JP2007278011A - Opening holding structure of door of cab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an opening holding structure installed on the outside of a cab body and capable of so holding the door of a cab at the opened position as to be released from interfering the opening and closing of the hood of a device adjacent to the cab. <P>SOLUTION: This opening holding structure 24 comprises a bracket 26 so installed on the cab body 14a to which the door 22 is fitted as to be inverted, a securing means 28 for so securing the bracket 26 to the "standing position" as to be released, and a holding member 30 fitted to the bracket 26 engaged with the door in the opened state when the bracket is at the "standing position" and holding the opened state of the door. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an open holding structure for releasably holding a cab door of a work machine or the like in an open state.

For example, work machines such as a wheel loader and a hydraulic excavator are provided with an open holding structure that freely holds the cab door on the side surface of the cab in a state where the cab door is opened almost 180 °. By keeping the door fully open, it is possible to secure a wider working field of view without projecting the door to the side of the work machine, or to open the cab to fresh outside air for work. (For example, refer to Patent Document 1).

The open holding structure is provided with a striker on either the side of the cab or the door, and on the other side is provided with a catch for releasably receiving the striker.

When most of the side of the cab is occupied by a door, for example, when a large door is provided or when a wide two-seater cab is provided, a striker or catch cannot be installed on the side of the cab. In this case, one of the open holding structures is provided on the side surface of the engine room or the like adjacent to the cab.
JP 2000-160599 A (FIG. 1)

The cab door opening and holding structure as described above has the following problems to be solved.

In other words, when the door open holding structure cannot be installed on the side of the cab and there is no engine room or the like in which the open holding structure is installed in the immediate vicinity of the opened door, either the striker or the catch of the open holding structure Installed on a bracket that protrudes from the main body, engine compartment, etc. However, this bracket interferes with the opening and closing of the hood in the engine compartment, and there is a problem that it is difficult to open and close the hood.

The present invention has been made in view of the above-mentioned facts, and its technical problem is that an open holding structure installed on the outside of the cab body that holds the door of the cab releasably in an open position is adjacent to the cab. It is an object of the present invention to provide an open holding structure for a cab door that can prevent the hood of a device from being opened and closed.

According to the present invention, as an open holding structure of a cab door that solves the above technical problems, a bracket that can be inverted upside down on a cab body to which the door is attached, and a bracket that can be released to an “standing position”. A cab door opening characterized by comprising: a fixing means for fixing; and a holding member attached to the bracket for engaging the open door in the bracket "standing position" and holding the open door. A retaining structure is provided.

Preferably, the bracket is attached to the cab main body by a hinge so as to be inverted. In addition, the bracket is installed so that it can be turned upside down in the door opening / closing direction, and is lowered in the door closing direction. Furthermore, the bracket includes a locking portion that comes into contact with and separates from the cab body and locks the movement of the door in the opening direction.

The fixing means includes a pin that is attached to the bracket and can be freely moved back and forth, and a pin hole that is provided in the cab main body and through which a tip end portion of the pin is inserted and removed. The pin is biased in the direction of the pin hole.

The open door holding structure of the cab constructed according to the present invention includes a bracket that is attached to the cab body so as to be inverted, a fixing means for releasably fixing the bracket to the “standing position”, and a bracket “standing position”. The holding member attached to the bracket which engages with the door in the open state and holds the open state of the door is provided.

Therefore, when the door is held in the open position, the bracket is set to the “standing position” and fixed to the position by the fixing means, the holding member is engaged with the door, and the door is held in the open position. When opening and closing the hood etc. of the device adjacent to the cab, release the engagement between the door and the holding member, release the fixing means, and tilt the bracket to the “down position” so as not to obstruct the opening and closing of the hood etc. Can be.

DESCRIPTION OF EMBODIMENTS Hereinafter, a cab door opening and holding structure configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a wheel loader which is a typical work machine.

This will be described with reference to FIG. In the wheel loader indicated by No. 2, a front vehicle body 6 having left and right front wheels 4 and 4 and a rear vehicle body 10 having left and right rear wheels 8 and 8 are connected to each other around an axis 12 so that the refraction steering can be freely performed. Has been. The rear vehicle body 10 includes a cab 14 on the front vehicle body 6 side and an engine chamber 16 adjacent to the rear vehicle body 10. A snow plow 20 as a snow removal device is attached to the front vehicle body 6 via a lift arm 18.

1 will be described with reference to FIG. The cab 14 is provided with a door 22 for getting on and off on the left side (the front side in FIG. 4, the left side in FIG. 1), and an open holding structure 24 for the door in the vicinity of the left side. Although not shown in FIG. 1 and FIG. 4, the right side surface is provided with a door and a door opening holding structure that are formed substantially symmetrically on the right side.

The cab 14 is formed in a wide two-seater, and the left and right (perpendicular to the plane of FIG. 4) width is substantially the same as the left and right width of the wheel loader 2. The side surface on which the door 22 is installed is formed small on the front vehicle body 6 side of the cab 14 so as not to interfere with the front vehicle body 6 during refraction steering, and the door 22 occupies almost the entire side surface. The engine chamber 16 is located inside the cab 14 in the left-right width direction.

The door 22 is fully closed (state shown in FIG. 4) and fully opened by being rotated 180 degrees toward the engine chamber 16 by a pair of upper and lower door hinges 14 b and 14 c provided on the cab body 14 a on the engine chamber 16 side. It is attached so that it can be opened and closed freely. The door 22 in FIG. 1 is shown between a fully closed state and a fully open state.

The open holding structure 24 will be described. The open holding structure 24 includes a bracket 26 that is attached to the cab main body 14a so as to be inverted, a fixing means 28 that releasably fixes the bracket 26 to the “standing position” (position shown in FIG. 1), and a bracket 26 “standing position”. ”Includes a striker 30 as a holding member that is attached to a bracket 26 that engages with the catch 23 of the fully opened door 22 and holds the opened state of the door 22.

A hood 16a for maintenance inspection that can be freely opened and closed is attached to the side of the cab 14 on the side of the engine chamber 16 by hinges 16b and 16b so that the cab 14 can be opened and closed.

The open holding structure 24 will be described in more detail with reference to FIGS. The bracket 26 of the open holding structure 24 is formed in a columnar shape obtained by bending a steel plate into a cross-sectional channel shape, and a pair of side plate portions 26b and 26c are formed on both sides of the rectangular flat plate portion 26a. One end of the rectangular flat plate portion 26a in the longitudinal direction is attached to the vicinity of the door hinge 14c below the cab body 14a by the hinge 32, and the bracket 26 is inverted in the opening / closing direction of the door 22 (indicated by an arrow S in FIGS. 1 and 2). It is installed so that it can fall freely in the closing direction of the door 22. That is, the bracket 26 rotates around the hinge 32 between the “standing position” indicated by the solid line in FIG. 2 and the “inclined position” indicated by the two-dot chain line.

The bracket 26 abuts against the cab body 14a in the "standing position" on the hinge 32 attachment end side of the rectangular flat plate portion 26a of the pair of side plate portions 26b and 26c, and locks the door 22 from moving in the opening direction. A linear locking portion 26d is provided.

The fixing means 28 includes a pin 28a attached to the side plate portion 26b of the bracket 26 on the side of the engaging portion 26d and capable of moving forward and backward, and a pin that is provided in the cab body 14a and through which the tip of the pin 28a can be inserted and removed. A hole 28b is provided.

The pin 28a is slidably provided in a lock body 28c attached to the side plate portion 26b, and is urged by a compression spring 28d in the direction of the pin hole 28b. The pin 28a can be held by a lock portion 28f provided on the retracting side by retracting against the compression spring 28d using a bar-shaped grip 28e provided integrally.

The striker 30 as a holding member is formed in a bullet shape, and is attached to the end of the rectangular flat plate portion 26a opposite to the hinge 32 attachment end by a nut 31. The door 22 of the cab 14 is provided with a catch 23 for receiving the striker 30 in a releasable manner.

The striker 30 and the catch 23 described above are not limited to this form, and may be a well-known one such as a hook shape or a clamp shape that releasably holds the door.

The operation of the open holding structure 24 will be described. When the door 22 is opened approximately 180 ° and held in the open position, the bracket 26 is rotated until the locking portion 26d abuts against the cab body 14a to the “standing position”, and the pin 28a of the fixing means 28 is moved to the cab body 14a. Is inserted into the pin hole 28b and fixed at that position. And the catch 23 of the door 22 is engaged with the striker 30 which is a holding member at the front-end | tip of the bracket 26, and the door 22 is hold | maintained in an open position.

When opening and closing the hood 16a (FIG. 1) of the engine compartment 16 adjacent to the cab 14, the pin 28a of the fixing means 28 is removed from the pin hole 28b of the cab main body 14a, the fixing means 28 is released, and the bracket 26 is moved down. "Position" so that it does not obstruct the opening and closing of the hood 16a.

When it is not necessary to open and close the hood 16a, the bracket 26 is fixed to the "standing position" by the fixing means 28 so as not to obstruct the opening and closing of the door 22 of the cab 14.

The operation and effect of the cab door opening holding structure 24 as described above will be described.

The open holding structure 24 includes a bracket 26 that is attached to the cab body 14 so as to be able to be inverted, a fixing means 28 that releasably fixes the bracket 26 to the “standing position”, and a door that is open at the bracket 26 “standing position”. And a holding member 30 attached to a bracket 26 that engages with 22 and holds the open state of the door 22.

Therefore, when the door 22 is held in the open position, the door 22 is held in the open position by fixing the door 22 to the “standing position” by the fixing means 28 and engaging the door 22 with the holding member 30 of the bracket 26. When opening and closing the hood 16a and the like of the device adjacent to the cab 14, the fixing means 28 is released and the bracket 26 is tilted to the “falling position” so that the hood 16a and the like can be prevented from being opened and closed.

The bracket 26 is attached to the cab main body 14a by a hinge 32 so as to be inverted. Therefore, the bracket 26 can be easily inverted. Further, the bracket 26 is not lost.

The bracket 26 is installed so that it can be turned upside down in the opening / closing direction S of the door 22 and is turned down in the closing direction of the door 22. Therefore, by rotating the door 22 in the closing direction, the “falling position” space of the bracket 26 can be easily secured.

The bracket 26 includes a locking portion 26d that abuts the cab body 14a so as to be freely contactable and separable and locks the movement of the door 22 in the opening direction. Therefore, the bracket 26 can be reliably and easily positioned at the “standing position”.

The fixing means 28 includes a pin 28a that is attached to the bracket 26 and can be freely moved back and forth, and a pin hole 28b that is provided in the cab main body 14a so that a tip end portion of the pin 28a can be inserted and removed freely. It is biased in the direction of the hole 28b. Therefore, a fixing means that is easy to operate is provided.

FIG. 5 is a perspective view of a portion of the cab door opening holding structure configured according to the present invention, and is an enlarged view as seen from the direction of arrow B in FIG. 4. The top view of the open holding | maintenance structure of a door. The side view of the open holding | maintenance structure seen in the AA arrow direction of FIG. The side view of the wheel loader provided with the open retention structure of the cab door comprised according to this invention.

Explanation of symbols

14: Cab 14a: Cab body 22: Door 24: Open holding structure 26: Bracket 26d: Locking portion 28: Fixing means 28a: Pin 28b: Pin hole 30: Strike (holding member)
32: Hinge

Claims (6)

A bracket that can be mounted upside down on the cab body with the door attached,
Fixing means for releasably fixing the bracket to the “standing position”;
An open holding structure for a cab door, comprising: a holding member attached to a bracket that engages with an open door in a bracket "standing position" and holds the open door. The bracket is
It is attached to the cab body by a hinge so that it can be inverted.
The open holding structure for a cab door according to claim 1. The bracket is
Inverted freely in the door opening and closing direction,
Knocked down in the closing direction of the door,
3. An open holding structure for a cab door according to claim 1 or 2. The bracket is
It is provided with a locking part that comes into contact with and separates from the cab body and locks the movement of the door in the opening direction.
4. An open holding structure for a cab door according to claim 2 or 3. The fixing means is
A pin attached to the bracket that can be moved forward and backward,
The cab door opening and holding structure according to any one of claims 1 to 4, further comprising a pin hole provided in the cab main body and through which a tip end portion of the pin is inserted and removed freely. The pin is
Biased in the direction of the pin hole,
The cab door opening holding structure according to claim 5.

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