GB Patent: GB-189,352
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| Improvements in jigs for facilitating drilling operations
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Patentee:
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| William Alfred Pearn (exact or similar names) - Rusholme, Manchester, England |
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Patent Dates:
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| Applied: |
Dec. 03, 1921 |
| Granted: |
Nov. 30, 1922 |
Espacenet patent
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Jeff Joslin
Vintage Machinery entry for Frank Pearn & Co., Ltd.
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Description: |
| "Jigs for drilling comprise a base plate d pivotally secured by a bolt to the machine table and T-slotted for clamping the work a between brackets b, c. Templets f are secured between the work and the brackets which may be spigoted to engage the work and permit axial rotation to bring parts such as j into position for drilling. The brackets have openings to permit all the holes to be drilled at the one setting, and in the example shown the brackets are connected by a tie bolt passing through the cylinder to be drilled. In other examples the jigs are described as set up for drilling pump barrels and valve boxes." |
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