Patent Document

This application is a continuation of prior application Ser. No. 09/304,387, filed May 4, 1999, now U.S. Pat. No. 6,161,725. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates generally to fluent product dispensers, and more particularly to fluent product dispensers having temperature-indicating means for indicating the temperature of the products. 
     There exist many fluent product dispensers in the marketplace. Some dispensers are well known and are used to dispense amounts of expandable one-component urethane foams, such as GREAT STUFF, manufactured and sold by Flexible Products Company of Joliet, Ill., the assignee of the present invention. Other fluent product dispensers are used to first mix, and then dispense two foam components that are reacted with each other within the dispenser. Once mixed together, the two components combine and expand to form an expansive foam. This reacted foam may be used in adhesive applications, in caulking applications, in sealing applications or the like. 
     The use of such two reactive components is often temperature dependent. There is an optimum temperature for operation of the two foam components. Below this optimum temperature (of one or both of the two foam reactive components), the quality of the reacted foam suffers, such as a much lower foam yield occurring from the reaction. In the actual field use of these foam components, the product packaging or literature that accompanies the dispenser may typically indicate that the foam should be dispensed when the temperature of one or more of the foam reactive components is above a certain temperature, such as 75° F. Some instructions recommend that the containers be placed in a warm environment for 48 hours or more so that the contents will rise to 75° or above. Despite these cautionary instructions, conventional two foam component fluent dispensers have no means to determine the temperature of the contents of foam component containers. 
     Many users do not fully acclimate the containers, perhaps out of a mistaken belief that the containers warm more quickly than they actually do. Users also become impatient with the time needed for complete acclimation and operate the dispensers when the components are colder than they should be. Resulting foam yields will be small leading to inefficiency and the foam components may not completely react with each other, affecting the quality of the foam produced. 
     A need therefore exists for means to readily indicate to the user the temperature of the contents of the foam components so as to ensure the proper dispensing of the foam components. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is a general object of the present invention to provide a means for readily indicating the temperature of the foam components from the exterior of the supply containers for the reactive foam components. 
     Another object of the present invention is to provide a fluent product dispensing apparatus having a dispenser, supply containers of reactive foam components, a conduit for conveying the foam components to the dispenser and a means for indicating the temperature of the foam components that is fixed to at least one of the supply containers, which can be easily and readily read by a user. 
     A further object of the present invention is to provide a foam dispensing assembly having a manually operated foam dispenser, a pair of foam component supply containers, each container having a predetermined amount of foam component therein, a pair of supply tubes for connecting the supply containers and the dispenser together, a temperature indicator operatively associated with at least one of the supply containers having a display indicating a range of temperatures of the foam components held in the supply containers, the display being easily readable by a user so as to determine when the foam components may be properly dispensed in accordance with the foam application instructions. 
     In one principal aspect of the present invention, the entire dispensing apparatus is contained in a carton as a unit. The carton contains two foam component supply canisters and an actuating assembly in the form of two foam component supply tubes, each having a preselected length which is sufficient to permit a dispensing assembly attached to the supply tubes to be operated remotely from the carton while interconnected thereto. The material supply tubes, dispensing assembly and one or more detachable dispensing nozzles are positioned within a predesignated area within the carton so that the apparatus may be sold as a single unit. The carton not only may function as a carrier assembly for the dispensing apparatus, but also may function as a shipping container therefor. 
     In another principal aspect of the present invention, the dispensing apparatus includes a carrier which holds two foam component supply canisters in place and incorporates an actuating/handle assembly to ensure simultaneous release of the two foam components from their respective supply canisters through foam component supply tubes. The tubes extend to a foam dispenser which includes a dispensing nozzle. The dispenser detachably engages the carrier so that it may be detached and remotely operated away from the supply canisters adjacent a workplace such that it is easily operated with one or two hands. The carrier is capable of holding the supply canisters in place in either an upright or inverted orientation. 
     Still a further object of the present invention is to provide such a foam dispensing assembly wherein the temperature indicator is mounted to the supply container and the supply containers being enclosed within a carton, the carton having an opening in registration with the temperature indicator so that the temperature indicator may be read from exterior of the carton, the temperature indicator being affixed to the supply container and including a liquid crystal display. 
     Yet another object of the present invention is to provide a foam component supply container having a predetermined amount of foam component contained therein with an associated temperature indicator, the temperature indicator being mounted on the exterior of the supply container and having a heat-activated portion that indicates the general temperature of the contents of the supply container. 
     Yet still another object of the present invention is to provide a temperature indicator for use with a pressurized reactive foam component supply container that is affixed to the exterior of the supply container in a location to indicate the temperature of the reactive foam component other than the pressurizing medium, the temperature indicator having at least a line of temperature demarcation that indicates both acceptable and unacceptable application temperatures for the reactive foam component. 
     The present invention accomplishes these objects by providing, in one principal aspect of the invention, a thermosensitive temperature indicator, preferably in the form of a flat, layered indicator that incorporates a layer of a liquid crystal display substance that changes color in response to temperature changes. The liquid crystal display indicator has, in one embodiment thereof, a pressure-sensitive backing so that it may be applied directly to one of the two supply containers. 
     In another principal aspect of the present invention, the temperature indicator, in one embodiment thereof, includes visual indicia formed thereon in the form of a range of temperatures arranged in ascending order so as to facilitate the reading thereof by the user of the apparatus. In another embodiment, the temperature indicator may include a line of demarcation that divides the temperature range into two portions, one portion having a temperature responsiveness to temperature below the recommended minimum application temperature of the foam components and the other portion having a temperature responsiveness to temperatures equal to or above the recommended minimum application temperature of the foam components. 
     In another principal aspect of the present invention, the foam dispensing apparatus includes two foam component supply containers, an actuating assembly, two foam component supply tubes of a preselected length which is sufficient to permit a dispensing assembly attached to the supply tubes to be operated remotely from the supply containers and a manually operable foam dispenser. One or both of the foam components supply containers may include a temperature indicator as described above affixed to its exterior surface. The foam component supply containers and the actuating assembly are contained within a carrier assembly that permits the supply containers to be held by a user with one hand, while the user may hold and actuate the foam dispenser with the other hand. 
     In yet another principal aspect of the present invention and as exemplified by one embodiment thereof, the carrier assembly includes a carton that substantially encloses the two supply containers and actuating assembly. The carton may have a window formed in one of its sidewalls in registration with the temperature indicator so that the temperature indicator may be read from the outside without the need for opening the carton and removing the supply containers. The window may be slightly larger than the temperature indicator or it may be a larger size window to permit viewing of the other components of the apparatus. 
     The carrier assembly in an alternate embodiment, includes a carrier member that holds two foam component supply containers and incorporates a handle into an actuating assembly formed as part of the carrier assembly. No window is required in this embodiment because it has no carton that serves as both a package and a carrier. The temperature indicator is fixed to one or both of the supply containers and is easily read by the user. 
     These and other objects, features and advantages of the present invention will be clearly understood through consideration of the following detailing descriptions. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a known fluent product dispensing apparatus; 
     FIG. 2A is an elevational view of one style of a temperature indicator for use with a fluent product dispenser in accordance with the principles of the present invention; 
     FIG. 2B is a similar view of another style of temperature indicator for use with a fluent product dispenser in accordance with the principles of the present invention; 
     FIG. 2C is a similar view of another style of temperature indicator for use with a fluent product dispenser in accordance with the principles of the present invention; 
     FIG. 3 is a perspective view of a fluent product dispensing assembly in the form of a kit and constructed in accordance with the principles of the present invention; 
     FIG. 4 is an exploded view of the assembly of FIG. 3, illustrating the components associated therewith; 
     FIG. 5 is a perspective view of an alternative fluent product assembly utilizing a temperature-indicating means according to the invention; and, 
     FIG. 6 is a perspective view of another alternative fluent product assembly according to the invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIG. 1, a known fluent product dispensing apparatus is illustrated generally at  10 . The apparatus  10  is particularly suitable for the two-handed dispensing of a fluent product, such as an expandable foam that is formed by the reaction between two different reactive components. 
     The fluent products dispensed by the apparatus  10  are typically urethane and other expandable foams. Urethane foams in particular, are known for their compatibility with low-cost blowing agents that permit such foams to be applied by way of pressurized containers. The natural adhesive qualities of these foams also allow them to bond excellently to any number of substrates. Typically, such urethane foams are the reaction product of two different and individual components, one typically being a foaming agent and the other typically being a resin. 
     When reacted together, these components give the resultant foam various chemical compositions, with each such composition having significant utility in a particular application. These foams, and particularly urethane foams may be specially formulated to provide a final foam which is rigid, flexible, semi-rigid or the like. The foams produced may also be either open cell or closed cell in structure, with the former having particular utility in packaging and non-insulating applications and with the latter having particular utility in building and structural insulation applications. The reactive components for urethane foams typically include a foaming agent and a resin, each such component being separately contained within a respective foam component supply container  12 ,  14 . 
     A dispenser is provided to dispense the foam and it is connected to the foam component supply containers by way of tubes or other conduits, such as the hoses  16  illustrated. The hoses  16  serve to convey each from component to dispenser  18  where they are mixed together, preferably in a disposable nozzle body portion  20  of the dispenser  18 , prior to exiting the dispenser  18  under pressure through a nozzle opening  22 . 
     The supply containers  12 ,  14  and the other components may be enclosed within a carton  24  that may have a handle  26  or the like formed thereon that facilitates the handling of the overall apparatus  10 . The hoses  16  exit the carton  24  through an opening (not shown) and connect to the dispenser  18 . As mentioned above, problems arise with the use of such dispensing apparatus in that the foam components have a range of optimum temperatures for application. Although the carton  24  or the containers  12 ,  14  themselves may contain directions as to the proper application temperature for the components, many users have no idea when the components are at their proper application temperature. Users may grow impatient with a need to acclimatize the components. 
     The present invention provides a solution to this problem, by providing a unique temperature indicating means. Such indicating means are shown in FIGS. 2A through 2C. FIG. 2A illustrates one such indicating means  50  that comprises a flat strip having a front face  51  and an opposing rear face  52  that preferably supports a layer of adhesive (not shown). The front face  51  of the indicator  50  has a series of temperature markings in the form of numerals  53  disposed thereon in ascending order, and each such numeral corresponds to a particular temperature. 
     These temperature numerals  53  may be separated, as shown, at a chosen point by a line of demarcation  54  that divides the temperature range into two portions  55 ,  56 . The first of these two portions  55  may include temperatures that are equal to or are above the minimum application temperature for the foam components and thus indicate to the user that the foam components may be properly reacted and dispensed as a foam. The second of these two portions  56  may include temperatures that are below the minimum application temperature for the foam components and thus indicate to the user that the foam components, if reacted, shall not dispense a foam with expected quality and yields. It will be understood that at such temperatures, foam application may still occur, but at lower yields and quality. Additional markings  57 ,  58  may be included as part of the visual indicia that indicate, in the form of text, such as by “SPRAY ZONE”  57  and “TOO COLD”  58 , the proper and improper dispensing temperatures. 
     FIG. 2B illustrates another style of temperature indicator  60  that is also easily affixed, by way of an adhesive backing (not shown) to a foam component supply container. In this style indicator  60 , the visual indicia  61  is arranged at the line of demarcation  62  and indicates the temperature range in numerals  63  in both the Fahrenheit and Celsius temperature scales  64 ,  65 . The range of proper foam components dispensing temperatures may be bracketed by markings, shown as bars  66 , of a contrasting color. 
     FIG. 2C illustrates yet another style of temperature indicator  70 , also with an adhesive backing (not shown) that may be fixed to a foam component supply container. This style indicator has only minimum visual indicia, that indicate only the threshold application temperature  71  and line of demarcation  72  on that front face  73  of the indicator  70 . 
     In all of the aforementioned indicators,  50 ,  60 ,  70 , a layer having a liquid crystal display (LCD) is incorporated into the indicator. As is known in the art, this LCD type material is a compound that produces a visible color change in response to a temperature activation. When activated, the temperature sensitive substance emits or reflects visible light radiation to indicate temperature. The color sequence of normal temperature activation may be structured to present tan, red, green, blue and ultraviolet. The colors may be filtered to obtain a desired color sequence. Alternatively, a thermochromic strip may also be employed that is tailored to respond by color change along its length in a predetermined fashion in response to temperature changes. 
     The LCD material on the temperature indicator that is in contact with the exterior surface of the supply containers  81 ,  82  may possess the ability to change from among many different preselected colors to indicate the temperature of the material in contact with it, i.e., the contents of the supply containers  81 ,  82 . For example, it may adopt a green color where the temperature of the component is exactly the temperature shown by the number on the indicator, and it may also adopt, for example, a tan color where the temperature range of the supply component is above the actual temperature. 
     It will be understood that such temperature indicators of the invention may not utilize the line of demarcation and may only utilize a single temperature marking such as the proper application temperature, a text marking such as “GOOD” or the like. 
     Referring now to FIGS. 3 and 4, one embodiment of an improved foam dispensing apparatus  80  constructed in accordance with the principles of the present invention is shown. The apparatus  80  is particularly suitable for the two-handed dispensing of multi-component fluent materials, such as polyurethane foams and the like. The apparatus  80  includes a pair of distinct, vertically arranged foam supply canisters  81 ,  82  which contain the foam supply components which, when mixed and reacted together form a foam. These separate containers  81 ,  81  store the liquid foam components of the foam, preferably in a pressurized state, one of the two components typically being an isocyanate component and the other component typically being a liquid resin solution. 
     In this embodiment, the foam component supply containers  81 ,  82  are held by a carrier, in the form of a carton  100  in an inverted orientation, and each supply container  81 ,  82  may include a valve  83 ,  84  operatively associated therewith for releasing the reactive components out of the supply containers  81 ,  82  under pressure. The supply containers  81 ,  82  may be interconnected together near their valves  83 ,  84  by a yoke  85  that maintains the position of the supply containers  81 ,  82  in the carton  100 . Two supply hoses, or tubes  86 ,  87  attach to the supply container valves  83 ,  84  and exit from the carton  80  through an opening (not shown) to mate with a dispenser  90 . 
     The dispenser  90  shown takes the form of a gun-style dispenser having a handle  91  with an actuatable trigger  92  that opens two ports to permit the reactive components to pass into a barrel portion  93  that includes a hollow mixing chamber (not shown). The dispenser  90  also typically includes either a fixed or replaceable dispensing nozzle  94  with a dispensing tip  95 . 
     The temperature indicators  50  may be adhesively affixed to the exterior surfaces  101  of one or both of the supply containers  81 ,  82 . In order to facilitate the reading of the visual indicia of the temperature indicator  50 , the carton  100  may be provided with one or more windows  102  formed in a sidewall  103  thereof. The carton  100  may also include a handle assembly  110  that protrudes through the top of the carton  100  so that carton may be held by a user with one hand, while the dispenser  90  may be held with the other hand. Each window  102  is preferably slightly larger in size than the indicator(s)  50  so that a user may easily read all of the visual indicia on the temperature indicator  50 . The window may also be of a larger size than shown to permit viewing from the exterior of the carton  100  of the supply containers  81 ,  82 , their valves  83 ,  84  and other components of the apparatus  80 . 
     Whereas the supply containers  81 ,  82  of the embodiment illustrated in FIGS. 3 and 4 are shown in an inverted orientation, they may also be held in an upright orientation, as illustrated by the second embodiment of an apparatus  200  illustrated in FIG.  5 . In this embodiment, the apparatus  200  includes a carrier  220  that includes a yoke member  201  that holds the two supply containers  202 ,  203  together in an upright orientation and a handle assembly  221  that is connected to the yoke member  201 . Two supply tubes  204  lead from valves  206 ,  207  of the containers to a detachable dispenser  208 , having a replaceable dispensing nozzle  210  and a cam actuator  211  that may be manipulated by a user&#39;s finger. More details on the construction of this type structure may be found in U.S. Pat. No. 5,344,051, owned by the assignee of the present invention, and the disclosure of which is hereby incorporated herein by reference. One or more of the supply containers  202 ,  203  may have a temperature indicator  50  applied to their exterior surface. 
     A third embodiment of a dispensing apparatus  300  constructed in accordance with the present invention is illustrated in FIG.  6 . In this apparatus  300 , the two supply containers  301 ,  302  are held in an upright position by means of a carrier  303  having a handle portion  320 , and the dispenser  305  takes the form of a hand-held gun dispenser, similar to that shown in FIGS. 3 and 4. Two supply tubes  309 ,  310  lead from the supply containers  301 ,  302  to the dispenser  305 . The carrier  303  that holds the supply containers  301 ,  302  in place may have a shoulder strap  310  that permits a user to sling the dispenser over his shoulder during use. Temperature indicators are located on the exterior surface of the supply containers  301 ,  302 . 
     Although described above in terms of two container assemblies, it will be understood that the present invention also finds application in association with a single reactive foam component supply container, regardless of the size of the container. In this instance, the indicator is also affixed to the exterior of the supply container as shown in any of the Figures and will indicate to a user whether or not the foam component, when used, shall meet the user&#39;s expectations. Such a single supply container may be incorporated with a carrier assembly for a dispensing apparatus as shown, or the supply container may be one that can be used later with such a dispensing apparatus. 
     While the preferred embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that the embodiments are merely illustrative of some applications of the principles of the present invention and that changes and modifications may be made therein without departing from the spirit of the invention, the scope of which is defined by the appended claims.

Technology Category: 7