Material reducing apparatus

• US 7,832,670 B2
• Filed: 04/26/2007
• Issued: 11/16/2010
• Est. Priority Date: 03/19/2004
• Status: Active Grant

• Current Assignee: Astec Industries Incorporated (Johnson Crushers International)
• Original Assignee: Astec Industries Incorporated (Johnson Crushers International)
• Inventors: Bittrolf, Glenn Ford, Peterson, Arnold N.
• Primary Examiner(s): Francis; Faye
• Application Number:
  US11/740,531
• Publication Number:
  US 20070241218A1
• Time in Patent Office: 1,300 Days
• Field of Search: 241/73, 241/32, 241/186.35, 241/186.4, 241/189.1, 241/285.3, 241/291
• US Class Current: 241/291
• CPC Class Codes: B02C 13/286 Feeding or discharge
• CPC Class Codes: B02C 13/31 Safety devices or measures
• CPC Class Codes: B02C 2013/28609 Discharge means
• CPC Class Codes: B02C 2013/28636 of conveyor belt type
• CPC Class Codes: B02C 2013/28663 using rollers

Abstract

Described herein is a material reducing apparatus including a bypass arm and a bypass control member for allowing reduction-resistant objects of a material to bypass the apparatus while avoiding interruption of the operation of the apparatus. Other embodiments may be described and claimed.

Claims

1. A materials reduction apparatus comprising:

a bypass arm configured to pivot between a closed position and a non-closed position to allow a reduction-resistant object of a material to bypass the apparatus; and

a bypass control member configured to move between a first position when the bypass arm is in a closed position and a second position when the bypass arm is in the non-closed position, the bypass control member including a first end configured to traverse an interface surface of an exterior wall of the bypass arm, and a second end engaging a resistance member configured to urge the first end against the bypass arm to move the bypass arm to the closed position.

2. The apparatus of claim 1, wherein the exterior wall of the bypass arm has a first portion and a second portion angularly disposed from the first portion.

3. The apparatus of claim 2, wherein the second portion is generally curved.

4. The apparatus of claim 3, wherein the exterior wall of the bypass arm is convexly curved relative to the first end of the bypass control member.

5. The apparatus of claim 4, wherein the convexly curved surface of the bypass arm provides a resistance force in the open position that is greater than a resistance force in the closed position.

6. The apparatus of claim 3, wherein the second portion has a non-constant radius of curvature.

7. The apparatus of claim 1, wherein the exterior wall of the bypass arm is generally flat.

8. The apparatus of claim 1, wherein the first end of the bypass control member comprises a roller configured to traverse the exterior wall of the bypass arm.

9. The apparatus of claim 1, wherein the resistance element is configured to resist movement of the bypass control member from the first position and the second position.

10. The apparatus of claim 9, wherein the resistance element comprises at least a selected one or more of an airbag, a spring, and an elastomer.

11. The apparatus of claim 9, wherein the resistance element urges the bypass control member to return to the first position and thereby to urge the bypass arm to pivot towards the closed position.

12. The apparatus of claim 9, wherein the resistance element is configured to provide resistance force in the open position that is greater than a resistance force in the closed position.

13. The apparatus of claim 1, wherein the bypass arm is pivotally coupled to a shaft, and wherein the apparatus further comprises a shear pin coupled to the shaft and adapted to shear when the bypass arm encounters the reduction-resistant object.

14. The apparatus of claim 1, wherein the bypass arm is pivotally coupled to a shaft, and wherein the apparatus further comprises a compression member coupled to the shaft to allow limited generally linear movement of the shaft.

15. The apparatus of claim 1, wherein the first end of the bypass control member is configured to roll on the interface surface of the exterior wall of the bypass arm.