JPH0743214Y2 - Construction equipment fall protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fall protection device for a construction machine, particularly a construction machine, which is mounted on a bulldozer and protects an operator when the vehicle falls.

[Conventional technology]

Bulldozers are operated under the condition that they may fall on rough terrain. In order to protect the operator in the event of a fall, the bulldozer has a gate-shaped fall protection as shown in Fig. 4. Equipment (ROPS) is provided.

FIG. 5 is a front view of a conventional overturn protection device, in which 1 is a driver's cab, and the driver's cab 1 is a main girder 2a, 2 of a vehicle body.
The four corners are mounted by a rubber mount 5 on a floor 4 provided on the upper surface of b via supporting legs 3a and 3b so as to be bufferable.

Then, in order to protect the driver's cab 1, a protective device S at the time of tipping is formed of a gate-shaped frame so as to cover the driver's cab 1.
Are erected on the upper surfaces of the main girders 2a, 2b of the vehicle body.

The fall protection device S is usually manufactured from a flat structure, and the bases 6a and 6b are firmly attached to the upper surfaces of both main girders 2a and 2b by bolts 7 and the upper surfaces of the main girders 2a and 2b are cab 1 It is erected so as to project above the floors 4 on both sides. And
Both vertical frames 8a, 8b so as to proudly cover the cab 1
Are firmly connected by bolts 9.

[Problems to be solved by the device]

However, since the bases 6a, 6b and the vertical frames 8a, 8b of the conventional overturn protection device S are provided substantially upright on the upper surfaces of the main girders 2a, 2b on both sides, the width dimension (L ₂ ) of the device S is the same. Since the main girders 2a, 2b cannot be wider than the width dimension (L ₁ ), the vertical dimensions 8a, 8b can be set close to the side surface of the cab 1 in view of the width dimension (L ₃ ) of the cab 1. It is set up.

For this reason, the floor 4 has a space only for grounding the operator's cab 1, and there is no room for a so-called service floor for operator's machine inspection and maintenance on the floor 4.

In addition, the safety standard of the SAE standard for the recent fall protection device has been revised, and the conventional standard has a constant load (F ₁ ) from the lateral direction.
However, in addition to this lateral load, the load in the front-rear direction (F ₂ ) was added, so that the vertical frames 8a, 8b of the fall protection device S were attached to the upper surfaces of the bases 6a, 6b like traffic jams. With the structure in which the vertical bolts 9 are tightened via the flanges 10, the flanges 10 and the bolts 9 cannot be endured unless the flanges 10 and the bolts 9 are significantly thickened. When a lateral load (F ₁ ) is applied to the vertical frame 8a side, it can withstand to support the vertical frame 8b on the opposite side which is a gate shape, but this is not the case with the longitudinal load (F ₂ ).

The present invention has been made in order to improve the above conventional problems, and provides a fall protection device that can secure a sufficient space on the service floor and can also pass the front-back load test, which is a safety standard of SAE standard. Is what you are trying to do.

[Means and Actions for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has a first structure, in which a driver's cab installed on a floor, which is mounted on the upper surfaces of main girders on both left and right sides of a vehicle body via support legs, is partially covered to protect against falls. When the device is mounted on the upper surface of both main girders via a base, one or both of the bases on both the left and right sides of the fall protection device are laterally overhung, and the top protection is provided on the top face of the base. The equipment is combined to form a protection device against the fall of construction machinery that has a service floor on one or both sides of the operator's cab. In the second configuration, the floor is attached to the upper surface of the main girder on both the left and right sides of the vehicle body via the supporting legs. In the case where the fall protection device partially covering the driver's cab installed on the upper surface of both main girders is mounted through the base, the inner surface of the lower end of the vertical frame of the fall protection device is attached to the base. While touching the outer surface of the table, A stop pin that connects with the vertical frame and inserts a knock pin for directly transmitting the longitudinal shearing force applied to the vertical frame to the base, and prevents the vertical frame from rotating. Since the fall protection device for a construction machine provided at the lower edge of the vertical frame is configured so as to engage with the base, both vertical frame intervals of the fall protection device of the portal structure overhang sideways. It becomes wider by installing it on the base, and it becomes possible to secure the space of the service floor on one side or both sides of the cab. Also, the two vertical frames of the gate shape are tightened with horizontal bolts on the side of the base. With the coupling and the knock pin and stopper, even if the vertical frame tries to rotate with the knock pin as a fulcrum not only for lateral load but also for fore-and-aft load, it is blocked by the bolt and stopper. And it is intended to provide the fall protection device sufficiently pass possible with the construction machine with respect to the safety standards of SAE standards will receive and transmit the shear stress directly to the base.

〔Example〕

An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows the present invention for protecting the cab 1 by partially covering the cab 1 which extends parallel to the longitudinal direction and is installed on the main girders 2a, 2b constituting the vehicle body frame. It is a first embodiment of the fall protection device S ₁ and the drawing shows the operator's cab 1 and the fall protection device S ₁ from the front with a cross section of the main girder.

The left and right main girders 2a, 2b project upward so as to form a vehicle body frame, and are formed into a ship shape by a connecting frame 12. Bases 13 and 14 for supporting the fall protection device S ₁ having a gate structure are provided on the protruding upper surfaces of the two main girders 2a and 2b.
Is mounted at a position just covering substantially the center of the cab 1.

Of these left and right bases 13 and 14, the base 13 on the left side in the figure is L
The L-shaped upright piece 13a is formed in a so-called overhanging shape that is formed in a letter shape and greatly protrudes to the side.
Is firmly fixed to the upper surface of the main girder 2a with bolts 14, and a bracket 15 is fixed to the outer surface of a horizontal piece 13b extending horizontally from the upright piece 13a. On the other hand, the base 14 on the right side in the figure has an upright structure that extends upward to the side of the cab 1, and its lower end is fixed to the main girder 2b with the bolts 14 as firmly as the base 14. There is.

Next, the left and right vertical frames 1 of the fall protection device S ₁ are mounted on the bases 13 and 14 fixed to the upper surfaces of the left and right main girders 2a and 2b, respectively.
The lower ends of the left and right frames 16a, 16b of the fall protection device S _{1 having} a gate structure are joined by 6a, 16b and a horizontal frame 17 connecting the left and right vertical frames 16a, 16b at the upper part.

A mounting plate 19 as shown in FIG. 2 is also fixed to the inside of the lower end support portion of the vertical frame 16a of the one base 13 that laterally overhangs in an L shape, and the bracket 15 of the base 13 is attached.
In addition, the plurality of bolts 20 are laterally inserted into these matching holes and then tightened and joined. Furthermore,
A knock pin 21 is laterally inserted into the coupling portion 18,
Moreover, a stopper 22 is attached to the lower end edge of the vertical frame 16a so as to engage with the outer end portion 23 of the base. On the upper surface of the upright base 14 on the other side, each flange 25 having the same connection as the conventional one is connected to the connecting portion 24 with the vertical frame 16b.
Are joined together and tightened by bolts 26 from the vertical direction. Since it is connected in this way, the load from the lateral direction (F ₂ )
Respect can withstand the Gantry as in the prior art is also in the front-rear direction load (F _2), the vertical frame 16a,
Even if the lower end 16b of the knock pin 21 acts as a fulcrum and the lower end tries to rotate in the direction opposite to the load direction, the stopper 22 blocks it, so that it can withstand this load (F ₁ ) sufficiently. .

Next, the installation of the cab 1 will be described. Main beam 2a floor 27 of the left and right sides of installing the cab 1, support legs 28a attached to 2b, after being supported by 28b, transverse the fall protection apparatus S ₁ of the left and right vertical frames 16a, 16b of the A wide floor 27 is formed which extends to the inner side surface portion, and thus is laterally greatly extended by the main girder 2a due to one side overhang.

On the wide floor 27 formed in this way, the operator's cab 1 is installed close to the vertical frame 16a on the overhung side, whereby a large service floor portion 27a is secured on the floor 27.

FIG. 3 shows a second embodiment of the overturn protection device S _{2 according} to the present invention. One side of the first embodiment in which the bases 28a, 28b attached to the left and right main girders 2a, 2b are already described. A structure with a large overhang toward the left and right is provided symmetrically on both sides, and both vertical frames 29a, 29b of the protective device S ₂ at the time of fall are connected in a state of protruding from the main girders 2a, 2b to the left and right sides. Will be done. This coupling structure is the same as that of the first embodiment.

Then, between the fall protection devices S ₂ with wider width, the floor
30 is supported by the main girders 2a, 2b via the supporting legs 31a, 31b,
The operator's cab 1 is installed in the center on this floor 30, and service floor portions 30a and 30b are secured on both sides. The other structure is the same as that of the first embodiment.

[Effect of device]

As described above in detail, the present invention has a structure in which one or both of the bases for connecting the fall protection device are laterally overhung so that the width is larger than the main girder width on both sides. Can be increased and a service floor can be secured. In addition, this overhanging base structure allows the vertical frame of the overturn protection device to be connected with horizontal bolts, and knock pins and stopper structures are also possible. Since it is also strengthened, it can pass the SAE standard safety standards.

[Brief description of drawings]

1 and 2 show a first embodiment of a protection device for a construction machine in a fall according to the present invention. FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a second embodiment. The front view shown in FIG. 4 is a schematic side view of a bulldozer equipped with a conventional fall protection device,
FIG. 5 is a front view of a conventional overturn protection device. 1 …… Operator's cab 2a, b …… Main girder 3,28,31 …… Floor support 4,27,30 …… Floor S, S ₁ , S ₂ …… Roller protection device 6,13,14,28… … Base 8,16,29 …… Vertical frame 17 …… Horizontal frame 18,24 …… Coupling 21 …… Knock pin 22 …… Stopper 27a, 30a, b …… Service floor

Claims (2)

[Scope of utility model registration request] 1. A fall protection device for partially covering a driver's cab installed on a floor, which is mounted on the upper surface of a main girder on both left and right sides of a vehicle body via supporting legs, and said both main girders are mounted via a base. When installed on the upper surface, one or both of the bases on both the left and right sides of the fall protection device are laterally overhanged, and the fall protection device is coupled to the top surface of the base to connect to one side of the cab or A protective device against falling of construction machinery, which has service floors on both sides. 2. The both main girders through a base of a fall protection device, which partially covers an operator's cab installed on a floor, which is mounted on the upper surfaces of the main girders on the left and right sides of the vehicle body via supporting legs. When attached to the upper surface, the lower end inner side surface of the vertical frame of the fall protection device is brought into contact with the outer surface of the base,
While connecting by bolting from the lateral direction, a knock pin for directly transmitting the shearing force applied to the vertical frame in the front-rear direction to the base is inserted between the vertical frame and the base, and,
A fall protection device for a construction machine, wherein a stopper for preventing rotation of a vertical frame is provided at a lower edge of the vertical frame so as to engage with the base.