Patent ID: 8136249

Claim:
A locking device for securing an attachment member to a main body, comprising: first engagement pawls provided in said attachment member, said first engagement pawls extending parallel to a direction of attachment-detachment of said attachment member and along an inner surface of said main body; and a separate push button assembly which is secured to the inner surface of said main body and provided with second engagement pawls that are engaged to and disengaged from said first engagement pawls; wherein said separate push button assembly is integrally comprised of: a back panel transversely secured to said inner surface of said main body, said back panel further comprising a pair of holes provided therein, a push button protruding through an opening provided in said main body, said push button further comprising a pair of pawls, each of said pair of pawls extended rearwardly through and attaching into one of said pair of holes in said back panel, an amount of protrusion on said push button being limited, and said second engagement pawls being formed on said push button, and a push button return spring that is compressed and installed between said back panel and push button, wherein said main body is a main body casing for a reciprocating electric shaver, and said attachment member is an outer cutter assembly that is attached to and detached from said main body from above.