Telescoping boom with rotary extension and locking system

Patent metadata

Field	Value
Publication number	US-11117789-B2
Application number	US-201916429751-A
Country	US
Kind code	B2
Filing date	Jun 3, 2019
Priority date	Jun 4, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A telescoping boom includes a boom actuator having a fixed part and a movable part, the movable part configured to move along a length the fixed part, a rotary actuator operably connected to the movable part and configured to rotate relative to the movable part, a coupling pin connected to and configured to rotate with the rotary actuator, and a telescoping boom having a plurality of boom sections including a base section and one or more telescoping sections configured for telescoping movement along a longitudinal boom axis relative to the base section. A rotary extension and locking system is mounted on at least one telescoping section and is configured for selective coupling to the boom actuator and selective locking with a nearest outwardly adjacent boom section.

First claim

What is claimed is:

1. A telescoping boom comprising:
a boom actuator having a fixed part and a movable part;
a rotary actuator operably connected to the movable part and rotatable relative thereto;
a coupling pin connected to and configured to rotate with the rotary actuator;
a plurality of boom sections including a base section and one or more telescoping sections configured for telescoping movement along a longitudinal boom axis relative to the base section; and
a rotary extension and locking system mounted to at least one telescoping section of the one or more telescoping sections, the rotary extension and locking system configured for selective coupling to the boom actuator and selective locking with a nearest outwardly adjacent boom section, wherein the rotary extension and locking system comprises:
a coupling ring rotatably mounted on the at least one telescoping section;
a section pin operably connected to the coupling ring; and
a latch configured to selectively engage the section pin.

2. The telescoping boom of claim 1 , further comprising:
a coupling ring spring operably coupled between the at least one telescoping section and the coupling ring to urge the coupling ring to rotate in a predetermined direction;
a section pin spring operably connected between the at least one telescoping section and the section pin to urge the section pin to move toward a first position; and
a latch spring operably coupled between the at least one telescoping section and the latch to urge the latch in a direction toward the section pin.

3. The telescoping boom of claim 1 , wherein the coupling pin engages the coupling ring in response to rotation of the rotary actuator in a first direction.

4. The telescoping boom of claim 3 , wherein the coupling ring is rotated in the first direction to move the section pin from a first position to a second position in response to further rotation of the rotary actuator and the coupling pin in the first direction.

5. The telescoping boom of claim 4 , wherein the latch selectively engages the section pin to hold the section pin in the second position.

6. The telescoping boom of claim 5 , wherein the latch is moved into engagement with the section pin under a spring force from a latch spring.

7. The telescoping boom of claim 5 , wherein the coupling ring disengages from the section pin in response to further rotation of the coupling ring in the first direction.

8. The telescoping boom of claim 7 , wherein the coupling ring further comprises a lug, and the lug moves the latch out of engagement with the section pin in response to further rotation of the coupling ring in the first direction.

9. The telescoping boom of claim 8 , wherein the section pin moves from the second position to the first position under a spring force of a section pin spring.

10. The telescoping boom of claim 9 , wherein the coupling ring rotates in a second direction to a START position.

11. The telescoping boom of claim 10 , wherein the section pin comprises a spring loaded arm and the coupling ring deflects the spring loaded arm during rotation in the second direction.

12. The telescoping boom of claim 10 , wherein the coupling ring rotates in the second direction under a spring force from a coupling ring spring.

13. The telescoping boom of claim 10 , wherein the coupling pin disengages the coupling ring in response to rotation of the rotary actuator in the second direction relative to the coupling ring.

14. The telescoping boom of claim 1 , wherein the coupling ring comprises a coupling slot in which the coupling pin engages the coupling ring.

15. The telescoping boom of claim 1 , wherein the section pin further comprises an interlock pin configured to selectively engage the rotary actuator.

16. The telescoping boom of claim 1 , wherein the rotary actuator carries out a coupling operation by rotating the coupling pin into engagement with the coupling ring and carries out a section unlocking operation by rotating the coupling ring to move the section pin to the second position.

17. A telescoping boom section comprising:
an elongated section body having an end face; and
a rotary extension and locking system comprising:
a coupling ring rotatably mounted on the end face and configured to receive a coupling pin;
a section pin operably connected to the coupling ring; and
a latch mounted on the end face and configured to selectively engage the section pin,

wherein the coupling ring is configured to rotate relative to the end face in a first direction,
wherein the section pin is configured to move relative to the end face from a first position to a second position in response to rotation of the coupling ring in the first direction, and
wherein the latch is configured to engage the section pin to hold the section pin in the second position.

18. The rotary extension and locking system of claim 17 , wherein the latch is moved out of engagement with the section pin in response to further rotation of the coupling ring in the first direction.

Assignees

• Manitowoc Crane Companies Llc

Inventors

• Schoonmaker Stephen J

Classifications

• B66C2700/0371

  on a turntable · CPC title

• B66C23/708 Primary

  locking devices for telescopic jibs · CPC title

• B66C23/36

  mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes (with pneumatic or hydraulic motors B66C23/54; vehicle or ship aspects B60 - B63) · CPC title

• B66C23/701

  telescopic · CPC title

• B66C23/705

  telescoped by hydraulic jacks · CPC title