CN117108617A - Anti-loose device and passenger conveyor - Google Patents

Abstract

The utility model provides a looseness preventing device capable of preventing looseness of bolts for fixing steps of a passenger conveyor. The bracket includes a first surface fixed to the bearing by a bolt and a second surface erected on the first surface, a plurality of concave portions are formed on an inner peripheral surface of the rotation stopping portion so as to be attachable to the bolt at predetermined angles in a rotation direction of the bolt, and a curved surface is formed on an outer peripheral surface of the rotation stopping portion so as to abut against the second surface when the bolt is rotated in a loosening direction by an angle larger than the predetermined angle when the locking device is attached to the bolt so as to face the second surface.

Description

Anti-loose device and passenger conveyor

Technical Field

The present utility model relates generally to a technique of preventing loosening of bolts that fix steps of a passenger conveyor.

Background

Conventionally, when a passenger conveyor is installed, maintained, or the like, an operator performs operations such as disassembly, assembly, and adjustment of constituent members. In this operation, an operator unscrews or tightens bolts (hereinafter referred to as bolts) called rotation tightening fittings. When such work is done, the bolts are firmly secured with a controlled tightening force using an appropriate tool.

However, for example, the steps of the passenger conveyor continuously vibrate during traveling and when passengers get on and off the elevator, and thus there is a problem in that the bolts gradually loosen to lower the fixing force of the constituent members.

In this regard, a loosening prevention tool for a rotation fastening tool for maintaining a fixing force has been proposed (see patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent application registration No. 3104843

Disclosure of Invention

Problems to be solved by the utility model

In the technique described in patent document 1, since the portion that resists the rotational force generated in the loosening direction of the bolt is the rotation stopping piece formed with the thin portion that flexes when the bolt is hooked to the component, there is a possibility that the thin portion cannot function sufficiently as the locking piece when the thin portion is greatly deformed or broken by the rotational force.

The present utility model has been made in view of the above problems, and an object of the present utility model is to provide a loosening prevention device and the like capable of preventing loosening of a bolt for fixing a step of a passenger conveyor.

Means for solving the problems

In order to solve the above-described problems, the present utility model provides a locking device that can be attached to a bolt for fixing a bearing of a chain for driving a step of a passenger conveyor and a bracket for preventing loosening of the bolt, the bracket being provided to a frame of the step, the locking device being provided with a rotation stopping portion formed in a plate shape and having a through hole penetrating in a thickness direction, the bracket being provided with a first surface fixed to the bearing by the bolt and a second surface standing on the first surface, a plurality of recesses being formed in an inner peripheral surface of the rotation stopping portion so as to be attachable to the bolt at predetermined angles in a rotation direction of the bolt, and a curved surface being formed in an outer peripheral surface of the rotation stopping portion so as to abut against the second surface when the bolt is rotated in a loosening direction by an angle larger than the predetermined angle when the locking device is attached to the bolt so as to face the second surface.

In the above configuration, when the locking device is attached so as to face the second surface, the curved surface of the rotation stop portion abuts against the second surface when the bolt is rotated at an angle larger than a predetermined angle (for example, 20 degrees, 40 degrees, etc. when the predetermined angle is 15 degrees). According to the above configuration, for example, when the bolt rotates in the loosening direction, the plate-shaped rotation stop portion abuts against the bracket, so that the rotation (loosening) of the bolt can be prevented.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present utility model, a loosening prevention device for preventing loosening of a bolt for fixing a step of a passenger conveyor can be realized. The problems, structures, and effects other than those described above will be apparent from the following description of the embodiments.

Drawings

Fig. 1 is a view showing an example of a passenger conveyor according to a first embodiment.

Fig. 2 is a diagram showing an example of the locking device according to the first embodiment.

Fig. 3A is a diagram showing an example of the locking device according to the first embodiment.

Fig. 3B is a diagram showing an example of the locking device according to the first embodiment.

Fig. 3C is a diagram showing an example of the locking device according to the first embodiment.

Fig. 3D is a diagram showing an example of the locking device according to the first embodiment.

Fig. 3E is a diagram showing an example of the locking device according to the first embodiment.

Fig. 4 is a diagram for explaining a method of mounting the anti-loosening device of the first embodiment.

Fig. 5 is a diagram for explaining a method of mounting the anti-loosening device of the first embodiment.

Fig. 6 is a diagram for explaining a method of mounting the anti-loosening device of the first embodiment.

Fig. 7 is a diagram for explaining a method of mounting the anti-loosening device of the first embodiment.

Fig. 8 is a diagram for explaining a method of mounting the anti-loosening device of the first embodiment.

Fig. 9 is a diagram for explaining a method of preventing loosening of a bolt according to the first embodiment.

Fig. 10 is a diagram for explaining a method of confirming fastening of a bolt according to the first embodiment.

Fig. 11 is a diagram for explaining a method of confirming fastening of a bolt according to the first embodiment.

Fig. 12 is a diagram showing an example of the locking device according to the first embodiment.

Fig. 13 is a view showing an example of the locking device according to the first embodiment.

In the figure: 100 passenger conveyor; 200 anti-loosening devices; 210 a rotation stop; 220 anti-drop portions.

Detailed Description

(I) First embodiment

An embodiment of the present utility model is described in detail below. However, the present utility model is not limited to the embodiment.

In this embodiment, a loosening preventing device mounted to a rotation fastening fitting for fixing a step of a passenger conveyor will be described. Hereinafter, a bolt for fixing (connecting) the step and the chain of the passenger conveyor will be described as an example of the rotation fastening fitting.

Here, in the anti-loosening device for preventing the loosening of the bolts, which is not provided on the premise of fixing the steps of the passenger conveyor, the anti-loosening device may not be mounted on the premise of the bolts being reversed with respect to the ground, and therefore, the anti-loosening device may be disengaged in the state of the bolts being reversed.

Further, although the fastening of all bolts is assumed, since the fastening work (manual fastening) of bolts is performed by a human hand, there are bolts which are fastened without using an appropriate tool or without being fixed with an appropriate fastening force occasionally, and bolts in a so-called "manual fastening state". For example, as in the loosening prevention tool for a rotation tightening tool described in patent document 1, in a structure in which all bolts are covered, there is a problem that it is impossible to distinguish whether or not the bolts are in a manually tightened state at the time of installation and after installation.

In this regard, the anti-loosening device of the present embodiment includes the rotation stop portion and the anti-drop portion provided integrally with the rotation stop portion.

The rotation stop portion includes: a recess (insertion groove) formed with recesses corresponding to a plurality of fixing angles of the fixing bolt; and an abutting portion having a width that abuts against the constituent member when rotated together with the bolt. The contact portion is formed with a curved surface set to be larger than the rotation radius (locus) of the lock device.

The drop-off prevention portion is formed to clamp the constituent members of the passenger conveyor from the up-down direction or the left-right direction. The anti-drop portion is an elastic body having a function of stopping rotation of the bolt by abutting (contacting) the component. For example, as a structure for sandwiching the constituent members of the passenger conveyor from the up-down direction, the drop-off prevention portion may have: a step portion for providing a space avoiding a spring washer fixed together with the bolt; and a locking portion (end stop portion) which is adjusted to a size when the bolt is properly fixed, and which is arranged at the center of the recess portion and has a width smaller than a thread diameter of the bolt.

In the above configuration, when the locking device is mounted to the bolt fixed at an arbitrary angle, the locking device can be easily mounted by the plurality of recesses (insertion grooves) corresponding to the angle. Even when there is a bolt fixed at an angle between the plurality of concave portions, the anti-drop portion made of an elastic body is deformed, so that the bolt can be fitted into the concave portion of the approaching angle.

In the above configuration, for example, when a strong rotation is applied to the drop-off prevention portion and the drop-off prevention portion is deformed beyond the elastic force, the abutment portion of the rotation stop portion can abut against the constituent member to prevent the rotation (loosening) of the bolt. Further, since the anti-drop portion made of the elastic body is fixed by sandwiching the component member by the restoring force of the elastic body, the anti-loose device does not drop even if the component member is constantly reversed up and down like a bolt for fixing the step and the chain of the passenger conveyor.

Here, the dimension between the upper surface of the rotation stopper and the engagement surface of the engagement portion provided in the anti-drop portion may be a dimension when the bolt is fastened with a predetermined torque (fastening force). In this case, even if the locking device is attached to the bolt in the manual fastening state, the dimension in the thickness direction of the spring washer (the dimension of the difference in height from the spring washer in the fully crushed state) that is not fully crushed during manual fastening is exposed from the upper surface of the rotation stopper, so that it can be visually determined whether the bolt is fully fixed.

The expressions "first", "second", "third", and the like in the present specification are added for identifying the constituent elements, and are not necessarily limited in number or order. The numbers for identifying the constituent elements are used for each context, and numbers used in 1 context do not necessarily indicate the same structure in other contexts. In addition, the functions of the components identified by a certain number and the components identified by another number are not hindered.

Next, embodiments of the present utility model will be described with reference to the drawings. The following description and drawings are illustrative of the present utility model, and are omitted or simplified as appropriate for clarity of description. The utility model can also be implemented in other various ways. The constituent elements may be single or plural, as long as they are not particularly limited.

In the following description, the same reference numerals are given to the same elements in the drawings, and the description thereof is omitted as appropriate. In the case where the description is made without distinguishing the same elements, a common part (a part other than the branch number) of the reference symbol including the branch number may be used, and in the case where the description is made with distinguishing the same elements, the reference symbol including the branch number may be used. For example, when the description is not particularly made for the sprocket, it is referred to as "sprocket 130", and when the description is made for each sprocket, it is sometimes referred to as "sprocket 130-1" and "sprocket 130-2".

In fig. 1, 100 denotes a passenger conveyor of a first embodiment as a whole.

The passenger conveyor 100 is an escalator, a moving walk, or the like. More specifically, passenger conveyor 100 includes moving handrail 110, steps 120, sprocket 130, and chain 140.

Step 120 is pivotally supported by an endless chain 140. The upper sprocket 130-1 and the lower sprocket 130-2 are wound around the chain 140. The sprocket 130 is rotated by power of the driving motor. Chain 140 circulates with steps 120 as sprocket 130 rotates.

More specifically, step 120 includes tread 121 on which a passenger rides, and frame 122 supporting tread 121. The frame 122 is provided with a bracket 123. The bracket 123 has a receiving space in which a bolt 125 with a spring washer 124 can be mounted. The bracket 123 includes a bottom surface (a first surface fixed to the bearing 141 by the bolt 125) that is a surface opposite to the tread 121, and a side surface (a second surface) that is provided upright on the bottom surface. A through hole through which the bolt 125 is inserted is provided in the bottom surface of the bracket 123.

Hereinafter, the bolt 125 will be described by taking a bolt having a head in the shape of a regular hexagon as an example, but the shape of the head is not limited to the regular hexagon. For example, the shape of the head may be a polygon such as a quadrangle or an octagon. The bolt 125 is described by taking a bolt (right screw) that is tightened when rotated clockwise and loosened when rotated counterclockwise as an example, but the present utility model is not limited thereto. The structure of the locking device 200 described later, which is changed right and left, or the structure of the locking device which is symmetrical right and left, can be applied to a left screw.

A step shaft (front shaft) is pivotally supported at a predetermined interval by the chain 140. A bearing 141 is provided at a position laterally symmetrical with respect to the center of the step shaft. The bearing 141 is provided with a screw hole.

When fixing step 120 to bearing 141, the operator places through-holes of bracket 123 so as to engage with screw holes of bearing 141, screws 125 into the screw holes of bearing 141, and fastens bracket 123 to bearing 141. Thus, step 120 is coupled to chain 140 via a step shaft. In other words, the bearing 141 provided to the chain 140 and the bracket 123 provided to the step 120 are fixed by the bolt 125.

Conventionally, an operator fixes the bolt 125 with an appropriate tightening force by a hand, and then bends a part of the confirmation device 126 indicating that the bolt 125 is tightened. A color (for example, red) that is easily visually recognized by another operator is added to the folded surface 126A, and double confirmation is easily performed. The verification device 126 is, for example, a red tongue washer made of a metal such as aluminum having a thickness of several mm.

However, when the worker is to bend the confirmation device 126 in a state where the bolt 125 is not fastened with an appropriate fastening force, the fixing state of the bolt 125 cannot be determined. Further, the confirming device 126 itself does not have strength capable of receiving the rotational force acting on the bolt 125 in the loosening direction, and there is a problem that it is difficult to manually bend if the strength is ensured.

Hereinafter, the loosening prevention device 200 for preventing loosening of the bolts 125 that fix the steps 120 of the passenger conveyor 100 and solving the problem that the fixing state of the bolts 125 is unknown will be described.

Fig. 2 and 3A to 3E are diagrams showing an example of the anti-loosening device 200. Fig. 3A shows the case where the anti-loosening device 200 is viewed from the upper side (direction 201). Fig. 3B shows the case where the anti-loosening device 200 is viewed from the right side (direction 202). Fig. 3C shows the case where the anti-loosening device 200 is viewed from the lower side (direction 203). Fig. 3D shows the case where the anti-loosening device 200 is viewed from the front (direction 204). Fig. 3E shows the case where the anti-loosening device 200 is viewed from the back (direction 205).

The lock device 200 is mounted, for example, on a bolt 125 having a bracket 123 as a connecting portion between the steps 120 and the chain 140, which are constituent members of the passenger conveyor 100, and a spring washer 124 used for the purpose of fixing the bearing 141. For example, the lock device 200 is an injection molded product made of synthetic resin formed such that the entire shape of the lock device 200 is substantially J-shaped. The material of the lock device 200 is nylon (polyamide synthetic resin), ABS resin (resin composed of a combination of 3 components, such as acrylonitrile, butadiene, and styrene), PET (Poly Ethylene Terephthalate: polyethylene terephthalate), polycarbonate, or the like. In addition, a part (e.g., the back surface) or the whole of the anti-loosening device 200 is colored in a prescribed color (e.g., red) so as to easily confirm whether or not it is mounted.

More specifically, the anti-loosening device 200 includes a rotation stopper 210 and an anti-drop portion 220. The rotation stopper 210 is formed in a plate shape, and has a through hole (through hole penetrating in the thickness direction) through which the bolt 125 is inserted. The thickness of the rotation stopper 210 may be the same as the thickness of the head of the bolt 125.

A plurality of recesses 211 are formed in the inner peripheral surface of the rotation stopper 210 so as to be attachable (fittable) at predetermined angles (for example, 20 degrees and 15 degrees) in the rotation direction of the bolt 125. The concave portion 211 is, for example, an insertion groove, and has a cross-sectional shape in which V-shaped portions (for example, 18 or 24V-shaped portions) are circumferentially continuous, the number of which is an integer multiple of 6. Incidentally, if the number of concave portions 211 is too small, it is difficult to fit, and if too large, the bolt 125 cannot be blocked, so that the predetermined angle is preferably about 15 degrees.

A curved surface 212 is formed on the outer peripheral surface of the rotation stopper 210 so as to abut against the bracket 123 when the bolt 125 is rotated in the loosening direction by an angle larger than a predetermined angle when the locking device 200 is mounted so as to face the side surface of the bracket 123. The curved surface 212 has a width 301 that can come into contact with the bracket 123 and stop when rotated in the loosening direction together with the bolt 125. Further, a flat portion 213 for clamping and removing the anti-loosening device 200 with a tool is provided on the outer peripheral surface of the rotation stop portion 210.

The drop-off prevention portion 220 includes a step 221 and a grip 222, and the locking device 200 is locked by the step 221 and the grip 222. The step 221 is a portion for providing a space avoiding the spring washer 124 fixed together with the bolt 125. For example, the step 221 is connected to the rotation stopper 210, and has a height 302 equal to the height of the spring washer 124 (the dimension of the bolt 125 in a state where the spring washer 124 is appropriately fixed and crushed) when the bolt 125 is fastened with a predetermined fastening force in the thickness direction of the rotation stopper 210. The grip 222 is a portion that contacts a component (in this example, the bolt 125) of the step 120 when the anti-loosening device 200 is attached to the bolt 125. The grip 222 has a width 303 smaller than the nominal diameter (thread diameter) of the bolt 125, and is disposed at the center of the through hole of the rotation stopper 210 when the locking device 200 is mounted to the bolt 125.

When the anti-loosening device 200 is attached to the bolt 125, the step 221 and the grip 222 are disposed at positions sandwiching the bracket 123 and the bearing 141 from both sides in the thickness direction of the rotation stop portion 210.

The drop-off prevention portion 220 is an elastic body, and when the anti-loosening device 200 is attached to the bolt 125, it is in contact with the component (in this example, the bracket 123) of the step 120, thereby reducing the rotational force in the loosening direction.

Next, a method of mounting the lock device 200 will be described with reference to fig. 4 to 8.

As shown in fig. 4, the worker attaches the lock device 200 to the bolt 125 that completely fixes the bracket 123 provided in the bearing 141 from the opening direction 400 of the bracket 123 having good workability. The rotation stop portion 210 is provided with a plurality of recesses 211 so that the bolt 125 can be mounted regardless of the direction in which the bolt 125 is fixed, and therefore, an operator does not need to adjust the fixed state (angle) of the bolt 125 when mounting the anti-loosening device 200.

As shown in fig. 5, the anti-loosening device 200 includes an opening height 503 indicating a height from the grip surface 501 of the grip 222 to the lower surface 502 of the rotation stopper 210. When the worker attaches the lock device 200 to the bolt 125, the operator presses the grip 222 of the lock device 200 in the direction 510 in which the opening height 503 is enlarged, within the elastic range. The dimensions of the bolt 125 in which the spring washer 124 is crushed are described as the opening height 503, but may be smaller than the dimensions in order to hold the constituent members more firmly.

As shown in fig. 6, the operator inserts the bolt 125 into the rotation stopper 210, and releases the grip 222. When the bolt 125 is completely fixed, the spring washer 124 is compressed, and the spring washer 124 is crushed, so that the upper surface 601 of the head of the bolt 125 and the upper surface 602 of the rotation stopper 210 are flush with each other. When the operator releases the grip 222, the lock device 200 returns to the opening height 503.

As shown in fig. 7 and 8, in the anti-loosening device 200 attached to the bolt 125, the anti-loosening portion 220 (the step portion 221 and the grip portion 222) grasps the constituent members from both sides in the axial direction of the bolt 125. According to this structure, even if the locking device 200 is used for the bolt 125 used for the step 120 that changes in the up-down direction, the locking device 200 never falls off.

Next, a structure (method) for preventing loosening of the bolt 125 will be described with reference to fig. 9.

As shown in fig. 9, when the bolt 125 rotates 900 in the loosening direction, the rotation stopper 210 also rotates along a track 901 following the rotation 900.

In the rotation 900, first, the loosening can be prevented by the falling-off preventing portion 220 that contacts the bracket 123. Even when a stronger loosening force is applied to the rotation 900 and the anti-drop portion 220 deforms beyond the elastic force, the curved surface 212 whose curvature is set larger than the locus 901 of the rotation radius 902 of the rotation stop portion 210 stops loosening at the contact point 903. More specifically, when the locking device 200 is attached to the bolt 125 so as to face the side surface 904 of the bracket 123, the curved surface 212 is formed to abut against the side surface 904 of the bracket 123 when the bolt 125 is rotated by an angle larger than a predetermined angle (for example, 15 degrees) in the loosening direction. By setting the surface of the rotation stopper 210 abutting against the bracket 123 as a curved surface 212 instead of a flat surface, the space has room (play), which is advantageous for the installation of the anti-loosening device 200.

In this way, in the anti-loosening device 200, the curved surface 212 is formed in the rotation stop portion 210, thereby improving the workability and the slack prevention performance.

Here, the bolts 125 are manually fastened, but may be left in an incompletely fastened state due to an interruption of work or the like. A method of confirming that the confirmation bolt 125 is properly fastened will be described with reference to fig. 10 and 11.

As shown in fig. 10, in the case where the bolt 125 is completely fixed, a dimension 1002 from the upper surface 602 of the rotation stopper 210 to the bracket 123 and the ground plane 1001 of the spring washer 124 is a sum of a space (the height 302 of the spring washer 124) of a thickness in which a state in which the spring washer 124 is completely compressed is supposed to be completely crushed and a thickness 1011 of the rotation stopper 210. In this case, the dimension from the lower surface 502 of the rotation stopper 210 to the grip surface 501 of the grip 222 coincides with the opening height 503.

As shown in fig. 11, for example, the locking device 200 is mounted on the bolt 125 in a manually fastened state.

In the case of the bolt 125 in the manual fastened state, a part of the spring washer 124 enters the rotation stopper 210, and the spring washer 124 does not become in the fully crushed state, but a difference size 1101 from the spring washer 124 in the fully crushed state occurs. In this case, the bolt 125 is exposed from the upper surface 602 of the rotation stopper 210 by the same dimension as the differential dimension 1101 with respect to the dimension 1002 that does not change from the ground plane 1001. In addition, a space of a difference dimension 1101 also appears between the grip portion 222 of the bolt 125 and the bottom surface of the bolt 125. Therefore, the mounted state of the lock device 200 and the bolt 125 can be easily confirmed by visual inspection.

Here, in the anti-loosening device 200, the grip 222 of the anti-loosening portion 220 is formed in a tapered shape (tapered end) so as to be able to come into contact with the bolt 125, but the shape is not limited thereto. For example, as shown in fig. 12 and 13, the drop-off preventing portion 220 may be provided in accordance with the shape of the bracket 123, the bearing 141, or the like.

As shown in fig. 12, a wide grip 1200 having a width wider than the diameter of the screw hole of the bearing 141 may be formed in the drop-off preventing portion 220.

As shown in fig. 13, a grip 1300 having a protrusion 1301 that is easily inserted into a screw hole of the bearing 141 may be formed in the drop-off prevention portion 220.

According to the present embodiment, it is possible to provide a loosening prevention device of a rotation fastening fitting, which can prevent loosening of the rotation fastening fitting, and can judge whether the rotation fastening fitting is properly fixed at the time of installation.

(II) additional notes

The above embodiment includes, for example, the following.

In the above embodiment, the case where the bolt 125 is a bolt with a spring washer has been described, but the present utility model is not limited to this. For example, the bolt 125 may be a bolt without a spring washer. In this case, no step is provided in the anti-loosening device.

In the above embodiment, the case where the screw hole of the bearing 141 is a through hole was described, but the present utility model is not limited to this. For example, the screw hole of the bearing 141 may be a screw hole (indentation, recess, or the like).

In the above embodiment, the case where the lock device 200 is attached to the bolt 125 has been described, but the present utility model is not limited to this. For example, the locking device 200 may be attached to the bolt 125 to which the verification device 126 is attached (the locking device 200 is attached from above the verification device 126).

In the above embodiment, the case where the concave portion 211 is provided on the entire inner peripheral surface of the rotation stopper 210 has been described, but the present utility model is not limited to this. For example, the recess 211 may be provided in a part of the inner peripheral surface of the rotation stopper 210 (for example, the front surface side, the rear surface side, and the left and right side surfaces).

In the above embodiment, as shown in fig. 11, the case where the spring washer 124 enters the rotation stopper 210 when the lock device 200 is attached to the bolt 125 in the manual fastening state has been described, but the present utility model is not limited to this. For example, the shape (size) of the spring washer 124 may be a shape (size) that does not enter the rotation stopper 210.

The above embodiment has, for example, the following characteristic configuration.

(1) A locking device (e.g., locking device 200) which can be mounted to a bolt (e.g., bolt 125) for fixing a bearing (e.g., bearing 141) and a bracket (e.g., bracket 123) of a chain (e.g., chain 140) for driving a step (e.g., step 120) of a passenger conveyor (e.g., passenger conveyor 100) and which is provided to a frame (e.g., frame 122) of the step, characterized in that,

the bracket includes a first surface (bottom surface) fixed to the bearing by the bolt and a second surface (surface mounted to the housing 122) erected on the first surface, a plurality of concave portions (e.g., concave portions 211) are formed in an inner peripheral surface of the rotation stopping portion so as to be mounted to the bolt at predetermined angles in a rotation direction of the bolt, and a curved surface (e.g., curved surface 212) is formed in an outer peripheral surface of the rotation stopping portion so as to be abutted against the second surface when the bolt is rotated in a loosening direction by an angle larger than the predetermined angle when the locking device is mounted to the bolt.

In the above configuration, when the locking device is attached so as to face the second surface, the curved surface of the rotation stop portion abuts against the second surface when the bolt is rotated at an angle larger than a predetermined angle (for example, 20 degrees, 40 degrees, etc. when the predetermined angle is 15 degrees). According to the above configuration, for example, when the bolt rotates in the loosening direction, the plate-shaped rotation stop portion abuts against the bracket, so that the rotation (loosening) of the bolt can be prevented.

(2) The bearing and the bracket are fixed by the bolt, and the rotation stop portion is formed such that an upper surface (for example, an upper surface 601) of a head portion of the bolt and an upper surface (for example, an upper surface 602) of the rotation stop portion are positioned on the same plane (for example, refer to fig. 6) when the locking device is mounted to the bolt.

According to the above configuration, for example, in the case where the bolt is fastened only halfway, the head portion of the bolt protrudes from the rotation stop portion, and therefore, the operator can easily grasp that the bolt is not fastened properly.

(3) The bolt is a bolt with a spring washer (e.g., spring washer 124), and the locking device includes a step portion (e.g., step portion 221) that is connected to the rotation stop portion and has the same height in the thickness direction of the rotation stop portion as the spring washer when the bolt is fastened with a predetermined torque.

According to the above configuration, for example, when the bolt with the spring washer is not fastened with a predetermined torque, the head portion of the bolt protrudes from the rotation stop portion, and therefore, the operator can easily grasp that the bolt is not fastened with a predetermined torque.

(4) A flat portion (for example, a flat portion 213) for holding and removing the anti-loosening device by a tool is provided on the outer peripheral surface of the rotation stop portion.

According to the above configuration, for example, the worker can detach the locking device using a tool during the step removal operation, and thus the operation time can be shortened.

(5) The locking device includes a drop-off preventing portion (e.g., drop-off preventing portion 220) provided with a first locking portion (e.g., step portion 221) and a second locking portion (e.g., grip portion 222), the first locking portion being the step portion, and the first locking portion and the second locking portion being disposed at positions sandwiching the bracket and the bearing from both sides in a thickness direction of the rotation preventing portion when the locking device is mounted to the bolt (see, for example, fig. 7).

According to the above configuration, for example, even in the case of the step reversal, the loosening prevention device can be prevented from falling off.

(6) The above-mentioned anti-loose device is formed of synthetic resin.

According to the above configuration, for example, the worker can flex the anti-drop portion, and therefore, the anti-loosening device can be easily attached to the bolt.

The above-described structure may be modified, rearranged, combined, or omitted as appropriate within the scope of the present utility model.

It is to be understood that the items included in the list in such a form of "at least 1 of A, B and C" can represent (a), (B), (C), (a and B), (a and C), (B and C) or (A, B and C). Likewise, an item listed in the form of "at least 1 of A, B or C" can represent (a), (B), (C), (a and B), (a and C), (B and C), or (A, B and C).

Claims (7)

1. A locking device which can be mounted on a bolt for fixing a bearing and a bracket of a chain for driving a step of a passenger conveyor, for preventing loosening of the bolt, the bracket being provided to a frame of the step,

comprises a rotation stopping part which is formed into a plate shape and is provided with a through hole penetrating in the thickness direction,

the bracket is provided with a first surface fixed on the bearing through the bolt and a second surface vertically arranged on the first surface,

a plurality of concave parts are formed on the inner peripheral surface of the rotation stopping part so as to be capable of being mounted on the bolt at intervals of a prescribed angle in the rotation direction of the bolt,

a curved surface is formed on an outer peripheral surface of the rotation stop portion so as to abut against the second surface when the bolt is rotated in a loosening direction by an angle larger than the predetermined angle when the locking device is attached to the bolt so as to face the second surface.

2. The anti-loosening device as claimed in claim 1, wherein,

the bearing and the bracket are fixed by the bolt, and the rotation stopping part is formed such that the upper surface of the head of the bolt and the upper surface of the rotation stopping part are positioned on the same plane when the anti-loose device is mounted on the bolt.

3. The anti-loosening device as claimed in claim 2, wherein,

the bolt is a bolt with a spring washer,

the anti-loosening device includes a step portion that is connected to the rotation stop portion and has a height in a thickness direction of the rotation stop portion that is the same as a height of a spring washer when the bolt is fastened with a predetermined torque.

4. The anti-loosening device as claimed in claim 3, wherein,

a flat portion for holding and removing the anti-loosening device by a tool is provided on the outer peripheral surface of the rotation stop portion.

5. The anti-loosening device as claimed in claim 3, wherein,

comprises an anti-falling part provided with a first locking part and a second locking part,

the first locking part is the step part,

when the locking device is attached to the bolt, the first locking portion and the second locking portion are disposed at positions sandwiching the bracket and the bearing from both sides in a thickness direction of the rotation stop portion.

6. The anti-loosening device as claimed in claim 5, wherein,

the anti-loosening device is formed of synthetic resin.

7. A passenger conveyor comprising steps, bearings for chains for driving the steps, and brackets provided in a frame of the steps are fixed by bolts,

the bracket is provided with a first surface fixed on the bearing through the bolt and a second surface vertically arranged on the first surface,

a locking device is mounted on the bolt, the locking device is provided with a rotation stopping part which is formed into a plate shape and is provided with a through hole penetrating along the thickness direction,

a plurality of concave parts are formed on the inner peripheral surface of the rotation stopping part so as to be capable of being mounted on the bolt at intervals of a prescribed angle in the rotation direction of the bolt,

a curved surface is formed on an outer peripheral surface of the rotation stop portion so as to abut against the second surface when the bolt is rotated in a loosening direction by an angle larger than the predetermined angle when the locking device is attached to the bolt so as to face the second surface.