JPS641344Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crane vehicle, such as a truck crane, in which a crane safety device is attached to protrude from the base side wall of a telescoping boom on the crane driver's cab side.

In such crane vehicles, when changing the number of winch lines attached to the hook block or when attaching/detaching the jib to the tip of the telescopic boom, it is possible to accidentally connect the winch line when operating the winch to land the hook or hook block. This may occur not only when the winch is extended excessively, but also when the unloaded winch line is exposed to a gust of wind when the upright telescopic boom is fully extended and the hook or hook block is lifted near the tip of the boom, or when the unloaded winch line is exposed to a gust of wind, If the load suddenly decreases and the telescoping boom suddenly loses its deflection, the winch cable may hang down to the side of the telescoping boom and cause damage to the crane safety equipment.
There is a risk that the crane safety equipment may become caught on the underside and damage the winch line when tension is applied again. In addition, the crane operator must climb onto the fallen telescopic boom to replace the winch cable.

The present invention deals with this problem by relaxing a pair of U-shaped rods 2 and 3 that are located in planes intersecting the telescopic boom axis and sandwich at least a part 1 of the crane safety equipment. The winch rope is attached to the base of the telescopic boom 6 so as to cover the crane safety device equipment, and the winch rope hooked on the bottom portions 2a and 3a of the U-shaped rod is The space between the pair of U-shaped rods is tilted so as to climb over the U-shaped rods, and at the same time, when the derrick cylinder 7 is fully retracted, the worker can climb onto the collapsed telescopic boom from above the body 8 of the crane truck. It is characterized in that at least one horizontal bar 9 is attached to the.

An embodiment of the present invention will be described below with reference to the drawings.
Reference numeral 10 indicates an automobile driver's cab attached to the front end of the vehicle body 8 of the truck crane, 11 an outrigger attached to the lower surface of the vehicle body, 12 a swivel base mounted on the rear of the vehicle body 8 via a turntable, and 13 a swivel base 12.
It shows the crane operator's cab installed above, with the swivel platform 12
A telescopic boom 6 whose base end is pivoted above by a foot pin 14 has a base boom cylinder 15 that is lifted up by a derrick cylinder 7 whose one end is connected to the swivel base.
It consists of three boom tubes 16, 17, and 18 that are sequentially inserted into the base boom tube in a telescopic manner, and cargo handling work can be performed using the winch cable 4. 1
Reference numeral 9 denotes a jib detachably suspended from the lower side of the base boom tube 15, and the jib 19 can be attached to the tip of the tip boom tube 18 as needed to perform cargo handling work using the winch cable 5.

Base boom tube 1 on the crane operator's cab 13 side
The illustrated crane safety device equipment attached to the intermediate side wall of No. 5 is a boom length meter 20 that also serves as a cord reel for an overwind prevention device, and the output of a crane load detector (not shown) is detected by the boom length meter. It consists of an electrical or mechanical calculator 1 that issues a signal to stop the crane operation on the side where the crane overturning moment increases when a memorized value of allowable load according to the length and the detection angle of a boom inclination angle meter (not shown) is reached. but,
Crane safety equipment may be of any configuration. 2
Reference numeral 1 indicates a cord of the boom length 20, the tip of which is fixed to the tip of the tip boom tube 18.

The illustrated crane safety equipment is separated into a calculator 1 and a boom length meter 20, so it cooperates with a pair of U-shaped rods 2 and 3 that sandwich the calculator 1, and the U-shaped rod 3. The upper and lower sides of the U-shaped rod 22 with the same configuration sandwiching the boom length 20 are connected to the base boom tube 1, respectively.
At the computer mounting side end of the top plate of No. 5 and the lower end of the side wall adjacent thereto, the vertical rod portion 2b of each U-shaped rod,
3b etc. are welded so as to protrude laterally from the calculator 1, and the bottom portions 2a, 3a of each U-shaped rod are
etc., as shown in Figure 3. In FIG. 3, boom tubes other than the base boom tube 15 are omitted for the sake of simplification of the drawing. A horizontal bar 9 is placed between the U-shaped rods 2 and 3.
Further, horizontal bars 23 are welded in a ladder-like manner between the U-shaped rods 3 and 22, respectively, but the intervals between the horizontal bars 9 and 9 are as large as the horizontal bars 23 and 22, respectively.
greater than the interval of 23.

In the figure, 24 and 25 are guide pulleys for the winch cables 4 and 5 mounted on the swivel base 12, 26 is a guide for both winch cables mounted on the tip of the base boom tube 15, and 27 and 28 are intermediate guide pulleys for the winch cables 4 and 5, respectively. Boom tube 16, 17
29 is a hook block suspended from the winch cable 4, 30 is a hook suspended from the winch cable 5, and 31 is a crane with a hinge at the rear. Operator's cab door, 32 indicates a derrick cylinder connection fitting attached to the lower surface of the base boom cylinder 15, winch cable 4,
5 is paid out from the main winch and the auxiliary winch on the swivel base 12, respectively, as before.

According to the above configuration, in order to extend the jib 19 suspended and stored in the base boom tube 15 as shown in FIG. When the winch cable 5, which has been suspended and stored on the side wall of the base boom cylinder 15 opposite to the side where the crane safety equipment is installed, is to be replaced with the tip of the telescopic boom and the jib 19, the crane operator needs to climb onto the telescopic boom. In some cases, when the rear door 31 of the crane operator's cabin 13 is opened, the crane operator's cabin opens the ladder-shaped horizontal beam 9 between the U-shaped rods 2 and 3 or between the U-shaped rods 3 and 22 from above the vehicle body 8. Alternatively, the door 31 can be immediately climbed onto the telescopic boom using the
After the crane operator who opened it got down to the ground,
There is no need to climb onto the telescopic boom through the rear part of the swivel base 12, and climbing onto and descending from the telescopic boom becomes extremely easy.

When the jib 19 is extended or retracted, or when the number of hooks of the winch line 4 on the hook block 29 is changed, when the winch is operated to land the hook 30 or the hook block 29, the winch line 4 or 5 is If the winch cable is excessively extended from the winch, the middle part of the winch cable between the pulley 24 or 25 and the guide tool 26 becomes the bottom part 2a, 3a of the U-shaped rods 2, 3, etc.
Even if the winch rope hangs down until it engages with the U-shaped rods 2, 3, etc., when the winch rope is tensioned again by the winch, the middle part of the winch rope will hang down due to the slope of the bottom part. After overcoming this, the state returns to the state shown in Figure 3. Also, as shown in Figure 4, the telescopic boom 6 is erected.
When the winch line 4 or 5 is exposed to a gust of wind while the hook block 29 or the hook 30 is lifted to the vicinity of the tip of the boom, or when the load on the lifted load suddenly decreases during cargo handling operations. Even if the tip of the telescopic boom 6 suddenly loses its deflection, the intermediate portion of the winch cable will sag and strike the crane safety equipment 1, 20 or try to catch on the underside thereof; It is blocked by the U-shaped rods 2, 3, etc., and when tension is applied to the winch rope again, the winch rope climbs over the U-shaped rods as described above to prevent damage to the crane safety equipment. do.

Therefore, according to the present invention, it is possible not only to cover the crane safety device with a U-shaped rod to prevent damage to the winch cable intermediate part from hanging or a long object to be lifted. By using the U-shaped rod as a ladder, the crane operator can easily climb onto the retractable boom in the collapsed state, which has the effect of facilitating the work of replacing the winch cable.

[Brief explanation of the drawing]

Figure 1 is a side view of a truck crane equipped with the device of the present invention, Figure 2 is an enlarged view of its main parts, Figure 3 is a sectional view taken along line XX in Figure 2, and Figure 4 is a side view during cargo handling operations. It is. 1...Calculator, 12...Swivel base, 13...Crane operator's cab, 19...Jib, 20...Boom length meter, 22...U-shaped rod, 23...Horizontal beam.

Claims (1)

[Scope of utility model registration request] In a crane vehicle in which a crane safety device is mounted so as to protrude from the side wall of the base of a telescoping boom on the side of the crane operator's cab, at least part 1 of the crane safety device is located within a plane intersecting the telescopic boom axis. A pair of U-shaped rods 2 and 3 sandwiching the
is attached to the base of the telescoping boom 6 so as to cover the crane safety equipment against loosened winch cables, and the bottom part 2 of the U-shaped rod is
a, 3a are tilted so that the winch cable hooked thereto passes over the U-shaped rod, and when the derrick cylinder 7 is fully retracted, the worker lowers the telescopic boom from above the crane car body 8. A protection device for a crane safety device, characterized in that at least one horizontal beam 9 is attached between the pair of U-shaped rods so that the crane can be climbed on.