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Патент USA US3038227

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June 12, 1962
3,038,217
E. P. HARRIS
RESILIENT SEALING STRIPS FOR SEALING DOORS
Filed Nov. 13, 19-56
3 Sheets-Sheet 1
~47
H
M
alga.
INVENTOR.
£0 WARD FHAIRR/s
BY
"
ATTORNEY
June 12, 1962
E. P. HARRIS
3,038,217
RESILIENT SEALING STRIPS FOR SEALING DOORS
Filed Nov. 15. 1956
'
3 Sheets-Sheet 2
INVEN TOR.
E0 WARD Pf/mele/s
ATTORNEY
June 12, 1962
E. P. HARRIS
3,038,217 ’
RESILIENT SEALING STRIPS FOR S-EALING DOORS
Filed Nov. 15, 1956
5 Sheets-Sheet 5
1310
56
INVENTOR.
EDWARD P?/l/Pla/s
BY
.
AM
ATTORNEY
Uited States Patent O?lice
3,638,217
Patented June 12, 1962
l
2
3,038,217
FIGURE 5 is a cross sectional view taken along line
5—5 of FIGURE 3.
RESILENT SEALING STRIPS FUR
SEALING DGORS
FIGURE 6 is another form of apparatus for ?lling
Edward I’. Harris, Dayton, Ohio, assignor to General
Motors Corporation, Detroit, Mich, a corporation of
Delaware
Filed Nov. 13, I956, Ser. No. 621,838
2 Claims. (Cl. 20-69)
bulb type seals with a ?ller strip.
FIGURE 7 is a cross sectional view of a seal member
which may be ?lled with a ?ller using the apparatus of
FIGURE 6.
.
FIGURE 8 is a cross sectional view taken along lines
8——8 of FIGURE 6.
This invention relates to sealing strips suitable for seal 10 FIGURE 9 is a cross sectional view taken along line
ing doors and the like, and in particular to a method of
9——9 of FIGURE 6‘.
making sealing strips and apparatus therefor.
Among the various types of sealing strips in prevalent
#FIGURE 10 is another view of the apparatus shown
in FIGURE 6 which does not have a seal strip associated
use in connection with doors and the like are those which
therewith.
consist of an elongated ?exible rubber-like tubular mem 15
The invention will now be described in greater detail
in reference to the drawings.
ber ?lled with a low density more or less resilient, strip
material. One form of this type is designed for use in
FIGURE 1 shows a cross sectional view of an extruded
applications which involve relatively low pressure for
elongated seal strip body particularly designed to be
holding a door in sealing contact with the seal, as for
example, a door held in a closed position by magnetic
means. It includes a relatively heavy ?at base portion
?lled with a strip of compressible ?ller material in accord
ance with the present invention. It includes a relatively
heavy base portion ll) having a relatively thin walled
portion of substantial width, which is ?lled with a mildly
bulb or tubular portion 12 integrally formed therewith,
the base It} forming a wall of the bulb. The base 10
resilient, compressible strip, or batt, of ?brous material
has downwardly projecting generally L-shaped portion
and a relatively thin and highly ?exible bulb or tubular
such as Fiberglas or a low density elastomeric foam. 25 14 extending along the length of the base and forming an
The base portion of the seal provides it with a satisfac
L-shaped groove 15, which serves as a means for seal
ingly securing the base of the seal to a door frame or the
tory degree of structural rigidity and means whereby the
like in a manner well known in the art. The base 10 is
seal may be secured to a door frame or the like, while
also provided with an extension 16 projecting laterally
the highly ?exible nature of the bulb portion and the
?ller material permits it to be readily deformed and 30 beyond the outer boundary of the bulb 12. The seal
strip is further provided with a generally Z-shaped slit
thereby provide sealing contact with the door over sub
stantially the width of the seal.
'
18 splitting the base 10 excgpt for a thin web 20 and
de?ning a groove or offset 22 in the base extension 16,
Among the objects of this invention is to provide an
and a lip or tongue 24 integrally attached to the base 19
economical and efficient method of continuously stuffing
and receivable in the groove 22. It will be noted that
or ?lling the tubular or bulb portion of a sealing strip
the Z-shaped character of the slit provides a V-shaped
of the type described, with a continuous strip of com
recess 26 which receives a V-shaped projection 28, the
pressible, resilient material and apparatus for performing
apex of which is directly somewhat inwardly of the base
the process. In general, the method involves ?rst extrud
It), to properly position the seal parts in a sealed or
ing or otherwise forming a seal strip member of heat
closed relation as will be hereinafter described. The
scalable rubber-like material which includes a relatively
seal strip as shown in FIGURE 1 is preferably extruded
?at base portion of substantial thickness having a bulb
from a heat sealable synthetic resin of the vinyl type
portion integrally formed therewith, wherein the base
which permits the formation of a self-sustaining highly
portion forms a wall or" the bulb portion. Next, the base
?exible relatively thin rubber-like bulb portion 12.
portion is slit or otherwise progressively opened longi
Another form of sealing strip member which may ad
tudinally thereof and a suitable strip of filler material
vantageously be used in the present invention is shown
is fed into the opened cavity of the bulb as it is being
in cross section in FIGURE 2 in extruded form. It
opened. Finally, the slitted edges are rejoined by heat
differs from the seal strip shown in FIGURE 1 in that
sealing or other suitable means. The invention further
tongue or lip portion 24A is provided with a projecting,
involves apparatus for sequentially opening the seal base,
?lling the bulb cavity with a filler strip and heat sealing 50 preferably longitudinal, diamond-shaped wedge 30 in
tegrally attached thereto, and the offset portion 22A of
the opened base edges, in a continuous operation. In
the base extension 16A is provided with a corresponding
other embodiments, the seal strip is extruded in a form
diamond-shaped longitudinal recess 32, for receiving the
wherein the base portion of the seal is open and the
wedge 34} in interlocked relation. The base of the strip
edges of the opening or seam are provided with a positive
lock means to close the base, the seam then being pref 55 10A adjacent the tongue 24A is provided with a vertical
erably sealed.
wall 34 which serves to guide the vertical wall 36 in the
?ller ?lling operation as will be hereinafter apparent.
Further objects and advantages of the present inven
In extruded form, the walls 34 and 36 are joined by a
tion will be apparent from the following description, ref
thin web 35 to facilitate extrusion and handling of the
erence being had to the accompanying drawings wherein
preferred embodiments of the present invention are clear 60 strip.
ly shown.
In ?lling the seal strip as, for example, the strip shown
in FIGURE 1, with a compressible ?ller strip in accord
ance with the present invention, apparatus shown in
{FIGURE 1 shows an elevational cross sectional view
FIGURE 3 may be advantageously used. It includes a
of an extruded seal member.
FIGURE 2 is another form of an extruded seal 65 base plate 37 having a longitudinal seal supporting mem
ber 38 adapted to slidingly support the seal base 10. A
member.
‘
In the drawings:
~
FIGURE 3 is one form of apparatus which may be
used for continuously ?lling the seal member shown in
knife blade 39, or other suitable means, attached to base
plate 37, is provided to slit or tear the web 20 of the seal
body to open the seal body bulb as the seal body passes
FIGURE 1 with a compressible ?ller strip.
thereacross from left to right. Immediately ahead of
FIGURE 4 is a cross sectional view taken along lines 70 the knife blade 39 is a guide member 40 supported on an
4-4 of FIGURE 3.
inverted U-shaped housing member 41, diverging from
8,038,217
A
the horizontal plane of the seal extension 16 and being
operative to raise the extension 16 to permit a strip of
portion 51 and an L-shaped portion 52. This seal strip
may be ?lled with a ?ller strip utilizing the apparatus
compressible material 42 to be laid on the base 10 of
shown in FIGURES 6 and 10 wherein the strip, in an
inverted position, is moved from top to bottom in FIG~
URE 6 and from left to right to FIGURE 9.
Referring to FIGURE 10, the apparatus includes a
the seal body (as shown in FIGURE 4) through an
opening in the housing 41 guided therein by a funnel 43
supported by the housing member 41 as shown. Ahead
of the funnel 43 is a second guide member 44 operative
to depress the bulb 12 and extension 16 to its closed
position. Finally, ahead of the guide plate 44 are a
pair of horizontally disposed, vertically spaced longitu
to a high frequency source 47 operative to force the
dinal guide bars 53 and 54, supported by bracket means
55 supported by base plate 56 which also supports a
pair of spaced support members 57. At one end of the
guide bars is a knife member 58 suspended between guide
tongue 24 into offset 22 and heat seal the parts together
as shown in FIGURE 5 for reforming the bulb portion
bars 53 and 54 and preferably attached thereto at an
angle as shown in FIGURE 10 to facilitate its cutting
pair of opposed rollers 45 and 46 electrically connected
into an integrated structure. It will be noted that the
V-shaped recess 26 and the V-shaped projection 28 are
directed inwardly of the seal base 10 to permit the pres
sure of the rollers 45 and 46 to tend to force the coop
action. The apparatus is shown in FIGURE 6 having
the seal strip 48 associated therewith in a ?ller strip in
serting operation. The strip 48 is inserted over the lower
guide bar 54 in an inverted position whereby the lower
crating tongue 24 and extension 16 in a mechanically
guide bar serves as a support for the seal strip base 49
interlocked relation.
as shown more clearly in FIGURE 8. As the strip is
The rollers 45 and 46 may be of any suitable material, 20 moved downwardly in FIGURE 6, the seal strip base 49
preferably metal, and are preferably cylindrical in shape.
The rollers are preferably mounted for adjustment rela
is slit open as shown in FIGURE 7.
Ahead of the knife member 58, as indicated at 59
tive to each other. Any suitable means such as mechani
(FIGURE 10), the guide members 53 and 54 are joined in
cal or hydraulic pressure, etc., may be utilized. The
a unitary section thereof which has an opening 60 there
rollers 45 and 46 are shown connected as electrodes in 25 through shown by dotted lines, having a tube 61 secured
the output circuit of an oscillator contained in the high
frequency unit 47, in such a fashion that oscillating high
therein for feeding a ?ller strip 63 into the seal cavity.
The unitary section 59 is externally formed to have a
frequency waves generated in the oscillator coils will
wedge-like guide portion 62 operative to spread apart the
alternate between the rollers so as to pass through the
slit edges of the seal strip as it passes thcreacross and an
portions 16 and 24 of the seal body which are pressed
together between the rollers to heat seal these portions
together as is well known in the art. In place of the
roller means 45 and 46, equivalent induction heat sealing
opposed wedge-like guide portion 64 permitting the slit
edges of the seal strip to be brought together a su?icient
amount to enable the heating element 66 supported by
bracket member 68 attached to the support member 57, to
means may be utilized as is well known in the art as, for
soften the slit edges of the strip as shown in FIGURE 9.
example, a pair of opposed endless metal belts or bar
To this end, the terminals 67 are connected to a suitable
source of electrical energy to cause the element 66 to be
sealing apparatus.
a
The above described apparatus may be used to ?ll the
heated to an adequate degree. After the edges of the
strip ‘are adequately softened, they are brought together
described in connection with FIGURE 1. As the seal
and fused on cooling. The bringing together of the strip
strip is passed through the apparatus shown in FIGURE 40 edges is effected by an external guide member 70 as
1, the knife 39 slits the joining web portion 35 and the
shown in FIGURE 6 which is supported for longitudinal
bulb portion together with the extension 16A is raised,
adjustment between the support members 57. The guide
?lled and closed as described in connection with the strip
member 70 is slidably supported between the support
of FIGURE 1. Finally, as the strip portions 16A and
members 57 preferably by means of inwardly directed pro
24A are passed between rollers 45 and 46, the diamond
jections 72 which are received in corresponding grooves
shaped wedge 30 is forced into the complementary recess
disposed on the side walls of the guide member 70. As
32 to mechanically lock the parts together as is indicated
may be seen in reference to FIGURE 10, the guide mem
by the dotted lines. The vertical walls 34 and 36 of the
ber 70 is provided with a longitudinal opening 72 there
seal base maintain the base 10A and extension 16A in
through having a lower portion 74 which receives the seal
vertical alignment so that as these parts are pressed
bulb ‘and an upper portion having walls 76 diverging in a
together between the rollers 45 and 46, the wedge 30
vertical plane against which the side portions of the base
readily enters the groove 32. The parts are then heat
of the seal are brought to bear. The mouth of the open
sealed as before to provide a permanently sealed joint.
ing 72 is of a greater dimension than the normal dimen
Alternatively, the heat sealing step may be eliminated
sion of the seal and the side walls of the opening gradually
and means may be provided to coat the surfaces of the
converge toward the opposite end of the guide member to
wedge 30 and/or the recess 32 with a suitable solvent
the ?nal dimension of the seal strip. To effect the sealing
such as tetrahydrofuran in the case of vinyl seal strips to
of the seal strip base, the guide member 70 is moved to re
cause the parts to fuse together after being pressed to
ceive the guide bars 53 and 54 into a position shown in
gether by non-energized rollers 45 and 46. Providing
FIGURE 6, so that the mouth of the opening 72 is in
interlocking means as described above made possible the 60 close proximity to the heating element 66 whereby the
use of any suitable elastomeric material such as natural
heated seal edges are brought together by the guide mem
and synthetic rubbers for use as the strip material to
ber 70 as soon as they are adequately softened. In both
gether with suitable solvents and cements.
the apparatus shown in FIGURES 3 and 6, the seal strip
Another form of the invention is illustrated in FIG
is pulled through the apparatus by suitable means and
URES 6-10 wherein the seal strip body is slit longitu 65 is conveyed to and away from the apparatus by suitable
dinally and more or less centrally thereof, and after the
conveyor means. Such means may suitably be a pair of
?ller strip is inserted in place, the base portion is reunited
opposed pressure rollers, engaging therebetween the ver
by heating the slit edges by means of an electrical heating
tical portion of the L-shaped portion of, for example, the
element and bringing the edges together in a softened
strip shown in FIGURE 1, whereby the ?lled seal strip
condition by suitable guides and permitting them to fuse 70 is not distorted in the pulling thereof through the appara
together.
tus. The ?ller strip 42 of FIGURE 3 and 63 of FIGURE
In this form of the invention, a seal strip body mem
6 is preferably held within the seal strip body by friction
ber 48, shown in FIGURE 7 in cross section, is extruded
after being laid therein and as the seal body is pulled
having a base portion 49 preferably weakened along a
through the apparatus, the seal strip ?ller is pulled into
longitudinal plane 50 centrally thereof and having a bulb 75 place in an obvious manner.
seal shown in FIGURE 2. in a manner similar to that
5
The seal strips contemplated in the present invention are
preferably of the heat scalable vinyl types capable of form
ing, preferably by extrusion, a thin highly ?exible bulb
portion. An example of a suitable material may include
6
tion integrally attached to the sides of said base portion
and ?ller material disposed within the bulb portion, the
steps comprising, longitudinally slitting the base of said
bulb for providing an opening in the base of the seal body
42.46% polyvinyl chloride, 16.89% precipitated calcium
longitudinally thereof, progressively laying ?ller material
carbonate as a ?ller, 1.28% barium-cadmium laurate as a
within the cavity of said bulb through said opening, then
bringing the edges of the slit portion at the base of the
bulb portion into contacting position and sequentially and
progressively heat sealing said edges of the slit portion
for reforming said bulb portion and for con?ning perma
nently the ?ller material within said bulb portion.
2. A resilient sealing strip, comprising, an elongated
heat and light stabilizer, 0.22% stearic acid as a lubricant,
36.94% polyester type plasticizer and 2.12% epoxy resin
type plasticizer. The speci?c material involved in the
present invention forms no part of the present invention,
the above example being intended merely to show the type
of material which may be used.
The ?ller strip material 42 of FIGURE 3 or 63 of
relatively ?at base portion of a substantial thickness, a
FIGURE 6 may be any mildly resilient material having a
relatively thin walled bulb portion integrally connected
capacity to sustain itself in strip form whereby it may be 15 longitudinally along one side thereof to said base portion
fed into the apparatus by a movement of the seal strip
and extending throughout the entire length of said base
body. Examples of suitable materials include Fiberglas
portion, said bulb portion being normally longitudinally
or rock Wool batt in strip form reinforced by a strip of
free from said base portion at the other side thereof, an
fabric adhesively attached to the base thereof, or by a
interlock extending longitudinally along the entire extent
layer of suitable adhesive applied to the base thereof and 20 of said strip and having inter?tting portions carried by
cured. The ?ller strip may also be a low density elas
said free side of said bulb portion and by the adjacent part
tomeric foam or a semi-rigid or flexible low density type
of said. base portion, said interlock being adapted to in
foam. The invention also contemplates feeding a foam
terlock the free side of the bulb portion in ?xed relation
able polyisocyanate type mixture of the type disclosed in
to the base portion, resilient ?ller material within said
the US. Patent 2,764,565 by means of apparatus of the 25 bulb portion, and a longitudinally extending heat seal ex
type disclosed therein. In this case, the tube 61 of FIG
tending the full extent of said interlock.
URE 6 and funnel 43 are suitably modi?ed to include
References Cited in the ?le of this patent
suitable nozzle means operative to deposit a stream or
ribbon of foamable material in predetermined quantities in
UNITED STATES PATENTS
the seal cavity which will foam in situ to provide a ?ller 30
sealing strip comprising, a body portion made of heat
scalable material, including a relatively ?at base portion
2,732,880
2,739,089
2,774,620
1929
1934
1938
1940
1,945
1949
'1952
1952
1954
1954
1955
Hawk _______________ __ Jan. 31, 1956
Hageltorn ___________ __ Mar. 20‘, 1956
Beare ________________ __ Dec. 18, 1956
of substantial tln'ckness, a relatively thin ?exible bulb por
2,786,241
Garvey et 'al. ______ __'__ Mar. 26, 1957
preferably substantially ?lling the cavity. For this pur
4,741,443
v1,972,788
pose, the embodiment shown in FIGURE 3 is preferred
2,129,607
since it involves depositing the tfoarnable material on the
2,195,046
base of the seal ‘body which results in a better distribution
2,388,297
of ?ller within the seal cavity after the filler material has 35 2,492,566
foamed.
2,582,022
While the embodiments of the present invention as
2,589,766
herein disclosed constitute preferred forms, it is to be
2,672,177
understood that other forms might be adopted.
‘2,680,888
40
What is claimed is as follows:
1. In a method of making an elongated elastorneric
2,700,197
Slade _______________ __ Dec. 31,
Miller _______________ __ Sept. 4,
Schott ________________ __ Sept. 6,
Best ________________ __ Mar. 26,
Slaughter _____________ __ Nov. 6,
Geyer _______________ __ Dec. 27,
Feldrnan et al __________ __ J an. 8,
Bradley _____________ __ Mar. 18,
Werneskog __________ __ Mar. 16,
Jarrow _______________ __ June 15,
Kesling _______________ __ Jan. 25,
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