WO2024069935A1

WO2024069935A1 - Elevator car top handrail device

Info

Publication number: WO2024069935A1
Application number: PCT/JP2022/036716
Authority: WO
Inventors: 智貴仮屋; 勝博島田; 康司伊藤
Original assignee: 株式会社日立製作所
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2024-04-04

Abstract

This elevator car top handrail device is provided with a left-side handrail, a right-side handrail, and a rear handrail. The rear handrail is provided with a joint portion in which a left-side rear handrail member and a right-side rear handrail member are connected with each other. The joint portion: is provided with an engagement pin provided on one of the left-side rear handrail member and the right-side rear handrail member, and an engagement groove provided on the other; and connects the left-side rear handrail member and the right-side rear handrail member with each other by engaging the engagement pin with the engagement groove. The engagement groove has a first groove portion where the engaging/releasing of the engagement pin can be performed and a second groove portion that is formed continuously with the first groove portion. The second groove portion receives the engagement pin when a downward force has been applied to the joint portion and maintains the joint state between the left-side rear handrail member and the right-side rear handrail member.

Description

Elevator car handrail device

The present invention relates to an elevator car handrail device.

　Workers who perform maintenance and inspections on elevators often work from on top of the elevator car. For this reason, elevator cars are equipped with handrails on top of the car to ensure the safety of workers.

As an example of this type of prior art, Patent Document 1 describes an elevator car handrail device that includes a left handrail located on the left side as viewed from the elevator landing side, a right handrail located on the right side as viewed from the elevator landing side, and a rear handrail connecting the left handrail and right handrail.

In the car handrail device described in Patent Document 1, the rear handrail is composed of a left rear handrail member and a right rear handrail member, and the left rear handrail member and the right rear handrail member are connected by a connecting plate having a groove. In addition, a pair of clamping plates that regulate the front-to-rear movement of the left rear handrail member and the right rear handrail member are attached to the left rear handrail member, and a pair of regulating plates that regulate the up-down movement of the left rear handrail member and the right rear handrail member are attached to the right rear handrail member. In addition, a connecting plate is rotatably attached to the left rear handrail member, and a wing bolt is attached to the right rear handrail member. In the car handrail device described in Patent Document 1, the connecting plate is rotated in a vertical plane, a wing bolt is inserted into the groove, and the wing bolt is tightened in this state, thereby regulating the movement of the left rear handrail member and the right rear handrail member.

JP 2014-1073 A

However, in the car handrail device described in Patent Document 1, in order to connect the left rear handrail member and the right rear handrail member, it is necessary to attach a pair of clamping plates, a pair of regulating plates, and a rotatable connecting plate to the rear handrail. This makes the structure for connecting the left rear handrail member and the right rear handrail member complicated. Also, in the car handrail device described in Patent Document 1, if a downward force is applied to the right rear handrail member, for example by an operator leaning against the rear handrail, there is a risk that the wing bolt will come out of the groove and the connection between the left rear handrail member and the right rear handrail member will be released.

The object of the present invention is to provide an elevator car handrail device that has a simple structure for connecting the left rear handrail member and the right rear handrail member, and that can reliably maintain the connection between the left rear handrail member and the right rear handrail member even when a downward force is applied to the connection between the left rear handrail member and the right rear handrail member.

In order to solve the above problems, for example, the configurations described in the claims are adopted.
The present application includes a number of means for solving the above problems, one of which is an elevator car handrail device that includes a left handrail disposed on the left side as viewed from the elevator landing side, a right handrail disposed on the right side as viewed from the elevator landing side, and a rear handrail connecting the left handrail and the right handrail. The rear handrail includes a left rear handrail member attached to the left handrail, a right rear handrail member attached to the right handrail, and a connecting portion that connects the left rear handrail member and the right rear handrail member. The connecting portion includes an engagement pin provided on one of the left rear handrail member and the right rear handrail member, and an engagement groove provided on the other, and connects the left rear handrail member and the right rear handrail member by engaging the engagement pin with the engagement groove. The engagement groove includes a first groove portion that can engage and disengage the engagement pin, and a second groove portion formed continuously with the first groove portion. The second groove portion receives the engagement pin when a downward force is applied to the connecting portion, thereby maintaining the connected state of the left rear handrail member and the right rear handrail member.

ADVANTAGE OF THE PRESENT DISCLOSURE According to the present invention, it is possible to provide an elevator car handrail device which has a simple structure for connecting the left rear handrail member and the right rear handrail member, and which can reliably maintain the connected state of the left rear handrail member and the right rear handrail member even when a downward force is applied to the connection part of the left rear handrail member and the right rear handrail member.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

1 is a schematic diagram showing the overall configuration of an elevator according to this embodiment. FIG. 1 is a perspective view showing an elevator car handrail device according to an embodiment of the present invention in an unfolded state. FIG. 2 is a perspective view showing the elevator car handrail device according to the present embodiment in a folded state. FIG. 11 is a cross-sectional view showing the configuration of a pivot point portion at the connection between the upper right handrail member of the right handrail and the right rear handrail member of the rear handrail. This is a view of the connecting portion of the rear handrail as seen from the V direction in Figure 2. 6 is a cross-sectional view of the connecting portion in FIG. 5 taken along the line VI-VI. 7 is a cross-sectional view of the connecting portion shown in FIG. 5 along line VII-VII. FIG. 4 is a cross-sectional view showing the attached state of a thumbscrew. FIG. 4 is an enlarged view of a portion of the connecting bracket. FIG. 11 is a diagram (part 1) illustrating the procedure for connecting the left rear handrail member and the right rear handrail member. FIG. 2 is a diagram (part 2) illustrating the procedure for connecting the left rear handrail member and the right rear handrail member. 13A and 13B are diagrams illustrating a state in which a downward force is applied to a connecting portion.

Below, an embodiment of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, elements having substantially the same functions or configurations are given the same reference numerals, and duplicated descriptions will be omitted.

FIG. 1 is a schematic diagram showing the overall configuration of an elevator according to this embodiment.
As shown in Fig. 1, the elevator 10 includes a car 30 that moves up and down in a hoistway 12, and a car handrail device 50 arranged above the car 30. The hoistway 12 is formed so as to penetrate a building 8 in the vertical direction. The elevator 10 is a passenger transport device that loads passengers into the car 30 from a landing 24 on each floor, raises and lowers the car 30 within the hoistway 12 in response to requests from the passengers, and lands the car 30 at the desired landing 24 to let the passengers off.

A machine room 14 is provided at the top of the elevator shaft 12. A hoist 16 and a control device 18 are installed in the machine room 14. The hoist 16 winds up the main rope 20 in a predetermined direction by a predetermined amount under the control of the control device 18. One end of the main rope 20 is connected to the car 30, and the other end of the main rope 20 is connected to a counterweight 22. The counterweight 22 is a weight for reducing the load on the hoist 16. The car handrail device 50 is a device for ensuring the safety of the worker 6 when the worker 6 performs maintenance and inspection work on the elevator 10 in the work area above the car. The car handrail device 50 is configured to be foldable.

Fig. 2 is a perspective view showing the elevator car handrail device of this embodiment in an unfolded state. Fig. 3 is a perspective view showing the elevator car handrail device of this embodiment in a folded state. Note that Fig. 2 shows the car handrail device as viewed from the rear side of the car, and Fig. 3 shows the car handrail device as viewed from the front side of the car.

As shown in Figures 2 and 3, the car handrail device 50 comprises a left handrail 51 located on the left side as viewed from the landing 24 side of the elevator 10 shown in Figure 1, a right handrail 52 located on the right side as viewed from the landing 24 side, and a rear handrail 53 connecting the left handrail 51 and the right handrail 52. The rear handrail 53 is located on the rear side as viewed from the landing 24 side (the rear side of the car 30). The car handrail device 50 is preferably made of metal members to ensure the strength necessary to ensure the safety of the worker 6.

The left handrail 51 has a two-tiered structure, an upper one and an lower one. Specifically, the left handrail 51 comprises an upper left handrail member 511, a lower left handrail member 512, and a pair of support members 513. The upper left handrail member 511 is attached to the end of the support member 513 (the upper end when unfolded). The lower left handrail member 512 is attached to the support member 513 with an appropriate gap between it and the upper left handrail member 511. The upper left handrail member 511 and the lower left handrail member 512 are each made of hollow square timber. Furthermore, the upper left handrail member 511 and the lower left handrail member 512 are arranged parallel to each other.

The pair of support members 513 are members that support the upper left handrail member 511 and the lower left handrail member 512 when they are connected. The pair of support members 513 are attached to corresponding

collapsible support parts

514, 515. Furthermore, each of the pair of support members 513 is made of a hollow round material.

The

support parts

514, 515 have

corresponding hinge parts

514a, 515a, respectively, and the

hinge parts

514a, 515a can be used to switch between a state in which the pair of support members 513 is upright as shown in FIG. 2 and a state in which the pair of support members 513 is laid down as shown in FIG. 3. The

support parts

514, 515 are each fixed to the upper part of the car 30 (for example, the upper frame of the car 30) using bolts or the like.

The support section 514 is equipped with a locking member 514b that holds the pair of support members 513 in an upright position. The locking member 514b is provided so as to be slidable in the longitudinal direction of the support members 513. The locking member 514b slides downward under its own weight when the left handrail 51 is upright, thereby preventing the pair of support members 513 from falling over. When lowering the left handrail 51, the worker 6 must slide the locking member 514b upward. The configuration and operation of the support section 514 equipped with the locking member 514b are also described in the above-mentioned Patent Document 1.

The right handrail 52, like the left handrail 51 described above, has a two-tiered structure with an upper and lower section. Specifically, the right handrail 52 comprises an upper right handrail member 521, a lower right handrail member 522, and a pair of support members 523. The upper right handrail member 521 is attached to the end of the support member 523 (the upper end when unfolded). The lower right handrail member 522 is attached to the support member 523 with an appropriate gap between it and the upper right handrail member 521. The upper right handrail member 521 and the lower right handrail member 522 are each made of hollow square timber. The upper right handrail member 521 and the lower right handrail member 522 are also arranged parallel to each other.

The pair of support members 523 are members that support the upper right handrail member 521 and the lower right handrail member 522 when they are connected. The pair of support members 523 are attached to corresponding

collapsible support parts

514, 515. The pair of support members 523 are each made of hollow round material. The basic structure of the

support parts

514, 515 is as described above.

The rear handrail 53 comprises a left rear handrail member 531 located on the left side when viewed from the landing 24 side of the elevator 10, a right rear handrail member 532 located on the right side when viewed from the landing 24 side, and a connecting portion 533 (Figure 2) that connects the left rear handrail member 531 and the right rear handrail member 532. The connecting portion 533 is located in the middle part of the longitudinal direction of the rear handrail 53. The left rear handrail member 531 is a long member with an L-shaped cross section. The base end of the left rear handrail member 531 is attached to the upper left handrail member 511 of the left handrail 51. The left rear handrail member 531 is attached so as to be rotatable around the pivot portion 535. The right rear handrail member 532 is a long member with an L-shaped cross section. The base end of the right rear handrail member 532 is attached to the upper right handrail member 521 of the right handrail 52. The right rear handrail member 532 is attached so that it can rotate around a pivot point 536 (FIG. 2). The configuration of the pivot point 536 is basically the same as the configuration of the pivot point 535 described above. For this reason, in this specification, only the configuration of the pivot point 536 will be described in detail using FIG. 4.

FIG. 4 is a cross-sectional view showing the configuration of a pivot point at the connection between the upper right handrail member of the right handrail and the right rear handrail member of the rear handrail.
4, the pivot point 536 includes a bolt 537, a pair of washers 538, a collar 539, and a nut 540. The screw shaft 537a of the bolt 537 is inserted into a through hole 532a provided in the right rear handrail member 532 and a through hole 521a provided in the right upper handrail member 521. The screw shaft 537a of the bolt 537 is also inserted into a pair of washers 538 and the collar 539.

Of the pair of washers 538, the upper washer 538 is placed between the head 537b of the bolt 537 and the right rear handrail member 532, and the lower washer 538 is placed between the upper edge of the left rear handrail member 531 and the nut 540. The collar 539 is placed between the right rear handrail member 532 and the upper edge of the right upper handrail member 521. The nut 540 is placed below the upper edge of the right upper handrail member 521. The nut 540 meshes with the screw shaft 537a of the bolt 537.
In the pivot point portion 536 having the above-mentioned configuration, the right rear handrail member 532 is supported so as to be freely rotatable around the screw shaft 537 a of the bolt 537 .

Fig. 5 is a view of the connecting portion of the rear handrail as viewed from the V direction in Fig. 2. Fig. 6 is a VI-VI cross-sectional view of the connecting portion in Fig. 5, and Fig. 7 is a VII-VII cross-sectional view of the connecting portion in Fig. 5.
As shown in Figs. 5 to 7, the connecting portion 533 has a connecting bracket 541. The connecting bracket 541 is a member having the same cross-sectional shape (L-shape) as the left rear handrail member 531. The connecting bracket 541 is fixed to the left rear handrail member 531 using two bolts 542 and two nuts 543 (Fig. 6). A pair of washers 544 is attached to the threaded shaft 542a of the bolt 542. The pair of washers 544 are arranged in a state in which they sandwich the connecting bracket 541 and the left rear handrail member 531 in the central axial direction of the bolt 542. The nut 543 meshes with the threaded shaft 542a of the bolt 542. The connecting bracket 541 is fixed to the left rear handrail member 531 by the tightening force of the bolt 542 and the nut 543.

The connecting bracket 541 is also formed with two engagement grooves 545. In contrast, two wing screws 546 are attached to the right rear handrail member 532. The engagement grooves 545 are arranged on the opposite side of the longitudinal direction of the connecting bracket 541 to the position where the connecting bracket 541 is fixed by the bolt 542 and nut 543. The engagement grooves 545 will be explained in detail later. The threaded portion 546a of the wing screw 546 (Figures 7 and 8) engages with the screw hole 532b provided in the right rear handrail member 532. The threaded portion 546a of the wing screw 546 corresponds to the engagement pin.

FIG. 9 is an enlarged view of a portion of the connecting bracket.
As shown in FIG. 9, two engagement grooves 545 are formed in the connecting bracket 541, with the positions shifted in the longitudinal direction of the connecting bracket 541 (the left-right direction in FIG. 9). The engagement groove 545 has a first groove portion 545a and a second groove portion 545b. The first groove portion 545a and the second groove portion 545b are formed in an inverted L shape in a state where they are continuous (connected) with each other. The first groove portion 545a is formed along the short side direction of the connecting bracket 541 (the up-down direction in FIG. 9). The second groove portion 545b is formed along the longitudinal direction of the connecting bracket 541. In other words, the first groove portion 545a and the second groove portion 545b are formed in a direction that forms a right angle with each other.

The first groove 545a is a groove that can engage and disengage the threaded portion 546a of the wing screw 546. A chamfered portion 545c is formed at the entrance of the first groove 545a to make it easier to insert and remove the threaded portion 546a of the wing screw 546. The second groove 545b is formed in a bent state from the rear end of the first groove 545a. The rear end of the first groove 545a refers to the end opposite the entrance of the first groove 545a described above. The second groove 545b is a groove that receives the threaded portion 546a of the wing screw 546 to maintain the connection state of the left rear handrail member 531 and the right rear handrail member 532 when a downward force is applied to the connection portion 533 when the left rear handrail member 531 and the right rear handrail member 532 are connected by the connection portion 533 as shown in FIG. 2.

Next, a method of using the elevator car handrail device according to this embodiment will be described. Here, it is assumed that the work is performed by a worker 6 using the car handrail device 50. There is no restriction on the number of workers 6.

When unfolding the car handrail device 50 folded as shown in FIG. 3, the worker 6 first raises the left handrail 51 and the right handrail 52. At that time, the locking member 514b of the support part 514 slides under its own weight, thereby keeping the left handrail 51 and the right handrail 52 in the raised state. The locking member 514b may be slid manually by the worker 6.

Next, the worker 6 rotates the left rear handrail member 531 around the pivot fulcrum 535, and rotates the right rear handrail member 532 around the pivot fulcrum 536. As a result, the left rear handrail member 531 is positioned at a right angle to the upper left handrail member 511. The right rear handrail member 532 is positioned at a right angle to the upper right handrail member 521.

Next, the worker 6 connects the left rear handrail member 531 and the right rear handrail member 532. The procedure for this will be explained using Figures 10 and 11. Note that Figure 10 shows the car handrail device 50 as seen from the rear side of the car 30. Also, for ease of explanation, Figure 11 shows only the threaded portion 546a of the thumbscrew 546.

First, as shown in FIG. 10, worker 6 uses hinge

parts

514a, 515a of supports 514, 515 (only support part 514 is shown in FIG. 10) as the axis of rotation to slightly spread left handrail 51 and right handrail 52 outward. At this time, worker 6 positions connecting bracket 541 attached to the tip of left rear handrail member 531 slightly above the tip of right rear handrail member 532.

Then, as shown in Figures 11A and 11B, the worker 6 places the connecting bracket 541 over the tip of the right rear handrail member 532. At this time, the worker 6 crosses the tip of the right rear handrail member 532 and the connecting bracket 541 while aligning the threaded portion 546a of the thumbscrew 546 with the engagement groove 545 of the connecting bracket 541. As a result, as shown in Figure 11C, the threaded portion 546a of the thumbscrew 546 is inserted into the first groove portion 545a of the engagement groove 545. Then, when the left rear handrail member 531 and the right rear handrail member 532 are positioned horizontally, as shown in Figure 11D, the threaded portion 546a of the thumbscrew 546 is inserted all the way to the far end of the first groove portion 545a. Next, the worker 6 tightens the two thumbscrews 546 to fix the connecting bracket 541 to the right rear handrail member 532. As a result, the left rear handrail member 531 and the right rear handrail member 532 are connected by the connecting part 533. Also, the car handrail device 50 is in the unfolded state as shown in FIG. 2.

Then, worker 6 performs maintenance and inspection of elevator 10, and when maintenance and inspection is completed, folds car handrail device 50 by reversing the above procedure before normal operation of elevator 10. When folding car handrail device 50, worker 6 loosens two thumbscrews 546 and then lifts up connecting part 533. This causes threaded part 546a of thumbscrew 546 to disengage from first groove part 545a of engagement groove 545. This allows left rear handrail member 531 and right rear handrail member 532 to be easily separated.

Now, consider the case where a worker 6 performing maintenance and inspection work on the car 30 leans against the rear handrail 53, for example, and a load is applied from above to the connecting part 533. In this case, a downward force F is applied to the connecting part 533 of the rear handrail 53, as shown in FIG. 12. Therefore, the left rear handrail member 531 and the right rear handrail member 532 bend so as to open outward (left and right) from each other. At this time, within the engagement groove 545 of the connecting bracket 541, as shown in FIG. 12, the threaded part 546a of the wing screw 546 moves from the first groove part 545a to the second groove part 545b. In other words, the second groove part 545b receives the threaded part 546a. As a result, the threaded part 546a is hooked into the second groove part 545b. Therefore, the connection state between the left rear handrail member 531 and the right rear handrail member 532 is maintained. Therefore, even if a downward force F is applied to the connecting portion 533 of the rear handrail 53, there is no risk of the connection between the left rear handrail member 531 and the right rear handrail member 532 being released.

In the elevator car handrail device 50 according to this embodiment, the left rear handrail member 531 and the right rear handrail member 532 can be connected by engaging the threaded portion 546a of the wing screw 546 attached to the right rear handrail member 532 with the engagement groove 545 of the connection bracket 541 attached to the left rear handrail member 531. This simplifies the structure for connecting the left rear handrail member 531 and the right rear handrail member 532. In addition, when a downward force is applied to the connection portion 533 of the rear handrail 53, the threaded portion 546a of the wing screw 546 moves from the first groove portion 545a to the second groove portion 545b within the engagement groove 545, thereby maintaining the engagement state of the threaded portion 546a and the engagement groove 545. This ensures that the connection state of the left rear handrail member 531 and the right rear handrail member 532 can be reliably maintained. Therefore, a car handrail device 50 with high safety can be provided at a low cost.

In addition, in this embodiment, the connecting bracket 541 is fixed to the left rear handrail member 531, and an engagement groove 545 is formed in this connecting bracket 541. This allows the left rear handrail member 531 and the right rear handrail member 532 to be constructed from common parts. Incidentally, the engagement groove 545 can also be formed in the left rear handrail member 531. In that case, however, it is necessary to widen the tip of the left rear handrail member 531 by the plate thickness of the right rear handrail member 532 so that when the left rear handrail member 531 is placed over the right rear handrail member 532, the heights of both members are the same. For this reason, the left rear handrail member 531 and the right rear handrail member 532 are constructed from separate parts.

In addition, in this embodiment, a wing screw 546 having a threaded portion 546a and an engagement groove 545 into which the wing screw 546 engages are provided at multiple positions (two in this embodiment) on the rear handrail 53, offset from one another in the longitudinal direction. This allows the left rear handrail member 531 and the right rear handrail member 532 to be connected in a more stable state.

In addition, in this embodiment, the engagement pin is formed by the threaded portion 546a of the wing screw 546. As a result, if the engagement pin were formed by a round pin or the like, a separate member would be required to secure the left rear handrail member 531 and the right rear handrail member 532 to each other; however, with this embodiment, the left rear handrail member 531 and the right rear handrail member 532 can be secured to each other by the simple task of simply tightening the wing screw 546. Furthermore, even if the wing screw 546 is not sufficiently tightened, the engagement between the threaded portion 546a and the engagement groove 545 allows the left rear handrail member 531 and the right rear handrail member 532 to remain connected.

The present invention is not limited to the above-described embodiments, but includes various modified examples. For example, the above-described embodiments are described in detail to make the contents of the present invention easier to understand, but the present invention is not necessarily limited to having all of the configurations described in the above-described embodiments. It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete part of the configuration of each embodiment, add other configurations, or replace it with other configurations.

For example, in the above embodiment, the left handrail 51 and the right handrail 52 each have a two-tier structure with an upper and lower tier, and the rear handrail 53 has a single tier structure with only an upper tier, but the present invention is not limited to this, and the number of tiers of each of the left handrail 51, right handrail 52, and rear handrail 53 can be changed as necessary.

In addition, in the above embodiment, the connecting bracket 541 is fixed to the left rear handrail member 531, and the wing screw 546 is attached to the right rear handrail member 532, but the present invention is not limited to this, and the connecting bracket 541 may be fixed to the right rear handrail member 532, and the wing screw 546 may be attached to the left rear handrail member 531.

The engagement pin may also be made of a material other than the thumbscrew 546.

10...Elevator, 24...Landing, 50...Car handrail device, 51...Left handrail, 52...Right handrail, 53...Rear handrail, 531...Left rear handrail member, 532...Right rear handrail member, 533...Connecting part, 541...Connecting bracket, 545...Engagement groove, 545a...First groove, 545b...Second groove, 546...Thumb screw, 546a...Threaded part (engagement pin)

Claims

An elevator car handrail device comprising: a left handrail disposed on the left side as viewed from the elevator hall side; a right handrail disposed on the right side as viewed from the elevator hall side; and a rear handrail connecting the left handrail and the right handrail,
The rear handrail includes a left rear handrail member attached to the left handrail, a right rear handrail member attached to the right handrail, and a connecting portion connecting the left rear handrail member and the right rear handrail member,
The connecting portion includes an engagement pin provided on one of the left rear handrail member and the right rear handrail member, and an engagement groove provided on the other of the left rear handrail member and the right rear handrail member, and connects the left rear handrail member and the right rear handrail member by engaging the engagement pin with the engagement groove,
The engagement groove has a first groove portion capable of engaging and disengaging the engagement pin, and a second groove portion formed continuously with the first groove portion,
an engaging pin disposed in the second groove portion when a downward force is applied to the connecting portion, and the engaging pin is engaged with the left rear handrail member and the right rear handrail member to maintain the connected state of the left rear handrail member and the right rear handrail member;
The connecting portion has a connecting bracket fixed to the left rear handrail member or the right rear handrail member,
The elevator car handrail device according to claim 1, wherein the engagement groove is formed in the connecting bracket.
The elevator car handrail device according to claim 1, wherein a plurality of the engagement pins and a plurality of the engagement grooves are provided at different positions in the longitudinal direction of the rear handrail.
The elevator car handrail device according to claim 1, wherein the engagement pin is formed by a threaded portion of a thumbscrew.