US3855808A - Shifting system for walking supports - Google Patents

Shifting system for walking supports Download PDF

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US3855808A
US3855808A US00396548A US39654873A US3855808A US 3855808 A US3855808 A US 3855808A US 00396548 A US00396548 A US 00396548A US 39654873 A US39654873 A US 39654873A US 3855808 A US3855808 A US 3855808A
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shift
hand
rod
piers
pivotally connected
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US00396548A
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G Alacchi
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith

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  • ABSTRACT A shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers.
  • a shift rod is pivotally connected on the one hand to the lower frame of said pier and on the other hand to said shift beam.
  • a first shift jack is pivotally connected to the one hand to said lower frame and on the other hand to said rod.
  • a second shift lock is pivotally connected on the one hand to said shift beam and on the other hand to said shift rod.
  • the object of the invention is thus to provide a shift system for walking supports for coal mines which, on the one hand, enables workings to advance in a precise horizontal direction perpendicular to the line of maximum inclination of the workface and, on the other hand, enables the shift beam of the system to be displaced parallel to itself.
  • this object is achieved through a shift system for walking supports of the type comprising at least two successive piers coupled to'one and the same shift beam situated ahead of said piers, distinguished by the fact that, for connecting each of said piers to said beam, it comprises a shift rod pivotally connected on the one hand to the lower frame of said pier and, on the other hand, to said shift beam and two shift jacks of which the first is pivotally connected on the one hand to the lower frame and on the other hand to said rod, whilst the second is pivotally connected on the one hand to said shift beam and on the other hand to said shift rod.
  • This arrangement shows a first advantage of the invention because, by virtue of the geometric configuration advantageously adopted for connecting each of the piers of the walking support to the shift beam by means of the shift rod and the two shift jacks, it is very easy to satisfy the two requirements referred to above at one and the same time and, hence, to avoid the disadvantages normally encountered in conventional systems.
  • piers are piers of any known type, for example comprising an upper frame 4 connected toa lower frame 5 through at least two props 6 and 7, and a connecting jack 8 and, optionally, other components such as sets of rods pivotally connected to said frames or other props (not shown).
  • Each of the upper frames 4 carries a cowl 9 pivotally connected to said upper frame about two aligned axes 10 and 11, the cowls 9 being themselves each provided with a cushion 12 of water under pressure.
  • the present invention is essentially embodied in the nature and arrangement of the components by which each of the piers l and 2 of the walking support are connected to the shift beam 3.
  • this connection is established through a shift rod 13 pivotally connected on the one hand at one of its ends about an axis 14 to a member 15 integral with the upper frame 5 of the pier and, on the other hand, at its other end, about an axis 16 to a member 17 integral with the shift beam 3, the two axes 14 and 15 being parallel to one another and perpendicular to the plane of the lower frame 5 and of the shift beam 3.
  • a first double-acting shift jack 18 is pivotally connected onthe one hand to the lower frame 5 aboutan axis 19 at one of its ends, and, on the other hand, to the shift rod 13about an axis 20 at its other end, these two axes l9 and 20 being parallel to one another and to the axes 14 and 16.
  • a second double-acting shift jack 21 is pivotally connected on the one hand to the shift beam 3 about an axis 22 at one of its ends and, on the other hand, to the shift rod 13 about an axis 23 at its other end, these two axes 22 and 23 again being parallel to one another and to the axes 14, 16, 19 and 20.
  • the fixed distance between the axes 14 and 19 is designed to be equal to the similarly fixed distance between the axes 16 and 22.
  • the two fixed distances between the axes 14 and 20 and between the axes 16 and 23 are designed to be equal.
  • the shifting system for walking supports consists of two piers l and 2 coupled to a common shift beam 3.
  • the shift beam 3 is shifted by acting on the jacks of one pier, for example the pier l, by delivering the same quantity of fluid to the two jacks l8 and 21 in known manner, the two identical jacks of the pier 2 being at exhaust, so that the shift beam 3 is brought into the position shown in chain-lines in FIG. 1.
  • the piers are shifted in turn in a second stage, the shift beam 3 having been advanced as described above.
  • the shift beam 3 being fixed in position by locking the jacks 18 and 21 of the pier 1 held in its braced position by its props 6 and 7, the pier 2 is initially advanced after having been loosened (the initial position of this pier is shown in chain-lines in FIG. 2) by retracting the two jacks l8 and 21 of the pier 2, equal in length, by delivering the same quantity of fluid to the minor face of the two jacks l8 and 21 of the pier 2.
  • the pier 2 arrives in its final position, after having made a translation represented by the trajectory 26 of a peak 2a of the pier 2, shown in chain-lines in FIG. 2, it is tightened up, and the same procedure is adopted for shifting the following piers.
  • the shift beam 3 can carry one or more props 27 designed to reinforce the application to the roof of a known type of shield (not shown) pivotally mounted on the front of the upper frame of each of the piers.
  • a shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers, the improvement comprising means, for connecting each of said piers to said beam, said means comprising a shift rod pivotally connected on the one hand to thc lowerframc of said pier and on the other hand to said shift beam, and two shift jacks of which the first is pivotally connected on the one hand to said lower frame and on the other hand to said rod, whereas the second is pivotally connected on the one hand to said shift beam and on the otherhand to said shift rod.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
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Abstract

A shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers. For connecting each of said piers to said beam, a shift rod is pivotally connected on the one hand to the lower frame of said pier and on the other hand to said shift beam. A first shift jack is pivotally connected to the one hand to said lower frame and on the other hand to said rod. A second shift lock is pivotally connected on the one hand to said shift beam and on the other hand to said shift rod.

Description

I Jnited States Patent [191 Alacchi 1 Dec. 24, 1974 1 SHIFTING SYSTEM FOR WALKING SUPPORTS [76] Inventor: Georges Alacchi, 9 ter cours Fauriel,
[52]v U.S. Cl 61/45 I) [51] Int. Cl .L E21d 15/44 [58] Field of Search 61/45 D, 45 C, 63; 299/11,
830,342 3/1960 Great Britain 61/45 D 957,071 5/1964 Great Britain 61/45 D 1,213,019 11/1970 Great Britain 61/45 D Primary Examiner-Dennis L. Taylor Attorney, Agent, or Firm-Dennison, Dennison, Townshend & Meserole [57] ABSTRACT A shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers. For connecting each of said piers to said beam, a shift rod is pivotally connected on the one hand to the lower frame of said pier and on the other hand to said shift beam. A first shift jack is pivotally connected to the one hand to said lower frame and on the other hand to said rod. A second shift lock is pivotally connected on the one hand to said shift beam and on the other hand to said shift rod.
4 Claims, 3 Drawing Figures PATENTED DEB24I974 SHEET 1 OF 2 BACKGROUND OF INVENTION It is standard practice in the mining industry and, in particular, in coal workings to couple several supporting piers to one and the same shift beam with a view to successively and alternately shifting each of said piers at a rate commensurate with the rate of advance whilst the adjacent pier(s) maintain their pressure on the roof in their respective work zones.
Unfortunately, these known systems all have the disadvantage of being relatively sensitive to the slope of the workface. Accordingly, it is difficult by means of these systems to ensure advance in a specific geometric direction.
BRIEF SUMMARY OF INVENTION The object of the invention is thus to provide a shift system for walking supports for coal mines which, on the one hand, enables workings to advance in a precise horizontal direction perpendicular to the line of maximum inclination of the workface and, on the other hand, enables the shift beam of the system to be displaced parallel to itself.
According to the invention, this object is achieved through a shift system for walking supports of the type comprising at least two successive piers coupled to'one and the same shift beam situated ahead of said piers, distinguished by the fact that, for connecting each of said piers to said beam, it comprises a shift rod pivotally connected on the one hand to the lower frame of said pier and, on the other hand, to said shift beam and two shift jacks of which the first is pivotally connected on the one hand to the lower frame and on the other hand to said rod, whilst the second is pivotally connected on the one hand to said shift beam and on the other hand to said shift rod.
This arrangement shows a first advantage of the invention because, by virtue of the geometric configuration advantageously adopted for connecting each of the piers of the walking support to the shift beam by means of the shift rod and the two shift jacks, it is very easy to satisfy the two requirements referred to above at one and the same time and, hence, to avoid the disadvantages normally encountered in conventional systems.
Other features and advantages of the shifting system according to the invention will become apparent from the following description, given purely by way of example, of one embodiment of this system in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS These piers are piers of any known type, for example comprising an upper frame 4 connected toa lower frame 5 through at least two props 6 and 7, and a connecting jack 8 and, optionally, other components such as sets of rods pivotally connected to said frames or other props (not shown). Each of the upper frames 4 carries a cowl 9 pivotally connected to said upper frame about two aligned axes 10 and 11, the cowls 9 being themselves each provided with a cushion 12 of water under pressure.
The present invention is essentially embodied in the nature and arrangement of the components by which each of the piers l and 2 of the walking support are connected to the shift beam 3.
For each of these piers, this connection is established through a shift rod 13 pivotally connected on the one hand at one of its ends about an axis 14 to a member 15 integral with the upper frame 5 of the pier and, on the other hand, at its other end, about an axis 16 to a member 17 integral with the shift beam 3, the two axes 14 and 15 being parallel to one another and perpendicular to the plane of the lower frame 5 and of the shift beam 3.
In addition, a first double-acting shift jack 18 is pivotally connected onthe one hand to the lower frame 5 aboutan axis 19 at one of its ends, and, on the other hand, to the shift rod 13about an axis 20 at its other end, these two axes l9 and 20 being parallel to one another and to the axes 14 and 16.
Similarly, a second double-acting shift jack 21 is pivotally connected on the one hand to the shift beam 3 about an axis 22 at one of its ends and, on the other hand, to the shift rod 13 about an axis 23 at its other end, these two axes 22 and 23 again being parallel to one another and to the axes 14, 16, 19 and 20.
The fixed distance between the axes 14 and 19 is designed to be equal to the similarly fixed distance between the axes 16 and 22.
Similarly, the two fixed distances between the axes 14 and 20 and between the axes 16 and 23 are designed to be equal.
Thus, since the two shift. jacks 18 and 21 are themselves equal in length in each of their positions, the two jacks being fed with identical quantities of fluid through a known'feed system (not shown), it can be seen that the two triangles formed respectively in the plane of the Figure by the axes l4, l9 and 20 and by the axes 16, 22 and 23 will always remain equal and homothetic relativeto the centre. of the shift rod 13, and that, accordingly, through a simple property of geometry both the shift beam 3 and the supporting piers 1 and 2 will be displaced during shifting parallel to FIG. 1 is a view from above, in diagrammatic section I on the line lI of FIG. 3, of the entire shifting system DESCRIPTION OF PREFERRED EMBODIMENT As can be seen from FIG. 1, the shifting system for walking supports according to the invention consists of two piers l and 2 coupled to a common shift beam 3.
themselves.
In addition, if, shown in broken lines in FIG. 1, care is taken to provide an angular movement for the shift rod 13 such that these two initial andfinal end positions are symmetrical one with the other relative to the straight line 24 intersecting the axis 14 and parallel to the direction of maximum slope 25 of the workface, it will readily be appreciated that the end positions in the movement corresponding to each of the points of the shift beam 3 will be situated on a common line perpendicular to the direction of maximum inclination 25, i.e. from a horizontal line.
Accordingly, the shift beam 3 is shifted by acting on the jacks of one pier, for example the pier l, by delivering the same quantity of fluid to the two jacks l8 and 21 in known manner, the two identical jacks of the pier 2 being at exhaust, so that the shift beam 3 is brought into the position shown in chain-lines in FIG. 1. The piers are shifted in turn in a second stage, the shift beam 3 having been advanced as described above.
For this purpose, the shift beam 3 being fixed in position by locking the jacks 18 and 21 of the pier 1 held in its braced position by its props 6 and 7, the pier 2 is initially advanced after having been loosened (the initial position of this pier is shown in chain-lines in FIG. 2) by retracting the two jacks l8 and 21 of the pier 2, equal in length, by delivering the same quantity of fluid to the minor face of the two jacks l8 and 21 of the pier 2. When the pier 2 arrives in its final position, after having made a translation represented by the trajectory 26 of a peak 2a of the pier 2, shown in chain-lines in FIG. 2, it is tightened up, and the same procedure is adopted for shifting the following piers.
In addition, the shift beam 3 can carry one or more props 27 designed to reinforce the application to the roof of a known type of shield (not shown) pivotally mounted on the front of the upper frame of each of the piers.
The invention is by no means confined to the embodiment described purely by way of example in the foregoing, instead it covers any modification included within the scope of the following Claims.
I claim:
1'. A shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers, the improvement comprising means, for connecting each of said piers to said beam, said means comprising a shift rod pivotally connected on the one hand to thc lowerframc of said pier and on the other hand to said shift beam, and two shift jacks of which the first is pivotally connected on the one hand to said lower frame and on the other hand to said rod, whereas the second is pivotally connected on the one hand to said shift beam and on the otherhand to said shift rod.
2. A shifting system for walking supports as claimed in claim 1, where in the distances of each of the pivotal connections of one of the two shift jacks to the pivotal connection of the rod to the lower frame are equal and opposite in direction to those separating each of the pivotal connections of the other shift jack from the pivotal connection of the rod to the shift beam.
3. A shifting system for walking supports as claimed in claim 2, where in the shift beam comprises a connecting jack arranged in the axis of said beam, its piston head being connected to the adjacent beam through a connecting chain.
4. A shifting system for walking supports as claimed in claim 3, where in the shift beam carries at least one prop intended to reinforce application to the roof of a shield pivotally mounted on the front of the upper frame of each pier.

Claims (4)

1. A shifting system for a walking support of the type comprising two successive piers coupled to a common shift beam situated ahead of said piers, the improvement comprising means, for connecting each of said piers to said beam, said means comprising a shift rod pivotally connected on the one hand to the lowerframe of said pier and on the other hand to said shift beam, and two shift jacks of which the first is pivotally connected on the one hand to said lower frame and on the other hand to said rod, whereas the second is pivotally connected on the one hand to said shift beam and on the otherhand to said shift rod.
2. A shifting system for walking supports as claimed in claim 1, where in the distances of each of the pivotal connections of one of the two shift jacks to the pivotal connection of the rod to the lower frame are equal and opposite in direction to those separating each of the pivotal connections of the other shift jack from the pivotal connection of the rod to the shift beam.
3. A shifting system for walking supports as claimed in claim 2, where in the shift beam comprises a connecting jack arranged in the axis of said beam, its piston head being connected to the adjacent beam through a connecting chain.
4. A shifting system for walking supports as claimed in claim 3, where in the shift beam carries at least one prop intended to reinforce application to the roof of a shield pivotally mounted on the front of the upper frame of each pier.
US00396548A 1973-09-12 1973-09-12 Shifting system for walking supports Expired - Lifetime US3855808A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679856A (en) * 1983-09-21 1987-07-14 Klockner-Becorit Gmbh Mine self-advancing roof support and method of relocating a mine winning face equipped with self-advancing roof support

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT192363B (en) * 1954-03-02 1957-10-10
GB830342A (en) * 1955-06-20 1960-03-16 Becorit Grubenausbau Gmbh Improvements in mine gallery-supporting systems
US3113661A (en) * 1959-09-09 1963-12-10 Gewerk Eisenhuette Westfalia Apparatus for displacing a longitudinal mining conveyor
GB957071A (en) * 1961-02-03 1964-05-06 Dowty Mining Equipment Ltd Advancing roof-supporting device
US3381586A (en) * 1965-06-10 1968-05-07 Gewerk Eisenhuette Westfalia Mine roof prop and advancing arrangement
US3482878A (en) * 1967-01-13 1969-12-09 Gewerk Eisenhuette Westfalia Traveling support assembly for a longwall mining plow and conveyor
GB1213019A (en) * 1968-02-16 1970-11-18 Wild A G & Co Ltd Improvements in or relating to underground roof support systems

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT192363B (en) * 1954-03-02 1957-10-10
GB830342A (en) * 1955-06-20 1960-03-16 Becorit Grubenausbau Gmbh Improvements in mine gallery-supporting systems
US3113661A (en) * 1959-09-09 1963-12-10 Gewerk Eisenhuette Westfalia Apparatus for displacing a longitudinal mining conveyor
GB957071A (en) * 1961-02-03 1964-05-06 Dowty Mining Equipment Ltd Advancing roof-supporting device
US3381586A (en) * 1965-06-10 1968-05-07 Gewerk Eisenhuette Westfalia Mine roof prop and advancing arrangement
US3482878A (en) * 1967-01-13 1969-12-09 Gewerk Eisenhuette Westfalia Traveling support assembly for a longwall mining plow and conveyor
GB1213019A (en) * 1968-02-16 1970-11-18 Wild A G & Co Ltd Improvements in or relating to underground roof support systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679856A (en) * 1983-09-21 1987-07-14 Klockner-Becorit Gmbh Mine self-advancing roof support and method of relocating a mine winning face equipped with self-advancing roof support

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