Structure for detachable front loader, detachable front loader, and work vehicle

Patent metadata

Field	Value
Publication number	US-11193252-B2
Application number	US-202016838440-A
Country	US
Kind code	B2
Filing date	Apr 2, 2020
Priority date	Apr 24, 2019
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

A structure of a detachable front loader includes: a main frame; a boom; and a subframe unit that supports the boom. The subframe unit includes: a subframe; a guide that is disposed on the subframe and engages with the main frame; a lock bar that includes a pivot shaft disposed on the subframe, and a pivot shaft part; an operation tool that moves the lock bar from the restriction position to the release position against a first biasing force; and a locking tool that is supported by the subframe, moves between a locking position and an unlocking position, is biased in a locking direction, and once the operation tool moves the lock bar to the release position, moves to the locking position by a second biasing force, and engages with a cutout formed in the pivot shaft part.

First claim

What is claimed is:

1. A structure of a detachable front loader for a vehicle body, the structure comprising:
a main frame disposed on the vehicle body;
a boom; and
a subframe unit that supports the boom, wherein
the subframe unit comprises:
a subframe;
a guide that is disposed on the subframe and engages with the main frame;
a lock bar that:
comprises:
a first pivot shaft disposed on the subframe; and
a pivot shaft part through which the first pivot shaft is inserted,

pivots around the first pivot shaft between a restriction position and a release position, wherein a movement of the main frame engaging with the guide is restricted by the lock bar at the restriction position and is released from the lock bar at the release position, and
is biased in a restriction direction oriented to the restriction position from the release position;

an operation tool that pivots the lock bar from the restriction position to the release position against a first biasing force; and
a locking tool that:
is supported by the subframe,
rotates around a second pivot shaft to move between a locking position and an unlocking position, wherein the locking tool at the locking position holds the lock bar at the release position, and the locking tool at the unlocking position releases the lock bar at the release position,
is biased in a locking direction oriented to the locking position from the unlocking position,
once the operation tool moves the lock bar to the release position, moves to the locking position by a second biasing force, engages with a cutout in the pivot shaft part, and holds the lock bar at the release position, and
has a recess part that contacts an outer peripheral surface of the lock bar and restricts the rotation of the locking tool without preventing the lock bar from rotating.

2. The structure of the detachable front loader according to claim 1 , wherein
once the main frame moves in a direction away from the guide, the locking tool moves from the locking position toward the unlocking position against the second biasing force, and disengages from the cutout to release the lock bar.

3. The structure of the detachable front loader according to claim 1 , wherein
once the locking tool at the unlocking position contacts the lock bar at the restriction position, the locking tool is restricted from moving to the locking position.

4. The structure of the detachable front loader according to claim 1 , wherein
the guide comprises:
a hook that restricts the main frame from moving in a vertical direction; and
a contact surface that contacts the main frame and restricts the main frame from moving forward, wherein

an opening of the hook is oriented backward in a forward and backward direction, and
the hook interposes, from the vertical direction, a pin on the main frame.

5. The structure of the detachable front loader according to claim 1 , wherein
the lock bar comprises:
a contact surface that contacts the main frame and restricts the main frame from moving; and
an insertion pin that receives a force from the operation tool; wherein

the pivot shaft part is disposed between the contact surface and the insertion pin.

6. The structure of the detachable front loader according to claim 5 , wherein
the operation tool;
is supported by the subframe;
moves between a first position and a second position, wherein the operation tool at the first position contacts the insertion pin of the lock bar at the restriction position, and the operation tool at the second position contacts the insertion pin of the lock bar at the release position;
is biased in a direction oriented to the first position from the second position; and
moves the lock bar from the restriction position to the release position by being operated to move from the first position to the second position against a third biasing force.

7. The structure of the detachable front loader according to claim 1 , wherein
once the main frame moves in a direction approaching the guide, the lock bar at the restriction position moves to an intermediate position between the restriction position and the release position against the first biasing force, and
once the main frame engages with the guide, the lock bar moves to the restriction position by the first biasing force, and restricts the main frame engaging with the guide from moving.

8. A detachable front loader comprising the structure according to claim 1 .

9. A work vehicle comprising the detachable front loader according to claim 8 .

10. The structure of the detachable front loader according to claim 2 , wherein
once the locking tool at the unlocking position contacts the lock bar at the restriction position, the locking tool is restricted from moving to the locking position.

11. The structure of the detachable front loader according to claim 2 , wherein
the guide comprises:
a hook that restricts the main frame from moving in a vertical direction; and
a contact surface that contacts the main frame and restricts the main frame from moving forward, wherein

an opening of the hook is oriented backward in a forward and backward direction, and
the hook interposes, from the vertical direction, a pin on the main frame.

12. The structure of the detachable front loader according to claim 3 , wherein
the guide comprises:
a hook that restricts the main frame from moving in a vertical direction; and
a contact surface that contacts the main frame and restricts the main frame from moving forward, wherein

an opening of the hook is oriented backward in a forward and backward direction, and
the hook interposes, from the vertical direction, a pin on the main frame.

13. The structure of the detachable front loader according to claim 2 , wherein
the lock bar comprises:
a contact surface that contacts the main frame and restricts the main frame from moving; and
an insertion pin that receives a force from the operation tool; wherein

the pivot shaft part is disposed between the contact surface and the insertion pin.

14. The structure of the detachable front loader according to claim 3 , wherein
the lock bar comprises:
a contact surface that contacts the main frame and restricts the main frame from moving; and
an insertion pin that receives a force from the operation tool; wherein

the pivot shaft part is disposed between the contact surface and the insertion pin.

15. The structure of the detachable front loader according to claim 4 , wherein
the lock bar comprises:
a contact surface that contacts the main frame and restricts the main frame from moving; and
an insertion pin that receives a force from the operation tool; wherein

the pivot shaft part is disposed between the contact surface and the insertion pin.

16. The structure of the detachable front loader according to claim 2 , wherein
once the main frame moves in a direction approaching the guide, the lock bar at the restriction position moves to an intermediate position between the restriction position and the release position against the first biasing force, and
once the main frame engages with the guide, the lock bar moves to the restriction position by the first biasing force, and restricts the main frame engaging with the guide from moving.

17. The structure of the detachable front loader according to claim 3 , wherein
once the main frame moves in a direction approaching the guide, the lock bar at the restriction position moves to an intermediate position between the restriction position and the release position against the first biasing force, and

Assignees

• Kubota Kk

Inventors

• Torii Shin

Classifications

• B62D49/02

  modified to take lifting devices · CPC title

• A01B59/064

  for connection to the front of the tractor · CPC title

• E02F3/627 Primary

  Devices to connect beams or arms to tractors or similar self-propelled machines, {e.g. drives therefor (connection of beams or booms or arms to the frame per se E02F3/382; connection of scraper bowls to the vehicle main body E02F3/653; connecting devices for agriculture tractors A01B59/06)} · CPC title

• A01D87/0053

  Tractor-mounted loaders (buck-rakes, transporting rakes A01D87/08; manure loaders A01C3/04; fork loaders, fork lifts B66F; earth-moving machines E02F) · CPC title

• E02F3/34

  with bucket-arms {, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms (with a single arm E02F3/283)} directly pivoted on the frames of tractors or self-propelled machines · CPC title