Patent Model - Improvement in Washers for Screw-Bolts

Maker and role
Nathan Thompson Jr. (b.1817, d.1888), Patentee
Production date
Feb 22 1870
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Object detail

Wood, iron
3 1/2 x 4 3/4 x 2" (8.9 x 12.1 x 5.1cm)
Thompson's patent objective "is to construct a washer applicable to screw-bolts of ordinary make, whether used in connection with a nut or otherwise, and applicable to other purposes and uses, which, while possessing all the advantages of a solid metal washer, so far as its bearing-surfaces are concerned, is of a yielding or elastic character, in direction of its thicknesses, to compensate for the contraction and expansion of the parts to which it is applied, and to prevent jar from loosening the fastenings with which it is used." (Patent Number 100,214)
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