DE1243612B - Hydraulic front cap - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

E21d

German: 5 c- 17/04

Number: 1243 612

File number: H 59771VT a / 5 c

Filing date: June 25, 1966

Opened on: July 6, 1967

The invention relates to a pre-pledging cap which can be advanced hydraulically from a carrier cap and has a front end of the carrier cap and arranged at the rear end of the Vorpfändkappe ramp wedges and a support bolt for the pre-pledging cap.

It is known to have hydraulically extendable telescopic caps on the caps of striding expansion teams or to attach hydraulically pivoting flap caps in order to achieve a pre-seizure, whereby the actual caps become the carrier cap of this pre-pledged cap.

Hydraulically extendable telescopic pre-pledging caps have, even if they have a certain pivoting movement allow the disadvantage that once with the bumps that are always present in the hanging wall The swivel range usually does not allow the proper support of the roof layers to be underpinned, on the other hand, the predominant effective support force exerted by the tip of the pre-pledged cap The number of cases is insufficient for a perfect mastery of the roof layers. The linear ones Pre-pledging caps often cannot be extended at all, even in the case of severe unevenness in the hanging wall or only by screwing in the stamp or loosening the carrier cap.

With hinged caps, a greater hydraulic support force can be achieved on the hinged part. However, you have to provide a relatively large pressure in the cylinder, which is also due to an additional Overpressure valve is secured in order to avoid overloads if the hanging pressure is too high. In addition, the absolute tightness of the cylinder must be guaranteed. The protection by a pressure relief valve requires a construction that is not rigid. Such caps therefore require requirements and conditions that not only require additional effort, but are also susceptible to failure and repairs mean.

The present invention is based on the object of designing a telescopic pre-pledging cap in such a way that that they can be moved in any position along their entire extension path by swiveling or bending the Vorpfändkappenprofils in the actual support cap with the hanging wall is frictional locked, absorbs the bending moment and can be easily released under full load to then to be able to be braced again in the next working position.

The solution to this problem has surprisingly been achieved by, according to the invention, in the interior of the pre-pledging cap a reversible sliding element is arranged to which the piston rod of the hydraulic cylinder-hydraulic Pledge cap

Applicant:

Hoesch Bergbautechnik G. mb H.,
Dortmund, Leuthardstr. 1-5

Named as inventor:

Dr.-Ing. Klaus Spies, Dortmund-Wellinghofen;

Walter Weirich, Dortmund

this is hinged on the front side in the pre-pledging direction and that at the rear end one to the front Has rising cam track, while at the rear end of the Vorpfändkappe above the cam track a vertically movable tension lock is arranged, for the bracing of which the inner surface of the carrier cap serves as an abutment. Furthermore, according to the invention, there is a resilient one on the pre-pledging cap Element provided that when this cap is fully extended this with the sliding element in the retraction direction connects positively.

The interaction between the cam track and tension lock is done in such a way that the Withdrawal movement of the hydraulic cylinder, the tension lock - controlled via the cam track - Presses against the inner surface of the carrier cap and when the cylinder moves forward, the The tension lock releases again by lowering the sliding element.

As a resilient element for the form-fitting connection is in particular according to a further feature of the invention at the rear end of the pre-pledging cap a hairpin-shaped spring with a Z-shaped bent free end attached, the reaches through a recess when the spring when advancing the Vorpfändkappe over a Taper bolt is tightened. The sliding element is provided with a finger at its end, which can be used when moving back the same engages in the tensioned spring and couples the pre-pledging cap with the sliding element. Through this connection, the sliding element is moved into the starting position without actuating the toggle fastener the pre-pledging cap.

There are ramp wedges on both sides at the front end of the carrier cap and at the rear end of the pre-pledging cap arranged, with which the pre-pledging cap is clamped in the end position. At the front end A support bolt is arranged on the support cap and is provided to support the pre-pledging cap.

7C9 609/61

Claims (2)

The pre-pledging cap swivels around this bolt when the tension lock is tensioned. The toggle fastener is hinged to the pre-pledged cap via tabs. The cap according to the invention works in such a way that it is extended and tensioned in the pilgrim step and this effect is achieved at any point of its extension length. Due to the bias in the support cap, the support bolt is used as a pivot point and the extended part of the pre-pledging cap is pressed towards the hanging wall, the counterforce being diverted vertically upwards via the tension lock on the support cap. This mode of operation results in a pivoting movement of the pre-pledged cap corresponding to the height of the cap profile. When the pre-pledging cap runs into its end position on the wedges, a tension inevitably occurs, which when retracting the pre-pledging cap has such an effect that the clamping lock of the pre-pledging cap is locked, the same is not actuated and thus the pre-pledging cap is retracted. It is obvious that in this way still further advantages can be achieved, as they have been achieved with the swivel cap described above, namely high pressure absorption, relief of the cylinder, thus eliminating special seals, pressure relief valves and the like Advantage that joints and rockers are saved on the Vorpfändprofil the cap. Their number is already reduced and, if necessary, they are protected inside the caps. An embodiment of the invention will be described with reference to the drawing. 1 shows a carrier cap with the pre-pledging cap in the initial state as a longitudinal section, FIG. 2 the pre-pledging cap according to B-B of FIG. 6, fig. 3 the pre-pledging cap according to C-C of FIG. 6, fig. 4 the cap according to D-D of FIG. 5, Fig. 5 the Vorpfändkappe fully extended and with tensioned ramp wedges in longitudinal section, F i g. 6 the Vorpfändkappe partially extended and tensioned, in section, Fi g. 7 Detail "A" of FIG. 4 on an enlarged scale, the actuation and action of the detent spring, F i g. 8 the pre-pledging cap in the clamped end position according to E-E of FIG. 4. In the front part of the carrier cap 1, which is designed in the usual way to be placed on the heads of the clamping ram, the pre-pledging cap 2 is housed. It is advanced by means of the hydraulic cylinder 3, which is hinged to the support cap 1 at the bearing point 4. In the pre-pledging cap 2, a sliding member 5 is provided, to which the piston rod 3 α of the hydraulic cylinder 3 is articulated via a bolt 6 and which has a cam track 5 a at the other end. The Vorpfändkappe 2 has a limiting bolt 7 as a stop for the sliding element 5 at the front. At the other end, the tension lock 8 is hinged via a tab 9. Furthermore, a hairpin-shaped spring 10 with a Z-shaped bent free end 10 α is riveted, which grips through a recess 11 when a conical bolt 12 is reached and under which a finger 13 of the sliding member 5 can grip. At the front end of the carrier cap 1 there is also a support bolt 14 for supporting the pre-pledged cap 2. Furthermore, wedge pieces 15 are attached to the pre-pledged cap 2 and 16 on the carrier cap. The mode of operation is explained in FIGS. 4 to 8. The cylinder 3 pushes the Vorpfändkappe 2 before the slide member 5 when it extends, where de: tension lock is exposed, the tab 9 is on the cure venbahnbeginn. If the sliding element 5 is then withdrawn to the stroke "α", the clamping connection 8 is then activated according to FIG. 6 pressed against the inner surface of the carrier cap 1. If the end position is reached when extending, the wedges 15 and 16 clamp the Vorpfändkappe 2 At the same time, the spring is pressed by the taper pin 12: inward, and the finger 13 of the sliding organ 5 engages when retracting. Sliding element i and pre-pledging cap 2 are coupled, the clamping mechanism cannot take effect and is only released again when the starting position has been reached and a new extension begins. Patent claims: 1. Hydraulically from a carrier cap in front of the sliding pre-pledging cap with at the front End of the carrier cap and at the rear end de: Pre-pledging cap arranged ramp wedges and a support bolt for the pre-pledging cap characterized in that a reversible slide inside the pre-pledging cap (2) organ (5) is arranged to which the piston rod (3 α) of the hydraulic cylinder (3) ai the front side is hinged in Vorpf ändrichtung and the one at the rear end of rising cam track (5 a) has, true at the rear end of the Vorpfändkappe (2) above the cam track (5 a) a vertically movable tension lock (8) is arranged for its Bracing the inner surface of the support cap (1) serves as an abutment, and that to dei Vorpfändkappe (2) a resilient element is provided, the diesel when fully extended Cap this connects positively with the sliding element (5) in the retraction direction. 2. Vorpfändkappe according to claim 1, characterized in that the resilient element füi the positive connection of cap and sliding element (5) a hairpin-shaped spring (10] is attached with a Z-shaped bent end (10 a) which reaches through a recess (11), if a taper bolt (12) is attached to the carrier cap when the pre-pledged cap is pushed forward is reached, and that a finger (13) is provided on the sliding element (5 '), which when moving back of the sliding element via the free end of the spring sliding element and pre-pledging cap 3. Vorpfändkappe according to claims] and 2, characterized in that the front At the end of the support cap (1) a support bolt (14) is arranged which supports the pre-pledging cap (2 ' .bears and bends. 4. Vorpfändkappe according to claims 1 to 3, characterized in that the clamping closure (8) is hinged to the pre-pledging cap via a tab (9). Considered publications: German publication No. 1200234. 1 sheet of drawings 709 609/61 6.67 © Bundesdruckerei Berlin