Rotation Limiter
First Claim
1. An apparatus limiting the arc of rotation of an axially elongated rod about its longitudinal axis in either of opposite rotational directions, comprising:
- an adjustable stop assembly, useable with an axially elongated rod that is rotatable about its longitudinal axis, mountable for rotation with the rod, and establishing a stop assembly pathway about the longitudinal axis of the rod;
first and second pivot arms, juxtaposed to said stop assembly, positioned with either one of said pivot arms extending into an interference position with said stop assembly pathway such that the adjustable stop assembly will strike the interfering pivot arm in one of the opposite rotational directions, and positioned with the other pivot arm displaced from the interference position; and
a mechanism for linking the first and second pivot arms for common movement and moving either pivot arm into the interference position when the other pivot arm exits the interference position;
wherein, when in the interference position, each pivot arm is positioned to respond to being struck by said stop assembly from a one of the rotational directions by braking the stop assembly and to respond to being struck by the stop assembly from the opposite rotational direction by exiting the interference position;
wherein the first and second pivot arms respond mutually oppositely to being struck in the respective opposite rotational directions; and
whereby the arc of rotation of the rod about its longitudinal axis in one of the rotational directions is limited by one of the pivot arms braking the stop assembly in response to the stop assembly striking the pivot arm in the one rotational direction.
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Accused Products
Abstract
Adjustable stops are mounted on a rotating rod, and one pivot arm of a linked pair extends into an interference position such that one stop will strike it. The linkage draws the second arm into interference position if the first arm is displaced from it. Each pivot arm will brake the stop if struck from one direction and will be displaced, drawing in the other pivot arm, if struck from the opposite direction. The pivot arms react oppositely to being struck from each respective direction of rotation. Thus, continued rotation of the rod in one direction results in a stop striking a pivot arm suitably to brake the stop, with the permitted arc of rotation determined by relative adjustment of the stops.
12 Citations
25 Claims
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1. An apparatus limiting the arc of rotation of an axially elongated rod about its longitudinal axis in either of opposite rotational directions, comprising:
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an adjustable stop assembly, useable with an axially elongated rod that is rotatable about its longitudinal axis, mountable for rotation with the rod, and establishing a stop assembly pathway about the longitudinal axis of the rod;
first and second pivot arms, juxtaposed to said stop assembly, positioned with either one of said pivot arms extending into an interference position with said stop assembly pathway such that the adjustable stop assembly will strike the interfering pivot arm in one of the opposite rotational directions, and positioned with the other pivot arm displaced from the interference position; and
a mechanism for linking the first and second pivot arms for common movement and moving either pivot arm into the interference position when the other pivot arm exits the interference position;
wherein, when in the interference position, each pivot arm is positioned to respond to being struck by said stop assembly from a one of the rotational directions by braking the stop assembly and to respond to being struck by the stop assembly from the opposite rotational direction by exiting the interference position;
wherein the first and second pivot arms respond mutually oppositely to being struck in the respective opposite rotational directions; and
whereby the arc of rotation of the rod about its longitudinal axis in one of the rotational directions is limited by one of the pivot arms braking the stop assembly in response to the stop assembly striking the pivot arm in the one rotational direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a vehicle having an axially elongated steering shaft that is rotatable about its longitudinal axis, an apparatus selectively limiting the available arc of rotation of the steering shaft about its longitudinal axis, comprising:
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a variably positionable and variably sizeable stop assembly carried on said steering shaft, establishing a stop assembly pathway about the longitudinal axis of the steering shaft through which the stop assembly is moveable with rotation of the steering shaft in opposite first and second rotational directions;
first and second pivot arms variably positioned such that either selected pivot arm is in the stop assembly pathway and the other pivot arm is displaced from the stop assembly pathway; and
a linking mechanism between the first and second pivot arms, responding to either pivot arm being displaced from the stop assembly pathway by moving the other pivot arm into the stop assembly pathway;
wherein the first pivot arm is structured such that if the stop assembly strikes the first pivot arm in the stop assembly pathway in the first direction of rotation, the stop assembly engages the first pivot arm in a braking relationship, and if the stop assembly strikes the first pivot arm in the second direction of rotation, the stop assembly displaces the first pivot arm from the stop assembly pathway; and
wherein the second pivot arm is structured such that if the stop assembly strikes the second pivot arm in the stop assembly pathway in the second direction of rotation, the stop assembly engages the second pivot arm in a braking relationship, and if the stop assembly strikes the second pivot arm in the first direction of rotation, the stop assembly displaces the second pivot arm from the stop assembly pathway;
whereby the rotation of the steering shaft about its longitudinal axis in one of the two rotational directions is limited by the stop assembly engaging at least one of the two pivot arms in a braking relationship. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for limiting the arc of rotation of an axially elongated rod about its longitudinal axis, comprising:
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first, mounting a pair of stops on an axially elongated rod that is rotatable about its longitudinal axis, thereby establishing a stop pathway occupied by said pair of stop during rotation of the rod;
second, mounting a pair of first and second pivot arms in a position juxtaposed to the pair of stops, wherein the pivot arms are linked to be alternately pivotable into and out of an interference position with the stop pathway, and wherein the pair of pivot arms is positioned such that;
(a) the first pivot arm brakes the rod when one of the stops strikes the first pivot arm in a first rotational direction;
(b) the second pivot arm brakes the rod when one of the stops strikes the second pivot arm in a second rotational direction;
(c) the first pivot arm is displaced out of said interference position and the second pivot arm is moved into the interference position when one of said stops strikes the first pivot arm in said second rotational direction; and
(d) the second pivot arm is displaced out of said interference position and the first pivot arm is moved into the interference position when one of said stops strikes the second pivot arm in said first rotational direction;
third, positioning a selected one of the first and second pivot arms in the interference position; and
fourth, rotating the rod in a direction selected from the first and second rotational directions until one of the stops strikes one of the pivot arms in a direction such that the pivot arm brakes the rod, thus limiting the arc of rotation of the rod.
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Specification