# US 7,077,439 B2 · Vehicle bumper and method of making same

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- Number: US 7,077,439 B2
- Document ID: US7077439B2
- Status: Granted
- Kind: B2
- Application number: 10/647,698
- Filed: 2003-08-25
- Published: 2005-03-03
- Granted: 2006-07-18
- Earliest claimed: 2003-08-25
- Assignees: General Motors Corporation
- Inventors: Tommy E. White; Adrian B. Chernoff
- Web page: https://patentgrep.com/patent/US7077439B2

## CPC

- B21D 26/055: Blanks having super-plastic properties
- B60R 19/18: {characterised by the cross-section;} Means within the bumper to absorb impact
- B60R 2019/1813: {made of metal}
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A vehicle bumper is formed using fluid pressure such that the bumper is characterized by a curvature. The bumper preferably includes an upper bumper bar portion and a lower bumper bar portion that are interconnected. The bumper is also preferably connectable to a pair of upper rails and a pair of lower rails so that an impact load is distributable between the upper rails and the lower rails. The bumper preferably includes an inner panel and an outer panel. A method of forming a bumper is also provided. The method includes subjecting a metal blank to fluid pressure to form a bumper having a shape characterized by a curvature.

## Claims

### Claim 1

A vehicle comprising:
a frame including at least one structural frame member;
a body panel forming a first portion of the vehicle exterior surface; and
a metal bumper mounted with respect to said at least one structural frame member for receiving a load in the event of an impact to a portion of the vehicle periphery, the metal bumper including a one-piece inner panel and a one-piece outer panel operatively connected to the one-piece inner panel, wherein the metal bumper forms a second portion of the vehicle exterior surface;
wherein at least a portion of the bumper is characterized by a curvature;
wherein the first portion and the second portion of the vehicle exterior surface are substantially contiguous; and
wherein the inner panel and the outer panel define a cavity therebetween.

### Claim 2 (depends on 1)

The vehicle of claim 1, wherein said at least one structural frame member includes two lower rails and two upper rails, and wherein the bumper is operatively connected to the two lower rails and the two upper rails such that the load received by the bumper is at least partially distributed to the two lower rails and the two upper rails.

### Claim 3 (depends on 1)

The vehicle of claim 1, wherein the bumper includes an upper bumper bar portion, a lower bumper bar portion, and a portion interconnecting the upper bumper bar portion and the lower bumper bar portion.

### Claim 4 (depends on 3)

The vehicle of claim 3, wherein the inner panel and the outer panel each at least partially define the upper bumper bar portion, the lower bumper bar portion, and the portion interconnecting the upper bumper bar portion and the lower bumper bar portion.

### Claim 5 (depends on 1)

The vehicle of claim 1, wherein the inner panel is characterized by strengthening formations.

### Claim 6 (depends on 5)

The vehicle of claim 5, wherein the inner panel or the outer panel is formed using a process selected from the group consisting of quick plastic forming, superplastic forming and sheet hydroforming.

### Claim 7 (depends on 1)

The vehicle of claim 1, wherein the bumper includes an integral tab defining a hole.

### Claim 8

A vehicle comprising:
two upper rails and two lower rails; and
a metal bumper mounted with respect to the two upper rails and the two lower rails for recieving a load in the event of an impact to the periphery of the vehicle, the bumper having a one-piece outer panel and a one-piece inner panel operatively connected to the one-piece outer panel and at least partially corrugated;
wherein the inner panel and the outer panel are characterized by a curvature that is the result of exposure to fluid pressure.