JP2537297Y2 - Mast storage mechanism for construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mast storage mechanism in a construction machine.

[0002]

2. Description of the Related Art An example of a conventional type will be described with reference to FIGS. In FIG. 5, reference numeral 11 denotes an upper slat, which is supported by a first-stage backstay 13, a second-stage backstay 14, and a third-stage backstay 15. The back stays 13 to 15 are telescopically connected so as to be telescopically extendable. When the upper slat 11 is lowered by contracting the mast telescopic cylinder 12, the back stays 13, 1 which telescopically expand and contract.
4 and 15 are contracted rearward while shrinking (see FIG. 8).

At the time of storage, the counter weight 1
Lower to the top of 6. Therefore, counter weight 1
6 is provided with a notch 17 for storing the mast.
(FIG. 7).

FIG. 9 shows a second conventional example. This is so that the first-stage backstay 19 is left as it is, the second-stage backstay 20 is bent toward the center of the machine, and the upper slat 18 falls (reference numeral 2 in FIG. 9).
0 '). Therefore, work in the intermediate mast state cannot be performed.

Further, in the example of FIG. 10, the first-stage backstay 23 and the second-stage backstay 24 are bent toward the counterweight side (outside) to store the mast. The third stage backstay 25 (lower stage) is fixed at the same position. Therefore, the operation in the intermediate mast state cannot be performed again (see Japanese Utility Model Application Laid-Open No. 64-77793).

[0006]

When the mast is stored (bent), the amount of movement of the backstay is large, so that the shape of the notch of the counterweight for storing the backstay is complicated and unstable. I was In view of such a problem, in order to simplify the shape of the counterweight, there is provided a mast storage mechanism capable of reducing the amount of movement of the backstay and enabling operation at an intermediate mast position. With the goal.

[0007]

Means for Solving the Problems Multistage backstays 3, 4 and 5 which are telescopic and can be fixed by fixing pins 9 for fixing the extension position, and lowermost backstays 6 are provided. The lower end of 6 is a rotation center pin 8
a, and the upper end of the lowermost backstay 6 is connected to the lower end of the multistage backstay by the rotation center pin 7a and the rotation preventing pin 7. Further, the multistage backstays 3, 4, and 5 have a pin insertion hole for fixing an intermediate mast position in addition to a pin insertion hole for fixing an extended position.

[0008]

[Operation] At the upper end and lower end of the lowermost backstay 6,
In addition to the rotation center pin 7a and the rotation center pin 8a, detachable fixing pins 7 and 8 for preventing rotation are provided, and a fixing pin 9 for fixing the extension position of the telescopic backstay.
A pin insertion hole for setting an intermediate mast position is provided outside of the pin insertion hole, and the fixing pin 8 is pulled out. When the pin is inclined to a predetermined position, the fixing pin 9 is inserted into the pin insertion hole for setting the intermediate mast position. . At this time, since the fixing pin 7 is still inserted, the back stay 6 and the multistage back stays 3, 4,
Since 5 is straight, an intermediate mast position can be formed.

[0009]

Embodiments will be described with reference to FIGS. 1 is an upper slat and 2 is a mast telescopic cylinder. 3 is 1
A stage backstay, 4 is a second stage backstay, 5 is a third stage backstay, and 6 is a lowermost stage backstay.

First stage backstay 3 and second stage backstay 4, second stage backstay 4 and third stage backstay 5
Are extended positions fixed by fixing pins 9, respectively. The lowermost backstay 6, like the third-stage backstay 5, is fixed by fixing pins 7. Reference numeral 10 denotes a counter weight. 7a is a rotation center pin provided near the fixed pin 7,
The third-stage backstay rotates with respect to this relative to the lowermost backstay 6. The third-stage backstay 5 into which the rotation center pin 7a and the fixing pin 7 are inserted is fixed in position with respect to the lowermost backstay 6. When the fixing pin 7 is removed,
It becomes rotatable around the rotation center pin 7a.

Reference numeral 8a denotes a rotation center pin provided in the vicinity of the fixing pin 8. When the fixing pin 8 is removed, the lowermost backstay 6 can rotate around the rotation center pin 8a with respect to the machine body.
When the fixing pin 8 and the rotation center pin 8a are both inserted, the lowermost backstay 6 is fixed to the machine body to maintain the upright position, and when the fixing pin 8 is removed, the rotation center pin 8a is
, The lowermost backstay 6 is rotatable with respect to the machine body.

[0012]

[Function] 1) When the mast is stored: First stage backstay 3, second stage backstay 4, second stage backstay 4, and third stage backstay from the normal mast state where the backstays are all extended as shown by the solid line in FIG. 5 and the fixing pin 7 connecting the lower end of the third-stage backstay 5 and the upper end of the lowermost backstay 6 are removed. The fixing pin 8 at the lower end of the lowermost backstay 6 remains the same. The mast telescopic cylinder 2 is contracted. The first to third backstays 3 to 5 are contracted, and the upper strut 1 falls down and is stored on the counter weight 10.

2) Intermediate mast state: From the normal mast state, the fixing pins 9 connecting the first and second stages, the second stage and the third stage, and the respective backstays are removed. The fixing pin 8 connecting the lowermost backstay 6 and the body is removed, and the rotation center pin 8a is pivoted about the rotation center pin 8a. The fixing pin 7 connecting the third stage and the lowermost backstay 6 remains as it is. The mast telescopic cylinder 2 is contracted. The first-stage backstay 3 to the third-stage backstay 5 are contracted, and are inclined rearward (counter-weight side) together with the lowermost backstay 6 around the rotation center pin 8a (FIG. 2A). . The mast telescopic cylinder 2 is stopped at a pin insertion hole (not shown) provided at an arbitrary inclined position (an intermediate mast position between the first-stage backstay to the third-stage backstay. The intermediate position of the backstay is fixed by inserting it into the pin insertion hole provided for the intermediate mast position of the third-stage backstay.

[0014]

(1) The fixing pin 9 insertion hole for fixing the extension position and the intermediate position of the telescopic backstay and the rotation center pins 7a above and below the lowermost backstay 6 as described above.
In addition to the fixing pins 7 and 8a, fixing pins 7 and 8 are provided so that the storage and the intermediate position state can be formed. Therefore, 1) The shape of the mast in the stored state is simplified, so that the shape of the counter weight in the portion where the mast is stored can be simplified, and the cost can be reduced. 2) In addition to the rotation center pin, fixed pins 7 and 8 that can be inserted and removed are provided above and below the lowermost backstay 6, and fixed pins different from the extended fixing pins are inserted into the telescopic type backstays. By providing a hole and inserting the fixing pin 9 into this hole, the intermediate mast state can be easily achieved, and work in this state is also possible. 3) Since the structure is simplified, there is no need to put the counterweight in small pieces, so that the stability of the counterweight is improved, and the counterweight does not sway and is safe. Also improve.

[Brief description of the drawings]

FIG. 1 shows a mast storage mechanism according to the present invention.

FIG. 2A shows an intermediate mast position, and FIG. 2B shows a state when the mast is stored.

FIG. 3 is a plan view of the counter weight as viewed in the direction of the arrow IV in FIG. 1;

FIG. 4 is a front view of the counterweight as viewed in the direction of the arrow III in FIG. 1;

FIG. 5 shows a known mast storage device.

FIG. 6 is a view taken in the direction of arrow VI in FIG. 5;

FIG. 7 is a view taken in the direction of arrow VII in FIG. 5;

FIG. 8 is an explanatory view of a mast storing mechanism of FIG. 5;

FIG. 9 is an explanatory view of another mast storage mechanism.

FIG. 10 is an explanatory view of yet another mast storage mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Upper slat 2 Mast telescopic cylinder 3,4,5 1st to 3rd stage backstay 6 Lowermost stage backstay 7,8,9 Fixing pin 7a Rotation center pin 8a Rotation center pin 10 Counter weight 11 Upper slat 12 Mast telescopic cylinder 13,14,15 1st to 3rd stage backstay 16 Counter weight 17 Notch 18 Upper slat 19 1st stage backstay 20 2nd stage backstay 21 3rd stage backstay 22 Upper slat 23-25 1st to 3rd stage backstay

Claims (1)

(57) [Scope of request for utility model registration] 1. A multi-stage backstay which is telescopic and can be fixed by a fixing pin (9) for fixing an extended position.
(3, 4, 5) and the lowermost backstay (6). The lower end of the lowermost backstay (6) has a rotation center pin (8a) and a detachable fixing pin (8) for preventing rotation. The upper end of the lowermost backstay (6) is also connected to the lower end of the multistage backstay by a rotation center pin (7a) and a fixing pin (7) for preventing rotation. A mast storing mechanism for a construction machine, wherein the back stays (3, 4, 5) have a pin insertion hole for fixing an intermediate mast position in addition to a pin insertion hole for fixing an extended position.