Chemically active decay attacking liquid administering apparatus and fatigue relieving connection therefor

Claim 1

Apparatus for administering chemically active decay attacking liquid to dental caries comprising a. a fluid delivery member adapted to be connected to a source of chemically active decay attacking liquid, b. an applicator, c. an elongated tubular handle connected at one end with said applicator, said handle having exterior surface means for manual engagement by an operator to facilitate maneuverability of said applicator, and interior passage means for delivering fluid from said fluid delivery member to said applicator, and d. means for coupling said tubular handle at an opposite end thereof with said fluid delivery member and for allowing rotary movement of said handle relative to said fluid delivery member without the transmittal of fatiguing torque thereto, said coupling means including (1) a first tubular connecting member connected to said fluid delivery member and having a first shoulder portion disposed substantially perpendicular to the axis of said first tubular connecting member, (2) a second tubular connecting member connected to said tubular handle and having a second shoulder portion disposed substantially parallel to said first shoulder portion, (3) an elongated tubular portion extending from the shoulder portion of said first tubular connecting member, said second connecting member having an opening extending from the shoulder thereof therethrough and receiving said elongated tubular portion for rotation therein in a fixed position wherein a part of said elongated tubular portion extends completely through the opening in said second member, (4) means engaging said part of said elongated tubular portion for retaining said elongated portion in said position without hindering relative rotational movement between said connecting members, and (5) an antifriction and sealing member encircling said elongated tubular portion and disposed between said shouLder portions and operatively engaging both of said shoulder portions when said elongated portion is in said position, said member comprising a ring of anti-friction material, said ring being the only accessory sealing and anti-friction means disposed between said first connecting member and said second connecting member.