JPH0554482U - Fall warning device for mobile cranes - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is designed to prevent the danger of the mobile crane from tipping over when using a crane in a residential area at night. An object is to provide an alarm device. [Configuration] The fall warning device for a mobile crane according to the present invention comprises:
The warning means 9 in the conventional fall warning device is composed of a horn 9a and a warning light 9b, and a warning selection switch 12 is added. The start switch 11 is operated to a start position and at least one of the support force detection means 10 is activated. When the alarming means 9 is activated, the supporting force detecting means 10, the starting switch 11, and the audible alarm are activated so that at least the operation of the horn 9a of the alarming means 9 can be selected by the alarm selecting switch 12. 9a, the warning light 9b, and the alarm selection switch 12 are related by an electric circuit.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a fall warning device for a mobile crane.

[0002]

[Prior Art]

 As shown in FIG. 2 and FIG. 3, the mobile crane adopting the tipping warning device of the present invention is a hydraulic type equipped with outrigger devices 2 and 2 for supporting the body which are telescopically driven by hydraulic cylinders 1 and 1 on both sides. The crane 3 is attached to the chassis frame 5 between the operator's cab 4a and the loading platform 4b of the vehicle 4, and the vehicle travels via a power take-off 7 capable of connecting / disconnecting a hydraulic pump 6 that generates hydraulic pressure for driving the hydraulic crane 3. The engine 8 is configured to be connectable. The mobile crane constructed in this manner extends the hydraulic cylinders 1, 1 and grounds the outrigger devices 2, 2 to stabilize the vehicle 4 for crane work.

This type of mobile crane is equipped with a fall warning device for warning the fall of a crane operation. Since there is a risk of tipping over in this type of mobile crane on the left and right sides of the vehicle 4, the conventional tipping over warning device, as shown in FIG. The supporting force detecting means 10 and 10 for detecting when the force has become less than a predetermined value are attached, and the supporting force detecting means 10 and 10 are intervened in the electric circuit A for operating the alarm means 9, The alarm 9 is configured to be activated when at least one of the supporting force detecting means 1 and 1 is activated. Reference numeral 11 denotes a start switch that intervenes in the electric circuit A for operating the alarm means 9, and is a switch that is manually operated to start the fall alarm device. In this embodiment, the supporting force detecting means 10 and 10 are constituted by pressure switches which are connected when the pressure of the oil chamber on the load holding side of the hydraulic cylinders 1 and 1 drops below a predetermined value.

In the conventional fall warning device for a mobile crane thus configured, the starting switch 11 is turned on to perform the crane work. When there is no danger of falling during this crane work, the supporting force detection means 10, 10 of the hydraulic cylinders 1, 1 are inactive (switch OFF state in this example), so the alarm means 9 is activated. However, when a state in which a fall occurs is approached, the supporting force of the hydraulic cylinder 1 of the outrigger device 2 on the reversing and lowering side falls below a predetermined value, and the supporting force detecting means 10 attached to the hydraulic cylinder 1 operates ( In this example, the switch is turned on) and the alarm means 9 is activated. In the conventional fall warning device for a mobile crane, the warning means 9 is composed of a horn. When the starting switch 11 is operated to the starting position, at least one of the supporting force detecting means 10 and 10 is activated to notify the crane operator of a dangerous state with an alarm sound.

However, the conventional fall warning device for a mobile crane configured as described above is operated in a state where the start switch 11 is operated to the start position and the start switch 11 is operated to the operation position during the crane work. Since at least one of the supporting force detection means 10 and 10 is activated, and the activation switch 11 is operated to the activation position with the outriggers 2 and 2 not being grounded, the alarm means 9 is activated, so There is a problem that this alarm sound is annoying when performing crane work in a residential area.To address this problem, when starting a crane operation in a residential area at night, shut off the start switch 11 and fall. There were cases where crane work was performed with the alarm device not operating. However, the crane work with the start switch 11 cut off poses a safety problem since there is a risk of tipping over the mobile crane.

[0005]

[Problems to be solved by the device]

 The object of the present invention is to solve the above-mentioned problems of the prior art, and to make it possible to alert the danger of the mobile crane toppling over with a light instead of an audible alarm when operating a crane in a residential area at night. It is intended to provide a fall warning device for a mobile crane.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the fall warning device for a mobile crane according to the present invention is configured such that the warning means 9 in the conventional fall warning device is composed of a horn and a warning light, an alarm selection switch is added, and a start switch is provided. The alarm means is activated when operated to the starting position and at least one of the supporting force detecting means is activated, and at least the operation of the horn of the alarm means can be selected by the alarm selection switch. The supporting force detecting means, the starting switch, the alarm, the warning light, and the alarm selection switch are associated with each other by an electric circuit.

[0007]

[Action]

 In the fall alarm device for a mobile crane of the present invention configured as described above, at least the operation of the horn can be selected by operating the alarm selection switch. In addition to warning the danger of falling with a warning sound from a horn, in a residential area at night, a warning light can be used without causing noise to be scattered around.

[0008]

【Example】

 An embodiment of a fall warning device for a mobile crane according to the present invention will be described below with reference to FIG. Reference numerals 1 to 11 and A shown in FIGS. 2 to 3 and used in the description of the prior art are used as synonyms in the following description.

As shown in FIG. 1, in the fall warning device for a mobile crane according to the present invention, the warning means 9 is composed of a horn 9a and a warning light 9b. The warning light 9b is attached to an appropriate position of the hydraulic crane 3 or the vehicle 4 (a place where the crane operator located at the operation position of the hydraulic crane can be visually recognized). Reference numeral 12 denotes an alarm selection switch. The alarm selection switch 12 operates the horn 9a when the activation switch 11 is operated to the activation position and at least one of the supporting force detecting means 10 and 10 is activated. It is for selecting whether to activate. That is, the tipping warning device of the present invention is mounted on each hydraulic cylinder of the outrigger, and detects the support force acting on the corresponding hydraulic cylinder being below a predetermined value to activate the support force detecting means 10, 10, An activation switch 11, an alarm means 9 including a horn 9a and a warning light 9b, and an alarm selection switch 12 are provided, and the activation switch 11 is operated to an activation position and the supporting force detection means 10 and 10 are operated. The supporting force detecting means 10, 10 are arranged so that the alarm means 9 is activated when at least one of them is activated, and at least the operation of the horn 9a of the alarm means 9 can be selected by the alarm selecting switch 12. , The activation switch 11, the horn 9a, the warning light 9b, and the alarm selection switch 12 are associated by the electric circuit A.

Next, the operation will be described. When a normal crane work is performed, the alarm selection switch 12 is operated at a position where the horn 9a operates. In this case, when there is a risk of the mobile crane tipping over, the warning sound is issued as in the case of the conventional tipping warning device, and the warning lamp 9b is turned on. When the mobile crane is used in a residential area at night, the alarm selection switch 12 is used at a position where the horn 9a does not operate. In this case, when there is a risk of the mobile crane falling, the horn 9a does not operate and the warning light 9b operates. Therefore, the noise of the horn 9a is not scattered to the surrounding environment. The crane operator can know the danger of falling by turning on the warning light 9b.

In the above embodiment, the alarm selection switch 12 is provided in the electric circuit so that it can be selected between the position where the horn 9a operates and the position where it does not operate. However, the horn 9a and the warning light 9b are provided. Alternatively, only one of the two may be used to give an alarm. Further, in the above-described embodiment, the start switch 11 is described as a manually operated switch, but a switch that operates in conjunction with the hydraulic pump 6 connected to the vehicle running engine 8 by the power take-off 7 is provided. Of course, the present invention can be implemented even if the switch is automatically operated as the starting switch 11.

[0012]

[Effect of the device]

 The fall warning device for a mobile crane according to the present invention configured as described above has a very simple structure, but can alert the danger of the fall of the mobile crane by selecting sound and light. It can be applied to crane work in a place where the noise generated by the warning sound cannot be scattered, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fall warning device for a mobile crane according to the present invention.

FIG. 2 is a side view of a mobile crane to which the tipping warning device of the present invention is applied.

FIG. 3 is a rear view of a mobile crane to which the fall warning device of the present invention is applied.

FIG. 4 is an explanatory diagram of a conventional fall warning device for a mobile crane.

[Explanation of symbols]

 1, 1 hydraulic cylinder 2, 2 outrigger device 3 hydraulic crane 4 vehicle 5 chassis frame 6 hydraulic pump 7 power take-off 8 vehicle running engine 9 alarm means 9a horn 9b warning light 10, 10 bearing force detection means 11 start switch 12 Alarm selection switch

Claims (1)

[Scope of utility model registration request] 1. A fall warning for a mobile crane, comprising a hydraulic crane equipped on both sides thereof with outriggers for supporting a body, which is telescopically driven by hydraulic cylinders, mounted on a chassis frame between a cab of a vehicle and a loading platform. A device, which is attached to each of the hydraulic cylinders, detects a support force acting on the corresponding hydraulic cylinders to be a predetermined value or less, and activates the support force detection means, a start switch, a horn and a warning light. And an alarm selection switch, the alarm means being activated when the activation switch is operated to an activation position and at least one of the supporting force detection means is activated, and at least the alarm means The supporting force detecting means, the activation switch, the horn, the warning light, and the Tipping alarm device of the mobile crane, characterized in that with the warning selector switch in the electric circuit are in association.