U.S. patent number 3,708,833 [Application Number 05/124,066] was granted by the patent office on 1973-01-09 for separable fastening device.
This patent grant is currently assigned to American Velcro, Inc.. Invention is credited to Lauret H. Girard, Charles Kojabashian, William A. Ribich.
United States Patent |
3,708,833 |
Ribich , et al. |
January 9, 1973 |
SEPARABLE FASTENING DEVICE
Abstract
A separable fastening device having first and second separable
members wherein the first member has a surface of upstanding
spear-like protuberances extending from one broad surface of its
base and the second member has a surface of complementary engaging
elements. The spear-like protuberances are characterized by the
property that when the first and second separable fastener members
are pressed into face-to-face relationship the spear-like
protuberances on the first separable member penetrate the surface
of the second separable member and engage the complementary
engaging elements of the second separable member and resist
separation parallel to the interfacial plane of engagement but are
readily separable by peeling forces applied substantially normal to
this interfacial plane. The first separable member having a surface
of spear-like protuberances has particular utility as part of a
separable fastener having reticulated urethane foam as the second
complementary member, however it also provides a superior fastening
device when used with a second separable member having a surface of
complementary engaging elements in loop form.
Inventors: |
Ribich; William A. (Lexington,
MA), Kojabashian; Charles (Sudbury, MA), Girard; Lauret
H. (Bedford, NH) |
Assignee: |
American Velcro, Inc. (New
York, NY)
|
Family
ID: |
22412540 |
Appl.
No.: |
05/124,066 |
Filed: |
March 15, 1971 |
Current U.S.
Class: |
24/450 |
Current CPC
Class: |
A44B
18/0061 (20130101); Y10T 24/2775 (20150115) |
Current International
Class: |
A44B
18/00 (20060101); A44b 017/00 () |
Field of
Search: |
;24/204 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Gelak; Bernard A.
Claims
We claim:
1. In a separable fastening device having first and second
separable members wherein the first member has a surface of
upstanding engaging elements extending from one broad surface of
its base and the second member has a surface of complementary
engaging elements extending from one broad surface of its base
which are releasably interengageable with the engaging elements of
the first separable member, the improvement in the first separable
member comprising certain of said upstanding engaging elements
being flexible spear-like protuberances, each having:
a. a resilient stem supported at one end thereof on the base of the
first separable member;
b. a flexible spear-like head on the unsupported end of said stem,
said head having at least two radial extensions which slope from
the end of said stem toward the surface of the base and extend away
from said stem and are resiliently flexible relative to said stem,
a portion of each radial extension being of smaller thickness
adjacent to said stem than a corresponding portion along said
radial extension closer to the unsupported end, said spear-like
protuberances characterized by the property that when the first and
second separable fastener members are pressed into face-to-face
relationship the spear-like protuberances on the first separable
member penetrate the surface of the second separable member and
engage the complementary engaging elements of the second separable
member and resist separation parallel to the interfacial plane of
engagement but are readily separable due to the mechanical flexing
cooperation of said radial extensions with said stem by peeling
forces applied substantially normal to this interfacial plane in
all directions relative to the lengthwise and widthwise dimensions
of said separable fastener members.
2. Separable fastening device according to claim 1 wherein the
configuration of said spear-like protuberances further comprises a
concave recess at the unsupported endmost portion of said stem
where the sloping upper surfaces of said radial extensions of said
spear-like head join with the end of said stem, and a rounded
concave configuration on the radial extensions where the sloping
lower surfaces of said radial extensions joins with the side
surfaces of said stem, said concave recess and configurations
mechanically cooperating to facilitate resilient bending of said
radial extensions relative to said stem in a plane parallel to the
plane of said stem.
3. Separable fastening device according to claim 2 wherein said
base material is flexible to facilitate peeling said first
separable member from the second separable member.
4. Separable fastening device according to claim 3 wherein said
spear-like protuberances are more flexible than said base to
facilitate repeated resilient interengagement of said spear-like
protuberances with the complementary engaging elements of the
second separable member.
5. Separable fastening device according to claim 2 wherein said
first member comprises a molded plastic material.
6. Separable fastening device according to claim 5 wherein each
stem of said spear-like protuberances tapers from the base toward
said head.
7. Separable fastening device according to claim 6 wherein the
spear-like protuberances extend substantially perpendicular to the
base of the first separable member.
8. Separable fastening device according to claim 7 wherein the
second separable member has one surface defined by an open cell
foamed plastic in which membranes have been removed to provide at
least a partial skeletal structure of interconnected closed strands
at the surface thereof, the separable members joined in
face-to-face relationship with said spear-like protuberances on the
first separable member extending into but not through the second
separable member and a large number of spear-like protuberances
releasably engaging onto a large number of strands at or near the
surface of the second separable member.
9. Separable fastening device according to claim 8 wherein the
foamed plastic is reticulated urethane foam having a three
dimensional skeletal structure of strands.
10. Separable fastening device according to claim 7 wherein the
second separable member has a surface of complementary engaging
elements in loop form.
11. Separable fastening device according to claim 7 wherein the
tapered stem of each spear-like protuberance is defined by five
flat surfaces defining in cross-section a five sided polygon said
surfaces including:
a. a surface defining the rear portion of said protuberance,
extending from the base to the endmost portion thereof, and
substantially perpendicular to said base;
b. a surface on each side of said stem tapering from the base
toward said head and extending longitudinally along each side of
said stem and curving continuously and smoothly into and throughout
each of said radial extensions to define said rounded concave
configuration and sloping lower surfaces of said radial extensions,
said downward sloping lower surfaces further having an angled
relationship with the downward sloping upper surfaces of said
radial extensions; and
c. two flat surfaces defining the forward configuration of said
stem, said surfaces having a symmetrical relationship with said
stem and oppositely angled with respect to each other, extending
longitudinally along the forward portion of said stem and curving
continuously and smoothly throughout each of said radial extensions
defining the forward surfaces thereof, said configuration
facilitating resilient bending of said radial extensions relative
to said stem in a plane parallel to the plane of said stem.
12. Separable fastening device according to claim 11 wherein the
free end of each of said radial extensions is defined by a flat
surface which slopes toward the endmost portion of said stem and
extends from the lower sloping surface to the upper sloping surface
of said radial extensions, said configuration facilitating improved
penetration of said spear-like protuberances of said first
separable member into the complementary engaging surface of the
second separable member.
13. Separable fastening device according to claim 7 further
including a sharp pointed apex at the top unsupported end of said
stem of each protuberance, said apex facilitating improved
penetration of the spear-like protuberances of the first separable
member into the complementary engaging surface of the second
separable member.
14. Separable fastening device according to claim 13 wherein the
side surfaces defining said apex are configured to join with the
downward sloping upper surfaces of the adjacent radial extensions
of said spear-like head by a continuously curved configuration, the
configuration also including a concave recess on each side of said
apex to provide resilient bending flexibility to said radial
extensions relative to each stem to permit resilient bending in a
plane parallel to the plane of said stem.
15. Separable fastening device according to claim 14 wherein the
second separable member has one surface defined by an open cell
foamed plastic in which membranes have been removed to provide at
least a partial skeletal structure of interconnected closed strands
at the surface thereof, the separable members joined in
face-to-face relationship with said spear-like protuberances on the
first separable member extending into but not through the second
separable member and a large number of spear-like protuberances
releasably engaging onto a larger number of strands at or near the
surface of the second separable member.
16. Separable fastening device according to claim 15 wherein the
foamed plastic is reticulated urethane foam having a three
dimensional skeletal structure of strands.
17. Separable fastening device according to claim 14 wherein the
second separable member has a surface of complementary engaging
elements in loop form.
18. Separable fastening device according to claim 14 wherein the
free end of each of said radial extensions is defined by a flat
surface which slopes toward the endmost portion of said stem and
extends from the lower sloping surface to the upper sloping surface
of said radial extensions, and the forward portion of said pointed
apex is defined by a flat surface which slopes toward the rear of
said spear-like protuberance and extends from the base of said apex
to the tip, said configuration facilitating improved penetration of
said spear-like protuberances of the first separable member into
the complementary engaging surface of the second separable
member.
19. Separable fastening device according to claim 18 wherein the
tapered stem of each spear-like protuberance is defined by five
flat surfaces defining in cross-section a five sided polygon said
surfaces including:
a. a surface defining the rear portion of said protuberance,
extending from the base to the endmost portion thereof, and
substantially perpendicular to said base;
b. a surface on each side of said stem tapering from the base
toward said head and extending longitudinally along each side of
said stem and curving continuously and smoothly into and throughout
each of said radial extensions to define said rounded concave
configuration and sloping lower surfaces of said radial extensions,
said downward sloping lower surfaces further having an angled
relationship with the downward sloping upper surfaces of said
radial extensions; and
c. two flat surfaces defining the forward configuration of said
stem, said surfaces having a symmetrical relationship with said
stem and oppositely angled with respect to each other, extending
longitudinally along the forward portion of said stem and curving
continuously and smoothly throughout each of said radial extensions
defining the forward surfaces thereof, said configuration
facilitating resilient bending of said radial extensions relative
to said stem in a plane parallel to the plane of said stem.
20. Separable fastening device according to claim 1 wherein the
second separable member has at least one surface defined by an open
cell foamed plastic in which membranes have been removed to provide
at least a partial skeletal structure of interconnected strands at
the surface thereof such that when the separable members are joined
in face-to-face relationship the spear-like protuberances of the
first separable member extend into but not through the second
separable member and a large number of spear-like protuberances
engage onto a large number of strands at or near the surface of the
second separable member.
21. Separable fastening device according to claim 20 wherein the
foamed plastic is reticulated urethane foam having a three
dimensional skeletal structure of strands.
Description
This invention relates to a separable fastening device and more
particularly to a fastening device having complementary engaging
surfaces which are releasably interengageable and resist separation
parallel to the interfacial plane of engagement but are readily
separable by peeling forces applied substantially normal to this
plane. This invention provides an improvement in such fasteners
which includes a first member characterized by a plurality of
spear-like protuberances extending from one surface thereof and a
second member having a complementary engaging surface. The second
member may comprise an open cell foamed plastic member in which
membranes have been removed from the foam structure to provide at
least a partial skeletal structure of interconnected closed strands
at the surface of the foam member for engagement with the
spear-like protuberances upon placing the two members in
face-to-face relationship.
Separable fasteners such as those described in U.S. Pat. Nos.
2,717,437 and 3,009,235 which are marketed under the registered
trademark VELCRO brand hook and loop fasteners by Velcro
Corporation, 681 Fifth Avenue, New York, N.Y. have gained wide
acceptance because of the properties of the mating hooks and loops
which permit their attachment by merely placing a surface defined
by the hooks into face-to-face relationship with a surface defined
by the loops so that a large number of hooks engage a large number
of loops which resist separation parallel to the interfacial plane
of engagement but are readily separable by peeling forces applied
substantially normal to this interfacial plane. These fastening
devices are generally formed of a sheet of woven fabric having
raised threads of synthetic material, such as nylon, which are
napped or unnapped, to provide a pile surface defined by a
plurality of loops, and which may be thermally treated to become
semi-rigid. Certain of the loops may then be cut along one side
near their outer extremity to form hooks.
While these hooks provide excellent holding properties, we have
discovered newly configured spear-like protuberances which offer
improved engagement and holding properties especially when mated
with such reticulated foam. An earlier development mating the hooks
of the hook and loop fastener with reticulated foam permitted
limited engagement but lacked the quality of engagement realized by
the invention.
One application showing the use of said hook and loop fasteners for
attaching a gas cleaning filter to a frame is described in U.S.
Pat. No. 3,127,259 to Boylan. Other prior art generally relating to
the art of the invention includes: French Patent 1,131,934 which
provides a joinder between short perpendicular fibers on one
surface and foam on the other wherein the fibers penetrate into the
foam so that the foam will become impaled on these fibers; U.S.
Pat. No. 3,295,155 to Belsky et al. which relates to fibrous foam
mop pads retained in place by prongs which have oppositely angled
tip ends; U.S. Pat. No. 3,266,113 to Flanagan, Jr. which generally
refers to fastening devices having complementary surfaces of
articles which interengage each other to resist separation. None of
these patents disclose concepts which are in any manner related to
applicant's invention of utilizing spear-like protuberances in
combination with complementary engaging elements to form a
separable fastener. Other prior art also includes U.S. Pat. Nos.
3,226,751 to Lemelson, 3,080,688 to Politzer, 2,991,843 to Bell,
Jr., 3,005,219 to Miller, 3,094,330 to Smith, 3,302,232 to Wasiloff
et al. and 3,171,820 to Volz.
Broadly stated, the invention relates to a separable fastening
device having first and second separable members wherein the first
member has a surface of upstanding engaging elements extending from
one broad surface of its base and the second member has a surface
of complementary engaging elements extending from one broad surface
of its base which are releasably interengageable with the engaging
elements of the first separable member when the members are pressed
into face-to-face relationship. The invention particularly relates
to improvements in the first separable member wherein certain of
the upstanding engaging elements comprise flexible spear-like
protuberances, each having a stem supported at one end thereof on
the base of the first separable member. On the unsupported end of
the stem is a flexible spear-like head having at least two opposite
radial extensions which slope from the end of said stem toward the
surface of the base and extend away from said stem and are
resiliently flexible in a plane parallel to the plane of said stem.
The spear-like protuberances are characterized by the property that
when the first and second separable fastener members are pressed
into face-to-face relationship the spear-like protuberances on the
first separable member penetrate the surface of the second
separable member and engage the complementary engaging elements of
the second separable member and resist separation parallel to the
interfacial plane of engagement but are readily separable by
peeling forces applied substantially normal to this interfacial
plane.
The invention is particularly compatible with foam as the secondary
complementary member. In a preferred embodiment the second
complementary member comprises reticulated urethane foam having a
three dimensional partial skeletal structure of strands at the
surface of the foam plastic member.
In addition the invention can be used directly with end use
products such as those used as filter media in air conditioning
units and in other acoustical and hygienic filtering applications.
These uses comprise important applications of the fastening device
of the invention. By framing or partially framing the opening in
which the open cell filter media is to be placed, a filter having
the foam surface described can easily be attached in place and
removed for cleaning or replacement by simply pressing the foam
member in contact with the spear-like elements. Thus, the method of
securing members incorporating a foamed plastic surface as
described with the member having spear-like protuberances also
forms a part of this invention.
Further uses of the fastening device include attaching foam backed
carpeting to the floor, the use of foam as gasket material, the
attachment of foam protector mats or pads such as in athletic uses,
the holding of foam-type insulation in place, and the attachment of
foam sponges and the like to devices for washing cars, dishes and
the like. The fastener could also be used in fabricating foam
products of different types where the spear-like protuberances can
be used for interim holding of the foam during some treatment or
operation on the foam. In addition, the spear-like protuberances
have been found to replace the hooks in hook and loop fasteners
whereby a first member having on one surface a plurality of
spear-like protuberances of the instant invention is pressed in
face-to-face relationship with a second member having on one
surface a plurality of loop elements. The spear-like protuberances
deeply penetrate the loops of the second surface and a large number
of spear-like engaging elements engage onto a large number of loop
elements to form a fastening device of superior holding power as
contrasted to the fastening devices of the prior art.
A preferred embodiment of the invention is described with reference
to the drawings wherein:
FIG. 1 is a perspective view of an open cell foamed plastic member
partially in face-to-face relationship with a surface of spear-like
protuberances;
FIG. 2 is a perspective view of the spear-like protuberance of the
present invention;
FIG. 3 is a front elevational view of the spear-like protuberance
of FIG. 2;
FIG. 4 is a side elevational view of the spear-like protuberance of
FIG. 2;
FIG. 5 is a perspective view of an alternate embodiment of the
spear-like protuberance;
FIG. 6 is a front elevational view of the spear-like protuberance
of FIG. 5;
FIG. 7 is a side elevational view of the spear-like protuberance of
FIG. 5;
FIG. 8 is a greatly enlarged fragmentary view of the attachment of
a surface of spear-like protuberances to an open cell foamed
plastic member taken substantially along lines 8--8 of FIG. 1,
illustrating the use of both embodiments of the spear-like
protuberances of the invention; and
FIG. 9 is a greatly enlarged fragmentary view of the attachment of
a surface of spear-like protuberances to a member having a
complementary surface of loops, illustrating the use of both
embodiments of the spear-like protuberances of the invention.
In the following description of the spear-like protuberances of the
first separable member, "downward" and "lower" refer to the
direction toward the base of the separable member and "upward" and
"upper" refer to the direction toward the unsupported end of the
protuberance. "Forward" or "face" refers to the front portion of
the protuberance which is configured of variously sloped surfaces
as shown in FIGS. 2-3 and FIGS. 5-6 and "rearward" or "rear" refers
to the opposite portion behind the face portion of the
protuberance.
The spear-like protuberances of the instant invention which may be
a plastic material for example, are shown clearly in FIG. 2 and
FIG. 5. They are preferably affixed to a flexible base as for
example, plastic. The protuberances may be more flexible than the
base to facilitate resilient interengagement and disengagement with
the complementary engaging elements of the second separable
member.
The protuberance 10 shown in FIG. 2 is comprised of a stem 12,
preferably tapered as shown, having a head 14 at the unsupported
end of the stem 12. The head 14 utilizes a "double eye" structure
and is comprised of at least two "ears" or radial extensions 16
which preferably slope from the unsupported end of the stem 12
downward toward the base 32 of the first separable member. The
radial extensions 16 extend away from the stem 12 such that the
free end represented by surface 17 of each extension 16 is in
spaced relationship with the side surfaces 30 of the stem. The
configuration of the radial extensions 16 as shown in FIGS. 2-4 and
FIGS. 5-7 provide improved engaging capability of the spear-like
protuberances with the complementary engaging elements of the
second complementary surface of the fastening device.
The tapered stem 12 is preferably configured of five flat surfaces
as shown, which define in cross-section a five sided polygon. A
rear surface 11 extends perpendicularly from the base 32 to the
unsupported endmost portion of the protuberance. Two side surfaces
30 of the stem 12 which taper from the base 32 toward the head 14
extend longitudinally along each side of the stem and curve
continuously and smoothly into and throughout each radial extension
to define a rounded concave configuration 28 and continue to define
the sloping lower surfaces 26 of the radial extensions 16. The
sloping lower surfaces 26 also are preferably configured to have an
angled relationship with respect to the downward sloping upper
surfaces 22 of the radial extensions 16.
The forward portion or face of the stem 12 is defined by two
symmetrical and oppositely angled surfaces 13, which extend
longitudinally along said forward portion and define the
configuration of the face of the stem 12. The surfaces 13 curve
continuously and smoothly throughout each of said radial extensions
16 defining the forward or face surfaces 15 of each radial
extension 16.
In the preferred embodiment the free ends of the radial extensions
are configured as flat surfaces 17 which are preferably sloped
toward the stem 12 and extend from the lower surface 26 to the
upper surface 22 of the radial extensions 16. This facilitates
maximum penetration of the protuberances into the complementary
engaging surface of the second separable member.
To increase the penetrating capability and thus provide maximum
engagement of the protuberances with the complementary engaging
elements at or near the surface of the second separable member, a
sharp pointed apex 18 is preferably provided at the top of the stem
12 to define a relatively pointed structure. The sloping side
surfaces 24 of the pointed apex 18 extend downward to join the
sloping upper surfaces 22 of the radial extensions 16 at a smooth
concave recess 20. The concave recess 20 provides maximum resilient
flexibility for the radial extensions 16 of the spear-like head 14.
A flat sloping surface 19 which improves the penetrating capability
of the protuberance 10 by providing an improved sharp configuration
for penetration of the apex 18, is also provided in the preferred
configuration.
The specific configuration comprising the smooth blended contours
and the sloping surfaces described facilitates maximum resilient
and repeated engagement of the protuberances 10, which are
preferably molded integrally with the base 32 of a resilient
material as for example plastic, with the complementary engaging
elements of the opposite surface of the fastening device. An
example of such molding is described in U.S. Pat. application of
Menzin et al., Ser. No. 824,597 which is assigned to the same
assignee as the present application.
This repeated engagement is due to the resilient bending of the
radial extensions 16 in a plane parallel to the plane of the stems
12 due to this configuration. The flexible characteristics of the
protuberances 10 in combination with the unique configuration
thereof shown and described in the preferred embodiment, provide
superior engaging capabilities with loop elements 50 shown in FIG.
9 or the foamed plastic structure 52 shown in FIG. 1 and FIG.
8.
FIGS. 5-7 illustrate an alternate embodiment of the spear-like
protuberance heretofore described with the exception of the apex 18
provided at the top of the protuberance shown in FIGS. 2-4. The
spear-like protuberance shown in FIG. 7 includes a concave recess
36 at the top of the stem 34 where the upper surfaces 38 of the
radial extensions 40 join to form a smooth concave surface which
provides maximum resilient flexibility for the radial extensions 40
of the spear-like head 42. The flexible characteristics of the
protuberance 44 shown in FIGS. 5-7, which is preferably of plastic
material molded integrally with the base 46, in combination with
the concave junctions 48 and the concave recess 36, provide
resilient flexibility which facilitates maximum repeated engagement
and maximum holding power of the protuberances with the
complementary engaging surface of the opposite engaging member of
the fastening device.
An application of the fastening device of the invention (not shown)
utilizes a tape which frames the air passageway of an air
conditioning unit. The tape comprises a base member having
upstanding spear-like protuberances as in the manner disclosed
herein. The base member can be coated on its back with a
pressure-sensitive adhesive to facilitate attachment of the tape
member to the cabinet of the air conditioning unit. A foamed
plastic sheet which is to be used as the filter in the air
conditioning unit is, in this embodiment, a sheet of controlled
pore reticulated foam consisting of low density urethanes and is
characterized by a three-dimensional skeletal structure of strands
which can provide 97 percent or more of void space since it is
substantially devoid of membranes; foam of this type is described
in U.S. Pat. No. 3,171,820 to Volz. By merely pressing the foam
surface in contact with the surface of the tape member defined by
the spear-like protuberances, a large number of radial extensions
of the protuberances will attach to the interconnected strands of
the foam and upon release of the pressure required to interconnect
the engaging elements the foam will return to its former shape and
retain its high degree of permeability. Reticulated foams of this
type are relatively strong, have good fatigue resistance and tear
abrasion, and thus when engaged will resist separation parallel to
the interfacial plane of engagement but are readily separable from
the tape member by peeling forces applied substantially normal to
this interfacial plane. Once the foamed plastic filter has been
attached in this manner it may be retained in position to function
as an effective filter medium in the air conditioning unit.
Although reticulated foams are preferred since they present the
maximum number of strands at the surface of the foam sheet for
engagement by the hooks, other open cell foams which might have a
small percentage of membranes still intact but present a sufficient
number of interconnected strands at the surface for engagement with
the spear-like protuberances can also be used in the fastening
device of the invention.
While an application of the invention has been described in
relation to an open cell foam which may be used as a filter media
the open cell foam could itself be in the form of a tape member or
could be laminated to other foams in open cell or any other member
for specific fastening requirements.
* * * * *