U.S. patent number 3,839,127 [Application Number 05/366,157] was granted by the patent office on 1974-10-01 for adhesive applicator.
This patent grant is currently assigned to Minnesota Mining and Manufacturing Company. Invention is credited to Raymond W. Hazuka, Dorman N. Thompson, Jr..
United States Patent |
3,839,127 |
Hazuka , et al. |
October 1, 1974 |
ADHESIVE APPLICATOR
Abstract
An adhesive applicator for manually dispensing varying lengths
of adhesive supplied in the form of a transfer tape including a
layer of pressure-sensitive adhesive releasably carried by a waste
liner. The applicator supports a roll of transfer tape and defines
a path for the transfer tape past an applying edge disposed along a
dispensing edge of the body intermediate its ends and a deflecting
member or plow directs the waste liner away from the edge as the
tape is drawn about said applying edge. The deflecting member
cannot be spaced too far from the dispensing edge of the applicator
or too close to the applying edge or the liner is deflected too
sharply and application of the adhesive is slowed. The deflecting
member is shaped and mounted with respect to the body of the
dispenser such that waste adhesive unavoidably carried past the
applying edge on the liner does not cause the liner to become
jammed in the deflecting path.
Inventors: |
Hazuka; Raymond W. (West St.
Paul, MN), Thompson, Jr.; Dorman N. (Oakdale, MN) |
Assignee: |
Minnesota Mining and Manufacturing
Company (St. Paul, MN)
|
Family
ID: |
23441886 |
Appl.
No.: |
05/366,157 |
Filed: |
June 1, 1973 |
Current U.S.
Class: |
156/540; 156/767;
156/577 |
Current CPC
Class: |
B65H
37/007 (20130101); B65H 35/0033 (20130101); Y10T
156/1705 (20150115); Y10T 156/1994 (20150115); Y10T
156/1795 (20150115) |
Current International
Class: |
B65H
35/00 (20060101); B65H 37/00 (20060101); B29d
027/14 (); B32b 035/00 () |
Field of
Search: |
;156/584,577,540 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Drummond; Douglas J.
Attorney, Agent or Firm: Alexander, Sell, Steldt & De La
Hunt
Claims
1. An adhesive applicator for dispensing and applying an adhesive
of a transfer tape including a layer of pressure-sensitive adhesive
releasably carried by a waste liner to a receptor surface, said
applicator comprising
a monolithic molded body comprising
support means defining a support surface for a convolutely wound
roll of adhesive transfer tape wherein the liner is on the outer
exposed surface,
an applying edge means spaced from said support means and disposed
along a dispensing edge of said body intermediate the ends of said
applying edge means for engaging transversely the outer surface of
said liner and for applying the adhesive layer to a receptor
surface, and
guide means mounted on said body for deflecting said liner from a
said receptor surface as the liner moves past said applying edge
means, said guide means comprising a deflecting member having a
separating edge connecting a stripping surface, disposed in spaced
relationship from a further guide surface on said body, and an edge
surface spaced from said dispensing edge of said body, and said
deflecting member projecting from a support toward said applying
edge means and defining between said stripping surface and said
further guide surface a path for said liner, said stripping surface
being disposed at an angle of not greater than 45.degree. relative
to the dispensing edge of said body and positioned in a plane
disposed at an angle of at least 20.degree. in relationship to
2. An applicator according to claim 1 wherein said separating edge
is
3. An applicator according to claim 1 wherein said applying edge
means comprises a support and a projecting semicylindrical lower
edge having a
4. An applicator according to claim 1 wherein said separating edge
of said deflecting member is spaced at least 0.035 inch from the
forward edge of
5. An applicator according to claim 1 wherein the width of said
stripping
6. An applicator according to claim 4 wherein said separating edge
is defined by a radius surface having a radius of about 0.016 inch.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an adhesive applicator for
dispensing varying lengths of pressure-sensitive adhesive to a
surface and in one aspect relates to an improved hand applicator
for dispensing and applying pressure-sensitive adhesive transfer
tape which will afford the easy threading and continued operation
even in the event of inadvertent carryover of the adhesive past the
applying edge on the applicator.
2. Description of the Prior Art
While the art is replete with dispensers for applying manually
desired lengths of pressure-sensitive tape to a surface there are
fewer dispensers specifically designed for the easy application of
a layer of pressure-sensitive adhesive which layer, prior to
application, is releasably supported on a length of waste liner
which is suitably coated on both surfaces with a back sizing such
that the pressure-sensitive adhesive layer will be more easily
released from the uncoated surface than the adhesive coated surface
permitting the tape to be convolutely wound in a supply roll. A
transfer tape dispenser is shown in U.S. Pat. No. 3,274,038, issued
to A. B. Karn, Sept. 20, 1966. This dispenser comprises a body
adapted to support a supply roll of tape material and to be
operated by hand for manually applying a length of adhesive to a
surface. The tape is withdrawn from the supply roll past an
applying edge and operation of the dispenser causes the liner to be
pulled from the adhesive and carried about the supply roll. In this
device the tape is wound with the adhesive surface of the transfer
tape on the outer surface of the roll and this adhesive pushes the
waste liner out of the dispenser after the same has been drawn
about the supply roll. This dispenser has several disadvantages.
One apparent disadvantage is the threading of the supply of tape
through the dispenser. If this threading operation is done by the
manufacturer the same is difficult to accomplish mechanically. If
the threading is to be handled by the consumer the threading will
seldom be handled in a manner such that adhesive on the outer
surface of the liner will not be forced into the guide path for the
separated liner. Adhesive in this area will quickly cause the liner
to become jammed and operation of the dispenser to be impaired.
Further, the operation of the dispenser is such that the operator
cannot readily view the layer of adhesive immediately upon
application to a receptor surface.
Two dispensers for double coated tapes which utilize a waste liner
which must be separated from the tape upon application of the tape
are shown in U.S. Pat. No. 3,283,886, issued to E. C. Addis, et
al., Nov. 8, 1966, and U.S. Pat. No. 3,468,743, issued to C. A.
Soriano on Sept. 23, 1969. In each of these latter two patents the
liner is separated from the tape and is directed through a confined
pathway away from the tape such that the same may be severed and
discarded. The dispensers do not afford the application of force
against the liner to force the adhesive tape into contact with the
receptor surface such that strips of a desired length may be
applied by the dispenser as the tape is dispensed from the supply
roll. Thus, these dispensers do not afford any teaching for
modifying a transfer tape applicator such that the same will afford
easy application of the adhesive, assure separation of the liner
from the adhesive immediately upon pressure application of the
adhesive, and directing the waste liner along the path away from
the receptor surface such that the adhesive may be applied at a
reasonably moderate speed.
Dispensers having a restricted path for the liner causes the liner
to become jammed when any amount of adhesive is inadvertently
carried by the liner into the confined guide path and it is
necessary with transfer tape that the adhesive be applied to the
receptor surface simultaneous with the separation of the liner.
Thus a dispenser such as disclosed by either Addis, et al., or
Soriano does not afford any teaching for a person skilled in the
art in the direction toward a simple dispenser such as that of
applicants'.
SUMMARY OF THE INVENTION
The applicating device of the present invention for applying an
adhesive coating from an adhesive transfer tape having at least two
separable layers, including a waste liner and a layer of
pressure-sensitive adhesive comprises a monolithic molded body
having means for supporting a supply roll of transfer tape, an
applying edge along the dispensing edge of the applicator and a
deflecting member or plow for deflecting the waste liner away from
the adhesive immediately after application of the adhesive and
outward from the dispenser. The dispenser is so designed that the
operator can see readily the layer of adhesive applied as the
dispensing device is drawn toward him. The applicator also affords
the easy threading by the operator and is so designed that the
liner cannot readily become jammed. The applicator is so designed
that the inadvertent movement of adhesive past the applying edge
and into the guide means for deflecting the liner will not cause
the liner to become jammed. The deflecting member is positioned
relative to the applying edge such that the liner movement is
relatively unobstructed and threading and clearing the applicator
of adhesive is handled with facile instruction. The deflecting
member desirably does not exceed one-half of the width of the
transfer tape and is a rigid wedge-shaped member having a
separating edge positioned between a stripping surface and an edge
surface. The edge surface is positioned close to the dispensing
edge of the body member along which edge the applying edge is
positioned. The stripping surface is disposed at an angle with
respect to the dispensing edge to deflect the liner away from the
receptor surface. The stripping surface is disposed at an angle to
the dispensing edge not exceeding 45.degree. such that there is
substantially no opportunity for the liner to become folded,
permitting the same to pass between the edge surface of the
deflecting member and the receptor surface .
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be more fully described in the following
detailed description which refers to the accompanying drawing
wherein:
FIG. 1 is a perspective view of the dispensing device of the
present invention;
FIG. 2 is a side elevation view of the dispensing device of FIG.
1;
FIG. 3 is a front elevation view partly in section to show the
support for the tape roll and showing a fragment of the display
card;
FIG. 4 is a bottom view of the dispensing device of FIG. 1 showing
also a display card; and
FIG. 5 is a detailed view of the liner deflecting member and
adhesive applying edge.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The applicating device of the present invention is a molded
monolithic member which desirably is economical enough to be sold
with a roll of transfer tape and discarded after the roll of tape
is depleted.
The roll of tape is usually supplied in a convolutely wound roll on
a core 11 and the tape 12 comprises at least two separable layers,
including a waste liner 13 upon one surface of which is releasably
adhered a layer of pressure-sensitive adhesive 14. In the roll the
liner is radially outward of the adhesive and the liner is suitably
coated on its outer surface such that the pressure-sensitive
adhesive coating will not adhere firmly thereto. The transfer tape
may comprise a backing material, i.e., a paper waste liner, having
a layer or coating of a solvent-free, tacky coherent material
comprising a blend of polymers. One such tape combination is
disclosed in U.S. Pat. No. 3,326,741, issued June 20, 1967.
The applicator of the present invention is generally designated by
the reference numeral 15 and comprises a molded monolithic body
including a generally planar plate portion 16 having an outline
describing generally the shape of the dispenser and from which
plate project in one direction side walls and support members to
support and enclose a roll of transfer tape 12. Generally centrally
of the plate portion 16 is a support member or mandrel 17 for
supporting the core 11 of the transfer tape 12. As illustrated, the
mandrel 17 comprises a generally cylindrical wall projecting from
the plate 16. The wall is not continuous and is not supported from
the plate adjacent the ends. Formed at the ends of the wall are
bosses 19 which project outward from the wall for engagement with
the core 11. The resilience of the end portions of the wall members
force the projecting bosses into frictional engagement against the
inner cylindrical surface of the core 11 to retard the free
rotation of the core.
Other projecting wall members 21, 25, 27, and 32 form an outer wall
about the tape and define a cavity within which the roll is
positioned. This cavity has one opening 28 disposed along a lower
or dispensing edge of the applicator. This dispensing edge is
defined by the lower extremity of a heel and toe formed on the
applicator. The opening 28 is defined by the end of wall 21 and by
the smooth arcuate wall 25 defining an applying edge across which
the liner 13 is directed, thus disposing the adhesive layer 14 for
contact with a receptor surface 30, see FIG. 3.
The applying edge 25 is a rounded or radiused surface and defines
an edge which is generally in a plane connecting the heel and the
toe of the applicator or projects slightly outward from the plane
such that as the liner is drawn across the applying edge the
adhesive may be applied with greater pressure into engagement with
the receptor surface. The radius on the applying edge may be about
0.37 inch. This applying edge may also have a small semicylindrical
projection 35 with a radius of about 0.06 inch to project beyond
the dispensing edge a distance substantially equal to the radius.
This applying edge 25, 35 permits the placement of a deflecting
member in closely spaced relation thereto as will be hereinafter
described.
The applicator heel is formed by the wall 27 projecting away from
the wall 21 at the rear of the applicator and connecting again to
the wall at the opening 28. The toe 29 is supported from the
forward end of the applicator and extends toward the dispensing
edge terminating in a position spaced on the side of the applying
edge 25 opposite from the heel.
The wall 32 forms part of a guide means for directing the liner
away from the receptor surface 30 upon application of the adhesive.
The wall 32 projects at an incline forwardly relative to the
dispensing edge of the applicator and defines one side of a path
for the waste liner. The toe 29 is supported on one side of this
wall 32 to guide the liner and a forwardly projecting tab 36 is
disposed on the opposite side of the wall surface 32 to guide the
opposite edge of the liner.
The guide surface 32 on the body of the applicator is positioned on
an incline with respect to the bottom edge of the applicator at an
angle of approximately 60.degree.. A deflecting member or plow
generally designated 39 is positioned in spaced relationship from
the surface of the applying edge where the liner can first be
lifted from the adhesive by a separating edge 40 connecting an edge
surface 42 that is spaced from the dispensing edge of the body and
a stripping surface 44. The separating edge 40 of the plow is
spaced from the nearest surface permitting a lifting of the liner
by at least 0.035 inch and not more than about 0.25 inch. In a
preferred example it is positioned in spaced relation from the
rounded projection 35 by 0.049 inch along the line connecting the
center of the rounded applying edge 35 and the center of the radius
defining the separating edge 40 of the plow 39. The plow is
generally wedge-shaped. It has a width of about 0.06 inch and this
width preferably does not exceed one-half of the width of the
transfer tape and is centrally positioned along the path of the
tape. The plow is cantilevered mounted at its forward end, opposite
the stripping edge 40 by an L-shaped bracket 41. The plow is
supported with sufficient rigidity to avoid displacement by
movement of the liner over its separating edge and stripping
surface. The separating edge 40 should not be spaced from the
dispensing edge more than 0.028 inch. The stripping surface 44 of
the plow, which is in a plane disposed at an angle .alpha. of at
least 20.degree. with relation to the guide wall 32 of the
applicator is disposed at an angle .beta. relative to the edge of
the applicator which angle .beta. should not exceed 45.degree.. The
stripping surface is preferably located so that the liner to be
stripped is not folded at an angle greater than 45.degree. from the
applicating edge. The separating edge of the plow has a radius of
about 0.016 so that it will not tend to penetrate the liner and
small enough that the liner is not folded too sharply between the
surface of the applying edge and the stripping surface of the plow.
The angle .alpha. permits a broad opening along the guide means
such that any adhesive carried by the liner inadvertently past the
applying edge will not tend to jam the liner between the guide
surface and the plow.
In the applicator illustrated a number of wedge-shaped projections
46 extend from the open side of the applicator and are designed to
penetrate a support card 47, a fragment of which is shown in FIG.
2. This card will support the applicator for display and will be
perforated along a line conforming to the outline of the plate 16
to form a back for the body.
During operation the operator places the applying edge 25, 35
against the receptor surface as shown in FIG. 3 and draws the
applicator toward him. The movement peels the tape from the roll
and the applying edge and the deflecting member separates the liner
from the adhesive and drives it out of the applicator. The wall 32
and wall 21 can intersect at a definite edge 50 which can serve as
a cutting edge for the liner.
Having thus disclosed the present invention with reference to a
preferred embodiment it will be appreciated that the invention is
not limited thereby and that modifications can be made without
departing from the invention as described in the following
claims.
* * * * *