# US 10,370,819 B2 · Front loader and working vehicle with forwardly located coupling shaft

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- Number: US 10,370,819 B2
- Document ID: US10370819B2
- Status: Granted
- Kind: B2
- Application number: 16/010,943
- Filed: 2018-06-18
- Published: 2019-06-27
- Granted: 2019-08-06
- Earliest claimed: 2017-12-27
- Assignees: Kubota Corporation
- Applicants: Kubota Corporation
- Inventors: Robert Stewart Boyd
- Web page: https://patentgrep.com/patent/US10370819B2

## CPC

- E02F 3/6273: {using legs to support the beams or arms on the ground during the connecting process}
- E02F 3/34: 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
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)

## Abstract

A link operating mechanism is provided spanning a bucket and a stand. The link operating mechanism causes, using a swing force of the bucket, a bending or stretching link to bend so that propping and supporting of the bending or stretching link are released.

## Claims

### Claim 1

A front loader comprising:
a boom configured to be removably coupled to a vehicle body;
a bucket supported at a front end of the boom;
a stand configured to support the boom, when removed from the vehicle body, in a state in which the bucket is engaged on the ground;
a bending or stretching link that is provided spanning the boom and the stand, and is configured to prop and support the stand in a state in which the stand is engaged on the ground; and
a link operating mechanism that is provided spanning the bucket and the stand, and is configured to cause, using a swing force of the bucket, the bending or stretching link to bend so that the propping and supporting of the bending or stretching link are released,
wherein
the stand is configured to be raised and lowered between a lowered and used position at which the stand is lowered with respect to the boom and supports the boom, and a raised and stored position at which the stand is raised with respect to the boom,
the bending or stretching link includes: a boom-side arm swingably supported by the boom; a stand-side arm swingably coupled to the stand; and a coupling shaft for connecting a free end portion of the boom-side arm and a free end portion of the stand-side arm so as to be relatively swingable, whereby the bending or stretching link is switchable between a bent state in which the stand is brought to the raised and stored position and a stretched state in which the stand is brought to the lowered and used position, and
when the bending or stretching link is in the bent state, the coupling shaft is located forward of a pivot point of the boom-side arm with respect to the boom, and the coupling shaft is located forward of a pivot point of the stand-side arm with respect to the stand.

### Claim 2 (depends on 1)

The front loader according to claim 1, wherein when the bending or stretching link is in the stretched state, an axis of the coupling shaft is located rearward of a straight line that connects the pivot point of the boom-side arm and the pivot point of the stand-side arm.

### Claim 3 (depends on 1)

The front loader according to claim 1, wherein when the bending or stretching link is in the bent state, an axis of the coupling shaft is located upward of an upper rim of a part of the boom which part is on a boom top end side relative to the pivot point of the boom-sided arm.

### Claim 4 (depends on 1)

The front loader according to claim 1, wherein the stand and the bending or stretching link are located on an inner side in the lateral direction of the vehicle body relative to the boom.

### Claim 5

A working vehicle including a vehicle body and a front loader supported by the vehicle body,
the front loader comprising:
a boom configured to be removably coupled to a vehicle body;
a bucket supported at a front end of the boom;
a stand configured to support the boom, when removed from the vehicle body, in a state in which the bucket is engaged on the ground;
a bending or stretching link that is provided spanning the boom and the stand, and is configured to prop and support the stand in a state in which the stand is engaged on the ground; and
a link operating mechanism that is provided spanning the bucket and the stand, and is configured to cause, using a swing force of the bucket, the bending or stretching link to bend so that the propping and supporting of the bending or stretching link are released,
wherein
the stand is configured to be raised and lowered between a lowered and used position at which the stand is lowered with respect to the boom and supports the boom, and a raised and stored position at which the stand is raised with respect to the boom,
the bending or stretching link includes: a boom-side arm swingably supported by the boom; a stand-side arm swingably coupled to the stand; and a coupling shaft for connecting a free end portion of the boom-side arm and a free end portion of the stand-side arm so as to be relatively swingable, whereby the bending or stretching link is switchable between a bent state in which the stand is brought to the raised and stored position and a stretched state in which the stand is brought to the lowered and used position, and
when the bending or stretching link is in the bent state, the coupling shaft is located forward of a pivot point of the boom-side arm with respect to the boom, and the coupling shaft is located forward of pivot point of the stand-side arm with respect to the stand.