Bore serration for locking threaded inserts against rotation
First Claim
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1. A system for attaching a threaded fastener to a component comprising:
- a threaded insert having an external serration including a plurality of externally projecting teeth distributed around a circumference of the threaded insert, the threaded insert also having a threaded portion,a component having a bore for receiving the threaded insert, the bore having an arcuate serration including at least one inwardly facing arcuate recess positioned on an internal circumference of the bore, the at least one arcuate recess having at least one of a different size and shape as compared to the teeth of the threaded insert and being positioned and sized to receive and engage at least two teeth of the external serration of the threaded insert to lock the threaded insert against rotation with respect to the component when the threaded insert is positioned in the bore and to allow a threaded fastener to be engaged with the threaded portion of the threaded insert to attach the threaded fastener to the component.
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Abstract
A bore serration for locking externally serrated inserts (3) against rotation, with the external serration (4) comprising several teeth (5), and particularly for use with components made of hard, brittle materials, includes an arcuate serration (10) featuring arcuate recesses (7) produced by plunge or circumferential surface milling. Each of the recesses positively accommodates at least two teeth (5) of the outer serration (4) of the threaded insert (3). The arcuate serration can be produced with high dimensional accuracy without damaging the workpiece and with reduced wear of the tool, and ensures a long service-life of the threaded insert.
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Citations
22 Claims
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1. A system for attaching a threaded fastener to a component comprising:
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a threaded insert having an external serration including a plurality of externally projecting teeth distributed around a circumference of the threaded insert, the threaded insert also having a threaded portion, a component having a bore for receiving the threaded insert, the bore having an arcuate serration including at least one inwardly facing arcuate recess positioned on an internal circumference of the bore, the at least one arcuate recess having at least one of a different size and shape as compared to the teeth of the threaded insert and being positioned and sized to receive and engage at least two teeth of the external serration of the threaded insert to lock the threaded insert against rotation with respect to the component when the threaded insert is positioned in the bore and to allow a threaded fastener to be engaged with the threaded portion of the threaded insert to attach the threaded fastener to the component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for locking a threaded insert against rotation, comprising:
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providing a threaded insert with an external serration having a plurality of teeth, forming an arcuate serration in a bore of a component, the arcuate serration having a plurality of arcuate recesses produced by at least one of plunge and circumferential surface milling, such that each of the arcuate recesses is constructed and arranged to receive at least two teeth of the external serration of the threaded insert to lock the threaded insert against rotation with respect to the component when positioned in the bore. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification