Tamper-resistant bicycle axle nut
First Claim
1. A tamper-resistant bicycle axle nut comprising:
- a generally dome-shaped body, the body having;
a bottom surface;
a top surface;
a central axis;
a central bore along the central axis, the central bore extending at least part way through the body from the bottom surface toward the top surface; and
a curved outer peripheral wall extending circumferentially around the body, the curved outer peripheral wall having a recess therein;
the recess increasing in radial depth as it extends circumferentially in a first direction around the body;
the recess having;
a first and open-ended portion that is not bounded on a radially outer side by the outer peripheral wall of the body; and
a second and closed-ended portion in which the recess extends between the outer peripheral wall of the body and a curved inner wall, the closed-end portion being bounded on a radially inward side by the curved inner wall and bounded on a radially outward side by the curved outer wall to define a channel therebetween.
2 Assignments
0 Petitions
Accused Products
Abstract
A tamper-resistant fastener such as a nut for a bicycle has a smoothly rounded generally dome-shaped body and one or more recesses formed into the body. Each recess has a first and open ended portion which is bounded on radially inward side but not on the radially outward side, and a second and closed ended portion which is bounded on both the radially inward side and the radially outward side. Additionally, each recess can have an additional notch formed therein, the recess and notch together forming a major and minor recess. A wall which bounds the radially inward side of the recess decreases in radial distance from the central axis of the nut as the recess proceeds in the circumferential direction. A mating wrench has teeth that match the recesses and, if present, the notches.
29 Citations
20 Claims
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1. A tamper-resistant bicycle axle nut comprising:
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a generally dome-shaped body, the body having; a bottom surface; a top surface; a central axis; a central bore along the central axis, the central bore extending at least part way through the body from the bottom surface toward the top surface; and a curved outer peripheral wall extending circumferentially around the body, the curved outer peripheral wall having a recess therein; the recess increasing in radial depth as it extends circumferentially in a first direction around the body; the recess having; a first and open-ended portion that is not bounded on a radially outer side by the outer peripheral wall of the body; and a second and closed-ended portion in which the recess extends between the outer peripheral wall of the body and a curved inner wall, the closed-end portion being bounded on a radially inward side by the curved inner wall and bounded on a radially outward side by the curved outer wall to define a channel therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tamper-resistant bicycle axle nut comprising:
a generally dome-shaped body, the body having; a central axis therethrough; a threaded central bore disposed along the central axis; a generally smooth, rounded peripheral wall, the peripheral wall having a recess therein, the recess having at least a first part thereof that extends toward the central axis a greater distance than does a second part of the recess; and an inner wall that defines in part the recess; wherein; the inner wall has a notch therein; and the notch extends radially inwardly from the inner wall, the notch defining an acutely angled recess for mating with a correspondingly acutely angled tooth. - View Dependent Claims (11, 12, 13, 14)
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15. A tamper-resistant bicycle axle nut comprising:
a generally dome-shaped body, the body having; a central axis therethrough; a threaded central bore disposed along the central axis; and a smooth, rounded peripheral wall, the peripheral wall having a recess therein, the recess increasing in radial depth as it extends circumferentially in a first direction around the body, the recess defined in part by an inner wall that is located an increasingly smaller distance from the central axis as it extends in the first direction; the recess having; a first portion that is bounded on a radially inward side by the inner wall, and not bounded on an opposite and radially outward side; and a second portion that is bounded on a radially inward side by the inner wall, and is bounded on an opposite and radially outward side by an exterior wall to define a channel therebetween. - View Dependent Claims (16, 17, 18, 19, 20)
Specification