JP3328057B2 - Roller replacement tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for replacing a roller member made of a non-hard material, such as a urethane rubber tire of an elevator door lock switch roller, which is installed in a narrow space with a new material. The present invention relates to a roller exchange tool used.

[0002]

2. Description of the Related Art A door lock switch roller mounted on a landing door of an elevator has a structure in which a urethane rubber tire is fitted around a metal shaft. It needs to be replaced with a new one. Conventionally, during such replacement work, an operator removes the existing urethane rubber tire from the metal shaft while cutting the existing urethane rubber tire using a cutter knife or the like.

[0003]

However, as is well known, the door lock switch roller of an elevator is installed in a narrow space, and the urethane rubber tire is held rotatably. It is not easy to remove the existing urethane rubber tires using a knife, etc., so there is a problem that it takes a lot of time to remove the tires, and workers are easily injured during the removal work. There was a problem. In particular, in recent years, the number of sites where many urethane rubber tires of door lock switch rollers attached to the landing doors of each floor have to be replaced with the rise of buildings and the number of urethane rubber tires has rapidly increased. When an inefficient existing urethane rubber tire is removed by making full use of such a technique, a problem arises that a limited number of workers cannot complete the replacement work in one day.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the use of a non-rigid material that is installed in a narrow space, such as a urethane rubber tire of an elevator door lock switch roller. The present invention is to provide a roller replacement tool in which a new roller member can be safely and efficiently replaced with a new one.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roller changing tool used for replacing a roller member made of a non-hard material and externally fitted on a metal shaft with a new one. U in which a first wall having a hole and a second wall facing the first wall are raised substantially in parallel.
A U-shaped frame, a screw member which is screwed to the first wall of the U-shaped frame and whose distal end portion can advance and retreat with respect to the second wall, and the first and second frames An annular blade member having an annular blade for cutting the inner peripheral portion of the existing roller member inserted between the wall portions along the axial direction, and having an annular blade member attached to a distal end portion of the screw member. Achieved.

In order to efficiently attach a new roller member to the metal shaft after the existing roller member has been removed from the metal shaft, the present invention discloses a method in which the screw member has an open end exposed at the tip end thereof. Along with opening a pin mounting hole extending in the axial direction, using a guide pin that can be inserted into and removed from the pin mounting hole and has a tapered portion that diverges at one end, the guide pin on which a new roller member is ring-mounted, The annular blade member is removed and inserted into the pin mounting hole of the screw member.

[0007]

According to the above-mentioned solution, the roller changing tool is set so that the existing roller member is located between the second wall portion and the annular blade member, and then the screw member is screwed forward to form the annular member. When the blade member is advanced toward the second wall portion, the inner peripheral portion of the existing roller member can be cut annularly along the axial direction by the annular blade member. Then, if a thick portion outside the cut existing roller member is cut, the thick portion can be easily removed, and the thin portion of the existing roller member remaining around the metal shaft is removed. It can be easily removed because it is picked with pliers.

[0008] According to the latter solution described above,
After removing the existing roller member from the metal shaft, a new roller member is mounted around the guide pin, and one end of the taper portion side of the guide pin inserted into the pin mounting hole of the screw member is brought into contact with the metal shaft. When the screw member is screwed toward the second wall portion in a state where the guide member is gradually inserted into the pin mounting hole, the new roller member is pushed into the screw member, so that the guide pin is tapered. It moves to the metal shaft side through the section. Therefore, just by screwing the screw member by a predetermined amount,
The new roller member can be easily fitted on the metal shaft.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is an exploded perspective view of a roller exchange tool according to an embodiment, and FIG. 2 is a longitudinal sectional view showing a state in which an existing urethane rubber tire of an elevator door lock switch roller is removed by using the roller exchange tool. 3 is a perspective view of the removing operation step shown in FIG. 2, and FIG. 4 is a longitudinal sectional view showing a state where a new urethane rubber tire is mounted using the roller exchanging tool after removing the existing urethane rubber tire.

As shown in FIGS. 1 to 3, in this roller changing tool, a first wall 1a having a screw hole and a second wall 1b facing the wall 1a are erected substantially in parallel. A U-shaped frame 1 which has a U-shape and is rich in rigidity, and a tip portion of the U-shaped frame 1 which is screwed into the screw hole of the first wall portion 1a and whose tip portion is connected to the second wall portion 1b. On the other hand, a screw member 2 that can be advanced and retracted, an annular blade member 3 having an annular blade 3a and attached to a distal end of the screw member 2, and an open end exposed at the distal end of the screw member 2 in the axial direction And a guide pin 4 housed and held in a pin mounting hole 2b extending therethrough. An operation lever 2a is attached to the head of the screw member 2. In addition,
The annular blade member 3 is for cutting the inner peripheral portion of the existing urethane rubber tire 5 along the axial direction, and the inner diameter of the annular blade 3a is the maximum outer diameter of the metal shaft 6 on which the urethane rubber tire 5 is fitted. It is dimensioned to be slightly larger than this, and this annular blade member 3 can be removed from the tip of the screw member 2. A tapered portion 4a is formed at one end of the guide pin 4 so as to diverge. The maximum outer diameter of the tapered portion 4a is equal to or slightly larger than the maximum outer diameter of the metal shaft 6. Is set.

[0011] The roller exchange tool configured as described above is
It is used to remove the existing urethane rubber tire 5 of the door lock switch 7 of the elevator from the metal shaft 6. However, as will be described later, it is also possible to mount a new urethane rubber tire 10 (see FIG. 4) to the metal shaft 6. Available. In addition,
Reference numeral 8 in the figure denotes a switch lever of the door lock switch 7, and the urethane rubber tire 5 is externally fitted to a metal shaft 6 protruding from the switch lever 8. Reference numeral 9 in the drawing denotes a pin for pushing down the switch lever 8 when a landing door is opened and a hook (not shown) abuts.

Next, a procedure for removing the existing urethane rubber tire 5 from the metal shaft 6 using the above-described roller exchange tool will be described with reference to FIGS.

First, the existing urethane rubber tire 5 and the plate-like switch lever 8 fitted on the metal shaft 6 are positioned between the blade 3a of the annular blade member 3 and the second wall 1b. After setting the roller exchange tool, the annular blade member 3
By operating the operation lever 2a, the screw member 2 is screwed forward so as to advance toward the second wall 1b. Then, the annular blade 3a pushed into the screw member 2 is
Around the existing urethane rubber tire 5,
Since the inner peripheral portion of the urethane rubber tire 5 is cut annularly along the axial direction, the screw member 2 is screwed by a predetermined amount, and then the thick portion outside the cut existing urethane rubber tire 5 is cut with a cutter or the like. If a cut is made, the thick portion can be easily removed from the metal shaft 6. Thereafter, the thin portion of the existing urethane rubber tire 5 remaining around the metal shaft 6 is picked up with a plier or the like, stretched, and cut off with a cutter or the like, thereby completing the work of removing the existing urethane rubber tire 5.

That is, when the above-described roller exchange tool is used, the operation lever 2a of the screw member 2 is moved in a relatively easy space ahead of the narrow space where the urethane rubber tire 5 of the door lock switch 7 is installed. By rotating, the inner peripheral portion of the urethane rubber tire 5 can be cut in an annular shape, so that the existing urethane rubber tire 5 can be easily removed from the metal shaft 6 simply by using a cutter or the like as an auxiliary. Efficiently in a short time,
And it can be done safely.

[0015] Further, in this manner, the existing urethane rubber tire 5
Is removed from the metal shaft 6, after removing the annular blade member 3 from the screw member 2, the new urethane rubber tire 10 can be efficiently attached to the metal shaft 6 as shown in FIG.

That is, first, a new urethane rubber tire 10 is mounted around the guide pin 4 taken out of the pin mounting hole 2b of the screw member 2, and this guide pin 4 is inserted again into the pin mounting hole 2b. When the operation lever 2a is operated to screw the screw member 2 toward the second wall portion 1b in a state where the end surface of the guide pin 4 on the taper portion 4a side is in contact with the metal shaft 6, the guide Pin 4 gradually becomes pin mounting hole 2b
The new urethane rubber tire 10 is pushed into the screw member 2 and moves toward the metal shaft 6 via the tapered portion 4 a of the guide pin 4. Therefore, if the screw member 2 is advanced by a predetermined amount, the new urethane rubber tire 10 can be easily fitted onto the metal shaft 6.

As described above, according to the present embodiment, the removal of the existing urethane rubber tire 5 fitted on the metal shaft 6 of the door lock switch 7 and the new urethane rubber tire 10
Can be mounted on the metal shaft 6 efficiently and safely.
Even when a large number of urethane rubber tires for door lock switch rollers need to be replaced at a site with a large number of elevator floors, the replacement work can be reliably completed in a short time by a limited number of workers. No more worries about accidental injuries.

[0018]

As described above, the roller exchanging tool according to the present invention drives the annular blade member linearly by screwing the screw member. Like a urethane rubber tire of a door lock switch roller, an existing roller member, which is installed in a narrow space and is made of a non-hard material, can be cut in an annular shape along the periphery of its metal shaft. An excellent effect is obtained that the work of removing the roller member can be performed efficiently and safely in a short time only by using it supplementarily. Also, if a guide pin having a tapered portion can be inserted into the pin mounting hole formed in the screw member, a new roller member can be easily mounted on the metal shaft using this roller exchange tool. The properties are further improved. As a result, for example, when a large number of urethane rubber tires of the door lock switch roller have to be replaced at a site where the number of floors of the elevator is large, if the roller replacement tool is used, the replacement work can be reliably completed in a short time. Therefore, extremely high practical value can be expected.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a roller exchange tool according to an embodiment.

FIG. 2 is a longitudinal sectional view showing a state in which an existing urethane rubber tire of an elevator door lock switch roller is removed using the roller exchange tool.

FIG. 3 is a perspective view of a removing operation step shown in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a state in which a new urethane rubber tire is mounted using the roller exchange tool after removing an existing urethane rubber tire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 U-shaped frame 1a 1st wall part 1b 2nd wall part 2 Screw member 2a Operation lever 2b Pin mounting hole 3 Annular blade member 3a Annular blade 4 Guide pin 4a Taper part 5 Existing urethane rubber tire 6 Metal shaft 7 Door lock switch 10 New urethane rubber tire

Claims (2)

(57) [Claims] 1. A roller exchange tool used for exchanging a roller member made of a non-hard material and externally fitted on a metal shaft for a new one, comprising: a first wall portion having a screw hole; A U-shaped frame in which a second wall facing the wall of the U-shaped member is erected substantially in parallel with the second wall, and a distal end portion of the U-shaped frame is screwed to the first wall of the U-shaped frame to have a second end. A screw member capable of moving forward and backward with respect to the wall portion, and an annular blade for cutting the inner peripheral portion of the existing roller member inserted between the first and second wall portions along the axial direction. And an annular blade member attached to a tip end of the screw member. 2. The screw member according to claim 1, wherein the screw member is provided with a pin mounting hole extending in the axial direction by exposing an open end at a tip end thereof, and is capable of being inserted into and removed from the pin mounting hole. A guide pin having a divergent taper portion, and the guide pin on which a new roller member is mounted is inserted into the pin mounting hole of the screw member from which the annular blade member is removed. Roller replacement tool.