Permanent lawn mower

A device for cutting grass, the device permanently installed in soil, the device comprising:

• a housing;
• the housing installed by being buried within the soil;
• the housing includes internal threads;
• a cutting head;
• the cutting head having a first position and a second position:
• the first position being the cutting head within the housing, awaiting activation;
• the second position being the cutting head extended out of the housing, ready to cut grass;
• a cutting head shaft;
• the cutting head shaft within the housing;
• rotation of the cutting head shaft causing rotation that creates upward movement along the internal threads of the housing, thus causing operation of the cutting head;
• a motor;
• the motor rotating to cause the cutting head to move from the first position to the second position;
• an ascender;
• the ascender internally splined to interact with external splines of the cutting head shaft;
• the ascender externally threaded to interface with the internal threads of the housing;
• rotation of the cutting head shaft causing rotation of the ascender, in turn causing extension or retraction of the cutting head;
• whereby the ascender interacts with the housing to convert rotational motion of the cutting head shaft into upward and downward movement of the cutting head;
• and
• whereby the device for cutting grass is installed in areas where conventional mowing is difficult.

A permanent lawn mower for installation in soil, the permanent lawn mower comprising:

• one or more cutting heads;
• the one or more cutting heads each including a blade that extends up and out of a housing, the blade cutting surrounding grass, the blade then retracting into the housing;
• each cutting head of the one or more cutting heads surrounded by the housing when in a retracted position;
• the housing includes internal threads;
• each cutting head of the one or more cutting heads moving along a cutting head shaft;
• rotation of the cutting head shaft causing rotation that creates upward movement along the internal threads of the housing;
• a drive unit;
• the drive unit rotating the cutting head shaft;
• the drive unit causing the one or more cutting heads to extend up and out of the housing;
• the drive unit causing the blade to oscillate, creating a cutting action;
• the drive unit causing the blade to retract into the housing;
• an ascender;
• the ascender internally splined to interact with external splines of the cutting head shaft;
• the ascender externally threaded to interface with the internal threads of the housing;
• rotation of the cutting head shaft causing rotation of the ascender, in turn causing extension or retraction of the one or more cutting heads;
• whereby the one or more cutting heads are installed in areas that are difficult to access, thus avoiding use of a mobile lawn mower.