JPS6322494A - Lever type winding machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lever hoisting machine used for lowering and lowering cargo by operating a control lever.

2. Description of the Related Art Conventional devices of this type include, for example, Japanese Patent Publication No. 59-4339.
The one disclosed in Publication No. 8 is known. In the device disclosed in this publication, the drive member and the adjacent driven member are both screwed into threaded portions formed on the drive shaft, and the boss portion of the driven member protrudes toward the drive member. is fitted with a ratchet wheel that is sandwiched between friction plates on both sides. This ratchet wheel is locked to a ratchet pawl so that it can rotate only in the driving direction of the driven member, that is, in the winding direction of the load sheave, and is hooked onto the hook by repeatedly operating the operating lever in the left and right directions. The system is designed to intermittently lift and lower cargo.

Problems to be Solved by the Invention In the conventional device described above, when loading and unloading cargo,
The driven member screwed onto the drive shaft is fitted into its boss portion and comes into rotational contact with the fitting surface of the ratchet wheel which is engaged with the ratchet pawl. will be worn out. In order to eliminate this drawback, conventionally, the ratchet wheel has been subjected to heat treatment.

However, when heat treating a ratchet wheel, both sides of the ratchet wheel do not come into uniform contact with the friction plate due to the quenching strain that occurs on the side surfaces. There was an inconvenience that it had to be polished.

Means for Solving the Problems This invention has been made to solve the above-mentioned problems.The invention rotates a drive shaft by operating a control lever, and suspends cargo through a load sheave attached to the drive shaft. In a lever-type winding machine that moves the lower hook in the -L downward direction,
A pressing member is fitted to the outer periphery of the boss portion of the driven member, and friction members are provided on both sides of the boss portion of the pressing member to be fitted over the boss portion, and a mold wheel is provided between the friction member on the driven member side and the side surface of the pressing member. is installed, and an engaging uneven part for connection is provided in the radial direction on the inner circumferential surface of the hole of this model wheel and the outer circumferential surface of the boss part of the pressing member for connection to allow slight movement of both in the rotational direction. It is something.

Function Since the present invention has the above-described configuration, when lifting or lowering a load by operating the operating lever, the mold wheel fitted to the boss portion of the pressing member is directly connected to the driven member that rotates together with the drive shaft. The inner circumferential surface of the hole in the mold wheel is not subject to wear and tear due to the boss of the pressing member, since it is connected to the pressing member by the engagement uneven portion that is allowed to move slightly in the rotational direction. I will no longer receive it.

Embodiment In FIG. 1, a load sheave 3 is rotatably held in the center of side plates 1.2 that are kept at a constant interval. Reference numeral 4 denotes a drive shaft that is integrally attached to the load sheave 3, and the drive shaft 4 has a right-handed thread 4a on a shaft portion protruding from one side plate 2. A driven member 5 is screwed into the drive shaft 4 on the side closer to the side plate 2, and a drive member 6 having a switching gear 6a is screwed on the side farther from the side plate 2.

A pressing member 7 is fitted into the boss portion 5a of the driven member 5 between the driven member 5 and the driving member 6, and the pressing member 7 is molded into the boss portion 7A of the five driven members. A wheel 8 and a friction member 9 are attached, and a friction member 10 is attached to a boss portion 7A of six drive members. As shown in FIG. 3, the mold wheel 8 has three engaging recesses 8a formed in the radial direction at equal intervals on the inner circumferential surface of the portion that is attached to the pressing member 7. As shown in FIG. On the other hand,
The outer peripheral surface of the boss portion 7A of the pressing member 7 is provided with an engaging convex portion 7a having a length of 3111il with a slightly shorter length in the circumferential direction so as to allow reciprocating rotation in the rotational direction within the engaging four portions 8a of the mold wheel 8. is formed (see Figure 4 (al), Figure 5), as well as the model car 8.
An annular notch 7b having a constant depth is provided on the outer circumferential portion of the side surface in contact with. A spring 11 that presses the driving member 6 outward with respect to the driven member 5 is installed in the through hole of the pressing member 7 fitted into the driven member 5 . The drive shaft 4 is provided with a small-diameter threaded portion 4b at the right end thereof, and the washer 12 held by the nut 13 screwed into the small-diameter threaded portion 4b is rotated in the direction of loosening the washer 12. prevent it from falling off.

14 is a shaft fixed to the upper part of the side plate 1.2, and this shaft 14
A ratchet pawl 16 is attached to a portion protruding from the side plate 2, which is pressed against the mold wheel 8 by a spring 15, and prevents the mold wheel 8 from reversing when loading and unloading the load. In addition, a connecting fitting 17 is attached to the shaft 14 between the side plates 1.2.
An upper hook 18 is provided through. A load chain 19 is wound around the load sheave 3, and a lower hook 21 for hanging cargo is connected to the lower end of the load chain 19 via a connecting fitting 20.

The drive member 6 connects the switching gear 6a to the operating lever 22.
It is stored inside. This operating lever 22 has an inner lever case 23 and an outer lever case 24 that are formed separately.
It is composed of. The inner lever case 23 has a circumferential surface 23 a that slides on the outer peripheral surface of the pressing member 7 and a pressing member 7 .
The inner lever case 23 has an annular notch 7b and a locking surface 23b having a circular opening 23c.
It is bent at right angles in the direction opposite to the protruding side. In contrast to this inner lever case 23, the outer lever case 2
4 is integrally coupled with a plurality of screws 25 and nuts 26, and a circular opening 24a is provided in a portion of the drive member 6 corresponding to the operation grip 6b through which the operation grip 6b is inserted without contacting the operation grip 6b. is provided.

A rotation direction switching pawl 28 is housed in the operating lever 22 on the lower side of the drive member 6 and is rotatably held by a shaft 27 with respect to both lever cases 23 and 24. Reference numeral 29 denotes a suppressing member that urges the lower end of the rotational direction switching pawl 28 upward by a spring 30. The pawl 28 is connected to the switching gear 6a of the drive member 6.
Press the button at all times. Further, on the right side of the side plate 2, a brake cover 32 that covers the driven member 5, the friction member 9, the die wheel 8, and the ratchet pawl 16 that engages with the die wheel 8 is installed to keep the side plate 1.2 at a certain level. It is mounted so as not to come into contact with the inner lever case 23 using a plurality of screws 33 and nuts 34 kept at intervals.

Since this example is configured as described above,
When a load is applied to the lower hook 21 with the switching pawl 28 locked to the switching gear 6a, the load sheave 3 and the drive shaft 4 integrally attached thereto will move as seen from the left side in FIG. Rotated slightly clockwise. Drive shaft 4 screw 4a
Since the part has a right-handed thread, when the drive shaft 4 rotates slightly, the drive member 6, which is screwed onto the screw 4a but is prevented from rotating by the switching pawl 28, moves toward the side plate 2. Pressure is applied to the pressing member 7, die wheel 8, and friction member 9 via the friction member 10, and a braking force is also applied to the surface of the driven member 5, which is fixed in position at the stepped portion of the drive shaft 4. .

Moreover, at this time, since the mold wheel 8 is prevented from reversing by the ratchet pawl 16, neither the drive shaft 4 nor the load sheave 3 rotates after a slight rotation, and the load remains applied.

When the operating lever 22 is operated clockwise in this state, the rotation direction switching pawl 28 rotates the drive member 6 in the load lifting direction, so that the friction member 10, the suppression member 7, and the model wheel are rotated together by the drive member 6. 8, the friction member 9 and the driven member 5 rotate the load sheave 3 in the load lifting direction and lift the load suspended from the lower fusol 21 by the amount of operation of the operating lever 22. On the other hand, when the rotational direction switching pawl 28 is engaged with the switching gear 6a in the opposite manner, the driving member 6 moves to the right by operating the operating lever 22 and no longer presses the friction member IO. The friction member 10, the pressing member 7, the friction member 9, and the driven member 5 are rotated together with the drive shaft 4 in the direction of unloading the load by the load suspended from the lower hook 21, and are prevented from rotating by the switching claw 28. Drive unit 'fJ
6 is pressed by the friction member 10 to move the load downward until the rotation of the drive shaft 4 is stopped.

In addition, when changing the position of the load chain 19 freely in an unloaded state with no cargo hanging from the lower hook 21, first use the handle 31 to adjust the rotation direction switching claw 28.
is moved to the neutral position shown in FIG. 1 and disengaged from the switching gear 6a. Next, the operation grip part 6b of the drive member 6
When the drive member 6 is gripped and rotated counterclockwise, the drive member 6 is moved away from the friction member 10 with the help of the biasing force of the spring 11. When the movement of the drive member 6 is stopped by the washer 12 and you release your hand from the operation grip 6b, the drive member 6 moves away from the friction member 10 and is released from the braking force.
Since the lower hook 21 idles together with the load sheave 3 via the drive shaft 4, the position of the lower hook 21 connected to the load sheave 19 can be quickly and easily moved to the idle position.

Moreover, in the case of this embodiment, the mold wheel 8, which is locked by the ratchet pawl 16 and is rotatable in only one direction, is connected to the outer circumferential surface of the boss portion 7A of the pressing member 7 by the engagement uneven portions 7a and 8a. Since almost no relative movement occurs, the inner circumferential surface of the hole of the mold wheel 8 is hardly subjected to wear by the pressing member 7. Therefore, heat treatment of the mold wheel 8, which was conventionally required to prevent wear, can be omitted.

Furthermore, since no quenching distortion occurs in the die wheel 8 by omitting the heat treatment, when the die wheel 8 is brought into uniform contact with the friction member 9, it is not necessary to polish the side surfaces of the die wheel 8 in parallel to remove the quenching distortion. becomes unnecessary.

Furthermore, the mold wheel 8 in which the claw portion and the engagement recess 8a are formed can be punched out at once by simultaneous press working, resulting in good productivity, and therefore manufacturing costs can be reduced.

Effects of the Invention This invention provides a lever two-pupil upper machine in which a mold wheel, which is locked to a ratchet pawl so as to be able to rotate only in one direction, is attached to a pressing member fitted to the outer periphery of a boss portion of a driven member. In addition, since the fitting part of the driven member and the pressing member are connected by the engagement uneven part, the inner peripheral surface of the hole of the mold wheel is prevented from being worn out, and the heat treatment that was applied to the mold wheel can be avoided. Can be omitted. In addition, since the mold wheel is not subjected to quenching distortion due to heat treatment, it is not necessary to polish the side surface of the mold wheel to remove the quenching distortion when effectively exerting the braking action between the friction member and the pressing member. process can be eliminated.

In addition, this mold wheel can be efficiently manufactured by punching by simultaneous press working, and this, together with the omission of the manufacturing process, provides an excellent effect in that the manufacturing cost of the device can be reduced.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, Fig. 2 is a right front view of the same, Fig. 3 is a plan view of the mold wheel, and Fig. 4 is a drawing of the pressing member, (al is a plan view, ( bl is a longitudinal sectional view, FIG. 5 is a longitudinal sectional view showing the engagement relationship of the drive shaft, pressing member, model wheel, and ratchet pawl, and FIG. 6 is a drawing of the inner lever case.
(al is a longitudinal sectional view, (bl is the same right front view. 3... Load sheave, 4... Drive shaft, 5... Driven member, 5a... Boss portion of driven member, 7 ...Press member, 7A...Boss portion of press member, 1as8a...
Engagement uneven portion, 8... type wheel, 9.10... friction member,
21...Lower hook, 22...Operation lever Fig. 3 Fig. 5 Fig. 4 (a) (b) Fig. 6 (CI) (b) 23° [Co., Ltd.] 2626 Gallery... □ ◎ 23

Claims (1)

[Claims] 1. In a lever-type hoisting machine in which a drive shaft is rotated by operating a control lever and a lower hook for hanging cargo is moved vertically via a load sheave attached to the drive shaft, the boss of the driven member is A pressing member is fitted to the outer periphery of the pressing member, and friction members are provided on both sides of the boss portion of the pressing member to be fitted onto the boss,
A ratchet wheel is installed between the friction member on the side of the driven member and the side surface of the pressing member, and a ratchet wheel is installed between the inner peripheral surface of the hole of the ratchet wheel and the outer peripheral surface of the boss portion of the pressing member so that both of them move slightly in the rotational direction. 1. A lever type winding machine characterized by having an engaging concavo-convex portion for connection in the radial direction that allows for