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Harry Crump
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8600. Crump, H. April 10. Washers. - A washer for bolts and rivets used to secure corrugated or flat sheets, ridgings, flashings, &c. in positions is formed with a tapered boss B, which forces a thin disk of lead &c., placed beneath the washer, into the bolt-hole to form a water-tight joint. A ridge is formed on the upper side of the washer for the bolt-head or nut to rest upon.
GB190608600D1906-04-101906-04-10Improvements in Washers for Bolts and Rivets.
ExpiredGB190608600A
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