Boots – shoes – and leggings
Patent
1984-12-21
1987-06-23
Chin, Gary
Boots, shoes, and leggings
364557, 73 492, 73 52, 374 4, G01M 332, G01K 1300, G01K 1900
Patent
active
046758348
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
The subject matter of the present application is related to applicant's prior copending applications Ser. No. 666,082 filed Oct. 29, 1984, for "Leakage Inspection Method", and Ser. No. 674,908 filed Nov. 9, 1984, for "Pressure Variation Detecting Type Leakage Inspection Equipment".
TECHNICAL FIELD
The present invention relates to leakage inspection equipment by which products or parts which are required to be free from a fluid leak or to limit a fluid leak within a prescribed range while in use, such as instruments or containers handling fluids, are inspected one after another in their production process to judge whether they are non-defective or defective.
BACKGROUND ART
Various instruments such as an engine cylinder, a container of a waterproof watch, a gas appliance and so forth are required to be completely free from a gas or liquid leak or to suppress the leakage within a specified limit. To meet this requirement, such instruments or parts are checked for leakage in their manufacturing process.
As leakage inspection equipments for such a leakage test, pressure variation detecting type leakage inspection equipments have already been put to practical use. The leakage inspection equipments of this type can be roughly divided into two types of inspection systems, one of which applies a positive or negative fluid pressure to the interior of an article under inspection and detects whether a change in the pressure is within a prescribed range, thereby judging whether the article under inspection is non-defective or defective, and the other of which applies a positive or negative fluid pressure to each of the articles under inspection and a comparison tank and measures a variation in the differential pressure therebetween, thereby judging whether the article under inspection is non-defective or defective.
In either system, a fluid pressure is applied to the article under inspection, a variation in the pressure or differential pressure is monitored for a certain period of time after the fluid pressure reached a predetermined value, and the article being inspected is judged non-defective or defective depending upon whether the variation in the pressure or differential pressure is within a prescribed range. In such an inspection, air is usually employed as the fluid. In the case of using pneumatic pressure as the fluid pressure, an error may be introduced into the measured pressure value or differential pressure value owing to various factors such as the temperature of the article under inspection, ambient temperature, humidity, water content adhering to the article under inspection and its slight deformation by pressure.
If the error value is always constant, no particular trouble occurs since it is necessary only to hold the reference value for judgement constant. Since the error contained in the pressure or differential pressure value is caused by the abovesaid various factors, however, a change in each factor incurs a variation in the error value. Accordingly, in the case of continuously performing the inspection, it is necessary that the reference value for judgement be frequently modified in response to variations in the error value.
As a method for automatically changing the reference value in response to variations in the error value, the present applicant has previously proposed pressure variation detecting type leakage inspection equipment (PCT/JP 83/00085) in applicant's prior copending U.S. application Ser. No. 674,908.
The pressure variation detecting type leakage inspection equipment proposed in said U.S. application Ser. No. 674,908 is provided with a memory for storing a predetermined number of measured data on inspected articles judged non-defective, calculating means for calculating a mean value of the measured data stored in the memory and data correcting means for correcting measured data through using the mean value, obtained by the calculating means, as a correction value for the measured data on the article being inspected, and is adapted so t
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Chin Gary
Juffernbruch Daniel W.
Kabushiki Kaisha Kosumo Keiki
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