JP2018118799A - Hydraulic elevator overhead dimension measuring tool and measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide overhead dimension measuring tools and methods that are capable of accurately and simply measuring actual overhead dimensions by one operator.SOLUTION: An overhead dimension measuring tool 30 is provided with: a tool base 40 that is installed at the upper position of a car 10; an advancing/retreating member 60 that can vertically move back and forth with respect to the tool base 40 in a state where the tool base 40 is installed at the upper position, and vertically extends; and a movement blocking/permitting mechanism 80 that blocks fluctuation of the position of the advancing/retreating member 60 relative to the tool base 40 when a force of a prescribed level or more for moving the advancing/retreating member 60 to the tool base 40 side is not applied to the upper end of the advancing/retreating member 60, and permits movement of the advancing/retreating member 60 to the tool base 40 side when the force of the prescribed level or more is applied to the upper end of the advancing/retreating member 60.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an overhead dimension measuring jig and measuring method for a hydraulic elevator.

  Conventionally, there is a hydraulic elevator described in Patent Document 1. This hydraulic elevator includes a hydraulic jack having a plunger that can move up and down, a hydraulic power unit that drives the hydraulic jack, a basket, and a suspension rope, and the suspension rope is suspended from a pulley provided at the upper end of the plunger. In addition, one end of the suspension rope is connected to a jack stand in the pit, and the other end is connected to a cage locking beam of the cage via a spring. The basket is suspended by a suspension rope and moves along the guide rail in the hoistway. The hydraulic jack has a cylinder, and the plunger is fitted to the cylinder so as to be able to advance and retract. The hydraulic power unit has a pump and an oil tank, and the oil tank communicates with the cylinder through a pipe. When the pump is driven, oil is sent from the oil tank to the cylinder, the plunger is raised, and the basket is raised. On the other hand, when the pump stops, the oil in the cylinder returns to the oil tank by its own weight, the plunger descends, and the cage descends.

JP-A-5-254759

  In hydraulic elevators, to ensure that the basket does not collide with the ceiling of the hoistway, the vertical distance (overhead) between the uppermost position of the cage and the ceiling of the hoistway when the plunger is raised to the highest position (push-up position) Dimensions) need to be measured.

  The overhead dimension is measured as follows, for example. First, the plunger is stopped below the push-up position. At that position, the vertical distance (first distance) between the uppermost position of the cage and the ceiling of the hoistway, the floor surface of the uppermost landing, and the bottom surface of the cage The vertical distance (second distance) is measured. Next, the plunger is raised to the push-up position, and the vertical distance (third distance) between the floor surface of the uppermost landing and the bottom surface of the cage is measured. Then, the overhead dimension is calculated by subtracting the difference between the third distance and the second distance from the first distance.

  In this overhead dimension measurement, the plunger must be stopped below the push-up position, and then the first distance and the second distance must be measured, which is a large-scale measurement requiring two workers. Become. Moreover, in order to calculate the overhead dimension, the first to third distances must be measured, and a plurality of measurements are required, which tends to increase measurement errors.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an overhead dimension measuring jig and method capable of measuring an overhead dimension accurately and easily by one worker.

  In the overhead dimension measuring jig according to the present invention, when the plunger in a hydraulic elevator that moves up and down the basket by moving the plunger fitted to the cylinder up and down by the pressure of oil supplied into the cylinder is positioned at the highest position. An overhead dimension measuring jig used to measure an overhead dimension defined by a distance between the uppermost position of the basket and the ceiling of the hoistway, and a jig base portion installed at an upper position of the basket And an advancing / retracting member that extends in the vertical direction with respect to the jig base portion and is movable in the vertical direction, and moves the advancing / retreating member toward the jig base portion on the upper end portion of the advancing / retreating member. When a force exceeding a predetermined direction does not act, the relative position of the advance / retreat member with respect to the jig base portion is prevented from changing, while the advance / retreat member of the advance / retreat member A movement prevention allowing mechanism that allows the advance / retreat member to move toward the jig base when the force more than the predetermined force is applied to the end, and when measuring the overhead dimension, The upper end portion is brought into contact with the ceiling by raising the plunger to the highest position in a state where the tool base portion is installed at the upper position, and at least a part of the advancing / retreating member is moved to the jig by a force from the ceiling. It is moved to the base side.

  The basket includes all parts that do not move relative to the floor surface of the basket, and includes, for example, a guide shoe attached to the main body of the basket.

  According to the present invention, the jig base portion is installed at an upper position of the cage, preferably at the uppermost position, the plunger is raised to the highest position, and then at least a part of the advance / retreat member is moved by the force from the ceiling. The overhead dimension can be measured simply by measuring the height of the overhead dimension measuring jig moved to the jig base part side. Therefore, the overhead dimension can be measured accurately and easily by one worker.

  Further, in the present invention, the jig base portion includes a flat plate portion having a flat installation surface, and the upper end portion is constituted by a flat plate portion having a flat contact surface to be brought into contact with the ceiling. The member may have a scale capable of determining the vertical dimension.

  According to the above configuration, since the jig base portion includes the flat plate portion having a flat installation surface, the jig can be stably installed when the upper position of the cage is a plane, and jig collapse can be suppressed. In addition, since the upper end portion is composed of a flat plate portion, the force received by the upper end portion when contacting the ceiling of the hoistway tends to be a uniform lower force, and the advancing and retreating member can be smoothly moved to the jig base portion side. Easy to move to. Further, since the advance / retreat member has a scale that can determine the vertical dimension, the height of the overhead dimension measuring jig can be easily and quickly determined, and the overhead dimension can be easily and quickly determined.

  In the present invention, at least a part of the jig base portion that contacts the upper position is formed of a permanent magnet, and the jig base portion accommodates a part of the advance / retreat member so as to freely advance and retract. The movement prevention allowing mechanism includes a wave-shaped engaging portion provided in the advance / retreat member, and a tip portion extending from the inner surface of the case to the concave portion of the wave-shaped engaging portion. The wavy engagement portion extends in the up-and-down direction, and the pin-shaped member has the wavy engagement portion when a force greater than the predetermined force is applied. It may be possible to get over the convex part of the vertical direction.

  According to the above configuration, since at least a part of the portion in contact with the upper position in the jig base portion is formed of a permanent magnet, the jig base portion is formed when the upper position is formed of a ferromagnetic material such as metal. Can be attached to the upper position by magnetic force. Therefore, it can suppress that a jig base part moves at the time of a measurement. In addition, since the movement prevention allowing mechanism includes a wave-shaped engaging portion extending in the vertical direction of the advance / retreat member and a pin-like member extending from the inner surface of the case, the movement prevention allowing mechanism can be configured simply and inexpensively.

  The overhead dimension measuring method of the present invention is an overhead dimension measuring method for measuring an overhead dimension using the overhead dimension measuring jig of the present invention, wherein the jig base portion is positioned above the cage of the hydraulic elevator. After the installation step and the installation step, the plunger of the hydraulic elevator is raised to the highest position, and at least a part of the advance / retreat member is moved to the jig base portion side by the force from the ceiling of the hoistway After the advancing / retracting member moving step and the advancing / retracting member moving step, the height of the overhead dimension measuring jig after the plunger is moved downward and at least a part of the advancing / retracting member moves to the jig base part side. An overhead dimension measuring step for measuring an overhead dimension based on the height.

  According to the present invention, an overhead dimension can be measured accurately and easily by a single worker by simply placing the overhead dimension measuring jig at a position above the cage and raising the plunger to the highest position.

  According to the overhead dimension measuring jig and method of the present invention, the overhead dimension can be measured accurately and easily by a single worker.

It is a schematic block diagram of the hydraulic elevator which can apply the overhead dimension measuring jig of this invention. It is a perspective view of the overhead dimension measuring jig concerning one embodiment of the present invention. It is a schematic cross section for demonstrating the measuring method of the overhead dimension using the said overhead dimension measuring jig.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments and modifications are included, it is assumed from the beginning that a new embodiment is constructed by appropriately combining these characteristic portions.

  FIG. 1 is a schematic configuration diagram of a hydraulic elevator 1 capable of measuring overhead dimensions with the overhead dimension measuring jig of the present invention. First, the configuration and operation of a hydraulic elevator will be briefly described with reference to FIG.

  As shown in FIG. 1, the hydraulic elevator 1 includes a hydraulic jack 3, a hydraulic power unit 6, a basket 10, and a suspension rope 7. The hydraulic jack 3 has a plunger 2 and a cylinder 15, and the plunger 2 is fitted to the cylinder 15 so as to be movable up and down. The hydraulic power unit 6 is installed in the machine room 5 and has a pump 18 and an oil tank 16. The oil tank 16 communicates with the cylinder 15 via the pipe 4. The suspension rope 7 is suspended from a pulley 8 provided at the upper end of the plunger 2. One end of the suspension rope 7 is connected to the jack base 13 in the pit, and the other end is connected to the tuna stop beam 19 of the cage 10 via a spring 14. The basket 10 is suspended from the suspension rope 7. A guide rail 9 extending in the vertical direction is installed in the hoistway 20, and a guide shoe 11 is attached to the cage 10. The guide shoe 11 slides on the guide rail 9.

  When the pump 18 is driven, oil is sent from the oil tank 16 to the cylinder 15, the plunger 2 is raised, and the basket 10 is raised along the guide rail 9 in the hoistway 20. On the other hand, when the pump 18 stops, the oil in the cylinder 15 returns to the oil tank 16 due to the weight of the cage 10, the plunger 2 descends, and the cage 10 descends along the guide rail 9 in the hoistway 20.

  In the hydraulic elevator 1, in order to confirm that the car 10 does not collide with the ceiling 21 of the hoistway 20, the uppermost position 25 of the car 10 and the hoistway 20 at the position where the plunger 2 is raised to the highest position (push-up position). It is necessary to measure an overhead dimension that is a vertical distance from the ceiling 21. Next, a jig for measuring the overhead dimension, a method of using the jig, and an operation effect will be described.

  FIG. 2 is a perspective view of an overhead dimension measuring jig 30 according to an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view during the use of the overhead dimension measuring jig 30.

  As shown in FIG. 2, the overhead dimension measuring jig (hereinafter, referred to as a jig) 30 includes a jig base portion 40 and an advance / retreat member 60. The jig base portion 40 includes a substantially rectangular parallelepiped case 41, and the bottom surface portion of the case 41 includes a flat plate portion 42 having a planar installation surface 52. The flat plate portion 42 includes a front side plate portion 43 and a back side plate portion 45, and the back side plate portion 45 is formed of a permanent magnet. For example, the back side plate part 45 is fixed to the front side plate part 43 with an adhesive.

  The advance / retreat member 60 extends in the normal direction of the flat plate portion 42. The normal direction of the flat plate portion 42 coincides with the height direction of the jig 30 and also coincides with the vertical direction when the flat plate portion 42 is installed on a horizontal plane. The top plate portion 46 of the case 41 is provided with a through hole 47 through which the advance / retreat member 60 passes. The advance / retreat member 60 passes through the through hole 47, and a part of the advance / retreat member 60 is accommodated in the case 41 so as to be freely advanced / retracted. The upper end portion of the advance / retreat member 60 is constituted by a flat plate portion 50 having a flat contact surface 48.

  With reference to FIG. 3A, the jig 30 further includes a movement prevention allowing mechanism 80. The movement prevention allowing mechanism 80 includes an engaging portion 81 and a pin-like member 82. The engaging portion 81 is provided on the lower side in the vertical direction of the advance / retreat member 60. The case housing portion 88 disposed in the case 41 in the advance / retreat member 60 includes a cylindrical shaft portion 84 having a plurality of annular grooves 85. The plurality of annular grooves 85 are provided at intervals in the vertical direction of the cylindrical shaft portion 84. The engaging portion 81 is formed on the outer peripheral surface of the cylindrical shaft portion 84. The engaging portion 81 is a wave extending in the vertical direction when the cylindrical shaft portion 84 is cut by a plane including the longitudinal direction A of the plate-shaped flat plate portion 42 having a rectangular front side surface and the central axis B of the cylindrical shaft portion 84. Consists of shape edges.

  The pin-shaped member 82 extends from the inner surface 55 of the case 41 to the concave portion 89 (the bottom portion of the annular groove 85) of the wave-shaped engaging portion 81, and the tip portion engages with the concave portion 89. The pin-shaped member 82 moves the convex portion (side wall of the annular groove 85) 95 of the wave-shaped engaging portion 81 in the vertical direction when a predetermined force in the vertical direction is applied to the upper end portion (flat plate portion 50) of the advance / retreat member 60. On the other hand, it is configured so that the convex portion 95 of the engaging portion 81 cannot be overcome when a predetermined force in the vertical direction is not applied. As a result, the movement preventing allowance mechanism 80 causes the jig base portion when the force exceeding the predetermined direction in the direction of moving the advance / retreat member 60 to the jig base portion 40 does not act on the upper end portion (flat plate portion 50) of the advance / retreat member 60. While the relative position of the advancing / retracting member 60 with respect to 40 is prevented from changing, the advancing / retreating member 60 is allowed to move relative to the jig base 40 when a force greater than the predetermined force is applied to the upper end of the advancing / retreating member 60.

  Continuing to refer to FIG. 3A, the advance / retreat member 60 includes a measurement unit 90 on the upper side of the cylindrical shaft portion 84. The measuring unit 90 has a columnar shape and extends in the vertical direction. The central axis of the measuring unit 90 and the central axis of the cylindrical shaft portion 84 are located on substantially the same straight line. The through hole 47 of the case 41 is a cylindrical hole, and the inner diameter of the through hole 47 is slightly larger than the outer diameter of the measuring unit 90, and the measuring unit 90 is fitted into the through hole 47 with a gap. As a result, the measuring unit 90 can move forward and backward in the vertical direction with respect to the through-hole 47, and the posture extending in the vertical direction is maintained by the cylindrical inner peripheral surface of the through-hole 47. The measurement unit 90 includes a scale 98. The scale 98 is attached at predetermined intervals in the vertical direction (the height direction of the measurement unit 90). The scale 98 represents the length in the vertical direction from the contact surface 48 with reference to the contact surface 48 of the flat plate portion 50. Further, the scale 98 is attached so that the value (reference value) of the contact surface 48 is the height of the jig base portion 40 indicated by a in FIG. As a result, the user can instantaneously determine the height of the jig 30 by reading the scale value on the top surface of the top plate portion 46 of the case 41.

  Next, how to use the jig 30 will be described with reference to FIGS. 1 and 3. When performing measurement, first, the measuring portion 90 is roughly projected from the case 41 by pulling the upper end portion (flat plate portion 50) of the advance / retreat member 60 so as to be longer than the length of the range assumed as the overhead dimension.

  Next, an installation process is performed. In the present embodiment, as shown in FIG. 3A, the jig base portion 40 is installed at the uppermost position 25 of the cage 10 of the hydraulic elevator 1. The uppermost position 25 of the cage 10 is often made of a ferromagnetic material such as an iron plate. The installation at the uppermost position 25 is performed by fixing the installation surface 52 of the back side plate portion 45 made of a permanent magnet to the uppermost position 25 of the car 10 by a magnetic force.

  Subsequently, an advance / retreat member moving step is executed. FIG. 3B is a schematic cross-sectional view showing the positional relationship between the jig 30, the ceiling 21 of the hoistway 20, and the uppermost position 25 of the cage 10 when the plunger 2 is raised to the highest position. In this advance / retreat member moving step, as shown in FIGS. 3A and 3B, the plunger 2 is raised to the highest position, and at least a part of the advance / retreat member 60 is cured by the force from the ceiling 21 of the hoistway 20. Move to the tool base 40 side.

  Thereafter, an overhead dimension measuring step is performed. This overhead dimension measuring step is performed by measuring the height b (see FIG. 3B) of the jig 30 after the advancing / retracting member moving step. The height of the jig 30 is measured instantaneously by reading the scale value c on the top surface of the top plate portion 46 of the case 41 (see FIG. 3B). In this embodiment, the jig base portion 40 is installed at the uppermost position 25 of the cage 10. Therefore, the height b of the jig 30 after the advancing / retreating member moving step matches the overhead dimension. Therefore, the overhead dimension can be determined instantaneously by reading the scale value c on the top surface of the top plate portion 46.

  According to the above embodiment, the jig base portion 40 is installed at the uppermost position 25 of the cage 10, the plunger 2 is raised to the highest position, and then the advancing / retreating member is driven by the force from the ceiling 21 of the hoistway 20. An overhead dimension can be measured only by measuring the height of the jig 30 in which a part of 60 is moved to the jig base 40 side. Therefore, the overhead dimension can be measured accurately and easily by one worker.

  Further, since the jig base portion 40 includes the flat plate portion 42 having the flat installation surface 52, the jig 30 can be stably installed when the uppermost position 25 of the cage 10 is flat, and the jig 30 falls down. Can also be prevented. Further, since the upper end portion of the advance / retreat member 60 is constituted by the flat plate portion 50, the force received by the upper end portion when contacting the ceiling 21 of the hoistway 20 tends to be a uniform lower force, and the advance / retreat member 60. Is easily moved to the jig base 40 side. Moreover, since the advance / retreat member 60 has the scale 98 which can judge the dimension of an up-down direction, an overhead dimension can be judged easily and rapidly.

  Furthermore, since the lower side of the jig base 40 is made of a permanent magnet, if the uppermost position 25 is made of a ferromagnetic material such as a metal as in the above embodiment, the jig base 40 is moved to the uppermost position. It can be attached to the upper position 25 by magnetic force. Therefore, it can suppress that the jig base part 40 moves at the time of a measurement. Further, since the movement prevention allowing mechanism 80 includes a wave-shaped engaging portion 81 extending in the vertical direction of the advance / retreat member 60 and a pin-like member 82 extending from the inner surface 55 of the case 41, the movement prevention allowing mechanism 80 is provided. Can be configured easily and inexpensively.

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

  For example, although the case where the outer surface shape of the case 41 is a substantially rectangular parallelepiped outer surface shape has been described in the above embodiment, the outer surface shape of the case may be a cylindrical shape, an outer surface shape of a prism other than a rectangular parallelepiped, or the like. The case may have any shape as long as it extends in the vertical direction with the jig base portion installed on a horizontal plane and has a chamber inside. Moreover, although the case where the plate-shaped permanent magnet was provided under the jig base part 40 was demonstrated, the permanent magnet should just comprise a part of installation surface of a jig base part, or a jig base part May not have a permanent magnet. Moreover, although the case where a part of the advance / retreat member 60 advances / retreats with respect to the case 41 of the jig base 40 has been described, the jig base may not have a case. For example, a guide portion (guide rail) that extends in the vertical direction with the jig base portion installed on a horizontal plane is provided in the jig base portion, and the advance / retreat member extends in the direction in which the guide portion extends relative to the guide portion. A structure capable of relative movement may be used.

  Moreover, although the case where the upper end side of the advance / retreat member 60 is configured by the flat plate portion 50 has been described, the flat plate portion may not exist on the upper end side of the advance / retreat member. Moreover, although the case where the scale 98 was attached to a part of the advance / retreat member 60 was described, the way of attaching the scale 98 may be different from the above-described embodiment. For example, the reference of the end face of the upper end portion of the advance / retreat member may be used. May be 0 (zero). Or the scale may not be attached to the advance / retreat member.

  Moreover, although the case where the movement prevention allowing mechanism 80 includes the cylindrical shaft portion 84 provided with the plurality of annular grooves 85 has been described, a plurality of linear shapes in which the movement prevention allowing mechanism is arranged at intervals in the vertical direction. A configuration including a rack having a plurality of grooves may be used. And the structure which makes the front-end | tip part of the pin-shaped member extended from the inner surface of a case engage with either of these groove | channels may be sufficient.

  Moreover, the case where the movement prevention allowing mechanism 80 includes the wavy engaging portion 81 extending in the vertical direction has been described. However, the movement prevention allowing mechanism may include, for example, a cylindrical hole provided in the jig base portion and extending in the height direction, and a columnar shaft portion of the advancing and retracting member press-fitted into the cylindrical hole. The movement prevention allowing mechanism may be a mechanism in which the columnar shaft portion moves in the vertical direction relative to the cylindrical hole only when a force larger than the static friction force is applied. Alternatively, the movement blocking allowance mechanism is the same mechanism as that adopted for calipers, and the advancement / retraction member is higher than the jig base portion only when a certain force is applied to the advancement / retraction member. It may be configured to move relative to the direction. Alternatively, the movement prevention allowance mechanism is the same mechanism as that adopted for the cutter knife, and the advancement / retraction member is higher than the jig base portion only when a certain force is applied to the advancement / retraction member. It may be configured to move in the vertical direction. The important point is that the relative position of the advancing / retreating member with respect to the jig base portion fluctuates when a force exceeding a predetermined amount in the direction of moving the advancing / retreating member toward the jig base portion does not act on the upper end portion of the advancing / retreating member. Any mechanism may be used as long as the mechanism allows the movement of the advance / retreat member to the jig base side when a force greater than the predetermined force is applied to the upper end of the advance / retreat member.

  Further, the case where the jig base portion 40 of the jig 30 is set at the uppermost position 25 of the basket 10 when measuring the overhead dimension has been described. However, it is preferable that the jig base portion of the jig is installed at the uppermost position of the cage, but it is only necessary to be installed above the cage, and it is not always necessary to install it at the uppermost position of the cage. For example, when there is no horizontal plane at the uppermost position of the cage, it may be installed on the highest horizontal plane (located at a position lower than the uppermost position) in the cage. The difference in height between the highest horizontal plane and the uppermost position of the cage is known. Therefore, even in this case, a single worker can accurately and easily measure the overhead dimension.

  DESCRIPTION OF SYMBOLS 1 Hydraulic elevator, 2 Plunger, 10 Basket, 15 Cylinder, 20 Hoistway, 21 Ceiling, Top position of 25 Basket, 30 Jig, 40 Jig base part, 41 Case, 42 Flat part of Jig base part, 45 Back side flat plate portion composed of permanent magnets, 48 contact surface, 50 flat plate portion of advance / retreat member, 52 installation surface, 55 inner surface of case, 60 advance / retreat member, 80 movement blocking allowance mechanism, 81 engagement portion, 82 pin-shaped member 89 concave parts, 95 convex parts, 98 scales.

Claims (4)

The uppermost position of the car and the hoistway of the hoistway when the plunger is located at the highest position in a hydraulic elevator that raises and lowers the basket by moving the plunger fitted to the cylinder up and down by the pressure of oil supplied into the cylinder. An overhead dimension measuring jig used to measure an overhead dimension defined by a distance from a ceiling,
A jig base installed at an upper position of the basket;
An advancing / retracting member that extends in the vertical direction with respect to the jig base portion and is movable in the vertical direction;
Prevents the relative position of the advancing / retreating member from fluctuating with respect to the jig base when no more than a predetermined force is applied to the upper end of the advancing / retreating member in the direction of moving the advance / retreat member toward the jig base. On the other hand, provided with a movement prevention allowing mechanism that allows the advancement / retraction member to move toward the jig base portion when a force greater than the predetermined force is applied to the upper end portion of the advancement / retraction member,
When measuring the overhead dimension, the upper end is brought into contact with the ceiling by raising the plunger to the highest position with the jig base portion installed at the upper position, and the force from the ceiling is used. An overhead dimension measuring jig in which at least a part of the advance / retreat member is moved to the jig base portion side. In the overhead dimension measuring jig according to claim 1,
The jig base portion includes a flat plate portion having a planar installation surface,
The upper end portion is composed of a flat plate portion having a flat contact surface to be brought into contact with the ceiling,
The advancing / retreating member is an overhead dimension measuring jig having a scale capable of determining the vertical dimension. In the overhead dimension measuring jig according to claim 1 or 2,
In the jig base portion, at least a part of the portion that contacts the upper position is composed of a permanent magnet,
The jig base portion includes a case that accommodates a part of the advance / retreat member so as to freely advance and retreat,
The movement prevention allowing mechanism extends from the inner surface of the case to the concave portion of the wave-shaped engaging portion, and the tip end portion engages with the concave portion. Including a pin-shaped member,
The wavy engagement portion extends in the up-down direction,
The said pin-shaped member is an overhead dimension measuring jig which can get over the convex part of the said wavy engagement part in the said up-down direction when the force more than the said predetermined acts. An overhead dimension measuring method for measuring an overhead dimension using the overhead dimension measuring jig according to claim 1,
An installation step of installing the jig base portion at a position above the cage of the hydraulic elevator;
After the installation step, the plunger of the hydraulic elevator is raised to the highest position, and the advancing / retreating member moving step of moving at least a part of the advancing / retreating member to the jig base portion side by the force from the ceiling of the hoistway;
After the advancing / retracting member moving step, the plunger is moved downward, and the overhead dimension is based on the height of the overhead dimension measuring jig after at least a part of the advancing / retreating member moves to the jig base part side. Measuring overhead dimensions, and
Including overhead dimension measuring method.

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