Screw cap

• US 5,697,745 A
• Filed: 12/05/1995
• Issued: 12/16/1997
• Est. Priority Date: 12/05/1995
• Status: Expired due to Fees

• Current Assignee: Jack B. Shaw
• Original Assignee: Jack B. Shaw
• Inventors: Shaw, Jack B.
• Primary Examiner(s): Meyers, Steven N.
• Assistant Examiner(s): ESTREMSKY, GARY WAYNE
• Application Number:
  US08/567,774
• Time in Patent Office: 742 Days
• Field of Search: 411/258, 411/82, 411/930, 411/429, 411/431, 411/377, 411/259, 411/525, 411/526
• US Class Current: 411/258
• CPC Class Codes: F16B 37/14 Cap nuts; Nut caps or bolt caps
• CPC Class Codes: Y10S 411/93 Flowing metal or settable material

Abstract

A push-on cap for covering the pointed, threaded end of a metal screw. The cap is filled with a polymer inert to the metal, and a curing catalyst, whereby the polymer and curing catalyst are separated until the cap is placed on the screw. The push-on cap is also readily removable from the screw.

Claims

1. A push-on cap for covering the pointed, threaded end of a metal screw, the cap comprising a body having a closed end and an open end, said open end terminating in a lip extending laterally from said open end, being covered by a snap-on lid, said lid including a lip extending downwardly and inwardly to co-act with said lip of said cap, the body being filled with a polymer, said lid including an encapsulated curing catalyst, the polymer and curing catalyst being separated until the cap is pushed onto the screw.

2. The push-on cap according to claim 1, wherein said body has a polygonal shape whereby the cap is readily removable from the screw.

3. The push-on cap according to claim 1, further comprising a foil capsule containing a catalytic agent between the lid and the open end of the body, the capsule being rupturable by the screw when the screw is pushed onto the cap.

4. The push-on cap according to claim 1, wherein the polymer and curing catalyst are separated by a rupturable membrane.

5. The push-on cap according to claim 1, wherein the polymer is encapsulated.

6. A push-on cap for covering the pointed, threaded end of a metal screw, the cap comprising first and second pieces joined together, the first piece comprising a body having a closed end and an open end, said open end terminating in a lip extending laterally therefrom, the body being filled with component B, the second piece comprising a conical insert that fits securely into the first piece and is filled with component A, said conical insert terminating at an upper end lip extending inwardly to co-act with the lip of said first piece, one of components A and B being a polymer of the screw with the other being a curing catalyst therefor, whereby when the cap is placed on the screw, the screw ruptures the conical wall of the second piece allowing components A and B to mix.

7. The push-on cap according to claim 6, wherein said body has a polygonal shape whereby the cap is readily removable from the screw.