Knock-on earth working tool securement assembly
US5711378A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Apr 17, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B35/225
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tapered adaptor (10) disposed at a free, leading end of a cultivator shank (S) is arranged to co-operate with a blocking member (27). The blocking member (27) defines forwardly facing abutment surfaces (28, 29). They engage a rear edge portion (54) of the socket (46) of a sweep when the sweep is subjected to a hard impact which would otherwise force the socket beyond the position required for a firm wedging frictional grip with the adaptor (10). Thus, the undesired displacement excessively beyond the required grip position is prevented to enable removal of the socket (46) on exchange of the sweep by a hammer blow. A retainer pin (32) is resiliently held in a transverse groove (31) by the nose (35, 36) of a pair of flat springs. Thus the free movement which might result in loss of the pin 32 is prevented while allowing relatively easy withdrawal of the pin when the sweep is to be knocked off the adaptor. Several alternative embodiments are mentioned. The preferred taper of the adaptor (10) and thus of the sleeve (46) amounts to an included angle of about 2.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.