OutdoorKing Repair Forum Forums The History Forum Component Histories GREENFIELD - Theo Reinhold Patents 1980s

PATENT 34531 of 1989 - Part One
This patent is titled �Improvements to Lawnmowers�, and it deals with three
separate components to walk behind � domestic - rotary lawnmowers.

The first idea is a Back-To-The-Future re-design of one of the main features
of early rotary lawnmowers � the ability to cut close to edges
[see Figures 1, 2 & 3].

Modern high arch designs have resulted in offset pairs of wheels � the
�outer side� enabling a clear flow of the grass chute to the catcher; the
'inner side� for edging (getting as close as possible to the edge).

This patent address the reality of thick aluminium bases [for strength]
preventing a closer gap between blade tip and lawn edge. Theo�s solution,
a thin cover plate [I guess of plastic or steel] over a base cut-out on
the inner side of the lawnmower.

The second idea concerned handle mounting [Figure 4]. A simple arrangement
that I wish had been adopted on those cheap entry-level steel bases we see
today! The idea is that the base itself (via a cast or pressed recess)
locates and takes the pivotal movement of side-mounted handle bars.



The third idea concerned the blade holder. It is of �square cross-sectional
configuration� and the holder is dished. This is one for the purists, and
I see some advantage in the design. It certainly makes tool access to the
blade bolts easier. Probably better for manufacture too.




TO BE CONTINUED ...