Toy vehicle engine sound device
US4291877A · kind A · utility
14Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1980 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Jan 4, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63H17/34
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An engine-sound accessory for an electric toy vehicle produces a sound output which varies its characteristics in proportion to an electric input to the toy vehicle. The apparatus measures the total electric current fed to the toy vehicle to produce a sound control signal proportional thereto. When two or more vehicles are fed from a common power source, the apparatus is responsive to the sum of the electric current fed to the two or more vehicles whereby variation in the electric current fed to one or both of the vehicles produces a corresponding variation in the sound characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.