Precision driving apparatus

Details Precision driving apparatus Precision driving apparatus

1979-03-16

1981-03-24

Staab, Lawrence J.

Machine element or mechanism

Gearing

Directly cooperating gears

74409, 74411, F16H 104

Patent

active

042572860

ABSTRACT:
A precision driving apparatus of the type comprising a pinion and a rack in mesh with the pinion is improved to assure always a good engagement between the pinion and the rack throughout the length of the rack. The rack is formed by monoblock molding of synthetic resin material so as to comprise, as the integral parts thereof, a tooth part, a base part, a connection part and a distance limitation part. The connection part elastically connects the tooth part and base part at both ends thereof in such manner that the tooth part may be displaced only in the direction normal to the direction in which the rack is moved, without any deformation of the tooth part itself. The limitation part serves to limit the distance between the tooth part and base part to a value less than the module of the teeth of the rack to prevent the engagement between the tooth part and the pinion from getting shallow by an external force working in the direction of movement of the rack and to prevent the tooth top of the tooth part or of the pinion from being broken thereby.

REFERENCES:
patent: 2466218 (1949-04-01), Farrell et al.
patent: 3854418 (1974-12-01), Bertin

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