Apparatus for the manufacture of a padded element, particularly a seat cushion

• US 4,979,890 A
• Filed: 02/28/1989
• Issued: 12/25/1990
• Est. Priority Date: 10/06/1986
• Status: Expired due to Term

• Current Assignee: Sicam Societa' Italiana Cuscini A Molle SPA
• Original Assignee: Sicam Societa' Italiana Cuscini A Molle SPA
• Inventors: Bracesco, Roberto
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): FALASCO, LOUIS V
• Application Number:
  US07/316,825
• Time in Patent Office: 665 Days
• Field of Search: 425/407, 425/415, 425/420, 425/423, 425/399, 425/406, 425/412, 29/91.1, 156/290, 156/581, 156/500, 156/580, 156/583.1, 156/583.4, 264/553, 264/119, 264/46.5, 264/321
• US Class Current: 425/399
• CPC Class Codes: B29C 33/048 using steam
• CPC Class Codes: B29C 51/42 Heating or cooling
• CPC Class Codes: B29C 63/025 applied by a die matching with the profile of the surface of resilient articles, e.g. cushions, seat pads
• CPC Class Codes: B29C 65/10 using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
• CPC Class Codes: B29C 65/485 Multi-component adhesives, i.e. chemically curing as a result of the mixing of said multi-components
• CPC Class Codes: B29C 65/522 by spraying, e.g. by flame spraying
• CPC Class Codes: B29C 65/7847 using vacuum to hold at least one of the parts to be joined vacuum work holders in general B25B11/005
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/301 Three-dimensional joints, i.e. the joined area being substantially non-flat B29C66/5223, B29C66/5224, B29C66/5225 take precedence
• CPC Class Codes: B29C 66/5326 said single elements being substantially flat
• CPC Class Codes: B29C 66/727 being porous, e.g. foam
• CPC Class Codes: B29C 66/8322 Joining or pressing tools reciprocating along one axis
• CPC Class Codes: B29L 2031/58 Upholstery or cushions, e.g. vehicle upholstery or interior padding mattresses, cushions B29L2031/751
• CPC Class Codes: B68G 7/05 Covering or enveloping cores of pads in plastics material using a matching die B29C63/025
• CPC Class Codes: Y10T 156/1041 Subsequent to lamination

Abstract

In the manufacture of a padded element, such as a seat cushion for motor vehicles, the cushion cover of cloth, leather, synthetic material or the like is applied to the padding usually of expanded plastics material after having been formed to the shape of the surface of the padding by means of pressing in the metal die and the simultaneous application of steam. The flow of steam reaches the cover by passing through the lower part of the die and emerging from passages provided in the wall which is in contact with the material. The steam used during the operation of pressing of the material is drawn from a reservoir of pressurised steam, whose chamber is not in direct communication with the passages and whose body is of metal and is in a thermally conducting relationship with the wall of the die.

Claims

1. An apparatus for use in the manufacture of a padded element comprising:

a die for pressure forming a cover intended to be applied to a padding into a shape complementary to a surface of the padding, said die having an upper part and a lower part with said lower part having a wall with passages intended to come into contact with the cover; and

means for supplying steam to the passages during pressing of the cover between said upper and lower parts so as to enable the cover to be formed into said shape;

wherein said means for supplying steam comprises a reservoir having a body defining a chamber for pressurized steam and duct means indirectly communicating said reservoir chamber with said passages formed in said wall of said die and wherein said body is connected to said wall by thermally conducting means to maintain said wall of said die in a heated condition to prevent condensation of steam thereon.

2. An apparatus according to claim 1, wherein said wall of said die defines an auxiliary chamber which is connected to said reservoir chamber by said duct means including a first duct provided with a shut-off valve.

3. An apparatus according to claim 2, wherein said auxiliary chamber communicates with a vacuum source through a duct in which a further shut-off valve is interposed.

4. An apparatus according to claim 1, wherein said reservoir chamber has an inlet connected to a source of pressurized steam through a duct, the upper part of the die defining an internal passage which is interposed in said duct between said source of pressurized steam and said reservoir.

5. An apparatus according to claim 1, wherein said upper wall and said body of said pressurized steam reservoir are in one piece, said reservoir having an upper wall arranged below and spaced from the upper wall of said die and wherein said reservoir chamber is an annular chamber surrounding a central duct which in turn communicates with the duct in which the shut-off valve is interposed.

6. An apparatus according to claim 2, further comprising a container for a catalyst for an adhesive which is used for gluing the padding to the cover;

a further duct connecting said container with said duct connecting said reservoir chamber to said auxiliary chamber; and

a supply pump interposed in said further duct.

7. An apparatus according to claim 6, wherein a nonreturn valve is interposed in said further duct downstream of said pump to prevent steam from flowing towards said container.