Abstract First and second excavator bucket linkage embodiments each include first, second, third and fourth links. Each embodiment includes first and second links pivotally interconnected to each other and to the rod end of an extensible and retractable hydraulic actuator with the first link also being pivotally connected to the bucket. In the first embodiment, the third and fourth links are arranged in general parallelism with each other and have respective first ends pivotally connected to the second link and respective second ends pivotally connected to the dipper stick. In the second embodiment, the third link is pivotally connected between the dipper stick and the second link while the fourth link is pivotally interconnected between the third link and the bucket.
In an excavator dipper stick and bucket assembly wherein the bucket is pivotally connected to one end of the dipper stick for movement about a first axis, a bucket linkage connected between the dipper stick and the bucket, and an extensible and retractable hydraulic actuator connected between the dipper stick and the linkage for effecting pivotal movement of the bucket upon extension or retraction of the actuator, the improvement residing in the linkage and comprising: a first link having an end pivotally connected to the bucket for movement about a second axis which is parallel to and spaced from the first axis; a second link having an end pivotally connected to a second end of the first link and to an end of the actuator, a third link having its opposite ends pivotally connected to a second end of the second link and to the dipper stick at a location spaced from the first axis; and a fourth link having opposite ends respectively pivotally connected to the third link and the bucket.
Claim 2
Dependent Claim
172 words
In an excavator dipper stick and bucket assembly wherein the bucket is pivotally connected to one end of the dipper stick for movement about a first axis, a bucket linkage connected between the dipper stick and the bucket, and an extensible and retractable hydraulic actuator connected between the dipper stick and the linkage for effecting pivotal movement of the bucket upon extension or retraction of the actuator, the improvement residing in the linkage and comprising: a first link having an end pivotally connected to the bucket for movement about a second axis which is parallel to and spaced from the first axis; a second link having an end pivotally connected to a second end of the first link and to an end of the actuator, a third link having its opposite ends pivotally connected to a second end of the second link and to the dipper stick at a location spaced from the first axis; and a fourth link having opposite ends respectively pivotally connected to the third link and the bucket.