Patent ID: 11910743
Assignee: NANJING CHERVON INDUSTRY CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC A | IPC A

Claim 8:
9. A grass trimmer, comprising:
a grass trimming head;
a motor configured to drive the grass trimming head to rotate;
a motor housing configured to accommodate or mount the motor;
a handle for being gripped by a user;
a first housing used for connecting a battery pack;
a guide wire electrically connected to the battery pack and the motor; and
a connecting pipe connected to the motor housing and the first housing, wherein the first housing and the motor housing are respectively fixed to two ends of the connecting pipe;
wherein the connecting pipe has a hollow tubular structure, at least a portion of the connecting pipe is composed of a carbon fiber material, and the guide wire is located inside the connecting pipe, and at least a portion of the carbon fiber material is rolled from multi-layered fiber material sheets arranged layer by layer,
wherein the connecting pipe further comprises an outer layer member comprising a carbon fiber material and an inner layer member comprising a carbon fiber material, the outer layer member is sleeved on a circumference of the inner layer member, and a fiber arrangement direction of the inner layer member is different from a fiber arrangement direction of the outer layer member,
wherein the grass trimmer further comprises a circuit board electrically connected to the motor, the first housing is formed with a first chamber for accommodating the circuit board, the motor housing is formed with a second chamber for accommodating the motor, and the connecting pipe is formed with an airflow passage for communicating the first chamber with the second chamber,
wherein the fiber arrangement direction of the inner layer member coincides with an extending direction of the connecting pipe, and fibers of the outer layer member are arranged in a cross-hatched arrangement,
wherein the connecting pipe further comprises an embedded member and the inner layer member is sleeved on a circumference of the embedded member, and
wherein the embedded member is made of metal or plastic material.