Abstract: An antitheft ignition lock structure for car includes two timing circuits, a monostable circuit, a non-stable circuit, an analog switch, and an RS flip-flop. The first timing circuit causes the monostable circuit to drive a relay for connecting to a voltage. The flip-flop is triggered through turning on and off the ignition lock. When the ignition lock is not turned off within a predetermined time after it is first turned on and then turned on for a second time, the engine of the car could not be started and the horn of the car would sound continuously as a warning to protect the car against theft.

Abstract: A machine includes a casing disposed in a housing for receiving one or more tubes and a number of fins engaged around the tubes. A frame is slidably received in the housing, and one or more rods are secured to the frame and moved to engage into and to expand the tubes to engage with the fins when the rods are moved toward the tubes. A bracket and a seat have one or more pipes slidably received in the barrels for slidably receiving the rods and for preventing the rods from being bent. The rods each includes a mold piece for further expanding the tubes.

Abstract: An LED display collision warning circuit for vehicles is provided. This circuit causes an LED display installed at tail of a vehicle to show warning indications. The LED display has six lamps which group into three display units with each unit consisting of two laterally symmetrically positioned lamps. These three display units show different warning indications in response to signals from a door-actuated circularly lighting and extinguishing circuit, a brake-actuated alternately flashing circuit, or a headlight-actuated night distance detection circuit so as to effectively prevent collisions and accidents.