Manual vacuum producing system having vacuum pressure indicator

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 33/00 (2006.01) A61B 17/56 (2006.01) A61F 2/46 (2006.01) F04B 37/10 (2006.01) F04B 39/00 (2006.01) B01F 13/00 (2006.01)

Patent

CA 2240839

A vacuum system (5) comprising a vacuum pump (10) and a vacuum indicator (15). The vacuum pump comprises a cylinder; a piston disposed in the cylinder (50); a piston rod (60) fixed at a first end to the piston and extending through an end of the cylinder, the rod being movable axially and reciprocally to move the piston in the cylinder axially and reciprocally in first and second opposite directions; a sealing ring (85) disposed on and around the piston and in engagement with an inside wall of the cylinder throughout a periphery of the sealing ring; and stog means extending radially outwardly from the piston, the stop means including proximal stop means proximate a proximal surface of the piston and distal stop means proximate a distal surface of the piston, the sealing ring being axially movable between the proximal and distal stop means; the piston having an axially-extending groove therein, the groove extending from proximal of the distal stop means to proximal of the proximal stop means.

L'invention concerne un système de dépression (5) doté d'une pompe à vide (10) et d'un indicateur de vide (15). La pompe à vide comprend un cylindre; un piston à l'intérieur du cylindre (50); une tige (60) de piston fixée à une première extrémité du piston, s'étendant par une extrémité du cylindre et susceptible d'être mise en mouvement axial et alternatif pour déplacer le piston dans le cylindre de manière axiale et alternative dans un sens puis dans le sens inverse; un anneau d'étanchéité (85) en position périphérique sur le piston, en prise avec une paroi intérieure du cylindre sur le pourtour annulaire; et des butées qui s'étendent radialement vers l'extérieur depuis le piston, certaines d'entre elles étant proximales, proches d'une surface proximale du piston, et d'autres étant distales, proches d'une surface distale de piston, avec une possibilité de mouvement axial de l'anneau d'étanchéité entre les butées proximales et distales; il existe enfin sur le piston une gorge axiale s'étendant depuis un emplacement proche des butées distales vers un emplacement proche des butées proximales.

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