Cutlery – Cutting tools – Saw
Patent
1981-05-15
1983-09-06
Peters, Jimmy C.
Cutlery
Cutting tools
Saw
200 6145R, 200 6145M, B27B 1702
Patent
active
044021380
ABSTRACT:
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 conducting engagement with an annular ring spaced therefrom and surrounding 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 of 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 actuation 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 located subject to displacement movement, and this luminous diode is directed in an angle of incidence against a reflector surface of the mass body; a photodiode, 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 on 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 engagement surface of the holding part by way of magnetic force.
REFERENCES:
patent: 2890303 (1959-06-01), Clurman
patent: 2996586 (1961-08-01), Shindledecker
patent: 2997558 (1961-08-01), Shindledecker
patent: 3743849 (1973-07-01), Iwata
patent: 3974566 (1976-08-01), Pilatowicz
patent: 4152833 (1979-05-01), Phillips
patent: 4178492 (1979-12-01), Roesch
Glockle Rainer
Glockle Volker
Layer Heinz
Schnaithmann Klaus
Weiss Hermann
Peters Jimmy C.
Stihl Andreas
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