Abstract:
A handheld dispenser of pressure sensitive adhesive tape comprising a handle and a rotating spool holder including a brake plate and holding a roll of pressure sensitive adhesive tape on the tape spool holder, and a cutting blade, an idler pulley, and a finger activated trigger stopping the motion of the tape supply reel by engaging the brake plate through actuating a lever coupling the brake plate and the trigger, thus stopping the dispensing of tape when the trigger is pressed by a finger.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a continuation-in-part of application Ser. No. 12/913,365 filed Oct. 27, 2010, the contents of which are hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     This description relates generally to handheld tape dispensers and more specifically to the dispensing mechanisms. 
     BACKGROUND 
     A common type of packaging is corrugated boxes. These packages are sealed prior to storage or shipment and much of the sealing is done with pressure sensitive adhesive tape, which is simply cellophane backed adhesive tape. Previously, while there are various types of hand held versions of dispensers for pressure sensitive tape, current designs employ a spatula and or a retractable cutter that protrudes via pressure being exerted on the spatula. This requires the user to apply a perfect balance of pressure to the spatula and toward the cutter and position the dispenser at the perfect angle. The desired result is a clean cut in the tape at the desired length applied to the package. 
     All too often, if the balance of pressure and the angle is not correct, the result is the tape cut being longer than the desired length or a cut that is frayed by the jagged cutting blade. Moreover, the various manufactures of pressure sensitive tape have different strengths of adhesive, different tape materials, and different thicknesses resulting in variability that changes the user&#39;s technique to yield an acceptable cut. 
     U.S. Pat. No. 4,762,586 to Wilkie (1988) has a manually operated trigger that operates the cutter, but does not lock the roll of tape. If the cutter isn&#39;t applied just right, the tape will continue to dispense, resulting in excess tape with a less than perfect cut. 
     Prior art also includes various adjuncts such as U.S. Pat. No. 7,506,835B2 to Huong (2009) and U.S. Pat. No. 5,110,401A Huang (1992) and U.S. Pat. No. 5,564,645 to Lissoni (1996) that apply friction to the tape reel to maintain a uniform tension. This approach is helpful to keep the tape taut while applying the tape around the right angles of the container, but doesn&#39;t positively stop the tape for cutting. There is a delicate balance of how much tension to put the spool holding the roll of tape. With too little tension, the tape roll continues spinning after the cut because of the sudden loss of tension. When the tape roll spins, the tape unravels and becomes entangled. When this occurs, the user must locate the end of the tape on the roll and rethread it through the dispenser. Conversely, with too much tension on the tape reel, it requires excessive effort to dispense the tape. To complicate matters worse, the amount of effort to dispense the tape changes as the diameter of the roll changes. That is, the roll gets smaller as the tape is consumed. 
     The tape brake in U.S. Pat. No. 6,612,474B2 to Shah (2003) is suitable for a narrow tape dispenser common in an office environment. It relies on the strength of the user&#39;s two fingers to stop the dispensing of the tape. Furthermore, since it requires the user&#39;s hand to reach around the roll of tape, it is not practical for rolls with larger diameter or width such as the two inch wide tape used to close packages. 
     U.S. Pat. No. 3,374,139 to Fritzinger (1964) named Tape Dispenser with Hand Brake, applies variable pressure to increase tension or stop the dispensing of the tape. This mechanical design is very complex and relatively expensive to manufacture. This is evident by the lack of widespread commercialization. 
     Moreover, it often requires the user to exert increasing pressure as the desire for more tension increases. Lastly, the means used to increase tension and stop the tape when it comes in direct contact with the adhesive side of the tape thereby adversely affecting the strength of the adhesive and increasing the propensity to jamb or become tangled. 
     Accordingly, several objects and advantages of the invention are the ability of the user to decisively choose the exact point to terminate and then cut the tape. This is achieved with a single finger operated trigger that is accessible with the same hand that is holding the tape dispenser. Because of the slow speed the tape unwinds and the brake is sudden not gradual. With the dispensing of the tape halted, the user can then perform the cut at the desired point thus eliminated “run on” tape. 
     With the reel and supply roll positively stopped, the tape supply cannot keep spinning and tangle thus eliminating wasted tape. Additionally, there are fewer instances of tape becoming tangled eliminating the need to rethread the tape in the dispenser thus decreasing work stoppages and increasing productivity. 
     The advantage of a sudden stop is the same low strength effort is required to stop the tape from dispensing irrespective of tape thickness, materials, or quantity of the remaining tape on the roll. That is, the effort doesn&#39;t change as the size of the tape supply roll changes when it gets smaller as the tape is consumed. Moreover, the different types of tapes vary as to thickness and strength of material. The variability in materials will not change the effort required to depress the trigger and positively stop the tape from dispensing. 
     Positively stopping the dispensing of tape will also compensate for a dull cutting blade. That is, the dispenser will perform consistently when the cutting blade degrades. 
     The design of the tape break mechanism has fewer moving parts than its and is simpler to manufacture than previous devices that tension or stop the tape from dispensing. Moreover, the design uses the same simple procedure to load the tape as contemporary tape dispensers. The trigger and braking mechanism is contained within the contemporary design rendering it less vulnerable to destruction if dropped. 
     Further objects and advantages will become apparent from a consideration of the ensuring description. 
     SUMMARY 
     The following presents a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and it does not identify key/critical elements of the invention or delineate the scope of the invention. Its sole purpose is to present some concepts disclosed herein in a simplified form as a prelude to the more detailed description that is presented later. 
     In accordance with the invention, this device overcomes many shortcomings of prior versions of hand held pressure sensitive tape dispensers inasmuch as it has a user operated trigger that stops the tape reel from turning and allows a precise cut of the tape with less skill and effort. Furthermore, it tends to substantially reduce the instances of the tape becoming entangled in the dispenser and tends to reduce the need to rethread the tape. 
     Many of the attendant features will be more readily appreciated as the same becomes better understood by reference to the following detailed description considered in connection with the accompanying drawings. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The present description will be better understood from the following detailed description read in light of the accompanying drawings, wherein: 
         FIG. 1 . is an illustration of a conventional hand held pressure sensitive tape dispenser. 
         FIG. 2 . is a perspective of the left side of the present example of a tape dispenser with a trigger operated brake. 
         FIG. 3A . is a left side view of the trigger 
         FIG. 3B . is the rear side of the trigger. 
         FIG. 4A . is the rear view of the lever. 
         FIG. 4B . is the side view of the Lever. 
         FIG. 5A . is the top view of the brake plate. 
         FIG. 5B . is the side view of the brake plate. 
         FIG. 6A . is the side view of the cogged spool holder. 
         FIG. 6B . is the rear view of the cogged spool holder. 
         FIG. 7 . is the rear cutaway view of the present example. 
         FIG. 8  depicts a roll of pressure sensitive tape being installed onto an alternate example of having a flexible retaining clip (barbed) spool holder. 
         FIG. 9  depicts a roll of pressure sensitive tape after installation onto the cogged spool holder with the flexible retaining clip fully engaging the tape supply reel  18 . 
         FIG. 10  shows a side view of a cogged spool holder with anti-slip barbs. 
     
    
    
     Like reference numerals are used to designate like parts in the accompanying drawings. 
     DETAILED DESCRIPTION 
     The detailed description provided below in connection with the appended drawings is intended as a description of the present examples and is not intended to represent the only forms in which the present example may be constructed or utilized. The description sets forth the functions of the example and the sequence of steps for constructing and operating the example. However, the same or equivalent functions and sequences may be accomplished by different examples. 
       FIG. 1  is a depiction of a conventional handheld pressure sensitive tape dispenser. The dispenser is provided with a handle  17  and a tape supply reel  18 . The pressure sensitive tape supply is threaded from the reel  18  over an idler pulley  20  and behind the cutting blade  19 . 
       FIG. 2 . is a perspective of the left side of the present example of a tape dispenser with a trigger operated brake. As the tape is dispensed, the cogged spool holder  16  rotates counter clockwise. When the desired amount of tape has been dispensed, the user depresses the trigger  10 . The trigger  10  has a trigger guide rod  11  and a trigger return spring  12  to ensure smooth and consistent movement. 
     The trigger  10  pushes the lever  13  and the lever pulls the brake plate  15 . A raised portion of the brake plate  15  bearing curved teeth, slides into the curved teeth on the rotating spool holder  16 . The curved shape of the teeth on the brake plate  15  and the spool holder  16  allows the cogs to mesh together quickly and immediately stop the spool holder  16  from turning, thus stopping the dispensing of the tape. The user then exerts force to stretch the tape over the cutting blade  19  to cut the tape. 
     After the cut is complete, the user releases the trigger  10 , thereby permitting the trigger return spring  12  to restore the trigger to its normal position. The lever return spring  14  returns the lever  13  to its ready to use position and retracts the brake plate  15  teeth from the teeth of the spool holder  16 . The user may also stop the dispensing of tape to increase tension and release the trigger without cutting the tape. 
       FIG. 3A . is a left side view of the trigger  10 . 
       FIG. 3B . is the rear side of the trigger  10 . 
       FIG. 4A . is the rear view of the lever  13 . 
       FIG. 4B . is the side view of the lever  13 . 
       FIG. 5A . is the top view of the brake plate  15 . The plate  15  may be made of metal or equivalent material. The plate is generally planar with a raised portion  502  provided, in which one or more teeth  501  are disposed. A forked area  503  is provided to couple to an axle holding the cogged spool holder to a handle assembly (not shown). Alternatively an aperture, such as an oblong opening, may be provided to allow the teeth to engage the cogs (not shown). 
       FIG. 5B . is the side view of the brake plate  15 . The brake plate  15  is substantially flat with a raised portion  502 . The raised portion  502  may be formed from the same piece, or may be a separate piece that is attached to the flat portion. 
       FIG. 6A . is the side view of the cogged spool holder  16 . 
       FIG. 6B . is the rear view of the cogged spool holder  16 . 
       FIG. 7 . is a rear cutaway view of the present example. 
       FIG. 8  depicts a tape supply reel  18  being installed onto a cogged spool holder  16  of the present example. As the tape supply reel is installed onto the cogged spool holder  16 , one of a plurality of flexible retaining clips  21  deflect to allow the tape supply roll  18  to be seated into place. 
     Since the tape supply reel is loaded from one side and held in place on the cogged spool holder  16  by friction, the tape supply reel can potentially slip off or become misaligned on the spool holder during tape dispensing. When the spool of tape is not fully seated on the spool holder it pulls at an angle, creates creases, and can become entangled in the dispenser. The flexible retaining clips prevent the tape supply reel from disengaging the cogged spool holder or becoming misaligned. Barbs  801  help prevent spool movement as they snap over the rim of the reel when it is installed, and may easily be pushed inwards to release the spool. 
       FIG. 9  depicts a roll of pressure sensitive tape after installation onto the cogged spool holder of the present example, with one of a plurality of the flexible retaining clips fully engaging the tape supply reel  18 . Once the tape supply reel  18  is seated in place on the cogged spool holder  16 , the flexible retaining clips  21  spring back to their normal position to hold the tape supply roll  18  firmly in alignment with the cogged spool holder and prevent the tape supply roll from disengaging, becoming misaligned, or “walking off” the spool holder. 
     When the tape supply reel is depleted of tape, the remaining cardboard liner is removed from the cogged spool holder by pressing inward on the flexible retaining clips  21  and subsequently sliding the remaining cardboard liner off the cogged spool holder  16 . 
       FIG. 10  shows a side view of a cogged spool holder with anti-slip barbs. As tape is dispensed, the cogged spool holder  16  rotates counterclockwise. The anti-slip barbs may be angled in such a way as to engage the cardboard (or equivalent) liner, or core, of the tape supply reel (not shown). 
     Full reels of tape generally have sufficient rigidity to maintain their engagement with a cogged spool holder without anti-slip barbs; however, as the tape is consumed, the roll of tape loses rigidity and henceforth traction on the spool holder, allowing it to spin independently of the spool holder. The anti-slip barbs  22  “bite” into or otherwise engagedly couple the cardboard liner of the tape supply reel preventing it from turning independently of the cogged spool holder, thereby allowing the brake (not shown) when applied, to completely stop the dispensing of tape. The trilobular spool holder is shown with two barbs per lobe. Equivalently any convenient number of barbs may be provided on the lobes, and all lobes do not necessarily have to have equal numbers of barbs, 
     Those skilled in the art will recognize that the present examples provide a substantially easier to use and a more reliable means to dispense and cut pressure sensitive tape from a hand held dispenser. Furthermore, the trigger operated brake for a handheld tape dispenser has additional advantages of
         it decisively permits the cut off of the tape when the user chooses via a trigger;   it substantially reduces the need to untangle and rethread the tape;   it uses a small quantity of strength to operate the trigger from a single finger from the same hand to operate;   it works consistently with different thicknesses of tape;   it works consistently with different quantities of tape on a tape reel;   it is substantially simpler, has fewer moving parts, and is less expensive to manufacture than previous tape brakes;   it can also be used to stop the tape to add additional tension when going around the corners of a box;   it can positively engage the tape reel to prevent misalignment or loss of the tape reel.       

     While the above description contains many specificities, these should not be construed as limitations on the scope of the invention, but as exemplifications of the presently preferred embodiments thereof. Many other ramifications and variations are possible within the teachings of the invention. For example, range of motion of the trigger, length of the lever, the size and shape of the brake plate and the size and shape of the cogged spool holder. 
     Thus the scope of the invention should be determined by the appended claims and their legal equivalents, and not by the examples given.