspondence with the two snap-in columns <NUM>. The snap-in columns <NUM> are moveable between the first groove portion <NUM> and the second groove portion <NUM> via the communication paths <NUM>. The communication paths <NUM> extends along the diameter direction of the drive shaft <NUM>. Each of the communication paths <NUM> has a first side wall and a second side wall which are opposite to each other. A first straight shaft (not shown in the drawings) is arranged on the first side wall, and the first straight shaft is sleeved with a first torsion spring (not shown in the drawings). A second straight shaft (not shown in the drawings) is arranged on the second side wall, and the second straight shaft is sleeved with a second torsion spring (not shown in the drawings). A first guiding plate <NUM> is mounted on the first straight shaft, with one end (the upper end) of the first guiding plate <NUM> being rotatably mounted on the first straight shaft and another end (the lower end) of the first guiding plate <NUM> extending into the first groove portion <NUM>. The distance from the wall formed between the first limiting groove <NUM> and the first groove portion <NUM> to the lower end of the first guiding plate <NUM> is less than the diameter of each of the snap-in columns <NUM>. In the embodiment, the lower end of the first guiding plate <NUM> is tangent to the plane defined by the wall formed between the first limiting groove <NUM> and the first groove portion <NUM>. The first guiding plate <NUM> is arranged to tilt towards the axis of the drive shaft <NUM>. A second guiding plate <NUM> is mounted on the second straight shaft, with one end (the lower end) of the second guiding plate <NUM> being rotatably mounted on the second straight shaft and another end (the upper end) of the second guiding plate <NUM> extending into the second groove portion <NUM>. The distance from the wall formed between the second groove portion <NUM> and the second limiting groove <NUM> to the upper end of the second guiding plate <NUM> is less than the diameter of each of the snap-in columns <NUM>. In the embodiment, the upper end of the second guiding plate <NUM> is tangent to the plane defined by the wall formed between the second limiting groove <NUM> and the second groove portion <NUM>. The second guiding plate <NUM> is arranged to tilt towards the axis of the drive shaft <NUM>. The first guiding plate <NUM> and the second guiding plate <NUM> are parallel to each other. One end of the first torsion spring is fixedly connected with the first side wall, and the other end of the first torsion spring is fixedly connected with the first guiding plate <NUM>. One end of the second torsion spring is fixedly connected with the second side wall, and the other end of the second torsion spring is fixedly connected with the second guiding plate <NUM>. Once the snap-in columns <NUM> are rotated to arrive at the lower end of the first guiding plate <NUM> when the snap-in columns <NUM> are driven to rotate in a clockwise direction in the first groove portion <NUM>, the snap-in columns <NUM> can be guided by the first guiding plate <NUM> to slide into the second groove portion <NUM> and rotate in a clockwise direction in the second groove portion <NUM>, such that the slide <NUM> moves downward. When the snap-in columns <NUM> rotate in a clockwise direction in the second groove portion <NUM>, once the snap-in columns <NUM> get to the upper end of second guiding plate <NUM>, the second torsion spring can be compressed and the upper end of the second guiding plate <NUM> can be rotated downward. In such a case, the snap-in columns <NUM> can travel over the second guiding plate <NUM> to continue rotating. Then, due to the second torsion spring, the upper end of the second guiding plate <NUM> can be rotated back upward. The above process is repeated during the rotation of the snap-in columns <NUM> in a clockwise direction in the second groove portion <NUM>. When the snap-in columns <NUM> rotate in the counter direction (the counter-clockwise direction) in the second groove portion <NUM>, once the snap-in columns <NUM> are rotated to arrive at the upper end of the second guiding plate <NUM>, the snap-in columns <NUM> can be guided by the second guiding plate <NUM> to slide into the first groove portion <NUM> and rotate in a counter-clockwise direction in the first groove portion <NUM>, such that the slide <NUM> moves upward. When the snap-in columns <NUM> rotate in a counter-clockwise direction in the first groove portion <NUM>, once the snap-in columns <NUM> get to the lower end of first guiding plate <NUM>, the first torsion spring can be compressed and the lower end of the first guiding plate <NUM> can be rotated upward. In such a case, the snap-in columns <NUM> can travel over the first guiding plate <NUM> to continue rotating. Then, due to the first torsion spring, the lower end of the first guiding plate <NUM> can be rotated back downward. The above process is repeated during the rotation of the snap-in columns <NUM> in a counter-clockwise direction in the first groove portion <NUM>.

When the snap-in columns <NUM> is in the first groove portion <NUM>, the first engagement piece <NUM> is disengaged from the first engagement groove, and the second engagement piece <NUM> is engaged with the second engagement groove. When the snap-in columns <NUM> is in the second groove portion <NUM>, the first engagement piece <NUM> is engaged with the first engagement groove, and the second engagement piece <NUM> is disengaged from the second engagement groove.

In a particular embodiment, the lower end surface of the first mounting seat <NUM> is provided with a first mounting groove (not shown in the drawings), in which a first compression spring (not shown in the drawings) is mounted. One end of the first compression spring is fixedly connected with the bottom wall of the first mounting groove, and the other end of the first compression spring is fixedly connected with the first engagement piece <NUM>. The upper end surface of the second mounting seat <NUM> is provided with a second mounting groove (not shown in the drawings), in which a second compression spring (not shown in the drawings) is mounted. One end of the second compression spring is fixedly connected with the bottom wall of the second mounting groove, and the other end of the second compression spring is fixedly connected with the second engagement piece <NUM>.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a mounting frame <NUM>. The drive assembly <NUM> further comprises a first connecting column <NUM> and a second connecting column <NUM>. The second synchronous wheel <NUM> is connected with the fifth synchronous wheel <NUM> by the first connecting column <NUM>, and the third synchronous wheel <NUM> is connected with the sixth synchronous wheel <NUM> by the second connecting column <NUM>. One end of the mounting frame <NUM> is fixedly connected with the second base part <NUM>, and another end of the mounting frame <NUM> is fixedly connected with the positioning seat <NUM>. The mounting frame <NUM> is provided with belt grooves which allow the reel belt <NUM> to pass along, a first column groove for mounting the first connecting column <NUM>, and a second column groove for mounting the second connecting column <NUM>. The positioning seat <NUM> is mounted in the hemispherical cavity of the first base part <NUM>. The lower end of the mounting frame <NUM> is attached to the upper surface of the positioning seat <NUM>, and the upper end of the mounting frame <NUM> is connected with the second base part <NUM>. The first connecting column <NUM> is rotatably mounted in the first column groove, and the second connecting column <NUM> is rotatably mounted in the second column groove. Two belt grooves are located respectively on two sides of the axis of the drive shaft <NUM>, and the reel belt <NUM> is slidable up and down in the belt grooves at two the sides.

In a particular embodiment, the drive assembly <NUM> further comprises handles <NUM> rotatably mounted on the positioning seat <NUM>, and the handles <NUM> are connected to and coaxially rotatable with the drive shaft <NUM>. The upper surface of the positioning seat <NUM> is provided with circular recesses, in which the handles <NUM> are rotatably mounted, respectively. The upper end of the drive shaft <NUM> is connected with the handles <NUM>, such that the drive shaft <NUM> rotates rotate along with the handles <NUM>.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a dust cover <NUM>, and the dust cover <NUM> is covered on the second base part <NUM>.

In a particular embodiment, the roly-poly toy with adjustable center of gravity further comprises a stop block. The second end of the reel belt <NUM> is located between the stop block and the second base part <NUM>. The lower end of the second winding mandrel <NUM> is mounted on the second base part <NUM>, and the stop block is disposed at the upper end of the second winding mandrel <NUM>.

The working principle of the embodiments of the disclosure is as follows.

When it is required to transfer the gravity force acting on the second base part of the roly-poly toy to the first base part in the first adjustment mode, the handles can be rotated in clockwise direction to drive the snap-in columns to rotate in the second groove portion, until the first engagement piece is engaged in the first engagement groove and the second engagement piece is disengaged from the second engagement groove. In such a manner, the first winding mandrel can be directly driven to rotate and roll up the reel belt by driving the rotatable plate to rotate by the handles. Due to the first winding mandrel which pulls the reel belt, the portion of the reel belt wound around the second winding mandrel can be automatically released. As the second winding mandrel is rotated to release the reel belt, the fourth synchronous wheel is driven to rotate and indirectly drives the first synchronous wheel to rotate. Hence, the gravity force acting on the second base part can be transferred to the first base part.

When it is required to transfer the gravity force acting on the first base part of the roly-poly toy to the second base part in the second adjustment mode, the handles can be rotated in counter-clockwise direction to drive the snap-in columns to rotate in the second groove portion. When the snap-in columns are rotated to arrive at the communication paths in the second groove portion, the snap-in columns can be guided by the first guiding plate and the second guiding plate to slide into the first groove portion and slide therein. During the process, the slide is driven by the snap-in columns to move upward, until the second engagement piece is engaged in the second engagement groove of the first synchronous wheel, and the first engagement piece is disengaged from the first engagement groove. In such a manner, the first synchronous wheel, which is directly driven to rotate by the handles, can drive the fourth synchronous wheel to rotate, such that the fourth synchronous wheel can drive the second winding mandrel to rotate and actively roll up the reel belt. In such a manner, the portion of the reel belt wound around the second winding mandrel is pulled and can be automatically released. Hence, the gravity force acting on the first base part can be transferred to the second base part.

If it is required to transfer the gravity force acting on the second base part of the roly-poly toy to the first base part again, the handles can be rotated in clockwise direction, to allow the snap-in columns which rotate in clockwise direction in the second groove portion to arrive at the communication paths. Then, the snap-in columns can be guided by the first guiding plate and the second guiding plate to return into the second groove portion and continue rotating therein. During the process, the slide moves downward, until the first engagement piece is engaged in the first engagement groove, and the second engagement piece is disengaged from the second engagement groove, switching into the first adjustment mode.

Claim 1:
A roly-poly toy with adjustable center of gravity, wherein the roly-poly toy with adjustable center of gravity comprises: a first base part (<NUM>), a first winding mandrel (<NUM>) rotatably mounted on the first base part (<NUM>), a second base part (<NUM>), a second winding mandrel (<NUM>) rotatably mounted on the second base part (<NUM>), a reel belt (<NUM>), and a drive assembly (<NUM>);
wherein the first base part (<NUM>) and the second base part (<NUM>) are arranged at an interval, the reel belt (<NUM>) is annular and has a first end wound around the first winding mandrel (<NUM>) and a second end wound around the second winding mandrel (<NUM>), the first winding mandrel (<NUM>) and the second winding mandrel (<NUM>) are each capable of rolling up and releasing the reel belt (<NUM>);
wherein the drive assembly (<NUM>) is configured to switch between a first driving state and a second driving state, when the drive assembly (<NUM>) is in the first driving state, the first winding mandrel (<NUM>) rotates to roll up the reel belt (<NUM>), and the second winding mandrel (<NUM>) rotates to release the reel belt (<NUM>), and when the drive assembly (<NUM>) is in the second driving state, the second winding mandrel (<NUM>) rotates to roll up the reel belt (<NUM>), and the first winding mandrel (<NUM>) rotates to release the reel belt (<NUM>).