JP4084350B2 - Winch with manual driving safety mechanism - Google Patents

Description

  The present invention relates to a winch with a manual operation safety mechanism that enables manual and safe operation in an emergency such as a power failure.

  The winch is equipped with an electromagnetic brake, and when the power supply to the motor is interrupted due to a power failure, the electromagnetic brake is activated and a braking force is applied to the winding body to prevent free fall of the load. . On the other hand, it is necessary to start winding using the manual handle from the state where the electromagnetic brake exerts a braking force on the winding part at the time of the power failure, and the winding part is manually rotated from the braking state. There are winches to which manual handles can be attached. When the winding portion is rotated by the manual handle from the braking state, the winch cannot be driven by the manual handle unless the brake attached to the winch, usually the electromagnetic brake, is released once.

Conventionally known auxiliary brake mechanisms include a screw brake, a disc brake using a one-way clutch, a centrifugal brake, and the like (for example, see Non-Patent Document 1). By using these auxiliary brake mechanisms, the electromagnetic brake can be brought into a released state and can be rotated by a manual handle.
Nobuo Nakane "Machine Design / Vol.7 Spring / Buffer / Brake" Seikodo Shinkosha (published April 30, 1966, 1st edition)

However, the conventional electromagnetic brake release mechanisms have the following problems. The auxiliary brakes listed below refer to auxiliary brakes that prevent a sudden drop in load when the main brake is damaged.
1. Self-holding electromagnetic brake release mechanism (When the electromagnetic brake is released, it remains mechanically released.)
(1) When the auxiliary brake is not provided:
(1-1) If the electromagnetic brake is released without attaching the manual handle, the load will drop.
(1-2) When the electromagnetic brake is released with the manual handle attached, the manual handle rotates vigorously if the hand is released from the manual handle, which makes it extremely dangerous.
(2) When an auxiliary brake is provided:
(2-1) When the braking force of the auxiliary brake is reduced, the same phenomenon as in (1-1) and (1-2) occurs.
2. Spring return type electromagnetic brake release mechanism (The electromagnetic brake is released when the release operation is performed, but when the release operation is stopped, that is, when the release lever of the electromagnetic brake is released, the electromagnetic brake is automatically activated.)
(1) When the auxiliary brake is not provided:
(1-1) If the electromagnetic brake is released without attaching the manual handle, the load will drop.
(1-2) The electromagnetic brake must be released with one hand, and the manual handle must be turned with the other hand. For this reason, both hands are blocked.
(2) When an auxiliary brake is provided:
(2-1) When the braking force of the auxiliary brake is reduced, the same phenomenon as in (1-1) and (1-2) occurs.
(2-2) The same as (1-2) above.

  To summarize the above problems, the braking state by the electromagnetic brake must be released in order to enable the rotational drive by the manual handle, and if this released state is continued for a long time, there is a risk that the load starts to fall freely.

  In the case of an emergency such as a power failure, the present invention can easily release the electromagnetic brake at the time when manual rotation driving is performed, and easily return to the braking state by the electromagnetic brake when manual rotation driving is completed. It is an object of the present invention to provide a winch with a manually driven safety mechanism.

The winch with a manual drive safety mechanism of the present invention is a winch in which a wire rope is wound around a winding portion, and the winding portion is rotationally driven by an electric motor to move the load up and down. The winch includes a shaft that serves as an axis for rotational driving, and an electromagnetic brake including an electromagnet, a return spring, an armature, a brake disk, and an inner driver, which are positioned around the shaft. When the motor is not operating, the electromagnet is not operated, the armature is pressed against the brake disc by the return spring, and the braking force is applied to the winding part. When the motor is operating, the electromagnet is operated, The armature is pulled away from the brake disc and the winding part is released. The shaft further includes fixing means for fixing the manual handle at the end thereof so as to be rotatable about the axis of the shaft, and when the armature is pressed against the brake disc, the shaft is fixed to the end of the shaft by the fixing means. the Rukoto rotating the handwheel secured so as to be rotatable on the axis of the shaft as a rotation center, and a thrust force generation mechanism that moves along the shaft of the inner driver. Then, due to the thrust force, the inner driver overcomes the force of the return spring and pulls the armature pressed against the brake disc away from the brake disc.

  According to this configuration, the electromagnetic brake is not released unless the manual handle is fixed and the manual handle is rotationally driven by hand. For this reason, operation mistakes do not occur, which is useful for preventing accidents.

  When the manual drive is finished, if the hand is released from the manual handle, the armature is pressed against the brake disc by the return spring, and the electromagnetic brake automatically enters the braking state. For this reason, an operation mistake can be eliminated and an accident occurring at the end of manual driving can be suppressed.

  Further, since the operation is performed independently of the auxiliary brake, manual driving can be performed regardless of the decrease in the braking force of the auxiliary brake.

In the present invention, the manual handle is fixed to the end of the shaft so as to be rotatable about the axis of the shaft as a rotation center, and can be driven to rotate with one hand. For this reason, it is possible to avoid a state where both hands are blocked, such that one hand is used for the electromagnetic brake release operation and the other hand is used for the manual handle rotation operation.

  In addition, the thrust force generating mechanism can be formed by a tapered surface provided on the manual handle and a tapered surface provided at the end of the inner driver that contacts the tapered surface.

  According to this configuration, the inner driver that is free to move along the axial direction of the shaft is pushed by the rotating tapered surface of the manual handle integrated with the shaft and can move inward or outward to release the electromagnetic brake. . As a result, a thrust force generating mechanism can be formed by a very simple mechanism.

The thrust force generating mechanism includes an engagement recess tapered surface provided at an end portion of the inner driver, and an engagement convex pin provided on a manual handle and contacting the taper surface while engaging with the engagement recess taper surface. Can be formed.

  With the above configuration, a thrust force can be generated with a simple structure, and the electromagnetic brake can be released.

  The electromagnetic brake includes a first electromagnetic brake and a second electromagnetic brake, and the first electromagnetic brake has a manual release mechanism for manually releasing a state in which a braking force is applied to the winding portion. The manual handle may be fixed to the end portion of the shaft, and may form a thrust force generating mechanism with the inner driver of the second electromagnetic brake.

  Next, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1A is a side view of the winch according to Embodiment 1 of the present invention, and FIG. 1B is a partial cross-sectional view of the winch with a manual handle attached thereto. In FIG. 1A, the end surface of the shaft 23 is exposed on the side surface of the winch. An inner driver 7 to be described later is attached to the shaft 23. As shown in FIG. 1B, the shaft 23 is rotationally driven by the rotation of the electric motor 21. The manual handle 11 is fixed to an end portion of the shaft 23 so as to be rotatable about the axis of the shaft 23 by a set screw 13 constituting a fixing means. Then, by turning the manual handle 11, the braking state can be released and the shaft 23 can be rotated in a state where it is not driven by the electric motor, that is, in a state where the winding portion is braked.

2A and 2B are enlarged cross-sectional views of the winch. The manual handle 11 is configured such that the male screw portion 13a of the set screw 13 is screwed into the female screw portion 23a provided at the end portion of the shaft 23, so that the manual handle 11 can rotate about the axis of the shaft 23 to the shaft 23 of the winch. Fixed. A tapered surface 14 a is formed on the end surface of the winch side of the shaft fitting member 14 that is connected to and integrated with the manual handle 11. When the manual handle 11 is fixed, the tapered surface 14 a of the shaft fitting member 14 is disposed so as to contact the tapered surface 7 a of the inner driver 7 attached to the shaft 23 . The sheet Yafuto 23 and the inner driver 7, since they are joined by sliding key (parallel key) 25, the inner driver 7 also rotates with the shaft 23. However, the inner driver 7 moves relative to the shaft 23 in the axial direction .

  In the winch 50, when an electric motor (not shown) is operating, an electric current flows through the electromagnet (coil) 5 of the electromagnetic brake 10, and an attractive force acts on the armature 3 from the coil 5. The suction force from the coil overcomes the force of the return spring 9 that presses the armature 3 against the brake disc 1 and pulls the armature 3 away from the brake disc 1. For this reason, a braking force does not act on the winding part, and the release state is realized. The load pulled by the wire rope is borne by the electric motor and moves up and down. This state is called a released state.

  On the other hand, when the electric motor is not operating, no current flows through the coil of the electromagnetic brake, and no attractive force is generated by the coil. For this reason, the armature 3 is pressed against the brake disc 1 by the action of the return spring 9. In this state, a braking force or a restraining force is applied to the winding portion to hold the load. In this state, as a matter of course, the rotation of the shaft is restricted. For this reason, the free fall of a load is prevented and safety is ensured. This state is called a braking state.

  Next, a mechanism for rotating the shaft 23 by a manual handle from a braking state will be described. In FIG. 2A, the inner driver 7 is movable along the axial direction of the shaft 23, and a mechanism that does not rotate around the shaft 23 is provided. A ball bearing 8 is disposed at the inner tip of the inner driver 7. When the shaft rotates, the inner driver 7 rotates but the armature 3 does not rotate. Therefore, when the armature 3 is pressed directly by the inner driver 7, a slip resistance is generated. The ball bearing 8 is interposed between the sliding resistance and the rolling resistance. For this reason, the resistance when turning the manual handle 11 can be reduced. When the inner driver 7 receives the force from the end and is pushed inward, the inner driver 7 is pressed against the armature 3 and the armature 3 is pulled away from the brake disc 1. For this reason, the released state is realized by pushing the inner driver 7 inward from the end side.

The manual handle 11 is fixed so that the manual handle 11 can be rotated about the axis of the shaft 23 by screwing the male screw portion 13a of the set screw 13 with the female screw portion 23a at the end of the shaft 23. If a thrust force is generated when the handle 11 is rotated and the inner driver 7 can be pushed inward, it is possible to safely shift from the braking state to the released state. This thrust force generating mechanism is provided on the tapered surface of the manual handle and the inner driver in the winch of the present embodiment.

FIG. 3 is a view of the manual handle 11 as seen from the tapered surface side. Two strip-shaped tapered surfaces 14 a are provided on the surface of the shaft fitting member 14 facing the winch. FIG. 4 is a view showing the end of the winch shaft. The shaft 23 is provided with a female screw 23a for fixing the manual handle, and an inner driver 7 is disposed on the outer periphery of the shaft. The inner driver 7 is also provided with a tapered surface 7 a so as to press against each other at a position corresponding to the tapered surface 14 a of the shaft fitting member 14. Again, the inner driver 7 is movable in the axial direction of the shaft.

  A thrust force generating mechanism in which a thrust force is applied to the inner driver 7 by the contact of the taper surface and the inner driver 7 is pushed into the inside will be described. FIG. 5 is a diagram in which the manual handle and the inner driver are arranged so that the tapered surface side can be easily seen. In FIG. 5, the tapered surface 14 a of the shaft fitting member 14 of the manual handle 11 is fixed to the distal end portion of the shaft 23 while being pressed against the tapered surface 7 a of the inner driver 7.

As shown in FIGS. 6 to 8, when the manual handle 11 fixed so as to be rotatable about the axis of the shaft 23 is rotated at the tip of the shaft , the shaft 23 and the inner driver 7 do not rotate at first. . Note that the inner driver 7 is movable along the axis of the shaft 23. Therefore, when the manual handle 11 is rotated, the tapered surface 7a pressed against the tapered surface 14a of the shaft fitting member 14 receives an inward thrust force, and the inner driver 7 moves inward along the shaft axis. To do. For this reason, the contact between the taper surface 14a and the taper surface 7a is in a state of being out of their complete contact state. That is, the state of FIG. 7 is shifted to the state of FIG. As can be seen from the above description, the thrust force generating mechanism in the present embodiment includes a tapered surface 7a, and includes an inner driver 7 that can move along the shaft 23, and a tapered surface 14a that presses against the tapered surface 7a. It is formed by the fixing mechanisms 13a and 23a of the manual handle 11.

  Next, a mechanism for pulling the armature 3 away from the brake disk 1 by overcoming the pressing force of the return spring 9 by pushing the inner driver 7 inward as a result of the operation of the thrust force generating mechanism will be described. FIG. 9 is a view showing a portion of the electromagnetic brake in a braking state when the ball bearing 8 is disposed at the inner tip portion of the inner driver 7, and FIG. 10 is a view showing a released state of the same portion. In FIG. 9, the armature 3 is pressed against the brake disc 1 by the return spring 9 to realize a braking state. The brake disc 1 is reinforced and supported by the side plate 2. On the other hand, in the state shown in FIG. 10, the inner driver 7 is pushed inward, and the ball bearing 8 overcomes the force of the return spring 9 to pull the armature 3 away from the brake disc 1. In other words, the thrust force generating mechanism is operated to push the inner driver 7 inward, thereby shifting from the braking state to the released state.

  FIGS. 11 and 12 are views in which a thrust bearing 18 is used instead of the ball bearing 8 in FIGS. 9 and 10. Even if such a thrust bearing is used, the thrust force generating mechanism can be operated to push the inner driver 7 inward, thereby shifting from the braking state to the released state.

13 to 15 show that when the manual handle is operated, the brake state (FIG. 13) is shifted to the released state (FIG. 14), and when the hand is released from the manual handle, the brake state is released (FIG. 15). It is a figure which shows shifting to. FIG. 13 shows a state where the manual handle 11 is fixed to the end of the shaft by a set screw 13 so as to be rotatable about the axis of the shaft 23 as a rotation center , and the manual handle is about to rotate. The gap a between the armature 3 and the brake disc 1 is zero, and the braking state is realized.

Then, rotating the handwheel 11, the thrust generating mechanism is operated, the inner driver 7 is pushed inward by overcoming the force of the return spring 9, the ball bearing 8 pull the armature 3 from the brake disk 1, a released state Is realized. At this time, there is a gap between the armature 3 and the brake disc 1, and if the manual handle is rotated in this state, the inner driver 7 cannot move further inward, so the manual handle 11, the inner driver 7, and The shaft 23 rotates as a unit, and the load can be moved up and down manually.

  Next, when the hand is released from the manual handle, the thrust force generating mechanism does not act on the inner driver 7. Therefore, under the force of the return spring 9, the armature 3 is pressed against the brake disc 1, the gap a between them becomes zero, and a braking state is realized.

In the above-described embodiment, the manual handle is attached to the end of the shaft so as to be rotatable about the axis of the shaft, and manually driven to rotate, so that the braking state is shifted to the released state as it is, and the winding is performed. The rotating portion can be driven to rotate, and the load can be manually moved up and down. In addition, when the manual rotation drive is stopped, it is possible to automatically shift from the release state to the braking state by the action of the return spring. As a result, it is possible to perform the above-described manual drive from the start to the end only by the rotational drive operation of the manual handle, and it is possible to eliminate the state that has been considered unfavorable in terms of safety. In other words, in a series of operations to turn the manual handle for manual operation, the brake can be automatically released and the manual operation can be performed, and when the hand is released from the manual handle, the electromagnetic brake is automatically activated. Can do. For this reason, safer manual operation can be performed in an emergency such as a power failure.

(Embodiment 2)
FIG. 16 is a diagram showing a winch with a manual operation safety mechanism according to Embodiment 2 of the present invention. FIG. 16A is a cross-sectional view of a winch with a manual driving safety mechanism, and FIG. 16B is a view showing a manual handle. The winch 50 with a manual driving safety mechanism in the present embodiment is characterized in that it has two electromagnetic brakes, a main brake 10a and an auxiliary brake 10b, as shown in FIG. The main brake 10a includes a manual release handle 31 constituting a manual release mechanism for forcibly and manually releasing the braking state. By operating this manual release handle 31, the main brake can be forcibly released.

When it is necessary to drive manually in an emergency such as a power failure, both the main brake 10a and the auxiliary brake 10b are in a braking state. In order to perform manual operation in this state, first, the manual release handle 31 is operated to forcibly shift the main brake 10a to the released state, and this released state is maintained. The gap between the main brake armature and the brake disc is maintained. Next, the manual handle is fixed to the end of the shaft so as to be rotatable about the axis of the shaft as a rotation center, and a thrust force generating mechanism is formed with the inner driver 7 involved in releasing the auxiliary brake. Therefore, the auxiliary brake 10b shifts from the braking state to the released state by the rotation operation of the manual handle, and automatically shifts from the released state to the braking state by the action of the return spring 9 as the rotation operation to the manual handle stops. To do.

17-19, when the manual brake is forcibly released by operating the manual release handle 31 and then the manual handle is operated, the auxiliary brake is released from the braking state (FIG. 17) (FIG. 18). FIG. 19 is a diagram showing a transition from the released state to the braking state (FIG. 19) when the hand is released from the manual handle. FIG. 17 shows a state in which the manual handle 11 is fixed to the end of the shaft by a set screw 13 so as to be rotatable about the axis of the shaft , and the manual handle is about to rotate. The gap a between the armature 3 of the auxiliary brake and the brake disc 1 is zero, and the braking state is realized.

Then, rotating the handwheel 11, the thrust generating mechanism is operated, the inner driver 7 is pushed inward by overcoming the force of the return spring 9, the ball bearing 8 pull the armature 3 from the brake disk 1, a released state Is realized. At this time, there is a gap between the armature 3 and the brake disc 1, and if the manual handle is rotated in this state, the inner driver 7 cannot move further inward, so the manual handle 11, the inner driver 7, and The shaft 23 rotates as a unit, and the load can be moved up and down manually.

  Next, when the hand is released from the manual handle, the thrust force generating mechanism does not act on the inner driver 7. For this reason, under the force of the return spring 9, the armature 3 of the auxiliary brake is pressed against the brake disc 1, the gap a between them becomes zero, and the braking state is realized.

In the above-described embodiment, in the winch in which two electromagnetic brakes of the main brake and the auxiliary brake are arranged, the main brake is released by the manual release mechanism, and the manual handle can be rotated about the axis of the shaft. By attaching the handle to the end of the shaft and manually rotating the handle, the braking state of the auxiliary brake can be shifted to the released state as it is, the winding portion can be driven to rotate, and the load can be manually moved up and down. . In addition, when the manual rotation drive is stopped, it is possible to automatically shift from the release state to the braking state by the action of the return spring. As a result, it is possible to perform the above-described manual drive from the start to the end only by the rotational drive operation of the manual handle, and it is possible to eliminate the state that has been considered unfavorable in terms of safety. The manual handle may be fixed to the shaft end portion before the main brake is released by operating the manual release handle.

(Embodiment 3)
FIG. 20 is a diagram showing a winch with a manual operation safety mechanism according to Embodiment 3 of the present invention. 20A is a cross-sectional view of a winch with a manual driving safety mechanism. Unlike the structure shown in FIG. 2A, the return spring 9 applies a force to the armature 3 in a direction away from the manual handle 11 to perform braking. Press against disc 1. The coil 5 exerts a force on the armature 3 in a direction approaching the manual handle 11. At the end of the inner driver 7 attached to the end of the shaft 23, an engagement recess taper surface 7b is provided. FIG. 20B is a diagram showing a manual handle. First end portion 11b of the handwheel 11, the engaging projection pin 11a is fitted, the pin 11a, so as to engage the engagement recess taper surface 7b of the inner driver 7, the manual handle 11 to the shaft 23 Installing.

FIG. 21A is a view showing the inner driver 7, and FIG. 21B is a partial view showing the manual handle 11. FIG. 22 (a) is a view of the engaging recess tapered surface 7b of the inner driver as viewed along the axis, and FIG. 22 (b) is a longitudinal sectional view. Engaging projection pins 11a provided above end 11b of the manual handle 11 is positioned to engage the engagement recess taper surface 7b of the inner driver 7. The sheet Yafuto 23 and the inner driver 7 are joined by sliding key (parallel key) 25. Therefore, the inner driver 7 also rotates with the shaft 23. However, the inner driver 7 moves relative to the shaft 23 in the axial direction .

Next, a mechanism for rotating the shaft 23 by a manual handle from a braking state will be described with reference to FIGS. 23 and 24 , the inner driver 7 is movable along the axial direction of the shaft 23, and a mechanism that does not rotate around the shaft 23 is provided. A ball bearing 8 is disposed on the inner tip end side of the winch of the inner driver 7. As shown in FIG. 24, the front end portion 11b of the manual handle 11 is inserted into the support hole 23b provided in the shaft 23, and the engaging convex pin 11a is engaged with the engaging concave tapered surface 7b. The manual handle 11 is fixed to the end portion side of the shaft 23. When the manual handle 11 fixed so as to be rotatable about the axis of the shaft 23 is rotated, the shaft 23 and the inner driver 7 are not initially rotated. When the manual handle 11 is rotated, a force is applied to the engaging recess taper surface 7b against which the engaging convex pin 11a is pressed in the rotating direction of the manual handle 11, so that the engaging convex pin 11a is pressed. A thrust force to the outside (manual handle side) acts on the applied engaging concave tapered surface 7b, and the inner driver 7 receives a force that moves outward along the shaft axis. When the inner driver 7 receives a force toward the outside (manual handle side), it pushes against the armature 3 and pulls the armature 3 away from the brake disc 1. For this reason, the release state is realized. Further, when the manual handle 11 is rotated in this state, the inner driver 7 cannot move further outward. Therefore, the manual handle 11, the inner driver 7 and the shaft 23 rotate as a unit, and the shaft and the winding portion are rotated. Rotate and manually move the load up and down. In the first and second embodiments of the present invention, the release state is realized by rotating the manual handle and pushing the inner driver inward. However, as in the present embodiment, the manual driver is rotated and the inner driver is moved outward ( The release state may be realized by pulling it out to the manual handle side).

  When the hand is released from the manual handle, the thrust force generating mechanism acts on the inner driver 7 as shown in FIG. Therefore, under the force of the return spring 9, the armature 3 is pressed against the brake disc 1, the gap a between them becomes zero, and a braking state is realized.

  While the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  By using the present invention, in the event of an emergency such as a power outage, manual operation is performed by manually releasing the braking state of the electromagnetic brake, avoiding the unsafe state that has been conventionally problematic, and then terminating the manual operation. In addition, it is possible to provide a winch with a manual operation safety mechanism that can automatically shift to a braking state.

It is a figure which shows the winch with a manual driving safety mechanism in Embodiment 1 of this invention, (a) is a side view, (b) is a fragmentary sectional view in the state which mounted | wore with the manual handle. (A) is an expanded sectional view of the winch of FIG. 1, (b) is a figure which shows a manual handle. It is a figure which shows the taper surface of a manual handle. It is a figure which shows the taper surface of the inner driver in a shaft edge part. In order to explain the thrust force generation mechanism, it is a diagram in which the tapered surfaces of the manual handle and the inner driver are arranged in an easy-to-see manner. It is a figure which shows arrangement | positioning before attaching a manual handle to a shaft edge part. It is a figure which shows the state which attached the manual handle to the shaft edge part. It is a figure which shows the state which rotated the manual handle | steering_wheel and applied thrust force to the inner driver, and pushed inside. It is a figure which shows the arrangement | positioning which has an electromagnetic brake in a braking state, when a ball bearing is arrange | positioned at an inner driver internal front-end | tip. It is a figure which shows arrangement | positioning in which an electromagnetic brake is a releasing state, when a ball bearing is arrange | positioned at the inner driver internal front-end | tip. It is a figure which shows the arrangement | positioning which has an electromagnetic brake in a braking state, when a thrust bearing is arranged at the inner driver inner end. It is a figure which shows arrangement | positioning in which an electromagnetic brake is a releasing state, when a thrust bearing is arrange | positioned at the inner driver internal front-end | tip. It is sectional drawing of the braking state of the winch with a manual driving safety mechanism of FIG. It is sectional drawing of the open state of the winch with a manual driving safety mechanism of FIG. It is sectional drawing of the state which the winch with a manual driving safety mechanism of FIG. 1 returned to the braking state from the releasing state. It is a figure which shows the winch with a manual driving safety mechanism in Embodiment 2 of this invention, (a) is sectional drawing of the winch, (b) is a figure which shows a manual handle. It is sectional drawing of the braking state of the winch with a manual driving safety mechanism of FIG. It is sectional drawing of the open state of the winch with a manual driving safety mechanism of FIG. It is sectional drawing of the state which the winch with a manual operation safety mechanism of FIG. 16 returned to the braking state from the releasing state. It is a figure which shows the winch with a manual driving safety mechanism in Embodiment 3 of this invention, (a) is sectional drawing of the winch, (b) is a figure which shows a manual handle. It is a figure which shows the arrangement | positioning before attaching a manual handle to a shaft end part, (a) is an inner-draber, (b) is a figure which shows a manual handle. (A) is the figure which looked at the engagement recessed part taper surface of the inner driver along the axis line, and figure (b) is a longitudinal cross-sectional view. It is sectional drawing of the open state of the winch with a manual driving safety mechanism of FIG. It is sectional drawing of the state which the winch with a manual driving safety mechanism of FIG. 20 returned to the braking state from the releasing state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake disc, 2 Side plate, 3 Armature, 5 Coil, 7 Inner driver, 7a Tapered surface, 7b Engagement recessed taper surface, 8 Ball bearing, 9 Return spring 10, 10a, 10b Electromagnetic brake, 11 Manual handle, 11a Engaging convex pin, 11b tip, 13 set screw, 13a male screw, 14 shaft fitting member, 14a taper surface, 21 electric motor, 23 shaft, 23a shaft end female screw, 23b support hole, 25 slip key (parallel key) ), 31 Manual release handle, 50 winches.

Claims (4)

A winch that winds a wire rope around a winding part and rotates the winding part by an electric motor to move the load up and down,
A shaft serving as a shaft of the rotational drive;
An electromagnetic brake including an electromagnet, a return spring, an armature, a brake disk and an inner driver, which are positioned around the shaft;
When the electric motor is not operated, the electromagnet is not operated, the armature is pressed against the brake disk by the return spring to apply a braking force to the winding portion, and the electromagnet is operated while the electric motor is operating. And overcoming the force of the return spring and pulling the armature away from the brake disc to release the winding part,
The shaft includes a fixing means for fixing a manual handle at an end thereof so as to be rotatable about the axis of the shaft as a rotation center ,
When the armature is pressed against the brake disc, wherein The inner driver and the manual handle, the inner driver by Rukoto rotates the manual handle which is fixed to the shaft end by said fixing means to the shaft Equipped with a thrust force generation mechanism that moves along
A winch with a manual drive safety mechanism in which the inner driver overcomes the force of the return spring by the thrust force and pulls the armature pressed against the brake disc away from the brake disc.   2. The manual drive safety according to claim 1, wherein the thrust force generation mechanism is formed by a tapered surface provided on the manual handle and a tapered surface provided at an end portion of the inner driver in contact with the tapered surface. Winch with mechanism. The thrust force generating mechanism is formed by an engagement concave taper surface provided at an end portion of the inner driver and an engagement convex pin provided in the manual handle and contacting the engagement concave taper surface. The winch with a manual drive safety mechanism according to claim 1 .   The electromagnetic brake includes a first electromagnetic brake and a second electromagnetic brake, and the first electromagnetic brake includes a manual release mechanism that manually releases a state in which a braking force is applied to the winding portion. The winch with a manual drive safety mechanism according to any one of claims 1 to 3, wherein the manual handle is fixed to an end of the shaft and forms an inner driver of the second electromagnetic brake and the thrust force generating mechanism. .

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