JP4956042B2 - Truss fall prevention device - Google Patents

Description

  The present invention relates to a truss fall prevention device, and more particularly, to a truss fall prevention device that prevents a truss that is out of a support position on an installation structure from falling to a lower floor when an earthquake occurs.

As described in Patent Document 1 below, the escalator has a truss installed between the upper floor and the lower floor of the installation structure. The upper floor side and lower floor side of the truss are provided with support parts, respectively. These support parts have a structure in which the vibration of the installation structure is not directly transmitted to the truss, for example, a structure using a long hole and a bolt. It is fixed.
JP-A-5-294590

  However, in the escalator described in Patent Document 1, the following points are not considered.

  When a large earthquake occurs, the fixing part between the truss and the installation structure may be destroyed, and the support part may be disengaged from the support position for the installation structure.

  When the upper floor side support part is out of the support position for the installation structure, the upper floor part of the truss falls to the lower floor.

  The present invention has been made to solve such a problem. The purpose of the present invention is to provide an upper floor side of the truss when the upper floor side support portion of the truss is out of the support position to the installation structure when an earthquake occurs. It is to provide a truss fall prevention device that prevents a portion from falling to a lower floor.

  A first feature according to an embodiment of the present invention is that the truss fall prevention device is attached to an installation structure that supports the upper floor side support portion of the truss so as to be rotatable in the vertical direction about the support shaft. A support piece that is positioned between the installation structure and the upper floor side end portion of the truss and turns the tip side upward, and a support piece that rotates to a support position that protrudes the tip side toward the truss side; A rotating means for rotating the support piece from the accommodation position to the support position when the upper floor side support part falls off the support position to the installation structure, and is attached to the support piece; An elastic member that alleviates the impact of a collision between the upper floor side support part and the support piece located at the support position when the upper floor side support part falls off the support position to the installation structure. And providing.

  A second feature according to the embodiment of the present invention is that in the truss fall prevention device, the upper floor side support portion is supported on the installation structure, and the upper floor side end portion of the truss is supported by the support shaft as a fulcrum. A housing position that is movably mounted and is positioned between the installation structure and the upper floor side end portion of the truss and has the tip side facing downward, and a support position that projects the tip side toward the installation structure And a rotating means for rotating the support piece from the accommodation position to the support position when the upper floor side support part falls off the support position to the installation structure and falls. And a support protrusion that is attached to the installation structure and is located below the support piece located at a support position, and is attached to any one of the support piece and the support protrusion, and the upper floor side support portion is When falling off the support position to the installation structure An elastic member to alleviate the impact of the collision between the support piece positioned in the support position and Holders is to comprise a.

  ADVANTAGE OF THE INVENTION According to this invention, when the upper floor side support part of a truss remove | deviates from the support position to an installation structure, it can prevent that the upper floor side part of a truss falls to a lower floor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, an escalator including a truss fall prevention device according to a first embodiment of the present invention is installed between a lower floor and an upper floor of an installation structure 1 such as a building. 2, a plurality of steps 3 connected endlessly by a chain (not shown) and circulated, a step drive mechanism (not shown) for circulating and moving the steps 3, and both sides of the step 3 It has a pair of balustrades 4 and a handrail belt 5 that wraps around the balustrade 4 and circulates.

  An upper floor side support portion 2 a is provided at the upper floor side end portion of the truss 2, and a lower floor side support portion 2 b is provided at the lower floor side end portion of the truss 2. The upper floor side support portion 2a is supported on the upper floor side of the installation structure 1, and is fixed by a structure in which the vibration of the installation structure 1 is not directly transmitted to the truss 2, for example, a structure using a long hole and a bolt. Yes. The lower floor side support portion 2b is supported on the lower floor side of the installation structure 1, and is fixed by a structure in which the vibration of the installation structure 1 is not directly transmitted to the truss 2, for example, a structure using a long hole and a bolt. Yes.

  When the upper floor side support part 2a of the truss 2 is out of the support position to the installation structure 1 between the upper floor side end of the truss 2 and the installation structure 1, A support mechanism 6 is provided for preventing the upper floor side support portion 2a of the truss 2 from falling to the lower floor. The support mechanism 6 includes a support piece 7, a coil spring 8 that is a rotating means as well as an elastic member, a pair of support fittings 9, and a support shaft 10.

  The pair of support fittings 9 is disposed at a horizontal position, and is fixed to the side surface 1 a facing the upper floor side portion of the truss 2 in the installation structure 1. A support piece 7 is attached to the support fitting 9 by a support shaft 10.

  The support piece 7 is formed in an L-shaped shape including a short piece portion 7a and a long piece portion 7b in a cross-sectional shape when a cross section is taken on a vertical plane. The support piece 7 has a short piece portion 7 a attached to the support fitting 9 by a support shaft 10, and is capable of rotating in the vertical direction around the center line of the support shaft 10.

  The support piece 7 attached so as to be rotatable in the vertical direction around the center line of the support shaft 10 is rotatable between the accommodation position shown in FIG. 2 and the support position shown in FIG. When the upper floor side support portion 2a of the truss 2 is supported by the installation structure 1, the support piece 7 is located between the installation structure 1 and the upper floor side end of the truss 2 as shown in FIG. The long piece portion 7b, which is the front end side of the support piece 7, is rotated to the storage position in which the front end side is directed upward. On the other hand, in the event of a large earthquake, when the upper floor side support portion 2a of the truss 2 deviates from the support position for the installation structure 1, the support piece 7 is located at the front end side of the support piece 7 as shown in FIG. It rotates to the support position which makes the front end side of a certain long piece part 7b project to the truss 2 side.

  One end of the coil spring 8 is fixed to the long piece 7 b of the support piece 7. The other end side of the coil spring 8 is a free end, and the contact position changes depending on the rotation position of the support piece 7. When the support piece 7 is located at the support position, the free end of the coil spring 8 is in contact with the side surface 1 a of the installation structure 1. When the truss 2 is dropped with the support piece 7 positioned at the protruding position, the free end of the coil spring 8 is brought into contact with the upper floor side support portion 2a of the truss 2. A plurality of coil springs 8 are fixed at positions along the horizontal direction, which is the lateral width direction of the support piece 7.

  When the support piece 7 is located at the accommodation position shown in FIG. 2, the other end side of the coil spring 8 having one end side fixed to the long piece portion 7 b of the support piece 7 is brought into contact with the side surface 1 a of the installation structure 1. A first abutment surface portion 7 c, which is the back side of the portion 7 b where the coil spring 8 is fixed, is in contact with the upper floor side end portion of the truss 2. In this case, the coil spring 8 is compressed, and the coil spring 8 functions as a rotation means that urges the support piece 7 in a direction (direction indicated by an arrow a) to rotate the support piece 7 to the support position.

  When the support piece 7 is located at the support position shown in FIG. 3, the second contact surface portion 7d, which is one surface of the outer peripheral surface of the short piece portion 7a, is brought into contact with the side surface 1a of the installation structure 1, and the support piece 7 is more than this. Rotation in the direction of arrow a is restricted. Further, the other end side of the coil spring 8 is in contact with the upper floor side support portion 2 a that is out of the support position for the installation structure 1.

  When the support piece 7 is located at the storage position, the projecting dimension from the installation structure 1 to the support piece 7, that is, the dimension from the side surface 1a of the installation structure 1 to the first contact surface part 7c of the long piece part 7b. Is “a”. When the support piece 7 is located at the support position, the projecting dimension from the installation structure 1 to the support piece 7, that is, the dimension from the side surface 1a of the installation structure 1 to the tip of the long piece portion 7b is “b”. The overhang dimension “b” is set larger than the overhang dimension “a”.

  In such a configuration, as shown in FIG. 1, the escalator installed in the installation structure 1 is such that the upper floor side support portion 2 a of the truss 2 is supported on the upper floor side of the installation structure 1, and A lower floor side support portion 2 b is supported on the lower floor side of the installation structure 1.

  When the upper floor side support part 2a and the lower floor side support part 2b of the truss 2 are respectively supported by the installation structure 1, they are provided between the upper floor side end of the truss 2 and the installation structure 1. As shown in FIG. 2, the support mechanism 6 is configured such that the first contact surface portion 7c of the long piece portion 7b is in contact with the upper floor side end portion of the truss 2, and one end side is fixed to the long piece portion 7b. The free end of the coil spring 8 is in contact with the side surface 1 a of the installation structure 1. For this reason, when the installation structure 1 vibrates when an earthquake occurs, the transmission of vibration from the installation structure 1 to the truss 2 is suppressed by the coil spring 8.

  When a big earthquake occurs, the upper floor side support part 2a may be out of the support position to the installation structure 1. When the upper floor side support part 2a is out of the support position to the installation structure 1, the truss 2 moves away from the installation structure 1 from the state shown in FIG. 2 and is installed with the upper floor side support part 2a. The overlapping width dimension “A” with the structure 1 gradually decreases and eventually becomes “0”.

  As the overlap width dimension “A” gradually decreases, the portion of the upper floor side end portion of the truss 2 that is in contact with the first contact surface portion 7 c is gradually separated from the support shaft 10, and the support piece 7 is connected to the coil spring 8. By the urging force, the support shaft 10 is gradually rotated in the direction of arrow a with the support shaft 10 as a fulcrum. Then, at the moment when the overlap width dimension “A” becomes “0” or just before that, the support piece 7 is greatly rotated in the direction of the arrow a, and the support piece 7 is rotated to the support position. When the support piece 7 rotates to the support position, the second contact surface portion 7d of the support piece 7 comes into contact with the side surface 1a of the installation structure 1 as shown in FIG. When the second contact surface portion 7d of the support piece 7 is in contact with the side surface 1a of the installation structure 1, the support piece 7 is further restricted from rotating in the direction of the arrow a. When the support piece 7 is rotated to the support position, the free end of the coil spring 8 is in an upward state.

  Immediately after the support piece 7 is rotated to the support position, the upper floor side support portion 2a of the truss 2 is removed from the support position for the installation structure 1, and the upper floor side portion of the truss 2 falls. However, the upper floor side support portion 2a that is out of the support position to the installation structure 1 is supported by being in contact with the free end side of the coil spring 8 fixed to the support piece 7 located at the support position. The falling dimension is reduced, and it is prevented from falling to the lower floor.

  Moreover, since the dropped upper floor side support portion 2a is brought into contact with the free end side of the coil spring 8, the impact of the collision between the upper floor side support portion 2a and the support piece 7 is alleviated.

  Further, the projecting dimension “b” of the support piece 7 rotated to the support position from the installation structure 1 is larger than the projecting dimension “a” of the support piece 7 positioned at the housing position. . For this reason, compared with the case where the support protrusion whose projecting dimension from the installation structure 1 is “a” is attached to the side surface 1a of the installation structure 1, the upper floor side support portion falls off from the support position and falls. The dimension “b” that can support 2a can be increased, and the performance of supporting the upper floor side support portion 2a that falls off the support position can be enhanced.

  Furthermore, the space secured between the installation structure 1 and the truss 2 can be set to a dimension “a” smaller than the dimension “b”, and the space for installing the escalator can be saved.

(Second Embodiment)
A truss drop prevention device according to a second embodiment of the present invention will be described with reference to FIGS. Note that, in the second embodiment and other embodiments described below, the same components as those of the previously described embodiments are denoted by the same reference numerals, and redundant descriptions are omitted.

  The truss fall prevention device according to the second embodiment is located between the upper floor side end portion of the truss 2 and the installation structure 1, and the upper floor side portion of the truss 2 is lower floor when a large earthquake occurs. It has a support mechanism 6A for preventing falling. The support mechanism 6 </ b> A includes a support piece 11, a coil spring 12 that is an elastic member, a cord-like member 13 that is a rotating means, a pair of support fittings 9, and a support shaft 10. As the cord-like member 13, a wire or a chain can be used. A recessed portion 14 is formed at a position facing the upper floor portion of the truss 2 in the installation structure 1.

  The support piece 11 is formed in a shape in which a cross-sectional shape in a cross section in a vertical plane is an I-shape. The support piece 11 is attached to the support fitting 9 by a support shaft 10 and can be rotated in the vertical direction around the center line of the support shaft 10. One end of the cord-like member 13 is connected to one end side which is the distal end side of the support piece 11, and a coil spring 12 is fixed to the other end side of the support piece 11.

  The support piece 11 attached so as to be rotatable in the vertical direction around the center line of the support shaft 10 is rotatable between the accommodation position shown in FIG. 4 and the support position shown in FIG. When the upper floor side support portion 2a of the truss 2 is supported by the installation structure 1, the support piece 11 is positioned between the installation structure 1 and the upper floor side end of the truss 2 as shown in FIG. However, the support piece 11 is rotated to the accommodation position in which the front end side is directed upward. On the other hand, in the event of a large earthquake, when the upper floor side support portion 2a of the truss 2 deviates from the support position for the installation structure 1, the support piece 11 moves the tip end side of the support piece 11 as shown in FIG. It pivots to a support position that protrudes toward the truss 2 side.

  One end side of the coil spring 12 is fixed to the other end side of the support piece 11 that is positioned with the support shaft 10 in between the tip end side of the support piece 11. The other end side of the coil spring 12 is a free end. When the support piece 11 is positioned at the support position, the free end of the coil spring 12 is positioned so as to enter the recess portion 14 and is not in contact with the inner peripheral surface of the recess portion 14. When the support piece 11 is located at the protruding position, the free end of the coil spring 12 is brought into contact with the ceiling surface 14 a of the recess 14. A plurality of coil springs 12 are fixed at positions along the horizontal direction which is the lateral width direction of the support piece 11.

  The cord-like member 13 has one end connected to the distal end side of the support piece 11 and the other end connected to the upper end side end of the truss 2. The length dimension between the connecting portions at both ends of the cord-like member 13 is such that the truss 2 moves away from the installation structure 1, and the upper floor side support portion 2 a falls off the support position to the installation structure 1. The dimensions are set such that the support piece 11 located at the accommodation position can be rotated around the support shaft 10 toward the support position immediately or immediately before dropping.

  When the support piece 11 is located at the storage position, the projecting dimension from the installation structure 1 to the support piece 11, that is, the dimension from the side surface 1 a of the installation structure 1 to the back surface portion 11 a of the support piece 11 is “a”. It is. Further, when the support piece 11 is located at the support position, the overhanging dimension from the installation structure 1 to the support piece 11, that is, the dimension from the side surface 1 a of the installation structure 1 to the front end side end face of the support piece 11 is “ b ”, and this overhang dimension“ b ”is set larger than the overhang dimension“ a ”.

  In such a configuration, when the upper floor side support part 2a and the lower floor side support part 2b (see FIG. 1) of the truss 2 are supported by the installation structure 1, the support piece 11 is shown in FIG. As shown, it is pivoted to the storage position.

  When a big earthquake occurs, the upper floor side support part 2a may be out of the support position to the installation structure 1. When the upper floor side support part 2a is out of the support position to the installation structure 1, the truss 2 moves away from the installation structure 1 from the state shown in FIG. 4 and is installed with the upper floor side support part 2a. The overlapping width dimension “A” with the structure 1 gradually decreases and eventually becomes “0”.

  As the overlapping width dimension “A” gradually decreases, the cord-like member 13 is pulled toward the upper floor side support portion 2a. Then, at the moment when the overlap width dimension “A” becomes “0” or just before that, the support piece 11 is pulled by the cord-like member 13, and the support piece 11 rotates in the direction of arrow a with the support shaft 10 as a fulcrum. Then, the support piece 11 rotates to the support position. When the support piece 11 is rotated to the support position, the free end side of the coil spring 12 is brought into contact with the ceiling surface 14 a of the recessed portion 14. When the free end of the coil spring 12 is brought into contact with the ceiling surface 14a of the recessed portion 14, the support piece 7 is restricted from further rotation in the direction of the arrow a.

  Immediately after the support piece 11 is rotated to the support position, the upper floor side support portion 2a of the truss 2 is removed from the support position to the installation structure 1, and the upper floor side portion of the truss 2 falls. However, since the upper floor side support portion 2a deviated from the support position to the installation structure 1 is supported by supporting the support piece 11 positioned at the support position, the size of the drop is reduced, and the lower floor is dropped. Is prevented.

  Moreover, when the dropped upper floor side support portion 2a comes into contact with the support piece 11, the upper floor side support portion 2a and the support piece 11 are brought into contact with the coil spring 8 by which the free end is brought into contact with the ceiling surface 14a of the hollow portion 14. The impact of the collision between is reduced.

  Further, the projecting dimension “b” of the support piece 11 rotated to the support position from the installation structure 1 is larger than the projecting dimension “a” of the support piece 11 positioned at the housing position. . For this reason, compared with the case where the support protrusion whose projecting dimension from the installation structure 1 is “a” is attached to the side surface 1a of the installation structure 1, the upper floor side support portion falls off from the support position and falls. The dimension “b” that can support 2a can be increased, and the performance of supporting the upper floor side support portion 2a that falls off the support position can be enhanced.

  Furthermore, the space secured between the installation structure 1 and the truss 2 can be set to a dimension “a” smaller than the dimension “b”, and the space for installing the escalator can be saved.

(Third embodiment)
A truss drop prevention device according to a third embodiment of the present invention will be described with reference to FIGS.

  The truss fall prevention device according to the third embodiment is located between the upper floor side end portion of the truss 2 and the installation structure 1, and the upper floor side portion of the truss 2 is lower floor when a large earthquake occurs. It has a support mechanism 6B for preventing it from falling down. The support mechanism 6B includes a support piece 7, a coil spring 8 which is an elastic member and a rotation means, a pair of support fittings 9, a support shaft 10, an H-shaped steel 15 which is a part of the installation structure, and an auxiliary member. And a spring 16. A plurality of coil springs 8 and auxiliary springs 16 are fixed to each other at positions along the horizontal direction, which is the lateral width direction of the support piece 7.

  The H-shaped steel 15 is fixed to the side surface 1 a of the installation structure 1 and is disposed at a position for supporting the upper floor side support portion 2 a of the truss 2.

  A support fitting 9 is fixed to the lower surface of the H-shaped steel 15, and a support piece 7 is attached to the support fitting 9 by a support shaft 10. The support piece 7 is formed in a shape in which the cross-sectional shape having the short piece portion 7a and the long piece portion 7b is L-shaped. The support piece 7 is attached to the support shaft 10 so as to be rotatable in the vertical direction, and rotates to the accommodation position shown in FIG. 6 and the support position shown in FIG.

  One end of the auxiliary spring 16 is fixed to the side surface 1a of the installation structure 1, and the other end is a free end. The fixing position of the auxiliary spring 16 to the side surface 1a of the installation structure 1 is such that when the support piece 7 is rotated to the support position shown in FIG. 7, the free end of the auxiliary spring 16 is the second contact surface portion 7d of the short piece portion 7a. It is set as the position which contacts.

  In such a configuration, as shown in FIG. 6, when the upper floor side support part 2 a and the lower floor side support part 2 b (see FIG. 1) of the truss 2 are respectively supported by the H-shaped steel 15, The first abutment surface portion 7c of the piece portion 7b is brought into contact with the upper floor side end portion of the truss 2, and the free end of the coil spring 8 having one end side fixed to the long piece portion 7b is brought into contact with the H-shaped steel 15. . For this reason, when the installation structure 1 vibrates when an earthquake occurs, the transmission of vibration from the H-shaped steel 15 to the truss 2 is suppressed by the coil spring 8.

  When a big earthquake occurs, the upper floor side support part 2a may be out of the support position to the H-shaped steel 15. When the upper floor side support part 2a is out of the support position to the H-shaped steel 15, the truss 2 moves away from the H-shaped steel 15 from the state shown in FIG. 6, and the upper floor side support part 2a and the H-shaped steel 15 And the overlap width dimension “A” gradually decreases and eventually becomes “0”.

  As the overlap width dimension “A” gradually decreases, the portion of the upper floor side end portion of the truss 2 that is in contact with the first contact surface portion 7c of the support piece 7 is gradually separated from the support shaft 10, and the support piece 7 Is gradually rotated in the direction of arrow a about the support shaft 10 by the urging force of the coil spring 8. Then, at the moment when the overlap width dimension “A” becomes “0” or just before that, the support piece 7 is greatly rotated in the direction of the arrow a, and the support piece 7 is rotated to the support position. When the support piece 7 rotates to the support position, the second contact surface portion 7d of the support piece 7 comes into contact with the free end side of the auxiliary spring 16 as shown in FIG. When the second contact surface portion 7 d of the support piece 7 is in contact with the free end side of the auxiliary spring 16, the support piece 7 is further restricted from rotating in the direction of the arrow a. When the support piece 7 is rotated to the support position, the free end of the coil spring 8 is in an upward state.

  Immediately after the support piece 7 is rotated to the support position, the upper floor side support portion 2a of the truss 2 is removed from the support position to the H-shaped steel 15, and the upper floor side portion of the truss 2 falls. However, the upper floor side support portion 2a that is out of the support position to the H-shaped steel 15 is supported by being in contact with the free end side of the coil spring 8 fixed to the support piece 7 positioned at the support position. The size to be reduced becomes smaller and it is prevented from falling to the lower floor.

  In addition, the impact of the collision between the upper floor support portion 2a and the support piece 7 is alleviated by the contact of the dropped upper floor support portion 2a with the free end side of the coil spring 8, and the fall. The impact acting on the support piece 7 when the upper floor side support portion 2 a abuts on the free end side of the coil spring 8 is alleviated by the auxiliary spring 16.

(Fourth embodiment)
A truss drop prevention device according to a fourth embodiment of the present invention will be described with reference to FIGS.

  The truss fall prevention device according to the fourth embodiment is located between the upper floor side end portion of the truss 2 and the installation structure 1, and the upper floor side portion of the truss 2 is lower floor when a large earthquake occurs. It has a support mechanism 6C for preventing the fall. The support mechanism 6C is provided with a plate spring 17 that functions as an elastic member and a cord-shaped member 18 that functions as a rotating means, instead of the coil spring 8 in the support mechanism 6 described in the first embodiment. Yes. As the cord-like member 18, a wire or a chain can be used.

  As shown in FIG. 10, the leaf spring 17 is attached to the long piece portion 7b of the support piece 7, both ends are fixed by a plurality of bolts 19, and the central portion is bent in a direction rising from the attachment surface 7e of the long piece portion 7b. There is.

  The cord-like member 18 has one end connected to the tip end side of the support piece 7 and the other end connected to the upper end side end of the truss 2. The length dimension between the connecting portions at both ends of the cord-like member 18 is such that the truss 2 moves away from the installation structure 1 and the upper floor side support portion 2a falls off the support position to the installation structure 1. The dimensions are set such that the support piece 7 positioned at the accommodation position can be rotated around the support shaft 10 toward the support position immediately or immediately before dropping.

  In such a configuration, when the upper floor side support part 2a and the lower floor side support part 2b (see FIG. 1) of the truss 2 are supported by the installation structure 1, the support piece 7 is shown in FIG. As shown, it is pivoted to the storage position.

  When a big earthquake occurs, the upper floor side support part 2a may be out of the support position to the installation structure 1. When the upper floor side support part 2a is out of the support position to the installation structure 1, the truss 2 moves away from the installation structure 1 from the state shown in FIG. 8 and is installed with the upper floor side support part 2a. The overlapping width dimension “A” with the structure 1 gradually decreases and eventually becomes “0”.

  As the overlapping width dimension “A” gradually decreases, the cord-like member 18 is pulled toward the upper floor side support portion 2a. The support piece 7 is pulled by the cord-like member 18 at the moment when the overlap width dimension “A” becomes “0” or just before that, and the support piece 7 rotates in the direction of arrow a with the support shaft 10 as a fulcrum. The support piece 7 rotates to the support position. When the support piece 7 rotates to the support position, the second contact surface portion 7d of the support piece 7 comes into contact with the side surface 1a of the installation structure 1 as shown in FIG. When the second contact surface portion 7d of the support piece 7 is in contact with the side surface 1a of the installation structure 1, the support piece 7 is further restricted from rotating in the direction of the arrow a. When the support piece 7 is rotated to the support position, the raised portion of the central portion of the leaf spring 17 is in an upward state.

  Immediately after the support piece 7 is rotated to the support position, the upper floor side support portion 2a of the truss 2 is removed from the support position for the installation structure 1, and the upper floor side portion of the truss 2 falls. However, the upper floor side support portion 2a deviated from the support position for the installation structure 1 is supported by being in contact with the leaf spring 17 fixed to the support piece 7 located at the support position, so that it falls. Becomes smaller and prevents falling to the lower floor.

  In addition, since the dropped upper floor side support portion 2a is brought into contact with the leaf spring 17, the impact of the collision between the upper floor side support portion 2a and the support piece 7 is alleviated.

(Fifth embodiment)
A truss drop prevention device according to a fifth embodiment of the present invention will be described with reference to FIGS.

  The truss fall prevention device according to the fifth embodiment is located between the upper floor side end portion of the truss 2 and the installation structure 1, and the upper floor side portion of the truss 2 is lower floor when a large earthquake occurs. It has a support mechanism 6D for preventing it from falling down. The support mechanism 6D includes a support piece 20, a coil spring 21 that is an elastic member, a cord-like member 22 that is a rotating means, a pair of support fittings 23, a support shaft 24, and the truss 2 in the installation structure 1. And a support protrusion 25 attached to the side surface 1a facing the upper floor side end. The pair of support fittings 23 are disposed at horizontal positions and are fixed to the upper end of the truss 2. As the cord-like member 22, a wire or a chain can be used.

  The support piece 20 is formed in a shape in which the cross-sectional shape in a vertical plane is an I-shape. The support piece 20 is attached to the support fitting 23 by a support shaft 24 and can be rotated in the vertical direction around the center line of the support shaft 24.

  The support piece 20 that can be rotated in the vertical direction around the center line of the support shaft 24 is rotatable between the accommodation position shown in FIG. 11 and the support position shown in FIG. When the upper floor side support portion 2a of the truss 2 is supported by the installation structure 1, the support piece 20 is positioned between the installation structure 1 and the upper floor side end of the truss 2 as shown in FIG. Then, it is rotated to the accommodation position in which the tip side is directed downward. On the other hand, in the event of a large earthquake, when the upper floor side support portion 2a of the truss 2 is out of the support position with respect to the installation structure 1, the support piece 20 is placed at the tip side of the installation structure 1 as shown in FIG. It pivots to a support position that protrudes to the side.

  One end side of the coil spring 21 is fixed to the front end side of the support piece 20 on the surface facing the truss 2 when the support piece 20 is rotated to the accommodation position. The other end side of the coil spring 21 is a free end. Further, one end of the cord-like member 22 is connected to the distal end side of the support piece 20. The other end of the cord-like member 22 is connected to the installation structure 1. The length dimension between the connecting portions at both ends of the cord-like member 22 is such that the truss 2 moves away from the installation structure 1, and the upper floor side support portion 2 a falls off the support position to the installation structure 1. The dimensions are set such that the support piece 20 located at the accommodation position can be rotated around the support shaft 24 toward the support position immediately or immediately before dropping.

  When the support piece 20 is rotated to the support position shown in FIG. 12, the contact surface portion 20a of the support piece 20 is brought into contact with the upper floor side end portion of the truss 2, and the support piece 20 is further rotated in the arrow b direction. To be regulated. Further, the free end of the coil spring 21 faces downward, and the free end of the coil spring 21 comes into contact with the upper surface of the support protrusion 25 when the upper floor side support portion 2a falls.

  In such a configuration, when the upper floor side support part 2a and the lower floor side support part 2b (see FIG. 1) of the truss 2 are supported by the installation structure 1, the support piece 20 is shown in FIG. As shown, it is pivoted to the storage position.

  When a big earthquake occurs, the upper floor side support part 2a may be out of the support position to the installation structure 1. When the upper floor side support part 2a is out of the support position for the installation structure 1, the truss 2 moves away from the installation structure 1 from the state shown in FIG. 11, and is installed with the upper floor side support part 2a. The overlap width dimension “A” with the structure 1 becomes “0”.

  As the overlapping width dimension “A” gradually decreases, the cord-like member 22 is pulled toward the installation structure 1 side. Then, at the moment when the overlap width dimension “A” becomes “0” or just before that, the support piece 20 is pulled by the cord-like member 22, and the support piece 20 rotates in the direction of the arrow b with the support shaft 24 as a fulcrum. The support piece 20 rotates to the support position. When the support piece 20 is rotated to the support position, the contact surface portion 20a of the support piece 20 is brought into contact with the upper floor side end portion of the truss 2 as shown in FIG. When the contact surface portion 20a of the support piece 20 is brought into contact with the upper floor side end surface of the truss 2, the support piece 20 is further restricted from rotating in the arrow b direction. When the support piece 20 is rotated to the support position, the free end of the coil spring 21 is in a downward state.

  Immediately after the support piece 20 is rotated to the support position, the upper floor side portion of the truss 2 from which the upper floor support portion 2 a is out of the support position to the installation structure 1 falls together with the support piece 20. However, since the free end of the coil spring 21 attached to the support piece 20 is supported by being abutted against the support protrusion 25, the size of the truss 2 that falls off the supporting position on the installation structure 1 is reduced. It is prevented from falling to the floor.

  In addition, since the free end of the coil spring 21 that falls together with the upper floor side support portion 2a comes into contact with the support protrusion 25, the impact of the collision between the support piece 20 and the support protrusion 25 is reduced.

  In the fifth embodiment, the case where the coil spring 21 is fixed to the support piece 20 has been described as an example, but may be fixed to the upper surface of the support protrusion 25.

  In the fifth embodiment, the case where the coil spring 21 is used as the elastic member has been described as an example. However, instead of the coil spring 21, the leaf spring 17 described in the fourth embodiment is used. Also good. In this case, the leaf spring 17 may be fixed to the support piece 20 or may be fixed to the upper surface of the support protrusion 25.

It is a side view showing the whole escalator composition provided with the truss fall prevention device concerning a 1st embodiment of the present invention. It is a side view which shows a support mechanism in case a support piece is located in an accommodation position. It is a side view which shows the support mechanism which supports the dropped truss. It is a side view which shows a support mechanism in case the support piece in the truss fall prevention apparatus which concerns on the 2nd Embodiment of this invention is located in an accommodation position. It is a side view which shows the support mechanism which supports the dropped truss. It is a side view which shows a support mechanism in case the support piece in the fall prevention device of the truss concerning the 3rd Embodiment of this invention is located in an accommodation position. It is a side view which shows the support mechanism which supports the dropped truss. It is a side view which shows a support mechanism in case the support piece in the truss fall prevention apparatus which concerns on the 4th Embodiment of this invention is located in an accommodation position. It is a side view which shows the support mechanism which supports the dropped truss. It is a front view which shows the leaf | plate spring fixed to the support piece. It is a side view which shows a support mechanism when the support piece in the fall prevention device of the truss concerning the 5th Embodiment of this invention is located in an accommodation position. It is a side view which shows the support mechanism which supports the dropped truss.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Installation structure 2 Truss 2a Upper floor side support part 7 Support piece 8 Rotating means, elastic member 10 Support shaft 11 Support piece 12 Elastic member 13 Rotating means, cord-like member 15 Installation structure 17 Elastic member 18 Rotating means , Cord-like member 20 support piece 21 elastic member 22 rotating means, cord-like member 24 support shaft 25 support projection

Claims (8)

It is attached to the installation structure that supports the upper floor side support part of the truss so that it can rotate in the vertical direction around the support shaft, and is located between the installation structure and the upper floor side end part of the truss. A support piece that pivots to a storage position that faces upward and a support position that projects the tip side toward the truss side,
A rotating means for rotating the support piece from the accommodation position to the support position when the upper floor side support part falls off the support position to the installation structure and falls;
Collision between the upper floor side support part and the support piece located at the support position when the upper floor side support part is attached to the support piece and falls off the support position to the installation structure. An elastic member that alleviates the impact of
A truss drop prevention device comprising:   2. The truss fall prevention device according to claim 1, wherein the elastic member is attached at a position where it comes into contact with the upper floor side support portion when the support piece is located at a support position.   2. The truss fall prevention device according to claim 1, wherein the elastic member is attached at a position where the elastic member comes into contact with the installation structure when the support piece is located at a support position.   The turning means and the elastic member are used together, and the turning means biases the support piece in a direction to turn the support piece to the support position when the support piece is located at the accommodation position. The truss fall prevention device according to claim 1 or 2.   The truss dropping prevention device according to claim 1 or 3, wherein the rotating means is a cord-like member connected between the support piece and the upper floor side support portion. The upper floor side support portion is attached to the upper floor side end portion of the truss supported by the installation structure so as to be rotatable in the vertical direction about the support shaft, and the upper structure side end portion of the installation structure and the truss A support piece that is positioned between and a support position that turns the tip side downward and a support position that projects the tip side toward the installation structure;
A rotating means for rotating the support piece from the accommodation position to the support position when the upper floor side support part falls off the support position to the installation structure and falls;
A support protrusion mounted on the installation structure and positioned below the support piece positioned at a support position;
The support piece that is attached to either the support piece or the support protrusion and is located at the support protrusion and the support position when the upper floor side support part falls off the support position to the installation structure. An elastic member that alleviates the impact of a collision with
A truss drop prevention device comprising:   The truss according to claim 6, wherein the elastic member is attached to the support piece, and the attachment position of the elastic member is a position that contacts the support protrusion when the support piece is located at the support position. Fall prevention device. The truss dropping prevention device according to claim 6 or 7, wherein the rotating means is a cord-like member connected between the support piece and the installation structure.

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