A dumbbell clamp for a barbell and dumbbell safety spotting apparatus [30] utilizes two spaced-apart plates [162] each having a notch [166] for retaining the grip [28] of a dumbbell [26]. A spring-biased lock bar [170] locks the dumbbell grip in the notches during normal use. A clamp bore [178] is provided...http://www.google.com/patents/US7374515?utm_source=gb-gplus-sharePatent US7374515 - Barbell and dumbbell safety spotting apparatus
