Patent ID: 8376193
Filing Date: 2013-02-19
Classification: B05C

Abstract:
1. A rodless dispenser for dispensing an extrudable material, the rodless dispenser comprising: a cylinder having first and second ends and configured to hold a tube containing extrudable material; a piston within the cylinder; a housing attached to the cylinder; a handle attached to the housing and said cylinder proximate the first end of the cylinder; a reciprocating trigger attached to at least one of: the housing and the handle; a chain sprocket inside the housing, and mounted to and capable of rotating on a one-way bearing that is inside the sprocket and supported by the housing, the one-way bearing rotating in only a first direction around an axis, the sprocket being operatively coupled to the trigger such that actuation of the trigger rotates the sprocket around the axis through a first angle in a second direction of rotation, the second direction being opposite the first direction; a push chain having first and second ends, the push chain being wrapped part way around the sprocket and extending into the cylinder, the push chain first end being coupled to the piston such that sprocket rotation in the second direction causes the push chain to push the piston toward the second end of the cylinder, the second end of the chain being located inside a push chain magazine such that sprocket rotation in the second direction causes the push chain second end in the magazine to move in said magazine toward said second end of the cylinder.