JPH07157265A - Safety device for passenger conveyer - Google Patents

Abstract

PURPOSE:To provide a safety device for a passenger conveyer wherein mechanical braking is performed without obstructing electrical braking in the case that a main drive shaft is recklessly rotated when a main driving gear is in abnormality. CONSTITUTION:When cutting or abnormal looseness is generated in a main drive chain 3, associated with a dropping shoe 4, a lever 5C, applying working in a circular arc shape by the same radius with a supporting point serving as the center to the point end adjacent to a switch, makes a rotating motion with a pin 6D serving as the supporting point, to perform electrical braking by actuating a microswitch 8, and a hook 10 is press attached to a main drive transmitting sprocket 2 and friction engaged. After respective through fiber washers 7A to 7D between levers 5A to 5C, the chain is fixed by pins 6A to 6D applied with working for preventing side deflection in one end or also the other end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a passenger conveyor such as an escalator or an electric road, and more particularly, to a reliable and smooth drive when a driving force transmission chain is cut or abnormally sags and causes runaway rotation. In addition, the present invention relates to a safety device for a passenger conveyor that performs electric braking safely and mechanically.

[0002]

2. Description of the Related Art Generally, a safety device for a passenger conveyor is a steplessly arranged step for carrying passengers from a lower floor to an upper floor or from an upper floor to a lower floor, and a balustrade arranged in parallel therewith. In the main drive device that drives the moving handrail that rotates synchronously with the step, between the friction plate and the braking plate of the friction braking device that prevents runaway rotation of the main drive shaft at the time of an abnormality,
An auxiliary friction plate made of a non-rust material is provided to prevent the friction plate and the braking plate from directly contacting each other, or when the driving force transmission chain is crimped and frictionally engaged to gradually stop the rotation of the driving force sprocket. Conventional techniques such as the provision of the above are disclosed and described in, for example, JP-A-58-18310 and JP-A-59-20596.

[0003]

A conventional technique for suppressing runaway rotation that occurs when an abnormality such as disconnection of the main drive chain occurs is as follows.
Since the mechanism and elements that control the mechanical braking perform only linear movement, the force concentrates on one point, and as a result, the phenomenon that the switch pushing force is not stable occurs, and it takes a lot of time to adjust the switch. Have.

Further, in the conventional mechanism for controlling mechanical braking, the mounting position of the switch is limited, so that there is a problem that the mounting workability and maintainability are deteriorated.

That is, each of the conventional techniques has a problem that the effect of braking the runaway rotation of the main drive shaft at the time of abnormality by an electric action is low and the number of maintenance steps is large.

An object of the present invention is to provide a passenger conveyor safety device equipped with an inexpensive link mechanism, which improves passenger safety in the event of an abnormality such as main drive chain disconnection, is easy to install and maintain, and is inexpensive. To do.

[0007]

According to the present invention, the above object is to provide a plurality of link mechanisms on a switch actuating piece, and to make the tips of the links adjacent to the switch arc-shaped with the same radius around a fulcrum. This is achieved by converting the motion of the link from a linear motion to a rotary motion by equalizing the force applied to the switch and by avoiding the concentration of the force on one point.

Further, the above object is achieved by providing a plurality of fulcrums of the link so that the link can be mounted at any position.

[0009] The above-mentioned object is to provide a support portion, which has one end or the other end thereof processed to prevent lateral shake, at the connecting portion constituting the link mechanism, and is fixed after interposing an elastic body between the respective elements. This is achieved by reducing the friction between the elements.

[0010]

[Operation] A plurality of link mechanisms are provided on the operation piece for operating the switch, and the tip of the link adjacent to the switch is
Make a circular arc around the fulcrum and, in addition to this, put an elastic body on the link that constitutes the link mechanism, and then fix it at one end or the other end with a support part that is processed to prevent lateral shake. By this, even if runaway rotation of the main drive shaft occurs in the event of an abnormality, the switch operates reliably, and mechanical braking is reliably and smoothly performed without interfering with electrical braking. It can be done.

Further, since the shape of the link constituting the link mechanism is simple, the manufacturing is simple and the increase in cost can be suppressed, and a plurality of link fulcrums are provided even when the mounting space is limited. , And can be mounted at any position by moving the employment, and the mounting work and the maintenance work can be performed more easily.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a passenger conveyor safety device according to the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a front view of the first embodiment of the present invention, FIG. 2 is a front view of the safety device of the first embodiment of the present invention when actuated, and FIGS. It is a figure. The illustrated embodiment shows a case in which the present invention is applied to an escalator.
Shows the main drive of the escalator located on the upper floor.

The escalator to which the present invention is applied includes a prime mover drive sprocket 1, a main drive transmission sprocket 2 located concentrically with the main drive shaft, and a main drive transmission chain 3.
Are connected endlessly, and the shoe 4 is positioned on it, and these are connected using levers 5A to 5C, pins 6A to 6D, and fiber washers 7A to 7D to form a link mechanism. The pins 6A and 6D serve as fulcrums for the levers 5A and 5C, respectively. The micro switch 8 is attached to the tip of the lever 5C and the bracket 9A.
9B, the hook 10 is arranged at the position of the rotating shaft protruding from the frame of the escalator, and the other end and one end of the lever 5A are connected by the rod 11 via the shoe 4. ing.

As shown in FIG. 2, when the main drive transmission chain 3 is cut or abnormal slack is generated, a link mechanism composed of levers 5A to 5C operates in conjunction with a shoe 4 that falls with it. Then, lever 5C is pin 6D
By performing a rotational movement with the fulcrum as a fulcrum, the micro switch 8 is operated without being destroyed and electric braking is performed, and accordingly, the hook 10 causes the main drive transmission sprocket 2 to move.
The mechanical braking is reliably and smoothly performed by being crimped to and frictionally engaged. In addition to this, the fiber washers 7A are respectively provided between the levers 5A to 5C constituting the link mechanism.
After fixing through 7D, by fixing with pins 6A to 6D that are processed to prevent lateral shake at one end or the other end, friction between levers 5A to 5C can be reduced, further improving safety. You can

Further, by changing the lever ratio of the levers 5A to 5C, adjusting the mounting positions of the brackets 9A to 9B, and moving the fulcrum positions of the pins 6A and 6D as desired, It is possible to set the mounting position of the micro switch 8, and also to set the initial position and the initial angle of the hook 10 by adjusting the length of the rod 11, so that the mounting work and maintenance work can be easily performed. I can.

Although the present invention has been described as being applied to an escalator, the present invention can also be applied to an electric road or the like.

[0018]

According to the present invention, even when an abnormality such as a break in the main driving force transmission chain occurs, the runaway rotation of the main driving shaft can be reliably and smoothly braked, so that it is safe for passengers. Therefore, it is possible to provide a safety device for a passenger conveyor that can improve the installation cost, can easily perform the mounting work and the maintenance work, and can reduce the cost.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a front view of the passenger conveyor safety device according to the first embodiment of the present invention during operation.

FIG. 3 is a sectional view of a main part of FIG.

FIG. 4 is a sectional view of a main part of FIG.

5 is an explanatory view of a switch adjacent portion of the lever in FIG.

[Explanation of symbols]

1 ... Motor drive sprocket, 2 ... Main drive transmission sprocket, 3 ... Main drive transmission chain, 4 ... Shoe, 5A, 5
B, 5C ... Lever, 6A, 6B, 6C, 6D ... Pin, 7
A, 7B, 7C, 7D ... Fiber washer, 8 ... Micro switch, 9A, 9B ... Bracket, 10 ... Hook,
11 ... Rod.

Claims (6)

[Claims] 1. A plurality of steps for carrying passengers from a lower floor to an upper floor or from the upper floor to the lower floor are provided on a step chain provided on both sides of the step chain, and the step chain is wound around a main drive gear. In a passenger conveyor in which a sprocket is fixed coaxially with the main drive gear, and a chain is wound between the sprocket and a prime mover sprocket, a brake of a friction braking device that normally prevents runaway rotation of the main drive shaft. And the tooth tips of the sprocket are arranged with a predetermined interval, and when the chain is broken or the like, a plurality of link mechanisms are provided on the switch operating piece so that the tips of the links adjacent to the switch are the same centered around the fulcrum. By performing processing in a circular arc with a radius, the movement of the link is converted from a linear movement to a rotary movement, the main power source is cut off by the link, and electric braking is performed. By frictional engagement caused the during crimping of the braking element and sprockets, the safety device of a passenger conveyor and having a structure for performing mechanical braking. 2. A passenger conveyor safety device according to claim 1, wherein a plurality of fulcrums of links forming the link mechanism are provided. 3. The support according to claim 1, wherein one end of a support portion that connects the links forming the link mechanism, or
A safety device for passenger conveyors that has been processed to prevent lateral shake at the other end. 4. The safety device for a passenger conveyor according to claim 1, 2 or 3, wherein elements of the links constituting the link mechanism are connected via an elastic body. 5. The safety device for a passenger conveyor according to claim 1, 2, 3 or 4, wherein the tip of the link adjacent to the switch is processed into an arc shape with the same radius centered on a fulcrum. 6. The method according to claim 1, 2, 3, 4 or 5.
Passengers having a structure in which a single fulcrum and a plurality of fulcrums constituting the link mechanism are located on the employment supporting them and the fulcrum can be moved in any direction by moving the employment. Conveyor safety device.