DE1091645B - Device for inserting a flexible steel wire spiral for inserting wires into electrical conduits - Google Patents

Description

FEDERAL REPUBILIC OF GERMANY

JtIlL

GERMAN MM & k PATENT OFFICE

kl. 21c 18/01

INTERNAT. KL. H 02 g

EDITORIAL NOTICE 1091645

L28026VIIId / 21e

REGISTRATION DAY:

NOTIFICATION OF THE REGISTRATION AND ISSUE OF THE
EDITORIAL: OCTOBER 27, 1960

The invention relates to a device for the rotating insertion of a steel wire spiral into electrical conduits and pulling the wires into them. There are procedures for inserting intake spirals or tapes in electrical conduit are known. Devices operating according to known methods have a very complicated electric drive device with an extensive gear drive for moving a steel belt. These devices are therefore so> comfortable very complicated in their structure and also prone to failure and of course also very expensive. A Another known device works with a friction disc made of rubber, over which the retracted Spiral is running. It is pressed against the friction disc by an adjustable pressure roller. The friction disc has an inclined position to the pressure roller. When the friction disc is rotated therefore not only a further conveyance of the spiral to be drawn in, but also a turning movement the same. If the spiral to be inserted is only pushed in its longitudinal direction, then Difficulties occur: when moving further, when the tip of the spiral comes to a bend. If, however, the spiral turns 'SO', this curvature is easily overcome without further ado. This However, the device has the disadvantage that the friction rubber roll wears out quickly and that with a greater length of the spiral to be inserted and especially but with many curvatures the frictional force of the friction roller is no longer sufficient, so that the the spiral to be inserted begins to slip. Slipping also occurs when the spiral being inserted is greasy or is oily. Finally, this device also has it the disadvantage that with it you can not pull out the spiral at the other end of the tube .. This is only possible by hand. However, the beginning of the spiral is deformed because it is pulled by hand Loops must be formed. It is also a device in the manner of the subject of the invention for insertion a flexible steel wire spiral for inserting electrical wires into electrical conduits known; it consists of a hollow cylindrical handle, a clamping head and a holder of the device on the pipe serving mouthpiece and a sleeve in which the steel wire spiral is guided, wherein the handle and the sleeve are coaxially arranged, the handle against the sleeve axially displaceable and the clamping head can be actuated by the handle, with the steel wire spiral holding clamping pieces in the clamping head for clamping the steel wire spiral during insertion. This device also has the disadvantage that the steel wire spiral cannot be turned, unless the fitter has the device a piece with device for insertion

a flexible steel wire spiral

for inserting wires

in electrical conduits

Applicant:

German Academy of Sciences in Berlin, Berlin-Adlershof, Rudower Chaussee 116-125

Gustav Lay; Blumberg (Bad.), has been named as the inventor

moves the wire away from the conduit, partially rotating it. So it is at least necessary that

the further pushing is interrupted, but this means a ¹ loss of time. Furthermore, there is in the device due to the insufficient guidance of the spiral in _; Clamping head there is a risk that the spiral will bend in the case of greater resistance in the tube in the clamping head.

which additionally increase the resistance and also damage the spiral itself.

The invention relates to such a device for inserting a flexible steel wire spiral for a

Insertion of wires into electrical conduit. It consists of a hollow cylindrical handle, a clamping head, a mouthpiece which is used to hold the device on the conduit pipe, and a Sleeve in which the steel wire spiral is guided,

whereby the handle and the sleeve are arranged coaxially, the handle axially against the sleeve. slidable and the clamping head can be operated by the handle, with the steel wire spiral during the Inserting the clamping pieces in the clamping

head.

The invention has now set itself the task of improving a device of this type so that the described Disadvantages are eliminated. It is achieved according to the invention in that the grip head with the grip

one with this firmly connected and the. Sleeve overlapping first tube with two spiral, on the outer circumferential surface of the tube provided grooves is rotatably mounted that with the mouthpiece a second tube protruding into the handle

009 629/331

is connected, within the part of the second tube lying in the handle at the end of the same and opposite the mouthpiece a bearing for the first tube is arranged and / in the bearing two in the Sliding grooves and thus twisting of the clamping head and the when moving the handle first tube and thus also the steel wire spiral causing bolts are arranged.

An embodiment of the device according to the invention is shown by Figs. It shows

Fig. 1 the device in section,

Fig. 2 the clamping head of the device (section along line AA),

Fig. 3 a section along the line BB,

Fig. 4 shows a section through the mouthpiece along the line CC.

The device works as follows: The steel wire spiral 25 is pushed through the device from the release button 7 pushed through until it emerges at part 18. The protruding steel wire spiral goes into the electrical Line pipe inserted until part 18 hits the line pipe or the junction box.

The electrician holds the mouthpiece against the electrical conduit with one hand and moves it with the other hand pumping the handle 1, 2 back and forth (similar to a bicycle pump). When withdrawing of the handle from the mouthpiece, the knurled eccentric rollers 13 slide over the steel wire spiral. When the handle is pushed forward onto the mouthpiece, the eccentric rollers 13 tension automatically By means of the springs 12, the intake spiral 25 is fixed and it is pushed into the conduit pipe a maximum of 150 mm per stroke into it. Since the clamping head is rotatably mounted in the handle via the balls 24 and into the Twist spindles 9 'two opposing spiral grooves (pitch 16 °) are milled in when piercing the twist spindle 9 by twist nut 15 and the bolts 16 a rotating movement on the intake spiral transfer. By the release button 7, the eccentric rollers 13 can counter the force of the Springs 12 are twisted in order to ensure easy insertion of the steel wire spiral 25.

The eccentric lever 20 in the mouthpiece locks the intake spiral against retreating when it is withdrawn of the handle. This blocking can be done at any time by turning the eccentric lever 20 against the compression spring 21 can be solved. Likewise, the eccentric rollers 13 when the sleeve 7 is pressed against the springs 6 can be lifted off the spiral 25. With these two unlocks it is possible to open the spiral 25 can be pushed through the device from both sides at any time. This ensures that the device not only for the rotating insertion of the intake spiral into the pipes, but also for the subsequent Pulling in the wires can be used as a pulling device by pulling the steel spiral in the reversed device introduces and with the attached wires through the electrical conduit can pull through.

When pulling out the steel wire spiral, it is possible with this device to stop at the same place to be able to. The steel wire spiral is only pulled a little bit out of the pipe, whereupon then the device is moved on the steel wire spiral against the pipe and then the Steel wire spiral is pulled back. Furthermore, with him a retraction of the steel wire spiral when the handle is withdrawn automatically by the eccentric lever built into the mouthpiece prevented. In the subject matter of the invention, if there is still little resistance to insertion there is almost no rotation of the steel wire spiral. With increasing resistance, however, the . Rotation stronger and stronger. So if the resistance is so great that there is no further pushing for a moment, If necessary, the steel wire spiral also rotates on the spot, so that a safe guarantee is given, that shortly afterwards the steel wire spiral can be pushed further. By unrolling the steel wire spiral If there are a large number of bends in the conduit, the frictional resistances are created reduced to a minimum by the rotating movement of the spiral. When the steel wire spiral hits in a sharp arc, the resistance is overcome by turning and sliding. Since the Most of the electrical conduits are covered on the inside with an insulating jacket, as is the case with the one now recently used flexible tube has an extremely rough inner surface, these strong resistances, which inevitably occur inside the pipe can only be eliminated by adding the steel wire spiral is introduced rotating, which is achieved by the device according to the invention.

Claims (4)

Patent claims: 1. Device for inserting a flexible steel wire spiral for inserting wires into electrical conduits, consisting of a hollow cylindrical handle, a clamping head, a mouthpiece to hold the device on the conduit pipe and a sleeve in which the steel wire spiral is guided, whereby the handle and the sleeve are coaxially arranged, the handle can be axially displaced against the sleeve and the clamping head can be actuated by the handle with clamping pieces in the clamping head holding the steel wire spiral during insertion, characterized in that in the handle (Ij 2 and 4) the clamping head (10) with one with this firmly connected and the sleeve (22) overlapping first tube (9) with two spiral, on the outer surface of the tube (9) provided grooves (26) is rotatably mounted that with the mouthpiece (18) into the handle (1, 2 and 4) protruding second tube (23) is firmly connected, wherein within the handle (1,2 and 4) the lying part of the second tube (23) at the end of the same and opposite the mouthpiece (18) a bearing (15) is arranged for the first tube (9) and sliding in the bearing (15) comprises two grooves (26) and thus during the displacement of the handle (I ₁ 2 and 4) rotation of the clamping head (10 ) and the first tube (9) and thus also the steel wire spiral causing bolts (16) are arranged. 2. Apparatus according to claim 1, characterized in that three eccentrics roll as clamping pieces (13) are provided, which are held in a known manner by a spring (12) in their clamping position are. , 3. Apparatus according to claim 1 and 2, characterized in that that the clamping head (10) on the one hand in a the handle (I, 2 and 4) terminating Lid (4) and on the other hand in a support wall (3) arranged in the handle (1, 2 and 4) in balls (24) is stored. 4. Apparatus according to claim 1 to 3, characterized in that the cover (4) has one on this resiliently attached and through this ι uyi 040 protruding release button (7) for moving the contact surfaces of the eccentric rollers (13) from the Device axis before passing the steel wire spiral (25) through the device or before inserting it the steel wire spiral (25) at the end of the handle for the purpose of pulling the steel wire spiral (25) and in the mouthpiece (18) a resilient (21) connected to this, the steel wire spiral when inserting the handle that does not attack and when moving in the opposite direction (1, 2 and 4) acting, known eccentric levers (20, 21) are provided. Considered publications:
German Patent No. 855 422;
USA. Patent Nos. 2,729,424, 1,761,592. 1 sheet of drawings