# US 4,396,327 A · Screw capture

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- Number: US 4,396,327 A
- Document ID: US4396327A
- Status: Granted
- Kind: A
- Application number: 06/194,089
- Filed: 1980-10-06
- Granted: 1983-08-02
- Earliest claimed: 1979-10-17
- Assignees: ERNO Raumfahrttechnik GmbH
- Inventors: Manfred Menke
- Web page: https://patentgrep.com/patent/US4396327A

## CPC

- F16B 5/02: by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00)
- F16B 41/002: {Measures against loss of bolts, nuts or pins (devices for fastening nuts to surfaces F16B37/04)}
- Y10T 29/4984: Retaining clearance for motion between assembled parts
- Y10T 29/49945: by driven force fit
- 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

A screw is captured in an assembly of concentric sleeves, the inner one of which has a flange, and an outer workpiece is clamped between the flange and the outer sleeve. The outer workpiece has a sufficiently large, beveled bore to permit radial play of the assembly. The outer sleeve has a threaded inner flange at the other end; and the two sleeves are assembled in press fit.

## Claims

### Claim 1

A screw-fastening assembly, including a device for capturing a screw which fastens two parts together, comprising:
a first, outer sleeve having an axial end face for bearing against an outer surface of one of the two parts without being fastened thereto independently from said screw; and
a second, inner sleeve being press fit the outer sleeve and having an axially and radially extending flange for bearing against a surface portion of said one part opposite said outer surface and without being fastened thereto independently from the screw so that the screw, upon being inserted into the sleeves and threaded into the other one of the two parts, will be held by the outer sleeve, the outer sleeve having a radially inwardly extending flange with threads for threaded through-passing of the screw, the sleeves having dimensions for being permitted radial, lateral movement relative to said parts for centering the screw in relation to a bore hole in the said other part.

### Claim 2 (depends on 1)

A device as in claim 1, the flange being of beveled, conical configuration.

### Claim 3

A fastener assembly, comprising:
a first, outer sleeve having a cylindrical interior and a threaded inner flange on one end;
a second, inner sleeve having a cylindrical exterior dimensioned to press fit into the outer sleeve, having also a beveled flange extending axially and radially from the opposite end of the first sleeve when inserted therein; and
a screw having an unthreaded shank portion adjacent to an enlarged head which shank portion is of smaller diameter than that of the said inner flange and having a threaded portion at the other end, threadedly fitting said threaded inner flange but extending beyond the beveled flange when the head abuts the inner flange.

### Claim 4 (depends on 1, 3)

A device as in claim 1 or 3, the outer sleeve having a conical outer contour.