REMOVABLE CONCAVE FOR AN AXIAL FLOW-TYPE COMBINE AND ADJUSTING MEANS THEREFOR

• US 3,871,384 A
• Filed: 06/29/1973
• Issued: 03/18/1975
• Est. Priority Date: 06/29/1973
• Status: Expired due to Term

• Current Assignee: Case Corporation (CNH Industrial N.V.)
• Original Assignee: Richard A. Depauw, Robert W. Hawkins
• Inventors: Depauw, Richard A., Hawkins, Robert W.
• Primary Examiner(s): Mancene, Louis G.
• Assistant Examiner(s): Eskovitz, J. N.
• Application Number:
  US05/375,250
• Time in Patent Office: 627 Days
• Field of Search: 130/27T,27R,27L
• US Class Current: 460/109
• CPC Class Codes: A01F 12/20 Threshing cylinders with ribs

Abstract

A removable concave for the cylindrical rotor casing of an axial flow-type combine wherein the concave is held in an operative raised position within the rotor casing by means of a slide-out carrier upon which the concave rests and to which it is rigidly but removably secured. The carrier is suspended by an adjustable linkage, minor adjustments of which raise and lower the carrier to vary the effective position of the concave relative to the rotor casing axis. A terminal adjustment of the linkage, when accompanied by release of the carrier from the concave, lowers the concave to a position where the latter may be slid sidewise from the rotor casing and consequently from the combine. In its operative position in the rotor casing, the concave is circumferentially offset on one side of the vertical plane of the rotor casing axis to improve grain discharge.

Claims

1. An axial flow combine having a chassis, an elongated longitudinally extending medially disposed cylindrical rotor casing supported on said chassis and embodying an arcuate section in the lower region thereof in the form of a perforate concave which defines an axially extending threshing region, a rotor designed for threshing cooperation with the concave the rotatable about the longitudinal axis of the casing, means for unidirectionally driving said rotor, said concave being movable bodily toward and away from the rotor through small increments of movement to vary the cooperating threshing characterisitics of the rotor and concave, a carrier projecting transversely across said chassis beneath the concave and having its proximate end pivoted to the chassis at one side thereof for swinging movement about a horizontal axis, means fixedly securing said concave to the carrier for movement bodily in unison therewith, and adjustable means effective between the distal end of the carrier and the chassis on the other side of the latter for raising and lowering the carrier.

2. An axial flow combine as set forth in claim 1, wherein the medial region of said carrier makes tangential contact with the underneath side of the concave in supporting relationship, and the concave is secured to the carrier at the distal end of the latter.

3. An axial flow combine as set forth in claim 2, wherein said means for fixedly securing the concave to the carrier is releasable to the end that, when released, the carrier serves to slidably support the concave.

4. An axial flow combine as set forth in claim 1 wherein said adjustable means for raising and lowering the carrier comprises a substantially vertically extending link having its lower end pivoted to the carrier, a bell crank supported from the chassis and having a generally horizontally extending arm pivoted at its outer end to the upper end of said link, and a substantially vertically extending arm, and a worm drive mechanism mounted on the chassis and connected to the outer end of said vertical arm.

5. An axial flow combine as set forth in claim 4, wherein said worm drive mechanism including a control housing on the chassis, a horizontal worm shaft rotatably carried by said housing, a crosshead threadedly mounted on the worm shaft for linear travel therealong, and a floating link pivoted at its opposite ends to said crosshead and the vertically extending arm of said bell crank.

6. An axial flow combine as set forth in claim 5, wherein said housing is provided with a reaction web which is disposed adjacent to and is coextensive with the worm shaft, and the crosshead is provided with means establishing a groove into which said web projects.

7. An axial flow combine as set forth in claim 1, wherein the medial region of said carrier makes tangetial contact with the underneath side of the concave in supporting relationship, the means for fixedly securing the concave to the carrier is releasable to the end that, when such means is released the carrier serves to slidably support the concave, and the side of the concave which opposes the direction of rotation of the rotor projects loosely into a recess which is provided on the adjacent edge of the rotor casing.