JPH0312840Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a single-rope type grab bucket used for excavation or cargo handling such as earth and sand.

(Prior Art) A conventional single rope type grab bucket cart is equipped with an upper box 1 as shown in FIGS. At the lower ends of these arms 2 and 3, a shaft 8 is attached to each closed end of a pair of shells 6 and 7.
It is supported by 9. One end of each shell 6, 7 on the opening side is pivotally supported to a lower box 10 by shafts 11, 12. A moving box 13 that moves up and down is provided between the upper box 1 and the lower box 10. A rope attachment part 14 is provided on top of the grab box 1, and the lower end of a single rope 15 for suspending and controlling this grab bucket is attached. Rope attachment part 1
4 and the moving box 13 are connected by a pair of connecting members 16 and 17 passing through the upper box 1. A pair of hooks 1 are provided on the lower box 10 so that the moving box 13 is connected to the lower box 10 when it is lowered.
8, 19 are pivotally supported by shafts 20A, 20B, and the upper ends of the hooks 18, 19 are supported by springs 2 in the opening direction.
1 and is energized. On the other hand, inside the moving box 13 are the hooks 18 and 1 that came into it.
A pair of locking members 22 and 23 for locking the locking member 9 are provided to protrude inwardly from the inner wall, and these locking members 2
Tapered surfaces 22A and 23A are provided on opposing surfaces of the hooks 2 and 23 so that the hooks 18 and 19 can easily pass through. The hooks 18 and 19 that have passed between the locking members 22 and 23 are locked onto the upper surfaces of the locking members 22 and 23. In order to maintain the locked state, a wedge-shaped latch lever 24 is inserted between the hooks 18 and 19 by its own weight. The latch lever 24 passes through holes 25 and 26 in the movie box 13, and one end is pivotally supported by a shaft 28 on a bracket 27 that projects from the outer surface of the box on the hole 25 side. One end of an operating rope 29 for operating the latch lever 24 is attached to the free end of the latch lever 24. After passing through a guide roller 30 supported by the upper box 1, the operating rope 29 is extended to an operating position.

Such a single rope type grab bucket is constructed by attaching a single rope 15 as shown in Fig. 1.
It is suspended in the. In this state, as shown in FIG. 4, the moving box 13 is lowered to grab the earth and sand 31, and when the shells 6 and 7 reach the earth and sand 31 and the single rope 15 becomes slack, the moving box 13 is lowered and the lower box is moved as shown in the figure. Fall on top of 10. At this time, the hooks 18 and 19 enter into the moving box 13, and the locking members 22 and
23. In such a state, the operating rope 29
When the latch lever 24 is loosened, the latch lever 24 falls under its own weight and is driven between the hooks 18 and 19, completing the connection between the moving box 13 and the lower box 10. After that, when the single rope 15 is pulled up, the moving box 13 and the lower box 10 are also pulled up.
With this movement, the earth and sand 31 are grabbed from the shells 6 and 7 and closed as shown in Figure 5. Next, Ciel 6,7
When removing earth and sand 31 from the
When pulled, the latch lever 24 is released as shown in FIG.
The free end side of is pulled up and comes out from between the hooks 18 and 19. In this state, Ciel 6,
Due to the weight on the side 7, the hooks 18 and 19 are released, the lower box 10 is lowered, and the shells 6 and 7 are opened as shown in FIG. 1, and the earth and sand 31 are ejected.

However, in such a conventional single rope type grab bucket, when the shells 6 and 7 are closed by grasping earth and sand 31 as shown in FIG. In the state shown, a large force acts to tighten the latch lever 24. In order to open the shells 6, 7 from this state, the latch lever 24 must be pulled up against the sliding friction force generated between the tapered surfaces 24a, 24a of the latch lever 24 and the back surfaces 18a, 19a of the surface hooks 18, 19. Further, in order to grip dirt and the like and maintain the closed state, the frictional force must be greater than the upward component of the force applied to the tapered surfaces 24a, 24a. Taking these conditions into consideration, we are working hard to select the angles of the tapered surfaces 24a, 24a. However, latch lever 2
The frictional force between the tapered surface of No. 4 and the hook changes depending on the weight of the grabbed dirt, etc., and also changes due to dirt, water, oil, etc. adhering to the tapered surface. The frictional force will fluctuate, and if the angle of the tapered surface is made too large, the latch lever may come off too easily, which can be dangerous.On the other hand, if the angle of the tapered surface is made small, the frictional force may become large when a heavy object is grabbed. There was a problem that it did not come off easily.

(Purpose of the invention) In consideration of the above-mentioned conventional problems, the present invention allows the latch lever to be easily pulled out from between the hooks even when a large amount of earth and sand is grabbed, and there is no risk of it coming off by itself, making it safe. The purpose of this invention is to provide a single rope type grab bucket with high performance.

(Structure of the invention) Therefore, the present invention is such that, in the conventional single rope grab bucket as described above, both sliding surfaces between the two hooks and the latch lever inserted between them are formed parallel to each other, and both the hooks or the latch lever are A roller with a protruding outer circumferential surface is rotatably provided on either of the latch levers, and the roller is configured to roll on a sliding surface when the latch lever moves in and out between the two hooks. Instead of stopping the latch lever between the hooks, the sliding surfaces between the latch lever and the hook are made parallel, and the rolling friction force of the rollers rolling on the parallel surfaces is used, and the latch lever is pulled up against this rolling friction force. The aim was to achieve the above objectives by doing so.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings. The single rope grab bucket according to the present invention has a latch lever 24 which passes through the moving box 13 and is pivoted at one end by a shaft 28, and is formed into a rectangular prism shape with a cross section as shown in FIG. Both sliding surfaces 24 are inserted between the hooks 19 and opposite the back surfaces 18a and 19a of both hooks.
a and 24a are arranged parallel to each other.

On the other hand, each of the hooks 18 and 19 has an outer circumferential surface protruding from its back surface, and a roller 32 is rotatably supported by a shaft 33. This roller 3
2 is attached via an air-liquid tight roller bearing 34. However, these two hooks 1
When the latch lever 24 is inserted between 8 and 19, only both rollers 32 are on both sliding surfaces 24a,
24a.

Note that, except for the shape of the latch lever 24 and the rollers 32 provided on both hooks 18 and 19, the structure is similar to that of the conventional single rope grab bucket bag described above.

In such a single-rope grab bucket, by pulling the operating rope 29, the roller 32 moves against the parallel sliding surface 2 of the latch lever 24.
4a, 24a, and the latch lever 24 is pulled up against the rolling friction force at that time.

In addition, although the above-mentioned embodiment shows the case where the roller is attached to the hook side, the present invention may also include a roller attached to the latch lever side.

The single rope grab bucket of the present invention is constructed as described above, and a roller is interposed between the sliding surfaces of both hooks and the latch lever, and the latch lever is removed when a lifting force greater than the rolling friction of this roller is applied. Unlike conventional levers, there is little variation in frictional force due to adhesion of oil, water, dirt, etc., and the frictional force is smaller than sliding friction, making it easier to remove the latch lever. be.

In addition, by arranging both sliding surfaces of the latch lever parallel to each other instead of tapered like in the past, even when a large amount of earth or sand is grabbed, no upward force is applied to the latch lever, allowing it to move freely. It is highly safe because it cannot be pulled out from between the hooks.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional single rope grab bucket cart, Fig. 2 is a vertical cross-sectional view showing the connection state of the lower box and moving box in the conventional grab bucket cart, and Fig. 3 is the same as that shown in Fig. 2.
4 to 6 are front views of the operating state of the single rope type grab bucket cart, and FIG. 7 shows the connected state of the lower box and moving box showing the main parts of the single rope type grab bucket cart according to the present invention. The longitudinal cross-sectional view shown in FIG. 8 is a cross-sectional view taken along the - line in FIG. 7. 1... Upper box, 2, 3... Arm,
6, 7...Ciel, 10...Lower Boxes,
13...Moving box, 14...Rope attachment part, 15...Single rope, 16, 17...
Connection member, 18, 19... Hook, 22, 23...
... Locking member, 24 ... Latch lever, 32 ... Roller, 33 ... Shaft, 34 ... Roller bearing.

Claims (1)

[Scope of utility model registration request] A pair of shells are rotatably suspended from the upper box via rotatable arms, one end of each shell on the opening side is rotatably supported by the lower box, and the lower box and the upper box A moving box is arranged between the lower box and the lower box, a pair of hooks are pivotally supported, and the moving box has a locking member that is locked when the hooks are opened in a direction away from each other. and a state in which each hook locked to each of the locking members is inserted between both hooks in order to prevent it from coming off from each of the locking members, and a state in which each of the hooks is inserted between the two hooks to prevent it from coming off from each of the locking members. A latch lever is provided at one end of the moving box and rotates up and down so that the latch lever can be pulled out from between both hooks, and a latch lever is attached to the lower end of the single rope at the top of the upper box. In a single rope grab bucket bag, the rope attachment part and the moving box are connected by a connecting member passing through the upper box. A roller having sliding surfaces parallel to each other and having an outer peripheral surface protruding from either the hooks or the latch lever is rotatably provided, and the roller rolls on the sliding surface when the latch lever moves in and out between the hooks. A single-rope type grab bucket that features the ability to