Patent 1981
Patent Summary
An image of the patent summary for number 1981.
Name/Title
Patent 1981Entry/Object ID
2025.3.87Tags
1800s, british, patent summary, shears, sheep, marsdenDescription
1981. Marsden, H. M. July 28. Shears. -- Relates to various methods of making spring bow shears for shearing sheep and for other purposes. The bar or strip blank is made of combined iron and steel. The steel may pass right through the bar and be covered by the iron, as shown in Fig. 2, or it may pass part of the way in from each side, as shown in Fig. 3, or from one side only, as shown in Fig. 3a. When the article has been forged to shape, the steel is exposed by grinding to form the cutting edge. In forging shears, the blanks may be pared or punched out but it is preferred to first thicken the back of the blade when needed and then, bending forward the heel of the blade as shown in Fig. 4, to turn or twist up the blades till they stand at right-angles to the portion of the blank intended to form the shanks and the bow. The shanks are then hollowed and the knees formed. The grinding is preferably done while the blank is flat. In another method of construction, the shears are made in two or three parts, the bow being either a separate piece or in one with one of the blades and its shank. The ends of the bow are extended and hollowed to fit underneath the shanks and are attached by rivets and screws, the ends of the shanks being formed with fish-tailed or T-headed ends fitting corresponding holes in the bow. In another method, strips of "good selected iron or "semi-steel" are used and the edges are hardened by a process of cementation prior to the final forging. In another method, the shears are forged in one piece from rolled rods or bars "of cast, "shear, or other suitable steel, or combinations of "steel with steel" or "steel with steely iron, or "steel with iron." Steel bars are forged down directly by rolling or hammering into the form shown in Figs. 4a and 4b. Rods of iron and steel are twisted half a turn near each end before forking down in this way and are manipulated so as to keep the steel in its right position. Figs. 4e, 4f, and 4g show the process of forging from a rod or bar to a form ready for bending up the blades, hollowing the shanks, &c.Cataloged By
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