Safety device for gear wheels
OwnerMartin Birger Aberginventor
Life of this patent
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Abstract
A gear wheel is provided with a safety release disc adjacent one face thereof, said disc having teeth formed as direct extensions of the gear wheel teeth. The disc teeth engage the same gear element as the teeth of the gear wheel but the disc is rotatable on the gear wheel axle. In the event of tooth wear or tooth breakage of the gear wheel the gear wheel will turn relative to the disc, which has no rotational load. This relative movement is utilized to trip signalling or locking devices as desired.
Claims11
A safety device for use with a toothed wheel structure whose teeth engage a toothed element arranged to trip a protection device when a tooth of the toothed wheel structure is broken or when there is a predetermined amount of tooth wear, characterized in that the device comprises a tripping element mounted so as to be rotatable relative to said toothed wheel structure said tripping element having a rim of teeth with the same pitch as the teeth of said toothed wheel structure so that the teeth of said tripping element also engage the toothed element or an element synchronically movable therewith, and signalling means responsive to relative rotary movement between said tripping element and said toothed wheel structure for tripping a protection device when there is rotary movement between said tripping element and said toothed wheel structure beyond a given angle.
Dependencies are inferred from the claim text.