Lawn trimmer cutter head
US4148141A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1978 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Feb 17, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D34/416
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A rotary cutter head for a lawn trimmer or the like has a die cast head body comprising a top circular wall and a depending hub, with a plate riveted to the bottom of the hub for forming a spool to receive a winding of flexible cutting line such as monofilament nylon. A peripheral depending skirt on the circular wall is segmented by spaced downward open notches defined at their axial sides and their tops by convex faces, so as to form line apertures. A molded bottom glide cup has its cylindrical side wall inside and spaced from the segmented skirt by a distance less than the line thickness, with its top edge close below the tops of the notches. The body is mounted on a drive arbor by a nut seated in and removable by manual rotation of the glide cup relative to the body. The cutting line end extends from the winding, over the cup wall edge, through the top of the notch, and then outward in a free length which forms the cutting element. Such wall edge and notch top confine the line to a predetermined plane of rotation, i.e., cutting plane, regardless of axially where on the winding the free length is connected. When the cutting length of the line is worn and needs renewing, it is pul…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.