# US 5,348,445 A · Fan blade

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- Number: US 5,348,445 A
- Document ID: US5348445A
- Status: Granted
- Kind: A
- Application number: 08/162,946
- Filed: 1993-12-08
- Granted: 1994-09-20
- Earliest claimed: 1993-12-08
- Assignees: Cheng-Chi Hung
- Inventors: Chin-Tsaw Jwd
- Web page: https://patentgrep.com/patent/US5348445A

## CPC

- F04D 29/38: Blades {(for axial flow compressors F04D29/324)}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A fan blade for a ceiling fan is formed as an elongated laminated plate body which includes several layers of thin wooden plates that are bonded together. The laminated plate body has a top face which is formed with projecting strips and a bottom face which is formed with recessed strips that correspond to the projecting strips.

## Claims

### Claim 1

A fan blade for a ceiling fan, comprising an elongated laminated plate body which includes several layers of thin wooden plates that are bonded together, and which has a top face that is formed with projecting strips and a bottom face that is formed with recessed strips corresponding to said projecting strips, wherein said laminated plate body has a rear end, a front end and opposite longitudinal edges, said projecting strips extending from said rear end to said front end of said laminated plate body and including a pair of spaced elongated projections that divide said top face of said laminated plate body into an intermediate region and two side regions disposed on two sides of said intermediate region, and a zigzag projection that is formed in each of said side regions between one of said longitudinal edges of said laminated plate body and one of said elongated projections.

### Claim 2 (depends on 1)

The fan blade as claimed in claim 1, wherein said front end is curved, and said laminated plate body has a width which increases gradually from said rear end to said front end.

### Claim 3 (depends on 1)

The fan blade as claimed in claim 1, wherein said laminated plate body has a thickness of about 3 mm.