Excavator arm
AssigneeKarl Schaeff GmbH & Co.
InventorHans Schaeff
Life of this patent
Estimating the term…
Abstract
An excavator arm with basic boom 12, intermediate boom 14 and shovel stem 16 with digging implement is connected to a support part 86 which can be driven directly or indirectly into rotation about a vertical axis 84. In order to dig trenches with vertical walls outside the longitudinal axis of the vehicle and to achieve an advantageous transport position, the intermediate boom 14 consists of a front part 14a, a rear part 14b and a common rotary joint 20, the most advantageous transport position being achieved by rotating by 180.degree. the front part 14a, about the axis of rotation 22 set vertically, from the extended operational position relative to the rear part 14b.
Claims11
A three-part excavator arm, comprising:
- a) a basic boom, an intermediate boom, and a shovel stem pivotally connected to each other about horizontal pivot axes and pivotally connected by said basic boom to an excavator base, which is rotatable about a vertical axis;
- b) said intermediate boom having a front part, a rear part, and a common rotary joint having an axis of rotation;
- c) actuating means for operating and adjusting said axis of rotation into vertical orientation;
- d) said common rotary joint allows mutual endless rotation between the front part and the rear part of said intermediate boom;
- e) said front part and said rear part being axially offset along the axis of rotation of said rotary joint to afford unrestricted relative rotational movement between both of said parts;
- and,
- f) locking means for locking said front part and said rear part at mutually straightened positions, at a position pointing in the same direction from the rotary joint and at intermediate positions.
Dependencies are inferred from the claim text.