# US 4,392,278 A · Fastener

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- Number: US 4,392,278 A
- Document ID: US4392278A
- Status: Granted
- Kind: A
- Application number: 06/239,224
- Filed: 1981-02-27
- Granted: 1983-07-12
- Earliest claimed: 1980-02-20
- Assignees: Illinois Tool Works Inc.
- Inventors: Peter R. Mugglestone
- Web page: https://patentgrep.com/patent/US4392278A

## CPC

- F16B 19/004: {made in one piece (F16B21/084 takes precedence)}
- F16B 21/084: {with a series of flexible ribs or fins extending laterally from the shank of the stud, pin or spigot, said ribs or fins deforming predominantly in a direction parallel to the direction of insertion of the shank}
- Y10T 24/45524: including resiliently biased projection component or surface segment
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention relates to a one-piece push-in type of fastener having side wings or fronds on a shank and adapted to prevent withdrawal of the fastener when inserted into a hole in which the shank is of H-shape in cross-section with wings or fronds on opposite plane surfaces of the shank and with the front surface of each wing or frond curved at its inner end to lead to the inner end of the rear surface of the next adjacent wing or frond.

## Claims

### Claim 1

A reusable fastener of the one-piece push-in type having a longitudinal axis and laterally extending fronds on a shank to inhibit withdrawal of the fastener shank when inserted into a preformed hole, said fastener shank being generally H-shape in cross-section with opposite side faces and adapted to fit neatly within a hole into which the fastener is to be fitted, a plurality of axially spaced fronds on each said opposite side face of the shank to form two rows of fronds in opposed relationship, said fronds being resilient and adapted to engage the inner wall of said hole to resist withdrawal of the fastener therefrom, a head at one end of the shank, whereby when said fastener is positioned in said hole said H-shape shank centrally locates said longitudinal axis of said fastener relative to the central axis of said hole thereby insuring engagement of both rows of fronds with said inner wall of said hole.

### Claim 2 (depends on 1)

A fastener, as defined in claim 1, wherein said head is domed shaped and has a lateral extent greater than the lateral extent of said fronds.

### Claim 3 (depends on 1)

A fastener, as defined in claim 1, wherein said shank having laterally extending fronds thereon has a greater lateral extent than the hole.

### Claim 4 (depends on 1)

A fastener, as defined in claim 1, having a tapered nose at the end of the shank opposite said head.

### Claim 5

A reusable fastener of the one-piece push-in type having a longitudinal axis and laterally extending fronds on a shank to inhibit withdrawal of the fastener shank when inserted into a preformed hole, said fastener shank formed with two faces on opposite sides thereof and adapted to fit neatly within a hole into which the fastener is to be fitted, a plurality of axially spaced fronds on each said face, a head at one end of the shank, each frond having a rear surface facing said head substantially normal to the longitudinal axis of the shank and a front surface inclined relative to the shank, the front surface of each frond curved at its inner end to lead to the inner end of the rear surface of the next adjacent frond said fronds being resilient and adapted to engage the inner wall of said hole to resist withdrawal of the fastener therefrom, whereby when said fastener is positioned in said hole said shank centrally locates said longitudinal axis of said fastener relative to the central axis of said hole thereby insuring engagement of fronds on both faces with said inner wall of said hole.

### Claim 6 (depends on 5)

A fastener, as defined in claim 5, wherein said head is dome shaped and has a lateral extent greater than the lateral extent of said fronds.

### Claim 7 (depends on 5)

A fastener, as defined in claim 5, wherein said shank having laterally extending fronds thereon has a greater lateral extent than the hole.

### Claim 8 (depends on 5)

A fastener, as defined in claim 5, having a tapered nose at the end of the shank opposite said head.