Hans
Knut
Hans
Knut
| 1. | Arrangement for a lubricator for wire, consisting of a cylindrical housing (1, 2) which delimits an internal pressure chamber (6) with lubricant supply (5) for lubrication of the wire (7) under pressure, and in which in the pressure chamber (6) of the housing (1, 2) are provided packings (9, 9') and in which the housing is provided with a return channel (12) for lubricant, characterized in the lubricator's housing (1, 2) being provided with a channel (10, 11, 13) for lubricant to the area close to at least the packing (9') with which the unlubricated section of the wire first makes contact. |
| 2. | Arrangement in accordance with Claim 1, characterized in the lubricant channel (13) to the first packing opening in front of it, such that the wire is lubricated before coming into contact with the first packing (9'). |
| 3. | Arrangement in accordance with Claim 1 or 2, characterized in the said channel (10, 11, 13) for lubrication of the packing or packings being provided with a regulatory device (14) by which to regulate the lubricant quantity passing into the channel for lubrication of the packing or packings. |
The present invention concerns an arrangement for a lubricator for wire of the " type stated in the introductory part of the following patent claim.
Wire is used very extensively, not least in cranes. A precondition for the use of wire is that a lubricant is added in order to ensure minimum friction against blocks and other tackle, strength, flexibility, long -service life, rust prevention and so on.
A common, though primitive lubrication method consists of applying a rag dipped in lubricant and subsequently rubbed by hand over the wire. This lubrication method is labour-intensive and ineffective, since the lubricant is only applied on the outside of the wire, without penetrating into it.
Another method of lubricating wire is to allow the wire to run beneath a feed nozzle for lubricant. The drawback with this method is that one has to use a thin (free flowing) lubricant, in addition to its providing lubrication only of a part of the wire surface. This method does not ensure penetration of lubricant into the wire either.
One further method of lubricating the wire is to use a lubricator as discussed in Norwegian Patent Appln. no. 791607, in which a lubricant is applied to a wire running through a cylinder which is a part of the lubricator. The drawback with
this lubricator is that the lubricant may be forced out of the said cylinder, even though the wire runs through containment bearings of the same diameter as the wire being lubricated. The reason is that the wire, being made up of strands, has a non- circular circumference r allowing the lubricant to escape through the openings formed between the containment packings and the wire's strands.
The said drawback with the lubricator as specified in Norwegian Patent Appln.no. 791607 is somewhat reduced by the aid of a subsequently developed packing, shaped with cutouts which conform to the wire's strands. The drawback of a lubricator equipped with such a specially shaped packing is that the packings, particularly the packing in the lubricator with which the unlubricated section of the wire first makes contact, gets worn and becomes useless within a short time due to the high friction between the packing and the wire.
The present" invention is intended to provide an arrangement for a lubricator for wire, in which effective measures have been taken to avoid excessive wear on the packings of the device, particularly the packing which first makes contact with the unlubricated section of the wire.
This intention is achieved through the characteristics stated in the following patent claim.
In the lubricator according to the invention a channel for lubrication of the packings is therefore provided, particularly the said first packing. From the pressure chamber of the device, a channel is provided which conducts the lubricant past the said first packing such that the lubricant is compressed around the wire before the wire reaches the first packing. The packing lubrication device according to the invention effectively prevents excessive wear on the packings as a result of friction between them and the wire.
One example of a device in accordance with the invention is further explained in the following with reference to the accompanying drawings, where:
Figure 1 shows an axial section through a wire lubricator with device according to the invention;
Figure 2 shows a section A-A through the lubricator in Figure 1;
The wire lubricator shown in the drawing figures includes a cylindrical housing which is divided longitudinally and consists of two parts 1 and 2 hinged together. Housing parts 1, 2 are connected by hinges 3 along their single adjoining longitudinal edges, while, along their opposite, adjoining longitudinal edges at 4 they are designed to interlock snugly. A central supply pipe 5 for lubricant leads into the lubricator's pressure chamber 6.
By means of a relative movement between the lubricator and a wire 7 which is to be lubricated, one by means of basically known pressure lubrication ensures effective lubrication of the wire, since the lubricant is also made to penetrate into the wire.
In the lubricator housing 1, 2 several bearing rings 8 are provided between which are rubber packings 9. The packing which the unlubricated part of the wire first touches is designated by reference number 9'. It is this packing 9' which is normally subject to the greatest strain and wear as a result of the friction between the wire and the packing.
In order to avoid excessive wear on the packings 9, particularly the first packing 9', as a result of the very high friction between the unlubricated section of the wire and the packings, in the housing 1, 2 of the device there is provided a longitudinal channel 10 for lubrication of the packings. This channel 10 is connected with the pressure chamber 6 of the
lubricator via a radial passage 11. A. return channel for lubricant is designated 12.
From the channel 10 for lubrication of the packings, a radial channel 13 is provided which opens in front of the packing 9 ' with which the unlubricated section of the wire first makes contact during the lubrication operation. Lubricant from this channel 13 will therefore be pressed against the wire before the wire reaches the first packing 9 ' and will thereby considerably reduce the friction between the wire and the packing. For regulation of the lubricant quantity which is supplied to the area in front of the first packing 9 ' it is possible to use, for example, a recessed socket screw 14.
With the aid of the packing lubricator according to the invention such a large reduction in friction between the wire and the packing is achieved that the packing obtains a satisfactorily long service life.
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