Back to results
US 4,858,478 AGranted
Bellows type hand-operated air sampling pump
AssigneeMine Safety Appliances Company
InventorsRobert S. Kush, Clayton J. Bossart
Life of this patent
Estimating the term…
Abstract
A hand-held air sampling pump can be operated with one hand to consistently sample an exact, predetermined volume of air by causing a bellows to compress and then elongate to form a vacuum inside of the bellows to draw an air sample through a detector tube and into the bellows.
Claims3
A sampling pump comprising:
- a. a bellows having a flexible airtight sleeve that encompasses a return spring and a plurality of rigid concentric stabilization rings and having a first and second opening at a first end;
- b. a rigid frame positioned around the outer perimeter of said bellows, having a hollow sleeve at one end adapted to receive and position a plunger rod while permitting movement of said rod therethrough, a handgrip means extending from said sleeve to enable the pump to be held and said plunger rod to be moved with one hand;
- c. a compression plate attached to a second end of said bellows that is rigidly attached to said plunger rod at the center of said plate;
- d. a retaining means suitable for receiving and retaining a colorimetric detector tube positioned at said first bellows opening;
- e. a check valve positioned to permit air flow into said bellows through said first opening of said bellows while preventing air flow out of said bellows;
- and,
- f. a second check valve positioned to permit air flow out of said second opening of said bellows while preventing air flow into said bellows.
4 more elements
Dependencies are inferred from the claim text.