Screw element for threadedly connecting a multi-part dental prosthesis

• US 5,286,195 A
• Filed: 10/30/1991
• Issued: 02/15/1994
• Est. Priority Date: 12/07/1989
• Status: Expired due to Fees

• Current Assignee: ZL Microdent-Attachment GmbH & Co. KG
• Original Assignee: ZL Microdent-Attachment GmbH & Co. KG
• Inventors: Clostermann, Volkhard-Hagen
• Primary Examiner(s): Wilson, John J.
• Assistant Examiner(s): Lucchesi, Nicholas D.
• Application Number:
  US07/741,397
• Time in Patent Office: 839 Days
• Field of Search: 433/172, 433/173, 433/174
• US Class Current: 433/172
• CPC Class Codes: A61C 8/0018 characterised by the shape
• CPC Class Codes: A61C 8/0068 with an additional screw

Abstract

The screw element is composed of a threaded sleeve (1), a locknut (2) and a cone screw (3). The threaded sleeve (1) has an edge (12) and following the edge (12) a portion (14) that is free of threads; the cone screw (3) has a head (35), a threaded shaft (36) and, between head (35) and threaded shaft (36), a portion (33) that is free of threads; the locknut (2) has an internal cone (22) whose portion having the smallest diameter is provided with an internal thread (23) that is adapted to the threaded shaft (36) of the cone screw (3). The threaded sleeve (36) of the cone screw (3) is screwed into the threaded shaft (1) and its head (35) is supported in the internal cone (22).

Claims

1. A screw element for connecting a multi-part dental prosthesis, comprising:

(a) a hollow sleeve having

(1) a terminal edge surrounding an open end of the sleeve;

(2) a first, internally threadless length portion extending from said end;

(3) a second length portion adjoining said first length portion and being remote from said open end;

(4) a thread provided in said second length portion;

(b) a locknut being separate from said hollow sleeve;

said locknut having

(1) opposite first and second open ends;

(2) a passage extending from said first to said second open end and having a conical wall tapering towards said second open end;

(3) a thread provided in said conical wall along a length portion thereof in a zone of said second end; and

(4) a terminal edge defining said second open end; and

(c) a screw having

(1) a screw head provided with a conical outer wall for complementally fitting into the conical wall of said locknut;

(2) a first, threadless length portion extending from said screw head;

(3) a second length portion adjoining said first length portion of said screw and being remote from said screw head; and

(4) a thread provided in said second length portion of said screw;

said thread of said screw matching with said thread of said locknut and with the thread of said sleeve;

in an untightened state in which said thread of said screw has passed beyond said thread of said locknut, said screw is slidable in and is held captive by said locknut between said second length portion of said screw and said screw head; and

in a tightened state said thread of said screw is in a threaded engagement with said thread of said sleeve, and said conical wall of said screw head is in engagement with said conical wall of said locknut and said terminal edge of said locknut is pressured against said terminal edge of said sleeve.