U.S. patent number 3,813,729 [Application Number 05/320,942] was granted by the patent office on 1974-06-04 for rigid substantially u-shaped handle with closed-cell foam handgrip.
Invention is credited to George W. Bush, Marton Szabo.
United States Patent |
3,813,729 |
Szabo , et al. |
June 4, 1974 |
RIGID SUBSTANTIALLY U-SHAPED HANDLE WITH CLOSED-CELL FOAM
HANDGRIP
Abstract
A soft-feel handle for attachment to an appliance, luggage,
carrying case and the like comprised of a solid, rigid,
substantially U-shaped member having arms joined by a web or core,
a softer resilient material preferably closed-cell foam coextensive
with the web, and non-mechanical means securing the softer
resilient material to or around the web so that there is no
relative movement between the softer resilient material and the
rigid material and a method of making the handle.
Inventors: |
Szabo; Marton (Camden, NJ),
Bush; George W. (Haddonfield, NJ) |
Family
ID: |
23248516 |
Appl.
No.: |
05/320,942 |
Filed: |
January 4, 1973 |
Current U.S.
Class: |
16/408; 74/551.9;
473/203; 16/DIG.12; 16/114.1; 16/430; 16/902 |
Current CPC
Class: |
A45C
13/26 (20130101); Y10S 16/12 (20130101); Y10S
16/902 (20130101); Y10T 74/20828 (20150115); Y10T
16/455 (20150115); Y10T 16/4567 (20150115); Y10T
16/476 (20150115) |
Current International
Class: |
A45C
13/00 (20060101); A45C 13/26 (20060101); A45c
013/26 () |
Field of
Search: |
;16/116R,116A,126,DIG.12,119,115 ;190/57,58R,58A,58B ;264/273 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gay; Bobby R.
Assistant Examiner: Dorner; Kenneth J.
Attorney, Agent or Firm: Millman; Max R.
Claims
What is claimed is:
1. A soft-feel handle for hinged attachment to an appliance,
carrying case and the like consisting essentially of a solid rigid
substantially U-shaped member made of a thermoplastic resin and
having arms joined by a web, said web being generally H-shaped in
cross-section and thereby including a longitudinal central core and
circumferentially spaced longitudinal grooves extending from said
core, a resilient handgrip member substantially coextensive with
said web embracing the same and filling in said web grooves, said
resilient handgrip member being made of a closed-cell foam of the
same type of resin as the rigid member forming its own skin and
being fused to said rigid member.
2. The handle of claim 1 and longitudinally spaced transverse
apertures in said core of said web through which portions of said
resilient handgrip extend.
3. A soft-feel handle for hinged attachment to an appliance,
carrying case and the like consisting essentially of a solid rigid
substantially U-shaped member made of a thermoplastic resin and
having arms joined by a web, said web including a longitudinal
central core and circumferentially spaced longitudinal grooves
extending from said core, a resilient handgrip member substantially
coextensive with said web embracing the same and filling in said
web grooves, said resilient handgrip member being made of a
closed-cell foam of the same type of resin as the rigid member
forming its own skin and being fused to said rigid member, and
longitudinally spaced transverse apertures in said core of said web
through which portions of said resilient handgrip member extend.
Description
This invention relates to a substantially U-shaped handle of the
type having a palm-engaging or handgrip portion and depending arms
adapted for hinged attached to the wall of a portable radio,
television set, electronic instrument, luggage, carrying cases and
the like.
The primary object of the invention is to provide such a handle in
which the handle is made of a rigid material but the handgrip which
is resilient and softer than said rigid material and preferably
made of a closed-cell foam with non-mechanical means non-rotatably
securing the foam handgrip to the handle.
Another object of the invention is to provide a combined rigid and
foam handle in which the foam handgrip portion is economically and
accurately molded to the desired contour and simultaneously
anchored to the handle for non-rotational mounting thereto.
Another object of the invention is to provide an attractive
soft-feel handle of the character described and a method of making
the same economically, accurately and effectively by injection
molding techniques.
These and other objects of the invention will become more apparent
as the description proceeds in conjunction with the accompanying
drawing wherein:
FIG. 1 is a side elevational view of one form of the invention;
FIG. 2 is a top plan view thereof;
FIG. 3 is an end elevational view thereof;
FIG. 4 is a section view taken on the line 4--4 of FIG. 1;
FIG. 5 is a view similar to FIG. 4 of a modified form of the
invention;
FIG. 6 is a view similar to FIG. 4 of yet another modification;
FIG. 7 is a view similar to FIG. 4 of yet another modification;
FIG. 8 is a view similar to FIG. 4 of still another
modification;
FIG. 9 is a side elevational view of another form of the
invention;
FIG. 10 is a perspective view of the handle without the foam grip;
and
FIG. 11 is a sectional view taken on the line 11--11 of FIG. 9.
Specific reference will now be made to the drawings in which
similar reference characters are used for corresponding elements
throughout.
The handle shown in FIGS. 1-8 essentially comprises a substantially
U-shaped solid rigid member 10 and a central softer resilient
portion 12 serving as the handgrip.
The member 10 comprises spaced arms 14 with through apertures 16
adjacent its free ends for hinged attachment to the wall of a
portable radio, television set, electronic instrument, luggage or
other carrying case. The arms 14 are joined by a web 18 of
preferably reduced diameter and of shape and construction to be
described hereinafter.
The member 10 is a one-piece member made of a rigid material having
a tensile strength of at least 3,000 psi and preferably injection
molded of such thermoplastic resins as polypropylene, high density
polyethylene, rigid vinyl, polystyrene,
acrylonitrile-butadiene-styrene copolymers (known as ABS), and the
like; or thermosets made by transfer or compression molding.
The web or core 18 can take the forms illustrated in FIGS. 4-9, the
function of which is to permit attachment of the foam handgrip 12
thereto in such a manner that there is no relative rotation between
the handgrip 12 and the web or core 18. Thus, the member 10 can be
molded or formed with a web 18 having longitudinal, vertically
opposed diametrical slots or grooves 22, in which case the web or
core 18 is substantially vertically H-shaped in cross-section as at
24 or longitudinal, horizontally opposed diametrical slots or
grooves 26 in which case the web or core 18 is substantially
horizontally H-shaped in cross-section as at 28. It should here be
understood that other core shapes can be employed to provide
circumferentially spaced longitudinal slots or grooves.
In the form of invention shown in FIG. 6, the web of the rigid
member 10 is substantially triangular in cross-section as at 30. In
the form shown in FIG. 7, the web of the rigid member is
substantially rectangular as at 32 and is provided with spaced
transverse through apertures 34 for a purpose soon to appear. In
the form shown in FIG. 8, the web 36 can take the same H-shape as
that shown in FIG. 4 or FIG. 5 but the narrower core of the same
may be additionally provided with longitudinally spaced through
apertures 38.
The handgrip 12 is a resilient member which is softer than the
rigid member and is preferably made of a closed-cell thermoplastic
resin, having a preferred density of 4-12 lbs./cu. ft., and made of
such resins as polyurethane, polyvinylchloride, polyolefines,
copolymers of ethylene-vinyl acetate, and the like. It may also be
made of a non-foam thermoplastic resin with a low Shore "A"
Durometer such as up to 50.
In the process of forming the handle, the rigid member 10 is first
formed by injection molding or any other economical molding
process. The member 10 is then positioned as an insert centrally in
the cavity of a second mold designed to conform to the contour of
the desired handgrip. The foam resin formulation is then fed
through an injection molding into the cavity of the second mold.
The resin begins to foam in the heating cylinder of the injection
molding machine and completes its foaming and fills out the cavity
around the web or core 18 of the rigid member 10 to complete the
formation of the handle which may be ejected or otherwise removed
from the mold.
As seen in FIGS. 4 and 5 the foam handgrip, because it is
closed-cell or unicellular, forms its own skin and fills in the
slots or grooves 22 and 26 as well as surrounds the web to the
outer contour of the handgrip, which may be circular or of any
other shape. Although the outer diameter 40 of the foam handgrip
exceeds the average diameter of the portions 42 of the rigid member
10, the thickness of the foam handgrip may vary and may even be
level with the outer surface of the rigid member 10, in which case,
to get good cushioning of the palm and fingers gripping the same,
the core or web 18 would have to be narrowed still further, which
is not as desirable as having the foam handgrip bulge out somewhat,
as shown in the drawings.
Because the foam fills in the slots 22 and 26, relative rotation
between the grip 12 and the web 18 of the rigid member is
eliminated or at the very least almost completely restrained.
Similarly, when the cross-section of the web 18 takes a
non-circular form such as the triangle 30 in FIG. 6, relative
rotation of the foam grip around the core or web is also
substantially eliminated.
To insure that the foam grip is non-rotationally mounted on the
core or web of the rigid member, transversely spaced through bores
or apertures 34 or 38 can be provided in the web or core which are
filled in with the foam material when it fills the cavity of the
second mold in which the rigid member 14 is a central insert.
The outer surface of the handgrip may be smooth, textured or
otherwise decorated with, for example, spiral grooves 43 for
esthetic effect and the same may be colored the same or different
from the rigid member 14.
While it is preferred that the foam resin of the handgrip be
different from the resin of the rigid member 14, in which case
there is no fusion between the handgrip and the web 18 which it
surrounds, it is possible to make the rigid and foam material of
the same resin, in which case fusion between the members will take
place at the handgrip portion.
The principles of the application are applicable to all forms of
handles which have a grip portion and ends destined for attachment
to various appliances and carrying cases. In FIGS. 9-11 is
illustrated another such form whose general construction is shown
in U.S. Pat. No. 3,531,822.
Referring first to FIG. 10, a rigid substantially U-shaped member
44 is provided having arms 46 joined by a palm-engaging web 48 the
arms terminating in outwardly-rounded bosses 50 with through holes
or bores 52 for hingedly attaching the same to an appliance,
carrying case and the like.
Substantially L-shaped fairly deep recesses 54 are provided on
opposite sides of the lower edges of the web portion 48 which are
contiguous to and continuous with recesses 56 of the same depth on
the opposite inner sides of the arms 46. These continuous grooves,
in effect, form a ledge 57. Spaced along the length of the entire
handle from one boss 50 to the other are transverse through
apertures 58 located preferably at least at the junctures of the
arms 46 with the web 48 and extending through the narrower ledge
57.
As with the previously described handles of FIGS. 1-8 the rigid
member 44 may be made of the same resins as those used to injection
mold member 10. In the cavity of a second mold, the rigid member 44
is positioned to one side therein and the same foam material as
described hereinbefore with relation to grip 12 is injection molded
into the cavity of the second mold. A resilient foam member 60 is
formed whose peripheral edge 62 overlies the outer edge of the
recesses 54 and 56 and covers them, portions of the foam extending
into and through the apertures 58 to thereby anchor the foam on the
rigid member and minimize if not eliminate movement of the
finger-engaging foam material relative to the rigid member.
While preferred embodiments of the inventions have here been shown
and described, it will be understood that skilled artisans may make
variations without departing from the spirit of the invention.
Thus, the rigid U-shaped members 10 and 44 may also be made of cast
metal, such as aluminum. Also, by the term "non-mechanical" means
used herein to secure the foam grip to the rigid member is meant,
so to speak, self-anchoring means as distinguished from special
clamps, bolts or equivalent devices which would reduce the
compressibility of the foam member.
It should further be understood that shapes for the webs of the
rigid U-shaped member other than those shown can be used provided
that the relative movement between the foam handgrip and the web is
minimized or eliminated. Thus, for additional security,
longitudinally spaced apertures can be provided in the triangular
web 30 of FIG. 6 through which the foam 12 will pass. Also, the web
may be oval in cross-section and provided with longitudinally
spaced apertures through which the foam will pass. While even a web
of circular cross-section with longitudinal apertures through which
the foam passes may also be used, this is not preferred since
continued use of the handle will put stress on the portions of the
foam passing through the holes and the circular cross-section of
the web will not in itself offer resistance to the relative
rotation of the foam handgrip and the web.
* * * * *