Patent ID: 11940316
Assignee: ANDREAS STIHL AG & CO. KG
Field: Measurement (Instruments)
Classification: CPC G  B  A  F | IPC B  G

Claim 17:
18. A hand-guided garden, forestry and/or construction machining appliance, comprising:
an operating fluid tank, the operating fluid tank being designed for storage of operating fluid;
an operating fluid pump, the operating fluid pump being designed for delivery of operating fluid from the operating fluid tank;
an optical operating fluid detector for optical detection of operating fluid for the hand-guided garden, forestry and/or construction machining appliance, the operating fluid detector comprising:
a light source, the light source being designed for radiation of rays of light;
an operating fluid line, the operating fluid line being designed for optical interaction of the rays of light from the light source with operating fluid in the operating fluid line for the optical detection of operating fluid;
a light receiver, the light receiver being designed for differing reception of rays of light from the operating fluid line in dependence on a presence or absence of operating fluid in the operating fluid line, wherein

the operating fluid line is designed for differing diversion of the rays of light from the light source in dependence on the presence or the absence of operating fluid in the operating fluid line for the optical detection of operating fluid,
an inner surface of the operating fluid line is designed for the differing refraction of the rays of light from the light source in dependence on the presence or the absence of operating fluid in the operating fluid line for the optical detection of operating fluid,
the operating fluid detector is designed in such a way that, with a radiating light source, the light receiver receives rays of light in the case of the presence and in the case of the absence of operating fluid in the operating fluid line,
the operating fluid detector has an output device, the output device being designed for the output of a fault signal in the case of non-reception,
the operating fluid line is aligned in such a way that the rays of light from the light source impinge on the operating fluid line orthogonally in relation to the operating fluid line, wherein the operating fluid line has a round inner form,
the operating fluid line is connected downstream of the operating fluid tank and upstream or downstream of the operating fluid pump,
the garden, forestry and/or construction machining appliance has a machining tool, and
the operating fluid pump is designed for the delivery of operating fluid to the machining tool for lubricating the machining tool with operating fluid in the form of lubricating fluid.