For holding and securing keys in asylums, prisons, hotels and other places where many keys are required to be kept for the usual service, holding them in such way that they can only be removed by one having the proper release key, the Improvement shown in the ac-companying illustration has been patented by Richard Hensley, of Salem, Oregon. Fig. 1 is a face view of the device, which is represented in section in Figs. 2 and 3, Fig. 4 showing the key. The key-holding hook is pivoted to swing-down, as shown in dotted lines, and at its upper end is a bevel and notch adapted to engage a bolt of the lock on the rear of the face plate, as shown in Figs. 2 and 3, the bolt being spring-pressed and being disengaged from the hook by the release key.
This article was originally published with the title "A Key Retaining Device"