Abstract: The string trimmer includes a connecting rod, a string trimmer head, and an operation part. The string trimmer head includes a trimmer line, a spool, a housing, and a streamlined protection structure. The spool is configured to wind the trimmer line and is capable of rotating about a first axis. The housing has an accommodating cavity for accommodating at least part of the spool and a threading hole for the trimmer line to extend to an outer side of the housing. The protection structure includes a head, a tail and a passage through which the trimmer line penetrates. The head is connected to the housing, the tail extends on the outer side of the housing, and the passage is configured to accommodate the trimmer line penetrating through the threading hole and expose the trimmer line out of the tail of the protection structure.

Abstract: A chainsaw includes a main machine, a battery pack, and a connection assembly. The battery pack is configured to supply energy to the main machine. Moreover, the battery pack and the main machine are separated from each other. The connection assembly is configured to connect the main machine and the battery pack so that the battery pack is electrically connected to the main machine. The main machine includes a chain, a guide plate, a motor, and a housing. The chain is configured to perform a cutting function. The guide plate is configured to support the chain. The motor is configured to drive the chain to move. The housing is configured to accommodate at least part of the motor. The connection assembly is detachably connected to the main machine or the battery pack.

Abstract: A chainsaw includes a main machine, a battery pack, and a connection assembly. The battery pack is configured to supply energy to the main machine. Moreover, the battery pack and the main machine are separated from each other. The connection assembly is configured to connect the main machine and the battery pack so that the battery pack is electrically connected to the main machine. The main machine includes a chain, a guide plate, a motor, and a housing. The chain is configured to perform a cutting function. The guide plate is configured to support the chain. The motor is configured to drive the chain to move. The housing is configured to accommodate at least part of the motor. The connection assembly is detachably connected to the main machine or the battery pack.

Abstract: The string trimmer includes a connecting rod, a string trimmer head, and an operation part. The string trimmer head includes a trimmer line, a spool, a housing, and a streamlined protection structure. The spool is configured to wind the trimmer line and is capable of rotating about a first axis. The housing has an accommodating cavity for accommodating at least part of the spool and a threading hole for the trimmer line to extend to an outer side of the housing. The protection structure includes a head, a tail and a passage through which the trimmer line penetrates. The head is connected to the housing, the tail extends on the outer side of the housing, and the passage is configured to accommodate the trimmer line penetrating through the threading hole and expose the trimmer line out of the tail of the protection structure.

Abstract: A backpack tool system and a backpack power supply apparatus for use with an electric tool. The backpack power supply apparatus includes a battery pack for providing electric energy, a body for carrying the battery pack, and a wearable device connected to the body and wearable by a user to carry the body. The battery pack is detachably connected to the body. The body defines a plane and a height extending in a heightwise direction. The body is at least partially symmetrical about the plane. The wearable device includes a strap, which includes an upper end connected to an upper portion of the body. The upper end of the strap applies a force to the body when the user wears the wearable device. An included angle between a projection of a direction of the force on the plane and the heightwise direction is greater than or equal to 30 degrees and less than or equal to 50 degrees.

Abstract: A backpack tool system and a backpack power supply apparatus for use with an electric tool. The backpack power supply apparatus includes a battery pack for providing electric energy, a body for carrying the battery pack, and a wearable device connected to the body and wearable by a user to carry the body. The battery pack is detachably connected to the body. The body defines a plane and a height extending in a heightwise direction. The body is at least partially symmetrical about the plane. The wearable device includes a strap, which includes an upper end connected to an upper portion of the body. The upper end of the strap applies a force to the body when the user wears the wearable device. An included angle between a projection of a direction of the force on the plane and the heightwise direction is greater than or equal to 30 degrees and less than or equal to 50 degrees.