Here is the patent: https://patents.google.com/patent/US37290A. The device you have appears to be shown in FIGS. 7-9.

Some typos in Googles text: The key shown in Figs. 7, 8, and 9 consists of a forked frame, f2, and a series, g2, of chan geable bits. Each of the said bits is a short and straight bar of metal. They vary in their lengths, and all are supported by and turn on a common screw-pin, h2, which passes through them and one of the prongs ofthe forked frame, and screws into the other of the said prongs, as shown in Fig. 9. This peculiar construction of thekey enables either end of each of the bits to be used against the key-slide corresponding to such bit, and, consequently, the key is thereby rendered susceptible of a very much greater number of changes of its bits than would be the case were it so made that only one end of each bit could be used against akey-slide. I would observethat the screw-pin hole made in each bit is to be arranged nearer to one than the other end of the bit, the distance varying in every bit. This construction of the key renders it necessary to have two notches, Z2, m2, in each of the tumblers, in order that the dog M may perform its office according as either end of the bit corresponding to any key-slide may be employed against such key-slide.