US2640674A - Mine stemple comprising two telescoping sections - Google Patents

Description

MINE STEMPEL COMPRISING TWO TELESCOPING SECTIONS K. GERLACH June 2, 1953 3 Sheets-Sheet 1 Filed Dec.

' Inventor:

H r C W .6 Mk 6 Y 8 K. GERLACH June 2, 1953 MINE STEMPEL COMPRISING TWO TELESCOPING SECTIONS 3 Sheets-Sheet 2 Filed Dec. 13 1950 my. a

June 2, 1953 I K. GERLACH MINE STEMPEL COMPRISING TWO TELESCOPING SECTIONS 3 Sheets-Sheet 3 Filed Dec. 13 1950 Inventor:

KA 24 c; 5/?4 A 01 WW ,4 4 67V r Patented June 2, 1953 UNITED s'TA'rss PATENT OFFICE MINE ."S'I-IEMPLE COMPRISING TWO- TELE'SCO PING SECTIONS Karl "Gerlac'h, Moe'r's, Germany application December 13, 19-50, s n man-s09 fIn Gerni'any'Decembex- 14, 1949 "6 Claims.

"The invention relates 170 2a 'min'e prop or stemple in two parts "in. "which the inner s'temple is under the control of a'lcey orwedgewhich may. for example, be slidable in the rigid pocket or "a lock and which carries the key along over'aportion'of its path or" travel as it sinksin't'othe lower stemple. 'By carrying along this sliding wedge the resistance of the steinpleagainst yielding is to be rapidly increased if the inner stemple "sinks into the lower stemple under the effects ofmuuntain'pressure. "However, as soon as the 'stem'pl'e has attained its maximum engagement pressure, the further sliding of the wedge must cease and "the inner stemple should sink intotne lower stemple independently.

For "the course of the stemple resistance it is of decisive significance in such mine stem'ples'to attain the same initial position of the sliding wedge each time the stemple is set. For'thispurpose the sliding wedge was "provided with abutments which limited the possibility of its-movement upwardly and which, during placing was brought into "the starting position either auto- "matically, by means of a spring, or manually.

The manual "operation had the disadvantaged? being dependent on the carefulness of the operator. Also, bymeans of the spring it was not "possible to reliably attain an initial position which was the same in all cases, because the sprin wasfi'rst of all subject to phenomena of weakening and was frequently hampered in its efiectiveness byunexpecte'd resistances. Besides,

alsothe sensitivity of the spring to interference caused by the rugged conditions of the mining operations was a disadvantage.

mining the initial position of the sliding wedge with a setting device, for example, in the form of a cross-key. In this respect the inventioncan preferably be realized ior stemples in which the sliding wedge is connected with the inner stemple by an automatically releasable coupling. -In

that case the setting device "which is combined with the "intermediate member may, "for the purpose of setting, engage the coupling member and set the stemple simultaneously as the intermediate member is introduced. The coupling mem- :ber may, for this purpose, be in the form of a load clamp "which wedges itself on the inner stemple and rests at one end upon the sliding wedge.

In accordance with a particularly preferred embodiment of the invention the sliding wedge and the intermediate member may be coupled by compulsory guide means in such a manner, that ior each position of the intermediate member there is a predetermined corresponding position oi the sliding wedge. For example, the sliding wedge and the intermediatemember may, for thi purpose 'interengage by means of recesses in theiorm of grooves.

by means of such a grooved engagement the position of the sliding wedge is absolutely fixed upwardly and downwardly in any desired initial position, so that it is assured that the slidin wedge always assumes its "desired predetermined initial position as 'the intermediate member is operated.

More in particular, the invention may be realized, for example, in that the sliding wedge is provide-a with a"'shduiiier or abutment which enages 'ag'roove or recess in the intermediate member. On 'theother hand, "embodiments "of the invention are possible where the intermediate member engages a groove in the sliding wedge by means for a ledge or projection.

i 'or 'thecas'e where-the intermediate member is used simultaneously as a setting device for a wedge clamp which engages the inner stemple, there exists a further essential advantage of the :present invention in the possibility of bringin the intermediate member to rest upon an insert in the steeple lo'ck which is not automatically 1ockingfinsroad "oi the steznple lock proper.

in iron mine stamp-leg where the inner stem plc is wedge shaped, it is possible to realize the invention in a manner that "the wedge 'cl'amp which clamps itself "to the inner stempl'e by means of its edges and rests at one end upon the sliding wedge, forms "a temporary cou ling "between "the inner stemple "and "the sliding wedge and "is made to engage the parallel wall planes 'dr'the profile 6f the inner 'stem'ple.

The parallel wall planes'may, for example, be provided upon ribs for "other projections of the cross=section "of the inner 's't'emple which are 'in "dependent 'o'r' tne wedge ortaper'e'd Iform of the inner 'ste'm'ple. In this manner the advantage "is obtained that independently of the wedge shape "of the inner stem'ple' reliable wedging of the load a clamp is assured. This is not always the case, when the load clamp engages the wedge shaped planes of the inner stemple, because the tolerance between the clamp and the downwardly tapering inner stemple becomes too great if the inner stemple is pulled out of the outer stemple during setting.

Further advantageous details of the invention are shown in the drawing in which the invention is illustrated by way of examples and in. which:

Fig. 1 is a side elevation of a mine stemplein accordance with the invention in robbed con-- dition;

Fig. 2 is a plan view in accordance with Fig. 1;

Figs. 3 and 4 show the same stemple in side: elevation in two different setting positions;

Fig. 5 is a view from the right hand side of .of the invention.

In the drawings like reference numerals refer to corresponding parts. I is the inner stemple which is preferably tapered or wedge shaped, 2 is the outer stemple and ,3 the sliding wedge which is supported by a horizontal key 5 in the stemple look 6 by way of an insert 4 which is not self locking. The insert 4 here rests in the stemple lock 6 against a movable insert member I by means of the key plane 8 which is not self looking. 9 is the wedge clamp which can be made to engage the parallel wall planes It of the inner stemple which are provided upon parallel walled ribs II on the inner stemple section.

In Fig. 1 a two section mine stemple is shown in robbed, i. e. in fullyinserted condition. The loading or wedge clamp 9 in this case rests upon the sliding wedge 3 as well as upon outer stemple 2 so that the coupling with the inner stemple I is released. The sliding key 3 rests upon the lock 6 with its plane I2.

In Fig. 3 an intermediate member I3 has been placed between sliding wedge 3 and lock 6 in such a manner, that the sliding wedge is pulled out of the stemple lock B by a predetermined amount and a space a is formed between the upper edge of the lock 6 and the plane I2, over which distance the sliding wedge 3 is carried along by the wedge clamp 9 when the inner stemple sinks so that the sliding wedge 3 is assigned a predetermined path in order to thus obtain a definite resistance curve of the stemple- The initial position of the sliding wedge 3 is therefore determined by the intermediate member I3. It is seen from Fig. 5 that the intermediate member I3 is provided with a slope I4 by means of which the intermediate member may readily be moved between the sliding wedge 3 and lock 6.

A key I5 is rigidly connected with the intermediate member I3 which key rests at its lower end upon the lock 6 and whose upper oblique edge rests under the load clamp 9.

The operation takes place in the following manner: The key I5 with the intermediate member I9 is pushed between sliding wedge 3 and lock 6 of the inserted stemple in accordance with Fig. 1 until the sliding wedge 3 has reached its full height a. Since the load clamp 9 now rests no longer upon the lower stemple 2 it is possible to pull the inner stemple manually to the,

overhanging slope and the load clamp 9 holds it in this position because as the inner stemple I is released it immediately and automatically assumes a wedged position.

If the key I5 is now driven in as shown in Figs.

4 and 5 it presses the inner stemple upwardly against the overhang by means of load clamp 9 which as a result of this movement is wedged upon the inner stemple I. Since the intermediate member I3 extends with even thickness alon the setting key It no movement of the sliding key 3 takes place during setting operation. It must be mentioned here that the sliding wedge is provided with abutments or shoulders IE to limit the movement in an upward direction.

N ow the horizontal key 5 is fastened as the intermediate member I3 is removed with the setting key l5. The wedge clamp 9 then drops upon the wedge key 3 and wedges with the ribs II of the inner stemple I when the inner stemple I begins to sink into outer stemple 2 under the influence of the mountain pressure. As a consequence of this wedging the inner stemple I carries along the slidin wedge 3 downwardly over a predetermined distance, i. e. the distance a, whereupon the wedging clamp 9 comes to rest upon the abutment 23 of the stemple lock 6 or of the outer stemple 2 and its wedging efiect is eliminated.

In the example illustrated intermediate mem ber l3 and the wedge key I5 are combined into a unitary member. Naturally their separate embodiments are possible. Besides it is possible to form the intermediate member I3 in a manner that its thickness can be varied by adjustable means and to thus change the distance a for the sinking path of the sliding wedge within certain limits.

The arrangement of the upper edge of the intermediate member I3 which engages the sliding wedge 3 determines the height of withdrawal of the sliding wedge so that it is possible for example, to raise the sliding wedge during setting by distances of approximately 4', or 1". Since the sinking path of the sliding key 3 determines the pressure absorption the pressure curve of the stemple is thus changed. In robbing the stemple the loading clamp 9 can be disconnected. This disconnecting can be aided by additional means as, for example, springs or the like.

It is also possible to provide the arrangement in such a manner as to divide the key I 5 so that the raising of the slidin key by the intermediate member I3 is effected from the lock side while the raising of the inner stemple I is effected at the back side by means of a special wedge clamp which serves only for setting. In this connection the key and the intermediate member have as a whole a bifurcated form.

In the embodiment in accordance with Fig. 6 the intermediate member I3 is provided with two ledges I1 and I8 which engage a shoulder I9 of the sliding wedge 3 in the manner of a groove. By means of such a groovelike engagement between sliding wedge 3 and intermediate member I3 the position of the sliding wedge 3 is determined with absolute certainty by driving in the intermediate member I3 which is in the form of a key more or less deeply, so that the adherence to a definite path of the sliding wedge is insured. The intermediate member I3 may here as in the previously described illustrations be formed as a setting key and for this purpose it may engage the wedge clamp 9. Suitably it does not rest upon the stemple lock 6 here but upon the insert 4. When the stemple is set the insert 4 is here pressed downwardly as the intermediate member I3 is driven in and in view of its key plane 8 which is not self locking and the insert piece 1 all tolerance in the stemple lock can be eliminated and particularly the inner stemple i can be securely pressed between the back of the lock or the opposite side of the outer stemple 2. In driving in the horizontal key 5 the insert t in lock 6 which is not self locking is secured in its position and simultaneously the lock is placed under tension. Now if upon elimination of the setting device and thus also of the intermediate member l3 the inner stemple I sinks downwardly under the mountain pressure and carries along the sliding key I 3 by way of the wedge clamp 9 downwardly, a large amount of the stemple load becomes immediately effective in the lock 6 before the inner stemple can sink in without encountering noticeable resistance to eliminate unusual tolerances between the portions of the look.

In the embodiments in accordance with Fig. 7 v

the intermediate member I3 which is also constructed as a setting device is provided with a ledge 20 which engages one or two ledges 2| and 22 of the sliding wedge 3. The manner of operation is the same here as explained in connection with the embodiment of Fig. 6.

Having thus fully described my invention and its method of operation with reference to the embodiments shown in the drawings, I claim:

1. A mine stemple comprising two telescoping sections, a lock secured to the outer of said sections, clamping means extending intermediate said lock and the inner of said sections, a sliding wedge disposed intermediate said lock and said inner section and means adapted to determine the initial position of said sliding wedge comprising an intermediate member defining a ledge movably disposed intermediate said sliding wedge and said outer section adjacent said lock.

2. A mine stemple comprising two telescoping sections, a lock secured to the outer of said sections, clamping means extending intermediate said lock and the inner of said sections, a sliding wedge disposed intermediate said lock and said inner section and means adapted to determine the initial position of said sliding wedge comprising an intermediate member defining a ledge movably disposed intermediate said sliding wedge and said outer section adjacent said lock, said intermediate member including a portion defining a transverse key having a sloping surface in engagement with said clamp, whereby said inner stemple may be moved vertically in response to horizontal movement of said intermediate member.

3. A mine stemple comprising two telescoping sections, a lock secured to the outer of said sections, clamping means extending intermediate said lock and the inner of said sections, a sliding wedge disposed intermediate said lock and said inner section and means adapted to determine the initial position of said sliding wedge comprising an intermediate member defining a ledge movably disposed intermediate said sliding wedge and said outer section adjacent said lock, said intermediate member having a conformation defining a slope at the end of said ledge which first engages said sliding wedge.

4. A mine stemple comprising two telescoping sections, a lock secured to the outer of said sections, clamping means extending intermediate said lock and the inner of said sections, a, sliding wedge disposed intermediate said lock and said inner section and means adapted to determine the initial position of said sliding wedge comprising an intermediate member movable transversely of said sections and an insert member disposed in said lock having surface engagement with said sliding wedge, with said intermediate member and with components of said lock.

5. A mine stemple comprising two telescoping sections, a lock secured to the outer of said sections, clamping means extending intermediate said lock and the inner of said sections, a sliding wedge disposed intermediate said lock and said inner section and means adapted to determine the initial position of said sliding wedge comprising an intermediate member movable transversely of said sections and an insert member disposed in said lock having surface engagement with said sliding wedge, with said intermediate member and with components of said lock, said intermediate member including a portion defining a transverse key having a sloping surface in inner stemple and an intermediate member movable transversely of said telescoping sections adjacent said lock, said intermediate member including a shoulder adapted to engage a conformation on said sliding wedge and a sloping portion adapted to engage said clamp.

KARL GERLACH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,297,469 Groetschel Sept. 29, 1942 2,445,543 Thines July 20, 1948 2,514,965 Pierre July 11, 1950

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