# US 2013/0154307 A1 · Impact absorbing member and method of manufacturing the same

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- Number: US 2013/0154307 A1
- Document ID: US20130154307A1
- Status: Published application
- Kind: A1
- Application number: 13/693,622
- Filed: 2012-12-04
- Published: 2013-06-20
- Earliest claimed: 2010-05-28
- Assignees: Kyoraku Co., Ltd.
- Inventors: Teruo TAMADA; Seiji OONO
- Web page: https://patentgrep.com/patent/US20130154307A1

## CPC

- B60R 19/34: destroyed upon impact, e.g. one-shot type
- B32B 3/12: characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
- B32B 3/266: {characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12}
- B32B 27/08: of synthetic resin
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B60R 21/04: Padded linings for the vehicle interior {; Energy absorbing structures associated with padded or non-padded linings}
- B32B 2250/24: All layers being polymeric
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/558: Impact strength, toughness
- B32B 2605/00: Vehicles
- B60R 21/0428: {associated with the side doors or panels, e.g. displaced towards the occupants in case of a side collision}
- B60R 2021/0414: {using energy absorbing ribs}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

An impact absorbing member includes a hollow body having a plurality of ribs, and the hollow body includes a low rib density portion being a portion where density of the ribs is low, and a high rib density portion being a portion where density of the ribs is high. The hollow body may include a thin portion and a thick portion. In this case, the rib density of the thin portion and the rib density of the thick portion may be different from each other

## Claims

### Claim 1

An impact absorbing member comprising a hollow body having a plurality of ribs, wherein the hollow body includes a low rib density portion being a portion where density of the ribs is low and a high rib density portion being a portion where density of the ribs is high.

### Claim 2 (depends on 1)

The impact absorbing member according to claim 1, wherein the hollow body includes a thin portion and a thick portion.

### Claim 3 (depends on 2)

The impact absorbing member according to claim 2, wherein the rib density of the thin portion and the rib density of the thick portion are different from each other.

### Claim 4 (depends on 2)

The impact absorbing member according to claim 2, wherein a thickness “c” of the thin portion and a thickness “d” of the thick portion satisfy 1.3c≦d.

### Claim 5 (depends on 1)

The impact absorbing member according to claim 1, wherein an average pitch interval “b” of the ribs in the low rib density portion and an average pitch interval “a” of the ribs in the high rib density portion satisfy 1.2a≦b.

### Claim 6 (depends on 1)

A method of manufacturing the impact absorbing member according to claim 1, comprising:
disposing parison between a pair of split mold blocks each having a rib forming cavity;
clamping the mold blocks;
fitting the parison along the cavities of the mold blocks by introducing pressurized air; and
cooling the parison.

### Claim 7

An impact absorbing member comprising:
a hollow body having a plurality of ribs; and
a plate member on an impact absorbing surface of the hollow body, the plate member covering at least two or more ribs.

### Claim 8 (depends on 7)

The impact absorbing member according to claim 7, wherein stiffness of a material of the plate member is higher than stiffness of a material of the hollow body.

### Claim 9 (depends on 7)

The impact absorbing member according to claim 7, wherein the hollow body includes a thin portion and a thick portion.

### Claim 10 (depends on 7)

The impact absorbing member according to claim 7, wherein the hollow body includes a low rib density portion being a portion where density of the ribs is low and a high rib density portion being a portion where density of the ribs is high.

### Claim 11 (depends on 7)

The impact absorbing member according to claim 7, wherein the plate member is a single plate covering substantially an entire surface of the impact absorbing surface of the hollow body.

### Claim 12 (depends on 10)

The impact absorbing member according to claim 10, wherein stiffness of the plate member is partially different.

### Claim 13 (depends on 7)

A method of manufacturing the impact absorbing member according to claim 7, comprising:
placing the plate member on a cavity surface of one of a pair of split mold blocks;
disposing parison between the one split mold block and the other split mold block having a rib forming cavity;
clamping the split mold blocks; and
fitting the parison along the cavity surface by introducing pressurized air.

### Claim 14 (depends on 13)

The method of manufacturing the impact absorbing member according to claim 13, wherein a thickness of the plate member is partially different.