Spring rope pulleys for sliding lift doors

The ideal closing device to meet the EN 81, point 7.7.3.2

Characteristics

  • According to EN 81-1/2 point 7.7.3.2. all landing doors driven by the car door have to be equipped with an additional mechanical closing device. This has to ensure the automatic closing of the landing door when it is open, for whatever reason, and the car is outside the unlocking zone.
  • An ideal solution to this problem represent the new models of the DICTATOR spring rope pulley with plastic casing. Due to guide grooves for the plastic cable injected in the casing and an optimized bearing of the spring in the casing, they offer a very long operational life and an optimum functioning.
  • Using a plastic casing and a plastic cable also minimizes noise emission.

Product details

Technical data

Materialcasing: flame retardant DOMAMID plastics; rope: flame retardant Kevlar rope with polyester coat
Closing force25 N; 50 N; 80 N
Type of doorssliding doors

Models

  • Spring rope pulley with hub for fixing with an 8 mm square bolt (to be procured by the customer) or a screw with square neck (DIN 603) (by customers). For this model we supply a mounting bracket (part no. 070113), see dimensioned drawing further down.
  • Spring rope pulley with sliding hub: this prevents the possible damaging of the spring during tensioning or releasing. The spring rope pulley with sliding hub always comes together with a bracket (zinc-plated or AISI 304). Mounting on the wall or ceiling becomes much more easier when fixing the bracket to the separately available mounting plate with headless pins (part no. 070114).

For an optimum functioning of the spring rope pulley the door has to be as smooth-running that the force of the mounted spring rope pulley is sufficient to move the door from every position. If you are not sure, we recommend you measure the force required to move the door with a spring balance. It is possible to adjust the force of the spring rope pulley by varying its pretension – see the instructions under “Mounting”.

Closing force

Adjusting the Closing Force of Spring Rope Pulleys with Sliding Hub

On both sides of the spring rope pulley is a tensioning screw (wrench size 17). Turning it in the direction of arrow increases the pretension, turning against the direction of arrow reduces the pretension. Thanks to the integrated sliding hub, there is no risk of damaging the spring in case of an error during tensioning.

Adjusting the Closing Force of Spring Rope Pulleys with Inner Square

When pretensioning the spring rope pulley make sure not to release the rope by accident. In this case the spring would unwind in an uncontrolled way and thus get damaged.

First the spring rope pulley is fixed on the square. Then it is pretensioned either by pulling the rope or by turning it manually in the direction of arrow. Don’t pretension the spring too much as unwinding spring rope pulleys without sliding hub is possible only with the greatest care.

Closing Force/Travel of Spring Rope Pulley

The closing force can be adapted by pretensioning the spring rope pulley. The higher the pretension of the spring, the shorter, however, is the remaining travel. The maximum possible travel with the respective spring force (pretension) can be found in the adjoining diagram.

Example: Spring rope pulley with 50 N, pretension 2 revolutions
The final closing force of the spring rope pulley (when the door is closed) will be approx. 38 N, the maximum possible travel is 1.05 meters. If the spring rope pulley is pretensioned less you get a longer travel, but the final closing force will be minor.

Dimensions

All dimensions in mm

Spring rope pulley with inner square

The inner square of the spring rope pulley is end-to-end. In fact the entry on both sides is staggered by exactly 90° and thus procures a safe seat for a square bolt provided on site or the square bolt of the mounting bracket.

Spring rope pulley with mounting bracket

Part no. 070113

The mounting bracket makes mounting of the spring rope pulley much easier if there is no square bolt provided on site. If required, the mounting bracket has to be ordered in addition to the spring rope pulley.

Spring rope pulley with sliding hub and bracket

Mounting plate for spring rope pulley with sliding hub

Part no. 070114

If the spring rope pulley has to be fixed to the wall or ceiling, we recommend to use this mounting plate. You simply have to fit the spring rope pulley to the headless pins of the mounting plate and then screw the mounting plate to the wall/ceiling.

Installation

Installation notes

The adjoining photos show a DICTATOR spring rope pulley on a Meiller sliding landing lift door, door being closed and open.

Order information

Order Information

DescriptionPart No.
Spring rope pulley 80 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket AISI 304070099
Spring rope pulley 50 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket AISI 304070098
Spring rope pulley 25 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket AISI 304070103
Spring rope pulley 80 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket zinc-plated070094
Spring rope pulley 50 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket zinc-plated070093
Spring rope pulley 25 N with 2 m plastic rope, plastic casing with guide grooves, with sliding hub, bracket zinc-plated070102
Spring rope pulley 80 N with 2 m plastic rope, plastic casing with guide grooves, for through square 8 x 8 x 26 mm070112
Spring rope pulley 50 N with 2 m plastic rope, plastic casing with guide grooves, for through square 8 x 8 x 26 mm070111
Spring rope pulley 25 N with 2 m plastic rope, plastic casing with guide grooves, for through square 8 x 8 x 26 mm070110

Accessories

DescriptionPart No.
Mounting plate for spring rope pulleys with sliding hub (25/50/80 N), zinc-plated, 150 x 35 x 3 mm070114
Mounting bracket for spring rope pulley with through square, zinc-plated, with cup square screw and washers070113