Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1988-07-01
1990-10-16
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
744248R, 74459, 187 25, 188 67, 254 98, F16H 2524, F16D 6300
Patent
active
049626744
ABSTRACT:
A normally helically interacting shaft and nut assembly having a common longitudinal axis along which the nut is normally displaced linearly by rotation of the shaft is provided with a wedging surface in a passage, located by or in the nut, inclined at an angle to the longitudinal axis and facing into an aperture in the nut normally partially occupied by a threaded portion of the shaft; and a detent, such as a ball, in the passage. In the event of failure of the normal engagement between nut and shaft (such as can occur with the threads on the nut wearing) free relative linear motion of the nut relative to the threaded shaft causes the wedging surface to displace the detent towards, and into engagement with, the threaded shaft and thereafter maintain the detent in such engagement so as to inhibit further free linear motion by the nut relative to the shaft. At least a part of the nut engaging with the shaft can be of a self lubricating material such as a graphite loaded plastics material.
REFERENCES:
patent: 2758485 (1956-08-01), Jahnel
patent: 2875631 (1959-03-01), Syring
patent: 3304794 (1967-02-01), Bird
patent: 3502358 (1970-03-01), Alspaugh et al.
patent: 4074585 (1978-02-01), Richaud et al.
patent: 4669943 (1987-06-01), Zamotin
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