Brake pad insertion / removal aid for hoisting machine brake device and brake pad insertion / removal method

Abstract

This brake pad insertion / removal aid comprises: a body part in which a first planar part and a second planar part are connected so as to form an L shape in a cross-section orthogonal to the lengthwise direction; two long screws for extraction which screw together with respective screw hole parts; and two nuts for extraction which respectively screw together with the two long screws. The first planar part has two through holes which are formed to have a greater diameter than the outer diameter of the long screws for extraction. In an operation to extract a pair of brake pads, one end of each of the two long screws for extraction screws together with a respective screw hole part of one of the pair of brake pads in a state where the long screws for extraction respectively pass through the two through holes. The two nuts for extraction screw between the body part and respective other ends of the two long screws for extraction.

Description

[Technical Field]

[0001] The present disclosure relates to a technique for extracting or inserting brake pads of a brake device mounted on an elevator hoisting machine. [Background technology]

[0002] Patent Document 1 discloses a jig that enables the insertion and removal of brake pads. This jig includes a main body made of a flanged channel cross-section member, a long screw, and a nut. The tip of the long screw is connected to the brake pad. The flange of the main body is placed against the outer surface of the casing, and the nut threaded onto the long screw is rotated to pull the brake pad out from inside the brake device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-168866 Summary of the Invention [Problem to be solved by the invention]

[0004] The jig in Patent Document 1 requires the operator to sequentially remove a pair of brake pads inserted into the brake device one by one. Such repeated removal work may be a burden for the operator.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a brake pad insertion / removal aid and a brake pad insertion / removal method that assist in the work of pulling out or inserting brake pads of a brake device mounted on a hoist. [Means for solving the problem]

[0006] The present disclosure applies to a brake pad insertion / removal aid used when removing a pair of brake pads installed in an internal space of an elevator hoisting machine brake device from an opening communicating with the internal space. The pair of brake pads each have a screw hole portion on the front surface facing the opening. The brake pad insertion / removal aid comprises a main body portion in which a first flat portion and a second flat portion are connected so as to form an L-shape in a cross section perpendicular to the longitudinal direction, two long extraction screws that are threaded into each of the screw hole portions, and two extraction nuts that are threaded into each of the two long screws. The first flat portion is Along the longitudinal direction The brake pad removal tool has two through holes formed with a diameter larger than the outer diameter of the extraction screws. The main body is configured so that the overall length of the first flat portion in the short direction is smaller than the vertical opening width of the opening. In the operation of removing a pair of brake pads, each of the two extraction screws is configured so that one end of each screw is threaded into a corresponding threaded hole when the extraction screws are inserted through each of the two through holes, and two extraction nuts are configured so that each screw is threaded between the other end of each of the two extraction screws and the main body.

[0007] The present disclosure also applies to a brake pad insertion / extraction method for using the above-mentioned brake pad insertion / extraction aid to extract a pair of brake pads installed in an interior space of a brake device of an elevator hoisting machine from an opening communicating with the interior space of the brake device. The brake pad insertion / extraction method includes a step of threading two extraction nuts onto two long extraction screws, respectively, a first installation step of placing the main body on the outer surface of the opening, passing one end of each of the two long extraction screws through each of the two through holes, and threading one end of each of the two long extraction screws into each of the threaded hole portions, and a step of tightening the two extraction nuts.

[0008] Furthermore, in the brake pad insertion / extraction aid described above, the second flat surface portion has a pair of screw insertion holes arranged side by side in the longitudinal direction. The brake pad insertion / extraction aid has a pair of long insertion screws having heads at one end and threaded into the screw insertion holes at the other end. During the brake pad insertion operation, the main body portion is positioned in the internal space so that the second flat surface portion contacts the inner surface of the opening and the other ends of the pair of long insertion screws threaded into the screw insertion holes contact a front surface of the brake pad. A brake pad insertion / extraction method using the brake pad insertion / extraction aid to insert brake pads into an installation position through an opening communicating with the internal space of the brake device of an elevator hoisting machine includes the steps of: positioning the brake pad in the internal space at a position forward in the insertion direction from the installation position; a second installation step of positioning the main body portion in the internal space so that the second flat surface portion contacts the inner surface of the opening and the other ends of the pair of long insertion screws threaded into the screw insertion holes contact a front surface of the brake pad; and a step of tightening the pair of long insertion screws. [Effects of the Invention]

[0009] The brake pad insertion / removal aid disclosed herein allows a pair of left and right brake pads to be removed at once with little force, thereby reducing the burden on the worker. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing the external configuration of a brake device to which an insertion / extraction assisting tool according to an embodiment is applied; [Figure 2] FIG. 2 is a view of the brake device as seen from the front side of the opening. [Figure 3] 10A and 10B are diagrams for explaining the component configuration of a brake pad insertion / removal auxiliary tool. [Figure 4] 10 is a perspective view of the main body of the insertion / extraction assisting tool as seen from the back side of the first flat surface portion. FIG. [Figure 5] 10 is a perspective view of the main body of the insertion / extraction assisting tool as viewed from the front side of the second flat portion. FIG. [Figure 6]10A and 10B are diagrams for explaining the process of attaching a brake pad insertion / removal aid in the removal work. [Figure 7] 10A and 10B are diagrams for explaining the process of attaching a brake pad insertion / removal aid in the removal work. [Figure 8] 10 is a schematic diagram of the brake pad insertion / removal aid attached in the attachment process, seen from above with the case body cut along a horizontal plane. FIG. [Figure 9] 10A and 10B are diagrams for explaining the brake pad pulling-out process in the pulling-out operation. [Figure 10] 10A and 10B are diagrams for explaining the process of attaching a brake pad insertion / removal aid in the brake pad insertion work. [Figure 11] 10 is a schematic diagram of the brake pad insertion / removal aid attached in the attachment process, viewed from the left side with the case body cut along a vertical plane parallel to the insertion direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0012] Embodiment 1. Brake system external appearance FIG. 1 is a perspective view showing the external configuration of a brake device to which an insertion / extraction assisting tool according to an embodiment of the present invention is applied. The brake device 10 shown in this figure is a disc brake device mounted on an elevator hoist. The brake device 10 includes a case body 12 and a brake disc 14. An internal space 16 is formed in the case body 12. The internal space 16 communicates with the external space through a rectangular opening 18.

[0013] Figure 2 is a view of the brake device as seen from the front side of the opening. A pair of brake pads 20, 22 are inserted into the internal space 16 of the brake device 10 on both the left and right sides of the brake disc 14. In addition to the pair of brake pads 20, 22, several other components are attached to the internal space 16 of the brake device 10, but are not shown in Figure 2.

[0014] The pair of brake pads 20, 22 are configured to be insertable and removable through the opening 18. In the following description, the direction in which the pair of brake pads 20, 22 are removed from the brake device 10 is referred to as the "removal direction," and the direction opposite to the removal direction is referred to as the "insertion direction." Furthermore, the up-down and left-right directions when viewing the opening 18 of the brake device 10 from the front, as shown in Figure 2, are defined as the up-down and left-right directions of the brake device 10. Front portions 20a, 22a of the brake pads 20, 22 facing the opening are provided with threaded holes 201, 221 for removal, respectively. The thread diameter of the threaded holes 201, 221 is, for example, M8.

[0015] 2. Configuration of the brake pad insertion / removal aid for the elevator hoisting machine according to the embodiment The brake device 10 of the elevator hoist is periodically inspected by an operator. Replacement parts during inspection may include, for example, a pair of brake pads 20, 22. Replacing the pair of brake pads 20, 22 typically involves threading bolts into the screw holes 201, 221 and pulling out the brake pads together with the bolts. However, the task of pulling out the tightly fitted brake pads 20, 22 can be difficult and may be a heavy task for the operator.

[0016] The brake pad insertion / extraction aid of this embodiment is a tool used during maintenance work on such a brake device 10 to assist in the work of extracting a pair of brake pads 20, 22. Figure 3 is a diagram illustrating the component configuration of the brake pad insertion / extraction aid. The insertion / extraction aid includes a main body 30, two long extraction screws 32, two extraction nuts 34, two flat washers 36, two long insertion screws 38, and four nuts 40.

[0017] The main body 30 is an angle bar with an L-shaped cross section, in which a first flat surface 301 and a second flat surface 302 are connected so as to form an L-shape in a cross section perpendicular to the longitudinal direction. In the following description, the surface on which the planar angle between the first flat surface 301 and the second flat surface 302 is 90 degrees is defined as the back surface, and the surface on which the planar angle is 270 degrees is defined as the front surface.

[0018] Two through holes 303 are formed in the first flat portion 301 along the longitudinal direction. FIG. 4 is a perspective view of the main body of the insertion / extraction assisting tool as viewed from the back side of the first flat portion. The pitch between the two through holes 303 is the same as the pitch between the screw holes 201, 221 of the pair of brake pads 20, 22 attached to the brake device 10. For example, the two through holes 303 are formed at positions 30 mm apart from the center of the first flat portion 301 in the longitudinal direction toward each end. The diameters of the two through holes 303 are larger than the outer diameter of the extraction screw 32. For example, if the thread diameter of the extraction screw 32 is M8, the diameter φ of the two through holes 303 is 10 mm to 12 mm.

[0019] A guide label portion 309 is attached to the back surface of the first flat surface portion 301 to guide the user when removing the brake pads 20, 22. The guide label portion 309 here has the words "pad removal side" and an arrow mark indicating the direction from the base end to the tip end in the short direction of the first flat surface portion 301. There are no limitations on the shape, number, or arrangement of the guide label portions 309. For example, the guide label portion 309 may be configured as a single label. Chamfered portions 310 are formed at each of the corners at both ends in the longitudinal direction of the first flat surface portion 301. There are no limitations on the shape or size of the chamfered portions 310.

[0020] The second flat surface portion 302 is formed with a positioning through hole 304 and two insertion screw holes 305. FIG. 5 is a perspective view of the main body of the insertion / removal assisting tool as seen from the front side of the second flat surface portion. The positioning through hole 304 is formed in the longitudinal center of the second flat surface portion 302. The diameter of the positioning through hole 304 is larger than the outer diameter of the extraction screw 32. For example, if the thread diameter of the extraction screw 32 is M8, the diameter φ of the positioning through hole 304 is set to 10 mm. Note that the positioning through hole 304 is not an essential component.

[0021] The two screw insertion holes 305 are formed on both sides of the positioning through hole 304 in the longitudinal direction. The two screw insertion holes 305 are formed, for example, by forming through holes in the second flat surface portion 302 and welding nuts to the positions of the through holes from the front side. The thread diameter of the screw insertion holes 305 is a thread diameter that can be threaded with the long insertion screws 38. For example, if the long insertion screws 38 are M10 threads, the thread diameter of the long insertion screws 38 is M10. The pitch between the two screw insertion holes 305 is set to a width that is smaller than the vertical width dimension of the brake pad 20 attached to the brake device 10. For example, the two screw insertion holes 305 are formed at positions 40 mm apart from the center toward each end in the longitudinal direction.

[0022] Guide labels 306, 308 are attached to the surface of the second flat portion 302 to guide the insertion of the brake pads 20, 22. The guide label 306 is attached to a position above the upper insertion screw hole 305 when the second flat portion 302 is oriented with the first flat portion 301 facing rightward and the longitudinal direction of the second flat portion 302 facing up and down. The guide label 306 here is marked with the words "Pad Insertion Side R" and an arrow mark indicating the direction toward the leading end of the longitudinal direction of the second flat portion 302. The guide label 308 is attached to a position above the upper insertion screw hole 305 when the second flat portion 302 is oriented with the first flat portion 301 facing leftward and the longitudinal direction of the second flat portion 302 facing up and down. The guide label 308 here is marked with the words "Pad Insertion Side L" and an arrow mark indicating the direction toward the leading end of the longitudinal direction of the second flat portion 302. The shape and quantity of the guide labels 309 are not limited. For example, each of the guide label portions 306, 308 may be configured as a single label, or may be divided into multiple labels. The corners at both ends of the second flat portion 302 in the longitudinal direction are each chamfered to form a chamfered portion 312. The shape and size of the chamfered portion 312 are not limited.

[0023] The two extractor screws 32 are configured to be able to threadably engage with the screw holes 201, 221 of the pair of brake pads 20, 22 attached to the brake device 10. The extractor screws 32 are, for example, bolts with hexagonal heads. Alternatively, the extractor screws 32 may be fully threaded bolts without heads. The extractor screws 32 have a thread diameter that allows them to pass through the through holes 303 of the main body 30. When the diameter φ of the through holes 303 is 10 mm, the thread diameter of the extractor screws 32 is, for example, M8. The extractor screws 32 have a length that allows them to protrude from the opening 18 toward the outer surface of the case main body 12 when they are threadedly engaged with the screw holes 201, 221 of the pair of brake pads 20, 22 attached to the brake device 10.

[0024] The two extraction nuts 34 are nuts that can be screwed onto the two extraction long screws 32, respectively. The two flat washers 36 are washers that are passed through the two extraction long screws 32, respectively. The two extraction long screws 32 are threaded onto the two extraction nuts 34, respectively, and with the two flat washers 36 passed through, respectively, the two extraction long screws 32 are passed through the two through holes 303 of the main body 30 from the back side.

[0025] The two long insertion screws 38 are, for example, fully threaded bolts without heads. The two long insertion screws 38 are configured to be able to be threaded into the two respective insertion screw holes 305 of the main body 30. A pair of nuts 40 are closely threadedly engaged with one end of the long insertion screws 38. The pair of nuts 40 are non-rotatably fixed to the long insertion screws 38 by a so-called double-nut action. In other words, the pair of nuts 40 function as the heads of the long insertion screws 38. The long insertion screws 38 may also be bolts with heads. In this case, the pair of nuts 40 is not necessary.

[0026] The long insertion screw 38 has a thread diameter that allows it to be passed through the threaded insertion hole 305 of the main body 30. If the thread diameter of the threaded insertion hole 305 is M10, the thread diameter of the long extraction screw 32 is also M10. The long insertion screw 38 has a length that allows it to protrude from the opening 18 toward the outer surface of the case main body 12 of the brake device 10 when the brake pads 20, 22 are inserted into the brake device 10 by an insertion operation that will be described later.

[0027] 3. Brake pad insertion / removal method using a brake pad insertion / removal aid Next, the procedure for removing and inserting a brake pad using the brake pad insertion / removal aid of the embodiment will be described in detail.

[0028] Preparation process: Removal of shoe holders, etc. As a preliminary preparation, the worker removes the shoe holder and the like from the brake device 10. As a result, the front portions 20a, 22a of the pair of brake pads 20, 22 are exposed.

[0029] First step: First step of installing the brake pad insertion / removal aid 6 and 7 are diagrams illustrating the installation process of the brake pad insertion / removal aid during the removal work. FIG. 8 is a schematic diagram of the brake pad insertion / removal aid installed during the installation process, cut along a horizontal plane of the case body and viewed from above. In the first step of the work, the worker threads the extraction nuts 34 onto each of the two extraction long screws 32 and inserts flat washers 36. The worker holds the main body 30 on the outside of the case body 12 with the longitudinal direction of the main body 30 aligned with the left-right direction and with the arrow mark on the guide label 309 on the back side of the first flat portion 301 facing upward. This positions the main body 30 horizontally and holds it so that the second flat portion 302 is positioned below the first flat portion 301. The worker then inserts the extraction long screw 32 into the through-hole 303 on the right side of the main body 30 from the back side and screws it into the threaded hole 201 of the brake pad 20. Similarly, the worker passes another long extraction screw 32 through the through-hole 303 on the left side of the main body 30 from the back surface side, and screws it into the screw hole 221 of the brake pad 22. The main body 30 is configured so that the overall length L1 in the longitudinal direction is greater than the horizontal opening width W1, which is the width of the opening 18 in the left-right direction. Therefore, both ends on the front surface side of the first flat surface 301 come into contact with the outer surface 121 of the case main body 12.

[0030] Second process: Drawing process FIG. 9 is a diagram illustrating the brake pad extraction process during extraction work. In the second step of the work, the worker prepares a spanner wrench 50 that matches the size of the extraction nuts 34 and uses the spanner wrench 50 to evenly tighten the left and right extraction nuts 34. There are no limitations on the spanner wrench 50 that can be used. FIG. 9 illustrates the use of a ratchet-type open-end wrench as the spanner wrench 50. As the extraction nuts 34 are tightened, the extraction screws 32 move relatively in the extraction direction. As a result, each of the pair of brake pads 20, 22 connected to the extraction screws 32 is pulled out in the extraction direction with a small force.

[0031] Next, a method for inserting the pair of brake pads 20, 22 using the brake pad insertion / removal aid of the embodiment will be described in detail.

[0032] Third process: Brake pad preparation process In the third step of the work, the worker places the pair of brake pads 20, 22 to be newly installed in a position in the internal space 16 before the mounting position in the insertion direction.

[0033] Fourth step: Second installation step of brake pad insertion / removal aid FIG. 10 is a diagram illustrating the installation process of the brake pad insertion / removal aid during the brake pad insertion process. FIG. 11 is a schematic diagram of the brake pad insertion / removal aid installed during the installation process, with the case body cut along a vertical plane parallel to the insertion direction and viewed from the left. In the fourth step of the work, the worker holds the main body 30 in the internal space 16 of the case body 12 with the arrow mark on the guide label 306 on the front side of the second flat surface 302 facing upward. This positions the main body 30 so that the first flat surface 301 faces the outer surface of the brake pad 20. Then, the worker passes the extraction nut 34 through the positioning through hole 304 from the front side and screws it into the screw hole 201 of the right brake pad 20. Next, the worker secures a pair of nuts 40 to one end of each of the two long insertion screws 38 and screws the other end into each of the two insertion screw holes 305. The main body 30 is configured so that the overall length L1 in the longitudinal direction is greater than the vertical opening width H1, which is the vertical width of the opening 18. Therefore, both ends on the front surface side of the second flat surface 302 contact the inner surface 122 of the case main body 12.

[0034] Fifth step: Insertion of brake pad 20 In the fifth step of the work, the worker prepares a spanner wrench that matches the size of the nut 40 and uses the spanner wrench to evenly tighten each of the nuts 40 secured to the two upper and lower long insertion screws 38. There is no limitation on the type of spanner wrench that can be used. As the nuts 40 are tightened, the long insertion screws 38 secured to the nuts 40 move relatively in the insertion direction. The tips of the two long insertion screws 38 press evenly against the front portion 20a of the brake pad 20 in the insertion direction. This allows the brake pad 20 to be inserted into the brake device 10 with little force.

[0035] Sixth step: Second installation step of brake pad insertion / removal aid In the sixth step of the work, the worker holds the main body 30 on the side of the internal space 16 of the case body 12, with the arrow mark on the guide label 308 on the front side of the second flat portion 302 facing upward. This holds the main body 30 so that the first flat portion 301 is positioned on the outer surface side of the brake pad 20. Then, the worker passes the extraction nut 34 through the positioning through hole 304 from the front side and screws it into the screw hole 221 of the left brake pad 22. Next, the worker fixes a pair of nuts 40 to one end of each of the two long insertion screws 38 and screws the other end into each of the two insertion screw holes 305.

[0036] Seventh step: Insertion of the brake pad 22 In the seventh step, similar to the fifth step, the nuts 40 fixed to the upper and lower long insertion screws 38 are tightened evenly with a spanner wrench. This allows the brake pad 22 to be inserted into the brake device 10 with little force. Finally, necessary parts such as the shoe holder are attached.

[0037] 4. Function and effect of brake pad insertion / removal aid The brake pad insertion / removal aid described above provides the following functions and effects.

[0038] The main body 30 has a shape in which the first flat portion 301 and the second flat portion 302 are connected to form an L-shape in a cross section perpendicular to the longitudinal direction. This shape ensures strength with a simple configuration.

[0039] The main body 30 is configured so that the pitch between the two through holes 303 is the same as the pitch between the screw holes 201, 221 of the pair of brake pads 20, 22 attached to the brake device 10. With this configuration, when the two extraction screws 32 are threaded into the screw holes 201, 221, respectively, the two extraction screws 32 become parallel, which prevents the main body 30 from shifting position when the extraction nuts 34 are tightened.

[0040] The main body 30 is configured so that the total length L1 in the longitudinal direction is greater than the horizontal opening width W1 of the opening 18. With this configuration, when the main body 30 is placed in front of the opening 18 with its longitudinal direction aligned with the left-right direction of the opening during the operation of removing the brake pads 20, 22, it is possible to ensure that both ends of the main body 30 come into contact with the outer surface 121 of the case body 12.

[0041] Furthermore, the main body 30 is configured so that the overall length of the first flat surface 301 in the short direction is narrower than the vertical height of the opening 18. With this configuration, when the main body 30 is oriented so that its longitudinal direction coincides with the left-right direction of the opening, the work of removing the brake pads 20, 22 can be carried out while visually checking the internal space 16 through the opening 18.

[0042] The main body 30 is configured so that the overall length L1 in the longitudinal direction is greater than the vertical opening width H1 of the opening 18. With this configuration, when the main body 30 is placed in the internal space 16 with its longitudinal direction aligned with the height direction of the opening 18 during the insertion of the brake pads 20, 22, both ends of the main body 30 can be reliably brought into contact with the inner surface 122 of the case body 12.

[0043] Furthermore, the main body 30 is configured so that the overall length of the second flat portion 302 in the short direction is narrower than the width of the opening 18 in the left-right direction. With this configuration, the main body 30 can be placed in the internal space 16 during the insertion of the brake pads 20, 22.

[0044] Each of the two long extraction screws 32 has a length such that when one end is screwed into the threaded holes 201, 221 of the brake pads 20, 22 attached to the brake device 10, the other end protrudes from the opening 18. With this configuration, the two long extraction screws 32 can be passed through the through holes 303 of the main body 30, and then the extraction nuts 34 can be screwed onto the long extraction screws 32 and tightened.

[0045] Each of the two long extraction screws 32 has a flat washer passed through the gap between the main body 30 and the extraction nut 34. This configuration makes it easy to tighten the extraction nut 34.

[0046] During the operation of removing the brake pads 20, 22, the main body 30 is oriented so that the second flat portion 302 is located below the first flat portion 301. With this configuration, the worker can perform the tightening operation while visually checking the extraction nut 34. Furthermore, the worker can operate the spanner wrench 50 above the main body 30, improving work efficiency.

[0047] The main body 30 has chamfered corners 310, 312 at the leading edge of the first flat surface 301 in the short direction and at the leading edge of the second flat surface 302 in the short direction. This configuration facilitates insertion of the main body 30 into a narrow space, such as when installing the main body 30 in the internal space 16. It also prevents the corners from getting caught on the case body 12 or the like and causing scratches. This is also effective in preventing injuries to workers.

[0048] When inserting the brake pad 20, the long extraction screw 32 is passed through the positioning through-hole 304 and then threaded into the screw hole 201 of the brake pad 20. This configuration makes it easy to position the main body 30 relative to the brake pad 20. The same applies to the insertion of the brake pad 22.

[0049] The two screw insertion holes 305 are formed at positions where, when the pair of long insertion screws 38 are threadedly engaged with each other, the tips of the pair of long insertion screws 38 come into contact with the front surface 20a of the brake pad 20. With this configuration, by evenly tightening the pair of long insertion screws 38, it is possible to insert the brake pad 20 to the correct position.

[0050] A pair of nuts 40 are fixed to one end of the long insertion screw 38 in a so-called double-nut configuration. With this configuration, the nut 40 on the main body 30 side functions as a restricting member that prevents the open-end wrench hung on the nut 40 on the end side from shifting in the insertion direction. This improves the work efficiency of the worker who handles the nuts 40.

[0051] When inserting the brake pad 20, the main body 30 is positioned so that the first flat surface 301 is located on the right side of the outer surface of the brake pad 20. When inserting the brake pad 22, the main body 30 is positioned so that the first flat surface 301 is located on the right side of the outer surface of the brake pad 22. This positioning allows the worker to easily view the internal space 16 from the opening 18, improving workability. [Explanation of symbols]

[0052] 10 Brake device, 12 Case body, 14 Brake disc, 16 Internal space, 18 Opening, 20, 22 Brake pad, 20a, 22a Front portion, 30 Main body, 32 Extraction long screw, 34 Extraction nut, 36 Flat washer, 38 Insertion long screw, 40 Nut 50 Spanner wrench 121 Outer surface 122 Inner surface 201, 221 Screw hole portion, 301 First flat portion, 302 Second flat portion, 303 Through hole, 304 Positioning through hole, 305 Insertion screw hole portion, 306, 308 Guide label portion, 309 Guide label portion, 310, 312 Chamfered portion

Claims

1. A brake pad insertion / removal aid used when pulling out a pair of brake pads installed in an internal space of a brake device of an elevator hoisting machine from an opening communicating with the internal space, The pair of brake pads each have a screw hole portion on a front surface facing the opening, The brake pad insertion / removal aid is a main body portion in which the first planar portion and the second planar portion are connected to each other so as to form an L-shape in a cross section perpendicular to the longitudinal direction; two long extraction screws that are threaded into the respective screw holes; two pull-out nuts threaded onto the two long screws, respectively; The first flat portion has two through holes formed along the longitudinal direction with diameters larger than the outer diameter of the pull-out screw, The main body is configured such that the overall length of the first planar portion in the short side direction is smaller than the vertical opening width of the opening, In the operation of removing the pair of brake pads, The two long extraction screws are configured so that one end thereof is threaded into the respective screw hole portions when the two long extraction screws are inserted into the respective through holes, The two extraction nuts are threaded between the other ends of the two long extraction screws and the main body, respectively. A brake pad insertion / removal aid configured as follows.

2. The two through holes are formed at the same pitch as the pitch between the screw holes of the pair of brake pads. The brake pad insertion / removal aid according to claim 1.

3. The main body has a longitudinal length of the first planar portion that is greater than a lateral opening width of the opening.

3. The brake pad insertion / removal aid according to claim 1 or 2.

4. two flat washers that are passed through the two long extraction screws, respectively, and sandwiched between the extraction nut and the through hole; 3. The brake pad insertion / removal aid according to claim 1 or 2.

5. In the pulling-out operation, the main body portion The second planar portion is disposed in an orientation such that it is located below the first planar portion.

3. The brake pad insertion / removal aid according to claim 1 or 2.

6. The main body portion is The corners of the first flat surface portion on the tip side in the lateral direction and the corners of the second flat surface portion on the tip side in the lateral direction are each provided with a chamfered portion.

3. The brake pad insertion / removal aid according to claim 1 or 2.

7. The second planar portion is A pair of insertion screw holes are provided side by side in the longitudinal direction, The brake pad insertion / removal aid is a pair of long insertion screws each having a head at one end and a screw hole at the other end, In the brake pad insertion operation, The main body is disposed in the internal space at a position where the second flat surface contacts the inner surface of the opening and the other end sides of the pair of long insertion screws threaded into the insertion screw hole contact the front surface of the brake pad. The brake pad insertion / removal aid according to claim 1.

8. a positioning through hole formed between the pair of insertion screw hole portions and having a diameter larger than an outer diameter of the extraction screw; In the insertion operation, The long pull-out screw is threaded into the screw hole of the brake pad through the positioning through hole.

8. The brake pad insertion / removal aid according to claim 7, which is configured as follows:

9. The pitch between the pair of insertion screw holes is configured to be narrower than the length of the front portion of the brake pad in the longitudinal direction.

9. The brake pad insertion / removal aid according to claim 7 or 8.

10. The main body has a longitudinal length of the second flat surface that is greater than a longitudinal width of the opening.

9. The brake pad insertion / removal aid according to claim 7 or 8.

11. In the insertion operation, the main body portion The first flat portion is disposed in an orientation facing the outer surface of the brake pad.

9. The brake pad insertion / removal aid according to claim 7 or 8.

12. 3. A brake pad insertion / extraction method for pulling out a pair of brake pads installed in an internal space of a brake device of an elevator hoisting machine from an opening communicating with the internal space of the brake device using the brake pad insertion / extraction assisting tool according to claim 1 or 2, a step of threading the two extraction nuts onto the two long extraction screws, respectively; a first installation step of placing the main body portion on the outer surface side of the opening, passing the two long extraction screws through the two through holes, respectively, and screwing one end of each of the two long extraction screws into the corresponding screw hole portion; tightening the two extraction nuts; A brake pad insertion / removal method comprising:

13. In the first installation step, the main body portion is disposed in an orientation in which the second flat portion is located below the first flat portion. The brake pad insertion / removal method according to claim 12.

14. A brake pad insertion / extraction method for inserting brake pads into installation positions through an opening communicating with an internal space of a brake device of an elevator hoisting machine using the brake pad insertion / extraction assisting tool according to claim 7 or 8, disposing the brake pad at a position in the internal space that is closer to the mounting position in an insertion direction; a second installation step of placing the main body in the internal space at a position where the second flat surface contacts the inner surface of the opening and the other end sides of the pair of long insertion screws threaded into the insertion screw hole contact the front surface of the brake pad; tightening the pair of long insertion screws; A brake pad insertion / removal method comprising:

15. In the second installation step, the main body portion is disposed in an orientation in which the first flat portion is located on the outer surface side of the brake pad. The brake pad insertion / removal method according to claim 14.

16. The main body portion is a positioning through hole formed between the pair of insertion screw hole portions and having a diameter larger than an outer diameter of the extraction screw; The second installation step further includes a step of threading the long pull-out screw through the positioning through-hole into the screw hole of the brake pad. The brake pad insertion / removal method according to claim 14.

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