Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Casings
Patent
1995-02-06
1997-04-15
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Casings
174 523, 220 402, 220614, 324 99D, 324115, G01R 104, G01D 1124, H05K 500
Patent
active
056213115
ABSTRACT:
A digital multimeter is provided with a highly reliable seal at a connection interface between an upper and lower enclosure forming an enclosure. The multimeter also has a highly reliable seal at peripheral boundaries of operating elements disposed on a surface of the enclosure thereby providing a highly-reliable, water-proof and dust-proof mechanism at a low cost. A packing serves as an elastic sealing material and is disposed at the connection interface between the upper enclosure and the lower enclosure. The packing is pressed and crushed in a slant direction relative to the direction of the thickness of the enclosure thereby providing a sealing mechanism at the connection interface. The periphery of a rubber key serving as an operating element is sealed by a double sealing mechanism comprising an uneven face formed on a peripheral side and an even face formed on the upper enclosure. The periphery of a rotary switch is sealed by a sealing mechanism including an O-ring pressed in a direction perpendicular to the thickness of the enclosure. Thus, the invention provides a simple sealing mechanism for a digital multimeter which provides excellent protection from water and dust.
REFERENCES:
patent: 2852154 (1958-09-01), Brown
patent: 3685682 (1972-08-01), Frey, III
patent: 3924185 (1975-12-01), Schwartz
patent: 4176315 (1979-11-01), Sunnarborg
patent: 4951834 (1990-08-01), Aikins
patent: 5140259 (1992-08-01), Aida
Nihon Keizai Shinbun (Japan Economic News) of Feb. 8, 1994.
Nikkan Kogyo Shinbun (Daily Industrial News) of Feb. 16, 1994.
Catalog (unknown date of issue, receiving stamp on Feb. 7, 1994).
Seiko Epson Corporation
Strecker Gerard R.
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