Patent Application
20090065092
The present invention is directed to powder dispensing devices, and more particularly, to a valve assembly for use in an apparatus for dispensing a flowable, granulated powder.
Devices are known for filling receptacles with granular, particulate, and/or powdered materials that are transported from a storage container into a receptacle. Dispensing mechanisms for these devices range from open containers with scoops to coin operated machines. Granular matter, such as sand, can be provided in various colors and can be dispensed from storage containers to produce a decorative art form in a transparent receptacle. Likewise, granular food products, such as powdered candy, can also be dispensed to produce a decorative art form in a receptacle with the added attraction of being edible. However, granular or powdered food products need special care to avoid contamination. Thus, there is a need for a dispensing system for granular food materials that will avoid contamination between the dispensing mechanism and the receptacles that receive the granular food material.
The present invention is a powder dispenser comprising a powder container having an opening in a lower end thereof, a powder receptacle having a flange, and a flow control assembly having upper pivotable flow control arms biased against each other, lower pivotable activation arms biased towards each other, and connecting members for connecting the flow control arms to the activation arms for concomitant movement, wherein the receptacle flange is operable to engage the activation arms to pivot the activation arms away from each other and thereby pivot the flow control arms away from each other so that powder is allowed to flow through the flow control assembly into the receptacle. The dispenser may further comprise an agitator connected to one of the flow control arms and extending into the container opening, wherein the agitator is operable to agitate the powder when the flow control arms are pivoting towards or away from each other.
These and other features of the invention will become apparent from the following detailed description of the preferred embodiment of the invention.
The present invention, shown in
The valve assembly 25 comprises first and second pivotable flow control arms 26, each having a first end 26a and a second end 26b having a hole 27 therethrough. The first ends 26a of the flow control arms 26 are biased against each other by a spring 30, thereby preventing powder from flowing out of the container 11. The valve assembly 25 further comprises first and second pivotable activation arms 28, each having a first end 28a and a second end 28b having a hole 29 therethrough. The first ends 28a of the pivotable activation arms 28 are biased towards each other as a result of the action of spring 30. The valve assembly 25 further comprises first and second connecting members 29 for connecting the flow control arms 26 to the activation arms 28 for concomitant movement. Each connecting member 29 is connected to a flow control arm 26 and an activation arm 28 via holes 27 and 29.
The apparatus 10 preferably further comprises an agitator arm 35 having a first end 35a connected to one of the flow control arms 26 and a second end 35b extending into the container 11 through the opening 12, wherein the agitator arm 35 is operable to agitate the powder to enhance flow when the flow control arms 26 are pivoting towards or away from each other.
In operation, the flange 22 of the receptacle 20 is inserted into the slot 19 of the housing 15 until the activation arms 28 are engaged. As the receptacle 20 is pushed further into the slot 19, the open end 21 of the receptacle 20 is aligned under the flow opening 18 of the housing 15 and the flange 22 acts as a cam to push the activation arms 28 apart. As the activation arms 28 pivot apart, the connecting members 29 pivot the flow control arms 26 apart, thereby allowing powder to flow from the container 11, through the valve assembly 25, and out through the flow opening 18 into the receptacle 20. When the receptacle 20 is removed, the spring 30 biases the flow control arms 26 back into engagement so that the powder flow is terminated. As the flow control arms 26 pivot between open and closed positions, the agitator arm 35 is activated to agitate the powder to enhance flow and prevent clumping of the powder.
While the invention has been shown and described in some detail with reference to a specific exemplary embodiment, there is no intention that the invention be limited to such detail. On the contrary, the invention is intended to include any alternative or equivalent embodiments that fall within the spirit and scope of the invention as described above and as recited in the appended claims.
