(No Model.) R. CAMPBELL, DIFFERENTIAL LEVER, No. 503,561, Patented Aug. 15, 1893,

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UNITED STATES PATENT OFFICE.

ROBERT CAMPBELL OF ALLEGHENY, PENNSYLVANIA. DFFERENTAL LEVER. SPECIFICATION forming part of Letters Patent No. 503,561, dated August 15, 1893. Application filed December 12, 1892, Serial No. 454,932, (No model.) L is a take-up-box or bearing on which the To all, whom it may concern: lever EI is fulcrumed. Be it known that I, ROBERT CAMPBELL, a M, N, O and Pare the connecting-rod, , citizen of the United States, residing in Alle crank shaft and fly-wheel, respectively. gheny, in the county of Allegheny and State When the B is operated by any proper 35 of Pennsylvania, have invented a new and motor force under the control of , &c., useful Improvement in Mechanism, of which proper to engines, the current piston force giv the following is a specification. ing a reciprocatory movement to the cross My invention relates to a forked or slotted head D will cause the lever H to oscillate by differential lever, forming part of the motor 40 O connections of an engine. the power of the cross-head pin G on which The object of my invention is to secure econ the lever is pivoted. The parallel motion of Omy of space without loss of power. This ob the cross-head will give the lever a sliding mo ject I attain by the mechanism illustrated in tion on its fulcrum or bearing L which is fit the accompanying drawing which forms a ted to oscillate with the lever upon the pin or part of this specification. fixed fulcrum I. The effective power of the 45 The figure is a side view of an engine pro piston force is transmitted through the lever vided with a forked or slotted differential le and connecting-rod M to the crank N and Ver as a part of its motor connections. changed to rotary motion. A, B, C, D, E and F are the , piston, Having plainly described my invention, , cross-head, cross-head frame, and what I claim, and desire to secure by Letters so cross-head guides, respectively. Patent, is G is the cross-head pin. In motor connections, the combination of a H is a forked or slotted differential lever. slotted differential lever, a cross-head upon I is a pin, rigidly affixed to the cross-head which said lever is pivoted, a fixed fulcrum, frame E. and a fulcrum-bearing on said fixed fulcrum, 55 25 J, J, are set screws for the bearings of the substantially as set forth. lever H, as connected with the cross-head ROBERT CAMPBEIL. pin G. Witnesses: K is a pin in lever H connecting the lever F. W. CAMPBELL, with the pitmen or M. R. B. CAMPBELL.