Source of vacuum and device for maintaining a negative pressure in an enclosure
OwnerAndre A. C. Emeritinventor
Life of this patent
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Abstract
The source of vacuum comprises a tubular body in which a piston which is combined with a piston rod is axially slidable. A seal is interposed between the rod and the body where the rod extends out of the body. A suction orifice is provided which is on the axis of or in the vicinity of the axis of the body and parallel to the axis. An arrangement is provided for holding the body and urging the piston to one end of the body in one hand. A communication passage is provided for putting the suction orifice in communication with a chamber defined between the piston and the body when the piston is depressed relative to the body.
Claims13
A source of vacuum comprising:
- a wall laterally defining a tubular body which has a first end portion and a second end portion and an axis and defines an inner chamber, a piston slidable in the body, a rod connected to the piston, an aperture in the body, the rod extending through the aperture, sealing means interposed between the aperture and the rod, means defining a suction orifice located at least in the vicinity of and parallel to said axis, means for depressing the piston toward the second end portion of the body, and communication means for putting the suction orifice suddenly in communication with a part of said chamber in the body which is defined by the first end portion and the piston when the piston is depressed relative to the body toward said second end portion and reaches a predetermined position.
A source of vacuum comprising:
- a wall laterally defining a tubular body which has a first end portion and a second end portion and an axis and defines an inner chamber, two radial ears in the vicinity of the first end portion, an aperture in the body, means defining a suction orifice formed in the second end portion and located at least in the vicinity of and parallel to said axis, a piston slidable in the body, a rod connected to the piston, the rod extending through the aperture, sealing means interposed between the aperture and the rod, means for holding the body and for depressing the piston toward the second end portion of the body in one hand, and communication means for putting the suction orifice suddenly in communication with a part of said chamber in the body which is defined by the first end portion and the piston when the piston is depressed relative to the body toward said second end portion and reaches a predetermined position.
Dependencies are inferred from the claim text.