Expansion dowel bushing with a compressible section
AssigneeSociete De Prospection Et D'Inventions Techniques Spit
InventorClaire Rouger
Life of this patent
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Abstract
The dowel's expansion bushing (2) is placed around a threaded rod (9) inserted in the bushing's (2) expansion core (3), between the strut (8) and the core (3). The bushing (2) includes a section (16) compressible along its centerline, which includes a shearing system (24) placed such that, after shearing, the bushing (2) is shortened along its centerline. The bushing also includes, on its section (25) next to the strut (8), coupling and axial holding spurs (50). The bushing (2) is composed of a cut sheet metal blank, rolled on itself, except for the part with the spurs (50).
Claims20
An expansion dowel bushing for use with a threaded rod and a matching threaded core, said bushing being adapted to be located on the threaded rod between a head of the threaded rod and the threaded core, wherein
- said bushing is an at least partially rolled up, cut-out, unitary piece of sheet material comprising an axially compressible sleeve portion including a shearable portion which allows said axially compressible sleeve portion to be axially shortened after shearing axially compressible sleeve portion, at said shearable portion, into two pieces and axially compressing said two pieces toward each other upon the threaded core being rotated with respect to the threaded rod so as to move axially toward the head of the threaded rod.
An anchor, comprising:
- a threaded rod having a head and a matching threaded core;
- and
- a bushing located on the threaded rod between said head and the threaded core, wherein
- said bushing is an at least partially rolled up, cut-out, unitary piece of sheet material comprising an axially compressible sleeve portion including a shearable portion which allows said axially compressible sleeve portion to be axially shortened after shearing axially compressible sleeve portion, at said shearable portion, into two pieces and axially compressing said two pieces toward each other upon the threaded core being rotated with respect to the threaded rod so as to move axially toward the head of the threaded rod.
An expansion dowel bushing for use with a threaded rod and a matching threaded core, said bushing being adapted to be located on the threaded rod between a head of the threaded rod and the threaded core, wherein
- said bushing is made from a cut-out, unitary piece of sheet material by partially rolling up said cut-out, unitary piece of sheet material to have a generally cylindrical shape, except predetermined portions of said cut-out, unitary piece of sheet material which are not rolled up and therefore remain generally flat;
- and
- said predetermined portions are links connecting two rolled up portions of said cut-out, unitary piece of sheet material, said links being shearable to allow said bushing to be axially shortened alter shearing said links and axially compressing said two rolled up portions toward each other upon the threaded core being rotated with respect to the threaded rod so as to move axially toward the head of the threaded rod.
Dependencies are inferred from the claim text.