Abstract: Provided is an attitude maintenance mechanism of a front loader capable of improving visibility. An attitude maintenance mechanism of a front loader that maintains an attitude of a bucket coupled to a boom by operating according to rocking of the boom including a pair of left and right boom frames includes a first link member rockable with respect to a side frame of the front loader and a second link member rockably provided with respect to the boom frames and coupled to the first link member and a bucket cylinder, and the first link member and the second link member are provided as a left and right pair with each of the boom frames interposed therebetween.

Abstract: A front loader is attached to a car body and includes: a boom; a mainframe fixed to the car body; and a subframe that is detachably attached to the mainframe and supports the boom. The subframe includes: a first engaging portion that engages with the mainframe, and a second engaging portion that engages with the mainframe at a different position from the first engaging portion. Both the first engaging portion and the second engaging portion are formed in an attachment member that is integrally formed and that constitutes at least a portion of the subframe.

Abstract: A working tool mounting mechanism for a tractor, includes: an extensible cylinder that is disposed on a tip of a boom of a front loader of the tractor, and comprises a cylinder body and a rod slidable with respect to the cylinder body; engaging parts that are respectively disposed on the cylinder body and the rod, and are each movable between an engagement position and a release position with extension and contraction of the extensible cylinder, the engaging parts each engaging with a working tool detachably attached to the boom at the engagement position, and not engaging with the working tool at the release position; a cover that covers the extensible cylinder from one direction; and a frame that is fixed to the cover and restricts at least one of: movement of the cylinder body and the rod in an extensible direction exceeding a predetermined position with the extension and contraction of the extensible cylinder, and rotation of the extensible cylinder around an axial direction.

Abstract: A front loader is attached to a car body and includes: a boom; a mainframe fixed to the car body; and a subframe that is detachably attached to the mainframe and supports the boom. The subframe includes: a first engaging portion that engages with the mainframe, and a second engaging portion that engages with the mainframe at a different position from the first engaging portion. Both the first engaging portion and the second engaging portion are formed in an attachment member that is integrally formed and that constitutes at least a portion of the subframe.

Abstract: A readily attaching-detaching structure of a front loader that can make the attaching and detaching work to a vehicle body easier, a front loader, and a work vehicle. The attaching-detaching structure of a front loader is provided with a first retained member that is on either a main frame on a vehicle body or a sub-frame that supports a boom; a second retained member on the other of the main frame or the sub-frame; a first retaining member that retains the first retained member and is on the side opposite of the first retained member; a second retaining member that retains the second retained member and is on the side opposite to the second retained member; a first guiding member that guides the first retained member to the first retaining member when the sub-frame is mounted on the main frame; and a second guiding member that guides the second retained member to the second retaining member when the sub-frame is mounted on the main frame.

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.

Abstract: A readily attaching-detaching structure of a front loader that can make the attaching and detaching work to a vehicle body easier, a front loader, and a work vehicle. The attaching-detaching structure of a front loader is provided with a first retained member that is on either a main frame on a vehicle body or a sub-frame that supports a boom; a second retained member on the other of the main frame or the sub-frame; a first retaining member that retains the first retained member and is on the side opposite of the first retained member; a second retaining member that retains the second retained member and is on the side opposite to the second retained member; a first guiding member that guides the first retained member to the first retaining member when the sub-frame is mounted on the main frame; and a second guiding member that guides the second retained member to the second retaining member when the sub-frame is mounted on the main frame.

Abstract: An attaching-detaching structure of a front loader that can make the attaching and detaching work to a vehicle body easier, a front loader, and a work vehicle. The attaching-detaching structure of a front loader is provided with a thumb which, on a sub-frame that supports a boom, is supported so as to be able to move between an engagement position for engaging with a main frame provided on a vehicle body and a release position at which engagement with the main frame is released, and which is biased in the release direction toward the release position from the engagement position; and a lock bar which, on the sub-frame, is supported so as to be able to move between a regulated position for regulating movement of the thumb in the release direction from the engagement position, and a regulation release position that allows the thumb to move to the release position.

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.

Abstract: To provide a attaching-detaching structure of a front loader that can make the attaching and detaching work to a vehicle body easier, a front loader, and a work vehicle. The attaching-detaching structure of a front loader is provided with: a thumb which, on a sub-frame that supports a boom, is supported so as to be able to move between an engagement position for engaging with a main frame provided on a vehicle body and a release position at which engagement with the main frame is released, and which is biased in the release direction toward the release position from the engagement position; and a lock bar which, on the sub-frame, is supported so as to be able to move between a regulated position for regulating movement of the thumb in the release direction from the engagement position, and a regulation release position that allows the thumb to move to the release position.