Vertical and pivotal adjusting apparatus for drafting tables
US4807836A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Mar 15, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47B27/14
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Apparatus for supporting a drafting table, such as a digitizer, for vertical and pivotal movement thereof wherein a fixed hollow column is supported on a base member and a movable hollow column is mounted inside of the fixed hollow column for vertical up or down movement thereof and wherein the weight of the drafting table is counter-balanced by a constant spring mounted on the upper portion of the fixed hollow column and on the lower portion of the movable hollow column so that a portion of the constant spring is between the fixed and movable hollow columns and an elongated support member mounted on the upper portion of the movable hollow column and extending generally in a horizontal direction for supporting the drafting table and pivot means for pivotally connecting the drafting table to the elongated support member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.