# US 5,342,157 A · Impact-type expansible plug for anchoring in a cylindrical drilled hole

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- Number: US 5,342,157 A
- Document ID: US5342157A
- Status: Granted
- Kind: A
- Application number: 08/089,768
- Filed: 1993-07-09
- Granted: 1994-08-30
- Earliest claimed: 1992-08-06
- Assignees: fischerwerke Artur Fischer GmbH & Co. KG
- Inventors: Artur Fischer
- Web page: https://patentgrep.com/patent/US5342157A

## CPC

- F16B 13/12: Separate metal {or non-separate or non-metal} dowel sleeves fastened by inserting the screw, nail or the like {(F16B13/0808 takes precedence)}
- F16B 13/126: {fastened by inserting an unthreaded element, e.g. pin or nail (F16B13/122, F16B13/128 take precedence)}
- Y10S 411/908: Resinous material
- 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

## Abstract

An impact-type expansible plug for anchoring in a cylindrical drilled hole of a concrete part and the like has an expansion sleeve provided with at least one longitudinal slot and expandable in a drilled hole, and also has an expansion sleeve with a conically narrowing internal bore, and an expansion mandrel drivable into the conically narrowing internal bore of the expansion sleeve. The expansion sleeve has a forward end provided with an annular collar having a radially directed circumferential cutting edge, and also has a portion tapering toward the annular collar.

## Claims

### Claim 1

An impact-type expansible plug for anchoring in a cylindrical drilled hole of a concrete part and the like, comprising an expansion sleeve provided with at least one longitudinal slot and expandable in a drilled hole, said expansion sleeve having a conically narrowing internal bore; and an expansion mandrel drivable into said conically narrowing internal bore of said expansion sleeve, said expansion sleeve having a forward end provided with an annular collar having a radially directed circumferential cutting edge, said expansion sleeve having a portion tapering toward said annular collar, said expansion mandrel having a conical extension which during an expanding process engages in said conically narrowing internal bore of said expansion sleeve, said conical extension having an outer surface which extends at a flatter angle relative to a central axis of said expansion mandrel than said conically narrowing internal bore of said expansion sleeve in an unexpanded state.

### Claim 2 (depends on 1)

An impact-type expansible plug as defined in claim 1, wherein said expansion sleeve has a conically tapering outer surface provided with at least one additional annular collar with a radially directed circumferential cutting edge.

### Claim 3 (depends on 1)

An impact-type expansible plug as defined in claim 1; and further comprising a shank having an outer diameter, said annular collar having a diameter corresponding to said outer diameter of said shank.

### Claim 4 (depends on 3)

An impact-type expansible plug as defined in claim 3, wherein said shank is connected with said expansion sleeve.

### Claim 5 (depends on 1)

An impact-type expansible plug as defined in claim 1, wherein said outer surface of said conical extension extends at an angle from 12.degree. to 14.degree., said conical internal bore having a wall extending at an angle of 15.degree. to 18.degree..

### Claim 6 (depends on 1)

An impact-type expansible plug as defined in claim 1, wherein said narrowing internal bore has a forward portion, said conical extension of said expansion mandrel at the beginning of and during an expanding operation being in contact with said forward portion of said narrowing internal bore.

### Claim 7 (depends on 1)

An impact-type expansible plug as defined in claim 1, wherein said expansion sleeve has an end face; and further comprising a spacer cap composed of a slidable material and arranged on said end face of said expansion sleeve, said spacer cap having a receiving chamber for said conical extension of said expansion sleeve so that said conical extension is driven into said receiving chamber and said expansion sleeve is expanded.

### Claim 8 (depends on 7)

An impact-type expansible plug as defined in claim 7, wherein said spacer cap is composed of a plastic material.