GB Patent: GB-548,615
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| Improvements relating to male spanners for use with a screw having a non-circular recess to receive the spanner
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Patentee:
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| Leslie Lionel Long (exact or similar names) - Coventry, Warwickshire, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 09, 1941 |
| Granted: |
Oct. 16, 1942 |
| Antedated: |
Oct. 09, 1941 |
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Patent Pictures:
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British patent GB548615 -- edited from ESPACENET |
Espacenet patent
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Stan Schulz
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Description: |
| Rounded end, and circumferential groove combine to allow a driver to turn a "hollow head" screw or bolt even when not in direct line. The drawings show the principle applied to a hex "Allen wrench" type tool; decades later a similar device was patented and marketed as "ball driver." |
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