JPH0628546Y2 - Fall prevention alarm device for UNIC crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an alarm device for preventing a UNIC crane from falling over.

(Prior Art) Unic cranes are often used to transport materials and other materials. When using the crane 51 of the UNIQ crane vehicle 50, as shown in FIG. 5, the outriggers 52 are extended on both sides of the UNICK crane vehicle 50. However, since it is used frequently, the weight of the suspended load is often confirmed by the crane operator or the like as a guide. Therefore, if the crane 51 with a suspended load attached to the tip thereof overextends to the side of the uniced vehicle 50 too much, the uniced vehicle may fall due to imbalance due to the weight of the suspended load.

Therefore, in some cases, for the sake of safety, a guard is placed to pay attention to the slinging method and the lifting of the outrigger.

(Problems to be solved by the invention) However, the crane operator and the safety watcher should pay attention to the suspended load, such as whether the suspended load will not collapse or there are no people or objects at the destination of the suspended load. It is easy to be caught and often does not notice the lifting of the outrigger of the UNIC crane vehicle. Under these circumstances, accidents of falling UNIC vehicles have occurred.

Therefore, the present invention has an object to provide an extremely easy-to-install device which immediately detects and alerts when one of the outriggers protruding from both sides of the unic vehicle is lifted.

(Means for Solving the Problem) In the case of the present invention, when the UNIC vehicle falls due to the load of a suspended load at the tip of a crane or the crane overhanging in the lateral direction, it overhangs on both sides as a front shake. Focusing on the point that one of the outriggers floats above the ground and the other tilts or sinks, the alarm device is equipped with a sensor that detects these ups and downs. It is a thing.

The specific structure is that a frame provided with a magnet is provided on one side, and an alarm circuit composed of a power source and an alarm device is provided in the frame, and two alarm switches are provided in parallel with each other. Each switch of this alarm circuit is provided with an upper limit contact and a lower limit contact facing each other, an electrode plate that can be raised and lowered between both contacts is provided, and a spring that presses this electrode plate so as to always contact the lower limit contact is provided, A lever hanging from the lower surface of each of these electrode plates to the lower side of the frame is provided. One of the switches is an outrigger floating alarm switch that closes the alarm circuit when the electrode plate contacts the lower limit contact, and the other of the switches closes the alarm circuit when the electrode plate contacts the upper limit contact. The switch is an outrigger squat alarm switch, and the lower end of the lever is slightly longer than the lever lower end of the outrigger squat alarm switch when the electrode plate of the outrigger float alarm switch contacts the upper limit contact. .

(Function) This device is attached to one leg of the outriggers on both sides of the UNIC crane or the top surface of the board by attracting this device with a magnet on one side. At this time, the lower end of the long lever of the outrigger levitation alarm switch is brought into contact with the ground, and the electrode plate of this switch is pressed against the ground so that the electrode plate of the switch comes into contact with the upper limit contact. Set up.
At this time, the lever of the outrigger subsidence alarm switch is short, and it does not touch the ground, leaving a slight gap.

When one of the outriggers of a unic car, to which this device is attached, floats from the ground, this device also rises together with the outrigger because it is integral with the outrigger. Therefore, the lever of the outrigger levitation warning switch and the electrode plate are lowered by the force of the spring because the resistance of the ground disappears, the electrode plate contacts the lower limit contact, the alarm circuit is closed, and the alarm sounds. When the other outrigger of the unic car lifts off the ground, the outrigger equipped with this device tilts or sinks in the opposite direction, whereby the lower end of the outrigger sinking warning switch lever is pressed against the ground and relatively moved. The lever is pushed up against the force of the spring, the electrode plate contacts the upper limit contact, the alarm circuit closes, and the alarm sounds. At this time, the long lever of the outrigger levitation alarm switch is pressed because the electrode plate is already in contact with the upper limit electrode, but the electrode plate does not move and the lower lever merely bends.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

A magnet block 2 having a concave portion 1 on one side is detachably fixed to one side of a box frame 3 and a dry battery 4, a power switch 5 and a buzzer 6 are provided inside the box frame 3. Further, an outrigger floating warning switch 7 and an outrigger sinking warning switch 8 are provided below the inside of the box frame 2. These buzzer 6, dry battery 4, power switch 5,
The outrigger float alarm switch 7 is connected in series, and the outrigger float alarm switch 8 is connected in parallel to the outrigger float alarm switch 7 to form a buzzer circuit. In this outrigger floating alarm switch 7, an upper limit contact 9 and a lower limit contact 10 are provided in opposition to each other, and a lever 11 penetrating them is made to project downwardly below the box frame 3 so that the upper limit contact 9 and the lower limit contact 10 are provided. The electrode plate 12 is fixed to the lever 11 between them, and the electrode plate 12 can come into contact with the upper limit contact 9 and the lower limit contact 10 by moving the lever 11 up and down. Also, the fixed frame 13 through which the upper part of the lever 11 penetrates and the electrode plate 12
A spring 14 is wound around the outer circumference of the lever 11 between and, and the electrode plate 12 is constantly in pressure contact with the lower limit contact 10 by the force of the spring 14. When the electrode plate 12 contacts the lower limit contact 10 in this manner, the buzzer circuit is closed.

The outrigger sinking warning switch 8 has the same structure as the outrigger floating warning switch 7,
It has a lever 15 having a length different from that of the lever 11. In this lever 15, the lever 11 is raised against the force of the spring 14,
When the electrode plate 12 contacts the upper limit contact 9, it is slightly shorter than the lower end of the lever 11. When the electrode plate 12 contacts the upper limit contact 9, the buzzer circuit is closed.

The lower ends of the lever 11 and the lever 15 are capped with caps 16 for preventing the levers from slipping into the soil.

The magnet block 2 is composed of an electromagnet, and when the magnet switch 17 is turned on, the magnet block 2 is excited and the outer peripheral surface becomes the attraction surface.

In the device constructed as described above, the magnet switch 17 is first turned on to excite the magnet block 2 in the place where the crane is used, and the concave bay portion 1 of the magnet block 2 is extended from one side of the unic car to one leg portion of the outrigger.
Attach by touching one side of the outer circumference of 18. The device is attached to the leg portion 18 by the attractive force of the electromagnet in the magnet block 2. At this time, as shown in FIGS. 2 and 3 (a), the lever 11 of the outrigger levitation warning switch 7 is pressed against the ground surface 19 to raise the lever 11 and resist the force of the spring 14 to the electrode. The plate 12 is kept in contact with the upper limit contact 9. Further, the lower end of the lever 15 of the outrigger sinking warning switch 8 is set to be slightly separated from the ground surface 19 as shown in FIGS. 2 and 3 (a).

The power switch 5 with the device installed in this way
Turn on.

When the unic crane loses balance due to the weight of the suspended load and the degree of overhang of the crane, and one of the outriggers with this device attached rises,
As shown in Figure (a), the outrigger floating alarm switch 7
The lower end of the lever 11 is separated from the ground 19, and the lever 11 descends by the force of the spring 14 so that the electrode plate 12 contacts the lower limit contact 10.
As a result, the buzzer circuit is closed and the buzzer 6 sounds.
When the other of the outriggers floats up, one with this device tilts or sinks, and as shown in FIG. 4 (b), the lower end of the lever 15 of the outrigger sinking warning switch 8 is on the ground.
When it abuts 19 and is further tilted, the lever 15 rises against the force of the spring 14, and the electrode plate 12 comes into contact with the upper limit contact 9. As a result, the buzzer circuit is closed and the buzzer 6 sounds. The crane operator can hear the sounds of these buzzers to know the lifting of the outrigger, stop the operation, and prevent the UNIC vehicle from tipping over.

Further, in the above-mentioned embodiment, this device is attached to the leg portion of the outrigger, but if a wide base (board) is laid at the lower end of the outrigger leg portion instead of this, the device is adsorbed on the base. Can be used. Of course, this device can be installed in an appropriate place as long as it is a magnetic absorbing material. Further, although the alarm device is the buzzer in the above embodiment, not only the alarm by sound but also the light may be turned on or blinked, or these may be combined.

(Effect of device) This device has the above-mentioned structure, and this device detects the lifting of one outrigger, which is the front sway of a fall of a UNIC vehicle, and gives an alarm to this so that the crane operator can immediately operate the crane. Can be stopped to prevent the UNIC vehicle from tipping over. The device of this invention is
If you attach it only to one outrigger, you can detect the uplift of both outriggers, which is extremely convenient. Furthermore, this device can be attached very easily to or around the outrigger by means of a magnet, does not have to be always attached to the outrigger, and can be attached at the site where the crane is used, and is easy to handle.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view showing a state of use of the present invention, FIG. 2 is a schematic configuration diagram of the present invention, and FIGS. 3 (a) and 3 (b) are respectively the present invention. Configuration diagrams of the outrigger levitating alarm switch and the outrigger sinking alert switch in the installed state of the device, and FIGS. 4 (a) and 4 (b) respectively show the configuration of the outrigger levitating alarm switch during the alarm of the device of the present invention. FIG. 5 and a configuration diagram of an outrigger subsidence alarm switch, and FIG. 5 are front views showing a usage state of a UNIC crane using the present invention. In the figure, 2 is a magnet block, 3 is a box frame, 4 is a dry battery, 6 is a buzzer, 7 is an outrigger floating alarm switch, 8 is an outrigger sink alarm switch, 9 is an upper limit contact, 10 is a lower limit contact, 11 Is a lever, 12 is an electrode plate, 14 is a spring, and 15 is a lever.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location E02F 9/08 A 9022-2D

Claims (1)

[Scope of utility model registration request] 1. An alarm circuit comprising a power source and an alarm device is provided in a frame having a magnet on one side, and two alarm switches are provided in parallel with each other, and each switch has an upper limit contact and a lower limit contact. Are provided so as to face each other, an electrode plate is provided that can freely move up and down between both contacts, and a spring that presses this electrode plate so as to always contact the lower limit contact is provided. A lever is provided, one of the switches is an outrigger levitation alarm switch that closes the alarm circuit when the electrode plate contacts the lower limit contact, and the other of the switches is the alarm when the electrode plate contacts the upper limit contact. The circuit is closed and the outrigger sinking warning switch is used.When the electrode plate of the outrigger floating alarm switch contacts the upper limit contact, the lower end of the lever is the outrigger sinking alarm. Characterized in that a configuration which is slightly longer than the lower end of the lever of use switch, fall prevention alarm system UNIC crane.