JPH11335019A - Terminal switch for elevator and inspection method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal switch for an elevator, which can be inspected without using a ladder. SOLUTION: An elevator terminal switch comprises a switch board 21 on which limit switches D2, D3 are vertically arranged and attached, and a pedestal 25 attached thereto with the switch board 21. In this arrangement, a protrusion 27 is provided to either one of the switch board 21 and the pedestal 25, a cutout 26 in which the protrusion 27 is loosely fitted and engaged is formed the other one of them, and in this engaged condition, the switch board 21 can be relatively displaced in an elevating direction. During inspection, the switch board 21 is pulled onto the car, and after the inspection, the switch board 21 is fixed for installation to the pedestal 25 a fixture 30 so as to disable the relative displacement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator end point switch.

[0002]

2. Description of the Related Art FIG. 8 shows a mounting position of an end point switch of an elevator. In FIG. 8, 1 is a hoistway, 1a is a pit, 2 is a car that moves up and down the hoistway 1, 2a is a car upper surface, 2D is a car door, 3 is a car frame supporting the car 2, 3
a is an upper frame, 4 is a main rope which is attached to the upper frame 3a via a cleat, and suspends the car 2, 5 is a rail for guiding the car 2, and 6 is a car on which the main rope 4 is wound. A hoisting machine that drives 2 up and down, 7 is a machine room, 8 is a machine base provided in the machine room 7 and on which the hoisting machine 6 is mounted, and 9 is a countermeasure (not shown) for the main measure. It is a deflecting car for hanging down. 10 is a shock absorber erected in the pit 1a, 10a is a shock absorber stand, 11 is a cam mounted on the car frame 3, 12
U is an upper end switch mounted in the hoistway 1 near the upper terminal floor with a plurality of limit switches operating in opposition to the cam 11 in a vertical direction. Limit climbing beyond. 12
D is a lower end switch which is similarly provided with a plurality of limit switches and mounted in a hoistway near the lower terminal floor. Reference numeral 13 denotes a mounting arm for mounting these end switches 12U and 12D to the rail 5.

FIGS. 9 to 11 show inspection of a conventional end point switch of an elevator. In FIG. 9, TF is the top floor, TFD is the landing door of the top floor TF, M is an inspector who goes up to the car upper surface 2a and checks the upper end switch 12U, U
Reference numeral 1 denotes a limit switch which operates first when facing the cam 11 when the car 2 approaches the top floor TF, U2 denotes a limit switch which operates secondly, and U3 denotes a limit switch which operates thirdly. The upper end point switch 12U is arranged and mounted in tandem. In FIG. 10, 1F is the lowest floor, 1FD is the landing door on the lowest floor 1F,
D1 is a limit switch that operates first in opposition to the cam 11 when the car 2 approaches the lowest floor 1F, D2 is a limit switch that operates second, and D3 is a limit switch that operates third. The lower end point switch 12D is arranged and mounted in tandem. In FIG. 11, 2F is the floor immediately above the lowest floor 1F, and LD is the pit 1a.
It is a ladder leaned inside.

[0004] The elevator is usually stopped at each floor by a landing device (not shown), but for some reason the deceleration of the elevator is not sufficient, and it is conceivable that the elevator may go too far. This overshoot must be prevented, especially at the terminal floor, where buildings are reserved.
The end point switch is provided for such a purpose,
As described above, a plurality of limit switches D installed in the hoistway 1 as the car approaches the terminal floor 1F or TF.
1, D2, D3 or U1, U2, U3 are sequentially operated to oppose the cam 11 to prevent the car 2 from going up and down beyond a predetermined range of the hoistway 1.

[0005]

By the way, when the car 2 stops on the lowest floor 1F, as shown in FIG.
It stops with a distance RB (hereinafter, also referred to as runby) between the lower surface of the car 2 and the shock absorber 10. But,
If the car 2 goes over the lowest floor 1F for some reason, the maximum distance that the car 2 can descend is this Lambay RB
And the distance TL obtained by adding the distance in which the shock absorber 10 is further depressed.
Becomes Even if the car 2 descends in this way, it is necessary for safety that at least the limit switch D3 continues to operate in opposition to the cam 11 to cut off the drive by the hoisting machine 6. The same applies to the upper end switch 12U.
Even if the car 2 has gone too far up the top floor TF, the limit switch U3 needs to continue operating opposite the cam 11. Accordingly, the effective length CL of the cam 11 is equal to the maximum distance TL at which the car 2 can go down past the lowest floor 1F.
It is necessary to adopt the longer one of the maximum distances at which the car 2 can go further past the top floor TF.
For this reason, especially in a high-speed elevator, the cam 11 becomes long and is usually attached to the side of the car 2. The end point switches 12U and 12D are necessarily installed at limited positions because they need to face the cam 11. When checking the end point switches 12U and 12D, the upper end point switch 12U is normally connected to the car upper surface 2a as shown in FIG.
, The lower end switch 12D is mounted on the hoistway 1 near the lower surface of the car 2. For this reason, even if the car 2 is lowered as shown in FIG. 10, it is separated from the car upper surface 2a by the distance RD from the car upper surface 2a to the top of the lower end switch 12D, and cannot be inspected from the car upper surface 2a.

Therefore, such a lower end point switch 12
In order to inspect D, first, after turning off the power of the elevator in advance, as shown in FIG.
A ladder LD was leaned against a and checked up. By the way, the inside of the hoistway 1 is in a bad environment with a lot of dust and high humidity. End point switch 1 installed in such a place
2U, 12D are limit switches D1, D2, D3, U
It is necessary to maintain functions such as cleaning of the components 1, U2, and U3, cleaning and refueling of the operating shaft portion, and inspection and maintenance of dirt and roughness of the switch contact portion. Performing such an operation on the ladder LD is unstable, because both hands are used for the operation, and there is a high risk of falling. Also, pit 1a
In general, the ladder LD cannot be installed at a position suitable for inspection of the end switch due to the installation status of the elevator equipment.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has as its object to enable inspection of a lower end switch without using a ladder. Further, since the end point switch is extremely important as a safety device for an elevator, it is also an object of the present invention to be able to confirm that the switch has been securely mounted. It is another object of the present invention to provide a method for checking an end point switch from a car.

[0008]

An end point switch of an elevator according to the present application comprises a switch base on which limit switches are arranged in a cascade and a base on which the switch base is mounted. One of the pedestals is provided with a protrusion, and the other is formed with a cutout portion into which the protrusion is loosely inserted and engaged, so that the switch base can be relatively moved in the ascending and descending direction in this engaged state. In addition, the switch base is fixed to the base in the engaged state so that the relative movement is disabled so that the switch base is mounted.

In order to engage the switch base with the base, a pin is implanted on one side and an elongated hole through which the pin is inserted is formed on the other side.

Further, the switch base and the pedestal are fitted at one end to define a relative position, and the switch base and the pedestal are fixed with the other end holding this fitted state. is there.

Still further, it is possible to detect that the switch base and the base are engaged in a fixable state.

Further, after the fixing of the end point switch is released from the car, the switch base is drawn and the inspection is performed on the car.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 to FIG.
1 shows an embodiment of the present invention, in particular, a lower end switch 1;
Details of 2D will be described. In the figure, reference numeral 21 denotes a switch base having a U-shaped cross section and having limit switches D1 (not shown), D2, and D3 arranged in tandem on the back surface. As shown in FIG. When the car 2 stops in the vicinity of the lowest floor 1F in the attached state, the car 2 has a sufficient length so that the inspector M can reach from the car upper surface 2a. Reference numeral 22 denotes a bottom plate for closing a U-shaped cross-section opening at one end of the switch base 21, reference numeral 23 denotes a hole formed in the bottom plate 22,
Reference numeral 24 denotes a fixing seat which is bent at a right angle from the tip of the top plate 24a for closing the U-shaped cross-section opening at the other end of the switch base 21 and partially covers the U-shaped opening, and has a screw hole for fixing the switch base 21. . 25 is composed of a long pillar having a U-shaped cross section.
The switch base 21 is limited to the limit switches D1, D2,
A pedestal D3 is set to the outside and the array is inserted in the ascending / descending direction and attached. 26 is a notch made of a long hole formed along the longitudinal direction on both sides of the pedestal 25. 27 is a notch The projection is formed by a pin that penetrates through the loose insertion and is implanted on the side surface of one end of the switch base 21, and a pan screw is used here. That is, the notch 26 and the protrusion 27
Constitutes an engaging portion for engaging the switch base 21 with the base 25. Reference numeral 28 denotes a positioning pin that is provided upright on a bottom plate 28a that closes a U-shaped cross section at one end of the pedestal 25. This defines the relative position with respect to. Reference numeral 29 denotes detection means attached to one end of the inside of the switch table 21. The detection means 29 is constituted by a limit switch which is activated when the positioning pin 28 is inserted into the hole 23. Reference numeral 30 denotes a fixing tool made of a bolt that is screwed with the fixing seat 24 to fix the switch base 21 to the base 25. Reference numeral 31 denotes a cable, which is connected to an electric wire 34 through connectors 32 and 33 inside the switch base 21 and restricted. Switches D1, D2, D3
It leads to.

The inspection of the lower end switch 12D attached to the hoistway 1 as described above will be described. Since the switch base 21 and the pedestal 25 have a sufficient length as described above, as shown in FIG. 5, from the car upper surface 2a to a position where the inspector M can reach the fixture 30 at the top of the lower end switch 12D. After lowering the car 2, the power supply of the elevator is cut off. The inspector M releases the fixing by the fixing tool 30, further removes the connector 32 and the connector 33, and then pulls up the switch stand 21. When the positioning pin 28 comes out of the hole 23 and the detecting means 29 is in an undetected state,
As shown in FIG. 4, the pin 1 rises with the pin 27 being guided by the elongated hole 26. In this embodiment, since the elongated hole 26 is formed over substantially the entire length of the pedestal 25, it can be raised by substantially the entire length of the pedestal 25, and as shown by broken lines in FIG. 5, the limit switches D1, D2, D3 Can be inspected from the car upper surface 2a. When the inspection is completed, the switch base 21 is lowered along the elongated hole 26, and the connector 32 and the connector 33 on the way.
And the positioning pin 28 is further lowered to fit the positioning pin 28 into the hole 23 and the detecting means 29 is operated. Then the upper fixing 3
Then, the switch base 21 is fixed to the base 25 again by tightening 0.

According to the first embodiment, since the switch base 21 can be lifted by releasing the fixing to the pedestal 25, the limit switch D1,
Inspection of D2 and D3 can be performed, and there is no need to go up to the ladder LD at the pit 1a for inspection, thereby improving the safety of the inspection work. Further, since one end of the switch base 21 is guided by the elongated hole 26, the positioning pin 28 and the hole 23 can be easily fitted. This fitting, together with the fixation by the fixture 30, makes it possible to securely fix the switch stand 21 at both ends. This certainty is extremely important for the mission of the end point switch as a safety device for the elevator. It is.
Further, since the engagement between the positioning pin 28 and the hole 23 is detected by the detecting means, the lower end point switch 12D
Can be more reliably mounted. Furthermore, the switch base 21 and the pedestal 25 are connected to the elongated hole 26 and the pin 27.
If the U-shaped bottom of the pedestal 25 is sufficiently deep, the switch base 21 can be turned over to the entrance / exit side in FIG. 5 while being engaged, and the inspection position can be diversified. I do.

The upper end switch 12U is
As described above, even the conventional one can be inspected from the car upper surface 2a, and from the viewpoint of inspecting without using a ladder, the invention of this application is of little significance, but the number of types of parts is reduced. , Lower end switch 12D
It is significant to adopt a configuration similar to that described above. FIG. 6 shows an embodiment in which the present invention is applied to the upper end point switch 12U. That is, as is clear from FIG. 6, the switch stand 21 and the pedestal 25 of the lower end point switch 12D shown in FIG. Therefore, since the switch stand 21 is pulled down, the car 2 can be stopped before the top floor TF for inspection. Further, the inspection can be performed not only from the outside of the switch stand 21 but also from the inside of the U-shaped groove. In addition, if it is not necessary to lower the switch stand 21, a check form similar to the related art may be used. Therefore, when the switch is used for the upper end switch 12U, components such as the switch stand 21 and the pedestal 25 can be shared, and
Inspection methods can be diversified.

Embodiment 2 FIG. In the first embodiment, the elongated hole 26, which is a cutout, is formed over substantially the entire length of the pedestal 25, but is not necessarily required over the entire length. That is, in FIG. 7, reference numeral 35 denotes a pedestal 35 in which a limited range of one end is cut out to form a cutout portion 36. According to this embodiment, the switch base 21 is completely separated from the pedestal 35 when the fixing by the fixture 30 is released and the connection of the connectors 32 and 33 is further released. Therefore, the inspection can be performed at any place, not limited to the car upper surface 2a, and the switch base 21 can be easily replaced.

Embodiment 3 In each of the above embodiments, the pin 27 is implanted in the switch base 21. However, the pin 27 may be implanted in the base, and the cutout may be formed on the switch base. is there. Also,
Although the switch base 21 is immersed in the pedestals 25 and 35, the pedestal may be immersed in the switch base.

[0019]

The end point switch of the elevator according to the present invention has a switch base on which limit switches are arranged in a tandem arrangement, and a projection on one of the pedestals on which the switch base is mounted, and the projection on the other. A cutout portion is formed in which the portion is loosely inserted and engages in a relatively movable state, and the switch base and the base are fixed in this engaged state. For this reason, the switch stand can be moved from the pedestal by releasing the fixing, and the end point switch can be inspected in a place where inspection is easy, so that there is an effect that work safety is improved.

A pin is implanted in one of the switch base and the pedestal, and an elongated hole through which the pin is inserted is formed and engaged with the other, so that the switch base can be held while maintaining the engaged state. Since it moves, there is an effect that the switch stand is not accidentally dropped during the inspection.

Furthermore, by fitting the switch base and the base at one end to define the relative position, it is easy to mount the switch base to the base after inspection.

Further, by providing a detecting means for detecting that the switch base and the base are engaged in a fixable state, the switch base can be securely mounted.

Further, according to the method in which the elevator car is stopped near the lowest floor, the switch stand is pulled up, and the lower end point switch is inspected, so that the inspection work can be performed on the upper surface of the car. .

[Brief description of the drawings]

FIG. 1 is a side view of an end point switch of an elevator according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view of an end point switch of the elevator according to the first embodiment of the present invention.

FIG. 4 is a side view showing details of the end point switch of the elevator shown in the first embodiment of the present invention.

FIG. 5 is a conceptual diagram showing an inspection operation of an end point switch of the elevator according to the first embodiment of the present invention.

FIG. 6 is a side view of the upper end point switch according to the first embodiment of the present invention.

FIG. 7 is a side view of the lower end point switch according to the second embodiment of the present invention;

FIG. 8 is an overall view of an elevator using a conventional end point switch.

FIG. 9 is a conceptual diagram showing a conventional method of checking an upper end point switch.

FIG. 10 is an explanatory conceptual diagram showing a conventional inspection method for a lower end switch.

FIG. 11 is an explanatory conceptual diagram showing a conventional inspection method of a lower end point switch.

[Explanation of symbols]

1 hoistway, 1a pit, 1F lowest floor, 2 cars,
2a car top, 11 cams, 12D lower end switch,
12U upper end switch, 13 mounting arm, 21 switch base, 22 bottom plate, 23 holes, 24 fixing seat, 25
Pedestal, 26 notch, 27 protrusion, 28 positioning pin,
28a bottom plate, 29 detection means, 30 fixture, 31
Cable, 32 connectors, 33 connectors, 34 wires, D1 limit switch, D2 limit switch, D3
Limit switch, LD ladder, M inspector, TF top floor, U1 limit switch, U2 limit switch, U3 limit switch.

Claims (5)

[Claims] An end point switch for preventing a car from going up and down beyond a predetermined range of the hoistway by sequentially operating a plurality of limit switches installed in the hoistway as the elevator car approaches the terminal floor. , A switch base on which the limit switches are arranged and mounted in tandem, a pedestal on which the switch base is mounted with the limit switch array oriented in a vertical direction, and a projection on one of the switch base and the pedestal A notch portion into which the protrusion is loosely inserted is formed on the other side, and an engaging portion for engaging the switch base so as to be relatively movable in the elevating direction, and the engaging portion is engaged with the engaging portion. An end point switch for an elevator, comprising: a fixing device for fixing the switch base to the base in such a state that the relative movement is disabled. 2. The switch device according to claim 1, wherein the protrusion is a pin implanted in one of the switch base and the pedestal, and the cutout is cut out in the other of the switch base and the pedestal in a vertical direction. The end point switch of the elevator according to claim 1, wherein the end point switch is a long hole into which the idle end is inserted. 3. A positioning pin is implanted at one end in the arrangement direction of the limit switch for one of the switch base and the pedestal, and a hole is formed at the other end facing portion to fit the positioning pin. The relative position between the switch base and the base is fixed, and the switch base and the base are fixed by a fixture at the other end in the arrangement direction of the limit switch in a state where the positioning pins and the holes are fitted. The end point switch of the elevator according to claim 1 or 2, wherein: 4. The elevator end point switch according to claim 1, further comprising detection means that is activated when the switch base and the base are engaged in a state that can be fixed by a fixture. 5. The switch base and the pedestal are engaged via a projection and a notch into which the projection is loosely inserted, and in this engaged state, the switch base and the pedestal are fixed by a fixture. In the inspection of the end point switch attached near the terminal floor of the hoistway, after releasing the fixation by the fixing tool from the car, move the switch base in the up and down direction and pull it onto the car to check the limit switch To check the elevator end point switch.