JPH0111676Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a manual hoisting device, specifically a manual hoisting device equipped with a friction connection mechanism that prevents hoisting or towing when a load exceeding the rated load is applied. Regarding the type hoisting device.

(Prior art) Conventionally, this type of hoisting device was developed by the Japanese Patent Publication No. 49-41781
As shown in the above publication and as shown in FIG. 3, a brake holder b and a brake holder c are screwed onto the drive shaft a, and a manually rotating member d is attached to the outer periphery of the brake holder c.
is rotatably supported via a one-way rotation drive mechanism, and between the brake presser c and the manual rotation member d, a pair of friction plates e, f, a tightening plate g, an elastic member h, and a friction member are provided. It is known that a frictional connection mechanism consisting of an adjusting member i is provided so that when an overload is applied to the load sheave j, the frictional connection slips and cannot be hoisted or pulled.

(Problems to be Solved by the Invention) By the way, in such a conventional device, the friction plates e and f are located between the brake presser c and the manually rotating member d, and between the manually rotating member d and the disc-shaped tightening member. The friction plates e and f are interposed in an exposed manner between the friction plates e and f.
Since the outer circumferential surface of the friction joint is exposed to the outside, mud, dirt, etc. easily enter the friction joint, and the friction coefficient of the friction joint decreases due to the mud, dirt, etc., and the rated load decreases. Even if the load below is applied, the friction connection may slip and the hoisting operation cannot be performed, or the coefficient of friction may become high and the drive system will not slip when hoisting a load exceeding the rated load. There was a problem with the camera being damaged.

In FIG. 3, although a lever k is provided on the outside of the manual rotating member d, there are gaps between the lever k and the brake presser c and between the lever k and the tightening plate g. Therefore, mud, dirt, etc. can enter the friction joint through these gaps.

An object of the present invention is to prevent mud and dirt from entering the frictional connection, thereby preventing changes in the coefficient of friction of the frictional connection, thereby solving the above-mentioned problems.

(Means for Solving the Problems) The present invention provides annular first and second recesses 81 and 82 on both sides in the axial direction at the center of the manual rotation member 8.
The friction plate 10 is provided in the first recessed part 81.
Further, the friction plate 11, the elastic member 13, and the friction adjustment member 14 are installed inside the second recessed part 82, and the recessed parts 81 and 82 are connected to the shaft end of the brake presser 7 and the drive shaft 4. It is designed to be closed by a retaining member 15 fixed to.

(Function) Therefore, the first
The friction plate 10 is placed in the recessed part 81, and the friction plate 11, the elastic member 13, and the friction adjustment member 14 are placed in the second recessed part 82.
and by closing the first recessed part 81 with the brake holder 7 and the second recessed part 82 with the retaining member 15, it is possible to prevent mud, dirt, etc. from entering the frictional connection part. This makes it possible to prevent the friction coefficient set at the friction connection from changing.

(Example) Examples of the present invention will be described below based on the drawings.

In the figure, reference numerals 1 and 1a denote a pair of side plates facing each other with a predetermined interval between them. A cylinder shaft 3 having a load sheave 2 is rotatably supported between these side plates 1 and 1a, and the center of the cylinder shaft 3 is The drive shaft 4 is rotatably supported in the hole, and a reduction gear mechanism 5 is interposed between the protruding end of the drive shaft 4 on the side plate 1 side and the load sheave 2. The rotational power is transmitted to the load sheave 2 at a reduced speed. Further, a threaded portion 41 is formed on the protruding end of the drive shaft 4 on the other side plate 1a side, and a brake receiver 60 and a brake presser 7 are screwed into the threaded portion 41. Two friction plates 61 and 62 and a ratchet gear 63 are provided in the formed annular notch, and a lock pawl 64 that engages with and fixes the gear 63 is provided on the cover 65 attached to the side plate 1. While constituting the mechanical brake 6, a manual rotation member 8 is rotatably supported on the outer periphery of the small diameter portion 72 of the brake presser 7 via a one-way rotation drive mechanism, and the brake presser 7 and the manual rotation member 8 are connected to each other. In between, a pair of friction plates 10, 11, an elastic member 13, and a friction adjustment member 14 are arranged.
A frictional connection mechanism is provided, and when a load exceeding the rated load is applied to the load sheave 2, the frictional connection portion slips and hoisting cannot be performed.

Therefore, in the manual hoisting device constructed as described above, the present invention provides first and second annular recesses 81 and 82 on both sides in the axial direction in the center of the manual rotating member 8, and The friction plate 10 is installed in the recessed part 81, and the friction plate 11, elastic member 13, and friction adjustment member 14 are installed in the second recessed part 82. And it is closed by a retaining member 15 fixed to the shaft end of the drive shaft 4.

In the embodiment shown in the figure, the brake presser 7 is made up of a large diameter part 71 having a pressing side surface and a small diameter part 73 that is continuous through a step part 72, as shown in FIG.
A threaded groove 73 into which the friction adjustment member 14 made of a nut is screwed, and a concave groove 74 for preventing rotation of a presser plate, which will be described later, are formed on the outer periphery of the tip of the small diameter portion 72.

The manual rotation member 8 is composed of a feed gear having a toothed portion 80 around the outer periphery and annular first and second recessed portions 81 and 82 on both sides in the axial direction in the center. The outer end surface of the first recessed portion 81 is provided in a substantially abutting manner with the side surface of the large diameter portion 71 to close the first recessed portion 81, while the second recessed portion 81 is closed.
A cylindrical extension part 83 is formed by extending the upper surface of the recessed part 82 outward to accommodate the friction plates 10, 11, the elastic member 13, the friction adjustment member 14, etc., and the extension part 83 and the outer periphery of the large diameter portion 71 of the brake presser 7, the lever 16 is rotatably supported, and the transmission pawl 1 provided on the lever 16
By switching the forward/reverse switching lever 18 having the number 7, the transmission pawl 17 is brought into engagement with the teeth 80 of the feed gear 8 in the forward or reverse rotation state.

As shown in FIG. 2, the one-way rotation drive mechanism includes a recess 84 formed in the inner circumferential surface of the feed gear 8, and an engaging body 91 is always attached to the center side within the recess 84 via a spring 92. On the other hand, an engagement groove 75 is formed on the outer periphery of the small diameter portion 72 of the brake presser 7, into which the engagement body 91 can be inserted, and extends in a wedge shape in the circumferential direction. When rotated in the lowering direction shown by the arrow in the figure, the feed gear 8 and the brake presser foot 7 are integrally connected, and a brake presser starting torque larger than the transmission torque of the frictional connection part is required at the time of lowering. Even in such cases, it is possible to lower the cover by slightly increasing the manual operating force.

Reference numeral 12 denotes an annular presser plate interposed between the friction plate 11 and the elastic member 13, and the presser plate 12 has a protrusion 12a that protrudes inward on the inner peripheral surface thereof. It is fitted into the groove 74 and is mounted so as not to rotate in the circumferential direction.

The retaining member 15 includes a side wall 15a that closes the open end of the extending portion 83, and a handle portion 15b extending outward from the outer periphery of the side wall 15a. Threaded part 4
1. The second recessed portion 82 is closed by supporting the side wall 15a non-rotatably outwardly by serrations or spline fitting, and positioning the outer surface of the side wall 15a in substantially contact with the opening end surface of the extending portion 83. Arrange them as you like.

The present invention is constructed as described above, and includes a friction plate 10 inside the first recessed portion 81 of the feed gear 8,
The recessed portion 81 is closed by the outer surface of the brake presser 7 and the outer surface of the feed gear 8 on the brake presser 7 side, and the second recessed portion 82 is provided with a friction plate 11, a presser plate 12, an elastic member 13, and a friction adjustment member. 14 inside and the second recessed portion 82 closes the outer end surface of the extending portion of the feed gear 8 and the side wall 15a of the retaining member 15, so mud, dirt, etc. can prevent the frictional connection from occurring as in the conventional example. The friction coefficient of the friction connection part decreases due to the mud and dirt, and slips occur in the friction connection part when unloading a load below the rated load, or the friction coefficient increases and the rated load decreases. This prevents slips from occurring when hoisting up the cargo, and damage to the drive system can be prevented.
Furthermore, since mud, dirt, etc. do not enter the friction adjustment member 14, the adjustment movement of the transmission torque by the adjustment member 14 can be performed smoothly and accurately.

In addition, in the above-described embodiments, the lever-type hoisting device was explained, but in addition to this,
It may also be implemented in a manual winding device using a handwheel.

In this case, the above-described feed gear 8 and lever 16
Instead, a handwheel is rotatably supported on the outer periphery of the small diameter portion 72 of the brake presser 7, and first and second recessed portions 81 and 82 are formed on both sides in the axial direction at the center of the handwheel. gear 8
As in the case of , these first and second recessed portions 81,
82 is preferably configured to be closed.

(Effect of the invention) As described above, the present invention provides annular first and second recesses 81 and 82 on both sides in the axial direction in the center of the manual rotating member 8, and the first recess 81 is provided with the friction plate. 10, and the friction plate 11, the elastic member 13, and the friction adjustment member 14 are installed inside the second recessed part 82, and each of the recessed members 81 and 82 is
Since it is closed by a retaining member 15 fixed to the brake presser 7 and the shaft end of the drive shaft 4, it is possible to prevent mud, dirt, etc. from entering the friction connection part, and to prevent mud and dirt from entering the friction connection part. It is possible to prevent the coefficient of friction from changing, which prevents the friction connection from slipping when hoisting a load below the rated load, or causing damage to the drive system when hoisting a load above the rated load. It is possible to prevent this from happening.

Furthermore, since mud, dirt, etc. do not enter the friction adjustment member 14, the adjustment movement of the transmission torque by the adjustment member 14 can be performed smoothly and accurately.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a manual hoisting device showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a one-way rotation drive mechanism, and FIG. 3 is an explanatory diagram of a conventional hoisting device. 4... Drive shaft, 7... Brake presser, 8... Manual rotating member, 10, 11... Friction plate, 13... Elastic member, 14... Friction adjustment member, 15... Removal prevention member.

Claims (1)

[Scope of utility model registration request] A brake receiver 60 and a brake presser 7 are attached to the drive shaft 4.
are screwed together, and a manual rotating member 8 is rotatably supported on the outer periphery of the brake holder 7 via a one-way rotation drive mechanism, and a pair of This manual winding device is equipped with a friction connection mechanism consisting of friction plates 10, 11, an elastic member 13, and a friction adjustment member 14, and has annular first and Second recessed portions 81 and 82 are provided, and the first recessed portions 81 and 82 are provided.
The friction plate 10 is installed in the recessed part 81, and the friction plate 11, the elastic member 13, and the friction adjustment member 14 are installed in the second recessed part 82, and each of the recessed members 81 and 82 is installed inside the brake holder. 7 and a manual hoisting device, characterized in that it is closed by a retaining member 15 fixed to the shaft end of the drive shaft 4.