Hand held vacuum device

A device for forming a vacuum in a container, comprising:

• a housing adapted to be held by hand;
• a pump for evacuating fluid from the container;
• a motor for driving said pump;
• means for communicating a motive force from said motor to said pump;
• control means for controlling operation of said motor;
• and
• a vacuum sensor, including:
• a membrane capable of moving between a first fixed position and a second fixed position;
• a chamber having a first pressure that decreases with a decrease in a pressure within the container, said first pressure exerting a force on said first side of said membrane;
• a second pressure for exerting a force on a second side of said membrane opposite said first side;
• wherein said membrane moves from said first fixed position to said second fixed position when forces biasing said membrane into said second fixed position become greater than forces opposing movement of said membrane into said second fixed position.

A device for forming a vacuum in a container, comprising:

• a device housing adapted to be held by hand;
• a pump for evacuating fluid from the container;
• a motor for driving said pump;
• means for communicating a motive force from said motor to said pump;
• control means for controlling operation of said motor;
• and
• a vacuum sensor, including:
• a sensor housing;
• a cover mating with said housing;
• a first electrically conductive component;
• a second electrically conductive component;
• a third electrically conductive component;
• an electrically conductive membrane capable of moving between a first position where said electrically conductive membrane electrically couples said third electrically conductive component to said first electrically conductive component, and a second position where said electrically conductive membrane electrically couples said third electrically conductive component to said second electrically conductive component, said membrane being biased into said first position;
• a chamber having a first pressure that decreases with a decrease in pressure within the container, said first pressure exerting a force on said first side of said membrane;
• a second pressure for exerting a force on a second side of said membrane opposite said first side;
• wherein said membrane moves from said first position to said second position when forces biasing said membrane into said second position become greater than forces biasing said membrane into said first position.

A switch for switching between a first state and a second state upon a change in a reference pressure, comprising:

• a housing;
• a cover mating with said housing;
• a membrane positioned within a space defined by said housing and cover, said membrane capable of moving between a first position where the first state is enabled, and a second position where the second state is enabled;
• a chamber defined between said membrane and said cover, said chamber having a first pressure that changes with a change in the reference pressure, said first pressure exerting a force on said first side of said membrane;
• and
• a second pressure for exerting a force on a second side of said membrane opposite said first side;
• wherein said membrane snaps from said first position to said second position when forces biasing said membrane into said second position become greater than forces biasing said membrane into said first position;
• and
• wherein said cover is capable of occupying a first location with respect to said housing which exerts a first force on said membrane opposing said bias of said membrane into said first position, and said cover capable of occupying a second location with respect to said housing which exerts a second force on said membrane opposing said bias of said membrane into said first position, said first force being greater than said second force, such that said membrane is biased into said first position to a greater extent when said cover occupies said first location as compared to when said cover occupies said second location, and
• wherein said cover and said housing are provided with mating threaded surfaces, said cover moving between said first and second locations with respect to said housing by rotating said cover with respect to said housing.

A device for forming a vacuum in a container, comprising:

• a device housing adapted to be held by hand;
• a pump for evacuating fluid from the container;
• a motor for driving said pump;
• means for communicating a motive force from said motor to said pump;
• control means for controlling operation of said motor;
• and
• a vacuum sensor, including:
• a sensor housing;
• a cover mating with said housing;
• a first electrically conductive component;
• a second electrically conductive component;
• a membrane capable of moving between a first position where said membrane is electrically coupled to said first electrically conductive component, and a second position where said membrane is electrically coupled to said second electrically conductive component, said membrane being biased into said first position;
• a chamber having a first pressure that decreases with a decrease in pressure within the container, said first pressure exerting a force on said first side of said membrane;
• a second pressure for exerting a force on a second side of said membrane opposite said first side;
• wherein said membrane moves from said first position to said second position when forces biasing said membrane into said second position become greater than forces biasing said membrane into said first position;
• and
• said cover capable of occupying a first location with respect to said housing to exert a first force on said membrane opposing said bias of said membrane into said first position, and said cover capable of occupying a second location with respect to said housing to exert a second force on said membrane opposing said bias of said membrane into said first position, said first force being greater than said second force, such that said membrane is biased into said first position to a greater extent when said cover occupies said first location as compared to when said cover occupies said second location.

A switch for switching between a first state and a second state upon a change in a reference pressure, comprising:

• a housing;
• a cover mating with said housing;
• a membrane capable of moving between a first position where the first state is enabled, and a second position where the second state is enabled, said membrane being biased into said first position;
• a chamber having a first pressure that changes with a change in the reference pressure, said first pressure exerting a force on said first side of said membrane;
• a second pressure for exerting a force on a second side of said membrane opposite said first side;
• wherein said membrane moves from said first position to said second position when forces biasing said membrane into said second position become greater than forces opposing movement of said membrane into said second position;
• and
• said cover capable of occupying a first location with respect to said housing to exert a first force on said membrane opposing said bias of said membrane into said first position, and said cover capable of occupying a second location with respect to said housing to exert a second force on said membrane opposing said bias of said membrane into said first position, said first force being greater than said second force, such that said membrane is biased into said first position to a greater extent when said cover occupies said first location as compared to when said cover occupies said second location, said cover and said housing provided with mating threaded surfaces, said cover moving between said first and second locations with respect to said housing by rotating said cover with respect to said housing.