JP5428640B2 - Elevator governor - Google Patents

Description

  The present invention relates to a speed governor for emergency stopping a car when the speed of the car exceeds a predetermined threshold in an elevator, and more particularly to a speed governor installed in a hoistway in a machine room-less elevator. .

  Conventionally, in a machine room-less elevator, as shown in FIG. 16, a drive device (100) is installed in an upper part of a hoistway (107), and a sheave (101) constituting the drive device (100) is provided. The main rope (102) is wound around, and the car (103) is connected to one end of the main rope (102), and the counterweight (104) is connected to the other end of the main rope (102).

In the hoistway (107), a guide rail (105) for guiding the raising and lowering of the car (103) is installed. An emergency stop device (90) is attached to the bottom of the car (103) to emergency stop the car (103) by braking against the guide rail (105).
A governor support member (106) is fixed in the vicinity of the upper end of the guide rail (105), and an abnormal speed of the car (103) is detected on the governor support member (106). A speed governor (9) for operating the stop device (90) is supported.

  The governor (9) includes a sheave (91) supported so as to be rotatable about a horizontal axis. A pulley (92) is supported near the lower end of the guide rail (105), and an endless governor rope (93) is stretched between the sheave (91) and the pulley (92). . The governor rope (93) is connected to the emergency stop device (90) via the lever (94). During normal operation, the governor rope (93) circulates and moves as the car (103) moves up and down.

  The governor (9) further includes a braking mechanism that brakes the governor rope (93) wound around the sheave (91), and the braking mechanism is moved from a non-operating state (non-braking state) to an operating state (braking state). The sheave (91) is provided with a fly weight that rotates by receiving centrifugal force according to the rotation of the sheave (91), and the amount of rotation of the fly weight exceeds a predetermined amount. The trip mechanism is sometimes operated and the governor rope (93) is braked by the braking mechanism, thereby operating the emergency stop device (90) as will be described later.

  When the speed of the car (103) increases abnormally for some reason and exceeds a predetermined threshold (1.4 times the rated speed), the governor (9) is activated and the governor rope (93 ) Is applied to the circular movement. This causes a relative movement between the governor rope (93) and the emergency stop device (90), and this relative movement causes the lever (94) to operate, resulting in the operation of the emergency stop device (90). The car (103) comes to an emergency stop.

A landing door (108) is provided at each landing (109), and an inspection opening (111) is provided at the wall (110) of the top floor landing (109).
When checking the operation of the speed governor (9) and emergency stop device (90), or when returning the speed governor (9) after the speed governor (9) has been activated due to overspeed of the car (103) The worker accesses the speed governor (9) from the landing (109) side through the inspection opening (111).

When checking the operation of the governor (9) and emergency stop device (90), the trip mechanism of the governor (9) is operated by manual operation with the car (103) stopped. The emergency stop device (90) is checked for normal operation by lowering the car (103).
When the speed governor (9) and the emergency stop device (90) are to be returned after the operation is confirmed, the car (103) is first lifted slightly, thereby causing the emergency stop device (90) to move relative to the guide rail (105). After releasing the brake, the trip mechanism of the governor (9) is returned to the original state by manual operation while the car (103) is stopped. As a result, the braking mechanism shifts to a non-braking state.

  There has also been proposed a speed governor capable of returning work by remote operation of an operator (Patent Document 1). The speed governor is provided with a return lever capable of swinging about an axis parallel to the rotation axis of the sheave. By pulling a return wire connected to the return lever, the return lever Is swung to a predetermined angle. In this state, by raising the car and rotating the sheave, the trip mechanism provided on the sheave is pressed by the return lever to return to the original state. As a result, the braking mechanism shifts to a non-braking state.

JP 2002-370879 A

However, in the conventional elevator provided with the inspection opening (111) in the wall (110), not only the construction for the wall (110) is required, but the inspection opening (111) is formed at the landing door ( 108), the speed governor (9) is located deeper than the inspection opening (111), and there is a problem that the workability of the inspection work is poor.
Although it is possible for a worker to go up to the ceiling of the car (103) and access the speed governor (9) without providing the inspection opening (111), there is a safety problem or a work space problem. There is.

  In a conventional elevator provided with a return lever on the speed governor, the speed governor can be returned by remote control of the return lever. However, the speed of the car is a predetermined threshold (1.4 of the rated speed). Depending on the rotation angle and orientation of the sheave when the sheave stops exceeding (times), that is, the position of the trip mechanism, the sheave can be pushed up to about 360 degrees in order to press the trip mechanism with the return lever after the return lever is operated. If it is necessary to rotate and the car is stopped near the landing on the top floor, there may be no room to rotate the sheave by a required angle. There was a problem that could not be restored.

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide an elevator governor that can easily and safely perform inspection work by remote control without providing an inspection opening.
A second object of the present invention is to provide an elevator governor that can be automatically returned by simply rotating the sheave when the trip mechanism operates when the speed of the car exceeds a predetermined threshold. is there.

The first elevator governor according to the present invention is arranged at a certain height in the hoistway (107), and when the speed of the car (103) exceeds a predetermined threshold, the car (103) Actuates the attached emergency stop device (90),
The sheave (2) is rotatably supported by a frame (10) provided at a certain height in the hoistway (107) and brakes the governor rope wound around the sheave (2). The sheave (2) is provided with a flyweight mechanism that rotates by receiving centrifugal force according to the rotation of the sheave (2), and the sheave (2) is provided between the flyweight mechanism and the brake mechanism. Is provided with a trip mechanism that shifts the braking mechanism from the non-operating state to the operating state when the amount of rotation of the flyweight mechanism exceeds a predetermined amount, and the trip mechanism has a remote control device via a wire (13). (11) is connected, and the remote control device (11) is operated while the car (103) is descending to generate a relative movement between the governor rope (93) and the emergency stop device (90). The emergency stop device (90) can be activated.

  In the speed governor of the present invention, when the wire (13) is pulled by operating the remote control device (11) while the car (103) is descending, the trip mechanism is operated and the braking mechanism is in a non-operating state. Transition to the operating state. As a result, the circulating movement of the governor rope (93) is braked, and a relative movement occurs between the governor rope (93) and the emergency stop device (90). As a result, the emergency stop device (90) is activated and the car (103) is stopped.

In a specific aspect, the braking mechanism includes:
A ratchet (3) pivotally supported on the frame (10) coaxially with the rotating shaft (20) of the sheave (2) and having a large number of teeth (31) on the outer periphery;
A brake shoe (41) connected to the ratchet (3) via a connecting lever (43) and approaching and separating from the outer peripheral surface of the sheave (2) as the ratchet (3) rotates.
And has.
The trip mechanism is
It is pivotally supported by the sheave (2), has a claw portion (52) to be engaged with the tooth (31) of the ratchet (3) at one end portion, and has a latch receiving portion (51) at the other end portion. Claw member (5);
First urging means for urging the claw member (5) in the meshing direction with the ratchet (3);
It is pivotally supported by the sheave (2), and is engaged with the latch receiving portion (51) of the claw member (5) at one end portion so that the claw portion (52) of the claw member (5) is removed from the ratchet (3). A trip lever (6) having a locking portion (62) to be held in the disengaged position and having a cam follower (61) at the other end;
A second biasing means for biasing the trip lever (6) in the direction of engagement with the claw member (5);
A trigger member (8) pivotally supported by the frame (10) and having a cam surface (81) slidably contactable with the cam follower (61) of the trip lever (6)
And has.
The remote control device (11) is connected to the trigger member (8) via the wire (13), and the cam surface (81) of the trigger member (8) is connected to the cam follower (61) of the trip lever (6). It approaches and separates from it.

  In the specific embodiment, during normal operation, the locking portion (62) of the trip lever (6) locks the locking receiving portion (51) of the claw member (5), and the claw of the claw member (5). The part (52) is separated from the teeth (31) of the ratchet (3). As a result, the sheave (2) rotates freely according to the raising and lowering of the car (103).

  When the remote control device (11) is operated and the wire (13) is pulled while the car (103) is descending, the trigger member (8) rotates and the cam surface (81) is the cam of the trip lever (6). Contact the follower (61). As a result, the trip lever (6) rotates against the biasing force of the second biasing means, and the locking part (62) is disengaged from the locking receiving part (51) of the claw member (5). Accordingly, the claw member (5) is urged by the first urging means, and the claw portion (52) meshes with the teeth (31) of the ratchet (3).

In this state, when the sheave (2) rotates as the car (103) descends, this rotation is transmitted to the ratchet (3) via the claw member (5). The braking shoe (41) is pulled by the rotational torque of the ratchet (3), and the braking shoe (41) is pressed against the governor rope (93) wound around the sheave (2), and the governor rope ( Braking the circulating movement in 93).
As a result, a relative movement occurs between the governor rope (93) and the emergency stop device (90), whereby the emergency stop device (90) is operated and the car (103) is stopped.

The second elevator governor according to the present invention is arranged at a certain height position in the hoistway (107), and the car (103) when the speed of the car (103) exceeds a predetermined threshold value. ) Actuates an emergency stop device (90) attached to
The sheave (2) is rotatably supported by a frame (10) provided at a certain height in the hoistway (107) and brakes the governor rope wound around the sheave (2). The sheave (2) is provided with a flyweight mechanism that rotates by receiving centrifugal force according to the rotation of the sheave (2), and the sheave (2) is provided between the flyweight mechanism and the brake mechanism. Includes a trip mechanism that shifts the braking mechanism from the non-operating state to the operating state when the amount of rotation of the flyweight mechanism exceeds a predetermined amount,
For members whose rotation in the same direction as the car ascending rotation of the sheave (2) is restricted at least in the operating state of the braking mechanism, one or more on the circumferential line around the rotation axis (20) of the sheave (2) A trip release lever (7) is connected to the trip mechanism, and the trip release lever (7) protrudes toward the inside of the circumferential line. The trip release lever (7) is held in a retracted position in which the convex portion (71) is retracted from the circumferential line when the trip mechanism is not operating the braking mechanism. In the state where the trip mechanism operates the braking mechanism, the projecting portion (71) is set to an advance position where the projecting part (71) is advanced on the circumferential line,
The trip release lever (7) has its convex part (71) pressed by one projecting piece (33) as the sheave (2) moves up and down at the advance position, and the advance position of the trip release lever (7) The trip mechanism is operated in the reverse direction by the movement toward the retracted position, and the braking mechanism is returned from the operating state to the non-operating state.

In the speed governor of the present invention, in the normal operation in which the braking mechanism is held in the non-braking state by the trip mechanism, the trip release lever (7) is held in the retracted position, and the convex portion (71) is the protruding piece (33 ) Is receding from the circumference line where it is arranged.
Therefore, the trip release lever (7) does not collide with the projecting piece (33) as the sheave (2) rotates.

When the speed of the car (103) exceeds a predetermined threshold or when the trip mechanism shifts the braking mechanism from the non-braking state to the braking state to confirm the operation, the trip release lever (7) is set to the advanced position. Then, the convex portion (71) advances onto the circumferential line on which the projecting pieces (33) are arranged.
In this state, when the car (103) is slightly raised and the sheave (2) is slightly rotated, the projecting portion (71) of the trip release lever (7) at the advanced position is caused by one projecting piece (33). Is pressed, and the trip release lever (7) is driven. As a result, the trip mechanism operates in the reverse direction to return the braking mechanism from the braking state to the non-braking state.

In a specific aspect, the braking mechanism includes:
A ratchet (3) pivotally supported on the frame (10) coaxially with the rotating shaft (20) of the sheave (2) and having a large number of teeth (31) on the outer periphery;
A brake shoe (41) connected to the ratchet (3) via a connecting lever (43) and approaching and separating from the outer peripheral surface of the sheave (2) as the ratchet (3) rotates.
And has.
The trip mechanism is
It is pivotally supported by the sheave (2), has a claw portion (52) to be engaged with the tooth (31) of the ratchet (3) at one end portion, and has a latch receiving portion (51) at the other end portion. Claw member (5);
First urging means for urging the claw member (5) in the meshing direction with the ratchet (3);
It is pivotally supported by the sheave (2), and is engaged with the latch receiving portion (51) of the claw member (5) at one end portion so that the claw portion (52) of the claw member (5) is removed from the ratchet (3). A trip lever (6) having a locking portion (62) to be held in the released position;
A second biasing means for biasing the trip lever (6) in the direction of engagement with the claw member (5);
And has.
The trip release lever (7) is connected to the claw member (5). The one or more projecting pieces (33) are provided on a member fixed to the ratchet (3).

  According to the specific aspect, when the trip release lever (7) is driven by the projecting piece (33), the claw member (5) is rotated with the rotation of the trip release lever (7), and the claw portion (52) is disengaged from the teeth (31) of the ratchet (3), and the latch receiving part (51) is engaged with the latching part (62) of the trip lever (6), and the trip lever (6) The claw member (5) is held at a position detached from the ratchet (3). As a result, the ratchet (3) is free to rotate, the braking shoe (41) is separated from the outer peripheral surface of the sheave (2), and the braking on the governor rope wound around the sheave (2) is released. The

  In another specific embodiment, the trip release lever (7) is pivotally supported by a support base (74) attached to the claw member (5) so as to be rotatable within a certain angular range, and in the advanced position. The sheave (2) is urged to rotate in the direction opposite to the direction of rotation when the convex portion (71) is pressed by the one projecting piece (33) as the car rises.

  According to the specific embodiment, the impact caused by the collision between the convex portion (71) of the trip release lever (7) and the projecting piece (33) during the return operation is counteracted by the urge of the trip release lever (7). It is eased by movement.

  In a more specific form, the protrusion (71) of the trip release lever (7) has a protruding piece (33) as the sheave (2) is raised and rotated at the advanced position of the trip release lever (7). The first pressing receiving surface (72) to which the projecting member should abut and the second pressing to which the projecting piece (33) should abut as the sheave (2) moves downward in the advance position of the trip release lever (7) A receiving surface (73) is formed, and the second pressing receiving surface (73) has a smaller contact angle with the projecting piece (33) than the first pressing receiving surface (72).

  According to the specific embodiment, the speed of the car (103) exceeds a predetermined threshold value, the trip lever (6) rotates, and the claw member (5) rotates toward the meshing position with the ratchet (3). Even if the projection (71) of the trip release lever (7) moves to a position where it can collide with the projecting piece (33) as the pawl member (5) rotates, the sheave (2) Although the projecting piece (33) is in sliding contact with the second pressure receiving surface (73) of the trip release lever (7) by the car descending rotation, the contact angle of the second pressure receiving surface (73) is small, so the trip release lever (7) is only slightly rotated by a small force and does not cause any trouble in the downward rotation of the sheave (2). Therefore, the braking operation of transmitting the car descending rotation of the sheave (2) to the ratchet (3) and pulling the braking shoe (41) by the torque of the ratchet (3) to brake the governor rope is normally performed. Executed.

According to the first elevator governor according to the present invention, it is possible to easily and safely perform an inspection operation by remote operation without providing an inspection opening on the wall of the landing.
Further, according to the second elevator governor according to the present invention, when the trip speed is operated when the speed of the car exceeds a predetermined threshold, the governor can be automatically returned by simply rotating the sheave. I can do it. In particular, when a plurality of projecting pieces are deployed, automatic return can be realized by rotating the sheave slightly, regardless of the sheave rotation angle and posture when the speed of the car exceeds a predetermined threshold and the sheave stops. I can do it.

FIG. 1 is a perspective view of a speed governor according to the present invention. FIG. 2 is a side view of the speed governor according to the present invention. FIG. 3 is a side view showing a portion to which the remote control device is connected. FIG. 4 is a side view showing a main part of the governor at the start of the trip operation. FIG. 5 is a side view showing a main part of the governor at an intermediate point in the trip operation. FIG. 6 is a side view showing the main part of the governor at the end of the trip operation. FIG. 7 is another side view showing the main part of the governor at the start of the trip operation. FIG. 8 is another side view showing the main part of the governor at the intermediate point of the trip operation. FIG. 9 is another side view showing the main part of the governor at the end of the trip operation. FIG. 10 is a side view showing a main part of the governor at the start of the trip release operation. FIG. 11 is another side view showing the main part of the governor at the start of the trip canceling operation. FIG. 12 is a side view showing a main part of the governor at an intermediate point in the trip release operation. FIG. 13 is a side view showing a main part of the governor at the end of the trip release operation. FIG. 14 is a diagram illustrating the radial distance from the center of rotation of the trip release lever to the contact point with the protruding piece. FIG. 15 is a side view showing a contact state between the trip release lever and the projecting piece during the trip operation. FIG. 16 is a diagram illustrating an installation state of the governor in the machine room-less elevator.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
In the elevator governor according to the present invention, when the speed of the car reaches the first threshold (1.3 times the rated speed), the electric contact is cut off and the brake is operated, and the car does not stop thereafter. When the speed of the car reaches the second threshold value (1.4 times the rated speed), the emergency stop device is activated by a trip operation described later, and the car is emergency stopped.
A description of the specific operation when the car speed reaches the first threshold (1.3 times the rated speed) will be omitted.

1. Overall Configuration As shown in FIG. 1, the speed governor (1) includes a U-shaped frame (10) to be supported at the upper part in the elevator hoistway, and a speed governor rope is attached to the frame (10). The sheave (2) to be wound is rotatably supported by the horizontal rotating shaft (20), and the swing arm (4) approaches the outer peripheral surface of the sheave (2) at its base end. It is pivotally supported so that it can be separated. The swinging arm (4) is provided with a braking shoe (41) that is in contact with the governor rope wound around the sheave (2) and that is opposed to the outer peripheral surface of the sheave (2). Yes.

  To the governor (1), two remote control devices (11) and (12) to be operated from the landing side during maintenance inspection are connected. One remote control device (12) restores the above-mentioned electrical contacts, and the other remote control device (11) is operated remotely for the purpose of confirming the operation of the governor (1) and emergency stop device. Is for forcing the governor (1) to trip.

  A flexible tube (15) (16) extends between the remote control device (11) (12) and the frame (10) of the governor (1), and the tube (15) (16 ) Are inserted with metal wires (13) and (14), and one ends of the wires (13) and (14) are connected to the remote control devices (11) and (12), respectively, and the wires (13 ) (14) are connected to the movable portions (82) and (19) provided on the frame (10), respectively. The movable parts (82) and (19) are urged by the coil springs (17) and (18) in the direction opposite to the operation direction of the remote control devices (11) and (12).

  Therefore, when the remote control device (11) (12) is operated to pull the wire (13) (14), the movable part (82) (19) moves against the bias of the coil springs (17) (18). Thereafter, when the operating force applied to the remote control devices (11) and (12) is released, the movable portions (82) and (19) are returned to their original positions by the bias of the coil springs (17) and (18).

2. 2. Braking mechanism and trip mechanism and their operation As shown in FIG. 2, the sheave (2) rotates clockwise in FIG. 2 as the car rises and counterclockwise in FIG. 2 as the car descends. It will rotate. Hereinafter, the rotation of the sheave (2) when the car is raised is referred to as up / down rotation on the car, and the rotation of the sheave (2) when the car is lowered is referred to as car down rotation.

On the side of the sheave (2), a pair of flyweights (21) and (21) that are rotated by receiving centrifugal force according to the rotation of the sheave (2) are provided. The link 22 is connected to each other, and an urging force against the centrifugal force is given by the balance spring 23 shown in FIG.
Therefore, when the rotational speed of the sheave (2) increases, the pair of flyweights (21) and (21) receive centrifugal force corresponding to the rotational speed and rotate in the expanding direction, and the centrifugal force and the balance spring (23). The urging force is set to a balanced posture.

On the frame (10), a ratchet (3) having a large number of teeth (31) around it is coaxially supported with the rotating shaft (20) of the sheave (2).
A shaft (44) passes through the upper end of the swing arm (4), and the tip of the shaft (44) is connected to the side surface of the ratchet (3) via the connecting lever (43). A spring receiving member (45) is attached to the base end of the shaft (44), and a coil spring (42) is interposed between the upper end of the swing arm (4) and the spring receiving member (45). Yes.

Accordingly, when the ratchet (3) is driven to rotate counterclockwise, the connecting lever (43) and the shaft (44) are pulled leftward by the rotational torque of the ratchet (3), and the traction force is applied to the coil spring (42). Acting on the upper end of the swing arm (4). As a result, the coil spring (42) is compressed, the swing arm (4) is rotated counterclockwise, and the brake shoe (41) is pressed against the governor rope wound around the sheave (2). become.
Thereafter, when the rotational drive of the ratchet (3) is stopped, the coil spring (42) is elastically restored and the braking by the braking shoe (41) is released.
Thus, the ratchet (3), the swing arm (4), and the brake shoe (41) constitute a braking mechanism for braking the governor rope.

As shown in FIG. 4, on the side surface of the sheave (2), a trip lever (6) and a claw member (5) to constitute a trip mechanism are respectively pivoted (60) parallel to the rotation axis of the sheave (2). It is supported so as to be rotatable about (50).
The trip lever (6) has a locking portion (62) at one end and a cam follower (61) at the other end with the pivot (60) as the center. The claw member (5) has a locking receiving part (51) to be locked by the locking part (62) of the trip lever (6) at one end with the pivot (50) as the center. The other end portion has a claw portion (52) to be engaged with the teeth (31) of the ratchet (3).

The trip lever (6) is urged to rotate clockwise by a torsion spring (63), and the claw member (5) is urged to rotate counterclockwise by a coil spring (53).
In the normal operation state of the speed governor (1), the locking portion (62) of the trip lever (6) locks the locking receiving portion (51) of the claw member (5) as shown in FIG. The claw portion (52) of (5) is held in a state of being separated from the teeth (31) of the ratchet (3).
Accordingly, in this state, the ratchet (3) can rotate, and the braking by the above-described braking mechanism is released.

  A protrusion (64) is attached to the trip lever (6) in the vicinity of the locking portion (62), and the protrusion (64) is a free fly of one flyweight (21) shown in FIG. When the car speed exceeds the second threshold value in the process of rotating the flyweight (21) by the rotation of the sheave (2) as the car moves up and down, the flyweight is in contact with the end of the end side. (21) presses the protrusion (64), and the trip lever (6) can be rotated counterclockwise.

  As shown in FIG. 5, when the trip lever (6) rotates counterclockwise against the torsion spring (63), the locking portion (62) of the trip lever (6) locks the claw member (5). The claw member (5) is released from the receiving portion (51), and thereby the coil spring (53) is biased to rotate counterclockwise, and finally the claw portion of the claw member (5) as shown in FIG. (52) meshes with the teeth (31) of the ratchet (3).

In this state, when the sheave (2) continues to rotate downward in the car, the ratchet (3) is pressed by the claw member (5) by the rotation of the sheave (2) and is driven to rotate counterclockwise.
As a result, when the brake shoe (41) is pressed against the governor rope wrapped around the sheave (2) and brakes are applied to the governor rope, relative movement occurs between the governor rope and the cage. The emergency stop device is activated and the car is brought to an emergency stop.

3. Remote trip mechanism and trip operation As shown in FIG. 2, the frame (10) is provided with a trigger member (8) at a position along the outer periphery of the sheave (2). The end portion is pivotally supported by the pivot shaft (80) and can swing.
As shown in FIG. 3, a movable portion (82) is connected to the swinging end portion of the trigger member (8), and the trigger member is pulled by pulling the wire (13) by the remote control device (11) described above. It is possible to turn (8) counterclockwise against the bias of the coil spring (17).

As shown in FIG. 4, the trigger member (8) has a cam surface (81) slidably contacted with the cam follower (61) at a portion of the trip lever (6) facing the cam follower (61).
In the normal operation state of the governor (1), the trigger member (8) is held at the rotating end in the clockwise direction by the bias of the coil spring (17) shown in FIG. In addition, the cam surface (81) of the trigger member (8) is slightly separated from the cam follower (61) of the trip lever (6).

  At the time of maintenance inspection, if the governor (1) is tripped by operating the remote control device (11) from the landing side, the remote control device (11) is operated and the wire (13) is pulled while the car is descending. As shown in FIGS. 5 and 8, the trigger member (8) rotates counterclockwise, and the cam surface (81) of the trigger member (8) trips as the cage (2) moves downward. It is in sliding contact with the cam follower (61) of the lever (6).

  As a result, the trip lever (6) rotates counterclockwise against the bias of the torsion spring (63), and the locking portion (62) of the trip lever (6) locks the claw member (5). Detach from the receiving part (51). As a result, the claw member (5) is biased by the coil spring (53), and the claw portion (52) meshes with the teeth (31) of the ratchet (3) as shown in FIG.

In this state, when the sheave (2) further rotates counterclockwise as the car descends, this rotation is transmitted to the ratchet (3) via the claw member (5). The connecting lever (43) shown in FIG. 2 is pulled by the rotational torque of the ratchet (3), whereby the brake shoe (41) is pressed against the governor rope wound around the sheave (2). Is braked.
As a result, a relative movement occurs between the governor rope (93) and the emergency stop device (90) shown in FIG. 16, and this relative movement is transmitted to the emergency stop device (90) via the lever (94). The emergency stop device (90) is activated. As a result, the car (103) comes to an emergency stop.

4). 2. Automatic return mechanism and return operation As shown in FIG. 2, a disc having a plurality of (12 pieces) projecting pieces (33) formed on the side surface of the ratchet (3) at a constant angular pitch (30 degree intervals). 32) is fixed, and these projecting pieces (33) are arranged on a circumferential line centering on the rotating shaft (20) of the sheave (2).
Further, as shown in FIG. 4, a support base (74) is fixed to the claw member (5), and a pivot (70) parallel to the pivot (50) of the claw member (5) is mounted on the support base (74). A trip release lever (7) pivoted by is provided.

  The trip release lever (7) has a convex portion (71) protruding in a substantially triangular shape on the rotating shaft side of the sheave (2), and is allowed to rotate within a certain angle range around the pivot (70). At the same time, it is urged to rotate counterclockwise by a coil spring (75) stretched between the support base (74).

  As shown in FIGS. 14 and 15, the protrusion (71) of the trip release lever (7) has a protruding piece (33) along with the car ascending rotation of the sheave (2) at the advanced position of the trip release lever (7). ) And the second pressing surface (72) to which the projecting piece (33) should come into contact with the car descending rotation of the sheave (2) at the advance position of the trip release lever (7). A pressure receiving surface (73) is formed, and the second pressure receiving surface (73) has a smaller contact angle with the projecting piece (33) than the first pressure receiving surface (72).

  In the normal operation state of the speed governor (1) shown in FIG. 4, the trip release lever (7) is held at a position near the outer periphery (retracted position) of the sheave (2). As shown, the trip release lever (7) moves to the rotating shaft side of the sheave (2) with the counterclockwise rotation of the claw member (5) during the trip, and the trip shown in FIGS. In the state, it moves to the position (advance position) where the convex part (71) of the trip release lever (7) is advanced on the circumferential line where the plurality of projecting pieces (33) are arranged.

  When the speed governor (1) is automatically returned after maintenance and inspection of the speed governor (1), the car is slightly raised and the sheave (2) is slightly rotated as shown in FIGS. As the car rises, the braking state for the guide rail of the emergency stop device is released.

Further, the convex portion (71) of the trip release lever (7) comes into contact with one projecting piece (33) by the upward rotation of the sheave (2). At this time, the ratchet (3) is pressed by the claw portion (52) of the claw member (5) and the clockwise rotation is restricted, so that the projecting piece (33) is fixed at a fixed position. Accordingly, the trip release lever (7) is pressed clockwise on the first pressing receiving surface (72) of the convex portion (71) by the projecting piece (33), and rotates in the clockwise direction against the bias of the coil spring (75). Will do.
Even if the convex portion (71) of the trip release lever (7) collides with the projecting piece (33), the coil spring (75) urging the trip release lever (7) is elastically deformed to cause an impact. Power is eased.

  In the process of turning the trip release lever (7), as shown in FIG. 14, the pivot (70)-rotation from the pivot (70) of the trip release lever (7) to the contact point with the projecting piece (33). Since the distance A along the radial line between the shafts (20) gradually increases as the trip release lever (7) rotates (see FIGS. 11 to 12), the rotation of the sheave (2) (5) is also rotated clockwise about the pivot (50).

As a result, as shown in FIG. 13, the latch receiving portion (51) of the claw member (5) engages with the latch portion (62) of the trip lever (6), and the claw member (5) As shown in FIG. 4, the claw portion (52) is held in a posture where it is detached from the ratchet (3).
As shown in FIG. 13, in the state where the locking portion (62) of the trip lever (6) locks the locking receiving portion (51) of the claw member (5), the trip release lever (7) has a plurality of trip release levers (7). It retreats from the circumference line where the protruding pieces (33) are lined up.

  The trip release operation described above enables the ratchet (3) to rotate clockwise, thereby releasing the traction of the connecting lever (43) shown in FIG. 2 and winding the brake shoe (41) around the sheave (2). It will return to the non-braking state separated from the governor rope.

  4 to 6, the trip release lever (7) moves from the retracted position to the advanced position, and the projecting portion (71) of the trip release lever (7) has two projecting pieces as shown in FIG. Since it intervenes between (33) and (33), the second pressing receiving surface (73) of the trip release lever (7) comes into contact with the projecting piece (33) by the car descending rotation of the sheave (2). However, the contact angle C of the protrusion (33) with respect to the second pressure receiving surface (73) is smaller than the contact angle of the protrusion (33) with respect to the first pressure receiving surface (72), and the second pressure receiving surface (73). ) Acts on the inner side of the straight line connecting the contact point and the rotation center of the claw member (5), and is generated by the elasticity of the coil spring (75) that urges the trip release lever (7) to rotate. Is sufficiently smaller than the torque generated by the elasticity of the coil spring (53) that urges the claw member (5) to rotate, but the second pressure receiving surface (in the direction along the radial line passing through the rotating shaft (20)). 73) Since the contact area B with the projecting piece (33) is very narrow, the trip release lever (7) is only slightly rotated by a slight force due to the collision with the projecting piece (33). There is no problem with the car lowering rotation of 2), that is, tripping operation.

  As a result, the braking operation of transmitting the car descending rotation of the sheave (2) to the ratchet (3) and pulling the braking shoe (41) by the torque of the ratchet (3) to brake the governor rope is as follows: Runs normally.

  As described above, according to the elevator governor according to the present invention, the trip operation is easily performed by operating the remote control device (11) from the landing side without providing an inspection opening in the landing wall. This makes it possible for workers to perform inspection work safely.

  In addition, regardless of the rotational angle of the sheave (2) when the speed of the car exceeds the second threshold and the sheave (2) stops, a slight angle corresponding to the interval between the projecting pieces (33) By rotating the sheave (2) by a maximum of about 30 degrees in the embodiment, the governor (1) can be automatically returned. This improves the efficiency of return work.

  Each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, the number of the projecting pieces (33) is not limited to 12 and can be any number.

(1) Speed governor
(10) Frame
(11) Remote control device
(2) Sieve
(3) Ratchet
(33) Projection
(41) Brake shoe
(5) Claw member
(50) Axis
(51) Locking receiver
(52) Claw
(6) Trip lever
(60) Axis
(61) Cam Followers
(62) Locking part
(7) Trip release lever
(70) Axis
(71) Convex
(72) First pressure receiving surface
(73) Second pressure receiving surface
(8) Trigger member
(81) Cam surface

Claims (5)

In an elevator governor that is deployed at a certain height in the hoistway and activates an emergency stop device attached to the car when the car speed exceeds a predetermined threshold,
A sheave is rotatably supported by a frame provided at a certain height in the hoistway, and a braking mechanism is provided to brake a governor rope wound around the sheave. A flyweight mechanism that rotates by receiving centrifugal force according to the rotation of the sheave is provided, and a brake mechanism is provided between the flyweight mechanism and the brake mechanism when the amount of rotation of the flyweight mechanism exceeds a predetermined amount. A trip mechanism for shifting the non-operating state from the non-operating state to the operating state is interposed. The trip mechanism is connected to a remote control device via a wire, and operates the remote control device while the car is descending to control the governor rope. By generating a relative movement between the emergency stop device and the emergency stop device,
The braking mechanism is
A ratchet pivotally supported on the frame coaxially with the rotational axis of the sheave and having a plurality of teeth on the outer periphery;
A brake shoe coupled to the ratchet via a coupling lever and approaching and separating from the outer peripheral surface of the sheave as the ratchet rotates;
A claw member pivotally supported by the sheave, having a claw portion to be engaged with a ratchet tooth at one end, and a latch receiving portion at the other end;
First biasing means for biasing the claw member in the meshing direction with the ratchet;
It is pivotally supported by the sheave, and has a locking portion that engages with the locking receiving portion of the claw member and holds the claw portion of the claw member at a position separated from the ratchet at one end, and the other end A trip lever having a cam follower in the section;
Second biasing means for biasing the trip lever in the direction of engagement with the claw member;
A trigger member having a cam surface that is pivotally supported by the frame and slidably contactable with a cam follower of the trip lever; and the remote control device is connected to the trigger member via a wire, and the cam surface of the trigger member is connected to the trip lever. The elevator governor is characterized in that it is moved closer to and away from the cam follower. In an elevator governor that is deployed at a certain height in the hoistway and activates an emergency stop device attached to the car when the car speed exceeds a predetermined threshold,
A sheave is rotatably supported by a frame provided at a certain height in the hoistway, and a braking mechanism is provided to brake a governor rope wound around the sheave. A flyweight mechanism that rotates by receiving a centrifugal force according to the rotation of the sheave is provided, and a braking mechanism is provided between the flyweight mechanism and the braking mechanism when the amount of rotation of the flyweight mechanism exceeds a predetermined amount. With a trip mechanism to shift the non-operating state to the operating state,
At least one projecting piece is disposed on a circumferential line around the rotation axis of the sheave on the member that is restricted from rotating in the same direction as the car ascending rotation at least in the operating state of the braking mechanism, The trip mechanism is connected to a trip release lever, and the trip release lever is formed with a convex portion protruding toward the inside of the circumferential line. The trip release lever is configured so that the trip mechanism has a braking mechanism. In a state where it is not operated, the convex portion is held in a retracted position where the convex portion is retracted from the circumferential line, and in a state where the trip mechanism operates the braking mechanism, the convex portion is advanced onto the circumferential line. Set to advance position,
In the trip release lever, the convex portion is pressed by a single projecting piece as the sheave cage moves upward at the advanced position, and the trip mechanism is operated in the reverse direction by moving the trip release lever from the advanced position to the retracted position. An elevator governor that returns the braking mechanism from the operating state to the non-operating state. The braking mechanism is
A ratchet pivotally supported on the frame coaxially with the rotational axis of the sheave and having a plurality of teeth on the outer periphery;
A brake shoe coupled to the ratchet via a coupling lever and approaching and separating from the outer peripheral surface of the sheave as the ratchet rotates;
A claw member pivotally supported by the sheave, having a claw portion to be engaged with a ratchet tooth at one end, and a latch receiving portion at the other end;
First biasing means for biasing the claw member in the meshing direction with the ratchet;
A trip lever that is pivotally supported by the sheave and has a locking portion at one end that should be engaged with the locking receiving portion of the claw member to hold the claw portion of the claw member away from the ratchet;
A second urging means for urging the trip lever in the direction of engagement with the claw member, the trip release lever is connected to the claw member, and the one or more projecting pieces are members fixed to the ratchet The elevator governor according to claim 2 , which is provided in the elevator. The trip release lever is pivotally supported by a support base attached to the claw member so as to be able to rotate within a certain angular range, and the convex portion is formed by one projecting piece as the sheave raises the cage at the advanced position. The elevator governor according to claim 3 , wherein the governor is urged to rotate in a direction opposite to the direction of rotation when pressed. The convex portion of the trip release lever includes a first pressure receiving surface to which the projecting piece should come into contact with the sheave cage ascending and rotating at the advance position of the trip release lever, and a sheave at the advance position of the trip release lever. A second pressure receiving surface with which the projecting piece should come into contact with the car descending rotation is formed, and the second press receiving surface is set to have a smaller contact angle with the projecting piece than the first pressure receiving surface. The elevator governor according to claim 4 .

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