DE8521604U1 - Guide shoe for elevators - Google Patents

Description

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Oberhausen 11, 25.07.1985 PLD right-be GM 42

Ruhfchemle ... Ak.tIjengesej 1schaft> Oberhausen 11 Guide shoe for elevators

The present invention relates to a device for guiding elevator cars of elevators on guide rails *

Elevator guide shoes are located on the side of the elevator car and are used to guide it safely and stably on the running or guide rails, the guide shoes consist of the retaining shoe »a metal housing and a sliding insert fastened therein, which is designed in a U-shape is, the running rail is on 3 sides and slides on the rail. The sliding insert has crucial Influence on the ride comfort of the elevator. It is required to have excellent lubricity, low Frictional resistance, possibly also without lubrication, high abrasion resistance and chemical resistance against lubricants. In addition, she should be elastic in order to compensate for shock loads caused by irregularities in the guide rails, e.g. misalignments and to dampen any noises and vibrations that occur while driving.

The connection between the sliding insert and the retaining shoe is made by protruding cams. You are on the the side of the sliding insert facing away from the sliding surface. The cams snap into the corresponding holes in the holding shoe a and are firmly, but detachably connected to this.

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The inlays are made of various materials. ZiB _ä Asbestos and especially thermoplastics * They include polyamides, polyacetals and polyurethanes. Recently, ultra-high molecular weight polyethylene has been used increasingly for the manufacture of sliding inserts. This is understood to mean polyethylene types with a viscometrically measured molecular weight of at least 500,000, but preferably more than 1 million. It is obtained by low-pressure polymerisation of ethylene using the Ziegler process and can be processed into blocks and plates by means of pressing technology, from which finished parts can then be produced, for example by machining. In addition to pressing, UHMW-PE can also be processed by extrusion (ζ * Β * frame extrusion) and injection molding. ,>

Ultra-high molecular weight polyethylene is characterized by particularly good sliding properties. The material is particularly suitable for sliding, dry friction against metals like steel, brass or copper self-lubricating. Its favorable dry running properties are to be emphasized. Therefore, the U-shaped inserts made of ultra-high molecular weight polyethylene, which slide on the running rail, are against Impurities such as dust or sand are insensitive.

In addition, ultra-high molecular weight polyethylene is very robust against wear. Its abrasion when sliding on metals is very low. This one, for your use The relatively low noise attenuation is particularly favorable behavior as sliding inserts in retaining shoes opposite to. Grinding noises that occur during

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and through the ultra-high molecular weight polyethylene are not mitigated, have the consequence that the traveling speed of the elevator car in general not more than 1.2 m / sec. can be increased. Find guide shoes and insoles made of ultra-high molecular weight polyethylene therefore mainly used in hydraulic and freight elevators.

In contrast to the sliding inserts made of polyethylene '■ • Polyurethane sliding inserts have a high static friction torque when starting the car as well as high coefficients of sliding friction. To improve the sliding properties oil lubrication is therefore essential. The overall moderate sliding behavior of polyurethane sliding inserts contrasts with the very good noise insulation of the material. It allows you to use the cabs too to move at high speeds, i.e. at speeds> 1.6 m / sec, without causing noise pollution.

It was therefore the task to develop guide shoes for elevators with high resistance to wear and excellent sliding properties, also have optimal noise-dampening behavior.

The invention relates to a guide shoe for elevators, which consists of a holding shoe and a U-shaped cross-section

² ^ mig designed, with the holding shoe firmly but detachably connected slide insert, which comprises a running rail on 3 sides. It is characterized in that the sliding insert connected to the retaining shoe consists of ultra-high molecular weight polyethylene, the sides of which, facing away from the sliding surface, are covered with a layer of an elastomer.

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The term elastomers is understood to mean plastics whose plastic behavior is similar to that of the Is similar to natural rubber. They include butadiene copolymers such as butadiene-styrene and S butadiene-acrylonitrile polymer, 1,4-polyisoprene, Polychloroprene and polyurethanes. To produce the sliding inserts for training shoes, the prefabricated Core made of ultra high molecular weight polyethylene in an injection mold with the elastomer overmoulded. The resulting connection between polyethylene and the elastomer is strong and durable.

The mechanical connection of the two components of the sliding insert can be improved by the polyethylene core with longitudinal and transverse recesses in the form of deep grooves or notches or notches e.g. in the form of a dovetail profile, in which the elastomer layer is anchored will. It has proven particularly useful, d'e recesses in the polyethylene core not perpendicular to its surface cut, but at an angle other than 90 °. This way the mechanical Anchoring the elastomer layer on the polyethylene body further improved.

A connection between polyethylene and the elastomer can also be done with the help of adhesion promoters. These substances make it possible to be without glue, the connection of different materials. This connection is usually established at elevated temperature and with the application of elevated pressure. This way of working, however, is tight

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There are limits as there are only a few adhesives that create a durable bond between the polyethylene and the elastomer. Examples of suitable adhesion promoters are hot melt adhesives based on polyethylene copolymers.

Polyurethane-based elastomers have proven particularly useful as elastomers in the context of the invention. From the A large number of known polyurethanes are expediently selected from elastomeric types which, due to their properties, especially their high elasticity, excellent damping capacity both against mechanical Have influences such as impact processes as well as driving noises.

The thickness of the elastomer layer on the polyethylene core is to be adapted to the respective circumstances. she is chosen so that the required elastic-resilient and dampening behavior is achieved.

The protruding cams attached to the sliding insert for anchoring are preferably circular or oval shape. They can either be integrated into the polyethylene core, then consist of polyethylene and are covered with the elastomer layer. But it is also possible to make them exclusively from the elastomer form, so not preform them in the polyethylene core.

Figure 1 shows the sliding insert of a guide shoe in cross section. A polyethylene core 1 is on three sides surrounded by an elastomer layer 2 which is anchored in the polyethylene core 1 by incisions 3. the

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The sliding insert is detachably connected to the retaining shoe with cams 4.

Figure 2 shows the sliding insert in longitudinal section. A The polyethylene core 5 is made of an elastomer layer 6 surrounded, which is anchored by incisions 3 in the polyethylene core. Cams 4 are used for the connection the sliding insert with the retaining shoe.

Finally, FIG. 3 shows a holding shoe with a sliding insert 10. Guide shoe shown.

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Claims (7)

ISIL 1.) Guide shoe for elevators, which consists of a holding shoe and a U-shaped cross-section, with the Holding shoe firmly, but releasably connected sliding insert consists, which comprises a running rail on 3 sides, thereby characterized in that the sliding insert connected to the holding shoe is made of ultra-high molecular weight polyethylene consists, the sides facing away from the sliding surface with a layer of an elastomer umhül It sine 2.) Guide shoe according to claim 1, characterized in that the sliding insert made of ultra high molecular weight.-n polyethylene with a viscometrically measured molecular weight of at least 1 million. 3.) Guide shoe according to claim 1 and 2, characterized in that that the sides of the sliding insert facing away from the sliding surface are covered with a layer of elastomeric polyurethane are wrapped. 4.) Guide shoe according to claim 1 to 3, characterized in that the polyethylene core with the sliding insert Longitudinal and transverse recesses are provided. 5.) Guide shoe according to claim 4, characterized in that the recesses form an angle other than ^{90 0 C with the surface of the polyethylene core.} It suffered if t Il Il I I t t It III III Il I I · I I IM I III i * »* tt * I * I t ι i It * * ItII * ■ t · ·· * tttt II · 1 · ·· » - 2 - GH 42 6.) Guide shoe according to claim 1 to 5, characterized in that the polyethylene rail and the elastomer layer are connected with the help of an adhesion promoter. 7.) Guide shoe according to claim 6, characterized in that the adhesion promoter is based on a hot melt adhesive of polyethylene copolymer.