US Patent: 4,644,831 
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| Adaptor Sleeve
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	        Patentee:
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 | Miriam Yang (exact or similar names) - Ta Li Hsiang, Taichung Hsien Taiwan |  
 
 
 
 
 
 
 
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        Patent Dates:
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| Applied: | 
Jul. 05, 1985 | 
 
| Granted: | 
Feb. 24, 1987 | 
 
 
 
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		  Patent Pictures:
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Miriam Yang patent February 24, 1987  |  
 
USPTO (New site tip) Google Patents 
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                        Stan Schulz 
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        Description: |  
| Holder socket, with an internal "U" shaped spring retaining clip.
Known example appears on a 1/4" hex-drive flexible shaft extension for screwdriver or nut driver bits.  It is marked U.S.A. PAT 4644831 ROC PAT 27181.
Cites pat. nos. 717,199, 853,930, 1,056,848, 2,158,728, 2,677,294, 3,665,791, and 3,935,762. |  
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