JPH0258579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a return testing device for an oil buffer disposed in an elevator pit.

[Background of the invention]

In elevators, when a car or counterweight falls to the bottom of the hoistway during an accident, in order to catch it and stop it safely with an appropriate deceleration, as shown in Utility Model Publication No. 49-20678, etc. An oil buffer is installed inside the pit.

3 and 4 are explanatory diagrams showing the oil buffer provided in this elevator. FIG. 3 is an explanatory diagram showing the arrangement state, and FIG. 4 is a longitudinal sectional view showing the structure.

In Fig. 3, 1 is a car, 2 is a guide rail that guides the car 1 in the vertical direction, 3 is a rail bracket that supports the guide rail 2 and is fixed to the road wall, and 5 is a rail bracket that supports the car 1. A counterweight (not shown) is attached to the other end of the rope 5 for lifting and lowering. Reference numeral 4 denotes an oil buffer, which is installed directly on the bottom surface of the pit 4a or on a molded steel base placed on the bottom surface. As shown in FIG. 4, the oil buffer 4 includes a cylinder 6 having oil inside, a plunger 7 fitted into the cylinder 6 so as to be slidable in the vertical direction, and a plunger 7 disposed inside the cylinder 6. a return spring 8 that urges the cylinder 6 to return;
An adjustment rod 10 is fixed to the bottom surface of the plunger 7, extends concentrically with the oil injection hole 9 provided in the center of the bottom surface of the plunger 7, and passes through the oil injection hole 9, and has an appropriate taper determined by the magnitude of the braking force. It is composed of etc.
Note that this is an air hole formed in the upper side wall of the plunger 7 shown in FIG. 4.

The oil buffer 4 configured as described above is
In an emergency, it operates as follows. That is, for example, when the car 1 falls and collides with the upper surface of the plunger 7 and pushes down the plunger 7, the oil in the cylinder 6 is squirted into the plunger 7 from the gap between the adjustment rod 10 and the oil injection hole 9. Due to the orifice effect at this time, the oil in the cylinder 6 becomes high pressure, and an upward braking force is applied to the plunger 7, thereby decelerating the car 1. Moreover, the air inside the plunger 7 compressed by the descent of the plunger 7 is blown out from the air hole I provided in the plunger 7, thereby preventing a dangerous increase in internal pressure. Further, the air hole A guides air into the plunger 7 when the plunger 7 is raised by the return spring 8, thereby making the return operation smooth.

By the way, if such oil buffer 4 does not operate normally, it will lead to a serious accident, so by law, this oil buffer 4 must be operated once a year.
It is mandatory to conduct a reinstatement test.

Conventionally, this return test was performed by a worker who entered the pit 4a and the car 1, respectively. Length 1.5~2m
The plunger 7 is lowered by the car 1 or a counterweight (not shown) through this block, and after descending by a predetermined stroke, the car 1 or the counterweight is moved upward, and the return spring 8 is lowered. The plunger 7 is raised by this force. If the plunger 7 returned to the predetermined return position within a predetermined time (usually 90 seconds), the test was deemed to have passed.

However, the conventional recovery test performed in this manner has the following drawbacks.

(1) Normally, the worker in the pit 4a instructs the worker in the car 1 to raise or lower the car 1 or the counterweight by saying, for example, "lower it a little more" or "raise it." However, since there is communication between the inside of the pit 4a and the inside of the car 1, this communication is difficult to establish, and therefore it takes a lot of time to conduct the test, and no improvement in test efficiency can be expected.

(2) Also, as shown in (1) above, inside the pit 4a,
When the workers in car 1 were calling out to each other, the worker in pit 4a called out to him, "Lift up!" If car 1 or the counterweight is lowered, there is a risk of serious accident.

(3) Also, since the test is conducted by simply placing a square piece of wood at a high position on the top surface of the plunger 7,
The support of the square timbers is likely to be unstable and therefore there is a danger associated with this timber square timber.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned actual situation in the prior art, and its purpose is to provide an oil buffer recovery test device that can be tested by a single operator without the intervention of a car or a counterweight. Our goal is to provide the following.

[Summary of the invention]

In order to achieve this object, the present invention has a plurality of latch fittings provided on the outer periphery of the cylinder constituting the oil buffer, one end of which is engaged with one of these latch fittings, and the latch fitting is hooked to the upper end of the plunger. The belt includes a belt whose other end is connected to a belt winding device, and a connecting body whose one end is connected to another of the hooks and whose other end is connected to the belt winding device.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil buffer recovery test device of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the overall configuration of an embodiment of the present invention, and FIG. 2 is a perspective view showing a head guide portion provided in the embodiment shown in FIG.

In Figure 1, 4 is an oil buffer, 6, 7
The cylinder and plunger, 4a and 4a, respectively, constitute the oil buffer 4, and the pit is as described above. Further, 20 is a latch that is wrapped around the lower end of the cylinder 6, and is fastened with a bolt 21.
A pair of hook portions 22a and 22b are provided on opposite sides of the hook. Reference numeral 11 denotes a belt, and one end thereof has a hook fitting 12 that engages with a hook portion 22a.
a, is placed on the upper surface of the plunger 7, is fitted into a head guide 17 (described later) that guides the belt 11, and has the other end fixed to a drum of a belt winding device 13 (described later).

As shown in FIG.
, hanging pieces 17b formed on both ends of the flat part 17a and capable of fitting into the head of the plunger 7, and rising pieces 17b formed on the sides of the flat part 17a to prevent the belt 11 from falling off the flat part 17a. It consists of piece 17c. Reference numeral 18 denotes a bracket disposed below the head guide 17, which is fixed to the head guide 17, for example, and includes a flat portion 18a having a longitudinal direction perpendicular to the longitudinal direction of the flat portion 17a of the head guide 17, and a flat portion 18a. A hanging piece 1 formed at both ends of the plunger 7 and capable of fitting into the head of the plunger 7.
8b.

The belt winding device 13 described above is, for example, a commercially available device (manufactured by NSK Ltd., etc.), and as shown in FIG. Ratchet 1
6b, and a stopper 1 which can be engaged with this ratchet 16b by the biasing force of a spring (not shown).
6a and this stopper 16a to ratchet 16b.
The lever 16 is movably supported toward and away from the drum and rotatable relative to the drum and the ratchet 16b, and is engageable with the ratchet 16b by the biasing force of a spring (not shown). The cam 1 provided on the lever 16 of
It is provided with a stopper 15a that can be engaged with the stopper 6c, and a bracket 15 that movably supports the stopper 15a.

Reference numeral 14 denotes a connecting body, such as a belt, which is attached to the bracket 15 at one end and has a hook 12b at the other end that engages with the hook 22b described above.

Next, a recovery test of the oil buffer 4 performed in the embodiment configured as described above will be explained.

First, as shown in FIG. 1, the bracket 18 and head guide 17 are placed on the top surface of the plunger 7, and the belt 11 is stretched around the head guide 17.
The hook 12a is engaged with the hook 22a, and the hook 12b of the other belt 14 is engaged with the hook 22a.
b. In this state, belt winding device 1
When the lever 16 of No. 3 is rotated upward in the direction of the arrow 30 in FIG.
The ratchet 16 rotates in the direction of arrow 30 in a.
b rotates in the direction of the arrow 30, the drum around which the belt 11 is wound rotates together with the ratchet 16b in the direction of the arrow 30, and the belt 11 is wound around the drum. When the lever 16 is rotated downward in the direction of the arrow 31, the end of the stopper 16a engages along the curved back of the teeth of the ratchet 16b, thereby causing the stopper 16a to engage with a spring (not shown). It moves in the direction of arrow 32 against the force, or moves in the opposite direction to the direction of arrow 32, while the stopper 15a remains engaged with the ratchet 16b, so the ratchet 16b, that is, the drum, does not rotate. Belt 11 is not rewound. Then, by repeating the above-described vertical rotation of the lever 16, the belt 11 is wound around the drum, and the plunger 7 is thereby gradually lowered.
Descends to the final lower end position.

When such a state occurs, the stopper 16a is moved in the direction of the arrow 32 by an appropriate means against the force of a spring (not shown), and the lever 16 is released from the engagement between the stopper 16a and the ratchet 16b.
When rotated upward in the direction of arrow 30, lever 1
The cam 16c of No. 6 engages with the stopper 15a, and the stopper 15a moves toward the arrow 3 against the force of a spring (not shown).
As a result, the engagement between the stopper 15a and the ratchet 16b is released, that is, the operating force applied to the plunger 7 is released, and the ratchet 16b, that is, the drum, becomes freely rotatable, and the aforementioned cylinder 6 The plunger 7 is raised by the force of a return spring (corresponding to spring 8 in FIG. 5) provided therein. If the moving time of the plunger 7 to the predetermined upper end position is within 90 seconds, the test is deemed to have passed and the test is completed. After the exam,
Belt winding test 13, remove all devices and instruments such as head guide 17 and bracket 18, belt 11, etc.

According to this first embodiment, the test can be carried out by only the worker in the pit 4a, and the test can be carried out by just one worker without the intervention of a car or counterweight, improving the test efficiency. Furthermore, since there is no intervening car or counterweight, and there is no need to arrange square timbers, the test can be carried out safely.

In addition, a head guide 17 is provided on the top surface of the plunger 7.
Since this is provided, the belt 11 can be smoothly transferred to the belt winding device 13 side, contributing to an improvement in test efficiency.

Further, since a bracket 18 is integrally provided at the lower part of the head guide 17, and four hanging pieces 17b and 18b that can be engaged with the head of the plunger 7 are provided on these head guides 17 and bracket 18, the head guide 17 and bracket 18
can be easily positioned on the plunger 7, and is reliably prevented from falling off the plunger 7, contributing to ensuring safety.

In addition, in the above embodiment, the belt winding device 13
Although the belt 14 has been described as a connecting body that connects the hook portion 22b and the hook portion 22b, the present invention is not limited to this, and the belt 14 may be replaced with a rope, a chain, or the like.

〔Effect of the invention〕

Since the oil buffer return test device of the present invention is configured as described above, the test can be performed by a single operator without the intervention of a car or a counterweight, and is more effective than conventional methods. It can improve efficiency and has an excellent effect on safety.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the overall configuration of an embodiment of the oil buffer return test device of the present invention, Fig. 2 is a perspective view showing a head guide portion provided in the embodiment shown in Fig. 1, and Figs. FIG. 4 is an explanatory view showing an oil buffer provided in an elevator, FIG. 3 is an explanatory view showing an arrangement state, and FIG. 4 is a longitudinal sectional view showing its structure. 4...Oil buffer, 6...Cylinder, 7...
...Plunger, 11...Belt, 12a, 12b
...Hook fitting, 13...Belt winding device, 14
... Belt (connection body), 17 ... Head guide,
17a...Plane part, 17b...Descent piece, 17c...
...Rising piece, 18... Bracket, 18a... Flat part, 18b... Hanging piece, 20... Latching fitting, 21
...Bolt, 22a, 22b...Hook part.

Claims (1)

[Claims] 1. A cylinder disposed in a pit and having oil inside, a plunger slidably fitted into the cylinder, and a return spring that urges the plunger to return. However, when the elevator car or counterweight collides with the top surface of the plunger, the oil in the cylinder moves toward the plunger, resulting in an orifice effect and a spring effect by the return spring. , in the oil buffer return test device for buffering and stopping the car or the counterweight, a plurality of latches are provided on the outer periphery of the cylinder, one end of which engages with one of the latches, and the upper end of the plunger. a belt that is hung over the belt and whose other end is connected to the belt winding device; and a connecting body whose one end is connected to another of the hanging fittings and whose other end is connected to the belt winding device. An oil buffer recovery test device characterized by: 2. The oil buffer return test device according to claim 1, further comprising a head guide for guiding the belt at the upper part of the plunger. 3. The head guide includes a flat part on which the belt comes into contact, a hanging piece provided at both ends of this flat part that can engage with the head of the plunger, and a hanging piece provided on the side of the flat part to prevent the belt from falling off. 3. The oil buffer recovery test device according to claim 2, further comprising a rising piece for a purpose. 4 The lower surface of the head guide is provided with a flat part disposed perpendicular to the longitudinal direction of the flat part of the head guide, and hanging pieces provided at both ends of this flat part and capable of engaging with the head of the plunger. 3. The oil buffer recovery test device according to claim 2, further comprising a bracket for controlling the oil buffer.