Manually operable tool for installing blind anchor nuts

DETAILED DESCRIPTION I claim: 1.
In a manually operable tool for installing blind anchor nuts by pulling an internally threaded part of the nut into a body part of the nut to expand the latter, the tool including a body member having a bore extending therethrough, an anvil at one end of the bore for engaging the body part of an anchor nut, the anvil surrounding an aperture aligned with the bore, a grip by means of which an operator can hold body member to prevent rotation thereof about the bore, an interchangeable mandrel positioned in the aperture in the anvil, the mandrel having an externally threaded portion extending outwardly of the anvil and a socket facing into the bore, a shaft rotatable and reciprocable in the bore of the body member which shaft is provided at one end with an interchangeable key which fits into the socket on the mandrel in driving engagement therewith, the shaft being provided with a handle outside the body member of the tool by means of which the shaft can be both rotated and reciprocated with respect to the body member, the shaft being reciprocable between a first position in which the key on the shaft engages in the socket on the mandrel thereby allowing rotation of the mandrel by means of the handle, and a second position in which the key disengages from the socket thereby allowing rotation of the handle without rotation of the mandrel, the improvement which comprises the provision of: disengaging means carried by the tool for disengaging said key from said shaft without the need for external tooling for interchanging the same, said disengaging means including key releasing means on both the shaft and the key for both snap-fitting said key onto said shaft and manually removing the key from said shaft upon the application of a force on said key in a direction away from said shaft.
2.
In the tool of claim 1 further including disengaging means carried by the tool for disengaging said anvil from said bore in said body member without the need for external tooling for interchanging the same, said disengaging means including anvil releasing means including a manually movable portion on said body member, said movable portion surrounding said aperture, and locking means on both said movable portion and said anvil for releasing said anvil from said bore in a first position of said movable portion and locking said anvil in said bore in a second position of said movable portion