Automatic pencil device for automatic drafting and writing machines
US4809023A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1983 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Aug 5, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K21/027
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An automatic lead pencil device has a casing which is releasably mountable in a bracket of a drafting machine. Within the casing, there is a clamp sleeve in which a clamping member is axially movable for clamping and releasing a lead during use of the pencil device. An axial movable lead guide tube projects outwardly of the casing in the rest position, and there is a pencil brake within the lead guide tube. The contact zone between the clamping member and the clamp sleeve is constructed so as to be of the non-self-locking type. There is an operative connection between the clamping member and the lead guide tube such that the clamping member is closed when the lead guide tube moves axially inwardly to assume the working position and opens when the lead guide tube moves axially outwardly toward a rest position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.