Title: Automatic assembly apparatus for bolts and nuts

Abstract: Automatic assembling method to screw a nut on a bolt comprises steps of detecting a position of a bolt which is maintained by a supporter, and of positioning in rough a nut thereto by a positioning mechanism, in which the nut is supported by an attachment coupled with a motor through an elastic mechanism, which is capable of deformation in both directions of an axis and a radius. The nut, then is movably pressed against the bolt and rotated by the motor. When the nut is not screwed on the bolt, the positioning mechanism changes its position in two dimensions so that the nut is maintained movably pressed against the bolt and the nut is rotated again. The changing position of the positioning mechanism will be continued until the nut is screwed on the bolt.

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Inventors: Kato, Kanji (Kokubunji, JA)
Goto, Tatsuo (Tokyo, JA)
Inoyama, Tadao (Yokohama, JA)

Application Number: 636840
Filing Date: 1975-12-02
Publication_date: 1977-09-20
Assignee: Hitachi, Ltd. (JA)
Primary Class(es): 470/45 29/240, 29/407.1, 29/705, 29/714, 29/720, 470/49
Other Classes:
US Patent Ref:

2763173	Sep, 1956	Bailey et al.	10/155.
2943335	Jul, 1960	Daniel et al.	10/155.
3581375	Jun, 1971	Rottmann	29/407.
3824674	Jul, 1974	Inoyama et al.	29/407.
3885295	May, 1975	Engelberger et al.	29/208.

Other Refs: 248,476

Jul, 1969	SU

Primary Examiner: Combs, E. M.
Assistant Examiner:
Attorney: Craig & Antonelli