B - Operations – Transporting – 27 – B
Patent
B - Operations, Transporting
27
B
143/84
B27B 17/00 (2006.01) B27B 17/08 (2006.01) F16P 7/02 (2006.01)
Patent
CA 1161341
ABSTRACT OF THE DISCLOSURE A safety device for a power chain saw or the like The safety device has a mass body which is responsive to acceleration forces and is operatively connected with a brake device. The mass body has at least one support part under a holding force, the mass body being displaceable from a rest position under the effect of the acceleration force (a "monostable inertia switch"). The mass body in a preferred embodiment is made as a bar or rod magnetically attracted to a supporting surface and capable of being tilted from an upright or vertical position temporarily into electrically con- ducting engagement with an annular ring spaced therefrom and sur- rounding the upper free end of the bar or rod, permitting electrical connection to be established to actuate a brake device for stopping the power chain saw in case of an emergency, including tripping, falling, slipping, or sudden shock, as a safety feature for an operator of the power chain saw. Alternatively, uniformly spaced spring means can be provided radially aligned relative to a ball or spherical member also serving as an inertia body for triggering a brake release or actuation signal responsive to acceleration force in all directions rather than only in one plane of movement. A permanent magnet or electromagnet can be used for purposes of actu- ation of the brake device responsive to accelerating force in any direction. Also, a luminous diode may be arranged in a cover for a recess in which the mass body in the form of a ball or rod is lo- cated subject to displacement movement, and this luminous diode is directed in an angle of incidence against a reflector surface of the mass body, a photo-diode, photo-transistor or the like is arranged in an angle of reflection relative to the reflector surface. Alternatively, on the cover there is arranged a magnet switch or dry-reed switch, or an inductive or capacitive proximity switch, above the mass body. Control lines are connected and provided with a holding part and an abutment part which are both electrically conductive; an insulation is arranged between the holding part and the abutment part as well as on the outer surface thereof. A cover is arranged above the mass body in the side remote from the counter engagement surface of the holding part; this cover is spaced above the mass body by a distance which is less than the depth of the recess. The mass body may be a permanent magnet, and has an engagement surface which engages against a counter en- gagement surface of the holding part by way of magnetic force.
377677
Glockle Rainer
Glockle Volker
Layer Heinz
Schnaithmann Klaus
Weiss Hermann
Fetherstonhaugh & Co.
Firma Andreas Stihl
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