The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 1979
Filed:
Nov. 11, 1977
Charles L Howlett, Lyndhurst, OH (US);
Medusa Corporation, Shaker Heights, OH (US);
Abstract
The invention relates to a high volume air sampler for sampling particulate matter in an area during a predetermined time period. It provides a structure having a vertically movable roof which may be raised to expose a filter paper during a sampling period and thereafter be lowered to seal the filter paper enclosure at the end of the sampling period. The roof is mounted on drive screws which serve to raise the roof at the start of the sampling period and to lower the roof at the end of the sampling period. A gear reducer and reversible motor serve to turn the drive screws through a chain and sprockets connected to such drive screws. A timer initiates the start of the sampling period and starts the reducer and motor which in turn through the drive screws, chain and sprocket assembly raises the roof of the high volume sampler. When the roof reaches its uppermost position a limit switch turns on a vacuum fan motor which thereby causes particulate to collect on the filter paper. At the end of the pre-set period the gear reducer and motor lower the roof, a second limit switch shuts off the vacuum fan motor, and the roof isolates the filter paper from further particulate fallout.