Vacuum system
First Claim
1. A demand operated vacuum pump comprising:
- a. a venturi tube;
b. means including a passageway for supplying compressed gas to said venturi tube;
c. means for forming a vacuum chamber;
d. conduit means for exhausting the air from said vacuum chamber and connected to the throat of said venturi tube;
e. unitary piston means disposed in said vacuum chamber and capable of moving from one end position to the other, said piston means having a valving portion capable by said moving of opening and closing said passageway to permit or prevent the compressed gas from entering said venturi tube;
f. spring means associated with said piston means and disposed in said housing for urging said piston into one end position, while an existing vacuum tends to urge said piston in the other end position, thereby to close off the supply of compressed gas; and
g. means coupled to said piston means for causing said piston means to rapidly snap from one end position to the other.
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Accused Products
Abstract
A vacuum pump having a mechanically operated plunger or piston which is so arranged as to either fully open or fully close a supply of compressed gas. The compressed gas flows through a venturi tube to create a vacuum. This vacuum in turn causes the atmospheric pressure to urge the plunger against a spring force to close the connection between the compressed gas and the venturi tube. This will maintain the vacuum pressure between two predetermined limits. As soon as the pressure in the vacuum chamber rises above a predetermined value the compressed gas supply is opened again to reduce the gas pressure in the vacuum chamber. There are also disclosed a new desoldering tool, a power cylinder, clamping fixtures and suction cups operable with the vacuum pump of the invention.
29 Citations
16 Claims
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1. A demand operated vacuum pump comprising:
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a. a venturi tube; b. means including a passageway for supplying compressed gas to said venturi tube; c. means for forming a vacuum chamber; d. conduit means for exhausting the air from said vacuum chamber and connected to the throat of said venturi tube; e. unitary piston means disposed in said vacuum chamber and capable of moving from one end position to the other, said piston means having a valving portion capable by said moving of opening and closing said passageway to permit or prevent the compressed gas from entering said venturi tube; f. spring means associated with said piston means and disposed in said housing for urging said piston into one end position, while an existing vacuum tends to urge said piston in the other end position, thereby to close off the supply of compressed gas; and g. means coupled to said piston means for causing said piston means to rapidly snap from one end position to the other. - View Dependent Claims (2, 3)
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4. A demand-operated vacuum pump comprising:
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a. a main housing; b. a venturi tube in said housing; c. means for supplying a gas at relatively high pressure to said venturi tube; d. a plenum in said housing; e. means for connecting said plenum to the throat of said venturi tube to reduce the pressure in said plenum, said means for supplying high pressure gas to said venturi tube including an opening; f. a unitary piston plunger movable in said housing, said plunger having a first valving portion for opening or closing said opening, thereby to permit said compressed gas to flow to said venturi tube or to block the gas, said plunger having a disk-like portion, one side of which is exposed to the pressure in said plenum; g. spring means for loading said plunger and urging it away from said opening, whereby said plunger can overcome said spring pressure when the pressure in said plenum is reduced beyond a predetermined value; and h. means coupled to said plunger for providing a snap action to move said plunger rapidly into and out of contact with said opening. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification