Dispenser apparatus

Claim 2

A dispenser apparatus comprising a housing, said housing including a chamber for holding a sample and said chamber having a bore therein and a port, a movable member mounted in said bore for reciprocating movement, rack and pinion gearing means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position.

Claim 3

A dispenser apparatus comprising a housing, said housing including a chamber for holding a sample and said chamber having a port, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position, said means to iNcrease pressure in said chamber including a blower and means to connect said blower to said chamber.

Claim 4

A dispenser apparatus comprising a housing, said housing including a chamber for holding a sample and said chamber having a port, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position, said means to iNcrease pressure in said chamber including a blower and means to connect said blower to said chamber.

Claim 5

The apparatus as claimed in claim 2 wherein said member has a bypass portion and movement of said member to a third position opens said bypass portion to provide communication between said blower and said chamber.

Claim 6

A dispenser apparatus comprising a housing, said housing including a chamber for holding a sample and said chamber having a port, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position, said means to increase the pressure in said chamber including a source of pressure, a passage between said source of pressure and said chamber and valve means responsive to movement of said member for controlling the flow through said passage.

Claim 7

A dispenser apparatus comprising a housing, said housing including a chamber for holding a sample and said chamber having a port, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position, said means to increase the pressure in said chamber including a source of pressure, a passage between said source of pressure and said chamber and valve means responsive to movement of said member for controlling the flow through said passage.

Claim 8

The apparatus as claimed in claim 4 wherein said valve means includes a bypass groove in said member and further including a cooperating seal member in said housing that normally engages said member in sealing relation so that, when said member is moved to a third position, said bypass groove is juxtaposed with said seal member and a path of communication is provided between said source of pressure and said chamber.

Claim 9

A dispenser apparatus comprising a housing, a replaceable member secured to the end of said housing and defining a chamber for holding a sample, said replaceable member being conical in configuration and having a port formed at the tip of said conical member, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position.

Claim 10

A dispenser apparatus comprising a housing, a replaceable member secured to the end of said housing and defining a chamber for holding a sample, said replaceable member being conical in configuration and having a port formed at the tip of said conical member, a movable member coupled to said housing, means to move said member relative to said chamber from a first position to a second position to aspirate material into said chamber through said port and to move said member from said second position toward said first position to dispense material from said chamber through said port, and means to increase the pressure in said chamber to supplement the dispensing action produced by the movement of said member from said second position toward said first position.

Claim 11

The apparatus as claimed in claim 6 wherein said housing has a bore therein, said movable member is mounted in said bore for reciprocating movement, and said means to move said member includes a reversible electric motor coupled to said movable member by rack and pinion gearing.

Claim 12

The apparatus as claimed in claim 7 wherein said means to increase pressure in said chamber includes a blower and means to connect said blower to said chamber.

Claim 13

The apparatus as claimed in claim 8 wherein said valve means includes a bypass groove in said member and further including a cooperating annular seal member in said housing that normally engages said member in sealing relation so that when said member is moved to a third position, said bypass groove is juxtaposed with said seal member and a path of communication is provided between said blower and said chamber.