# Patent

## Title
Appliance for vacuum sealing food containers

## Abstract

An appliance for evacuating a flexible container, the appliance including a base housing and a vacuum source disposed within the base housing. A drip retainer is removeably disposed in the base and is in communication with the vacuum source. The drip retainer includes a chamber for holding material. The drip retainer further including a nozzle projecting therefrom, the nozzle is engagable with an opening of the flexible container. A cover is rotatably connected to the base and movable to a closed position to cover the nozzle.

## Background
RELATED APPLICATIONS
The present application is a divisional of application Ser. No. 11/593,681 filed on Nov. 6, 2006 which is a divisional of U.S. Pat. No. 7,131,250 issued Nov. 7, 2006 which is a continuation-in-part of U.S. Pat. No. 7,076,929 issued on Jul. 18, 2006, which is a continuation-in-part of U.S. Pat. No. 7,003,928 issued on Feb. 28, 2006, which claims priority to provisional Application Ser. No. 60/416,036 filed on Oct. 4, 2002. The foregoing applications are hereby incorporated by reference herein.


FIELD OF INVENTION
This invention relates to packaging systems. More specifically, this invention relates to an appliance for vacuum sealing various types of containers.
BACKGROUND OF THE INVENTION
Vacuum sealing appliances are used domestically and commercially to evacuate air from various containers such as plastic bags, reusable rigid plastic containers, or mason jars. These containers are often used for storing food. Vacuum sealing food packaging provides many benefits with a particular advantage of preserving the freshness and nutrients of food for a longer period of time than if food is stored while exposed to ambient air.
Typically, these appliances operate by receiving a bag, isolating the interior of the bag from ambient air, and drawing air from the interior of the bag before sealing it. One such appliance is a “Seal-A-Meal” product marketed by the Rival Company since at least 1982. This device utilized a simple nozzle to evacuate air from bags, while a single sealing door operated in conjunction with a heat-sealer to seal the bag closed. Other appliances have also been available to evacuate rigid containers such as jars.
A problem with many of these appliances is that as air is being removed from the bag or other suitable container, liquids or other particles in the container may be ingested into the vacuum source of the appliance. Ingesting liquids or other particles into the vacuum source, which is typically an electric device, may damage the vacuum source, creating less efficient drawing power or a breakdown. This is especially a problem when evacuating air from flexible containers containing liquidous food. It is therefore desirable to have a system that prevents liquids or excess particles from being ingested into the vacuum source and that is more easily cleaned.
Another problem with many of these appliances is a lack of sufficient vacuum pressure within the appliance. Prior art systems have lacked a vacuum source with enough power to draw a significant amount of air from a container.
An additional problem with many appliances is the inability to seal a container independently from the vacuuming process. A user may want to seal a container without evacuating air from the container, or a user may wish to seal a container that is not isolated from ambient air.
BRIEF SUMMARY OF THE INVENTION
The above shortcomings and others are addressed in one or more preferred embodiments of the invention described herein. In one aspect of the invention, a system for evacuating containers is provided comprising a base housing and a recess defined within the base housing. A vacuum inlet port is within the recess and is in communication with a vacuum source located within the base housing. An inner door is hinged to the base housing and sized to cover the recess when in a closed position. An outer door having a heat sealing means mounted thereon is hinged to close over the inner door. A vacuum nozzle extends at least partially between the inner and outer doors and is in communication with the recess. The inner and outer doors cooperate to retain a flexible container therebetween and around the nozzle so that the nozzle is positioned for fluid communication with an inside of the container.
In another aspect of the invention, an apparatus for sealing a plastic bag is provided. The apparatus comprises a base housing, a vacuum source mounted within the housing and a removable drip pan resting in the base and in communication with the vacuum source. A nozzle extends at least partially over the pan in communication with the vacuum source. A pair of doors is hingeably mounted to the base housing surrounding the nozzle for engaging the bag when an opening of the bag is positioned around the nozzle. A heating element mounted on one of the doors for heat-sealing the bag.
In a further aspect of the invention an appliance for evacuating a flexible container is provided. The appliance includes a base housing and a vacuum source disposed within the base housing. A drip retainer is removeably disposed in the base housing and is in communication with the vacuum source. The drip retainer includes a chamber for holding material. The drip retainer further includes a nozzle projecting therefrom, the nozzle is engagable with an opening of the flexible container. A cover is rotatably connected to the base and movable to a closed position to cover the nozzle.
In yet another aspect of the invention, an evacuable lid and container combination is provided for use with the appliance and/or system of the present invention. The lid and container combination comprises a container having an open mouth and a lid adapted to cover the open mouth to define an enclosable chamber. The lid defines a central recess, and at least one central recess passageway located within the central recess able to sustain an air flow from an upper side of the canister lid to a lower side of the canister lid. A piston assembly is mounted for reciprocal movement within the central recess, with at least one piston passageway defined within the piston assembly capable of sustaining air flow through the piston assembly. A piston pipe is configured to retain the piston within the central recess, and a knob is configured to rotate the piston assembly via the piston pipe to align the at least one central recess passageway and the at least one piston passageway.
Various other aspects of the present invention are described and claimed herein.
Advantages of the present invention will become more apparent to those skilled in the art from the following description of the preferred embodiments of the invention which have been shown and described by way of illustration. As will be realized, the invention is capable of other and different embodiments, and its details are capable of modification in various respects. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.



BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 is a perspective view of a vacuum sealing system in accordance with the present invention;
FIG. 2 is a perspective view of a vacuum sealing appliance in accordance with the present invention;
FIG. 2b is a perspective view showing the interior of the base housing;
FIG. 3 is a perspective view of a pump motor used as a vacuum source within the vacuum sealing appliance;
FIG. 4 is an exploded view of the pump motor;
FIG. 5a is a schematic view of a pressure sensor used within the vacuum sealing appliance in a first position;
FIG. 5b is a schematic view of a pressure sensor used within the vacuum sealing appliance in a second position;
FIG. 6 is a perspective view of a drip pan used within the vacuum sealing appliance;
FIG. 6a is an enlarged perspective view of a portion of the drip pan;
FIG. 7 is a partial view of the vacuum sealing appliance showing a plastic bag placed over a nozzle on an inner door for vacuuming;
FIG. 8 is a perspective view of a second embodiment of a vacuum sealing appliance in accordance with the present invention;
FIG. 9 is a perspective view of the second embodiment of the vacuum sealing appliance showing an open end of a plastic bag placed over a vacuum recess;
FIG. 10 is a perspective view of the second embodiment of the vacuum sealing appliance showing an inner door closed against a plastic bag to hold the plastic bag in position for vacuuming;
FIG. 11 is a perspective view of the second embodiment of the vacuum sealing appliance showing an outer door closed against the inner door to isolate the plastic bag from ambient air;
FIG. 12 is a side view of an adaptor of the vacuum sealing system above a mason jar;
FIG. 12a is an enlarged view of an end of the vacuum post within the adaptor;
FIG. 13 is a top view of the adaptor of the vacuum sealing system;
FIG. 14 is a side view showing the adaptor resting on a mason jar;
FIG. 15 is a perspective view of a canister of the vacuum sealing system having an exploded view of a canister lid valve assembly;
FIG. 16 is a bottom view of the canister lid valve assembly showing the central recess passageways and the piston passageways not aligned; and
FIG. 17 is a bottom view of the canister lid valve assembly showing the central recess passageways and the piston passageways aligned.
FIG. 18 is a top perspective view of an alternative embodiment of the vacuum sealing appliance of the present invention showing a cover in an open position;
FIG. 19 is a top perspective view of the vacuum sealing appliance of FIG. 1 showing the cover in the closed position and a flexible container;
FIG. 20 is cross-sectional view taken along line 20-20 of FIG. 19 with the flexible container removed;
FIG. 21 is a top perspective view of a drip retainer of the present invention;
FIG. 22 is an exploded perspective view of the drip retainer and biasing device of the present invention;
FIG. 23 is a bottom plan view of the drip retainer of FIG. 2;
FIG. 24 is a partial cross-sectional view of FIG. 20 showing the cover in an open position;
FIG. 25 is a partial cross-sectional view taken along line 25-25 of FIG. 18 showing the cover in the closed position and the drip retainer in a locked down position;
FIG. 26 is a partial cross-sectional view of FIG. 20 showing the cover in the fully closed position;
FIG. 27 is a partial cross-sectional view taken along line 27-27 of FIG. 18 showing the drip retainer in a raised position;
FIG. 28 is a partial cross-sectional view of FIG. 27 showing the drip retainer in the locked down position;
FIG. 29 is a partial cross-sectional view taken along line 29-29 of FIG. 19; and
FIG. 30 is a top plan view of the valve member of FIG. 29.



DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, this invention relates to a system for vacuum packaging or vacuum sealing containers. The basic components of the system are a vacuum sealing appliance 1, an adaptor 901, and canister lids implementing a canister lid valve assembly 1001. As shown in FIG. 2b, the vacuum sealing appliance 1 contains a vacuum source 15 and a control system 17 for the system implementing a pump 301 and a pressure sensor 501. As shown in FIG. 1, the vacuum sealing appliance 1 uses the vacuum source 15 to extract air from plastic bags and the adaptor 901 uses the vacuum source 15 to extract air from separate rigid containers such as mason jars or canisters using a canister lid valve assembly 1001.
The vacuum sealing appliance 1, shown in FIG. 2, generally consists of a base housing 2; a bag-engaging assembly 3 having a pair of clamping doors; a sealing assembly 5; a power assembly 7; a plastic bag roll and cutting assembly 9; a status display 13; and a wall mounting assembly 21 for mounting the base housing 2 to a wall. As shown in FIG. 2b, the base housing 2 is designed to contain a vacuum source 15, a control system 17, and the status display 13 for the entire vacuum sealing system, which is powered by the power assembly 7. As shown in FIG. 2, the power assembly 7 consists of an AC power cord leading from the base housing 2 and is connectable to an AC outlet.
The status display 13 is a series of lights on the base housing 2 that illuminate to indicate the current status of the vacuum sealing appliance 1. Preferably, the status display includes a light to indicate the vacuum source 15 is operating and a light to indicate that the sealing assembly 5 is operating.
The bag-engaging assembly 3 is mounted to the base housing 2 such that when the bag-engaging assembly 3 engages a plastic bag obtained from the plastic bag roll and cutting assembly 9, the vacuum source within the base housing 2 is in communication with the interior of the plastic bag to efficiently draw air from the interior of the plastic bag. Additionally, the sealing assembly 5 is partially mounted on the bag-engaging assembly 3 to form a seal in the plastic bag being evacuated.
As shown in FIG. 1, a remote canister adaptor assembly 11 is designed to communicate with the base housing 2 via hollow tubing 906 to evacuate air from a rigid container. The vacuum source within the base housing 2 may be used to create a vacuum within the rigid container. Once the adaptor 901 of the remote canister assembly 11 is removed, the canister lid valve assembly 1001 may be used to seal the interior of certain rigid containers from ambient air.
The base housing 2, as shown in FIG. 2b, contains a vacuum source 15, a control system 17 implementing a pressure sensor 501, and tubing 19. The vacuum source 15, pressure sensor 501, and exterior of the base housing 2 are in fluid communication via the tubing 19 such that the vacuum source draws air from the exterior of the base housing 2 and directs the flow of air to the pressure sensor 501. The pressure sensor 501 is triggered when the airflow is above a predetermined level. When the pressure sensor 501 is triggered, the control system 17 controls the vacuum source 15 and the sealing assembly 9.
The vacuum source 15 located within the base housing 2 is preferably a vacuum pump such as the pump 301 shown in FIGS. 3 and 4, but many types of pumps can effectively be used as a vacuum source 15. The pump 301 shown in FIGS. 3 and 4 generally consists of an electric motor 302, a motor shaft 324, a motor fan blade 304, a motor eccentric wheel 306, a motor eccentric shaft 308, a pump piston rod 310, a pump piston air brake 312, a pump piston ring 314, a pump piston lock 316, a pump cavity air brake 318, a pump cylinder 320, and a pump cavity body 322.
The pump cylinder 320 attaches to the pump cavity body 322 to define a cavity chamber 334 having a slightly larger diameter than a lower portion of the pump piston rod 328. The cavity chamber 334 is designed to form seal between the pump piston rod 310 and the walls of the cavity chamber 334 and to guide the movement of the lower portion of the pump piston rod 328 as the pump piston rod head 326 moves in a circular direction during the circular rotation of the motor eccentric wheel 306.
When the vacuum pump 301 is activated, the electric motor 302 turns the motor fan blade 304 and the motor eccentric wheel 306 via the motor shaft 324, which extends out a first side 325 and a second side 327 of the electric motor 302. The motor fan blade 304 is connected to the first side 325 of the motor shaft 324 and the motor eccentric wheel 306 is connected to the second side 327 of the motor shaft 324.
The motor eccentric shaft 308 preferably extends from the motor eccentric wheel 306. The pump piston rod 310 is pivotally connected to the motor eccentric shaft 308 to allow a pump piston rod head 326 to move upwardly and downwardly within the pump cylinder 320, thus drawing air into the cavity chamber 334 and pushing air out of the cavity chamber 334 and into tubing 19 leading to the pressure sensor 501. To gate the airflow, the pump piston rod 310 itself defines a piston passageway 327 that incorporates valve assemblies to allow air to pass between a lower intake of the pump piston rod 328 and a side output of the pump piston rod 330.
At the lower portion of the pump piston rod 328, the pump piston rod 310 is in communication with the pump piston air brake 312, the pump piston ring 314, and the pump piston lock 316. The pump piston air brake 312 is specifically in communication with the piston passageway 327, allowing air to enter the piston passageway 327 at the lower portion of the pump piston rod 328, but preventing air flow in the opposite direction, from the piston passageway 327 to outside the lower portion of the pump piston rod 328.
The pump piston ring 314 consists of a rubber elastomeric material extending a sufficient distance from the lower portion of the pump piston rod 328 to allow the pump piston ring 314 to engage the walls of the cavity chamber 334 and form a seal. The pump piston lock 316 covers the pump piston ring 314 and pump piston air brake 312, and attaches to the pump piston rod 310 to hold the pump piston ring 314 and pump piston air brake 312 in place during movement of the pump piston rod 310.
An air inlet 336 is in communication with the cavity chamber 334 of the pump cylinder 320 to allow air to flow into the cavity chamber 324 at a lower side of the pump cavity body 322. The air inlet 336 is covered by the pump cavity air brake 318, which is positioned within the cavity chamber 334. The pump cavity air brake 318 allows air to flow into the pump cylinder 320 at the air inlet 336, but prevents air to flow in the opposite direction, from the pump cylinder 320 to the air inlet 336.
Air evacuated by the pump 301 is directed towards the pressure sensor 501, which is shown in FIGS. 5a and 5b. The sensor 501 generally consists of a switch housing 505, a pressure switch piston 502, a coil spring 504, a set of terminal pins 508, and a pressure switch chamber 510. The pressure switch chamber 510 is in the shape of an elongated cylinder allowing the pressure switch piston 502, which is slidably mounted within the hollow housing 505, to travel longitudinally within the pressure switch chamber 510. To guide the movement of the pressure switch piston 502, the pressure switch chamber 510 has a slightly larger diameter than the disk-like pressure switch piston 502.
The set of terminal pins 508 consists of at least two posts 516 having electrically conductive tips 518. The terminal pins 508 are located on the same interior side of the pressure switch chamber 510 as the inlet 503, spaced a distance 520 from each other so that an electric current cannot pass from the tip of one terminal pin 522 to the tip of another terminal pin 524. Additionally, each post 516 is long enough to allow the electrically conductive material at the tip 518 of each post 508 to engage the electrically conductive segment 512 of the piston 502 when no air pressure is applied to the pressure switch piston 502 and the coil spring 504 biases the piston 502 against them.
The outlet of the pump 301 is connected to the same side of the pressure switch chamber 510 as the set of terminal pins 508 such that the air flow leaving an air outlet side 534 of the pump 301, the side outlet 330 of the pump piston rod 310 in the preferred embodiment, is concentrated into the pressure switch chamber 510, directing air flow pressure on the pressure switch piston 502 in a direction of force against the force of the coil spring 504.
In general, the pressure sensor 501 receives at least a portion of air flow exhausted from the vacuum source 15 through an inlet 503 of the sensor 501. When air begins to flow into the pressure sensor 501, the pressure switch piston 502, which is slidably mounted within the hollow housing 505, changes position within the housing 505 depending on the amount of air flowing into the sensor 501. The pressure switch piston 502 is preferably disk-shaped to register with the internal contour of the housing 505, and consists of a disk of electrically conductive material 512 attached to a disk of electrically insulating material 514. The coil spring 504 engages the pressure switch piston 502 at the electrically insulating material 514 with the opposite end of the coil spring 504 engaging an interior side of the pressure switch chamber 510. The spring is mounted to bias the piston towards the inlet 503.
A micro-chip controller 506 is electrically connected to the tip 518 of each terminal pin 508 such that when the electrically conductive segment 512 of the pressure switch piston 502 is in contact with the terminal pins 508, an electric current passes from the micro-chip controller 506, through the terminal pins 508 and piston 502, and then back to the micro-chip controller 506, thus creating a constant signal. This allows the micro-chip controller 506 to detect when the pressure switch piston 502 is in a first position 530 shown in FIG. 5a or a second position 532 shown in FIG. 5b. In the first position 530 shown in FIG. 5a, the electrically conductive segment 512 of the pressure switch piston 502 is in contact with the terminal pins 508 creating a closed circuit and the constant signal to the micro-chip controller 506. In the second position 532 shown in FIG. 5b, the electrically conductive segment 512 of the pressure switch piston 502 is pushed away from the terminal pins 508 by incoming air pressure a distance such that the spring 504 is compressed. In this position, electric current cannot pass from one terminal pin 522 to another terminal pin 524 through the electrically conductive segment 512 of the pressure switch piston. 502. This position of the pressure switch piston 502 creates an open circuit resulting in the constant signal to the micro-chip controller 506 ceasing.
The outlet of the pump 301 is connected to the same side of the pressure switch chamber 510 as the terminal pins 508 such that the air flow leaving the air outlet side 534 of the pump 301, the side 330 of the pump piston rod 310 in the preferred embodiment, is concentrated into the pressure switch chamber 510, placing pressure on the pressure switch piston 502 in a direction of force against the force of the coil spring 504.
During operation, before the pump 301 is activated, the pressure switch piston 502 is in the first position 530 with the electrically conductive segment 512 in contact with the terminal pins 508. This causes a closed circuit and a constant signal to the micro-chip controller 506. Once the pump 301 is activated, air flows from the pump 301 into the pressure switch chamber 510. This air flow creates a force that pushes the pressure switch piston 502 into the second position 532 where the electrically conductive segment 512 is not in contact with the terminal pins 508. This creates an open circuit and stops current flow into the micro-chip controller 506 resulting in the constant signal to the micro-chip controller 506 ceasing, effectively informing the micro-chip controller 506 that air is being evacuated by the pump 301.
Once sufficient air is evacuated by the pump 301, the air flow from the pump 301 significantly decreases and the force on the pressure switch piston 502 is less than the force of the coil spring 504. The coil spring 504 biases the pressure switch piston 502 back into the first position 530.
The micro-chip controller 508 operates differently when receiving the new constant signal of the first position 530 depending on how the vacuum sealing apparatus 1 is being used. For example, when the pump 301 is being used to seal plastic bags, an outer door 10 of the bag-engaging assembly 3 actuates a microswitch 536, effectively causing the micro-chip controller 506 to activate a heating wire 538 and to not deactivate the pump 301 in response to a decrease in pressure within the sensor 501. When the vacuum sealing appliance 1 and the pump 301 are used in communication with the adaptor assembly 11 as discussed further below, the outer door 10 of the bag-engaging assembly 3 does not actuate the microswitch 536, thus causing the micro-chip controller 506 to deactivate the pump 301 and to not activate the heating wire 538 upon the decrease in pressure within the sensor 501.
The vacuum inlet 14 is located within a recess 16 defined on the top of the base housing 2. A removable drip pan 4 rests in the recess 16 and is in communication with the vacuum inlet 14. The removable drip pan 4 is designed to collect excess food, liquid, or other particles to avoid clogging the vacuum source 15 when extracting air from a plastic bag. Preferably, the drip pan 4 is generally made of a heat resistant, dishwasher-safe material which is easily cleaned, but any material capable of holding excess food, liquid, or other particles could be used. The heat resistant material may be a high-temperature polymer such as polycarbonate or other heat resistant materials such as lexan. A drip pan 4 made of a heat resistant material allows a user to safely place the drip pan 4 in a dishwasher for cleaning. Additionally, the removable and replaceable nature of the drip pan 4 allows continuous use of the vacuum sealing appliance through the use of multiple drip pans 4 while a user cleans some of the drip pans 4 in a dishwasher. Furthermore, in the preferred embodiment, a Micoban® additive is incorporated into the pan 4 to prevent or retard the growth of bacteria and other microorganisms. This additive is sold by Microban International, Ltd. Other additives and disinfectants may also be used, incorporated into the pan or coated thereon.
As shown in FIG. 6, the removable drip pan 4 generally consists of a lower side 600 and an upper side 608 which define an oval shape. An annular wall 623 defines a vacuum recess 612. The vacuum recess 612 is shaped as a concave region on the upper side of the drip pan 610 designed to collect food and liquids that accompany the evacuation of a plastic bag by the appliance 1 before such contaminants can enter the pump 301. The lower side 600 defines a lower-side vacuum port 602 and the upper side 608 defines an upper-side vacuum port 610 defining a hollow vacuum channel 606.
The lower-side vacuum port 602 forms a sealable fluid coupling with the port 610 on the upper side 608, positioned within the recess 612. The lower-side vacuum port 602 is surrounded by an O-ring 604, and is alignable with and insertable into the vacuum inlet 14. The O-ring 604 seals the connection between the vacuum inlet 14 and the port 602. The airtight seal allows the vacuum source 15 within the base housing 2 to efficiently draw air from the recess 612 through the lower-side vacuum port 602. Thus the vacuum source 15 is in communication with the upper-side vacuum port 610 through the vacuum channel 606 such that the vacuum source 15 efficiently draws air from the upper-side vacuum port 610 of the drip pan 4.
The upper-side vacuum port 610 extends to a height 614 above a lowermost point 615 of the vacuum recess 612 that allows a top 616 of the upper-side vacuum port 610 to sit above any liquids or food particles that may collect in the vacuum recess 612. This height 614 assists in avoiding the ingestion of any liquids or food particles into the vacuum source within the base housing 2.
After sufficient accumulation of waste, the removable drip pan 4 can be removed and the vacuum recess 612 cleaned to avoid further accumulation that could obstruct the upper-side vacuum port 610 during operation. To aid in removal, a thumb flange 603 extends from a side of the drip pan 4 with sufficient relief to allow a user to lift upwardly and easily free the drip pan 4 from the base housing 2.
To aid in the collection of excess food and liquids, the vacuum recess 612 preferably extends from approximately the center of the drip pan 4 to a first side 621 of the drip pan 4. A strip 622 made of a resilient and water-resistant elastomeric material such as rubber further defines the vacuum recess 612 by surrounding the perimeter of the vacuum recess 612 within an annular channel 624 defined by the annular wall 623. The rubber strip 622 is more pronounced in height than the annular wall 623, thus creating an airtight seal around the vacuum recess 612 when it is covered by the bag-engaging assembly 3. This seal allows the vacuum source 15 within the base housing 2 to evacuate air at the bag-engaging assembly 3 via the vacuum recess 612 and the upper-side vacuum port 610.
In order to draw air through the vacuum recess 612, the bag-engaging assembly 3 must cover the removable drip pan 4. As shown in FIG. 2, the bag-engaging assembly 3 is attached to the base housing 2. Preferably, the bag-engaging assembly 3 comprises two separately movable doors hinged to the base housing 2 such that when closed, the two doors lay against the base housing 2, each of which is configured to cover the above-described drip pan 4.
In one embodiment, the bag-engaging assembly 3 consists of a rigid inner door 6, a nozzle 8, and an outer door 10. In general, the nozzle 8 is positioned so that a plastic bag may be positioned around the nozzle 8 and the bag-engaging assembly 3 may isolate the interior of the plastic bag from ambient air so that the vacuum source 15 within the base housing 2 can draw air from the plastic bag by drawing air through the nozzle 8 on the inner door 6. The inner door 6 and outer door 10 form a clamping arrangement for engagement of the plastic bag around the nozzle 8.
The inner door 6, when closed, completely covers the drip pan 4 and the vacuum recess 16. When closed, the lower side 18 of the inner door 6 contacts and engages the rubber strip 622 surrounding the perimeter of the vacuum recess 612. To aid in forming an airtight seal with the rubber strip 622 on the removable drip pan 4, the underside 18 of the inner door 6 is overlayed by a layer of cushioned elastomeric material. Therefore, when pressure is applied to the top surface 22 of the inner door 6, the inner door 6 is compressed against the rubber strip 622 of the drip pan 4, causing the elastomeric material to engage the rubber seal and form an airtight seal between the vacuum recess 612 and the underside 18 of the inner door 4.
The nozzle 8 is preferably a one-piece hollow structure with reinforcing members 23 extending from its sides. The nozzle 8 is preferably a squared-off, tubular member defining a free flowpath between the top surface 22 of the inner door 6 and the underside 18 of the inner door 4. The nozzle 8 passes through and is attached to the inner door 6 with a lower end 24 of the nozzle 8 opening into the vacuum recess 612. In this position, the upper portion of the nozzle extends horizontally and the lower end extends vertically through an opening in the inner door 4. The lower end of the nozzle 24 is generally aligned with the vacuum recess 612 so that when an airtight seal is formed between the underside 18 of the inner door 6 and the vacuum recess 612, the nozzle 8 is in communication with the vacuum recess 612. Preferably, the lower end of the nozzle 24 is offset longitudinally from the upper-side vacuum port 610 within the vacuum recess 612. This assists the collection of liquids or excess particles in the bottom of the vacuum recess 612 instead of allowing the liquids or excess particles to pass directly to the upper-side vacuum port 610, possibly obstructing airflow. Thus, air may continuously flow towards the vacuum source 15 through the recess 612, drip pan 4, and nozzle 8 on the top surface 22 of the inner door 6. The forward end of the nozzle 8A extends forwardly from the inner door 6.
Due to the communication between the vacuum source 15 within the base housing 2 and the vacuum recess 612, the vacuum source 15 is in fluid communication with the nozzle 8 such that the vacuum source 15 can efficiently draw air from the nozzle 8. Therefore, when a flexible container, such as a plastic bag, is placed around the nozzle 8 and isolated from ambient air, the vacuum source can evacuate air from the interior of the plastic bag via the nozzle 8.
As noted above, the outer door 10 is configured to isolate an open end of a plastic bag from ambient air while the nozzle 8 on the inner door 6 is in communication with the interior of the plastic bag. An underside of the outer door 26 defines an outer door recess 28 which is slightly concave and covered with flexible, cushioned elastomeric material. When the outer door 10 is closed, the outer door recess 28 contacts and presses down on the top surface of the inner door 22, which, as noted above, includes the elastomeric material and the nozzle 8. Therefore, when the top surface of the inner door 22 and the underside of the outer door 26 are compressed over a bag placed around the nozzle 8, a generally airtight seal is formed between the two layers of cushioned elastomeric material and generally around the head of the nozzle 8 positioned between the two layers. The remainder of the edges of the open end of the plastic bag are held together tightly between the inner and outer doors 22 and 26.
To seal the plastic bag closed, a sealing assembly 5 is forwardly mounted on the underside of the outer door 26. As shown in FIG. 2, the sealing assembly 5 preferably includes a heating wire 12 mounted forwardly on the underside of the outer door 26. When closed, the heating wire 12 aligns with and overlays a rubber strip 32 mounted forwardly along the base housing 2. The heating wire 12 is mounted such that when the outer door 26 is closed, the heating wire 12 engages the plastic bag laying across the rubber strip 32 being evacuated through the nozzle 8. The heating wire 12 and rubber strip 32 are mounted forwardly to prevent the nozzle 8 from interfering with the seal.
The heating wire 12 is in communication with the pressure sensor 501 and a timing circuit such that when the micro-chip controller 506 energizes the heating wire 12 due to the pressure sensor 501 detecting a significant decrease in the amount of air leaving the vacuum source 15, the timing circuit activates the heating wire 12 for a predetermined time that is sufficient for sealing to occur. A step-down transformer 7 in the base housing 2 steps down the voltage supplied the heating wire 12.
Preferably, two openings 36 on the base housing 2 are located on either side of the rubber strip 32 to receive latches 34 on the outer door 10 to assure that the heating wire 12 evenly engages the plastic bag laying across the rubber strip 32. The latches 34 also provide hands-free operation so that once the outer door 10 latches to the base housing 2, the plastic bag is secure in the vacuum appliance 1 and no further action is needed by the user to hold the bag in place. Preferably, two release buttons 37 are located on the base housing 2 to release the latches 34 from the base housing 2.
During operation of this embodiment of the vacuum-sealing appliance 1, a plastic bag 700 is preferably first removed from the plastic bag roll and cutting assembly 9 mounted on the base housing 2. The plastic bag roll and cutting assembly 9 generally comprises a removable cutting tool 42 and a removable rod 40 fixed at both ends within a concave recess 38 defined in the base housing 2. To remove the cutting tool 42 for replacement or cleaning, a user may remove a plate 44 on the front of the base housing 2 which secures the cutting tool 42 in a track 46 running parallel to the front of the base housing 2. The track 46 allows the cutting tool 42 to slide from left to right, or from right to left along the front of the base housing 2.
The rod 40 holds a roll containing a continuous plastic sheet from which a user can unroll a desired length of plastic bag 700. The cutting tool 42 then cuts the plastic bag from the remaining roll by sliding the cutting tool 42 across the plastic bag 700 in a continuous left to right, or right to left motion.
Once removed from the plastic bag roll, the plastic bag 700 is unsealed on two ends. To seal one of the unsealed ends of the plastic bag 700, an unsealed end is placed over the rubber strip 32 of the base housing 2 and the outer door 10 is closed so that the heating wire 12 engages the rubber strip 32. No engagement with the nozzle 8 is necessary. To activate the heating wire 12, a user may momentarily depress and releases a sealing switch 48. This action activates the heating wire 12 without activating the vacuum source 15, resulting in the activated heating wire 12 fusing layers of the plastic bag 700 together, causing them to form an airtight seal. The heating wire 12 continues to fuse the layers of the plastic bag 700 until a predetermined amount of time passes and the timing circuit deactivates the heating wire 12. The plastic bag 700 is removed, resulting in a plastic bag with airtight seals on three sides.
As shown in FIG. 7, after being filled with appropriate material, the inner door 6 is closed over the recess and the drip pan 4, and the plastic bag 700 is placed around the nozzle 8. It should be noted that any type of plastic bag 700 that is sealed on three sides, partially filled with appropriate material, is gas impermeable, and consists of suitable material for heat-sealing, is appropriate for use with the system.
The outer door 10 is then closed against the inner door 6 and the base housing 2. As discussed above, pressure creates an airtight seal between the drip pan 4 and the inner door 6. Additionally, pressure creates a generally airtight seal between the inner door 6 and the outer door 10 when compressed over the plastic bag 700 placed around the nozzle 8. The latch 34 engage the hole 36 on the base housing 2 to hold the outer door 10 against the base housing 2 and sustain the pressure between the outer door 10 and the inner door 6. To activate the vacuum source, a user may momentarily depress and release a vacuum switch 50. Once activated, the vacuum source 15 draws air from the interior of the plastic bag 700 through the nozzle 8 and into the vacuum recess 612. Any liquids or other food particles evacuated from the plastic bag 700 through the nozzle 8 fall into the vacuum recess 612 of the drip pan 4 while the vacuum source 15 continues to draw air.
Once sufficient air is evacuated from the plastic bag 700, the pressure sensor 501 detects a significant decrease in the amount of air flow from the plastic bag 700. The heating wire 12 is then activated for a set period of time. The vacuum source 15 continues to draw air from the interior of the plastic bag 700 while the activated heating wire 12 fuses layers of the plastic bag 700 together, causing them to form an airtight seal. The heating wire 12 continues to fuse the layers of the plastic bag 700 until a predetermined amount of time passes and the timing circuit deactivates the heating wire 12.
After operation, the outer door 10 may be lifted and the sealed plastic bag 700 removed from the nozzle 8. Additionally, after the plastic bag 700 is removed, the inner door 6 can be easily lifted to expose the recess and the drip pan 4 removed for cleaning.
In another embodiment of the vacuum sealing appliance 1, shown in FIG. 8, the configuration of the rigid inner door 802 and the configuration of the removable drip pan 804 are modified. In the drip pan 804, the vacuum recess 806 whose perimeter is lined by the rubber strip 808 spans the entire length of the drip pan 804. As in the previous embodiment, the top-side vacuum inlet 810 is preferably located within the removable drip pan 804 such that extraneous liquid and food particles evacuated from a plastic bag are not easily drawn into the top-side vacuum inlet 810, but rather fall to the bottom of the vacuum recess 806.
In this embodiment, the inner door 802 does not contain a nozzle. The inner door 802 instead contains an air vent 812 that allows air to pass through the inner door 802. When the air vent 812 is open, it prevents the vacuum source 15 within the base housing 2 from creating a vacuum within the vacuum recess 806. To close the air vent 812, and thereby allow the vacuum source 15 within the base housing 2 to efficiently draw air from the vacuum recess 806, the outer door 814 must be closed. By closing the outer door 814, a rubber pad 815 seals the air vent 812 by embracing the air vent 812 and covering it. Sealing the air vent 812 seals the vacuum recess 806 from ambient air and allows the vacuum source 15 within the base 2 to efficiently draw air from the vacuum recess 806.
As shown in FIG. 9, during operation of this embodiment, the open end 817 of a plastic bag 813 that is sealed on three sides is placed within the vacuum recess 806. The inner door 802 is closed, engaging the outer panels of the bag between the inner door 802 and the drip pan 804 as shown in FIG. 10. At this point, the plastic bag 813 is not isolated from the ambient air due to the air vent 812.
Once the plastic bag 813 is secured in the vacuum recess 806, the outer door 814 is closed, as shown in FIG. 11, sealing the air vent 812 and isolating the plastic bag 813 from ambient air. A user may momentarily depress and release a vacuum switch 50 to activate the vacuum source 15 within the base housing 2. Once activated, the vacuum draws air from the interior of the plastic bag 813 and into the vacuum recess 806. As the vacuum source draws air from the interior of the plastic bag 813, excess liquids and food particles are collected in the bottom of the vacuum recess 806 after which the vacuum continues to draw air into the upper-side vacuum inlet 810.
Once sufficient air is evacuated from the plastic bag 813, the pressure sensor 501 detects a significant decrease in the amount of air flow from the plastic bag 813. The heating wire 816 is then activated. When the heating wire 816 is activated, the vacuum source 15 continues to draw air from the interior of the plastic bag 813 while the heating wire 816 fuses layers of the plastic bag 813 together, causing them to form an airtight seal. The heating wire 816 continues to fuse layers of the plastic bag 813 until a predetermined amount of time passes and the timing circuit deactivates the heating wire 816. Once sealed, the outer door 814 and inner door 802 are lifted. The sealed plastic bag 813 is removed and the removable drip pan 804 can be removed for cleaning.
An alternative preferred embodiment of the present invention is shown in FIGS. 18-30. With reference to FIGS. 18-20, the vacuum sealing appliance 1040 includes a base housing 1042 which contains vacuum source 15 and control system 17 for implementing a motor 302 driving a vacuum pump 301 and a pressure sensor 501. The operation of the vacuum source 15, pressure sensor 501, status display 13, control system 17, sealing switch 48 and vacuum switch 50 may be substantially the same as the previously described embodiment shown in FIGS. 1-11. However, in the preferred alternative embodiment, pressure sensor 501 may be a vacuum sensor 1043 that activates and signals the controller 1037 when a predetermined vacuum level is reached. Other alternative embodiments directed to the control of the vacuum and sealing functions of the vacuum sealing appliance 1040 will be described below.
Vacuum sealing appliance 1040 eliminates the use of the inner door 6 shown in FIG. 1, and in place of an open drip pan 4 as previously described with respect to FIGS. 1-11, liquids or solids 1061 evacuated from a flexible container 700 may be held in a drip retainer 1044. The drip retainer 1044 assists in preventing the vacuum source 15 from becoming contaminated by the container contents when extracting air from a flexible container, which may be in the form of a plastic bag 700. The drip retainer 1044 is connected to a nozzle 1046 which is insertable into the opening of the plastic bag 700.
The vacuum sealing appliance further includes a cover 1048 pivotally secured to the base housing 1042. The cover 1048 is rotatable between an open position, FIG. 18, where it is away from an upper surface 1050 of the base housing to a closed position, FIG. 20, where it is in an opposed, adjacent orientation to the upper surface 1050 of the base housing. The cooperation between the cover 1048 and base housing 1042 clamps a flexible bag 700 therebetween in order to permit the bag to be evacuated and sealed.
Referring to FIG. 18, as in the embodiment set forth above and shown in FIGS. 1-11, the cover 1048 may be latched in a closed position and unlatched upon activation of release buttons 1051 which release the latches 1053 from the base housing 1042.
With reference to FIGS. 18-20 and 24, in order to create an airtight seal between the bag 700 and the circumference of the nozzle 1046, the present embodiment includes a first elastomeric material 1052 running along the length of the lower surface 1054 of the cover. The upper surface 1050 of the base housing includes a second elastomeric material 1056 extending along its length and surrounding the removable drip retainer. The second elastomeric material 1056 is positioned beneath the projecting nozzle 1046 in a space existing 1057 between the bottom of the nozzle 1046 and the second elastomeric material 1056 in order to permit the edge 1059 of one side of the bag to be inserted therebetween. The first and second elastomeric material, 1052 and 1056, above and below the bag 700 act as seal members and form a generally airtight seal when the cover 1048 is in the closed position. The seal extends around the drip retainer 1044. This isolates the interior of the bag from ambient air so that the vacuum pump 301 within the base housing 1042 can remove air from the bag 700. The nozzle 1046 extends between the first and second elastomeric material so that is in fluid communication with the inside of the bag 700 even when the cover is in the closed and latched position. In order to facilitate removal of air from the bag 700, the bag may include a series of channels that form evacuation paths. Such a bag is set forth in U.S. Pat. No. 6,799,680 which is incorporated by reference herein. It is also within the contemplation of the present invention that other types of bags and containers may also be used.
In order to seal the bag 700, the base housing 1042 may include a heating element 1058 mounted forwardly of the nozzle 1046 and extending along a portion of the length, L, of the base housing. The cover 1048 may include a flexible strip 1060 running along a portion of its length. The flexible strip 1060 is longitudinally aligned with the heating element 1058 when the cover 1048 is in the closed position as shown in FIG. 26. The heating element 1058 is mounted such that when the cover 1048 is closed, the heating element engages the plastic bag 700 being evacuated. The heating element 1058 is then energized causing the two sides 700a and 700b of the bag to melt and fuse together. The heating element may be in the form of a wire or strip. The heating element 1058 and flexible strip 1060 are both mounted forwardly to prevent the nozzle 1046 from interfering with the seal of the bag 700. In an alternative embodiment, the positioning of the heating element 1058 and flexible strip 1060 may be reversed, with the heating element being disposed on the cover 1048 with the flexible strip 1060 being disposed on the base housing 1042.
During the evacuation of the bag 700, it is possible for fluid or small particles to be drawn out of the bag. Such material if permitted to travel into the vacuum lines 1062 and vacuum source 15 could compromise the operation of the vacuum source. Once these components become contaminated significant effort would have to be expended to clean the system. The drip retainer 1044 of the present invention traps and retains this material before the system becomes contaminated. Drip retainer 1044 is preferably disposed in a recess 1064 formed in the base housing 1042 as shown in FIG. 22. Recess 1064 may be formed in the upper surface 1050 of the base housing and extending in the longitudinal direction, L, along a portion of the length of the base housing 1042. The recess 1064 includes a lower wall 1066 having a vacuum intake port 1068 disposed therein, which is in fluid communication with the vacuum source 15 via vacuum line 1062 shown in FIG. 20. The recess 1064 may be configured to closely receive the drip retainer 1044.
With reference to FIGS. 21-23, the drip retainer 1044 is preferably a substantially closed housing having a bottom wall 1070 perimetrically bounded by an upwardly extending sidewall 1072. The sidewall 1072 ends in a rim 1074 upon which sits a top wall 1076. The bottom, side and top walls all define an interior chamber 1078 that may hold fluid or particles extracted from the bag 700 during evacuation. Unlike the drip pan 4 of the previously described embodiment, the drip retainer 1044 is a substantially enclosed housing. Therefore, the drip retainer 1044 with the attached nozzle 1046 may be easily removed as a one piece cartridge from the recess 1064 without the contents being inadvertently spilled. The drip retainer 1044 may be formed of a transparent or translucent plastic material so that an operator may see its contents and determine whether is needs to be emptied.
The nozzle 1046 may have a generally flat profile with the width being greater than the height. An upper portion of the nozzle 1046a may have a slightly curved shape, and a lower nozzle surface 1046b may be straight. It is within the contemplation of the present invention that the nozzle could have a variety of other shapes such as round or square. The nozzle 1046 is preferably formed of a rigid material such as plastic, but other materials, even those that are flexible, could be used. The nozzle 1046 preferably projects outwardly from the drip retainer top wall 1076 in a direction generally perpendicular to the sidewall 1072. The projecting nozzle 1046 may be inserted into the opening 700c of a plastic bag such that it is in fluid communication with the interior of the bag.
The nozzle 1046 provides a passage 1080 into the chamber 1078 and is insertable into the open end 700c of the plastic bag, therefore, air can be drawn out of the bag via the nozzle. The nozzle 1046 is preferably fixed to the drip retainer 1044 such that the nozzle does not move relative to the drip retainer 1044 or to the base housing 1042 when the drip retainer is disposed within the recess 1064. The nozzle 1046 may be integrally formed with the retainer and preferably with the top and side walls 1072 and 1076 walls thereof as shown in FIG. 22. By locating the nozzle 1046 directly on the drip retainer 1044, all the components of the vacuum sealing appliance that come in contact with the contents of the bag 700 to be sealed may be removed from the base housing by simply removing the drip retainer from the recess. The drip retainer 1044 may then be easily cleaned.
In order to assist in guiding the open end of the bag onto the nozzle 1046, the drip retainer top wall 1076 may include a flat projecting extension 1082. The extension 1082 abuts the side edges 1084 of the nozzle. The portion of the extension adjacent the nozzle 1046 protrudes substantially the same amount from the drip retainer sidewall 1072 as the nozzle. The extension is preferably a relatively flat structure that guides and aligns the open end 700c of the bag on to the nozzle such that the bag 700 is in proper position for evacuation and sealing. The extension may extend along the length of the drip retainer 1044.
In order to permit air to be drawn in through the nozzle 1046, the drip retainer 1044 includes a vacuum opening 1086 for receiving a vacuum intake port 1068 extending upwardly from the recess lower wall 1066. The vacuum intake port 1068 is in fluid communication with the vacuum source 15. The cooperation between the vacuum intake port 1068 and the drip retainer vacuum opening 1086 permits air to be evacuated from the chamber 1078, which in turn permits air in the bag 700 to be evacuated through the nozzle 1046. The vacuum opening 1086 may in the form of an indentation in the bottom wall 1070 and extending up the sidewall 1072 and stopping short of the top wall 1076.
In order to assist in preventing liquids from being draw into the vacuum intake port 1068 and vacuum lines 1062 or pump 301, the vacuum intake port 1068 extends above the recess lower wall 1066. The intake port 1068 may fit within the vacuum opening 1086 in the drip retainer 1044. The vacuum intake port may be integrally formed with the recess 1064. Liquids or any solids withdrawn from the bag 700 through the nozzle 1046, will fall to the bottom of the drip retainer chamber 1078 and remain therein as shown in FIG. 26. As more material is withdrawn from the bag, the level of material in the retainer will rise. A user may remove the drip retainer and empty it so that the liquid level does not rise above the top 1090 of the vacuum intake port. In order to maximize the amount of material that can be held within the drip retainer, the top of the vacuum intake port 1090 may extend upwardly just below the drip retainer top wall 1076. In addition, in order to minimize the possibility of aspiration of fluid into the vacuum intake port 1068, the nozzle 1046 may be positioned longitudinally offset from the vacuum intake port 1068. In this way, liquid or particles falling from the nozzle 1046 will fall into the bottom of the drip retainer chamber 1078 and not into the vacuum intake port 1068.
In a preferred embodiment, the drip retainer 1044 is removably securable within the base housing recess 1064 by a locking device 1092 shown in FIG. 25. Locking device 1092 includes a resilient lever 1094 projecting upwardly from recess lower wall 1066. Lever 1094 may project through a channel 1096 that extends through the drip retainer from the bottom wall 1070 to the top wall 1076. The channel 1096 is bounded by an annular wall 1098 which seals the drip retainer and permits the channel to extend therethrough and the chamber 1078 to retain liquid. A distal end of the lever includes a projection 1100 extending substantially perpendicular therefrom. Projection forms a catch 1100 that engages the drip retainer top wall 1076 when the drip retainer 1044 is inserted into the recess. Cover lower surface 1054 may include a depression 1101 in order to accommodate a lever top portion 1099 that projects above the drip retainer.
With reference to FIGS. 22 and 27-28, a biasing device 1102 may also be provided which tends to urge the drip retainer 1044 upward, thereby urging the top of the drip retainer against the catch 1100. Biasing device 1102 preferably includes a pair of spring loaded plungers 1104 each extending through an aperture 1106 in the recess lower wall 1066 and translatably retained therein. The aperture may be in communication with ambient air. It is within the contemplation of the present invention that one or more than two plungers could be used. Plungers 1104 preferably include a stem 1108 having a head 1110 at one end and a flange 1112 at the other end. The drip retainer bottom wall may include indentations 1113 in which the top of the heads may sit. Plungers 1104 are each biased upwardly by a spring 1114 disposed below recess lower wall 1066. Springs 1114 engage the bottom of a spring housing 1115 and the underside of the heads 1110. The flange 1112 has a diameter greater than an opening 1117 in the bottom of the spring housing 1115 through which the flange extends. Therefore, the upward travel of the plungers are limited. In addition, the head 1110 disposed on an upper portion of the stem 1108 has a diameter greater than the aperture 1106 in the recess lower wall. Accordingly, the plungers are each retained within the recess and moveable between an up and down position. Located on each stem 1108 and abutting the underside of the head 1110 is a seal 1116. When the drip retainer 1044 is fully inserted in the recess 1064, the plungers 1104 are fully depressed as shown in FIGS. 26 and 28. In this position, the seals 1116 create an airtight seal over the apertures 1106 through which the plungers extend and seal the bottom of the recess of the from ambient air.
In order to insert the drip retainer 1044 into the recess 1064, the channel 1096 is aligned with the lever 1094, and the drip retainer may then be lowered into the recess. When drip retainer bottom wall 1070 engages the plungers 1104, they are urged downwardly. Continued downward movement of the drip retainer causes the plunger heads 1110 to compress the seals 1116 and seal the recess apertures 1106. The relevant components are dimensioned such that the plungers bottom out and seal the apertures when the lever catch 1100 engages the drip retainer top wall 1076, thereby locking the drip retainer within the recess. As shown in FIG. 25, the biasing force of the springs 1114 urge the top of the drip retainer against the catch 1100 when in the locked position. Also when the drip retainer is in the locked position, the vacuum intake port 1068 is inserted within the vacuum opening 1086 such that the nozzle 1046 is in fluid communication with the vacuum source 15. In order to unlock the drip retainer, a user may deflect the lever 1094 such that the catch 1100 clears the top of the drip retainer, the biasing device 1102 will then move the drip retainer 1044 upwardly (FIGS. 24 and 27), permitting it to be removed from the recess by the user.
In addition to securing and releasing the drip retainer 1044, the locking device 1092, in cooperation with the nozzle 1046 and first elastomeric material 1052, forms a bag holding device 1118, FIG. 24, that retains the bag 700 in position to be evacuated and sealed. After the opening of a bag to be sealed is placed around the nozzle, a user may then push the drip retainer 1044 downward to the locked position. In the locked position as shown in FIG. 25, the nozzle 1046 and the extension 1082 preferably compresses the second elastomeric material 1056 located below it. Therefore, the portion of the bag below the nozzle 1046 and extension 1082 is captured between the nozzle 1046 and a portion of the first elastomeric material 1052. The bag 700 is held in place allowing the user to have both hands available to close the cover 1048 and complete the evacuating and sealing process. After the bag is sealed, the cover 1048 may be unlatched and opened. The evacuated and sealed bag may be released by deflecting the lever 1094 to unlatch the drip retainer 1044 and permit it to move upward by the force of the biasing device 1102. When the drip retainer 1044 moves upward, the bag 700 is released.
In an alternative embodiment, the movement of the drip retainer and the locking thereof may be driven by the movement of the cover between the open and closed position.
The drip retainer 1044 is preferably sealed with the exception of the openings formed by the nozzle 1046 and vacuum opening 1086. Since the drip retainer 1044 is substantially enclosed, this allows the drip retainer 1044 to be removed from the base housing 1042 without spilling any of the retained liquid. By avoiding such spilling, contamination and unnecessary cleaning of the vacuum sealing appliance 1040 can be avoided. In order to remove material including liquid and particles contained in the chamber 1078, one of the drip retainer walls may include an access opening that forms a flush out port 1120. This port 1120 is preferably in the bottom wall 1070, but may be located on any of the drip retainer walls. Flush out port 1120 may be selectively sealed by a removable resilient plug 1122. When the plug 1122 is removed, retained liquid may be poured out and fresh water or other cleaning liquid can enter the chamber to permit the drip retainer to be thoroughly cleaned.
In an alternative embodiment, in order to remove the retained liquid and other material, the top wall of the drip retainer may be in the form of a removable lid. The top wall may be held to the sidewall by a friction fit or other snap fit connection. It is within the contemplation of the present invention that any means of attachment may be employed to secure the top wall to the sidewall in order to permit it to be removably secured thereto. By removing the lid, access to the inside chamber is readily available, thereby allowing the retained material to be emptied out and the entire retainer to be thoroughly cleaned.
A further alternative embodiment of the fluid retainer (not shown) may be one which is sealed and any liquid retained therein may be poured out through the nozzle. In this embodiment, the drip retainer could be flushed out by forcing water through the nozzle or upper vacuum port.
In order to assist in cleaning the drip retainer 1044, it may be made out of a dishwasher safe material such as that set forth above with respect to the drip pan 4. In addition, as with the drip pan 4, the drip retainer may be made out of a plastic material which is treated with a biocide such as Microban® marketed by Microban International, Ltd. in order to retard bacterial or other microbial growth.
As in the embodiments described with respect to FIGS. 1-11, in the present embodiment, base housing may include a space 1124 for holding a roll of material 1126 forming the plastic bags 700. As shown in FIGS. 18-20, the holding space 1124 may retain a bag roll 1126 held on a removable rod 1128. A cutting tool 1130 is disposed adjacent the roll such that length of bag material 1125 can be parted from the roll of material 1126. Cutting tool 1130 may include a cutting blade 1131 running in a longitudinally extending track 1132 running parallel to the roll of the bag material 1126. However, unlike the previous embodiment shown in FIG. 1, in the present embodiment, the holding space may be located on the back side of the base housing 1042 opposite the side including the heating element 1058. The holding space 1124 may be covered by a lid 1133 pivotally secured to the base housing 1042. The lid 1133 moves between an open and closed position to permit installation and removal of the roll of bag material.
Referring to FIG. 19, in order to activate the vacuum and sealing functions, the sealing switch 48 and vacuum actuation switch 50′ are provided on the base housing 1042. The present embodiment further includes a vacuum level selector 1134. This selector 1134 is preferably a two position switch that allows a user to choose a desired level of vacuum in the container. In a first vacuum level selector position, a high vacuum level is selected, and when the vacuum actuation switch 50′ is actuated by a user, the controller 1137, which may be part of control system 17, awaits the signal from the vacuum sensor 1143 until the next step in the process commences. In a second vacuum level switch position, when the vacuum actuation switch 50′ is actuated, the vacuum pump 301 is activated for a predetermined period of time before the controller 1137 activates the heating element to commence the sealing function. The selection of the low vacuum level may be desirable when one does not want to overly compress the contents of the bag, such as when used with breads or muffins. It is also within the contemplation of the present invention that more than two vacuum levels could be selectively chosen by a user. These levels could be a set number of discrete options selectable by a switch or there could a variable selector which allows a user to select any desired vacuum level within a range.
It is further within the contemplation of the present invention that the two vacuum levels could be achieved by using a high vacuum sensor and a low vacuum sensor, with the control being responsive to one of these sensors depending on the selection made by the user. Alternatively, a vacuum transducer could be used which outputs a variable signal to the controller corresponding to a vacuum level.
In operation, a length of bag material 1125 may be pulled from the roll 1126 and parted by sliding the cutting tool 1130 in the track 1132. One end of the bag material may be aligned over the heating element 1058 and the cover 1048 rotated to the closed position. The user would then depress the seal button and the heating element 1058 would be energized for a predetermined time in order to seal the bag at one end. The bag 700 may then be filled with material.
In order to excavate the filled bag and seal it closed, the bag opening 700c may be longitudinally aligned with length of the vacuum sealing appliance 1040. The drip retainer 1044 may be inserted in the recess 1064 in an unlocked position such that there is a space 1057 between the bottom of the nozzle 1046 and the surrounding portion of the second elastomeric material 1056. The bag opening 700c may then be slipped around the nozzle 1046, FIG. 24. The user may then press the drip retainer 1044 downwardly until its top wall 1076 passes below the catch 1100 on the lever. The lever 1094, which is partially deflected while riding within channel 1096, will then return to an undeflected position, thereby securing the drip retainer 1044 in the locked position FIG. 25. The downward movement of the drip retainer will also move the plungers 1104 to their downward position sealing off the recess apertures 1106 through which they travel. With the nozzle 1046 projecting into the flexible bag opening, the cover 1048 may be rotated into the closed position and held in the closed position by the latches 1053, FIG. 26. When the cover is in this locked closed position, the first and second elastomeric material 1052 and 1056 on the cover and base housing, respectively, and plunger seals 1116 create an air tight seal around the nozzle 1046 and the entire recess 1064.
The user may then select high or low vacuum level by actuating selector 1134 and then press the vacuum switch 50 in order to activate the vacuum pump 301. The air from the bag 700 is drawn through the nozzle 1046. Any liquid or any small solids drawn into the nozzle from the bag will fall to the bottom of the drip retainer 1044 and be held there. This retained material 1061 will not obstruct air drawn through the nozzle and vacuum intake port 1068. If the high vacuum level is selected, when the predetermined vacuum level is reached, vacuum sensor 1043 will change state thereby signaling the controller 1137 to begin the sealing process. If the low pressure level is selected, after the vacuum pump runs for a predetermined amount of time, the sealing process will begin. Alternatively, an additional sensor could be provided to sense the low vacuum level and change state when the low level is reached.
Next, the heating element 1058 disposed along the longitudinal front edge of the base housing 1042 is energized to heat and seal the bag opening 700c. When the heating element is energized, the status display 13 may illuminate. Running along the length of the cover 1048 opposed from the heating element 1058, the flexible strip 1060 urges the two bag sides 700a and 700b together in order to permit them to be heat-sealed together. When the predetermined sealing time is completed, both the vacuum pump and heating element are deactivated. The status display may continue to be illuminated for several seconds more in order to give the sealed area time to cool. After this time expires the status display 13 may shut off indicating to the user that the vacuum and sealing process is completed. The cover 1048 may be unlatched by depressing the latch release buttons 1051 and opened.
In order to remove the evacuated and sealed bag 700, the drip retainer 1044 is unlocked by deflecting the lever 1094 such that the catch 1100 clears the drip retainer top wall 1076. The biasing device 1102 will then moved the drip retainer 1044 with its nozzle upward, thereby releasing the bag. The user may then remove the drip retainer 1044 and proceed to empty any retained material 1061 and clean the drip retainer.
The present embodiment also permits other types of containers to be evacuated through use of an adapter assembly 11 as shown in FIGS. 1 and 12A-18. The adaptor assembly 11 includes an adaptor 901 and an adapter tube 906. With reference to FIGS. 19 and 29-30, in the preferred alternative embodiment, the adapter tube is insertable in an auxiliary vacuum intake port 1136 located on a top side of the base housing 1042. The auxiliary port 1136 is fluidly connected by vacuum line 1062 to the vacuum source 15. As shown in FIG. 29, the auxiliary port 1136 includes a check valve 1138 including a spring 1140 and valve member 1142. A user may insert into the port an adapter tube 906 shown in FIG. 19. The adapter tube 906 may be attach to the adaptor 901 shown in FIGS. 1 and 12A-17 and used to evacuate various canisters. The insertion of the adapter tube 906 into the auxiliary port 1136 unseats the valve member 1142 and allows air to flow through the auxiliary port 1136. In order to ensure that adaptor tube 906 is not blocked when it engages valve member 1142, valve member 1142 may include a projection 1143. When the end of the adaptor tube 906 is inserted in the auxiliary port 1136, it will engage the projection. Air can then freely flow through the adaptor tube 906 and past the valve member 1142. The projection 1143 is preferable in the form a cross as shown in FIG. 30, however, other configuration could be used that keep the end of the tube off the round surface of the valve member and permit air to flow from the adaptor tube 906. When the adaptor tube 906 is removed from the auxiliary port 1136, the check valve 1138 shuts off the auxiliary port 1136 preventing air flow therethrough. By using the auxiliary vacuum port 1136, storage containers other than the flexible plastic bags may be vacuum sealed as described below.
The adaptor assembly 11 may also be used in conjunction with the base housing 2 as shown in FIG. 1 to evacuate separately provided storage containers. An adaptor 901, shown in FIGS. 12 and 13, generally includes an adaptor casing 902, a rubber gasket 904, an adaptor tube 906, and a vacuum post 908. The adaptor 901 is in communication with the vacuum source 15 of the base housing 2 to create a vacuum within an interior space 916 defined within the adaptor 901. The adaptor 901 can be placed over the open end of a jar-like container to be evacuated, such as a mason jar. The adaptor 901 uses the vacuum source 15 to draw air from the attached container.
Preferably, the adaptor casing 902 is generally dome-shaped or semispherical, thereby defining the cup-like interior 916 to the adaptor casing 902. A lower area 910 of the adaptor casing 902 is surrounded on its perimeter by the circular rubber gasket 904 having an upper portion 912 and a lower portion 914. The upper portion 912 of the rubber gasket is attached to the interior 916 of the adaptor casing 902 to allow the lower portion 914 of the rubber gasket 904 to form a flange. The flange portion of the rubber gasket 904 cooperates with the portion 912 of the gasket and the lip 902A of the casing to form an annular gasket recess 904A. The flange is movable inwardly toward the center of the adaptor casing 902 and away from the lip 902A of the casing. This inward movement allows the gasket recess 904A and the rubber gasket 904 to embrace and seal a container mouth on which the adaptor casing 902 is placed as shown in FIG. 14, forming a virtually airtight, substantially hermetic seal between the interior 916 of the adaptor casing 902 and a mouth or opening of the container.
The vacuum post 908 extends from a center point in the interior 916 of the adaptor casing 902 toward the lower area 914 of the adaptor casing 902. The post 908 is of sufficient length to allow the adaptor casing 902 to rest on the top of a container. The vacuum post 908 defines an air passageway 922 running from an end 924 of the vacuum post 908 in the interior 916 of the adaptor casing 902 to an air valve 920 on the exterior of the adaptor casing 902. The end 924 of the vacuum post 908 additionally defines slits 923 allowing air to be drawn into the sides of the vacuum post 908 if the end 924 is obstructed.
The adaptor tube 906 includes two ends, one attached to the vacuum source 15 at the upper-side vacuum port 610 on the drip pan 4 and one attached to the exterior of the adaptor casing 902 at the air valve 920. The end of the adaptor tube 906 which connects to the upper-side vacuum port 610 includes an adaptor that allows the adaptor tube 906 to insert inside the vacuum channel 606 defined by the upper-side vacuum port 610. The end of the adaptor tube 906 which connects to the adaptor casing 902 at the air valve 920 is connected to an L-shaped adaptor that fits over and embraces the exterior of the air valve 920.
During operation, the adaptor tube 906 is attached to the vacuum source 15 and the adaptor 901 is placed over a canister or a mason jar 928 with a disk-like lid 930. The mason jar or canister 928 is preferably inserted until the vacuum post 908 rests against the lid 930 and the rubber gasket 904 of the adaptor 901 surrounds or contacts the sides of the mason jar or canister 928. To activate the vacuum source 15, a user may momentarily depress and release a vacuum switch 50 on the base housing 2. Once activated, the vacuum source 15 draws air from the end 924 of the vacuum post 908 by drawing air through the adaptor tube 906 and the air passage way 922.
In the case of a mason jar 928, drawing air from the end 924 of the vacuum post 908 creates a vacuum within the interior 916 of the adaptor casing 902, which forces the lower portion 914 of the rubber gasket 904 to move inward and embrace the sides of the mason jar 928 to form a seal. Drawing air from the interior 916 of the adaptor also causes portions of the outer edges 931 of the disk-like lid 930 to bend upwardly around the centrally located vacuum post 908 due to the air pressure in the mason jar 928 while the center of the lid 930 stays in place due to the vacuum post 908. The bending of the outer edges 931 allows the vacuum source to draw air from the interior of the mason jar 928 to equalize pressure with the interior 916.
Once the air pressure above and below the lid 930 equalize, the outer edges 931 of the lid 930 flex back to their normal position and the lid 930 rests flat against the top of the mason jar 928. At this time, the pressure sensor 501 detects a significant decrease in the amount of air leaving the vacuum source 15 and a signal is sent to the micro-chip controller 506. The micro-chip controller 506 deactivates the vacuum source 15 and the adaptor casing 902 may be removed from the vacuum source 15, allowing air to return into the interior 916 of the adaptor casing 902. Ambient air pressure pushes the lid 930 securely on the mason jar 928 and effectively seals the mason jar 928 from ambient air. The adaptor casing 902 is removed and a metal retaining ring 932 can be placed around the lid 930 of the jar to secure the disk-like lid 930.
The adaptor 901 is additionally compatible with a canister 1038 implementing a canister lid valve assembly 1001. As shown in FIG. 15, the canister 1038 is shaped with a complementary lid 1012 including the canister lid valve assembly 1001. The canister lid valve assembly 1001 allows a user to easily seal an interior of the canister 1038 from ambient air after a vacuum source extracts sufficient air from the interior of the canister 1038. The canister lid valve assembly 1001 additionally allows a user to easily allow ambient air back into the interior of the canister 1038 by simply turning a knob on the canister.
The canister lid valve assembly 1001 generally includes a knob 1002, a plate spring 1004, a piston pipe 1006, a piston ring 1008, and a rubber piston 1010. These components are positioned within an opening defined in the canister lid 1012.
The piston ring 1008 mounted on one end of the rubber piston 1010 create a piston assembly 1013, which is mounted to move upwardly and downwardly based on relative air pressure above and below the canister lid valve assembly 1001. When the piston assembly 1013 moves upwardly, the vacuum source 15 can draw air from the interior of the canister 1038. Once sufficient air is drawn from the interior, the piston assembly 1038 moves downwards to seal the interior from ambient air and effectively seal the evacuated interior. To allow ambient air back into the interior of the canister 1038, the knob 1002 may be turned, which in turn rotates the piston assembly 1013 to vent air from the canister 1038.
The rubber piston 1010 is preferably cylindrical with at least one, preferably two passageways 1014 extending longitudinally along the length of the rubber piston 1010 that are large enough to sustain air flow between a lower side of the rubber piston 1016 and an upper side of the rubber piston 1018.
The piston ring 1008 is preferably disk-shaped, having an annular lip 1019 extending downwardly to embrace the rubber piston 1010. As with the rubber piston 1010, the piston ring 1008 defines matching passageways 1020 large enough to sustain air flow between a lower side 1022 of the piston ring 1008 and an upper side 1024 of the piston ring 1008. The piston ring passageways 1020 are spaced to align with the rubber piston passageways 1014. During assembly, the rubber piston 1010 is inserted into the piston ring 1008 with their respective passageways aligned so that air can flow between the top of the piston ring 1024 and the lower side of the rubber piston 1016.
The piston assembly 1013 rests in a central recess 1026 defined in the canister lid 1012. The central recess 1026 further defines matching passageways 1027 to sustain air flow between an upper portion 1028 of the lid 1012 and a lower portion 1030 of the lid 1012 when the passageways are unobstructed. The central recess passageways 1027 are alignable with the rubber piston passageways 1014 so that when the two sets of passageways are aligned, they are in direct communication with a corresponding pair of passageways in the piston assembly 1013.
The piston assembly 1013 is designed to obstruct and seal the central recess passageways 1027 when the central recess passageways 1027 are not rotatably aligned with the rubber piston passageways 1014. The piston assembly 1013 and central recess 1026 are also designed to allow the piston assembly 1013 to move upwardly and downwardly a distance 1031 within the central recess 1026 depending on whether a vacuum is present. The distance 1031 is sufficient enough to sustain an air flow from the interior of the canister through the central recess passageway 1027.
To prevent the piston assembly 1013 from exiting the central recess 1026 when a vacuum force is applied to the piston assembly 1013, the piston pipe 1006 is inserted into the central recess 1026 over the piston assembly 1013. The piston pipe 1006 frictionally embraces the walls of the central recess 1026 so that the piston pipe 1006 is generally fixed. It may also be affixed with an adhesive compound.
The knob 1002 may be positioned over the pipe 1006, and consists of a circular disk 1033 attached to a set of downwardly extending fingers 1032. The fingers 1032 pass through a hollow area in the center of the piston pipe 1006 and rotationally engage the piston ring 1008. Each finger 1032 defines at least one slot 1034 with a size corresponding to a tab 1036 extending upwards from the piston ring 1008. Each finger 1032 captures at least one tab 1036 so that the knob 1002 and piston assembly 1013 are in direct communication.
Due to the communication between the knob 1002 and the piston assembly 1013, when the knob 1002 is rotated the entire piston assembly 1013 rotates. This movement changes whether the rubber piston passageways 1014 are aligned with the central recess passageways 1027, thereby changing whether air can flow between the upper portion 1028 of the lid 1012 and the lower portion 1030 of the lid 1012, or whether the piston assembly 1013 effectively forms a seal over the central recess 1026 due to the rubber piston passageways 1014 being offset from the central recess passageways 1027.
The plate spring 1004, which is a torsion-type spring, rests within the piston pipe 1006 having one end embracing the knob 1002 and another end embracing the piston pipe 1006. The plate spring 1004 places a rotary bias on the knob 1002 in a counterclockwise direction such that for the piston assembly 1013 to rotate in a clockwise direction, the knob 1002 must rotate in a clockwise direction against the bias of the plate spring 1004. The piston assembly 1013, knob 1002, and plate spring 1004 are designed to operate with the piston pipe 1006 such that when the plate spring 1004 is in a normal position as shown in FIG. 16, the knob 1002 is prevented from moving too far in a counterclockwise direction by a stop member (not shown) within the piston pipe 1006. In this normal position, the central recess passageways 1027 and rubber piston passageways 1014 are not aligned. Therefore, the central recess passageways 1027 are sealed so that air cannot pass from the lower side of the lid 1030 to the upper side of the lid 1028.
During operation, the lid 1012 is placed on a canister 1038 filled with appropriate material. A rubber gasket between the lid 1012 and the canister 1038 forms an airtight seal between the canister 1038 and the lid 1012 containing the canister lid valve assembly 1001 so that the only source of ambient air is the top of the lid 1012. A vacuum source is applied to the upper portion of the lid 1028 creating a vacuum within the central recess 1026. In one embodiment, the vacuum source 15 is applied using the adaptor 901 previously described, but other vacuum sources or adaptors may be used.
The force of the vacuum within the central recess 1026 pulls the piston assembly 1013 upwards allowing the vacuum source 15 to draw air from the interior of the canister 1038. More specifically, when a vacuum exists within the central recess 1026, the piston assembly 1013 lifts upwardly due to the air pressure within the canister 1038. Due to the upward position of the piston assembly 1013, the central recess passageways 1027 are no longer obstructed, allowing the vacuum source 15 to be in communication with the interior of the canister 1038.
After sufficient air exits the canister 1038, the air pressure between the upper portion 1028 of the lid 1012 and the lower portion 1030 of the lid 1012 equalizes, causing the piston assembly 1013 to descend to its original position. The vacuum source 15 can then be removed causing ambient air to surround the piston assembly 1013, forcing the piston assembly 1013 securely against the central recess passageways 1027 to seal the central recess passageway 1027 and the interior of the canister 1038 from ambient air.
When the user desires to open the canister 1038 and allow ambient air back into the canister 1038, the knob 1002 is rotated in a clockwise direction causing the piston assembly 1013 to rotate. The knob is only capable of rotating approximately 45° due to tabs or similar means to stop rotation. This rotation aligns the central recess passageways 1027 with the rubber piston passageways 1014 as shown in FIG. 17. The alignment allows ambient air to rush into the interior of the canister 1038. After the interior of the canister 1038 is equalized with the ambient air pressure, the lid 1012 can be easily removed for access to the contents of the canister 1038.
While preferred embodiments of the invention have been described, it should be understood that the invention is not so limited and modifications may be made without departing from the invention. The scope of the invention is defined by the appended claims, and all devices that come within the meaning of the claims, either literally or by equivalence, are intended to be embraced therein.

## Claims

1. An apparatus for evacuating a flexible container, the apparatus comprising:
a base housing having a longitudinal axis for receiving therealong an open end of the flexible container;
a vacuum source disposed within said base housing; and
a generally elongate drip retainer being removeably disposed on said base housing, said drip retainer having a longitudinal axis extending in the direction of said longitudinal axis of said base, said drip retainer defining a chamber, said chamber having a vacuum opening in communication with said vacuum source, said drip retainer including a nozzle having a passage into said chamber, said nozzle being engagable with an opening of the flexible container, said nozzle passage being disposed at a first position on said drip retainer and said vacuum opening being disposed at a second position on said drip retainer, and wherein said first position is spaced from said second position a distance along said longitudinal axis of the drip retainer.

2. The apparatus of claim 1, wherein said drip retainer is disposed within a recess in said base housing.

3. The apparatus of claim 1, wherein said drip retainer includes an opening selectively sealable by a removable plug for permitting contents of said drip retainer to be removed therefrom.

4. The apparatus of claim 1, wherein said drip retainer includes extensions disposed adjacent said nozzle for guiding and aligning the flexible container.

5. The apparatus of claim 1, wherein said drip retainer includes an aperture extending there through for receiving a locking device.

6. The apparatus of claim 1, wherein said base housing includes elastomeric material surrounding said drip retainer.

7. The apparatus of claim 1, wherein said drip retainer includes a bottom wall and said vacuum opening is disposed above said bottom wall.

8. An apparatus for evacuating a flexible container, the apparatus comprising:
a base housing having a longitudinal axis for receiving therealong an open end of the flexible container;
a vacuum source disposed within said base housing;
a drip retainer removeably disposed on said base housing and being in communication with said vacuum source, said drip retainer including a bottom wall perimetrically bounded by a sidewall, a top wall disposed on said sidewall, said bottom, side wall and top wall forming a substantially enclosed chamber adapted to hold liquid, said drip retainer having a longitudinal axis extending in the direction of said longitudinal axis of said base;
a nozzle projecting from said top wall of said drip retainer and forming a passage into said chamber, said nozzle adapted to be inserted into the opening of the flexible container; and
a vacuum opening formed in one of said bottom, side or top walls, said vacuum opening being in fluid communication with said nozzle passage, and wherein said nozzle passage being disposed at a first position on said drip retainer and said vacuum opening being disposed at a second position on said drip retainer, and wherein said first position is spaced from said second position a distance along said longitudinal axis of the drip retainer.