Full patent is online in Google's patent database
From the patent application text:
The object of my invention is to furnish a device by which to connect or disconnect the sprocket-wheels with the shaft on which they are placed, so that the motion of the shaft may be communicated to the one or the other of the sprocket-wheels, as desired, for the purpose of increasing or decreasing the speed of the bicycle while propelling it on a level or up an incline.and later, "The operation of the device is obvious."
While operation of this gear shift device may be obvious, it was also not a very good design, with two entirely separate chains. Like most bicycle improvement patents of the 1890s, it didn't catch on.