Patent · US Expired

Driver's seat

US4471934A · kind A · utility

7Cited by

5References

6Claims

0Family size

Assignee

Willibald Grammer · DE

Inventors

Hermann Meiller · Wernberg-Köblitz, DE
Leonhardt Goetz · Amberg, DE

Key dates

Filing date	Nov 9, 1981
Grant date	Sep 18, 1984
Priority date	—
Expiry date	Nov 9, 2001

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60N2/544
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A driver's seat for tractors or the like has a system such as crossing levers or a parallelogram for keeping it horizontal on changes in level, which take place when a spring under the seat is compressed. For making possible adjustment to different weights of drivers without changing the natural frequency of the springing motion upwards and downwards of the seat, the spring has two runners acting on cams on the levers of the system so that, when the spring is moved in relation to the cams, the leverage of the spring by way of the levers on the top part of the seat is changed. Such horizontal motion of the spring is produced by a carriage pushed backwards and forwards by a threaded rod with a handwheel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.