Abstract: A connector for distribution equipment, comprising a cylindrical outer conductor fixed to a casing, a substantially cylindrical insulator inserted in the outer conductor, an inner resilient conductive member inserted and so retained in the insulator, porjections provided radially inward on an opening formed on a portion through which an internal space of the casing and an internal space of the outer conductor communicate with each other, and flexible legs provided projectingly further rearward of a rear end surface of the insulator and having claws formed radially outward on the nose portion thereof. The insulator is inserted in the outer conductor with the flexible legs bent radially inward, and, as a result of the returning of the legs at instant when the claws of the leg come in across the projection of the opening, the insulator can be mounted and so fixed in the outer conductor through engagement of the claws and the projections.

Abstract: An ultrasonic alarm device has a detector for detecting a reflected ultrasonic wave in a watching area to obtain a Doppler signal due to motion of a person, a Schmitt circuit for converting the detection output into a pulse output and a waveform shaping circuit for shaping the pulse output into a pulse train having a certain pulse width. The output of the waveform shaping circuit is fed in parallel to two band-pass digital filters, one for the Doppler signal and the other for noise signals. Each of the filters comprises two monostable multivibrators connected in parallel and an AND gate having three inputs of which one is connected through an inverter to the output of one monostable multivibrator, a second is connected to the output of the second monostable multivibrator and the third to the input of the monostable multivibrators.

Abstract: An ultrasonic wave type alarm device is provided with a narrow band filter for passing only a Doppler effect signal of a human body, and a quick discharge type integration circuit for removing the effect of a Doppler effect signal of a small animal other than the human body, thereby to carry out an alarm operation correctly.