Energy dissipating emergency evacuation slide

• US 5,967,254 A
• Filed: 01/23/1998
• Issued: 10/19/1999
• Est. Priority Date: 01/24/1997
• Status: Expired due to Term

• Current Assignee: Daimlerchrysler North America Corporation (Mercedes-Benz Group AG)
• Original Assignee: Daimlerchrysler North America Corporation (Mercedes-Benz Group AG)
• Inventors: Lutzer, Wilhelm
• Primary Examiner(s): Stodola, Daniel P.
• Assistant Examiner(s): LEV, BRUCE ALLEN
• Application Number:
  US09/012,681
• Time in Patent Office: 634 Days
• Field of Search: 182/48, 182/49, 182/70, 182/74, 193/25 B, 193/25 C, 244/137.1, 244/137.2, 244/137.3, 244/137.4, 244/DIG. 2
• US Class Current: 182/48
• CPC Class Codes: A62B 1/20 by making use of sliding-ropes, sliding-poles or chutes, e.g. hoses, pipes, sliding-grooves, sliding-sheets
• CPC Class Codes: B64D 25/14 Inflatable escape chutes

Abstract

An emergency evacuation slide has an internal energy dissipation characteristic so that the slide is especially suitable for evacuation of persons from a relatively great height. By dissipating the energy internally in the slide rather than by frictional heating of the clothing and skin of the evacuating persons, the danger of skin burns and other injuries to the persons is reduced or avoided. The slide surface of the slide is made up of a plurality of slide modules that each include an elastically elongatable segment, an interconnecting segment, and an anti-slip segment, which are respectively connected together one after another. The anti-slip segment has an upper anti-slip surface with a high coefficient of friction so that the anti-slip segment remains in static frictional contact and moves along with the evacuating person. The bottom surface of the anti-slip segment has a predefined coefficient of friction. The upstream end of the elongatable segment and the downstream end of the anti-slip segment are connected mechanically to a slide support body. As a person slides down the slide, the anti-slip segment moves downward along with the person and the downstream end thereof curls or rolls under itself, while the elongatable segment stretches elastically. Energy is dissipated by internal friction within the elastic elongatable segment and by friction of the bottom surface of the anti-slip segment curling or rolling under itself.

Claims

1. An emergency evacuation slide for a person to slide down from an upstream end of said slide at a higher elevation to a downstream end of said slide at a lower elevation,

comprising a slide support member and at least one slide module arranged on said slide support member, wherein

each said slide module comprises an elastically elongatable first web segment and a second web segment connected to a downstream end of said first web segment,

said second web segment comprises an anti-slip upper surface area and a frictional lower surface area with a defined coefficient of friction,

an upstream end of said first web segment is fixedly mechanically secured relative to said slide support member,

a downstream end of said second web segment is fixedly mechanically secured relative to said slide support member, and

a first remaining portion of said first web segment other than said upstream end of said first web segment and a second remaining portion of said second web segment other than said downstream end of said second web segment are not secured and are left loosely movable relative to said slide support member.

2. The emergency evacuation slide of claim 1, wherein said anti-slip upper surface area has a greater coefficient of friction as compared to said defined coefficient of friction of said frictional lower surface area.

3. The emergency evacuation slide of claim 1, wherein said anti-slip upper surface area has a coefficient of friction that is sufficiently high to be adapted to provide static frictional contact between said anti-slip upper surface area and a sliding person who slides down said slide so that said second web segment is caused to move together with the sliding person.

4. The emergency evacuation slide of claim 1, wherein said second web segment comprises a base layer and a frictional gripping layer arranged on said base layer, and said frictional gripping layer includes said anti-slip upper surface area.

5. The emergency evacuation slide of claim 1, wherein said second web segment comprises a sliding interconnection segment that is connected to said downstream end of said first web segment and an anti-slip segment that is connected to a downstream end of said sliding interconnection segment and that includes said downstream end of said second web segment, wherein said anti-slip segment includes said anti-slip upper surface area thereon, and wherein said sliding interconnection segment has a sliding surface with a coefficient of friction less than that of said anti-slip upper surface area.

6. The emergency evacuation slide of claim 5, wherein said sliding interconnection segment and said anti-slip segment each have a respective substantially fixed and non-elongatable size, and wherein said elastically elongatable first web segment has a defined resting length in a non-tensioned resting state and has an elastically elongated length of at least 150% of said defined resting length in a tensioned state in which said sliding interconnection segment applies a sliding tension to said elongatable first web segment.

7. The emergency evacuation slide of claim 5, comprising a plurality of said slide modules arranged on said slide support member.

8. The emergency evacuation slide of claim 7, wherein each said slide module further comprises a cover layer made of a material having a coefficient of friction sufficiently low for allowing sliding thereon, wherein said cover layer in each respective one of said slide modules covers at least said first web segment and exposes at least said anti-slip segment of said respective slide module in a non-operating resting state of said slide, and wherein said slide modules are so arranged that said anti-slip segment of said respective slide module extends at least partially over said cover layer of another one of said slide modules that is downstream adjacent said respective slide module during sliding of the person down said slide.

9. The emergency evacuation slide of claim 8, wherein said downstream end of said anti-slip segment of said respective slide module is secured to said cover layer of said another one of said slide modules, and said cover layer of said another one of said slide modules is secured to said slide support member, to provide said mechanical securing of said downstream end of said second web segment relative to said slide support member.

10. The emergency evacuation slide of claim 9, wherein said downstream end of said anti-slip segment of said respective slide module is rolled under a remaining portion of said anti-slip segment of said respective slide module such that said anti-slip upper surface area of said downstream end of said anti-slip segment of said respective slide module that is secured to said cover layer of said another one of said slide modules faces and contacts an upper surface of said cover layer of said another one of said slide modules.

11. The emergency evacuation slide of claim 1, wherein said slide support member comprises a gas-filled inflatable support tube.

12. The emergency evacuation slide of claim 11, further comprising an intermediate sheet layer arranged between said support tube and said at least one slide module.

13. The emergency evacuation slide of claim 12, wherein said downstream end of said second web segment is rolled under a remaining portion of said second web segment such that said anti-slip upper surface area of said downstream end of said second web segment faces and is secured to an upper surface of said intermediate sheet layer.

14. The emergency evacuation slide of claim 11, wherein said downstream end of said second web segment is rolled under a remaining portion of said second web segment such that said anti-slip upper surface area of said downstream end of said second web segment faces and is secured to an upper surface of said support tube.

15. The emergency evacuation slide of claim 1, comprising a plurality of said slide modules arranged on said slide support member in an arrangement selected from the group consisting of a first arrangement of said slide modules in a row, a second arrangement of said slide modules in a group, and a third arrangement of said slide modules arranged individually.

16. The emergency evacuation slide of claim 15, wherein said slide modules are arranged partially overlapping one another in a row.

17. The emergency evacuation slide of claim 1, wherein said downstream end of said second web segment is curled back underneath said second remaining portion of said second web segment.

18. The emergency evacuation slide of claim 1, wherein said anti-slip upper surface area of said second web segment has a coefficient of friction greater than 0.8, and said defined coefficient of friction of said frictional lower surface area of said second web segment is in a range from 0.05 to 0.5.

20. A method of using the emergency evacuation slide according to claim 1, to slide a person down from the upstream end of the slide to the downstream end of the slide, wherein the method comprises:

a) contacting the person on the anti-slip upper surface area as the person slides down the slide and thereby causing the second web segment to move downstream from an initial position along with the person,

b) elastically stretching the first web segment as the second web segment moves downstream,

c) releasing the person from the anti-slip upper surface area, and

d) elastically retracting the first web segment and thereby moving the second web segment upstream back into the initial position.

21. The method of claim 20, further comprising frictionally sliding the frictional lower surface area against at least one component selected from the group consisting of the frictional lower surface area and a counter-surface, and thereby dissipating energy by frictional heating as the second web segment moves downstream, and further comprising dissipating energy by frictional heating caused by internal friction within the first web segment during said stretching and said retracting of the first web segment.

22. The method of claim 21, further comprising curling the downstream end of the second web segment underneath the second remaining portion of the second web segment, such that the frictional lower surface area is caused to curl back upon itself and frictionally slide against itself as the second web segment moves downstream.

19. A combination of an aircraft having an exit door, and an emergency evacuation slide for a person to slide down from an upstream end of said slide at a higher elevation to a downstream end of said slide at a lower elevation, wherein:

said upstream end of said slide is connected to said aircraft at said exit door,

said emergency evacuation slide comprises a slide support member and at least one slide module arranged on said slide support member,

each said slide module comprises an elastically elongatable first web segment and a second web segment connected to a downstream end of said first web segment,

said second web segment comprises an anti-slip upper surface area and a frictional lower surface area with a defined coefficient of friction,

an upstream end of said first web segment is fixedly mechanically secured relative to said slide support member,

a downstream end of said second web segment is fixedly mechanically secured relative to said slide support member, and

a first remaining portion of said first web segment other than said upstream end of said first web segment and a second remaining portion of said second web segment other than said downstream end of said second web segment are not secured and are left loosely movable relative to said slide support member.

23. An emergency evacuation slide for a person to slide down from an upstream end of said slide at a higher elevation to a downstream end of said slide at a lower elevation, wherein:

said slide comprises a slide support member and at least one slide module arranged on said slide support member,

each said slide module comprises an elastically elongatable first web segment and a second web segment connected to a downstream end of said first web segment,

said second web segment comprises an anti-slip upper surface area and a frictional lower surface area with a defined coefficient of friction,

an upstream end of said first web segment is mechanically secured relative to said slide support member,

a downstream end of said second web segment is mechanically secured relative to said slide support member,

said second web segment comprises a sliding interconnection segment that is connected to said downstream end of said first web segment and an anti-slip segment that is connected to a downstream end of said sliding interconnection segment and that includes said downstream end of said second web segment,

said anti-slip segment includes said anti-slip upper surface area thereon, and

said sliding interconnection segment has a sliding surface with a coefficient of friction less than that of said anti-slip upper surface area.

24. The emergency evacuation slide of claim 23, wherein said sliding interconnection segment and said anti-slip segment each have a respective substantially fixed and non-elongatable size, and wherein said elastically elongatable first web segment has a defined resting length in a non-tensioned resting state and has an elastically elongated length of at least 150% of said defined resting length in a tensioned state in which said sliding interconnection segment applies a sliding tension to said elongatable first web segment.