Patent ID: 7509713

Claim:
A clamp assembly for selectively gripping material, the clamp assembly comprising: a housing having a first end, a second end, a first portion and a second portion, the first and second portions cooperating to define a material receiving slot therebetween, the material receiving slot extending from the first end of the housing and terminating a distance from the second end of the housing, the first portion of the housing having an angular disposed channel and a slot formed therein, the channel having a first end terminating a distance from the first end of the housing and a second end terminating a distance from the second end of the housing, the second portion of the housing having a gripping surface; and a gripping assembly slidably disposed within the channel and through the slot such that the channel and the slot cooperate to define a travel path so that the gripping assembly is selectively movable between a biased first position and a second position, the gripping assembly having a guide plate disposed on an outer surface of the first portion of the housing and a neck member connected to the guide plate so that the neck member extends into and through the slot of the first portion of the housing, the gripping assembly further comprising an axle connected to a lower end portion of the neck member and a plurality of cylindrical rollers connected to the axle such that at least one roller is positioned on each side of the neck member in axial alignment with the other roller and each roller is able to rotate about the axle independently of the other roller, in the biased first position the rollers extending into the material receiving slot so as to be grippingly engageable with material positioned in the material receiving slot and in the second position the rollers being substantially withdrawn from the material receiving slot.