JP2846631B2 - Manual release device for braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a manual release device for a braking device.

[0002]

2. Description of the Related Art Conventionally, as a braking device used for a hoist such as an elevator, a brake shoe presses a disk by an elastic force of a spring in an electromagnet portion to brake when a power supply is turned off. When the power is turned on, the electromagnet section operates against the resilience of the spring, and the brake shoe is released from the disc in a non-braking state (open state).
The structure was as follows.

[0003]

However, when a power failure occurs, the elevator or the like stops, and even if the braking device is switched (slowly) to the non-braking state (open state), if the electricity is not conducted, it will not be possible. It is possible.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention abuts on a connecting shaft detachable from a guide pin of an electromagnet portion of a braking device and an outer end surface of a fixed core of the electromagnet portion. A fixed plate having a contact surface on one surface and a ball holding surface on the other surface having a shallow conical recess arranged in a petal shape as viewed from the axial direction, and indirectly or directly externally fitted to the connection shaft; A ball holding surface having a shallow conical concave portion that is mounted as a shape, faces the ball holding surface of the fixed plate, and is arranged in a petal shape when viewed from the axial direction, and a manual lever is protruded. A rotary operation panel,
The rotary operation panel is interposed between the facing ball holding surfaces and is moved between the concave portion and the crest therebetween by the rotation of the rotary operation panel to change the gap size between the ball holding surfaces. And a ball that reciprocates in the axial direction.

A screw hole is formed in the end surface of the guide pin of the electromagnet portion, and a male screw portion screwed into the screw hole is provided at the tip of the connection shaft, and the connection shaft is detachably connected to the guide pin. did. Further, an uneven rotation preventing mechanism is provided at a portion where the contact surface of the fixed plate and the outer end surface of the fixed iron core contact each other. In addition, the unevenness rotation preventing mechanism includes a bolt head protruding from the outer end surface of the fixed iron core, and a concave portion formed on the contact surface of the fixed plate so that the bolt head fits.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments. The plan view shown in FIG. 1 shows an example of a hoisting machine to which the manual opening device A (see FIG. 5) according to the present invention is applied, and 2 is a winding drum (hoisting drum), and a motor (not shown) The winding drum 2 is rotationally driven via a speed reducer, a coupling and the like.

The winding shaft 2 has a support shaft 7 rotatably supported by a pair of bearings 8 and 9. The first bearing 8 pivotally supports the input shaft portion 7a connected to the above-described drive side, and the second bearing 9 pivotally supports the other projecting shaft portion 7b.

Reference numeral 3 denotes a braking device, and an annular flat disk 11 is fixed to one end (the left end in FIG. 1) of the winding drum 2.
Also, a unit 14 including a caliper 12 and an electromagnet unit 13
Is attached to the mounting member 15 so that it can float in a minute dimension. In the illustrated example, the mounting member 15 is constituted by the body of the bearing 9 itself. (Of course, the attachment member 15 may be formed by a separate member.) 17 is a floating pin. Unit 14
The whole is held by the floating pin 17 so as to be movable by a small dimension in the direction of arrow B. Although two units 14 are provided in the example of FIG. 1, it is also possible to use a single unit.

Next, FIGS. 2 to 4 illustrate the braking device 3 more specifically. The caliper 12 has a groove 19 into which the outer peripheral edge of the disk 11 is inserted. And a pair of brake shoes 20, 20, which brake the disc 11 by pressing the disc 11 from both sides.

An adjusting screw 25 with a lock nut is provided on one side surface of the substantially gate-shaped caliper body 12a, and a push rod 26 of the electromagnet section 13 is provided on the other side surface. Centripetal fitting
Each brake shoe 20 is attached to the tip of the adjusting screw 25 / push rod 26 via the 27 or the like so as to be able to swing. The push rod 26 is fixed to the movable iron core 28 of the electromagnet section 13 and reciprocates integrally. The push rod 26 is loosely inserted into a through hole of the caliper body 12a.

The electromagnet section 13 has a fixed iron core 33 and a disk-shaped movable iron core 28. An electromagnetic coil 34 is wound around the fixed iron core 33, and the fixed iron core is fixed by a plurality of mounting bolts 35. The coil 33 and the coil 34 are connected and fixed to the caliper body 12a, and do not move relatively.

A guide pin 37 is inserted into a shaft hole 36 of the fixed iron core 33 so as to be slidable in the axial direction.
Then, the push rod 26 and the movable core 28 are integrally fixed. 3 and 4, the push rod 26 is provided with a small-diameter shaft portion (to the left in the drawing) and a male screw is formed at the tip (the left end in the drawing) of the small-diameter shaft portion. By screwing a male screw into the female screw hole 29 at one end of the guide pin 37, the push rod 26 is connected and fixed to the guide pin 37,
Further, the movable iron core 28 is fixed in a sandwiched manner.

A screw hole 30 is formed in the other end face (left end face in FIG. 4) of the guide pin 37. Reference numerals 38a and 38b denote braking springs, which are housed in the fixed iron core 33 and resiliently urge the movable iron core 28 in the direction of arrow E. One spring 38
a is a fixed type, the other spring 38b is adjustable, and the braking force can be adjusted by the braking force adjusting screw 39.
When the electromagnetic coil 34 is energized, the movable iron core 28 is attracted and moves in the direction of the arrow G, and the brake shoes 20, 20 (the pad portions thereof) are released from the disk 11 to be in a non-braking state.

That is, when the power supply is off, the electromagnetic coil 34 is turned off (by an electric circuit), and the brake shoes 38a and 38b are resiliently biased by the spring force.
20 and 20 clamp the disk 11 and brake it.
When the power is turned on, the electromagnetic coil 34 is simultaneously excited (energized), the movable iron core 28 moves in the direction of arrow G, and is brought into a non-braking state (open state) (this operation is the same as the conventional one).

The manual opening device A according to the present invention
As shown in FIG. 4 to FIG. 7, a connection shaft 40, a fixed board 41, a rotary operation board 42, balls 43, and a fixed cylindrical body 48 are provided. The connecting shaft 40 is a guide pin of the electromagnet section 13 of the braking device 3 described above.
In the illustrated example (shown in FIGS. 3 to 7), a male screw part 40a screwed into a screw hole 30 formed in the end face of the guide pin 37 is provided. Provided,
The male screw portion 40a is connected to and detached from the screw hole 30 so as to be detachable.

The fixed platen 41 is shown in FIGS. 4 to 7 and FIGS.
As shown in FIG. 12, the outer end surface 33a of the fixed iron core 33 of the electromagnet portion 13
And a ball holding surface 45 on the other surface. The ball holding surface 45 has a shallow conical concave portion 46 which is arranged in a petal shape when viewed from the direction of the axis F.
... More specifically, a shallow circular concave portion 47 is formed on the other surface of the fixed platen 41, and six concave portions 46 are provided on a surface corresponding to the bottom surface of the concave portion 47, and a ball holding surface 45 is provided. And

Further, the fixed platen 41 has a hole 49 through which a fixed cylindrical body 48 is inserted, and the contact surface 44 and the outer end surface 33a of the fixed iron core 33 contact each other. An uneven rotation prevention mechanism H is provided at the site (see FIG. 4). Specifically, the uneven rotation preventing mechanism H includes a head 35a of a bolt 35 protruding from the outer end surface 33a of the fixed iron core 33, and a bolt head 35a
And a concave portion 50 formed on the contact surface 44 of the fixed platen 41 so that they fit.

As shown in FIG. 12, the concave recesses 50 are formed by connecting four circles (semi-elliptical) arranged equally around the axis F with a large circle at the center. A certain cross-shaped connecting recess is formed. If the number of bolt heads 35a projecting from the outer end surface 33a of the fixed iron core 33 is two or four, concave recesses 50 having a shape as shown in FIG. 12 are preferable.

Next, as shown in FIGS. 4 and 5, the rotary operation panel 42 is indirectly connected to the connecting shaft 40 {indirectly via the fixed cylinder 48 or the like}. The manual lever 51 is provided to be mounted. That is, FIGS.
As shown in FIG. 5, the rotary operation panel 42 has an axial center through hole 52, through which a fixed cylindrical body 48 is inserted, and through which small fixed balls 53 for reducing frictional force are provided (see FIG. 4). It is attached to the 33 side as a press. The manual lever 51 has a male screw at its base end, and a screw hole is provided in the rotary operation panel 42, and the manual lever 51 is attached by screwing both.

The rotary operation panel 42 has a ball holding surface 54 on a side of the fixed plate 41 facing the ball holding surface 45. The ball holding surface 54 has, like the ball holding surface 45 described above, a concave portion 55 arranged in a petal shape when viewed from the axis F direction.
... The recess 55 has a shallow conical shape (as in FIG. 8).

As the balls 43, steel balls or the like are used, and the balls 43 are interposed between the facing ball holding surfaces 45, 54, and the rotation of the rotary operation panel 42 (see FIGS. 4 and 5). With reference to arrow M, the gap between the ball holding surfaces 45 and 54 is changed by moving between the concave portions 46 and 55 and the ridges 56 and 57 therebetween, as shown in FIG. Rotating operation panel 42, fixed cylinder 48, connecting shaft
40 is reciprocated in the direction of the axis F.

That is, FIG. 13 is an expanded view of FIG. 4 (FIG. 5) along a cylindrical surface including all the centers of the six balls 43. In FIG. 13A, the ball 43 is located between the shallow conical concave portions 46 and 55, and the braking device 3 is in a braking state. When the lever 51 is manually rotated in the direction of arrow M, the ball 43 is moved from the concave portions 46 and 55 to the peak portions 56 and 57 as shown in FIG.
Then, the rotary operation panel 42 is turned to the arrow J
In the direction, and through the small ball 53, the cylindrical body 48 and the connecting shaft 40
The guide pin 37 also moves in the same direction, the movable iron core 28 moves in the direction of arrow G, and the brake shoes 20
Is switched (by manual force) to the non-braking state in which the pad portion is released. If you release your hand from the manual lever 51, the spring 38
The state shown in FIG. 13 (b) is restored to the state shown in FIG.

In FIG. 8, a shallow recess 58 into which the flange of the cylindrical body 48 is fitted is formed on the outer end surface of the rotary operation panel 42, and the small balls 53 shown in FIG. Recessed peripheral groove 59 is formed.

It is to be noted that the connecting shaft 40 may be freely formed by integrating the cylindrical body 48 with the bolt (not shown).
In this case, the rotary operation panel 42 is directly attached to the connection shaft 40 as an external fitting. Note that the manual opening device A according to the present invention is disposed near the hoist,
It is detachably mounted and used when emergency braking is to be turned off when a power failure occurs.

[0025]

According to the present invention, the following significant effects can be obtained by the above-described structure.

[0026] According to the first aspect, when the braking device 3 cannot be turned off electrically at the time of the occurrence of a power failure, the braking device 3 is easily attached to the guide pin 37 (if necessary) to manually set the non-braking state. Switching is possible, which is useful for emergencies. By the shallow conical recesses 46, 55 and the balls 43, with a light operating force (rotating torque),
Switching to a non-braking state is possible. (According to claim 1) It is compact and lightweight, and can be easily arranged near the hoist.

According to the second aspect, it is not necessary to add a component to the brake device 3 side, and the connection and disconnection can be easily and quickly performed if the screw hole 30 is simply provided.

According to the third aspect, since the fixed platen 41 does not rotate with respect to the outer end surface 33 a of the fixed iron core 33, reliable lever operation is possible.

[0029] According to the fourth aspect, the bolt heads 35a projecting from the normal fixed iron core 33 can be effectively utilized to easily stop the rotation.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a hoist.

FIG. 2 is a side view of an example of a braking device.

FIG. 3 is a sectional view of a braking device.

FIG. 4 is a diagram illustrating how to use a manual opening device.

FIG. 5 is a half sectional front view showing an embodiment of the present invention.

FIG. 6 is a left side view.

FIG. 7 is a right side view.

FIG. 8 is a sectional front view of a rotary operation panel.

FIG. 9 is a side view thereof.

FIG. 10 is a sectional front view of a fixed board.

FIG. 11 is a left side view thereof.

FIG. 12 is a right side view thereof.

FIG. 13 is an operation explanatory diagram.

[Explanation of symbols]

 3 Braking device 13 Electromagnet part 30 Screw hole 33 Fixed iron core 33a Outer end face 35a Bolt head 37 Guide pin 40 Connecting shaft 40a Male screw part 41 Fixed board 42 Rotary operation board 43 Ball 44 Contact surface 45 Ball holding surface 46 Recess 50 Recess Recess 51 Manual lever 54 Ball holding surface 55 Recess 56 Mountain 57 Mountain F

Claims (4)

(57) [Claims] 1. A guide pin (37) of an electromagnet section (13) of a braking device (3).
And a contact surface 44 for contacting the outer end surface 33a of the fixed iron core 33 of the electromagnet portion 13 and a petal-like shallow cone arranged in a petal shape when viewed from the axis F direction. A fixed plate 41 having a ball holding surface 45 having a concave portion 46 on the other surface, and a ball holding surface 45 of the fixed plate 41 which is mounted indirectly or directly on the connecting shaft 40 as an external fitting.
And a rotary operation panel 42 having a ball holding surface 54 having a shallow conical concave portion 55 arranged in a petal shape when viewed from the direction of the axis F and having a manual lever 51 protruding therefrom. It is interposed between the ball holding surfaces 45 and 54 and the concave portions 46 and 55 and the peak portions 56 and 57 therebetween by the rotation of the rotary operation panel 42.
And a ball 43 for moving the rotary operation panel 42 back and forth in the axial direction by changing the gap size between the ball holding surfaces 45 and 54 by moving the rotary operation panel 42 in the axial direction. Manual opening device. 2. A screw hole 30 is formed in an end surface of the guide pin 37 of the electromagnet portion 13, and a male screw portion 40 screwed into the screw hole 30.
a is provided at the tip of the connecting shaft 40, and the connecting shaft 40 is
The manual release device for a braking device according to claim 1, wherein the manual release device can be connected to and disconnected from the brake device. 3. The braking device according to claim 1, wherein the contact surface 44 of the fixed platen 41 and the outer end surface 33a of the fixed iron core 33 are provided with an uneven rotation preventing mechanism H at a position where they contact each other. Manual opening device for the device. 4. A bolt head 35a protruding from an outer end surface 33a of a fixed iron core 33, and
4. The manual release device for a braking device according to claim 3, further comprising a recessed portion 50 formed on the contact surface 44 of the fixed board 41 so that the engagement portion 35a is fitted.