Device for receiving and dispensing a coatable material
View Patent ↗A device for receiving and dispensing a coatable material such as adhesive, glue, cosmetics and the like. A sleeve-shaped receiving element has a piston-shaped element carrying the coatable material that is displaceable in longitudinal direction by a screw spindle operated by an external rotary grip at the base of the receiving element. The underside of the piston-shaped element is formed to complement the inwardly protruding shape of the sleeve base or grip element, such that there is virtually no free space in which air can collect between the piston-shaped element and the sleeve base when the piston element is fully retracted in the receiving element. Thus the device avoids undesired bubble formation during the filling process, and undesired material break off during use can be largely excluded.
1. A device for receiving and dispensing a coatable material, comprising a sleeve-shaped receiving element having an interior, a delivery end, and a sleeve base generally opposite the delivery end, in which receiving element interior is arranged a piston-shaped element having an internal thread, said piston-shaped element being adapted to carry the coatable material on a side facing the delivery end of the receiving element, and having an underside facing the sleeve base, the piston-shaped element being arranged to be secure against rotation and to be displaceable longitudinally in either direction within the receiving element from the sleeve base toward the delivery end, the piston-shaped element being displaceable in the receiving element by an externally operable rotary grip provided at the sleeve base, wherein the rotary grip comprises a screw spindle that is rotatably mounted and secured in axial direction in a passage opening of the sleeve base and that is cooperable with the internal thread of the piston-shaped element, wherein a region of the rotary grip projects inwardly through the passage opening into the receiving element interior and is formed complementary to the underside of the piston-shaped element, the region of the rotary grip being conical or funnel shaped between the screw spindle and a detent bead of the rotary grip, which bead bears in a detenting manner with the sleeve base, whereby free space between the piston shaped element and the sleeve base is confined to a region intermediate the complementary underside of the piston-shaped element and the region of the rotary grip when the piston-shaped element is adjacent the sleeve base.
2. The device of claim 5, wherein the piston-shaped element comprises a cylindrical outer wall and an inner wall that forms a conical or funnel shape on the underside of the piston-shaped element, complementary to the inwardly-projecting sleeve base or rotary grip.
3. The device of claim 2 , wherein the piston-shaped element has at least one ventilating opening communicating the underside of the piston-shaped element with the interior of the sleeve-shaped receiving element.
4. The device of claim 2 , wherein at least one ventilating opening comprises a ventilating bore or ventilating groove.