| 摘要 |
A doorbell for pets consisting of a pair of scratch plates adapted to be hung movably respectively on the inner and outer surfaces of a door of a house or other building for yieldable movement toward said door under the impetus of a pet's scratching thereagainst, and an electrical system including an audible signalling device operable by switches mounted in the door and actuated by said scratch plates. Provision is made for maintaining operation of the signalling devices for any desired length of time despite merely momentary movements of the scratch plates, and for adjusting the force required to actuate the signals, both to prevent accidental operation by blowing wind, and to accommodate the device to pets of different sizes and strengths. The signals may be audibly distinguishable, to indicate whether the animal desires ingress or egress.
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