U.S. patent number RE35,453 [Application Number 08/412,701] was granted by the patent office on 1997-02-18 for spring unit assembly.
This patent grant is currently assigned to Slumberland PLC. Invention is credited to Paul Rodgers.
United States Patent |
RE35,453 |
Rodgers |
February 18, 1997 |
Spring unit assembly
Abstract
Apparatus for encapsulating spring units (38-40) is disclosed.
The apparatus comprises a device (13) for inserting a spring unit
between a pair of webs (16), a device (26) for tightening or
tensioning the webs about the spring unit, and a securing device
for securing the webs together in close proximity to the compressed
spring unit to encapsulate same. A method for encapsulating spring
units is also disclosed.
Inventors: |
Rodgers; Paul (Manchester,
GB3) |
Assignee: |
Slumberland PLC (Oldham,
GB2)
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Family
ID: |
10664804 |
Appl.
No.: |
08/412,701 |
Filed: |
March 29, 1995 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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Reissue of: |
870628 |
Apr 17, 1992 |
05303530 |
Apr 19, 1994 |
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Foreign Application Priority Data
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Oct 18, 1989 [GB] |
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8923528 |
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Current U.S.
Class: |
53/114; 53/138.5;
53/526; 53/553; 5/655.8 |
Current CPC
Class: |
A47C
27/064 (20130101); B68G 9/00 (20130101); B65B
9/02 (20130101) |
Current International
Class: |
B65B
9/00 (20060101); B65B 9/02 (20060101); B65B
009/02 (); B65B 061/24 () |
Field of
Search: |
;53/114,138.5,545,548,553,526,552 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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655328 |
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Apr 1929 |
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FR |
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2905096 |
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Jun 1980 |
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DE |
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176699 |
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Jul 1935 |
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CH |
|
Primary Examiner: Johnson; Linda
Attorney, Agent or Firm: Christensen, O'Connor, Johnson
& Kindness, PLLC
Claims
I claim:
1. Apparatus for encapsulating spring units between a pair of webs,
comprising means for moving said webs in a first longitudinal
direction through intermittent steps, an insertion device for
holding said spring unit therein and for inserting a spring unit
between said pair of webs, by linear movement in a second
transverse direction normal to said first longitudinal direction,
means for moving said insertion device through a linear path in
said second transverse direction between a withdrawn spring unit
receiving position spaced from said webs to receive a spring unit
within said insertion device and an inserted position in which said
insertion device is disposed between said webs, means for
tightening or tensioning said webs around said spring insertion
device, compression means outside of the webs for compressing said
inserted spring unit within said webs into a compressed spring
unit, means for withdrawing said insertion device from said
inserted position to said withdrawn position as said webs are
tightened around said compressed spring unit to retain said spring
unit between said webs, and securing means also movable in said
second direction for securing said webs together in close proximity
to said spring unit to encapsulate said spring unit.
2. Apparatus according to claim 1, in which said securing means
comprises a long arm sewing machine.
3. Apparatus according to claim 2, in which said means for
tightening or tensioning said webs comprises, at one side of said
long arm sewing machine, a direction reversible roller unit between
which said webs are fed, and at the other side of said long arm
sewing machine, a reciprocable puller bar.
4. Apparatus according to claim 1, in which said securing means
comprises a heat sealer.
5. Apparatus according to claim 1, in which said insertion device
comprises a channel or trough-shaped member adapted to be withdrawn
from said webs as said webs are tightening around said spring
unit.
6. Apparatus according to claim 1, in which said means for
compressing said spring unit comprises a pair of oppositely-movable
pressing plates, and pneumatic rams for controlling said pressing
plates.
Description
This application is a continuation of prior copending international
PCT Application No. PCT/GB90/01602, filed Oct. 17, 1990, the
benefit of the filing date which is hereby claimed under 35 U.S.C
.sctn.120..Iaddend.
This invention relates to apparatus for and a method of assembling
and encapsulating spring units for use in mattresses or other
upholstery units.
The term "spring unit" used herein means a plurality of spring
coils arranged spatially in file and joined together by wire. The
spring coils and joining wire may be formed separately and joined
by a length or lengths of wire.
The term "web" used herein is to be construed as meaning cloth,
fabric, laminated material or any other material used in, or
capable of being used in, the production of mattresses and other
upholstery units.
It is the aim of the present invention to provide an effective and
economically viable apparatus for and method of providing
assemblies of spring units for use in mattresses or other
upholstery units.
According to one aspect of the present invention there is provided
apparatus for encapsulating spring units as hereinbefore defined
between a pair of webs as hereinbefore defined, the apparatus
comprising an insertion device for inserting a spring unit between
the pair of webs, means for tightening or tensioning the webs about
the spring unit, compression means for compressing the spring unit,
and securing means for securing the webs together in close
proximity of the compressed spring unit to encapsulate same.
Preferably the securing means is a long arm sewing machine.
Alternatively it could be a heat sealer depending upon the
constitution of the webs.
The spring unit insertion device is preferably in channel or
trough-shaped member which is withdrawable before, or as, the webs
are tightened around the spring unit.
Preferably the web tensioning means comprises, at one side of the
long arm sewing machine, a direction-reversible roller unit between
which the webs are fed and, at the other side of the long arm
sewing machine, a reciprocable puller bar.
Any other convenient tensioning arrangement can be employed.
Preferably the spring unit compression means is a pair of
oppositely-movable pressing plates controlled by pneumatic
rams.
Also according to another aspect of the present invention there is
provided a method of encapsulating spring units between a pair of
webs, the method compressing inserting a spring until between a
pair of webs connected together along a line parallel with the
spring unit, tensioning the webs around the spring unit,
compressing the spring unit, and, while compressed, connecting the
webs together in close proximity to the compressed spring unit at
the other side of the spring unit from the first mentioned line of
connection.
An embodiment of the present invention will now be described, by
way of example, with reference to the accompanying diagrammatic
drawings in which:
FIG. 1 is a side view of a long arm sewing machine used in the
apparatus of the present invention;
FIG. 2 is an end view of the sewing machine;
FIG. 3 is a general view of the layout of the apparatus according
to the present invention and illustrating a first method step;
and
FIGS. 4 to 6 respectively illustrate the second, third and final
actions of the apparatus.
The spring unit assembling and encapsulating apparatus comprises a
long arm sewing machine 10 movable to-and-fro along a track 11, a
web conveying and tensioning system 12, a spring unit insertion
device 13, and a spring unit compression device 14.
The general layout of the apparatus is most clearly seen in FIG.
3.
The long arm sewing machine 10 comprises parallel arms 15 between
which parallel lengths of web 16 can pass the sewing machine 17
being carried laterally of the arms 15.
The sewing machine needle and bedplate are respectively indicated
at 18 and 19 respectively.
The long arm sewing machine 10 is movable to-and-fro along the
track 11 by an endless chain 20 driven by a reversible motor 21 and
gear transmission 22, the sewing machine 10 being coupled to the
endless chain 20 by a mechanical coupler 23 of any convenient form
and being provided with wheels 24 for running along the track
11.
The effective stitching line of the long arm sewing machine 10 is
indicated at 25.
The web conveying and tensioning system 12 comprises, at one side
of the long arm sewing machine 10, a pair of direction-reversible,
driven puller rollers 26, and, at the other side, a puller bar 27
releasably mounted on a carriage 28 which is movable to-and-fro as
indicated at 29 across a pull-off table 30 by a motor 31 and
suitable transmission (not shown).
The spring unit insertion device 13 is a channel or trough-shaped
member 32 insertable manually or by power means, for example a ram,
between the lengths of web 16. The channel or trough-shaped member
32 thus reciprocable to-and-fro in the direction of arrow 33.
The spring unit compression device 14 comprises a pair of
double-acting pneumatic rams 34, whereof the piston rods are
indicated at 35 and pressure plates at 36. The latter have lateral
plates 37 which ensure that only one spring unit 30-40 at a time is
within the compression device 14.
The use of a long arm sewing machine 10 permits lines of stitching
to be effected very close to the spring unit compression device 14,
for example as close to 20 mm. or thereabouts.
In use, two webs 16 are fed between the roller 26, are stitched
together at 41, and the puller bar 27 is inserted therebetween and
is then mounted on the carriage 28.
A first spring unit 38 is disposed in the channel or trough member
32 and inserted between the webs 16 at the compression unit 14
(FIG. 4), the rollers 26 being operated to tension the webs 16
around the spring unit 38, the channel or trough member 32 then
being withdrawn, the compression unit 14 operated to compress the
spring unit 38 and the long arm sewing machine 10 operated to
stitch the webs 16 together closely adjacent the compressed spring
unit 38 to encapsulate same (FIG. 5).
The compression unit 14 is then opened and the rollers 26 and the
carriage 28 to move the encapsulated spring unit 38 away from the
sewing machine 17 (FIG. 6).
A second spring unit 39 is then slid as aforesaid between the webs
16, is compressed, and is encapsulated by stitching as aforesaid,
the rollers 26 pulling the webs 16 to tighten same around the
second spring unit 39 prior to compression and encapsulation.
This action is repeated until all spring units are
encapsulated.
The end product is a series of parallel spring units 38-40
individually encapsulated under compression between the webs
16.
The ends of the webs 16 at right angles to the spring units 38-40
are closed by stitching for example, and the encapsulated spring
unit assembly can then be encased to form a mattress or other
upholstery unit.
* * * * *