Mk Seiko Co., Ltd.

Maruyama Industrial Co., Ltd.

Nobushige Kobayashi

Shoichi Takeda

Eichi Nishimura

Satoshi Kazama

Tohru Fujiwara

An ice cube tray consisting of an inner tray divided lengthwise and breadthwise into a plurality of pockets with open tops, and an outer tray divided into a configuration that fits the shape of the inner tray forming a space between the outer bottom of the inner tray and the inner bottom of the outer tray, with openings provided on the bottom of the inner tray so as to make transparent ice in the pockets, and additionally providing slightly curved protruding points on the bottom of the outer tray to allow for expansion.

Ice cube tray

A useful dry battery driven liquid pump for pumping liquid such as kerosene or the like into a tank for an oil heater or the like very conveniently includes a combination of a motor and a liquid pump disposed at the lower end part of a suction tube, a plurality of dry cells contained in a dry battery casing, a liquid surface level detector disposed at the lower end part of a delivery tube and a control circuit which controls operation of the liquid pump properly in response to an output from the liquid surface level detector. The liquid surface level detector includes a prism formed at the lower end of a cylindrical detector body, a light beam generating element and a light beam receiving element. The liquid pump is driven as long as the prism does not get wet with liquid and thus light is reflected from the inner optical surface of the prism toward the light beam receiving element. The liquid pump stops pumping when liquid is filled up to the level where the prism becomes wet with liquid and thereby light beam passes through the optical surface of the prism without any reflection therefrom. To prevent liquid from flowing further through the pump after its operation is stopped, a communication groove is formed at the upper part of the suction tube through which the interior of the latter is communicated with the atmosphere.

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Nagano, Japan

Nobushige Kobayashi