JPH10245190A - Tension rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply prevent a jig from falling down rearward when used, and also prevent the revolution radius of a car body from being increased, and from interfering with the irradiation range of a head light when housed in. SOLUTION: A tension rod 1 is provided with a slide groove 15 extended along its longer direction, is connected with a connecting member 1b by way of a connecting pin 70 capable of being slid along the slide groove 15 of the connecting member 1b, and is equipped with a rod main body 1a to be mounted to the tip end of a boom 50. The rod main body 1a is provided with a back stopper pin 10 capable of abutting against the connecting side end face 13 of the connecting member 1b in a state that the connecting pin 70 is positioned at the rear end of the slide groove 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension rod for applying a projecting force to a jib which supplements the length of a boom mounted on a crane truck or the like.

[0002]

2. Description of the Related Art Generally, a self-propelled crane has a jib for supplementing the length of a telescopic boom. This jib is used in a state that it protrudes toward the end of the boom.At this time, the tip of the jib and the end of the boom are connected by a pair of tension rods, and the tension is applied to the jib by these tension rods. Is done.

[0003] When the jib is not used, it is stored along the longitudinal direction of the boom. Jib storage methods include:
Conventionally, two methods are known. That is, there are a method of storing the jib along the lower surface of the boom, and a method of storing the jib along the side surface of the boom. On the other hand, the tension rod is also stored along the longitudinal direction of the boom similarly to the jib.

FIG. 8 shows an example in which the jib and the tension rod are stored along the length of the boom. In the figure,
102 is a boom, 106 is a jib, and 108 is a tension rod. As shown, the jib 106 is connected to the jib body 1.
06a and a pair of legs 106b, 106b extending from the jib body 106a. The pair of legs 106b, 106b form a proximal end of the jib 106 connected to the distal end of the boom 102, and extend outward in a bifurcated manner toward the proximal end of the jib 106.
That is, the jib 106 is formed so as to be tapered from its proximal end toward its distal end. Also, the tension rod 10
8 has a distal end 108a connected to the distal end of the jib 106 (the end of the jib body 106a) and a proximal end 108b connected to the distal end of the boom 102.

[0005] In the self-propelled crane 100 shown in FIG. 8, during traveling, the boom 102 is tilted down to the lower side of the cab 104. By arranging the boom 102 below the cab 104 in this manner, a sufficient lateral field of view during traveling can be ensured, and the center of gravity of the vehicle body can be lowered, so that the stability of the vehicle body during traveling can be improved.
Therefore, in the case of this type of self-propelled crane 100, in order to secure a view from the cab 104 during traveling or work and to prevent interference between the road surface and the jib 106 during traveling, the jib 106 is as shown in the figure. The boom 102 is positioned vertically with its base end directed toward the distal end side of the boom 102 and its distal end directed toward the base end side of the boom 102, and whose upper and lower surfaces are substantially parallel to the side surfaces of the boom 102 when overhanging. Is stored along the sides. Further, a pair of tension rods 108, 1 for applying a projecting tension to the jib 106 are provided.
08 is stored laterally (along the upper surface of the jib 106) of the jib 106 stored in the manner described above. Also in this case, the tension rod 1 connected to the tip of the boom 102
08 is directed toward the distal end of the boom 102, and the tension rod 10 is connected to the distal end of the jib 106.
8 is directed toward the base end of the boom 102.

[0006]

By the way, the tension rod generally has a longer overall length than that of the jib because it is necessary to connect the tip of the jib and the tip of the boom to apply a projecting force to the jib.

Therefore, when the tension rod is stored along the length of the boom, the end of the tension rod projects from the end of the jib. In other words, referring to FIG. 8 as an example, the base end 108 of the tension rod 108
b protrudes forward from the base end of the jib 106.

If the end of the tension rod protrudes forward of the vehicle body beyond the end of the jib, the protruding end of the tension rod may interfere with an obstacle during traveling. In particular, when the turning radius of the vehicle body is increased by the protruding end of the tension rod, it is difficult to make a right or left turn in a narrow alley. In the type in which the jib 106 and the tension rod 108 are stored on the side of the boom 102 as shown in FIG. 8, the tension rod 108 is hidden behind the boom 102 and cannot be seen from the cab 104.
It is difficult to check the left front (in the case of the illustration), and it is not easy to prevent the interference between the end of the tension rod 108 and the obstacle before it occurs. Of course, this is the case in Figure 8
The present invention is not limited to the self-propelled crane of the type described above, but also applies to a crane vehicle that runs with the boom laid down on the upper side of the cab. This is true not only when the jib is stored along the side of the boom, but also when the jib is stored along the bottom of the boom.

Further, in particular, in the type shown in FIG. 8 in which the boom is tilted down to the lower side of the cab, the protruding end of the tension rod enters the irradiation range of the headlight, and the light is shaded. May be created. Therefore, there is a concern about danger during night driving.

The problem described above is described in Japanese Patent Laid-Open No. 7-18 / 1995.
The problem will be solved if the tension rod is configured to be bendable as shown in Japanese Patent Application Laid-Open No. 7574, Japanese Utility Model Application Laid-Open No. 8-1562, or Japanese Utility Model Application Laid-Open No. 62-103594. That is, if the tension rod is divided into two parts and the divided rod parts are rotatably connected to each other, and when the storage part is retracted, the tension rod is rotated and folded at the connection part to shorten the entire length, so that the tension rod becomes a jib. It can be prevented from protruding forward from the end.

However, when the tension rod is configured to be rotatable about the connecting portion, one problem occurs.
In other words, when lifting a load through a jib that protrudes from the end of the boom, only the tensile force normally acts on the jib and the tension rod that applies a protruding force to the jib. If you land suddenly (not only in this case), the pulling force that has been acting on the tension rod will be suddenly loosened, and the direction of the pulling force will be opposite to the direction in which the pulling force has been acting due to the recoil caused by the so-called tilting phenomenon. , The tension rod may receive a force in the direction, and the tension rod may rotate around the connecting portion. As a result, it is conceivable that the jib falls to the rear side, causing large vibrations on the vehicle body and interference between the jib and an obstacle. In particular, the possibility is high when the jib is raised up to an angle close to the upright state together with the boom. JP-A-7-18
In the tension rod disclosed in Japanese Patent Application Laid-Open No. 7574 and Japanese Utility Model Application Laid-Open No. 8-1562, such a problem may occur because the divided rod portions are simply connected rotatably. In contrast, Shokai Sho 62-10
In the configuration disclosed in Japanese Patent No. 3594, since the rotation at the connecting portion of the tension rod can be restricted by the pin separately attached to the tension rod, the tension rod can be inverted due to the tilting phenomenon. Can be prevented. However, in this case, a separate pin must be inserted and removed from the tension rod, which makes the operation very complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the jib from falling down to the rear side during use without complicated work. It is an object of the present invention to provide a tension rod which does not increase the interference and does not interfere with the irradiation range of the headlight.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a crane device in which the front end of a boom and the front end of a jib protruding forward of the boom are connected to each other to apply a projecting tension to the jib. A tension rod having a slide groove extending along the longitudinal direction thereof, and a coupling member attached to the tip side of the jib, and a coupling pin slidable along the slide groove of the coupling member. A rod body connected to a member and attached to a tip of a boom, wherein the rod body has a back stopper pin that can abut on a connection-side end surface of the connection member in a state where the connection pin is positioned at an end of a slide groove. It is characterized by having.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4A shows a state in which the jib 30 is extended forward of the boom 50 using the pair of tension rods 1 and 1 according to one embodiment of the present invention.

As shown, the tension rod 1 comprises a long rod body 1a and a connecting member 1b connected to the rod body 1a. The jib 30 is connected to the jib body 3.
0a and a pair of legs 3 extending from the jib body 30a.
0b and 30b. A pair of legs 3
Reference numerals 0b and 30b constitute a base end of the jib 30 connected to the boom head 52 of the boom 50, and extend outward in a bifurcated manner toward the base end of the jib 30 (FIG. 7 also). reference). In other words, the jib 30 is tapered from its base end toward its distal end, and has a generally flat, substantially V-shaped (ladder-like) shape. In addition, each leg 30b, 30b
Is formed as a fork-like engaging portion 34 that extends bifurcated.

A sheave block 38 having a sheave 37 is provided at the tip of the jib 30 (the tip of the jib body 30a). A jib hoist cylinder 60 is rotatably mounted on the upper surface of the jib body 30a. Telescopic rod 60a of this jib hoisting cylinder 60
Is fixedly connected to the connecting member 1b of each tension rod 1, 1.

An engagement member 33 is provided on the upper surface on the distal end side of each of the legs 30b, 30b so as to be detachably engaged with the connecting member 1b of each of the tension rods 1, 1. On the base-side upper surface of each of the legs 30b, 30b, a fixing portion 31 that can be connected to the base of the rod body 1a of each of the tension rods 1, 1 is provided. In this fixed part 31,
An insertion hole 31a into which the fixing pin is inserted is provided.
Each leg 30 located between the engaging member 33 and the fixing portion 31
b, 30b, each leg 30b, 3
A support 32 for fixedly supporting the tension rods 1 and 1 is provided along the upper surface of Ob.

As shown in FIG. 1, the rod body 1a of the tension rod 1 has a distal-side connecting portion 2 connected to a connecting member 1b and a proximal-side connecting portion 3 having a pin hole 4 at both ends thereof. ing. As shown in FIG.
It is formed by a pair of side plates 5 and 5 facing each other and a bottom plate 9 as a reinforcing plate connecting the side plates 5 and 5 to each other. A through hole 6 is formed at an end of each side plate 5, 5. In this case, the through holes 6, 6 formed in the side plates 5, 5 are located opposite to each other. Further, a back stopper pin 10 is provided on the hand side of the through hole 6, and the back stopper pin 10 extends through the side plates 5, 5 and across the space between the side plates 5, 5.

As shown in FIG. 3, the connecting member 1b includes a main body 11 connected to the distal end side connecting portion 2 of the rod main body 1a,
An engaging portion 12 extending downward from a distal end portion of the main body 11 and being engaged with an engaging member 33 of the jib 30; and a connecting portion provided at the distal end of the main body 11 and connected to a rod 60a of a jib hoisting cylinder 60 16. A slide groove 15 is formed in the main body 11 along the longitudinal direction. Also,
The engaging portion 12 is provided with an engaging pin 14 which can be engaged with an engaging groove 33a (see FIGS. 4 and 5) provided in the engaging member 33 of the jib 30.

The connection between the rod body 1a and the connecting member 1b is performed with the main body 11 of the connecting member 1b positioned between the side plates 5 and 5 of the rod body 1a, and the through hole 6 of one of the side plates 5 is provided.
The connection pin 70 (see FIGS. 4 and 5) penetrates through the slide groove 15 and the end of the connection pin 70 that has passed through the slide groove 15 is inserted into the through hole 6 of the other side plate 5 to prevent the slide pin 15 from coming off. It is done by doing. In this case, the connecting pin 70 is rotatably attached.

In such a connected state, the slide groove 15
By sliding the connecting pin 70 along the axis, the rod body 1a can be moved relative to the connecting member 1b, and by rotating the connecting pin 70 in the slide groove 15, the rod body 1a can be connected to the connecting member 1b. 1b. In this connection state, when the main body 11 of the connecting member 1b and the rod main body 1a are arranged substantially in a straight line with the connecting pin 70 positioned at the base end 19 of the slide groove 15, the base end face of the main body 11 1
3 comes into contact with the back stopper pin 10 of the distal end side connecting portion 2 (see FIG. 4A).

By the way, in the jib overhang state shown in FIG. 4A, the engaging portions 34 of the legs 30b, 30b of the jib 30 are provided.
Is locked to the support portion 60 of the boom head 52 and the jib 30
And the tip of the boom 50 are connected by a pair of tension rods 1,1. In this case, in each of the tension rods 1, 1, the connecting portion 16 of the connecting member 1b is connected to the rod 60a of the jib hoisting cylinder 60, and the proximal connecting portion 3 of the rod body 1a is connected to the mounting portion 51 of the boom head 50. It is in the state connected to. The connection between the base-side connecting portion 3 and the mounting portion 51 is performed by matching the pin holes 4 of the base-side connecting portion 3 with the pin holes of the mounting portion 51 and fixing the fixing pins 4 to these holes.
This is done by attaching 0.

In such an extended state, since the tension rods 1 and 1 are pulled by the weight of the jib 30, the connecting pin 70 is located at the base end 19 of the slide groove 15 and is connected to the main body 11 of the connecting member 1b. The rod body 1a is in a linear state arranged substantially coaxially. Therefore, the base end surface 13 of the main body 11 of the connecting member 1b abuts on the back stopper pin 10 of the distal end side connecting portion 2 of the rod main body 1a (this makes it impossible to slide the connecting pin 70 along the slide groove 15). , Rod body 1 with respect to connecting member 1b
The relative movement of a is prevented. ), The tensioned state (linear state) of the tension rods 1, 1 is firmly held.
In other words, when the tension force acting on the tension rods 1 and 1 is suddenly loosened by suddenly landing the load lifted via the jib 30, the reaction force (pulling force) caused by the lifting phenomenon occurs. (A force in a direction opposite to the force) acts on the tension rods 1, 1, but this reaction force is received by the back stopper pin 10 via the base end surface 13 of the main body 11 of the connecting member 1 b. Therefore, the connecting member 1b does not rotate with respect to the rod body 1a (this rotation depends on the degree of reaction force, but the main body 11 of the connecting member 1b and the bottom plate 9 of the rod body 1a abut against each other. This also prevents the jib 30 from falling backward (backstop function).

The rod 6 of the jib hoisting cylinder 60
In the state shown in FIG. 4A where 0a is most contracted and the jib 30 is set to the minimum offset angle, the engagement of the engagement member 33 of the jib 30 is performed to prevent the rotation of the cylinder 60 and the connecting member 1b. The engaging pin 14 of the connecting member 1b engages with the groove 33a. Further, when the rod 60a of the jib hoisting cylinder 60 is extended from this state, the engagement between the engagement pin 14 and the engagement groove 33a is released, and the mounting angle of the tension rods 1, 1 with respect to the jib 30 changes. The mounting angle of the jib 30 with respect to 50 changes.

In the state shown in FIG. 4A (a state in which the rod 60a is contracted most and the engaging pin 14 and the engaging groove 33a are engaged), the tension rods 1, 1 are moved along the upper surface of the jib 30. In the case of retracting, the fixing pin 40 is firstly pulled out to release the connection between the base end side connecting portion 3 of the rod body 1a and the mounting portion 51 of the boom head 50, and as shown in FIG. As shown, the rod body 1a is rotated about the connecting pin 70 with respect to the connecting member 1b. Thereby, the contact state between the base end surface 13 of the connecting member 1b and the back stopper pin 10 of the rod body 1a is released, and the slide groove 15 is released.
Can be slid along the connection pin 70.

In this state, the connecting pin 70 is pushed out of the sliding groove 1 by pushing the rod body 1a forward.
5, the connecting pin 70 is positioned at the distal end of the slide groove 15 (see FIG. 5A).
As a result, the base end of the rod body 1a is located more distally than the base end of the jib 30, and the base ends of the tension rods 1, 1 do not protrude from the base end of the jib 30.

Next, with the rod body 1a fully rotated with respect to the connecting member 1b, the rod body 1a is
And the tension rods 1 and 1 are fixedly supported on the jib 30 by being connected to the support 32 of the
Is fixed to the fixing portion 31 of the jib 30.
The fixing of the base-side connecting portion 3 and the fixing portion 31 is performed by aligning the pin hole 4 of the base-side connecting portion 3 with the insertion hole 31a of the fixing portion 31, and removing the fixing pin previously extracted into these holes 4 and 31a. This is accomplished by attaching the 40.

FIGS. 6 and 7 show that the boom 50 is
4, the jib 30 in which the tension rods 1 and 1 are stored in the state shown in FIG. 5B is stored along the side surface of the boom 50 in the self-propelled crane 90 which is tilted down to the lower side. FIG.

As shown, the jib 30 has its base end directed toward the distal end of the boom 50 and its distal end directed toward the base end of the boom 50. The boom 50 is stored along the side surface along the longitudinal direction of the boom 50 in this state. Therefore,
The tension rods 1, 1 stored in the jib 30 also have the base end (the base end side connection portion 3) of the rod body 1 a directed toward the distal end side of the boom 50, but the tension rods 1, 1 are connected to the rod body 1 a. Since the overall length is shortened by being relatively moved with respect to the member 1b, the jib 3
It does not protrude forward of the vehicle body beyond the zero end.

The jib 30 with respect to the side surface of the boom 50
Is detachably performed by a support (not shown) attached to the side surface of the boom 50. Such a support may have the same configuration as that of the related art. For example, the jib 30 can be stored along the side of the boom 50 when not in use, and along the side of the boom 50 when the jib 30 is used. The jig 30 stored in the boom 50 is temporarily transferred to the lower surface side of the boom 50, and then the jib 30 can be turned vertically below the boom 50 in a vertical direction. Jib 30 stored along
Is pivoted about the fulcrum to drop it below the tip of the boom 50, and a supporting tool (supporting mechanism) that allows the hung jib 30 to be twisted by a predetermined angle until it can be extended and then pulled up. Desirably. For that purpose, it is necessary to provide the jib 30 and the boom 50 with the elements constituting such a support mechanism.

In the present embodiment, the connecting member 1b of the tension rods 1, 1 is connected to the jib hoisting cylinder 60. However, the present invention is not limited to this. For example, the connecting member 1b is directly connected to the jib 30. Such a configuration may be adopted. This configuration can also achieve the object of the present invention of shortening the entire length of the tension rods 1, 1 while ensuring the backstop function.

As described above, the tension rod 1 of the present embodiment comprises the rod body 1a and the connecting member 1b, and the rod body 1a can slide forward with respect to the connecting member 1b and rotate. Therefore, the entire length can be shortened and stored in the jib 30 side. Therefore, it does not protrude forward of the vehicle body beyond the end of the jib 30. As a result, at the time of storage, the turning radius of the vehicle body does not increase, and there is no interference with an obstacle. Also, there is no interference with the irradiation range of the headlight. Needless to say, such an effect can be obtained not only in the self-propelled crane of the type shown in FIGS. 6 and 7 but also in a crane vehicle running with the boom laid down on the upper side of the cab. Further, the present invention can be obtained not only when the jib is stored along the side surface of the boom but also when the jib is stored along the lower surface of the boom.

Further, the tension rod 1 of the present embodiment
If the connecting pin 70 is positioned at the base end 19 of the slide groove 15 and the main body 11 of the connecting member 1b and the rod main body 1a are arranged in a substantially coaxial straight line, the base end face 1 of the main body 11
3 mechanically (automatically) comes into contact with the back stopper pin 10 of the distal end side connecting portion 2. And this state is firmly held by the tensile force accompanying the weight of the jib 30 at the time of use. That is, the tensioned state (linear state) of the tension rods 1 and 1 is firmly held without performing a separate and complicated operation such as inserting and removing a pin. Therefore, even if the tension force acting on the tension rods 1 and 1 is suddenly loosened by suddenly landing the load lifted via the jib 30 or the like, the connecting member is caused by the reaction force accompanying the lifting phenomenon. 1b does not rotate with respect to the rod body 1a. That is, it is possible to prevent the jib from falling down to the rear side without complicated work, and it is not necessary to cause a large vibration in the vehicle body.

[0034]

As described above, the tension rod according to the present invention can prevent the jib from falling down to the rear side during use without complicated work, and can increase the turning radius of the vehicle body or reduce the headlights during storage. There is no interference with the irradiation range.

[Brief description of the drawings]

FIG. 1 is a side view of a rod main body constituting a tension rod according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view of a connecting member constituting a tension rod according to one embodiment of the present invention.

FIG. 4A is a side view showing a state in which a jib is extended to the front of a boom using a tension rod according to an embodiment of the present invention, and FIG. 4B is a side view showing a state in which the tension rod is removed from the boom. FIG.

5A is a side view showing a state in which the entire length of the tension rod is shortened by sliding the rod body with respect to the connecting member, and FIG. 5B is a state in which the tension rod in the state of FIG. FIG.

FIG. 6 is a diagram illustrating a self-propelled crane in which the boom is tilted down to the lower side of the cab, and the jib in which the tension rod is stored in the state of FIG. 5B is stored along the side of the boom; It is a top view showing the state where it did.

FIG. 7 is a front view of the self-propelled crane of FIG.

8A and 8B show a conventional example in which a jib and a tension rod are stored along the side surface of a boom, wherein FIG. 8A is a plan view of a self-propelled crane, and FIG. 8B is a front view of the self-propelled crane of FIG. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tension rod 1a ... Rod main body 1b ... Connection member 10 ... Back stopper pin 15 ... Slide groove 70 ... Connection pin

Claims (1)

[Claims] 1. A tension rod for connecting a tip end of a boom of a crane device and a tip end of a jib protruding forward of the boom to apply a projecting force to the jib, wherein a slide groove extending along the longitudinal direction thereof. A connecting member attached to the tip end side of the jib, and a rod body connected to the connecting member via a connecting pin slidable along a slide groove of the connecting member, and attached to a tip of the boom. The tension rod, wherein the rod body has a back stopper pin that can abut on a connection-side end face of a connection member in a state where the connection pin is positioned at the end of a slide groove.