DE1083886B - Locking head for connecting oil-filled cables - Google Patents

Description

The main patent 1063240 refers to one Locking head for connecting oil-filled cables, consisting of a chamber with elastic walls, which engages over the cable end, which is characterized in that the walls with a reinforcement part are made of metal. This locking head is pushed over the cable ends to be connected, to prevent oil leakage from the cable during the connection process or so far decrease as possible.

In order to have access to the oil in the elastic chamber after the connection has been completed Housing, which usually encloses the finished connection to create, a valve is provided that can be operated from the outside of the housing.

According to the main patent, this valve is inserted into a wall of the elastic chamber. For this purpose, a larger opening is made in the reinforcement part than in the chamber wall. Thus, the chamber wall in the vicinity of the valve lacks the support of the reinforcement part. Such an arrangement is sufficient to withstand oil pressures which generally occur when connecting oil-filled cables, ie pressures up to approximately 2.8 kg / cm ² . If this pressure is exceeded, however, then there is a tendency for the elastic material from which the chamber is made to stretch to such an extent that the valve can be pushed out of the chamber wall, especially if it is rubber or a similar easily stretchable material , with the risk of tearing the chamber wall. The invention serves to overcome this disadvantage.

According to the invention is in the closure head for connecting oil-filled cables according to the main patent 1 063 240, consisting of a chamber overlapping the cable end with elastic walls, which are connected to a reinforcement part made of metal are provided, the valve through which the connection between the Chamber interior and the outside is produced, both in the chamber wall and in the Reinforcement part attached. This is achieved in that the opening in the reinforcement part so is reduced so that the reinforcement part as well as the chamber wall tightly encloses the valve.

To illustrate the invention, an embodiment of the invention is described with reference to the drawing, which shows a longitudinal section of a bolt head. The chamber 1 of the closure head made of elastic material has a sleeve 2 which surrounds the end of the cable jacket 3 and is fastened to it with the aid of metal clips 4. The chamber 1 can also be attached to its counter-locking head
for connecting oil-filled cables

Addendum to patent 1,063,240

Applicant:

Pirelli-General Cable Works Limited,
London

Representative:

Dipl.-Ing. G. Weinhausen, patent attorney,
Munich 22, Widenmayerstr. 46

Claimed priority:
Great Britain 9 March 1959

Frederick John Miranda, Chandlers Ford, Hants,
and Edmund Hugh Ball, Southampton, Hants

(Great Britain),
have been named as inventors

overlying side be provided with cuffs 5, which are used in a known manner to encompass a corresponding number of cable cores, not shown in the drawing. The chamber 1 is enveloped by a reinforcement part 6, whereby undesired expansion or bulging due to the internal oil pressure is avoided. In general, the bolt head is enclosed by a housing 7 which is attached after the connection has been completed. In order to establish a connection between the chamber 1 and the housing 7 or to introduce oil from the outside through a filler neck 8, as it is usually provided, a valve is used in the chamber 1, which consists of a pipe part 9 with a flange 10 is connected and has an internal thread so that a grub screw 11 can be screwed up to a seat 12. The valve tube 9 is fastened in the wall openings of the elastic chamber 1 and the reinforcement part 6 with the aid of a cup-shaped washer 13 which presses on the outside of the reinforcement part 6 and is provided with teeth along its inner edge,

009 547/290

which dig into the surface of the valve tube 9, as it is known as a salt compound. The valve is used in such a way that it is pushed through the openings of the chamber 1 and the reinforcement part 6 from the inside until the flange 10 rests on the inner surface of the chamber. It is then fastened in that one pushes the Salter connection 13 over the valve tube 9 until it rests on the outer surface of the reinforcement part, the fastening disc being held in place by the aforementioned inner tooth wreath.

In a further exemplary embodiment, the valve tube 9 can be provided with an external thread and is fastened with the help of a nut which lies against the reinforcement part 6. A third attachment option provides a groove in the outer wall of the valve tube 9. The valve tube will then held in the groove by means of a snap ring which rests against the reinforcement part 6.

In those cases where the elastic chamber 1 is circular or has other outlines, as in FIG As a sectional view is shown, it is advantageous to place on it and the corresponding part of the reinforcement part 6 to form a flat surface, whereby a better seating of the flange 10 and the sinter connection 13 is reached.

If desired, the valve tube 9 can be flattened along its tube wall, and the openings in the chamber 1 and the reinforcement part 6 can have corresponding outlines, so that a rotation of the valve tube in these openings is prevented. To operate the valve is the grub screw 11 provided with a square recess so that it can be turned with a correspondingly shaped key 14 can be. The key is preferably magnetic to the grub screw 11, which is made of magnetic Material is to be pulled upwards after it has been unscrewed from the thread of the valve tube 9 became.

Due to the fact that the opening of the reinforcement part 6, through which the valve tube 9 is passed, has the same dimensions as the valve tube and this on the reinforcement part 6 with the aid of the salt connection 13 or a corresponding device is attached, the possibility is avoided that the valve due to excessive pressure in the chamber 1 is driven out, because the chamber wall is, also immediately around the valve, through the Reinforcement part adequately supported.

Claims (6)

Patent claims: 1. Locking head for connecting oil-filled cables according to main patent 1063 240, consisting of a chamber with elastic walls that crosses the cable end and is provided with a reinforcement part made of metal, characterized in that a valve (9) through which the connection is established between the outside and inside of the chamber, both in the chamber wall (1) as is also fixed in the reinforcement part (6). 2. Closure head according to claim 1, characterized in that the chamber wall and the reinforcing part are provided with concentric openings through which the valve is inserted, and that both the wall of the chamber and the reinforcement part fit tightly around the valve. 3. Closure head according to claim 2, characterized in that the valve consists of a valve tube (9) with a flange (10) which rests against the inner wall of the chamber and with fastening means (13) is provided, which are supported against the outer surface of the reinforcement part, as well as that the size and outline of the openings in the chamber wall and in the reinforcement part are the same those of the pipe outer wall. 4. Closure head according to claim 3, characterized in that the outer wall of the valve tube is flattened and the openings in the chamber wall and reinforcement part accordingly are trained. 5. Closure head according to claim 2, 3 and 4, characterized in that the valve tube (9) is a Has internal thread and is equipped with a grub screw (11) that extends up to a seat (12) in the valve tube can be screwed, and that the grub screw has a square recess has, which is used to receive a correspondingly shaped key (14) with which it rotated can be. 6. Closure head according to claim 5, characterized in that the grub screw is made of magnetic Material is made and the key is made magnetic to take out the screw to be able to. 1 sheet of drawings © 009 547/290 6.60