SCREW GROMMET

• US 3,869,958 A
• Filed: 09/13/1972
• Issued: 03/11/1975
• Est. Priority Date: 09/13/1971
• Status: Expired due to Term

• Current Assignee: Hiroo Murayama
• Original Assignee: Hiroo Murayama
• Inventors: Murayama, Hiroo
• Primary Examiner(s): Britts, Ramon S.
• Application Number:
  US05/288,625
• Time in Patent Office: 909 Days
• Field of Search: 85/80,5R,84 24/28A,213R,213CS,214,73P,73PM,73HS 151/41.75
• US Class Current: 411/15
• CPC Class Codes: F16B 21/076 the socket having a resilient part on its outside F16B21/075 takes precedence
• CPC Class Codes: F16B 21/086 the shank of the stud, pin or spigot having elevations, ribs, fins or prongs intended for deformation or tilting predominantly in a direction perpendicular to the direction of insertion
• CPC Class Codes: F16B 37/043 with snap action
• CPC Class Codes: Y10S 411/913 Self-expanding anchor

Abstract

This invention relates to a unique and improved one-piece plastic anchor device for accommodating the threaded shank of a screw member when positioned within a work aperture. The anchor device disclosed herein includes a head section for clampingly engaging one side of a workpanel, and a bisected shank section comprising a longitudinal hollow portion for accommodating a screw shank and longitudinal reinforcing rib portions.

Claims

1. A one piece plastic anchor device for application to a noncircular apertured workpanel to accommodate a threaded shank of a screw member, said anchor member including a head section providing a surface for clampingly engaging one side of the workpanel and a tapered shank section extending longitudinally from said head section, said head and shank sections being bifurcated by a common slot which extends through said head into said shank to a point adjacent the free end of said shank defining a pair of shank sections where said shank sections are integrally joined, each of said shank sections including an inner wall extending from the head to the free end and having a central screw receiving axially extending groove which extends through each section of said head and an outer wall spaced from the inner wall also extending from the head to the free end and which is tapered outwardly from the free end to an intermediate point spaced from said head to define an impositive shoulder for initial engagement with the opposite surface of sAid workpanel, said outer walls over a limited axial extent thereof between said head and a transverse plane axially spaced below said shoulder being flexible toward one another so that insertion of the fastener into any one of a plurality of different sized apertured workpanels will flex said outer wall inwardly to form a positive shoulder for retention and integrally connected rigid reinforcing means extending radially from each inner walls to the adjacent outer walls and further extending axially from said free end to said transverse plane axially spaced from said shoulder to reinforce said outer wall and adapted to reinforce said positive shoulder by strut action when a screw is introduced into said groove and expands the shank sections.