Manually operated ejector device

Details Manually operated ejector device Manually operated ejector device

1999-03-11

2000-05-16

Mancene, Gene

Dentistry

Apparatus

Having intra-oral dispensing means

433 90, 222137, A61C 504

Patent

active

06062857&

ABSTRACT:
A manually operated ejector device for containing a cartridge loaded with viscous material, having a chamber with a front end adapted to contain the cartridge and a back end, a piston disposed in the chamber for engagement in the cartridge, a handle arranged at the back end of the chamber, and a lever displaceable relative to the chamber and the handle for driving the piston in order to drive the latter in its longitudinal direction toward the front end of the chamber. To improve the safety of the handling of the ejector device, the piston has a spring case and a plunger, the spring case having a chamber whose one end is closed and whose other, front end has an opening, the transition between the chamber and the opening being limited by an abutment surface facing the chamber. The plunger furthermore has a cylinder guided through the opening and, on its back end within the chamber, a plunger head which has a greater diameter than the opening, at least in a direction across the longitudinal axis of plunger and spring case. Between the back end of the plunger head facing away from the cylinder there is disposed a spring unit which is compressible in its longitudinal direction parallel to the longitudinal direction of the piston, the travel stroke of the spring unit being at least as great as the distance to which the spring housing is displaceable in the guide sleeve.

REFERENCES:
patent: 4295828 (1981-10-01), Rudler
patent: 4382789 (1983-05-01), Colombo et al.
patent: 4472141 (1984-09-01), Dragan
patent: 5125836 (1992-06-01), Dragan et al.
patent: 5306147 (1994-04-01), Dragan et al.
patent: 5489207 (1996-02-01), Dragan et al.
patent: 5743436 (1998-04-01), Wilcox et al.

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