Height adjustment system

A system for indicating the height of a vehicle mounted broom or plow, said system comprising:

• a shaft having a first end, an externally threaded second end and a central portion therebetween;
• said first end of said shaft being rotatably mounted to the broom or plow;
• an internally threaded collar threadably attached to said central portion of said shaft;
• means for producing and monitoring a magnetic field;
• means for producing and monitoring a magnetic field indicative of the position of said internally threaded collar;
• means for producing an electrical signal to said vehicle mounted broom or plow;
• whereby as the broom or plow is moved, said shaft is caused to move axially, which in turn causes said internally threaded collar to move past said means for producing and monitoring a magnetic field, thereby distorting said magnetic field and stopping the electrical signal to said vehicle mounted broom or plow.

A method for indicating the position of a vehicle mounted broom or plow, said method comprising the steps of:

• connecting the first end of a shaft to the broom or plow;
• supporting and guiding the motion of the central portion of said shaft in response to the position of the broom or plow;
• attaching a movable collar to the central portion of said shaft;
• producing and monitoring a magnetic field in response to the position of said shaft;
• whereby the position of the broom or plow may be determined from the presence or absence of said electrical signal.

A method for indicating the position of a vehicle mounted broom or plow, said method comprising the steps of:

• connecting the first end of a shaft to the broom or plow;
• supporting and guiding the motion of the central portion of said shaft in response to the position of the broom or plow;
• attaching a movable collar to the central portion of said shaft;
• producing an electrical signal in response to the position of said shaft;
• whereby the position of the broom or plow may be determined from the presence or absence of said electrical signal.