JPH0442316Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a lever-type hoisting machine that performs hoisting or hoisting by repeatedly rotating an operating lever. This invention relates to a lever type winding machine that can smoothly pull down a lower hook.

(Prior Art) As shown in FIG. 3, the general support structure for the operating lever in a conventional lever-type winding machine is that the cover part b of the operating lever a has a cylindrical part c, and the cylindrical part c is rotatably supported by a cylindrical portion f of a brake cover e attached to a side plate d of the hoisting machine body. The cylindrical portions c and f are connected to the drive shaft g.
It is formed to extend parallel to the axis of. h is a driven wheel, i is a friction plate, j is a brake release spring, k is a driving wheel, and l is a manually operated wheel.

(Problem to be solved by the invention) However, in the conventional structure, coupled with the small supporting area, it is not possible to obtain a stable support state for the operating lever a, and the operating lever a cannot be rotated in its original rotation direction. It is easy to swing not only in the direction of rotation of the drive shaft g, but also in the axial direction of the drive shaft g.

Therefore, when operating the hoisting machine, the cylindrical portion c of the operating lever a may come into contact with the drive wheel k, or the cylindrical portion m on the opposite side of the cylindrical portion c may come into contact with the driving wheel k.
However, a situation arises in which the wheel comes into contact with the drive wheel k or the manually operated wheel l, making it impossible to smoothly operate the hoist. In particular, during idle rotation, that is, in an unloaded state where no load is suspended, when the lower hook of the load chain is pulled down by the manually operated wheel l to return the load chain to a predetermined length, the load on the drive shaft g is The rotational force of the attached drive parts such as the driven wheel h, drive wheel k, and manually operated wheel l becomes heavy, resulting in a situation where the rotation cannot be performed smoothly.

In this regard, the cylindrical portion c of the operating lever a
and the cylindrical portion f of the brake cover e is bent as shown in FIG. A structure having the following structure has been proposed (see, for example, Japanese Utility Model Publication No. 18625/1983).

However, if the cylindrical parts c and f are bent as shown in Fig. 4, high-precision machining is required for the fitting parts in order to ensure the precision in assembling the operating lever a to the brake cover e. requested,
Problems arose in that the number of steps increased, and assembly required time and effort, resulting in poor workability and relatively high production costs.

The present invention has been developed in view of the above-mentioned problems in the prior art, and it is possible to obtain a stable support state of the operating lever, and to ensure smooth rotation of each driving section.
It is an object of the present invention to provide a lever-type hoisting machine which can smoothly pull down a lower hook especially in a no-load state and has good workability in manufacturing.

(Means for Solving the Problems) In order to achieve the above object, the lever-type hoisting machine of the present invention has the following features:
an outer cylindrical portion is formed to extend parallel to the axis of the drive shaft; a manual operation wheel rotatably mounted on the drive shaft has a cylindrical outer peripheral surface extending parallel to the axis of the drive shaft; A bearing is interposed between the outer cylindrical part of the operating lever and the cylindrical outer circumferential surface of the manual operating wheel, and the outer cylindrical part is fitted to the cylindrical outer circumferential surface of the bearing, and the outer cylindrical part of the manual operating wheel is It is characterized in that the cylindrical inner circumferential surface of the bearing is fitted onto the cylindrical outer circumferential surface.

The axial direction herein means a direction parallel to the axis of the drive shaft.

The cover portion of the operating lever includes, for example, an upper cover portion of the lever main body and a lever cover, and an outer cylindrical portion supported by the cylindrical outer peripheral surface of the manual operation wheel is formed in the upper cover portion; The lever cover is formed with an inner cylindrical portion that is supported by the brake cover cylindrical portion.

Further, the support structure for the cylindrical outer peripheral surface portion of the manual operation wheel is such that, for example, the outer ring of the bearing is press-fitted into the inner diameter surface of the outer cylindrical portion of the operation lever, and the cylindrical outer peripheral surface of the manual operation wheel is , is a raceway surface on which the rolling elements of the bearing roll.

(Function) A bearing is interposed between the outer cylindrical part of the operating lever and the cylindrical outer peripheral surface of the manual operating wheel, so that the operating lever rotates smoothly with respect to the brake cover and the manual operating wheel. At the same time, the outer cylindrical part is fitted to the cylindrical outer peripheral surface of the bearing,
Since the cylindrical inner circumferential surface of the bearing is fitted onto the cylindrical outer circumferential surface of the manual operation wheel, swinging of the operating lever in the axial direction is suppressed.

an outer cylindrical portion extending parallel to the axis of the drive shaft is formed at the axially outer end portion of the cover portion of the operation lever made of a metal plate, and a manual operation wheel rotatably mounted on the drive shaft; A cylindrical outer peripheral surface is formed extending parallel to the axis of the drive shaft, a bearing is interposed between the outer cylindrical part of the operating lever and the cylindrical outer peripheral surface of the manual operation wheel, and the outer cylindrical part is supported by the bearing. It can be constructed by fitting the outer circumferential surface of the bearing and the inner circumferential surface of the bearing onto the cylindrical outer circumferential surface of the manual operation wheel, so assembly is easy and does not require special processing such as hardening or drawing. Also, the workability of assembly is good.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

A lever-type winding machine according to the present invention is shown in FIGS. 1 and 2. The hoisting machine includes a hoisting machine main body 1, a load sheave 2, a reduction gear mechanism 3, a drive shaft 4, a drive transmission mechanism 5, an operating lever 6, and the like as main parts.

The load sheave 2 is rotatably supported via bearings 7, 7 between a pair of side plates 1a, 1b constituting the hoisting machine main body 1, and a load chain 8 is wound around the load sheave 2. . The load sheave 2 also includes the reduction gear mechanism 3 which is housed in the gear box 9 and is comprised of a plurality of large and small gears.
The pinion gear 10 of the drive shaft 4 is connected to the pinion gear 10 of the drive shaft 4 via. Reference numeral 11 indicates an upper hook for suspending the hoist main body 1, and reference numeral 12 indicates a lower hook for suspending a load provided at the lower end of the load chain.

The drive shaft 4 is rotatably supported in a shaft hole 2a provided on the axis of the load sheave 2, and the pinion gear 10 is fixed to one end (the left end in the drawing) of the drive shaft 4. There is. Further, the drive transmission mechanism 5 is attached to the other end of the drive shaft 4 (the right end in the drawing), and the drive shaft 4 is connected to the operation lever 6 via the drive transmission mechanism 5. ing.

The drive transmission mechanism 5 includes a driven wheel 13 and a driving wheel 14.
, friction plates 15, 15 and ratchet mechanism 16
It consists of a brake section consisting of.

The driven wheel 13 is screwed and fixed to a first threaded portion 4a provided on the drive shaft 4, and is formed from a large diameter pressure receiving disk portion 13a and a small diameter boss portion 13b. A ratchet wheel 16a of the ratchet mechanism 16 is attached to the boss portion 13b.
and friction plates 15, 15 arranged on both sides of the ratchet wheel 16a in the axial direction are rotatably fitted. In addition, the ratchet wheel 16a
A ratchet pawl 16b pivotally supported on the side plate 1b is releasably engaged with the locking teeth, so that the ratchet wheel 16a can rotate only in the direction in which the load sheave 3 is hoisted up. A spring 17 biases the ratchet pawl 16b toward the ratchet wheel 16a.

The drive shaft 14 transmits the driving force of the operating lever 6.
The ratchet wheel 16a and the friction plate 1
5 and 15 to transmit the pressure to the pressure receiving disk portion 13a of the driven wheel 13, and is screwed into the first threaded portion 4a of the drive shaft 4 so as to be able to move forward and backward in the axial direction thereof. On the outer periphery of the drive wheel 14,
A transmission gear 14a is formed. Further, a brake release spring 18 made of a coil spring is interposed between the driving wheel 14 and the driven wheel 13, so that the driving wheel 14 is always moved outward in the axial direction (toward the right in the drawing). Being pressed.

Further, a manually operated wheel 19 is provided adjacent to the drive wheel 14 on the outside in the axial direction (on the right side in the drawing, the same applies hereinafter). The manual operation wheel 19 is used to rapidly rotate the drive wheel 14 when the winding machine is idle, and is rotatably supported by the cylindrical portion 4b of the drive shaft 4. An engaging protrusion 19 is provided at the axially inner end (left end in the drawing) of the manual operation wheel 19.
a is provided, which is the engagement groove 1 of the drive wheel 14.
It has been rushed into 4b.

The axially inner outer circumferential surface 19b of the manual operation wheel 19 (the left side in the drawing, the same applies hereinafter) is a cylindrical outer circumferential surface extending parallel to the axis of the drive shaft 4, and the radial outer circumferential surface 19b adjacent to the cylindrical outer circumferential surface 1b is Annular surface 19c
is an annular plane perpendicular to the axis of the drive shaft 4. The annular plane 19c acts as a position regulating surface of the operating lever 6 in the axial direction.

An adjustment member 20 is provided on the axially outer side of the manual operation wheel 19. The adjustment member 20 is for adjusting the engagement rotation angle between the engagement protrusion 19a and the engagement groove 14b, and for transmitting the rotation of the drive shaft 4 to the manual operation wheel 19.
The spline portion 4c is spline-fitted to the spline portion 4c. Furthermore, an engaging protrusion 20a is formed on the outer circumferential portion of the adjusting member 20, and is capable of being engaged with an engaging portion 19d of the manual operation wheel 19. Reference numeral 21 denotes a tightening nut for preventing the manual operation wheel 19 and the adjustment member 20 from falling off, and is attached to the second threaded portion 4 of the drive shaft 4.
It is screwed onto d.

By the way, when the lower hook is pulled to lower the load chain, the drive shaft 4 rotates in the winding direction (counterclockwise when viewed from the right in FIG. 1). At this time, driving wheel 1
4 should remain stationary without rotating together, the drive wheel 14 would move to the left in FIG. 1 and forcefully press the friction plate 15, causing the drive shaft 4 to stop rotating.

At this time, the brake release spring 18
It is there to keep it pressed to the right,
If the rotation of the drive wheel 14 is fast or the drive wheel 14
When the brake release spring 18 comes into contact with the inner surface of a peripheral member, the drive wheel 1 overcomes the spring force of the brake release spring 18 and
4 will move to the left and apply the brakes.

The engagement protrusion 19a of the manual operation wheel 19 and the engagement protrusion 20a of the adjustment member 20, etc., allow the drive wheel 14 to spiral to the left as described above and press the friction plate when the lower hook 12 is pulled. This was established to prevent this from happening.

That is, when the drive shaft 4 is rotated in the winding direction (counterclockwise when viewed from the right in FIG.
As a result, the manually operated wheel 19 is rotated vigorously in the winding direction. Manual operation wheel 19
Since it is free to rotate with respect to the drive shaft 4, it rotates due to the moment of inertia. Then, the engagement protrusion 19a on the inside of the manual operation wheel 19 collides with the groove end of the groove 14b of the drive wheel 14, rotating the drive shaft 14 in the winding direction.

By repeating the above steps, when the drive wheel 14 tries to spiral leftward, it is forcibly rotated in the winding direction, so the friction plate is not pressed, and the drive shaft can rotate smoothly. For this reason, the lower hook can be pulled down quickly.

Further, a brake cover 22 is attached to the side plate 1b of the hoist main body 1, and the brake parts 15, 16, 15 of the drive transmission mechanism 5 are covered by the brake cover 22. The brake cover 22 is made of a copper plate, and a mounting flange 22a at one end thereof is fixedly attached to the side plate 1b. Further, a cylindrical brake cover cylindrical portion 22b is formed on the other end side of the brake cover 22, and the brake cover cylindrical portion 22b is coaxial with the axis of the drive shaft 4 and axially outward. It is formed to extend in the direction.

The operating lever 6 is for rotationally driving the drive wheel 14 in the winding-up direction or the winding-down direction,
The upper part covers the outer periphery of the drive wheel 14, and
As will be described later, it is rotatably supported by the brake cover 22 and the manual operation wheel 19.

The operating lever 6 consists of a lever body 23 and a lever cover 24 made of a steel plate. The lever cover 2
4 is an upper cover portion 23a of the lever main body 23;
The drive wheels 14 are integrally connected by a plurality of bolts and nuts 32, and cover the entire outer periphery of the drive wheels 14.

An inner cylindrical portion 24a is provided on the axially inner side (left side in the figure) of the lever cover 24, and the inner cylindrical portion 24a is coaxial with the axis of the drive shaft 4 and extends axially inwardly. It is formed to extend. The outer diameter surface of this inner cylindrical portion 24a has an outer diameter dimension such that it slides into or is close to the inner diameter surface of the brake cover cylindrical portion 22b. Further, an outer cylindrical portion 25 is provided on the axially outer side of the upper cover portion 23a of the lever main body 23, and the outer cylindrical portion 25 includes:
It is formed coaxially with the drive shaft 4 and extending outward in the axial direction. The inner cylindrical portion 24a of the lever cover 24 is rotatably supported by the brake cover cylindrical portion 22b, and
The outer cylindrical portion 25 of the upper cover portion 23a is rotatably supported by the cylindrical outer peripheral surface 19b of the manual operating wheel 19 via a bearing 26, so that the operating lever 6 can be rotated in both directions. It is designed to be held and supported.

The bearing 26 is configured such that a plurality of rollers 26b are rollably mounted on the inner diameter surface of an outer ring 26a, the outer ring 26a is press-fitted and fixed to the outer cylindrical portion 25 of the operating lever 6, and the rollers 26b roll on the cylindrical outer peripheral surface 19b, which is a raceway surface.
This ensures smooth relative rotation between the outer cylindrical portion 25 of the operating lever 6 and prevents the lever 6 from swinging in the axial direction.

A rotating direction switching pawl 27 is housed inside the operating lever 6 . The rotation direction switching pawl 27 is fixed to a support shaft 28 that is rotatably pivotally connected to the operating lever 6. The support shaft 28 projects outward from the operating lever 6, and a switching handle 29 is attached and fixed to this projecting portion. By operating this handle 29, the rotational direction switching pawl 27 is switched to the drive wheel 1.
It is selectively switched between two engagement positions (a winding-up position and a winding-down position) in which it engages with the transmission gear 14a of No. 4 and a neutral position in which it does not engage with the transmission gear 14a. That is, in the engagement position, the swinging motion of the operating lever 6 is transmitted to the drive wheel 14, and the drive wheel 14 rotates in the winding-up direction (winding-up position) or the winding-down direction (winding-down position). While being driven;
In the neutral position, the drive wheels 14 are not rotationally driven in either direction.

A positioning member 30 is elastically engaged with the lower end of the rotational direction switching claw 27 by an engagement spring 31, so that the rotational direction switching claw 27 can be moved to the engagement position or held in a neutral position.

Therefore, in the lever-type hoisting machine configured as described above, when the operating lever 6 is rotated back and forth with the rotation direction switching claw 27 switched to the hoisting position, the load sheave 2 is hoisted. The lower hook 12 is rolled up by rotating intermittently in the direction. On the other hand, on the contrary, rotation direction switching claw 2
7 to the lowered position, press the operating lever 6.
When the load sheave 2 is rotated in a reciprocating manner, the load sheave 2 is intermittently rotated in the winding direction, and the lower hook 12 is turned down. In addition, if you want to quickly pull down the lower hook 12 in an unloaded state with no cargo hanging from the lower hook 12, move the lower hook 12 downward while switching the rotation direction switching pawl 27 to the neutral position. Just pull it.

In this case, both cylindrical portions 24 of the operating lever 6
a, 25 are rotatably supported by the cylindrical portion 22b of the brake cover 22 and the cylindrical outer circumferential surface 19b of the manual operation wheel 19, respectively, and are rotatably supported by the outer cylindrical portion 25 of the operation lever 6 and the cylindrical outer surface of the manual operation wheel 19. Radial surface 1
A bearing 26 is interposed between the outer cylindrical portion 2 and the outer cylindrical portion 2.
5 is fitted to the cylindrical outer circumferential surface of the bearing 26, and the cylindrical inner circumferential surface of the bearing 26 is fitted to the cylindrical outer circumferential surface 19b of the manual operating wheel 19, so that the operating lever 6
The perpendicular state of the drive shaft 4 to the axis is always maintained, and vibration in the axial direction is prevented. Therefore, when operating the hoisting machine, the inner surfaces of the lever body 23 and the lever cover 24 can be prevented from coming into contact with the drive wheel 14 and the manual operation wheel 19, and the hoisting machine can be operated smoothly. In particular, the lower hook pull-down operation (idling operation) under no-load conditions is performed extremely smoothly.

Further, the cylindrical outer peripheral surface 19b of the manual operation wheel 19
Since a bearing 26 is interposed between the outer cylindrical portion 25 of the operating lever 6 and the outer cylindrical portion 25 of the operating lever 6 supported thereby, smooth relative rotation between the two is ensured.

Note that the cylindrical inner diameter surface of the bearing 26 is
It includes a cylindrical surface inscribed in 6b, and the bearing may be one in which an inner ring is provided on the inner periphery of a roll/ball.

(Effects of the Invention) As detailed above, according to the present invention, the excellent effects listed below can be obtained, and a lever type winding machine that is extremely useful in practice can be provided.

That is, a bearing is interposed between the cylindrical outer peripheral surface of the manual operation wheel and the outer cylindrical part of the operating lever supported by the bearing, and the outer cylindrical part is fitted to the outer peripheral surface of the bearing. Since the cylindrical inner peripheral surface of the bearing is fitted onto the cylindrical outer peripheral surface of the operating wheel, swinging of the operating lever in the axial direction of the drive shaft is prevented, and a stable support state of the operating lever is obtained.

Therefore, when operating the hoisting machine, there is no possibility that the inner surface of the operating lever comes into contact with the driving wheel or the manual operating wheel due to the swinging of the operating lever. Smooth rotation of each of these driving parts can be ensured at all times, and the hoist can always be operated smoothly and stably in any operating posture and under any conditions. This effect is particularly noticeable in the lower hook pull-down operation (idling operation) under no-load conditions.

Furthermore, smooth relative rotation between the two is ensured, and the rocking operation of the operating lever and the rotating operation of the manual operating wheel can also be performed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a lever-type hoisting machine which is an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view showing the main parts of the same lever-type hoisting machine, and FIGS.
Each figure corresponds to FIG. 2, which shows a conventional lever-type winding machine. 1...Hoisting machine main body, 1a, 1b...side plate, 4...
... Drive shaft, 6 ... Operation lever, 14 ... Drive wheel,
19... Manual operation wheel, 19b... Cylindrical outer peripheral surface, 2
2... Brake cover, 22b... Brake cover cylindrical part, 23... Lever main body, 23a... Upper cover part, 24... Lever cover, 24a... Inner cylindrical part of lever cover, 25... Upper cover outer cylindrical portion of the section, 26...bearing, 26a...outer ring,
26b...Roller (rolling element).

Claims (1)

[Claims for Utility Model Registration] (1) An outer cylindrical portion is formed at the outer end in the axial direction of the cover portion of the operating lever and extends parallel to the axis of the drive shaft, and is rotatably mounted on the drive shaft. The manually operated wheel has a cylindrical outer peripheral surface extending parallel to the axis of the drive shaft, and a bearing is interposed between the outer cylindrical portion of the operating lever and the cylindrical outer peripheral surface of the manually operated wheel. , a lever-type winding device characterized in that the outer cylindrical portion is fitted onto the cylindrical outer circumferential surface of the bearing, and the cylindrical inner circumferential surface of the bearing is fitted onto the cylindrical outer circumferential surface of the manual operation wheel. Machine. (2) An inner cylindrical portion and an outer cylindrical portion are formed on both axial sides of the cover portion of the operating lever made of a metal plate and extend parallel to the axis of the drive shaft, and are attached to the side plate of the winding machine body. A brake cover cylindrical part is formed in a brake cover made of a metal plate and extends parallel to the axis of the drive shaft. The inner cylindrical part of the operating lever is rotatably supported by the brake cover cylindrical part, and the outer cylindrical part of the operating lever and the manual operating wheel are formed to extend parallel to the axis of the shaft. A bearing is interposed between the cylindrical outer circumferential surface of the manual operation wheel, and the outer cylindrical part is fitted to the outer circumferential surface of the bearing, and the inner circumferential surface of the bearing is fitted onto the cylindrical outer circumferential surface of the manual operation wheel. A lever type winding machine that is characterized by: (3) The cover portion of the operating lever is composed of an upper cover portion of the lever body and a lever cover, and the upper cover portion is formed with a cylindrical portion that is supported by the cylindrical outer peripheral surface of the manual operating wheel; 3. The lever type hoisting machine according to claim 2, wherein the lever cover has an inner cylindrical portion supported by the brake cover cylindrical portion. (4) The outer ring of the bearing is press-fitted into the inner diameter surface of the outer cylindrical portion of the operating lever, and the cylindrical outer peripheral surface of the manual operating wheel is used as a raceway surface on which rolling elements of the bearing roll. Claims 1 and 2
or the lever-type hoisting machine described in item 3.