Fluent material dispenser having ooze prevention means

Claim 2

In a dispenser: a container having an outlet; piston means in said container; means movable in one direction for shifting said piston means forwardly in said container and against a substance in said container to force the substance through said outlet; energy storable means operatively connected to said movable means and adapted tp have energy stored therein in response to movement of said movable means in said one direction, said energy storable means being constructed and arranged to move said movable means in the direction opposite said one direction and said piston rearwardly in said cylinder in response to release of said movable means and the subsequent release of the energy stored in said energy storable means.

Claim 3

In a dispenser as defined in claim 1; said movable means including an operating member located at least partially externally of said container, and instrumentalities operatively connected to said operating member and piston means and responsive to turning of said operating member in one direction for shifting said piston means forwardly in said container.

Claim 4

In a dispenser as defined in claim 1; said movable means including an operating member located at least partially externally of said container, a first threaded member operatively connected to said operating member, a second threaded member meshing with said first threaded member and operatively connected to said piston means, whereby turning of said first threaded member by said operating member feeds said piston means longitudinally forwardly in said container; said energy storable means being operatively connected to said first threaded member and having energy stored therein upon turning of said first threaded member; release of said operating member enabling said energy storable means to reversely turn said first threaded member.

Claim 5

In a dispenser: a container having an outlet; piston means in said container; means movable in one direction for shifting said piston means forwardly in said container and against a substance in said container to force the substance through said outlet; energy storable means operatively connected to said movable means and adapted to have energy stored therein in response to movement of said movable means in said one direction, whereby release of said movable means enables said energy storable means to move said movable means in the opposite direction and cause said movable means to shift said piston means rearwardly in said container; said movable means including an operating member located at least partially externally of said container, a first threaded member operatively connected to said operating member, a second threaded member meshing with said first threaded member and operatively connected to said piston means, whereby turning of said first threaded member by said operating member feeds said piston means longitudinally forwardly in said container; said energy storable means comprising a spring device operatively connected to said first threaded member and frictionally engageable with said container, said spring device having energy stored therein upon turning of said first threaded member; release of said operating member enabling said spring device to reversely turn said first threaded member.

Claim 6

In a dispenser: a container having an outlet; piston means in said container; means movable in one direction for shifting said piston means forwardly in said container and against a substance in said container to force the substance through said outlet; energy storable means operatively connected to said movable means and adapted to have energy stored therein in response to movement of said movable means in said one direction, whereby release of said movable means enables said energy storable means to move said movable means in the opposite direction and cause said movable means to shift said piston means rearwardly in said container; said movable means including an operating member located at least partially externally of said container, a first threaded member operatively connected to said operating member, a second threaded member meshing with said first threaded member and operatively connected to said piston means, whereby turning of said first threaded member by said operating member feeds said piston means longitudinally forwardly in said container; said energy storable means comprising a spring device operatively connected to said first threaded member and frictionally engageable with said container, said spring device having energy stored therein upon turning of said first threaded member; release of said operating member enabling said spring device to reversely turn said first threaded member.

Claim 7

In a dispenser as defined in claim 4; and means providing a lost motion driving connectiOn between said operating member and portion of said spring device frictionally engaging said container to limit the energy stored in said spring device upon turning of said operating member.

Claim 8

In a dispenser: a container having an outlet; piston means in said container; means movable in one direction for shifting said piston means forwardly in said container and against a substance in said container to force the substance through said outlet; energy storable means operatively connected to said movable means and adapted to have energy stored therein in response to movement of said movable means in said one direction, whereby release of said movable means enables said energy storable means to move said movable means in the opposite direction and cause said movable means to shift said piston means rearwardly in said container; said movable means including an operating member located at least partially externally of said container, a first threaded member operatively connected to said operating member, a second threaded member meshing with said first threaded member and operatively connected to said piston means, whereby turning of said first threaded member by said operating member feeds said piston means longitudinally forwardly in said container; said energy storable means being operatively connected to said first threaded member and having energy stored therein upon turning of said first threaded member; release of said operating member enabling said energy storable means to reversely turn said first threaded member; and means providing a lost motion driving connection between said operating member and energy storable means to limit the energy stored therein upon turning of said operating member.

Claim 9

In a dispenser: a container having an outlet; piston means in said container; means movable in one direction for shifting said piston means forwardly in said container and against a substance in said container to force the substance through said outlet; energy storable means operatively connected to said movable means and adapted to have energy stored therein in response to movement of said movable means in said one direction, whereby release of said movable means enables said energy storable means to move said movable means in the opposite direction and cause said movable means to shift said piston means rearwardly in said container; said movable means including an operating member located at least partially externally of said container, a first threaded member operatively connected to said operating member, a second threaded member meshing with said first threaded member and operatively connected to said piston means, whereby turning of said first threaded member by said operating member feeds said piston means longitudinally forwardly in said container; said energy storable means being operatively connected to said first threaded member and having energy stored therein upon turning of said first threaded member; release of said operating member enabling said energy storable means to reversely turn said first threaded member; and means providing a lost motion driving connection between said operating member and energy storable means to limit the energy stored therein upon turning of said operating member.

Claim 10

In a dispenser: a container having a forward outlet; piston means movable longitudinally in said container; a threaded shaft secured to said piston for axial movement therewith and extending rearwardly therefrom; a threaded drive member meshing with said shaft; an operating member operatively connected to said drive member for rotating said drive member in one direction to feed said drive shaft and piston means forwardly in said container and said piston means against a substance in said container to force the substance through said outlet; a spring device having one portion operatively engaging said drive member and another portion operatively engaging said container, whereby rotation of said drive member by said operating member in said one direction energizes said spring device and causes said spring device to reversely rotate said drive member in the opposite direction upon release of said operating member to move said drive shaft and piston means rearwardly in said container.

Claim 11

In a dispenser: a container having a forward outlet; piston means movable longitudinally in said container; a threaded shaft secured to said piston for axial movement therewith and extending rearwardly therefrom; a threaded drive member meshing with said shaft; an operating member operatively connected to said drive member for rotating said drive member in one direction to feed said drive shaft and piston means forwardly in said container and said piston means against a substance in said container to force the substance through said outlet; a spring device having one portion operatively engaging said drive member and another portion operatively engaging said container, whereby rotation of said drive member by said operating member in said one direction energizes said spring device and causes said spring device to reversely rotate said drive member in the opposite direction upon release of said operating member to move said drive shaft and piston means rearwardly in said container.

Claim 12

In a dispenser as defined in claim 7; said one portion of said spring device being coupled to said drive member, said another portion of said spring device frictionally engaging said container to resist turning of said another portion in said container.

Claim 13

In a dispenser as defined in claim 7; said spring device comprising a helical spring.

Claim 14

In a dispenser as defined in claim 7; said spring device comprising a helical spring; said one portion of said spring device being coupled to said drive member, said another portion of said spring device frictionally engaging said container to resist turning of said another portion in said container.

Claim 15

In a dispenser as defined in claim 7; said one portion of said spring device being coupled to said drive member, said another portion of said spring device frictionally engaging said container to resist turning of said another portion in said container; and means providing a lost motion driving connection between said operating member and said another portion of said spring device to limit the energy stored in said spring device upon rotating of said operating member in said one direction.

Claim 16

In a dispenser as defined in claim 7; said spring device comprising a helical spring; said one portion of said spring device being coupled to said drive Member, said another portion of said spring device frictionally engaging said container to resist turning of said another portion in said container; and means providing a lost motion driving connection between said operating member and said another portion of said spring device to limit the energy stored in said helical spring upon rotating of said operating member in said one direction.