JPH1190854A - Fixture for drawout of pulley shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixture for drawing-out of a pulley shaft which can simply make the drewout operation of the pulley shaft from pulley body without emitting noise. SOLUTION: A fixture 4 for drawing out a shaft body 3 of a pulley 1 from the central part of the pulley body 2 is composed of a supporting plate 5 provided with a plurality of screw holes 5b capable of confronting the mounting threaded holes 3b in the condition that axis part 3a of the pulley shaft 3 is inserted through, a cylindrical body 6 which protrudes from the supporting plate 5 to one side about the plate thickness direction and whose forefront surface 6a can contact with the pulley body 2, and a plurality of bolts 7 which are inserted through the holes 5b and can be threadedly engaged with the mounting threaded holes 3b, whereby the bolts 7 are advanced in screwing into the mounting threaded holes 3b in the condition that the forefront surface 6a of the cylindrical body 6 is in contact with the pulley body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley for pulling a pulley shaft which is press-fitted into a central portion of a pulley body of a pulley such as a pulley for a chain of an elevator door machine.

[0002]

2. Description of the Related Art A pulley such as a pulley for a chain of an elevator door machine may have its shaft (pulley shaft) broken due to aged deterioration or the like. In such a case, the work of pulling out the pulley shaft that has been pressed into the center of the pulley body and replacing it with a new one must be performed.
For example, in the case of the chain pulley, the pulley main body has a diameter of about 400 mm and a thickness of only about 5 mm, and therefore, it is necessary to apply a local pulling force or the like to the pulley main body to extract the pulley shaft. Then, there is a possibility that the pulley body may be plastically deformed.

Therefore, conventionally, the head of the pulley shaft is hit with a hammer while the pulley body is placed and supported on a mounting table such as a cylindrical table provided with an escape hole for loosely inserting the pulley shaft. The pulley shaft had been removed from the pulley body.

[0004]

The prior art described above is
Since a noise is generated when the pulley shaft is hit with a hammer, there is a problem that in the case of an elevator door pulley or the like, people near the installation location of the elevator are greatly inconvenienced. In addition, in order to solve such a noise problem, in many cases, pulleys are actually pulled out to the rooftop of a building and then the pulley shaft is pulled out with a hammer. Since a long time is required, the operation time is undesirably prolonged, which is complicated and inefficient.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a pulley shaft unloading which can easily remove a pulley shaft from a pulley body without generating noise. Is to do.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a pulley shaft is press-fitted into a central portion of a pulley body, and mounting screw holes are provided at a plurality of positions of the pulley shaft. The pulley shaft used for pulling out the pulley shaft body from the pulley body of the engraved pulley is configured such that the mounting screw hole is inserted in a state where the shaft center of the pulley shaft body is inserted. A support plate provided with a plurality of screw insertion holes capable of facing the same, a tubular body projecting from the support plate to one side in the plate thickness direction, and a tip end surface capable of contacting the pulley body; A plurality of bolts that can be inserted and screwed into the mounting screw holes, wherein the bolts are screwed into the mounting screw holes in a state where the distal end surface of the tubular body is in contact with the pulley body. I tried to go.

[0007] The pulley shaft hiring thus constructed is
The support plate is externally inserted into the shaft center of the pulley shaft so that the tip end surface of the cylindrical body abuts on the pulley body, and the bolt inserted into the screw insertion hole is screwed into the mounting screw hole of the pulley shaft. By screwing in this bolt,
It is possible to move only the pulley shaft toward the support plate as the bolt is screwed while preventing the pulley body from moving at the tip end surface of the tubular body. Therefore, if the bolt is screwed into the mounting screw hole by a predetermined amount, the pulley shaft body press-fitted into the pulley body can be easily pulled out in the axial direction, and there is no fear of generating noise during the operation. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a cross-sectional view of a main part showing a state where a pulley shaft puller is mounted on a pulley according to an embodiment of the present invention, and FIG. 2 is a side view showing a state where the pulley shaft puller is mounted on a pulley as in FIG. FIGS. 3 and 3 are external perspective views showing a state in which the pulley shaft puller is mounted on the pulley as in FIGS. 1 and 2, and FIG. 4 is an external perspective view showing a state in which the pulley shaft puller is mounted on the pulley in the same embodiment. FIG. 5 and FIG. 5 are flowcharts showing work procedures in the embodiment.

1 to 4, reference numeral 1 generally indicates a chain pulley of an elevator door machine (not shown). This pulley 1 is a pulley body 2 made of a steel plate.
The head of the pulley shaft 3 is press-fitted into a fitting hole 2a formed in the center of the pulley shaft.
Extend along the rotation center line of the pulley body 2. In addition, mounting screw holes 3b are engraved at a plurality of positions of the pulley shaft body 3, and mounting holes 2b for communicating with the mounting screw holes 3b are formed at a plurality of positions of the pulley body 2. The pulley 1 is mounted at a predetermined position using the mounting screw holes 3b and the mounting holes 2b.

On the other hand, reference numeral 4 generally indicates a pulley shaft used for pulling out the pulley shaft 3 of the pulley 1 from the pulley body 2 in the axial direction. The pulley shaft removal 4 includes a disk-shaped support plate 5 having a center hole 5a through which the shaft center portion 3a of the pulley shaft body 3 is inserted, and a plurality of screw insertion holes 5b opposed to the mounting screw holes 3b. A cylindrical tubular body 6 protruding from one side of the support plate 5 on the side facing the pulley body 2 and inserted into each screw insertion hole 5b to be screwed into the mounting screw hole 3b of the pulley shaft 3. And the support plate 5 and the tubular body 6 are an integral product made of a steel material. That is, the pulley shaft puller 4 is configured such that the support plate 5 is externally inserted into the shaft center portion 3a of the pulley shaft body 3 with the cylindrical body 6 facing the pulley main body 2 side, and each screw insertion hole 5b is attached with a mounting screw. The pulley shaft 3 is moved toward the support plate 5 by screwing each bolt 7 into the mounting screw hole 3b while facing the hole 3b and keeping the tip end surface 6a of the cylindrical body 6 in contact with the pulley body 2. Then, it is pulled out from the pulley body 2.

In this embodiment, in order to correspond to the pulley 1 having a diameter of the pulley body 2 of about 400 mm and a maximum diameter of the pulley shaft body 3 of about 100 mm, the dimensions of each part constituting the pulley shaft pullout 4 are described. The outer diameter of the support plate 5 is about 123 mm, the inner diameter of the tubular body 6 is about 105 mm, the protrusion of the tubular body 6 from the support plate 5 is about 40 mm, the diameter of the center hole 5a is about 21 mm, and the screw is inserted. The diameter of the hole 5b is set to about 8.5 mm.

Next, the procedure of the pulling-out operation of the pulley shaft 3 performed by using the pulley shaft pull-out 4 will be described with reference to the flowchart of FIG. First, the support plate 5 is externally inserted into the shaft center portion 3a of the pulley shaft body 3, and the distal end surface 6a of the tubular body 6 is pulled out while the respective screw insertion holes 5b face the mounting screw holes 3b (see FIG. 4). It is brought into contact with the main body 2 (step S1). Then, the two bolts 7 inserted into the respective screw insertion holes 5b are screwed into the respective mounting screw holes 3b of the pulley shaft body 3, and the pulley shaft puller 4 is mounted on the pulley 1 (step S2). Then, while screwing the two bolts 7 evenly using a tool such as a wrench, the mounting screw holes 3b
, The pulley 1 tries to move toward the support plate 5, but since the movement of the pulley body 2 is blocked by the distal end surface 6 a of the cylindrical body 6, only the pulley shaft 3 is As the bolt 7 advances, the bolt 7 is gradually moved toward the support plate 5 (step S3). Therefore, each of the bolts 7 is further screwed in and screwed into the mounting screw hole 3b by a predetermined amount, so that the pulley shaft 3 press-fitted into the pulley body 2 is pressed.
Can be pulled out in the axial direction (step S4).

As described above, in the present embodiment, the pulley shaft 3 can be easily pulled out only by screwing in the two bolts 7 without hitting with a hammer or the like, so that there is no fear of generating noise during work. . Further, since no noise is generated during the work, the worker can perform the work of extracting the pulley shaft 3 at the place where the pulley 1 is removed. Therefore, compared with the conventional method in which the pulley 1 is carried out to the roof of a building and then the pulley shaft 3 is extracted, the working time of the present embodiment can be reduced to about one third. it can.

In the above-described embodiment, the support plate 5 and the tubular body 6 are manufactured in advance as an integrated product, but the steel plate-made tubular body is provided on one side of the steel plate support plate 5. 6
May be integrated by welding.

In the above-described embodiment, the mounting hole 2b
In order to correspond to the pulley 1 in which the screw holes 3b are provided at two positions, the screw insertion holes 5 are formed at two positions of the support plate 5.
b is provided and two bolts 7 are used, but in the case of using a pulley having three or more mounting holes 2b and three or more mounting screw holes 3b, the screw insertion hole 5 is used.
It is only necessary to provide three or more bolts and bolts 7 for pulley shaft pulling.

[0016]

The pulley shaft removal according to the present invention is carried out in the form described above, and has the following effects.

The support plate is inserted outside the shaft center of the pulley shaft so that the tip end surface of the cylindrical body abuts on the pulley body, and the bolt inserted into the screw insertion hole of the support plate is attached to the mounting screw of the pulley shaft. By screwing this bolt into the hole, the movement of the pulley body is prevented at the distal end surface of the tubular body by screwing in the bolt, and only the pulley shaft body is moved along with the screw advancement of the bolt on the support plate side. Can be moved to Therefore, if the bolt is screwed into the mounting screw hole of the pulley shaft by a predetermined amount, the pulley shaft that is press-fitted into the pulley body can be easily removed, and there is a fear that noise is generated during the work. Gone
Work time can also be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a state in which a pulley shaft puller is mounted on a pulley according to an embodiment of the present invention.

FIG. 2 is a side view showing a state where the pulley shaft puller is mounted on the pulley as in FIG.

FIG. 3 is an external perspective view showing a state where a pulley shaft puller is mounted on a pulley, similarly to FIGS.

FIG. 4 is an external perspective view showing a state in which the pulley shaft puller is being mounted on the pulley in the embodiment.

FIG. 5 is a flowchart showing a work procedure in the embodiment.

[Description of Signs] 1 Pulley 2 Pulley body 2a Fitting hole 3 Pulley shaft body 3a Shaft center part 3b Mounting screw hole 4 Pulley shaft removal 5 Support plate 5b Screw insertion hole 6 Cylindrical body 6a Tip surface 7 Bolt

Claims (3)

[Claims] A pulley shaft body is press-fitted into a central portion of a pulley body, and mounting screw holes are formed in a plurality of positions of the pulley shaft body. A pulley shaft withdrawal used to remove from the, a support plate provided with a plurality of screw insertion holes capable of facing the mounting screw hole in a state where the shaft center portion of the pulley shaft body is inserted,
A cylindrical body protruding from the support plate to one side in the plate thickness direction and having a tip end surface capable of abutting on the pulley body; and a plurality of bolts inserted into the screw insertion holes and screwable into the mounting screw holes. Wherein the bolt is screwed into the mounting screw hole with the tip end surface of the tubular body abutting on the pulley body. 2. The device according to claim 1, wherein the support plate has a disk shape, the tubular body has a cylindrical shape, and the tubular body is provided upright on one surface of the support plate. And pulley shaft exclusion. 3. The method according to claim 2, wherein the support plate is made of a steel plate and the tubular body is made of a steel pipe, and the support plate and the tubular body are integrated by welding. And pulley shaft exclusion.