JPH0442319Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a structure in which a suspension member such as an upper hook is pivotally supported on the main body of the hoisting machine in a suspension type hoisting machine.

[Conventional technology and problems]

Conventionally, in order to pivotally support a hanging member such as an upper hook on the hoisting machine body of a suspension type hoisting machine, a hoisting member is attached between a pair of side plates that are erected at a predetermined distance from the hoisting machine body. It is known to insert members and insert transverse pivot pins through the side plates and suspension members. In order to prevent the pivot pin from coming off, the pivot pin is provided with a head, and a split pin is attached to the leg end of the pin inserted from one side plate. However, in this case, if the cotter pin falls off due to vibration or other external force, the pivot pin can be easily pulled out.
There is a problem in that the suspension member and the side plate become uncoupled.

Therefore, in recent years, it has been proposed that the pivot pin is restrained in the retaining direction by a retaining piece, and the retaining piece is fixed to the hoist main body side with screws or the like. However, even in this case, there is a risk that the screws may loosen and fall off due to vibration or other external forces, and once the screws have come off, the retaining piece will fall off freely and the pivot pin will easily be pulled out and fall off. There's a problem.

[Means to solve the problem]

The present invention provides a safe pivot structure that solves the above-mentioned problems by configuring a device equipped with a retaining piece as described above so that the retaining piece does not easily fall off from the hoisting machine main body side. The means for this purpose is to insert a suspension member between a pair of side plates erected at a predetermined distance from the main body of the hoisting machine, and to insert a suspension member through both side plates and the suspension member. In a structure in which a horizontally oriented pivot pin is inserted: A bag-shaped recess is provided on the hoisting machine main body side to receive the insertion end of the pivot pin protruding from the one side plate, and A retaining piece is provided that intersects with the proximal end of the protruding pivot pin and engages with the end surface of the proximal end; the retaining piece is provided with a downwardly directed retaining piece, while an upwardly facing retaining piece is provided on the hoisting machine main body side. The locking member is provided with a locking portion that opens into the locking portion, and the locking piece is fitted into the locking portion.

〔Example〕

An embodiment of the present invention will be described in detail below based on the drawings.

1 and 2, an electric chain block is illustrated as a suspension type hoist, and 1 is a motor with a brake, 2 is a load sheave section, 3 is a speed reducer section, and 4 is a control section. constitutes the "hoisting machine main body side".

Reference numeral 5 designates an upper hook, which has a connecting fitting 6 at its lower end, and the connecting fitting 6 is pivotally supported on the hoist main body side by a pivot pin 7, which will be described later. Therefore, these upper hooks 5 and connecting fittings 6 constitute a "hanging member" for the "hoisting machine main body side". In this example,
Although a structure in which the connecting metal fitting 6 is pivotally supported on the pivot pin 7 is shown, the same effect can be achieved even if the connecting metal fitting 6 is omitted and the base of the upper hook 5 is directly supported on the pivot pin 7.

In the figure, 8 is a load chain, 9 is a chain bucket of the free side chain, and 10 is a lower hook.

As shown in FIG. 3, on the "hoisting machine main body side", a pair of side plates 11a and 11b are provided on both sides of the load sheave section 2, and a pivot pin is provided on the upright portion of each side plate that projects upward. Pivot hole 1 passing through 7
2a and 12b are opened concentrically with the same diameter. One of the side plates 11a is provided with a bag-shaped recess 13 that receives the insertion end of the pivot pin 7 protruding from the pivot hole 12a in an abutting manner. In the illustrated example, a peripheral wall 14 is made to stand up from the housing of the motor 1 with a brake, and a bag-shaped recess 13 is formed in the peripheral wall. Further, as shown in FIGS. 3 to 5, on the other side plate 11b, a circumferential wall 15 raised from the housing of the reducer section 3 is arranged in an overlapping manner via a packing 15a, and the circumferential wall 15 is , in the portion of the side plate 11b facing the pivot hole 12b, the side plate 11b
It is curved backward to form a gap 16,
A pivot hole 15b having the same diameter and concentricity as the pivot hole 12b is provided in the curved portion. Note that the gap 16 opens upward, thereby forming a locked portion to be described later. The retaining piece 17 is made of a metal plate that overlaps the curved portion of the peripheral wall 15 from the outside and closes the pivot hole 15b, and has an upper part bent in an inverted U shape to form a downward locking piece 18. ing. Therefore, by fitting the locking piece 18 into the locked portion 16,
The retaining piece 17 overlaps the curved portion of the peripheral wall 15. In this state, the retaining piece 17 is attached to the peripheral wall 1 by the bolt 19.
It is removably screwed into the female screw hole formed in 5.

The connecting fitting 6 is formed by bending a metal plate into a gate-shaped cross section, and is fixed to the lower end of the upper hook 5 via a bolt 20. A pair of gate-shaped leg pieces of the connecting fitting 6 are inserted between the above-mentioned pair of side plates 11a and 11b, and have a pivot hole 6 through which the pivot pin 7 is inserted.
We have opened a and 6b.

The pivot pin 7 is connected to a pair of side plates 11a and 11b.
is inserted into the pivot holes 12a, 12b of the connecting fitting 6, and in the state of being inserted into the pivot holes 6a, 6b of the connecting fitting 6, the insertion end is abutted against the bag-shaped recess 13, and the proximal end surface is attached to the pivot hole of the peripheral wall 15. The length is set to approximately match the opening edge of the hole 15b.

With the pivot pin 7 inserted in this manner, if the downward locking piece 18 of the retaining piece 17 is inserted into the locked portion 16, the proximal end surface of the pivot pin 7 will be secured by the retaining piece 17. The fixing of the retaining piece 17 is completed by being restrained so that it cannot be pulled out, and further screwing the retaining piece 17 onto the peripheral wall 15 with the bolt 19. Therefore, in the unlikely event that the bolt 1 is damaged due to severe vibration or other external force,
Even if the locking member 9 becomes loose, the retaining piece 17 fits and locks the locking piece 18 to the locked portion 16, so that it will not fall off. In other words, the retaining piece 17 does not fall off unless it is pulled upwards, and the retaining piece 17 reliably prevents the pivot pin 7 from coming off.

[Effect of idea]

As a result of the above-mentioned structure of the present invention, in a structure in which the pivot pin 7 is limited to one direction, the pivot pin 7 is locked in a downward direction by the retaining piece 17 that prevents the pivot pin 7 from coming out. forming a piece 18;
Since the locking piece 18 is fitted into the upper opening locked portion 16 formed on the hoist main body side, the locking piece 17 will not fall off accidentally, and the pivot pin 7
This has the effect of ensuring that the material does not come off and improving safety.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a suspension type hoist using the present invention, Fig. 2 is a side view of the same, Fig. 3 is an enlarged cross-sectional view taken along the - line in Fig. 2, and Fig. 4 is a cross-sectional view of the FIG. 5 is a plan view corresponding to FIG. 4; FIG. 6 is an enlarged cross-sectional view showing the main portion of FIG. 3 in a different section; FIG. The figure is a rear view of the retaining piece, and FIG. 8 is a sectional view taken along the line -- in FIG. 7. 2...Load sheave part (hoisting machine main body side), 5...
...Top hook, 6...Connecting metal fittings, 7...Pivot pin,
11a, 11b... side plate, 6a, 6b, 12a,
12b, 15b... Pivot hole, 13... Bag-shaped recess,
16...Locked part, 17... Removal prevention piece, 18... Locking part.

Claims (1)

[Scope of utility model registration request] In a structure in which a suspension member is inserted between a pair of side plates erected at a predetermined interval on the hoisting machine main body, and a horizontal pivot pin is inserted through the both side plates and the suspension member: A bag-shaped recess is provided on the hoisting machine main body side to receive the insertion end of the pivot pin protruding from one side plate in an abutting manner, and a bag-shaped recess is provided on the hoisting machine main body side to receive the insertion end of the pivot pin protruding from the other side plate. A locking piece that engages with the end face of the end portion is provided; a locking piece facing downward is provided on the locking piece, and a locked portion opening upward is provided on the hoisting machine main body side, and the locking piece is covered with the locking piece. A pivot structure for a hanging member in a suspension type hoist, characterized in that the suspension member is fitted into a locking portion.