Monitoring device for machine parts
First Claim
1. A ground working machine comprising a frame, a portion of said frame mounting a plurality of soil working tools, driving means connected to rotate said tools about respective upwardly extending axes defined by corresponding shafts for said tools, monitoring means adjacent said driving means and said monitoring means including an electrical generating device in a circuit, said device independently generating electrical current to a signal element in said circuit responsive to the rotational movement of a said shaft of at least one of said tools, said shaft having an upper end journalled in a bearing supported by a bearing housing at the upper side of said frame portion, said device comprising two parts including an inductance part and a permanent magnet part, said magnet part being held in a bore in said upper shaft end and positioned off center with respect to the said axis of said shaft'"'"'s rotation, said inductance part being mounted in the top of said bearing housing, located adjacent and above said upper shaft end, said inductance part being positioned off center with respect to the shaft axis of rotation whereby the rotational movement of said shaft relative to said inductance part generates a current during the normal rotation of said tool shaft and said signal element is actuated.
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Abstract
A machine has two relatively movable portions and relative movement between the portions is sensed by means generating an electric current. In the preferred embodiment this means comprises a permanent magnet on one portion and an induction coil and a soft-iron core on the other portion. The two portions are parts of an overload coupling interconnected with a shear pin. When the coupling is overloaded, a shear pin fractures and the two portions rotate relative to one another. This causes a current to be generated in the coil which actuates a signal element. The device provides a visual indication of the operative condition of the two portions.
25 Citations
11 Claims
- 1. A ground working machine comprising a frame, a portion of said frame mounting a plurality of soil working tools, driving means connected to rotate said tools about respective upwardly extending axes defined by corresponding shafts for said tools, monitoring means adjacent said driving means and said monitoring means including an electrical generating device in a circuit, said device independently generating electrical current to a signal element in said circuit responsive to the rotational movement of a said shaft of at least one of said tools, said shaft having an upper end journalled in a bearing supported by a bearing housing at the upper side of said frame portion, said device comprising two parts including an inductance part and a permanent magnet part, said magnet part being held in a bore in said upper shaft end and positioned off center with respect to the said axis of said shaft'"'"'s rotation, said inductance part being mounted in the top of said bearing housing, located adjacent and above said upper shaft end, said inductance part being positioned off center with respect to the shaft axis of rotation whereby the rotational movement of said shaft relative to said inductance part generates a current during the normal rotation of said tool shaft and said signal element is actuated.
- 9. A ground working machine comprising a frame, a portion of said frame mounting a plurality of soil working tools, driving means connected to rotate said tools about respective upwardly extending axes defined by corresponding shafts for said tools, monitoring means adjacent said driving means and said monitoring means including an electrical generating device in a circuit, said device independently generating electrical current to a signal element in said circuit responsive to the rotational movement of a said shaft of at least one of said tools, said latter shaft having an upper end journalled in a bearing supported at the upper side of said frame portion, said device comprising two parts including an inductance part and a permanent magnet part, said magnet part being affixed to said upper shaft end and at least one of said magnet'"'"'s poles being positioned off center with respect to the said axis of said latter shaft'"'"'s rotation, said inductance part being mounted and located adjacent and above said upper shaft end and off center with respect to said latter shaft'"'"'s axis of rotation whereby the rotational movement of said latter shaft and said one magnetic pole relative to said inductance part generates a current in said inductance part during the normal rotation of said latter shaft and said signal element is actuated.
Specification