1. Field of Invention
The present invention relates to dispensing tape in general and in particular to a method and apparatus for dispensing non-adhesive tapes.
2. Description of Related Art
Pipes are often connected to each other by threaded ends. It is known that for such connections a threaded seal tape is typically used to seal the connection. A commonly used threaded seal tape is polytetrafluoroethylene tape or PTFE tape commonly known as plumbers tape or Teflon® tape. PTFE tape is typically sold in a roll having a hole through the middle. In use, the PTFE tape may be wrapped around the exposed end of the threads of a pipe before it is screwed into an adjoining connector or pipe. A typical method of wrapping PTFE tape is for the user to grip the roll of PTFE tape between their thumb and one of their fingers. The user may then apply frictional resistance to the unwinding of the tape by squeezing the roll of PTFE tape therebetween.
PTFE tape is known to have low friction for lubricating the connection between the pipes. PTFE tape also typically does not use an adhesive to secure it to the pipe, but rather while the PTFE tape is being wrapped around the pipe, tension is applied to the tape to pull the tape into the threads and plastically deforms the tape to the threads.
A common problem with PTFE tape is the fact that it lacks an adhesive. This may result in the tape freely unraveling from the roll if it is inadvertently released by the user. This may result in excessive amounts of tape unwound from the roll which may then become dirty or tangled. Such tangled portions of the tape are often discarded and therefore wasted.
An additional difficulty with PTFE tape is the fact that it is applied by the user applying a tension to the tape so as to deform the tape into the threads. Because PTFE tape has no adhesive and therefore no resistance to being freely unwound from the roll, the PTFE tape itself does not provide a tension to the tape to secure it to the threads. It is therefore required that the user apply an appropriate level of tension to the tape for application to the threads. Tension is typically applied by the user maintaining a frictional grip on the roll as the tape is unwound therefrom. The user may therefore control the amount of friction applied to the tape by controlling their grip on the roll. This may be difficult to accurately or consistently control in many situations or for people with less experience and practice.
According to a first embodiment of the present invention there is provided a method for dispensing non-adhesive tape carried on a spool to an article wherein the spool has a spool bore therethrough. The method comprises providing a casing having a casing bore therethrough wherein the casing resistively and rotatably supports the spool around the casing bore. The method further comprises supporting the casing on a support member located within the casing bore and securing a free end of the tape to the article through a dispenser portion of the casing. The method further comprises rotating the spool within the casing as to unwind the non-adhesive tape while the casing is moved around the article with the dispenser portion maintained in radial alignment with the article.
The support may comprise a finger of a user. The dispensing portion may compressibly grip the non-adhesive tape. The casing may rotate around the support while the casing is moved around the article. The casing may rotate on the support. The casing may rotate on a bearing secured to the support
According to a further embodiment of the present invention there is provided an apparatus for dispensing non-adhesive tape carried on a spool to an article wherein the spool has a spool bore therethrough. The apparatus comprises a′ casing having a casing bore terethrough adapted to rotatably receive a support member therein. The apparatus further comprises a spool support for resistively and rotatably supporting the spool around the casing bore and a dispenser portion located in the casing for dispensing the non-adhesive tape therethrough.
The support member may comprise a finger of a user. The casing may include a hub being concentric with the spool.
The casing may include a sleeve having the casing bore therein wherein the casing is rotatable about the sleeve. The sleeve and the casing may include a bearing therebetween. The sleeve may have a central axis wherein the casing is rotatable about the sleeve about the central axis. The spool may be rotatable about the central axis. The sleeve may be adapted to grip the support member. The sleeve may be adapted to slidably receive the support member.
One of the spool or the casing may include a biased protrusion adapted to engage one of a plurality of corresponding notches in the other of the spool or the casing. The plurality of notches may be oriented radially around the casing bore such that rotation of the spool within the casing will cause the protrusion to engage successive notches. The notches may be located on the hub, wherein the protrusion radially extends inwardly from the spool. The spool may include a spool axis and sidewalls perpendicular thereto. The notches may be located on at least one inner surface of the casing adjacent to the spool wherein the protrusion extends from a corresponding sidewall to the at least one inner surface.
The notches may be located on at least one side wall wherein the protrusion extends from a corresponding inner surface of the casing to the at least one sidewall.
The spool may include an inner cylinder. The casing may include first and second sides wherein the inner cylinder is frictionally engaged by the first and second sides of the casing. The apparatus may further comprise friction assisting pads between the inner cylinder and the first and second sides of the casing.
The spool includes side walls extending radially from the inner cylinder. The casing includes first and second sides wherein the side walls are frictionally engaged by the first and second sides of the casing. The apparatus further comprises friction assisting pads between the side walls and the first and second sides of the casing. The dispenser portion may frictionally bear against the non-adhesive tape passing therethrough.
In drawings which illustrate embodiments of the invention wherein similar characters of reference denote corresponding parts in each view,
a is an side elevation view of the apparatus of
b is an side elevation view of the apparatus of
Referring to
The apparatus 10 comprises a casing 20 supporting a spool (as shown in
In operation, a user may place their finger through the finger hole 30 and apply an end of the PTFE tape to the threaded end 12. Thereafter the user may run their finger in a substantially circular motion around the threaded end as indicated by arrow 56 such that the dispensing portion 24 is maintained as the most proximate portion of the apparatus 10 to the threaded end 12. Accordingly, it will be appreciated that the apparatus 10 is retained in a radial orientation as indicated by the arrow 58 about the threaded end 12 of the pipe 8 by the PTFE tape 14 remaining in radial alignment with the pipe 8.
Turning to
The front casing 40 comprises an annular front plate 42 adapted to retain the spool 80 of PTFE tape 14 between the front plate 42 and the backing plate 32. The front casing also includes a front enclosing wall 44 extending from the peripheral edge of the front plate 42. The front enclosing wall 44 includes a distal edge 43 adapted to engage the distal edge 19 of the rear enclosing wall 18. The front plate 42 also has a front bore 46 therethrough defined by an inner edge 45 of the front plate 42. The front bore 46 corresponds with and is adapted to engage with the end edge 39 of the spool support sleeve 34. The finger sleeve 50 comprises a cylindrical body having inner and outer surfaces 52 and 54, respectively wherein the inner surface 52 defines the finger hole 30.
The spool 80 of PTFE tape 14 comprises a central cylinder 82 having an outer surface 84 around which the PTFE tape 14 is wound and an inner surface 86. The spool 80 may optionally include first and second side walls 88 and 90, respectively. It will be appreciated that the PTFE tape 14 may be wound directly onto the outer surface 84 of the cylinder 82. Optionally, the PTFE tape 14 may be wound onto a disposable cylinder that is secured to the central cylinder 82 such that existing spools of PTFE tape 14 may be used in the current apparatus without modification or such that replacement spools of PTFE tape may be inserted into the apparatus 10.
The apparatus 10 is assembled by locating the spool 80 of PTFE tape 14 on the outer surface 36 of the spool support sleeve 34. The front casing 40 is then secured to the back casing 22 such that the end edge 39 of the spool support sleeve 34 engages the inner edge 45 of the front plate 42 and the distal edge of the back enclosing wall 18 engages the distal edge 43 of the front enclosing wall 44. The front casing 40 may be secured to the back casing by providing a clip on one of the front or back casing that engages a corresponding catch or by any other known method of securing two halves of a casing together. The finger sleeve 50 is then located within the casing 20 such that outer surface 54 is supported within the bore defined by inner surface 38 of the spool support sleeve 34. The finger sleeve 50 may be secured within the casing 20 with a locking ring 53. As illustrated, the finger sleeve 50 may include clips 55 at a free distal end 57 thereof for engaging the locking ring. As illustrated in
Referring to
Turning now to
The amount of resistance between the spool 80 of PTFE tape 14 and the back casing 22 is provided by a resistive device as further described below and should be selected to prevent the PTFE tape 14 from freely unrolling. In practice the amount of resistance between the spool 80 of PTFE tape and the back casing 22 should be selected such that the PTFE tape 14 will not freely unravel from the apparatus 10 should the apparatus be dropped by the user. Put another way, the amount of resistance between the PTFE tape and the backing body constitutes a braking mechanism and should be sufficient to support the weight of the apparatus 10 and the spool 80 of PTFE tape 14 when the apparatus is suspended by the free end 15 of the PTFE tape 14.
In some embodiments, the amount of resistance between the spool 80 of PTFE tape 14 and the backing body should be selected to ensure that a desired amount of tension is applied to the PTFE tape 14 when in use by a user such that the PTFE tape 14 is embedded within the threads of the pipe 8. The amount of resistance should also be selected to be high enough to support the weight of the apparatus 10 with a full spool 80 of PTFE tape 14 includes so as to prevent the unwinding of the PTFE tape 14 from the apparatus should the user let go of the apparatus when a free end of the PTFE tape is secured to the article. In addition, the amount of tension applied to the PTFE tape 14 should be less than the tensile strength of the PTFE tape 14 so as to prevent unwanted breaking of the PTFE tape during application to an article. It will be appreciated that the actual amount of resistance provided by the apparatus should therefore be selected based upon the type, width and thickness of the adhesiveless tape with which the apparatus is intended to be used.
The spool support sleeve 34 is also rotatable relative to a finger of a user located in the finger hole 30. This may be accomplished by permitting the finger sleeve 50 to rotate relative to the spool support sleeve 34. In such embodiments the finger sleeve 50 may be sized to snuggly surround the finger of a user. In such an embodiment, the close snug fit of the finger sleeve 50 on the finger of the user will also assist in preventing the user from inadvertently dropping the apparatus 10. Roller bearings, journal bearings or bushings may be utilized to permit rotation of the spool support sleeve 34 on the finger sleeve 50. A pad 31 or other similar cushioning device may be provided within the finger hole 30 so enable the finger hole 30 to snugly accommodate a variety of finger sizes. Optionally, a biased member 33 spanning the finger hole as illustrated in
As illustrated in
As illustrated in
In an alternative embodiment as illustrated in
Turning now to
With reference to
In other embodiments, the casing 20 will be unopenable so as to be a disposable unit in which the spool 80 of PTFE tape is not to be refilled. In such embodiments, finger sleeve may be supported by both the front and back casings 40 and 22. It will be appreciated that in such embodiments, the end flange 51 of the finger sleeve may bear against the front plate 42 as illustrated in
Turning now to
It will be appreciated that some embodiments of the present invention will be adapted to be able to receive existing PTFE tape rolls. It will also be appreciated that in other embodiments of the present invention, the PTFE tape roll may be manufactured as a combined article for disposal after use. In such embodiments the exterior components of the apparatus may be permanently affixed to each other. In addition, the roll of PTFE tape for such embodiments may also include one or more part of the indexing or breaking mechanism as described above for use specifically with such a unitary article.
It will also be appreciated that specific rolls of PTFE tape including such indexing or breaking mechanism may also be provided for use as a replaceable roll for a corresponding apparatus.
Although the present disclosure describes polytetrafluoroethylene tape, or PTFE, it will be appreciated that the apparatus and method will be useful in association with other types of adhesiveless tapes as well such as anti-seize tape including, by way of non-limiting example, other PTFE tapes including, PTFE tapes having nickel, copper or ceramics included therein as well as ribbons.
While specific embodiments of the invention have been described and illustrated, such embodiments should be considered illustrative of the invention only and not as limiting the invention as construed in accordance with the accompanying claims.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CA2009/000436 | 4/15/2009 | WO | 00 | 12/2/2010 |
Number | Date | Country | |
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61129194 | Jun 2008 | US |