Sample transfer arm assembly
US4235840A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1979 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | May 10, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2035/1086
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The assembly includes a horizontally disposed sample transfer arm which is mounted to and extends radially outwardly from a vertically positioned cylindrical support member. A drive shaft is coupled by a drive mechanism to the cylindrical member for rotating the cylindrical member a predetermined arcuate distance to move the transfer arm between a first position over a first receptacle and a second position over a second receptacle. Locating stops associated with the cylindrical support member define and limit the arcuate movement of the arm. The drive mechanism includes a lost motion clutch assembly including a flat cam member which has a generally rectangular cross-section, which is fixed to the top of the drive shaft and which is received in a slot in the cylindrical member that extends axially inwardly from one end of the cylindrical member and that has a generally rectangular cross-section greater than the rectangular cross section of the cam member. A wide, generally U-shaped spring clip has a flat bight portion situated within the slot at the inner end thereof and has two leg portions which extend toward each other and which have opposed outer ends which are spaced apart a d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.