Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-11-27
1998-05-05
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1562751, 1563084, 1563806, 5708, B32B 3120, F04B 3300, F04B 4500
Patent
active
057468737
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for producing an air mattress with one part, which acts as a pump and one part, which is to be inflated by the pump.
An air mattress with these features is known, for example, from WO 94/03089. In the known air mattress, air can enter the interior of the pump part through the inlet opening by opening up said opening. When air is admitted, the propellant material accommodated in the pump part increases in volume until the pump part is to some extent filled with air. Now the pump part is compressed, for example, by the foot of the user, so that the foot closes the inlet opening. Now air passes into the inflatable part through the one-way outlet valve. This pumping process is repeated until the inflatable part is inflated somewhat more than is ultimately desired. If the pumping action is then stopped and the inlet opening closed, some of the air flows back into the pump part through the small opening, until the same pressure prevails in the closed system formed by the pump part and by the inflatable section. With that, the mattress is ready for use. To empty the air mattress, the outlet opening is opened. By rolling up the air mattress starting from the pump part, the air is removed from both the pump part as well as from the inflatable part, in that it emerges through the outlet opening. The propellant material is understood to be a compressible material, which increases in volume upon the admission of air. An open-celled synthetic foam material, for example, is such a material.
The aforementioned publication does not disclose the method of making the mattress and specifically not the method of welding-in the wall separating the pump part from the part to be inflated.
It is therefore an object of the invention to enable the mattress to be produced and, in particular, to enable the pump part wall to be welded in place in an especially economical manner.
SUMMARY OF THE INVENTION
By inserting a metallic tool between the plates of the high frequency welding machine, it is ensured that a current flows over this tool and causes the thermoplastic films, inserted between a plate and the tool, to be heated and, hence, welded. After the welding of the pump part wall, the tool is removed and only subsequently are the edges of the covering skin bonded together.
Above all, it is important in this connection that, when the pump part is disposed inside the air mattress, a film, which is frame-like in plan view, and a tool, which is also frame-like, are used. In this case, the tool must be dividable, as it could otherwise not be removed.
A tool, which is not dividable, may be used when the pump part is disposed in a corner of the air mattress.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in greater detail in the following by means of the embodiments shown in the drawing, in which
FIG. 1 shows a cross section through the pump part during the welding-in process,
FIG. 2 shows a section through the pump part, perpendicular to FIG. 1,
FIG. 3 shows a perspective view of an air mattress, which is partially cut open, with a pump part lying inside the mattress,
FIG. 4 shows a perspective view of the pump part wall, which is to be welded between the covering skins,
FIG. 5 shows a perspective view of a block of the propellant material, which is to be inserted into the pump part,
FIG. 6 shows a perspective view of the tool used,
FIG. 7 shows a perspective view of the operational part formed by the elements shown in FIGS. 4 and 6,
FIG. 8 shows a plan view of a mattress, which is partially cut open, with a pump part disposed in a corner of the mattress,
FIG. 9 shows a side view of the object of FIG. 8,
FIG. 10 shows a perspective view of a block of the propellant material to be inserted into the pump part,
FIG. 11 shows a perspective view showing the position of the pump part wall prior to the welding process,
FIG. 12 shows a plan view of the pump part wall of FIG. 11 and
FIG. 13 shows a perspective view of the pump part wall with the tool, which is to b
REFERENCES:
patent: 4574026 (1986-03-01), Winther
patent: 5244526 (1993-09-01), Johenning
Ball Michael W.
Tolin Michael A.
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