JPH08100442A - Cab guard device for construction machine - Google Patents

Abstract

PURPOSE: To improve the driving visibility by connecting multiple plate members to form a cab guard protecting a driver's cab from scattered gravel, bendably fitting the cab guard along guide rails on both sides, and opening it when unnecessary. CONSTITUTION: Multiple guard plate members 26, 27, 28 are bendably connected to form a cab guard 25 protecting the cab 15 of a hydraulic shovel, rollers 24 are provided on both sides, and the cab guard 25 is fitted movably along guide rails 16. The cab guard 25 is fitted openably by a hand winch 19. A hydraulic winch or an electric winch operated via a switch action may be arranged in place of the hand winch 19. When the cab guard 25 is not required, the winch 19 is operated to open the cab guard 25, the driving visibility is improved, and a front glass can be easily cleaned. The convenience of the driving action can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab guard device mainly installed in a cab for a construction machine such as a hydraulic excavator and a working vehicle.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view of a cab 2 equipped with a conventional cab guard 1. In the figure, 3 is the front guard of the cab guard 1, 4 is the head guard, 5 and 6 are the frame frames of the front guard 3 and head guard 4, 7 and 8 are wire mesh, and 9 and 10 are fixed to the cab 2. The front guard 3, which is installed against the cab 2,
A plurality of brackets for fixing the head guard 4,
11 and 12 are tightening bolts.

A hydraulic excavator (not shown) which is a construction machine carries out a crushing work by attaching a crusher such as a breaker or a crusher to its work attachment. In that case,
Stone fragments and debris fragments are scattered and collide with the cab 2 from the front and above. In order to protect the gravel fragments, demolition fragments, and the like, a band-shaped cab guard 1 having a wire mesh stretched from the front surface side to the upper surface side of the cab 2 is attached.

[0004]

The hydraulic excavator does not always perform the crushing work, but also performs the excavating work by replacing the crushing tool at the tip of the work attachment with the bucket. During this excavation work, stone and debris will not fly out, so I'd like to remove the cab guard with the wire mesh to make it easier to see ahead. However, since the cab guard is bolted to many brackets and has a considerable weight, it is difficult to easily remove the cab guard. Further, when the cab guard is attached, it is difficult to remove dust collected on the entire surface of the windshield of the cab for cleaning. An object of the present invention is to provide a cab guard device that can solve the above problems.

[0005]

According to the present invention, there is provided a cab guard device in which a belt-like cab guard is attached so as to cover the cab for a driver's cab from the front side to the upper side for protection against scattered stones and gravel. Roller guide rails are extended respectively on both left and right edges of the outer peripheral surface portion from the front side to the upper side to the rear side, and the longitudinal direction of the cab guard is divided to form a plurality of guard plate members. , The plurality of guard plate members are respectively bent and rotatable in the front-rear direction, and a plurality of rollers guided by the roller guide rails are attached to a side end surface portion of the cab guard. It is fitted so that it can slide along the cab, and a cable is connected to the upper end of the cab guard, and the cable is placed behind the cab. Configured as wound up by Ji. Further, in the present invention, instead of arranging the hand winch, a hydraulic winch or an electric winch is arranged. Further, in the present invention, only one guard plate member on the lower end side among the plurality of divided guard plate members is separated,
It was detachably attached to the lower end on the front side of the cab. Further, the guard plate member on the lower end side is formed in a divided shape of an upper guard part and a lower guard part, and the upper guard part is attached to the lower guard part so as to be bent and rotatable in the front direction.

[0006]

According to the present invention, when a hand winch (including a hydraulic winch, an electric winch, etc.) arranged on the rear side of the cab is hoisted, the cab guard slides upward or rearward along the roller guide rails, and the cab guard moves. It is stowed up and stowed from the upper side to the rear side. Further, since only one lower end guard plate member of the plurality of guard plate members is separated and detachably attached to the lower end portion on the front side of the cab, the lower end guard plate member is removed as required. be able to. Also, the lower-end guard plate member is formed in a divided shape of the upper guard portion and the lower guard portion, and the upper guard portion is attached to the lower guard portion so that it can be bent and rotated in the front direction, so that it can be rotated as required. By unlocking the upper guard portion, the upper guard portion can be rotated downward and hung down.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator equipped with the cab guard device of the present invention. In the figure, 13 is a lower traveling structure of the hydraulic excavator, 14 is an upper revolving structure, 15 is a cab for the cab mounted on the upper revolving structure 14, 16
L and 16R are roller guide rails extending from the front surface side to the upper surface side of the outer peripheral portion of the cab 15 (the roller guide rails 16R are not visible because they are on the opposite side of 16L in FIG. 1), and 17 is the front surface side of the cab 15. A plurality of brackets that are provided upright (by bolting or welding) on both upper left and right edges to support and fix the roller guide rails (mainly by welding), 18 is a cable,
9 is a hand winch for manually operating the cable 18 and 20 is a hoisting lever 21 for the band winch 19
Reference numeral 22 is a fixed sheave, and 23 is a work attachment mounted on the front portion of the upper swing body 14. FIG. 2 is a side view of an essential part in which the roller guide rail 16L in FIG. 1 is in an open state. In the figure, 24 is a plurality of rollers fitted to the roller guide rail 16L (16R is also the same), 25 is a cab guard, 26, 27, 2
8 is a guard plate member forming the cab guard 25, 29 is a guard plate member separately arranged on the lower end side of the cab guard 25, 30 is a lower guard portion of the guard plate member 29, and 31 is an upper side. Guard part, 32 is upper guard part 31
Is a fulcrum pin pivotally supporting the lower end base of the, and 33 is a locking bolt for locking the upper guard part 31 to the bracket 34.

FIG. 3 is a sectional view of an essential part taken along the line AA of FIG. Reference numeral 35 is a roller pin that pivotally supports the roller 24 and rotatably connects the guard plate members 26, 27, and 28. FIG. 4 is a sectional view of an essential part showing the inside of a hand winch 19 which is a commercially available product. In the figure, 36 is a brake lock switching handle of the hand winch 19, 37 is a ratchet pawl provided on the brake locking switching handle 36, and 38 is a ratchet tooth on the winding drum side that meshes with the ratchet pawl. The brake of the hand winch 19 is locked when the switching handle 36 is switched in the direction of arrow a, and the brake is released when switched in the direction of arrow b. FIG. 5 is a side view of essential parts showing a state in which the cab guard 25 in FIG. 2 has been operated for hoisting. FIG. 6 is a plan view of an essential part viewed from B of FIG. In the figure, 39 is a windshield on the front of the cab 15.

Next, the configuration of the cab guard device of the present invention will be described with reference to FIGS. According to the present invention, the roller guide rails 16L and 16R are extended by supporting brackets 17 at both left and right edges extending from the front side to the rear side of the outer peripheral surface of the cab 15, and the front and rear of the cab guard 25. The longitudinal direction is divided into a plurality of guard plate members 26, 27, 28 to form the guard plate members 26, 27, 28.
27 and 28 are connected to each other so that they can be bent and rotated in the front-rear direction, and a plurality of rollers 24 guided by the roller guide rails 16L and 16R are attached to the side end surface portion of the cab guard 25 to attach the cab guard 25 to the roller guide. It is slidably fitted along the rails 16L and 16R, and the cable 18 is connected to the upper end of the cab guard 25.
The cable 18 is configured to be wound up by a hand winch 19 arranged on the rear side of the cab 15. Further, in the present invention, instead of arranging the hand winch 19, a hydraulic winch or an electric winch (neither hydraulic winch nor electric winch is shown) is arranged. Further, in the present invention, only one guard plate member 29 on the lower end side of the cab guard 25 is separated and detachably attached to the lower end portion on the front side of the cab 15 by tightening bolts 40 (shown in FIG. 2). Further, the guard plate member 29 is formed in a divided shape of the upper guard portion 31 and the lower guard portion 30, and the upper guard portion 31 is directed forward with respect to the lower guard portion 30 (direction of arrow C shown in FIG. 5). In addition, the fulcrum pin 32 is configured so as to be capable of bending and turning.

Next, the operation of the cab guard device of the present invention will be described. In the present invention, when the hoisting lever 20 of the hand winch 19 is hoisted in the direction of the arrow D (shown in FIGS. 2 and 5), the cab guard 25 moves upward or rearward along the roller guide rails 16L and 16R. It slides to, and as shown in FIG. 6, it is flipped up from the upper surface side of the cab 15 to the rear side and stored. Also hand winch 1
In the cab guard device in which a hydraulic winch or an electric winch is arranged instead of 9, the hydraulic winch and the electric winch can be driven by a switch operation, so that the driver can save labor and is convenient. Further, in the present invention, only one guard plate member 29 on the lower end side of the cab guard 25 is separated and attached to the lower end portion on the front surface side of the cab 15 by tightening bolts 40. Since the weight of this one guard plate member 29 is not particularly heavy, the guard plate member 29 can be removed by loosening and removing the bolt 40 when it is desired to remove it. When it is determined that the guard plate member 29 should be completely removed, the guard plate member 29
Loosen the locking bolt 33 (shown in FIG. 2) that locks the upper guard part 31 in FIG. Then, the fulcrum pin 32 at the lower end base of the upper guard part 31 is rotated in the front direction (the direction of arrow C shown in FIG. 5). The upper guard part 33 is in a state of hanging down from the fulcrum pin 32.
As shown in, the cab guard does not exist in the range of the angle θ extending from below the driver's forward field of view to above. The driver can easily see the front side and can easily clean the windshield 39 (shown in FIG. 6) of the cab 15.

[0011]

In the cab guard device of the present invention, when the hoisting lever of the hand winch is hoisted, the cab guard is slid upward or rearward along the roller guide rails and rearward from the upper side of the cab. Folded and stored across the sides. Further, in the cab guard device in which a hydraulic winch or an electric winch is arranged instead of the hand winch, the hydraulic winch and the electric winch can be driven by a switch operation, which saves the driver's labor and is convenient. Further, in the present invention, only one guard plate member on the lower end side of the cab guard is separated and detachably attached to the lower end portion on the front face side of the cab. Since the weight of this one guard plate member is not particularly heavy, it can be easily removed when it is desired to remove it. When it is determined that the guard plate member on the lower end side has not been removed, the upper guard portion of the guard plate member is unlocked so that the upper guard portion can be rotated downward to hang down. it can. By combining the hanging state of the upper guard portion and the flip-up storage state of the cab guard, the cab guard does not exist in a certain angle range extending from below the driver to above. Therefore, in the cab guard device of the present invention, the front of the driver can be clearly seen by slidingly moving the cab guard, and the windshield of the cab can be easily cleaned.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator equipped with a cab guard device of the present invention.

FIG. 2 is a side view of an essential part of the roller guide rail in FIG. 1 in an open state.

FIG. 3 is a cross-sectional view of a main part seen from AA in FIG.

FIG. 4 is a sectional view of an essential part showing the inside of a hand winch.

FIG. 5 is a side view of essential parts showing a state in which the cab guard in FIG. 2 has been operated for hoisting.

6 is a plan view of an essential part seen from B in FIG.

FIG. 7 is a perspective view of a cab equipped with a conventional cab guard.

[Explanation of symbols]

 1,25 Cab guard 2,15 Cab 9,10,17,34 Bracket 16L, 16R Roller guide rail 18 Cable 19 Hand winch 24 Roller 26,27,28,29 Guard plate member 30 Lower guard part 31 Upper guard part 32 Support pin 33 Locking bolt 35 Roller 39 Windshield

Claims (5)

[Claims] 1. A cab guard device in which a belt-shaped cab guard is attached so as to cover the cab for the driver's cab from the front side to the upper side for protection against scattered gravel, etc. Roller guide rails are respectively provided at both left and right edges of the cab guard, and the longitudinal direction of the cab guard is divided into a plurality of guard plate members. Are connected so that they can be bent and rotated in the front-rear direction, and a plurality of rollers guided by the roller guide rails are attached to the side end surface of the cab guard, and the cab guard is slidably mounted along the roller guide rails. Together,
A cab guard device for a construction machine, characterized in that a cable is connected to an upper end of the cab guard, and the cable is wound up by a hand winch arranged on the rear side of the cab. 2. The cab guard device for a construction machine according to claim 1, wherein a hydraulic winch is arranged instead of the hand winch. 3. The cab guard device for a construction machine according to claim 1, wherein an electric winch is arranged instead of the hand winch. 4. The cab guard device for a construction machine according to claim 1, wherein only one guard plate member on the lower end side of the plurality of divided guard plate members is separated, A cab guard device for construction machinery, which is detachably attached to the lower end of the front side of the cab. 5. The cab guard device for a construction machine according to claim 4, wherein the guard plate member on the lower end side is formed into a divided shape of an upper guard portion and a lower guard portion, and the upper guard portion is lowered. A cab guard device for a construction machine, wherein the cab guard device is attached to a side guard part so as to be capable of being bent and rotated forward.