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AssigneeDentaurum J.P. Winkelstroeter KG
InventorsFriedrich Binder, Horst Kalytta, Manfred Rapp, Friedrich-Wilhelm Rohlcke, Berthold Walter
Estimating the term…
Expansion screw for tooth adjustment having two expansion screw body members each embeddable in a plastic palate plate, these body members being provided with retention grooves for anchoring in the plastic of these palate plates, also having a threaded spindle and two guide pins, wherein the threaded spindle has spindle sections with opposite threads on either side of a central section, these spindle sections engaging in corresponding threaded bores of the expansion screw body members, and wherein the latter have guide openings for the passage of the guide pins extending parallel to the threaded spindle. In order to reduce the size of the two expansion screw body members, the latter are of a hat-shaped design in the side view and provided at their central regions with retention grooves and, in addition, at their facing inner end faces with recesses for accommodating the central section of the threaded spindle, these recesses being designed such that these end faces can abut on one another when the threaded spindle is turned and that in this state of the expansion screw the central section of the threaded spindle provided with a tool attachment point is accessible from the outside.
An expansion screw for tooth adjustment having two expansion screw body members each embeddable in a plastic palate plate, the body members being provided with retention means for anchoring in the plastic of said palate plate, also having a threaded spindle and at least one guide pin, wherein the threaded spindle has spindle sections with opposite threads on either side of a central section provided with a point of attachment for a tool for turning the threaded spindle, the spindle sections engaging in channels provided with corresponding internal threads in the expansion screw body members for altering the distance of the two expansion screw body members from one another, and wherein the expansion screw body members have guide openings for the passage of said at least one guide pin extending parallel to the threaded spindle, each expansion screw body member being stepped at an outer end face remote from an outer end face of the other body member such that a first region of said expansion screw body member accommodating one of the channels protrudes in the longitudinal direction of the threaded spindle beyond a second region of said expansion screw body member accommodating the guide opening for said at least one guide pin wherein the retention means are arranged at the first regions of the two expansion screw body members, and the channels are designed at facing inner end faces of the two expansion screw body members to accommodate the central section of the threaded spindle whereby in a non-expanded initial state of the expansion screw said inner end faces are adapted to abut at least almost against one another, and wherein the expansion screw body members have at least one recess through which, in the initial state of the expansion screw, the tool attachment point of the threaded spindle is accessible from the outside of the expansion screw.
Dependencies are inferred from the claim text.