US2729945A - Mine filling frame structure comprising props and pivotally connected girders - Google Patents

Description

2,729,945 COMPRISING D GIRDERS 2 Sheets-Sheet.

Filed Feb. 28 1950 FEGJ,

INVENTOR. KARL GERLAGH flan. W, 'iQEfi G \LACH zfi rfifi fi MINE FILLING FRAM TRUCTURE COMPRISING PROPS AND PIVOTALLY CONNECTED GIRD ERS 2 Sheets-Sheet 2 Filed Feb. 28 1950 INVENTDR. KARL GERLAQH MINEFILLING United States Patent 2, 19, 45 FRAME STRUCTURE, COMPRISING.

PROPSAND PIVOT'AIEEY CONNECT-El) uineas KarLGs lach, M e stLower Rhine), lan pali a qnlf h uary 3 95058? 1N 1. .,9 lt5. (llaimstpr iority, application Germany March 9, 1949. 3 Claims. ((31. 61-.-.45)

h nve tion e ates to m n fil i g ame struc ures,

Pat is lhr y far work rmiue ompr ins p p l girders, in which, the, girders are pivotally connected at their interengagingends. More in. particular, the inventionrelates to filling structures; ofthis type in which the individual ginders are in the form of shortprofile sections which;1 are; at; first connectedwith. the preceding girders and freely carried by them and then, as the wonkingprogresses, supported by one or more, props, In this. manner the joints which connect the individual girders, are. subjected to great; leads by the mountain-pressure, especially when pressure bears down on the long lever arm, formed by the girder which is at first. freely carried.

in the mine filling frame. structures; known. heretofore, the jointsof the girders were usually connected by pivot; belts which were inserted. through bores in theinterengaga i g; ends; 01? the girders. This arrangement-was disadvan.-.

fi fi l s. hh htl e; th ores Which received the pivot bolts entailed a weakening ofthe girder profilessespecially at theI endangered. cross-sectional. areas and i also. because. the pivot bolts had to be as strong as. possible inorden to. with: stand the loads bearing down upon them. The use of pivot bolts had the further disadvantage that they made the robbing on withdrawing ofithe girder sections difficult because this work made ifnecessary to remove alsothe pivot bolts, which was frequently very difiicultiunder the effects of the mountain-pressure.

In accordance with the teaching of: the invention, all of, these disadvantages can be avpided, in a mine filling frame structure having pivotally connected girdeps inthat the ends of the girders are made to pivotally interengage by means of projections and recesses, by connecting them with each other, for example, by interengaging extension pieces. In all cases it may be eflicacious for the purpose, to form the joints constituted by the interengaging projection pieces in a manner that they are open at the bottom.

In this and similar ways it is possible, by means of the invention to provide a mine filling framework having pivotally connected girders, in which a special pivot bolt with all its disadvantages is avoided, in that the ends of the girder sections are formed in such a manner that they constitute a pivot joint. If in this or a similar manner the invention makes it possible to avoid a pivot bolt as a special member, it is also possible to eliminate all the disadvantages which heretofore arose in connection with the robbing of the mine, in that the girder section which is to be withdrawn disengages itself at the end from the pivot joint with the adjacent girder end when the supporting prop is loosened and a certain small displacement movement is executed.

A pivotal connection of girder sections is known in which an open hook engages a pivot bolt welded to the bottom side of the other girder end so that this girder can freely drop when the associated prop is removed.

Within the scope of the invention the most diversified possibilities of execution are provided. For example, the joint which connects the girders may consist of a pivot 2,729,945 P tented J .0 .158%

2 hshdihev hs sqh w p rus n a i on s rd h hsi a t he m er t e a t er: girder ll embr ns h s pivot hw in a f rca ed. ne Pe he Pur seh h hm mh s maybe s i abl q s tu tsi with hoolg shaped. extensions with which. they engagethe extensions of the. pivot. head. Thesehooks may advanr.

tageously be formed in such a manner that they reach over the protrusions. on the-pivot head, beyond; the hori. zontal. centerlines at. a certain angle downwardly. In accordance with the. invention the hooks may advantageou sly be formed in. a manner that they permit the. eng; gernent of. the girder section. at angles of lessthan 9Q. with respect to the horizontal.

The invention may also be realized where, a tension or stopmeans is used for theinterengaging girder sections and in all cases may be advantageouslyformedin a.man-. her that the pivot head. is provided with special shoulders which upon loosening of the tension means or with the. bending of the pivot joint downwardly, engage the hooks of. the cheek member and maintain the engagementof, the pivot connection, while still permitting the substantially vertical dropping. of the robbed girder member. clnring robbing or withdrawing operations.

Further advantageous details of the invention are shown in. the drawing. where. the invention explained in connectionwith one embodiment and where,

Fig. 1 is a side View ot a girder member connection c rdance w t h ihvh a Fig. 2 is a cross section along the IineII- II of Fig. I;

Fig. 3 is a cross section along line lII IIl of-Fig. 2, but; with the wedge. removed; his. s a s e atic llu tra o h hfill h haw structurein accordance with the invention,

In accordance with the. illustrations of Figs, 1 3. the two adjoining ends of the girders 1 engage each other. directly in. the manner of pivot. joints, in that at one end of the i de emb a pi he d is rr n e hd hi e, 9th?! hf t o; chee membe s 3, d s S i by e din t t e ird r m e s l- Wi n the che s the pivot h ad 1 s wi en d. by twhp o r ihns 4. b hi d. hich h h k l yo f the joint reach with their: hook shaped extensions fi, Atthe h 'ttq n id i h ird mem e 1 n c ance with the embodiment shown twoidentically formed ahirt; m ats ar q i d, f r a washin ea s 7 ich ma be in the forin of a wedge. By such an arrangement and construction of the tensioning means the moments which occur when loading the projecting joint cap are converted into a pair of forces extending horizontally through the center point of the joint and the wedge. From this favorable conditions are obtained for the loads on the components of the joint, because bending moments are avoided to a great extent and converted into tractive forces.

In accordance with a particularly preferred embodiment of the invention the hook shaped extensions 5 have their lower portions 8 formed in such a manner that they reach around the extensions 4 of the pivot head 2 at a certain angle and thereby avoid the unintentional disengagement. On the other hand, the hook shaped extensions 5 are made so short towards the bottom that they permit the engagement of the cap of the joint at rather small angles (approximately 60 with respect to the horizontal). Furthermore, the pivot head has shoulder-like abutments 9, which extend at a certain angle (about 10) obliquely towards the top and which are intended to lie upon the hook shaped extensions 5 of the joint checks 3 if the joint connection drops and thus to maintain together with the extensions 4 and the hook shaped extensions 5 a connection with the caps of the joint.

In the drawings described the individual parts are connected to the girder section by means of welding. Of course, the pivot members may form a single forged, pressed or cast unit with the section. For some cases in t 3 the dismantling as well as in the installation it is suitable that joint members be given considerable freedom of movement with respect to each other. For this purpose the joint head is provided with beveled portions 10 which makepossible a turning of the pivot members with respect to each other. While the illustrations of the drawing show a joint cap where the joint head is at the stope side of the'mine and the checks of the fork at the excavated side, the hook shaped extensions 5 may also be on the pivot head and the corresponding extensions 4 on the joint cheeks. In this case the joint head is at the excavated side and the joint hooks at the stope side of the joint cap.

the general shape of curved claws encompassing said As may be seen from Fig. 4 the joint construction provided by the invention makes it possible at the side of the coal layer 12, to first hook up the girder which is to be projected at a certain angle to the end of the last girder and then to swing it upwardly toward the top where it is retained in the desired position by the wedge 7. On the other hand the illustration of Fig. 4 shows on the left side that the girder which is to be removed can drop freely out of the pivot joint as soon as it has moved through a certain angle upon loosening of the associated prop 13. Any difficulties such as arise where pivot bolts are used do therefore not occur in connection with the mine filling frame construction in accordance with the invention. 7

The invention is by no means exhausted by the embodiments illustrated. The basic teachings of the invention may rather be realized in any other desired manner. Even though the invention is preferably used with girder connections which employ a stopping or tensioning means it may also be advantageous, if desired, to realize the invention in such a manner that the ends of the girders are connected with one another without tensioning means merely in the manner shown and illustrated.

Having thus described and illustrated my invention with reference to the embodiment shown, I do not wish to be limited thereto, but what I claim as my invention is set forth in the appended claims.

I claim:

1. Mine filling frame structure including props and girders, wherein the ends of the girders are provided with interengaging conformations defining pivot joints between adjoining girders, said conformations being constituted by laterally extending bosses defining a pivot head at an end of one girder and by curved recesses formed in spaced cheeks defined by the bifurcated end of another girder defining claws in said cheeks, the said claws having engagement with said laterally extending bosses and having constituting said pivot joints and aflording freedom of movement for one of the girders downwardly, and tensioning means for said pivot joints comprising a jaw at the end of each adjoining girder end below the pivot forming conformations, and a wedge for engagement with saidjaws for securely supporting one girder at the end of the other girder.

2. A girder for a mine filling frame structure having end conformations adapted for interengagement with cooperating conformations at the ends of cooperating girders, the conformations at one end of said girder being substantially in the form of a pivot head having laterally extending bosses and the conformations at the other end of said girder constituting claws defined by curved recesses in the inner walls of spaced cheeks and by the curved ends of said cheeks, said one end of said girder being also provided with curved abutments separated from said bosses by a distance slightly greater than the width of said claws longitudinally of said girder, and each-end of said girder being provided with a member constituting a jaw adapted to receive and operatively engage one side of a wedge, thereby securely supporting one girder atthe end of another girder.

3. Mine filling frame structure for location before the working face of a mine, including props and girders, where a girder is provided with laterally projecting conformations defining a pivot head at one end and at the other end with recessed conformations constituting curved claws'defined in spaced cheeks adapted to fit from above over the pivot head of the preceding girder to form a joint, and tensioning means adapted to sustain the last girder, said tensioning means including abutment conformations defined below and extending longitudinally of the ends of the girders'and wedge means disposed transversely of said abutments below the interengaged portions of adjacent girders forming said joints.

References Cited in the file of this patent UNITED STATES PATENTS 2,510,593' Mechling .a.; June 6, 1950 5 2,554,210 Pierre May 22, 1951 I FOREIGN PATENTS 528,493 Great Britain 1940 701,893

Germany 1941

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