Abstract: An engine includes a cylinder, a rocker chamber, an air filter, a crankcase and a rocker chamber cover, wherein the rocker chamber cover is disposed above the cylinder. The engine further includes a cover plate, wherein the cover plate is located at the top of the rocker chamber cover, and the rocker chamber cover and the cover plate are spliced to form a separation cavity and a connection channel. According to the engine provided by the invention, the top structure of the rocker chamber is re-designed and the top space of the rocker chamber is sufficiently used so as to achieve the objects of optimizing a lubricating system and reducing emission, as well as reducing the manufacturing cost and difficulty.

Abstract: An exemplary housing includes a light metal base and a ceramic film. The light metal base has an outer surface. The ceramic film is formed on the outer surface of the light metal base by micro-arc oxidation process. A method for making the present housing is also provided.

Abstract: The present invention relates to a power tool comprises a supply wire, a power switch and a first electrical circuit including the power switch. The power tool further comprises a power indicating device which includes a power indicator which can emit light visible to indicate whether power is on or off and forming a second electrical circuit. The second electrical circuit and the first electrical circuit are connected in parallel to the supply wire.

Abstract: A trolley member for a garage door opener, comprises a trolley body (2), a connecting rod (7), a gear shaft (3) disposed on the trolley body (2), a rack (5) disposed on the trolley body (2), a gear (9) disposed on the gear shaft (3). The teeth of the gear (9) is engaged with the teeth of the rack (5). The rack (5) is connected to a spring device. The rack (5) has two working status. A first working status is that the rack (5) is inserted into a slot (10) of a chain link (8) and the spring member urges the rack (5) to the first working status, and a second working status is that the rack (5) is detached from the slot (10). The rack (5) is always urged to the first working status by the spring device, thereby the motor can reliably drive the chain and then the trolley member moving, and the chain can not be idling.

Abstract: A trolley member for a garage door opener, comprises a trolley body (2), a connecting rod (7), a gear shaft (3) disposed on the trolley body (2), a rack (5) disposed on the trolley body (2), a gear (9) disposed on the gear shaft (3). The teeth of the gear (9) is engaged with the teeth of the rack (5). The rack (5) is connected to a spring device. The rack (5) has two working status. A first working status is that the rack (5) is inserted into a slot (10) of a chain link (8) and the spring member urges the rack (5) to the first working status, and a second working status is that the rack (5) is detached from the slot (10). The rack (5) is always urged to the first working status by the spring device, thereby the motor can reliably drives the chain and then the trolley member moving, and the chain can not be idling.