Incremental dispensing device

A method for dispensing a viscous product from a dispensing device, comprising:

• providing a receiving and dispensing means in the dispensing device with viscous product,
• biasing an actuating piston and a washer into an initial position;
• applying fluid to a portion of an actuating chamber to increase the pressure within the chamber and force the actuating piston against its bias from the initial position to an extended position;
• engaging and incrementally moving the washer off-center with the actuating piston said off-center washer grabbing and moving a push rod in a forward direction;
• moving a drive piston connected to the push rod in the forward direction within said receiving and dispensing means to bear against the viscous product,
• dispensing the viscous product from the dispensing device, and
• manually grasping and moving said push rod in a reverse direction such that said drive piston also moves in the reverse direction in said receiving and dispensing means.

A fluid operated dispensing device, comprising:

• receiving means adapted to receive and dispense a viscous product;
• drive means disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means;
• an actuating chamber;
• an actuating piston adapted to reciprocate between an initial position and an extended position within said actuating chamber, said actuating piston having means in contact with said drive means to incrementally move said drive means;
• biasing means normally urging said actuating piston to its initial position;
• means for selectively supplying fluid to a portion of the actuating chamber to increase the pressure within the chamber and drive the actuating piston from its initial position to its extended position, said means for selectively supplying fluid comprising a first and second valve assembly, said first and second valve assemblies including valve means to selectively supply fluid from said fluid source to the actuating chamber, and means to selectively exhaust said fluid from said portion of the actuating chamber to allow said actuating piston to return from its extended position to its initial position whereby each activation of said actuating piston incrementally moves said drive means.

A method for dispensing a viscous product from a dispensing device, comprising:

• providing a receiving and dispensing means in the dispensing device with viscous product,
• biasing in actuating piston and a washer into an initial position;
• selectively applying fluid through at least one of a pair of valve assemblies to a portion of an actuating chamber to increase the pressure within the chamber and force the actuating piston against its bias from the initial position to an extended position, each of said pair of valve assemblies being capable of applying fluid to a separate portion of the actuating chamber;
• engaging and incrementally moving the washer off-center with the actuating piston said off-center washer grabbing and moving a push rod;
• moving a drive piston connected to the push rod within said receiving and dispensing means to bear against the viscous product, and
• dispensing the viscous product from the dispensing device.

A fluid operated dispensing device, comprising:

• a receiving means adapted to receive and dispense a viscous product,
• a drive means disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means,
• an actuating chamber,
• a first piston adapted to reciprocate between an initial and an extended position within the actuating chamber, said first piston having means in contact with said drive means to incrementally move the drive means within the receiving means,
• means for applying fluid to a portion of the actuating chamber to move the first piston within the actuating chamber, said means for applying fluid including a first valve assembly having a second piston and a valve ball disposed within a valve chamber, and a second valve assembly having a third piston and a second valve ball disposed within a second valve chamber, said second piston including an exhaust passage formed therein adapted to allow fluid to exhaust from the dispensing device to allow said first piston to return from its extended position to its initial position.

A fluid operated dispensing device, comprising:

• receiving means adapted to receive and dispense a viscous product;
• a drive means comprising a drive piston and a push rod disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means;
• an actuating chamber;
• an actuating piston adapted to reciprocate between an initial position and an extended position within said actuating chamber, said actuating piston having means in contact with said push rod to incrementally move said drive piston and said push rod within said receiving means, said means in contact with said push rod including a washer located around said push rod and adapted to be drive off center and against said push rod by said activating piston;
• biasing means normally biasing said actuating piston to its initial position, said biasing means including a spring located around said push rod in contact with said washer and adapted to bias said washer and said actuating piston into said initial positions;
• means for selectively supplying fluid to a portion of the actuating chamber to increase the pressure within the chamber and drive the actuating piston against its bias from its initial position to its extended position, and means to selectively exhaust said fluid from said portion of the actuating chamber to allow said actuating piston to return from its extended position to its initial position, whereby each activation of said actuating piston incrementally moves said drive means.

A fluid operated dispensing device, comprising:

• a receiving means adapted to receive and dispense a viscous product,
• a drive means disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means,
• an actuating chamber,
• a first piston adapted to reciprocate between an initial and an extended position within the actuating chamber, said first piston having means in contact with said drive means to incrementally move the drive means in a forward direction within the receiving means,
• means for applying fluid to a portion of the actuating chamber to move the first piston within the actuating chamber, said means including a valve assembly having a second piston and a valve ball disposed within a valve chamber, said second piston including an exhaust passage formed therein, said exhaust passage adapted to allow fluid to exhaust from the dispensing device to allow said first piston to return from its extended position to its initial position, and
• means to allow said drive means to be moved in a reverse direction in said receiving means.

A fluid operated dispensing device, comprising:

• receiving means adapted to receive and dispense a viscous product;
• a drive means disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means;
• an actuating chamber;
• an actuating piston adapted to reciprocate between an initial position and an extended position within said actuating chamber, said actuating piston having means in contact with said drive means to incrementally move said drive means;
• biasing means normally biasing said actuating piston to its initial position;
• means for selectively supplying fluid to two separate portions of the actuating chamber comprising a pair of valve assemblies to increase the pressure within the actuating chamber and drive the actuating piston against its bias from its initial position, one of said pair of valve assemblies adapted to selectively provide fluid to one of said two separate portions of said actuating chamber, and the other of said pair of valve assemblies adapted to selectively provide fluid to the other of said two separate portions of said actuating chamber, and means to selectively exhaust said fluid from said portion of the actuating chamber to allow said actuating piston to return from its extended position to its initial position, whereby each activation of said actuating piston incrementally moves said drive means.

A fluid operated dispensing device, comprising:

• receiving means adapted to receive and dispense a viscous product;
• an actuating chamber;
• a drive means disposed at least partially within the receiving means and adapted to urge the viscous product from the receiving means, said drive means including a drive rod extending through at least a portion of said actuating chamber;
• an actuating piston adapted to reciprocate between an initial position and an extended position within said actuating chamber, said actuating piston being movable relative to and at least partially surrounding said drive means and having means in contact with said drive means to incrementally move said drive means;
• biasing means normally biasing said actuating piston to its initial position;
• means for selectively supplying fluid comprising at least one valve assembly and a fluid source, at least one of said valve assemblies having valve means for selectively supplying fluid from said fluid source to a portion of the actuating chamber to increase the pressure within the chamber and drive the actuating piston against its bias from its initial position to its extended position, and means to selectively exhaust said fluid from said portion of the actuating chamber to allow said actuating piston to return from its extended position to its initial position, whereby each activation of said actuating piston incrementally moves said drive means.