# US 4,394,096 A · Attachment system for plastic liners

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- Number: US 4,394,096 A
- Document ID: US4394096A
- Status: Granted
- Kind: A
- Application number: 06/297,023
- Filed: 1981-08-27
- Granted: 1983-07-19
- Earliest claimed: 1981-08-27
- Assignees: Menasha Corporation
- Inventors: Bruce W. Stevens
- Web page: https://patentgrep.com/patent/US4394096A

## CPC

- F16B 43/00: Washers or equivalent devices; Other devices for supporting bolt-heads or nuts (circlips F16B21/18; {for indicating tensile load F16B31/02; forming a whole with the bolt or nut F16B33/00; locking bolts or nuts by means of a fixed plate or ring, or washer-like resilient plates F16B39/10, F16B39/24})
- F16B 37/14: Cap nuts; Nut caps or bolt caps
- Y10S 411/91: Antitamper means
- Y10T 403/7123: Traversed by connector
- Y10T 403/75: having a joining piece extending through aligned openings in plural members
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A flush capped bolt system for attaching a plastic liner to a substrate includes a cap with a radial sealing skirt that seals against the walls of a counterbored recess at the liner surface. In the preferred embodiment, a squared portion on the bolt shank deforms a liner opening to provide a nonrotatable engagement, and there is a plastic wear washer to accommodate lateral movement allowed by an oversized substrate opening. The system is readily adapted for field installation using conventional tools.

## Claims

### Claim 1

In a system attaching a plastic liner to a substrate using a bolt with a plastic capped head that is received in an enlarged recess at the exposed liner surface to be flush with said surface and that has an attachment shank that extends through a shank opening in the liner at the bottom of the recess and into the substrate,
the improvement wherein:
the recess is straight-sided; the cap is straight-sided and includes a pheripheral portion that extends around the periphery of the bolt head and is peripherally smaller than the recess; and the peripheral portion includes a radially outwardly extending sealing skirt that is peripherally larger than the recess and is rolled upwardly when the bolt is inserted into a sealing engagement with the sides of the recess.

### Claim 2 (depends on 1)

A system according to claim 1, wherein: the cap peripheral portion also includes a radially inwardly extending rim that extends partially under the bolt head and holds the cap thereon.

### Claim 3 (depends on 1)

A system according to claim 1, wherein: the recess, cap peripheral portion and skirt are all circular.

### Claim 4 (depends on 3)

A system according to claim 3, wherein:
the shank opening in the liner is circular; and the bolt shank has a non-circular portion that is deformingly received in and deforms the liner shank opening providing a non-rotatable engagement between the bolt and liner.

### Claim 5 (depends on 4)

A system according to claim 4, and in which the substrate has an oversized shank opening aligned with the liner shank opening, the shank extends through the substrate shank opening beyond the opposite surface of the substrate, and a nut means engages the shank and bears against the opposite surface of the substrate, wherein:
the nut means includes a plastic washer that bears directly against the opposite surface of the substrate.

### Claim 6 (depends on 5)

A system according to claim 5, wherein:
the cap peripheral portion also includes a radially inwardly extending rim that extends partially under the bolt head holding the cap thereon.