# US 8,784,023 B2 · Screw and method to identify the screw

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- Number: US 8,784,023 B2
- Document ID: US8784023B2
- Status: Granted
- Kind: B2
- Application number: 13/134,884
- Filed: 2011-06-20
- Published: 2011-12-29
- Granted: 2014-07-22
- Earliest claimed: 2010-06-23
- Assignees: Hilti Aktiengesellschaft
- Applicants: Jochen Kuntner; Peer Schmidt
- Inventors: Jochen Kuntner; Peer Schmidt
- Web page: https://patentgrep.com/patent/US8784023B2

## CPC

- F16B 31/02: for indicating {the attainment of a particular tensile load} or limiting tensile load {(apparatus for, or method of, determining value of torque or twisting moment for tightening a nut or other member similarly stressed G01L5/24)}
- B25B 23/14: Arrangement of torque limiters or torque indicators in wrenches or screwdrivers (couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L)
- F16B 35/06: Specially-shaped heads (special shape in order to rotate the bolt F16B23/00 {; separate hook adaptors for bolts F16B43/025})
- F16B 43/001: {for sealing or insulation}
- F16B 2200/95: with markings, colours, indicators or the like
- G01L 5/24: for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- 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)
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A screw has a head whose underside has impressions or embossings and faces towards the tip. The underside is divided into at least five sectors of the same size. Three-fifths of the sectors exhibit an identical pattern of impressions or embossings and at least one sector is provided with a different pattern of impressions or embossings or else with no impressions or embossings.

## Claims

### Claim 1

A screw comprising:
a head having an underside, the underside having impressions or embossings, the underside facing towards a screw tip and being divided into at least five sectors of the same size, at least three-fifths of the sectors exhibiting an identical pattern of the impressions or embossings and at least one sector is provided with a different pattern of the impressions embossings or else with no impressions or embossings;
wherein a first impression or embossing is closest to a second impression or embossing in one direction of rotation, and a third impression or embossing is closest to the second impression or embossing counter to the one direction of rotation, a first angle between the first impression or embossing and the second impression or embossing being different from a second angle between the second impression or embossing and the third impression or embossing, wherein the first angle is twice as large as the second angle.

### Claim 2 (depends on 1)

The screw as recited in claim 1 wherein the underside is divided into fifteen sectors at the maximum.

### Claim 3 (depends on 1)

The screw as recited in claim 1 wherein two of the impressions or embossings are at a distance from each other at a smallest angle, and each of the impressions or embossings nearest a first impression or embossing being at a distance that is an integral multiple of the smallest angle.

### Claim 4 (depends on 3)

The screw as recited in claim 3 wherein each of the impressions or embossings is at a distance from the other impressions or embossings in an integral multiple within the range from five to fifteen of the smallest angle.

### Claim 5 (depends on 1)

The screw as recited in claim 1 wherein a radial distance between the axis and the impressions or embossings, or at least a section of the impressions or embossings, is larger than two-sixths of the diameter of the screw head.

### Claim 6 (depends on 1)

The screw as recited in claim 1 wherein the impressions or embossings are ridges or ribs that run radially.

### Claim 7 (depends on 1)

The screw as recited in claim 1 wherein the screw is divided into five sectors of the same size.