Abstract: An applicator has a tubular body containing a liquid to be dispensed. A non-return device is movably disposed in the tubular body rearwardly of and in contact with the liquid for preventing backflow of the liquid. A manually-displaceable piston member is displaceable in the tubular body in a forward direction for pressurizing air admitted into a chamber located in front of the piston member, and a normally closed valve communicates with the chamber and is openable by the force of the pressurized air to apply the pressurized air to the non-return device to urge the non-return device forwardly to thereby pressurize the liquid. A resilient member normally urges the piston member rearwardly to a rear stop position. An air passage communicates the chamber with the exterior of the applicator when the piston member is in the rear stop position, and the air passage is blocked by the piston member during displacement of the piston member in the forward direction.

Abstract: There is provided an applicator comprising a tubular main shaft body containing therein a liquid, a compressive device, disposed at a rear portion of the tubular main shaft body, for compressing the liquid, a non-return device positioned at a rear portion of the liquid and movable along with a decrease of the liquid, and a valve mechanism between the non-return device and the compressive means.

Abstract: A hair dyeing tool including a fluid storage chamber defined within a container body and adapted to store a coating liquid therein and a coating member having a comb member disposed forwardly of the container body. The container body serves directly as the fluid storage chamber. A valve mechanism is disposed between the fluid storage chamber and the comb member, and a rear knock member is disposed backwardly of the container body so that it is actuated by the valve mechanism to eject the hair dye liquid forwardly.

Abstract: In a liquid dispensing container for dispensing liquid from the liquid storage chamber through the dispensing port, an elastic member, which is normally closed but is opened by the pressure of liquid, is disposed at the dispensing port and the opened part of the elastic member opened by the liquid pressure is used as the dispensing port.

Abstract: An auto-tracking system for a helical scan type magnetic recording/reproducing unit comprises a synchronizing signal separating circuit from video signals on a running magnetic tape reproduced by a rotary video head, a periodicity variation measuring and comparing circuit in the synchronizing signals separated in the synchronizing signal separating circuit, and a tracking control means which controls the running condition of the magnetic tape with reference to a phase difference between a reference signal in association with the rotary video head and a signal representing the running condition of the magnetic tape and changes tracking by a predetermined amount in response to the periodicity variation measured by the measuring and comparing circuit so as to minimize the periodicity variation measured by the same, thereby an optimum tracking position is obtained without being interfered by cross-talks between the adjacent tracks.