Plunge-type router having improved plunge return capability
US7018149B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2004 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Aug 18, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/306608
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A preferred embodiment router is disclosed having a housing which supports a motor wherein the housing is vertically movable along a pair of spaced vertical guide posts of a base structure and wherein the router includes a flexible baffle which can vertically expand and contract as the housing is moved relative to the base structure and wherein at least one post has a coil spring located within the baffle which is configured to bias the housing away from the base structure, with the coil spring having a generally hourglass shaped configuration. The configuration has outer end portions with larger coil diameters, both of which transition to a center portion with a smaller coil diameter. The hourglass configured coil minimizes the possibility of the coil buckling which could result in a loss of spring force as well as a distortion of the shape of the baffle. Also, the amount of travel that is permitted by the hourglass spring is larger than would be achieved by a comparable uniform coil diameter spring made from the same material, because a number of coils can be telescoped together to produce a smaller compressed or solid height of the spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.