JPH04121397A - Electrically-operated hoist device - Google Patents

Abstract

PURPOSE:To easily perform torque adjustment frown the outside further with small torque by interposing a friction gear through friction plates by a pair of retaining plates, and pressing the retaining plates by a non-contact unit pressed by a tapered part of a thread-provided torque adjusting shaft. CONSTITUTION:A friction gear 4, meshed with a motor output shaft 5, is mounted rotatably about an axial center l of a driven shaft 26 and interposed by a pair of retaining plates 10, 11 through friction plates 6. A point end of a driver is inserted into a recessed groove 41 in a point end of a torque adjusting shaft 1, and when it is screw-advanced, a non-contact unit 3 is pressed by a tapered part 2 to convert a direction of pressing force into a direction at a right angle. A holding disc 22 is pressed by the non-contact unit 3 to press an inner wheel 25a of a ball bearing 25 through a thrust bearing 24 and a peripheral protrusive streak 37 of the retaining plate 10, and the friction plate 6 of the retaining plate 10 is pressed to the friction gear 4. Since the retaining plate 11 is resiliently pressed by a reaction force resilient member 9, the retaining plate 11 is pressed to the friction gear 4 by reaction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric hoisting device such as an electric chain hoist.

[Prior art and problems to be solved by the invention] Generally, in electric hoisting devices, limit switches for upper and lower limits are used to stop the chain. In type hoisting devices, this limit switch is often abolished and a torque limiter with adjustable torque is often used instead.

For example, in the conventional torque limiter described in Japanese Patent Publication No. 57-25475, each time the torque setting is changed or adjusted,
The cover had to be removed, which was a tedious task. Also,
This torque adjustment required a special tool and the application of a large torque, making the layer work troublesome.

Therefore, an object of the present invention is to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an electric hoisting device in which a rotorsorb is driven by a motor through a reduction gear mechanism, in which the motor output shaft and the acid motor output shaft are meshed to form a single axis. a friction gear that rotates around the periphery; a pair of presser plates that sandwich the friction gear via a friction plate; a threaded torque adjustment shaft formed with a threaded torque adjusting shaft; a contacted body that is pressed by the tapered portion and presses one of the holding plates toward the friction gear; and a contact member that presses the other holding plate toward the friction gear; and a reaction force resilient member that presses the shaft, and the outer end of the torque adjustment shaft is exposed to the outside.

[For production]

The outer end of the threaded torque adjustment shaft, which is disposed perpendicular to the uniaxial center, is exposed to the outside.
External force can be applied immediately with a tool such as a screwdriver (without removing the cover, etc.). When the torque adjustment shaft is advanced by such a boat fishing tool, its taper portion presses the object to be contacted, and the object to be contacted presses one of the holding plates, and the friction gear is moved through the friction plate. Press harder to the side. The other presser plate is elastically pressed by the reaction force elastic member, and is pushed in the opposite direction with the same force by the reaction force. In order to reduce the torque, conversely, the torque adjusting saw shaft may be screwed back.

〔Example] Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1, FIG. 2, and FIG. 3 show an embodiment of an electric hoisting device according to the present invention. The electric hoisting device includes a fuselage 12 incorporating a reduction gear mechanism, a motor 7 mounted laterally to the fuselage 12, a switch base 14 mounted laterally in the opposite direction, and a switch thereof. Cover 15 and fuselage 1
2, a load hook 43 at the lower end of the chain 42, and an operation push button switch 17 hanging from the switch base 14. 19
is a hook for hanging the electric hoisting device from a ceiling or the like. 18 is a chain storage bag for the rolled up load sheave 8. 13 is a power cable, and 16 is a wiring cable from the switch base 14 to the motor 7.0 The chain 42 is connected to the load sheave 8 (see Figure 3) in the fuselage 12.
is suspended.

FIG. 3 shows the reduction gear mechanism and torque adjustment device. The electric hoisting device of this embodiment includes a motor output shaft 5, a driven shaft 26 parallel to the motor output shaft 5, a friction gear 4 externally fitted rotatably on the motor output shaft 5, and a pair of annular gears in contact with both sides of the friction gear 4. One of the friction plates 6.6 is fixed and has serrations on its inner peripheral surface so as to be fitted onto the serrations of the driven shaft 26, and a circumferential protrusion 37 is formed on the outer surface of the inner peripheral edge. a substantially annular presser plate 10, a substantially annular presser plate 11 having serrations on its inner peripheral surface to which the other friction plate 6 is fixed and externally fitted onto the other serration portion of the driven shaft 26; A threaded torque adjustment shaft 1 is disposed perpendicularly to the axis 1 of the shaft 26 and has a substantially conical tapered portion 2 formed at its inner end, and the threaded portion 1a of the shaft 1 is screwed into the threaded torque adjusting shaft 1. a torque adjustment collar 20 having a screw hole 40 and a circumferential protrusion 39;
A contact object 3 made of a spherical ball and a recess 2 in the center.
3, a thrust bearing 24 in contact with the holding disc 22, a ball hair ring 25 adjacent to the holding disc 22, and a reaction force resilient member 9 such as a disc spring.

The torque adjustment shaft 1 has a circumferential groove 38 formed in the middle part, an O-ring 21 for sealing is fitted into the circumferential groove 38, and a single or cross-shaped groove 4 is fitted on the upper edge.
1 is formed and is always exposed to the outside of the fuselage 12.

The torque adjustment collar 20 is fixed to the body 12 with bolts 36 and 36, and the threaded portion 1a of the torque adjustment shaft 1 is inserted into the screw hole 40 so as to be able to be screwed forward and backward. In this way, the axis m of the torque adjustment shaft 1 is the axis of the driven shaft 2.
6, and its outer end is exposed outward from the fuselage 12.

Friction gear 4 meshing with the motor output shaft 5
is rotatably mounted around the axis l of the driven shaft 26, and the friction gear 4 is held between a pair of holding plates 10 and 11 via friction plates 6, 6.

Torque adjustment is performed by screwing the pointed torque adjustment shaft 1 back and forth. That is, when the tip of a screwdriver is inserted into the concave groove 41 at the outer end exposed to the outside of the torque adjustment shaft 1, rotated, and screwed, the tapered portion 2 presses the object to be contacted 3. This changes the direction of the pressing force at right angles. In addition to the ball, the contact object 3 may also be a circular ring pivoted to the disc 22 or a roller. Next, the contacted body 3 presses the holding disk 22, and the holding disk 22 presses the inner ring 25a of the ball hair ring 25 via the thrust hair ring 24. In other words, there is a small gap between the outer ring and the thrust bearing 24. Next, the inner ring 25a of the ball bearing 25 presses the peripheral protrusion 37 of the presser plate 10, and presses the friction plate 6 of the presser plate 10 against the friction gear 4. Since the holding plate 11 is elastically pressed by the reaction force resilient member 9, it is pressed against the friction gear 4 by reaction (via the friction plate 6). Conversely, in order to weaken the torque, the tip of the screwdriver may be similarly inserted into the groove 41 and the torque adjustment shaft 1 may be screwed back along the screw hole 40.

The rotation of the motor output shaft 5 is transmitted to the friction gear 4, and further transmitted to the driven shaft 2G via the friction plates 6, 6 and the holding plate 10.11. The rotation of the driven wheel 26 is transmitted to the rotary gear 28 by the pinion gear 27, which rotates the load sheave shaft 29, causing the load sheave 8 to rotate. 33 is a ratchet wheel, and 34 is a disc hub.

, 35 is an oil seal.

If an excessive load is applied to the load sheave 8 due to its upper and lower limits during hoisting and unwinding of the chain 42, slippage may occur on the contact surface between the friction gear 4 and the friction plates 6°6. , the rotation of the motor output shaft 5 is controlled by the presser plate 10.1.
1 and is blocked. As a result, the motor 7
is protected from burning.

It should be noted that the present invention is not limited to the above-described embodiments, and design changes may be made without departing from the gist of the present invention. for example,
Fix the friction plates 6.6 to both sides of the friction gear 4,
Between the friction plate 6 and the press plate 10, and between the friction plate 6 and the press plate 1
1, it is also desirable that if an excessive load is applied to the load sheave 8, slippage will occur and the driving force will be cut off.

〔Effect of the invention〕

Since the present invention is configured as described above, it achieves the remarkable effects described below.

■ Since the outer end of the threaded torque adjustment shaft 1 is exposed to the outside of the machine body, there is no need to remove the cover, etc., and the torque can be easily adjusted from the outside.

■ No preset torque adjustment required during assembly.

(2) Since the torque is adjusted by the contact pressure between the taper portion 2 and the object to be contacted 3, the torque can be easily adjusted, and furthermore, fine adjustment is also possible. Moreover, it can be easily adjusted using ordinary tools such as a screwdriver.

(2) Since the threaded torque adjustment shaft 1 is disposed perpendicularly to the axis l, there is no protrusion in the axis l direction, allowing for compactness in the axis direction.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a side view, and FIG. 3 is an enlarged cross-sectional plan view of essential parts for explanation. DESCRIPTION OF SYMBOLS 1... Torque adjustment shaft with thread, 2... Taper part, 3... Contacted object, 4... Friction gear, 5
...Motor output shaft, 6...Friction plate, 7...Motor, 8...Rod sheave, 9...Reaction force elastic member, 10
．． 11... Presser plate.

Claims (1)

[Claims] 1. In an electric hoisting device in which a load sheave 8 is driven by a motor 7 via a reduction gear mechanism, the motor output shaft 5
, a friction gear 4 that meshes with the motor output shaft 5 and rotates around one axis L, a pair of holding plates 10 and 11 that sandwich the friction gear 4 via friction plates 6 and 6,
A threaded torque adjustment shaft 1 is disposed perpendicularly to the uniaxial center l and has a substantially conical tapered portion 2 formed at its inner end; The contact body 3 presses the presser plate 10 toward the friction gear 4 side, and the reaction force resilient member 9 elastically presses the other presser plate 11 toward the friction gear 4 side. An electric hoisting device characterized in that the outer end of the torque adjustment shaft 1 is exposed to the outside.