Cab for construction machine

Patent metadata

Field	Value
Publication number	US-11479210-B2
Application number	US-202016990314-A
Country	US
Kind code	B2
Filing date	Aug 11, 2020
Priority date	Sep 26, 2019
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

Provided is a compact and high-strength cab capable of securing an excellent field of view for work. The cab includes a guard protecting a cab body, and a wiper having a blade to wipe a front window member and a blade actuator for actuating the blade. The guard includes a pair of side pillars and an actuator housing beam interconnecting the side pillars and housing the blade actuator. The actuator housing beam includes a hollow beam body formed with a body opening and a front-rear partition plate partitioning the inside of the beam body into front and rear sections. The body opening allows the blade actuator to be assembled to the front-rear partition plate therethrough.

First claim

The invention claimed is:

1. A cab for a construction machine, comprising:
a cab body defining an operator's compartment and including a front window member facing forward;
a guard for protecting the cab body; and
a wiper configured to wipe off water droplets on an outer surface of the front window member, wherein:
the wiper includes a pair of link arms having respective proximal ends, a blade supported by the pair of link arms so as to make tight contact with an outer surface of the front window member, and a blade actuator configured to swing the pair of link arms about axes passing through the respective proximal ends of the pair of link arms in a front-rear direction to thereby reciprocate the blade along the outer surface of the front window member;
the blade actuator includes a link arm support unit that supports the respective proximal ends of the pair of link arms so as to allow the pair of link arms to swing, a blade drive motor for generating power, and a drive transmission mechanism configured to transmit the power generated by the blade drive motor to the pair of link arms to swing the pair of link arms;
the guard includes a pair of side pillars extending along opposite edges of the cab body in a width direction of the cab body, respectively, and at least one beam disposed between the pair of side pillars to interconnect the pair of side pillars in the width direction;
the at least one beam includes an actuator housing beam that houses the blade actuator, the actuator housing beam including a hollow beam body extending in the width direction along an upper front portion of the cab body, and a front-rear partition plate partitioning a beam interior space, which is an internal space of the beam body, into front and rear sections; and
the beam body is formed with a body opening that provides communication between an inside and an outside of the beam body, the body opening allowing the blade actuator to be assembled to the front-rear partition plate through the body opening and allowing the pair of link arms to extend from the blade actuator to an outside of the actuator housing beam through the body opening to support the blade.

2. The cab according to claim 1 , wherein the front-rear partition plate is formed with a partition opening in an area facing the body opening, the partition opening penetrating the front-rear partition plate in the front-rear direction and allowing the drive transmission mechanism to pass through the partition opening from front to rear of the front-rear partition plate, and the drive transmission mechanism is disposed rearward of the front-rear partition plate to which the blade actuator is assembled.

3. The cab according to claim 2 , wherein: the link arm support unit includes a pair of drive shafts extending in the front-rear direction and having respective front ends to which respective proximal ends of the pair of link arms are connected, respectively, and a support member supporting the pair of drive shafts so as to allow the pair of drive shafts to rotate about respective axes passing through the drive shaft in the front-rear direction; the pair of drive shafts penetrate the support member in the front-rear direction; the partition opening allows the pair of drive shafts and an output shaft of the blade drive motor to pass through the partition opening in the front-rear direction; and the drive transmission mechanism is located rearward of the support member and disposed so as to interconnect the pair of drive shafts and the output shaft at the position rearward of the front-rear partition plate that has a front face to which the support member is fixed.

4. The cab according to claim 1 , wherein the actuator housing beam further includes a cover to be attached to the beam body to close the body opening, the cover being formed with a cover opening that has a shape allowing the pair of link arms to extend from the blade actuator to an outside of the cover through the cover opening and the body opening and allowing the pair of link arms to swing.

5. The cab according to claim 4 , wherein the cover further includes an inner wall extending rearward from a peripheral edge of the cover opening to enclose the cover opening.

6. The cab according to claim 1 , wherein the pair of link arms are disposed to extend downward from the beam body.

7. The cab according to claim 1 , wherein the actuator housing beam further includes a right-left partition plate intersecting the front-rear partition plate in the beam body to partition the beam interior space into right and left sections.

8. The cab according to claim 7 , wherein: the front-rear partition plate has a first end adjacent to one end of the beam body in the width direction and a second end opposite to the first end and extends in the width direction from the first end to the second end; the right-left partition plate is disposed so as to intersect the first end of the front-rear partition plate to partition the beam interior space into an end space defined between the first end and the one end of the beam body and an actuator housing space in which the blade actuator is housed, the right-left partition plate having a shape defining an insertion opening that provides communication between the end space and the actuator housing space; and the insertion opening allows a cable connected to the blade drive motor disposed in the actuator housing space to be led into the end space through the insertion opening and connected to an external cable led from the outside of the beam body in the end space.

9. The cab according to claim 1 , wherein the wiper further includes a link member that interconnects respective distal ends opposite to the proximal ends of the pair of link arms to constitute a parallel link mechanism in cooperation with the pair of link arms and the blade actuator, and the blade is fixed to the link member.

Assignees

• Kobelco Constr Mach Co Ltd

Inventors

• Yamamoto Keiji
• Shimoi Takuzo

Classifications

• B60S1/0452

  Position of the wipers relative to the vehicle · CPC title

• B62D33/06

  Drivers' cabs {(overhead guards, e.g. against loads falling down B60R21/11; roll-over protection B60R21/13)} · CPC title

• B60S1/24

  by rotary cranks · CPC title

• B60R2021/0081

  Working vehicles · CPC title

• B60S1/3495

  Means for mounting the drive mechanism to the wiper shaft · CPC title