Samuel Blatchford, Phoenix Caster Company v. Spiegel…
“ It is well settled that, where a patentee has modified his claim in obedience to the requirements of the patent-office, he cannot have for it an extended construction which has been rejected by the patent-office, and that, in a suit on his patent, his claim must be limited, where it is a combination of parts, to a combination of all the elements which he has included in his claim as necessarily constituting that combination. ”
Samuel Blatchford, Phoenix Caster Company v. Spiegel…
“ My improvement consists in making the axis of the two wheels oscillatory with reference to the article to which the furniture caster is attached. The axis of oscillation, being at right angles to the floor-wheels' axis, allows the wheels to accommodate themselves to ordinary inequalities of floor. Referring to the drawing, A is a flange, from which depends the stem or boss, C. This stem serves as a pivot for the swiveling motion, as a draft-pin for the wheel-housing, and as a means of uniting the parts. ”
Samuel Blatchford, Phoenix Caster Company v. Spiegel…
“ The point of pivot motion is the point of contact between wheel and floor. Such pucker and wear carpets and are sluggish in their swiveling action. Two rollers side by side will, in swiveling, turn in opposite directions, and it will be found that they roll upon the floor, instead of pivoting, as does the single wheel; but, if the floor should be irregular, as is often the case, one wheel of the pair would not touch the floor, and the two-wheeled caster would become practically a one-wheeled caster. ”
