US3415065A - Advanceable mining prop arrangement containing stabilizer means - Google Patents

Advanceable mining prop arrangement containing stabilizer means Download PDF

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US3415065A
US3415065A US673520A US67352067A US3415065A US 3415065 A US3415065 A US 3415065A US 673520 A US673520 A US 673520A US 67352067 A US67352067 A US 67352067A US 3415065 A US3415065 A US 3415065A
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prop
stabilizer
advancing
cylinder
piston
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Heider Alfons
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Gewerkschaft Eisenhutte Westfalia GmbH
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Gewerkschaft Eisenhutte Westfalia GmbH
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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
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/0409—Aligning or guiding means for the supports or for the constitutive parts of the supports
    • 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0069—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices without essential advancing shifting devices

Definitions

  • a piston-cylinder device or stabilizer cylinder supporting the two units in substantially aligned upright parallel disposition both in the side-by-side position and advanced position of the two units, such stabilizer means being swingably connected at the respective ends thereof to a part of the respective units to permit swinging of the stabilizer means when the units are successively shifted, the stabilizer means being connected with the units such that in the first or side-byside position of the units the cylinder of the stabilizer means is normal to the longitudinal direction of advance of the units whereas in the second or advanced position of one unit with respect to the other such stabilizer cylinder is situated at an acute angle to the direction of advance, the stroke of the stabilizer means, e.g.
  • piston-cylinder means being such that in the first or side-by-side position such stabilizer means has a minimum effective length determined by the maximum incursion of the piston rod thereof within the cylinder while in the second or advanced position of one unit with respect to another such stabilizer means has a maximum effective length determined by the maximum excursion of said piston rod with respect to such cylinder, and control means for controlling the supply of pressure medium to the piston-cylinder device of the stabilizer means.
  • the present invention which is a continuation of application Ser. No. 529,018 filed Feb. 21, 1966, now abandoned, relates to an advanceable mining prop arrangement suitably stabilized substantially throughout the advancement cycle, and more particularly to a pair of upright props, each disposed in a substantially vertical plane and operatively interconnected by energizable reciprocal advancing means, with the vertical planes of said props being maintained in parallel relation, and energizable adjustable length stabilizer means interconnecting the upper end portions of said props, with the stabilizer means and advancing means being operatively connected for simultaneous concordant energizing thereof to achieve relative length linear displacement of one said prop with respect to the other with controlled proportionate displacement of said stabilizer means and in turn said advancing means.
  • Mining prop arrangements are known which are usually used in connection with a conventional mining conveyor whereby to guide a mining machine, such as a mining planer, along the mine face for the extraction of 3,415,065 Patented Dec. 10, 1968 mineral therefrom, with the conveyor and in turn the mining machine associated therewith being advanced in increments or in a more or less continuous manner under the urging force of an advancing cylinder, i.e., doubleacting piston-cylinder means, or by means of the mining prop arrangement associated with the conveyor for supporting the mine roof at the site of mining operations.
  • a mining machine such as a mining planer
  • a mining prop arrangement is shown in the aforesaid U.S. Patent 3,192,- 722, which includes a pair of prop frames, each including a pair of extensible and retractable mining props interconnected at their heads and feet by a roof cap and base respectively, with such frames being operatively interconnected by a piston-cylinder means, such that upon energizing the piston-cylinder means in a first step, the prop frame connected to one of the moving parts is advanced whereupon energizing in the second step results in the advance of the other frame connected to the other part.
  • the prop frame connected to one of the moving parts is advanced whereupon energizing in the second step results in the advance of the other frame connected to the other part.
  • the same is retracted from engagement with the mine roof.
  • one prop frame causes one prop frame to diverge from the normal parallel relationship with the other prop frame.
  • one prop frame may tilt outwardly or inwardly toward the other prop frame and thus decrease the sufficient support of the mine roof in the area in question.
  • the heavy roof caps on the mining frames utilized tend to drift constantly in the direction of the dip, i.e. slope, or the like, due to their weight and the weight of the props carrying the roof caps.
  • hydraulic correcting cylinders had been utilized in order to increase the stability of the entire prop system, including the pair of mining prop frames, coupled for alternate advancement with an interposed advancing means, such as a double-acting piston-cylinder means, the hydraulic correcting cylinders serving in particular to prevent any drift or divergence of one frame with respect to the other and also resisting the racking over or straining of the props, sill or base skid, and cap, of the particular mining prop frame.
  • Such correcting cylinders have provided some degree of improvement in the stability of mining prop frames, with respect to one another, but have not actually proven to be an ideal solution in terms of the specific constructions proposed. Accordingly, previous constructional proposals, such as swing links provided between adjacent props, for example, in the form of spring links or telescoping links, or the like, have been revived and recourse had to them in practice. Nevertheless, such links have not proven to be satisfactory for the desired purpose either because the length compensation that is required between adjacent props of separate, side-by-side, prop frames being stabilized in advancing one with respect to the other, is achieved by exerting forces on the prop frames which derogate from any corrective tendency to maintain the props in parallel relation.
  • the length compensation achieved by positive force such as a tension spring, compression spring, mechanical force to swing and/or telescope the link parts together, in the ultimate prevents a perfect guidance system from 'being attained.
  • positive forces utilized in order to be effective, exert an extraneous force onto the prop frames, which force, under the advancing conditions, and in terms of any unevenness in the mine floor, causes the prop frames to drift or tilt, or the like, with respect to one another rather than to maintain proper alignment.
  • link compensating devices between the links attached to the adjacent two props of the prop frames in question.
  • the link compensating devices were disposed between such links, in the form of cams, or the like, and the props to which the links were connected.
  • cam constructions produced a lengthening or shortening of the links, in dependence upon the angle of swing of the links with respect to the longitudinal direction of advance of the parallel prop frames situated thereat.
  • It is another object of the present invention to provide such a prop arrangement including a pair of mining prop frames interconnected by reciprocal advancing means along the lower portion of such frames and interconnected by way of two adjacent props at a particular longitudinal end of the arrangement near the upper ends of such props by a stabilizer means having a minimum and maximum effective length dependent upon the maximum stroke of the reciprocal advancing means utilized, whereby the advancement of one frame with respect to the other will define by way of the prop frames a vertical planar parallelogram while the assumed angular position of the stabilizer means will define by the vertical plane in which it is disposed and a plane normal to the parallel vertical planes in which the prop frames are disposed, a planar triangle, independently of any uneven condition in the mine face, so that the prop frames will not tilt from their normal parallel disposition with respect to one another.
  • an advanceable mining prop arrangement may be provided which is suitably stabilized throughout the advancement cycle by means of stabilizer means of changeable length interconnecting a pair of upright props, each disposed in a substantially vertical plane and operatively interconnected by energizable reciprocal advancing means, with the vertical planes of said props being maintained in parallel relation.
  • the stabilizer means advantageously takes the form of energizable adjustable length stabilizer means, with such stabilizer means and advancing means being operatively connected for simultaneous concordant energizing thereof to achieve relative length linear displacement of one said prop with respect to the other with controlled proportionate displacement of said stabilizer means and in turn said advancing means.
  • the construction of the present invention relates to hydraulically operated parallel advanceable mining prop frame systems having a hydraulic advancing device or motive means disposed between the two prop frames, as well as correcting cylinders of minimum and maximum effective length disposed at a level spaced from the lower portions of the prop frames for regulating the spacing of the roof caps of the frames from one another, thereby to prevent tilting or divergence as between the frames, regardless of mine floor unevenness.
  • the stabilizer means e.g., a correcting cylinder
  • the stabilizer means connects the ends of the frames by way of adjacent props at the particular corresponding frame ends in question.
  • the correcting cylinders may be hydraulically energized advantageously from either end, if desired.
  • the system of the invention is based on the fact that the stabilizer means, e.g., in the form of correcting cylinders, :in the rest position, i.e., before the start of an advance, must always be perpendicular to the longitudinal direction of advance,
  • a hydraulically operated advanceable mining prop arrangement is shown in which one prop frame may be advanced in step-like progression with respect to the other, and thereafter alternately such other prop frame then brought forward to assume the side-by-side relationship of the frames.
  • Prop frame arrangernents of the type in question are generally known, as is clear from a review of the aforementioned US. Patent 3,192,722.
  • advanceable mining prop arrangement 1 includes the upright substantially vertical and substantially parallel mining prop frames 2 and 3.
  • Frame 2 is composed of a pair of upright mining props 4 and 5 interconnected at their lower end portions by a common elongated base skid 8, or the like
  • frame 3 is composed of a pair of upright props 6 and 7 interconnected at their lower end portions by a common elongated base skid 9.
  • These prop frames each include in the usual case a roof cap (not shown) of conventional design affixed to the upper ends of the respective props in a frame in the same manner as the skid interconnects the lower ends of the props of such frames.
  • the props are generally provided in the form of extensible and retractable props, for example, hydraulically operated jacks, i.e., pit props, whereby to extend the given frame into supporting engagement with the mine roof, upon energizing the props to extend the same, and to retract the frames from supporting engagement upon retracting the props accordingly.
  • hydraulically operated jacks i.e., pit props
  • Each prop frame is thus more or less in the form of an upright rectangular configuration, and the two frames are interconnected by the reciprocal advancing means 10, in this case shown as a double-acting piston-cylinder arrangement including the cylinder 11 connected by the arm 12 with the skid 8 and the piston rod 13 carrying the double-acting piston 14 thereon, intermediate its ends, such that piston 14 is received slidably and operatively within cylinder 11, with the ends of piston rod 13 extend ing through the appropriate heads of cylinder 11.
  • the ends of piston rod 13 are connected by arms 15 and 16 with the skid 9.
  • frame 2 may be advanced in the longitudinal direction a given distance depending upon the stroke of the piston 14 within cylinder 11, whereupon props 4 and 5 may be extended to place the roof cap thereof (not shown) into engagement with the mine roof. Then, props 6 and 7 may be retracted and the reverse procedure undertaken to bring prop frame 3 forward to approach the even position with frame 2, once again, and then props 6 and 7 extended once again to place the roof cap thereof (not shown) into engagement with the mine roof.
  • This procedure for advancing in a step-like manner the pair of mining prop frames 2 and 3 is known from the aforesaid US. Patent 3,192,722.
  • the two frames are usually interconnected with the advancing piston-cylinder means at their lower end portions via connecting arms between the priston-cylinder means and the skids, and since in the usual instance these skids and connecting arms are provided of resilient metal straps, or the like, to accommodate unevenness in the mine floor and adverse conditions, theframes may often diverge from their normal parallel disposition and tilt outwardly or inwardly toward one another.
  • gangue and in particular mineral or rock particles may be dispersed along the mineway such that in the direction of advance the frames must slide over such particles, and this may be achieved with a minimum of trouble where the connecting arms, skids, or the like, are formed of resilient metal.
  • the mining prop arrangement of the type described, for instance is provided with a stabilizer means in accordance with the invention shown in the form of a changeable length piston-cylinder arrangement 17 disposed between the adjacent props 4 and 6 at one corresponding end of prop frames 2 and 3 in the longitudinal direction of advance.
  • the stabilizer means 17 includes the double-acting cylinder 18 attached via link arm 19 to the upper end portion of prop 6 as well as the piston rod 21 carrying piston 20 which is attached to the upper end portion of prop 4.
  • Piston rod 21 carries the piston 20 which is slidably and operatively received within cylinder 18 such that the over-all effective length of the stabilizer means including cylinder 18, link arm 19 and piston rod 21 may vary in dependence upon the stroke inherently possible with cylinder 18, between a predetermined minimum effective length and a predetermined maximum length.
  • the minimum effective length is that length between props 4 and 6, considering stabilizer means 17 as being disposed in a transverse base plane substantially vertically disposed and intersecting at right angles the substantially vertical and substantially parallel planes in which the frames 2 and 3 are disposed.
  • the maximum effective length of the stabilizer means 17 is appreciated from the dot-dash configuration shown in phantom in the drawing.
  • piston 20' is shown at maximum excursion of piston rod 21' with respect to cylinder 18 whereby the over-all effective length of link arm 19, cylinder 18', and piston rod 21' exists, which maximum over-all effective length is defined by the linear portion of a transverse hypotenuse substantially vertical plane in which stabilizer means 17 is disposed, such hypotenuse vertical plane intersecting the substantially parallel planes in which the frames 2 and 3 are disposed.
  • the maximum effective length of the stabilizer means 17 is achieved upon energizing the advancing piston-cylinder means 10, for example, to displace in the forward longitudinal direction of advance the frame 3 so that the same reaches the position shown in phantom.
  • the linear distance 10' of advance is specifically dependent upon and measured by the maximum stroke of the advancing means 10, i.e., the maximum stroke of piston 14 within cylinder 11.
  • the arms 12, 15 and 16 may be provided of flexible metal and/or the points of connection of arms 12, 15 and 16 to the respective prop frame may be by way of hinge means, pivot means, or the like, so long as the aforesaid parallel disposition is maintained, and/ or cylinder 11 and/or piston 14 may be of circular erosssection to permit some rotation about the longitudinal axis of rod 13, and/or the points of connection of arms 15 and 16 to the free ends of rod 13 may be hinge connections, or the like. All of such means will permit vertical dis placement within the aforementioned parallel planes of frames 2 and 3.
  • the points of attachment of piston rod 21 to the upper end of prop 4 and link arm 19 to the upper end of prop 6 may be similarly pivotal or hinged in nature, appropriate means being used, as the artisan will appreciate, to achieve a swinging relation about the vertical axis of props 4 and 6, respectively, of the stabilizer means 17 and, in particular, the corresponding piston rod 21 and link arm 19.
  • some swinging and/or pivoting may exist about the horizontal axis of each of the frames with respect to the connections of piston rod 21 and link arm 19, respectively, in order to permit the vertical displacement of frames 2 and 3 Within their planes to be achieved without hindrance from the separate connections of the stabilizer means 17 with the corresponding props 4 and 6.
  • These horizontal swinging connections may be achieved in the same manner as the flexible connections of arms 12, 15 and 16, so long as the same do not detract from the minimum and maximum effective length features of the stabilizer means 17.
  • the mini-mum effective length of the stabilizer means 17 is determined by the distance apart of props 4 and 6 when frames 2 and 3 are precisely side-by-side in relation, such that stabilizer means 17 is disposed in a transverse substantially vertical plane normal to the parallel planes of frames 2 and 3.
  • the maximum effective length of stabilizer means 17' will be achieved and such stabilizer means will be in the position shown at 17', i.e., disposed in a transverse substantially vertical angular plane intersecting the parallel planes of frames 2 and 3 so as to form a hypotenuse of a right triangle with the normal plane in which stabilizer means 17 prior to advancernent was disposed and the longitudinal extension of the vertical plane of frame 3, in the particular instance, designated by the distance 10' which in turn corresponds with the maximum stroke of the advancing piston-cylinder means 10.
  • the planar right triangle thus produced determines the dimensional features to be incorporated in the construction of the stabilizer means of the present invention when used with a given advanceable mining prop frame arrangement of the type shown or of any similar type in which one prop frame is advanced with respect to the other and in which the prop frames are meant to be maintained in stabilized upright, substantially parallel and substantially vertical spaced apart relation.
  • the minimum effective length of the stabilizer means 17 is determined by the maximum incursion of piston rod 21 Within cylinder 18, and the maximum effective length of stabilizer means 17 is determined by the maximum excursion of piston rod 21 with respect to cylinder 18.
  • This over-all stroke represents the difference in effective length between the minimum effective length of stabilizer means 17 when in the starting position precisely normal to the frames 2 and 3 and the maximum effective length of stabilizer means 17 in the position shown in phantom, i.e., the hypotenuse dimension of the resultant right triangle with the base dimension distance between props 4 and 6 and the maximum stroke distance 10' or triangle height corresponding to the maximum stroke of advancing means 10.
  • the maximum stroke of the advancing means 10 must be considered in determining the precise difference in effective length achieved by the stabilizer means 17 as aforesaid, and the maximum effective stroke must be utilized in advancing one prop frame with respect to the other in order to achieve the stabilizing effect of the invention when the maximum stroke of the stabilizer piston-cylinder means 17 is achieved.
  • the stroke of the advancing piston-cylinder means 10 and the stroke of the stabilizer means 17 must be precisely proportional to one another in terms of the right triangle relationship shown in order that after the forward advance over the distance 10', the maximum effective length of the stabilizer means 17 will be such that the hypotenuse distance in question will be achieved and thereby the two frames maintained in parallel vertical relationship.
  • the stabilizer piston-cylinder means and the advancing piston-cylinder means may be connected to a common hydraulic pressure source, and as used herein, the term hydraulic is meant to include not only hydraulic fluid in a strict sense but also generally pneumatic fluid as well.
  • a common hydraulic pressure source By common connection to a given hydraulic flow source, simultaneous actuation of both piston-cylinder means will be attained in accordance with the invention such that at the end of the stroke of the advancing means, the stroke of the stabilizer means will be completed as well, whereby the minimum and maximum effective lengths of the stabilizer means will be attained depending upon whether the advancing means has been actuated to advance one frame with respect to the other (see the phantom portion of.
  • each frame is provided with its own control block in the prior art manner, as the artisan will appreciate, such control block containing valve control means for achieving the simultaneous actuation of both piston-cylinder means whereby the operator in the vicinity may perform each advancing step. Nevertheless, if desired, the entire automatic advancing cycle may be attained, including not only the energizing of the advancing cylinder and of the stabilizer cylinder in the desired reciprocating manner, but also the appropriate energizing of the props in each frame in the known manner to release from and engage in supporting disposition with the mine roof the particular prop frame in question.
  • Automatic means for achieving sequence cycle controlled advance is covered in a copending application, U.S. Ser. No. 523,502, filed Jan. 19, 1966, (corresponding to German applications G 42622 and G 42952), having the same assignee as the present application, the content of which copending application is hereby incorporated herein by reference.
  • a control block containing valve control means separately for the advance piston-cylinder means may be provided independently of the control block containing valve control means for controlling the stabilizer piston-cylinder means of the invention, so long as such means may be operatively interconnected for simultaneous energizing and so long as the operator manually or other wise may initiate the valve control in both instances to attain the simultaneous reciprocal energizing of the ad vancing piston-cylinder means and the stabilizer pistoncylinder means.
  • auxiliary control means for the stabilizer means may be, of course, disposed in the same control block as that containing the main valve control means for achieving the simultaneous flow of hydraulic fluid to the advancing piston-cylinder means and the stabilizer pistoncylinder means, the purpose of the auxiliary valve control means being, as aforesaid, to correct deviations from the normal desired parallel relationship of the frames.
  • one frame will be in engagement with the mine roof and mine floor and such frame will be used for bracing the other frame by means of the stabilizer means until such other frame is set, straightened up by the stabilizer means, and then extended into engagement with the mine roof and mine floor.
  • first frame is considered at an undesired angle with respect to the mine floor and mine ceiling, then such first frame can be set in the same way, whereupon both frames will be disposed in the desired relation with respect to one another and with respect to the mine roof and mine floor.
  • first frame can be set in the same way, whereupon both frames will be disposed in the desired relation with respect to one another and with respect to the mine roof and mine floor.
  • stepwise means e.g., reciprocal operating small correcting piston-cylinder means
  • stepwise means e.g., reciprocal operating small correcting piston-cylinder means
  • a stroke which is adaptable to the size of the advancing step indigenous to the particular advancing piston-cylinder means stroke utilized.
  • correcting cylinders including the necessary valve control system, are less expensive than corresponding compensating devices employed in the past with regard to rigid links, or the like, interconnecting adjacent props of a pair of frames for stabilizing purposes.
  • an appropriate further stabilizer means shown in the form of a pistoncylinder means 24, may be provided for more accurate stabilizing control of vertical disposition of the prop frames, both the stabilizer means 17 and the stabilizer means 24 being preferably positioned halfway up the frame, i.e., at about midheight, or at the upper end portions of the particular props of the frame to which the stabilizer means in question is connected.
  • the connection of the stabilizer means to the props will be by way of a swinging connection or swivel connection to permit the parallelogram disposition of the arrangement to be achieved with respect to the horizontal.
  • the stabilizer means in the starting position, i.e., prior to the advancing stroke of the advancing piston-cylinder means, will be disposed at right angles to the prop frames and the prop frames themselves will be disposed in precise side-by-side relation with neither substantially extending past the appropriate end of the other.
  • control blocks are shown schematically at 22 and 23 on prop frames 2 and 3, respectively.
  • These control blocks may house control valve means for the hydraulic flow to the advancing piston-cylinder means 10 and the stabilizer piston-cylinder means 17, as well as the stabilizer piston-cylinder means 24 which may be optionally provided.
  • Such control blocks may also house control means for energizing the hydraulic props 4, and 6, 7, whereby to permit extension and retraction of the prop frames for the desired roof support. While the source of hydraulic fluid and the specific flow lines therefor are not shown, these are conventional, as the artisan will appreciate, the present invention being directed to the dimensional relationships of reciprocal strokes of the advancing means and the stabilizer means for the desired purposes.
  • the stabilizer piston-cylinder means must be so designed that at the maximum advance of the advancing means, the stabilizer means must have executed the longest stroke possible and the maximum length attained thereby must be equal the hypotenuse of the right triangle indigenous to the prop alignments of the prop frames in the manner of the invention. If for some reason the props of the frames are not arranged at equal height, as for example, in a mineway in which the mine roof and the mine floor converge toward one another, the connection of the stabilizer means to the appropriate props will be correspondingly offset, yet the stabilizer means in the starting position will remain at right angles to the frames while the frames themselves will be disposed in exactly side-byside relation. To the extent of any deviation from such positional arrangement, the prop frames will correspondingly deviate from their desired substantially parallel and substantially vertical disposition with respect to one another.
  • the present invention represents an improvement in an advanceable mining prop arrangement including a first prop frame and a second prop frame disposed in substantially parallel vertical longitudinal planes, each said frame having a pair of spaced apart extensible and retractable upright mining props interconnected at their upper end portions by a roof cap and at their lower end portions by a base skid, piston-cylinder advancing means having a predeterimned amplitude maximum stroke including an advancing piston connected to one said frame and an advancing cylinder connected to the other said frame, said advancing piston and cylinder being operatively interconnected for relative advance with respect to one another a given distance corresponding to said maximum stroke in the longitudinal direction of said parallel planes to advance in turn the corresponding prop frame connected thereto with respect to the remaining prop frame, and adjustable length stabilizer means interconnecting a prop on one said frame with a correspondingly adjacent prop on the other said frame at a level spaced above the level of connection of said advancing means with said prop frames.
  • Such improvement specifically comprises providing said stabilizer means in the form of a stabilizer piston-cylinder means having a predetermined minimum effective length when said props to which said stabilizer means is connected and said stabilizer pistoncylinder means are disposed in a transverse substantially vertical plane normal to said frames and in turn said parallel planes and a predetermined maximum effective length when said props to which said stabilizer means is connected and said stabilizer piston-cylinder means are disposed in a transverse substantially vertical plane at an angle to said frames and in turn said parallel planes upon one said frame being correspondingly advanced with respect to the remaining frame said given distance corresponding to said advancing means maximum stroke, the maximum stroke of said stabilizer piston-cylinder means being proportional to the maximum stroke of said advancing piston-cylinder means, and said stabilizer means and said advancing piston-cylinder means being simultaneously energized, such that the maximum stroke of said advancing means will cause advance of one said prop frame with respect to the remaining prop frame said given distance while the maximum stroke of said stabilizer means simultaneously carried out therewith will cause corresponding parallel vertical alignment of said prop frames with respect to one another
  • the present invention relates to an advanceable mining prop arrangement which comprises first prop means, including a normally upright first prop, and second prop means, including a normally upright second prop, disposed correspondingly in substantially vertical and substantially parallel planes extending in a given longitudinal direction; energizable reciprocal advancing means having a maximum stroke of predetermined amplitude, including a first motive part and a second motive part, said motive parts being operatively interconnected and energizable for linear displacement with respect to each other in the longitudinal direction of said planes in dependence upon said stroke of predetermined amplitude, said first prop means being connected, at a point thereon remote from the upper end portion of said first prop, to said first motive part for linear displacement therewith and said second prop means being connected, at a point thereon remote from the upper end portion of said second prop, to said second motive means for linear displacement therewith; and energizable adjustable length stabilizer means having a predeterimned minimum and maximum effective length relative to the amplitude of said advancing means
  • the advancing means includes a hydraulically energized advancing piston-cylinder means in which said first motive part is an advancing piston rod carrying an advancing piston thereon and said second motive part is an advancing cylinder slidably receiving therein said advancing piston whereby to change the effective length of said advancing piston-cylinder means
  • said stabilizer means includes a hydraulically energized stabilizer piston-cylinder means in which said first linear part is a stabilizer piston rod carrying a stabilizer piston thereon and said second linear part is a stabilizer cylinder slidably receiving therein said stabilizer piston whereby to change the effective length of said stabilizer piston-cylinder means, said advancing piston-cylinder means and said stabilizer piston-cylinder means being concordantly energizable simultaneously to achieve infinitely incremental proportional changes in length thereof whereby to maintain in any position thereof the inherent relation of base, height and hypotenuse of said planar triangle up to the maximum stroke of said advancing means.
  • valve control means for hydraulic energizing of said advancing means and said stabilizer means are disposed on one of said prop means.
  • the first prop means includes a first prop frame having a first roof cap and a first base skid as well as a first pair of spaced apart props including said first prop and a third prop extending between said first cap and skid
  • said second prop means includes a second prop frame having a second roof cap and a second base skid as well as a second pair of spaced apart props including said second prop and a fourth prop extending between said second cap and skid, all of said props being extensible and retractable to change the effective supporting height of said frames, said frames being disposed correspondingly within said parallel planes, said advancing cylinder being connected to said first prop means, said advancing piston rod being connected to said second prop means, said first and second props being disposed at the same corresponding ends of said frames, and said stabilizer means being connected pivotally at one end to said first prop and at the other end to said second prop at connecting points upwardly spaced from said skids and said advancing means.
  • pref erably hydraulic fluid is used for energizing said advancing means and said stabilizer means and common valve means are provided to conduct said fluid from a common source simultaneously to both said advancing means and said stabilizer means to achieve proportionate concordant energizing thereof.
  • optional auxiliary control means may be provided to conduct hydraulic fluid separately to said stabilizer means to energize said stabilizer means independently of the energizing of said advancing means, for achieving minor correction of the disposition of said prop frames in exceptional cases.
  • one prop frame will be extended to a lesser height than the other whereby to achieve support of the mine roof.
  • hydraulic jacks including a stationary base part and an extendable and retractable upper part telescopingly received in said base part, are used as the mining props to which the stabilizer means of the invention is connected, if the level of connection is such that the stabilizer means is disposed on the base part of the particular hydraulic jack, then the relative horizontal disposition with respect to the mine floor will be maintained, despite any discrepancy in extendable length of the upper parts of the two props or jacks in question.
  • any discrepancy in the distance of extension of the upper part of one prop or jack with respect to the other will be meaningful, and in this instance, assuming the distance between the props and/or the prop frames and/ or the parallel planes thereof, is not changed, then adjustment means may 'be provided to change the minimum and maximum effective length of the stabilizers. In this way, linear compensation may be made for the change with respect to the horizontal, i.e., the mine floor in the angular disposition of the stabilizer means caused by the discrepancy in extended distance as between the two props.
  • Such adjustment means may take the form of infinite or incremental variations in effective length of piston rod 21 and/or link arm 19, such as where either or both of these parts are provided as telescoping sub-parts or overlapping sub-parts interconnected by set screws, bolts, or otherwise, as the artisan will appreciate, whereby manual adjustments may be made in the effective length of piston rod 21 and/ or link arm 19 by simply changing the set screw or bolt setting interconnecting the sub-parts.
  • cylinder .18 may be fashioned with an auxiliary cylinder chamber on the opposite end from the main cylinder chamber within which piston 20 is received.
  • link arm 19 may be provided with an auxiliary piston at the end thereof slidably and operatively received within the auxiliary chamber, with separate adjustable actuation of the resulting auxiliary piston-cylinder means to vary in increments the over-all effective length of the stabilizer means in question.
  • the change in effective length of the stabilizer means is undertaken in order to adjust to particular mining conditions and/ or to adjust to a change in the maximum stroke of the advancing means utilized consonant therewith.
  • a single adjustment in the change of effective length of the stabilizer means is contemplated rather than a constant or continuous adjustment, and where such adjustment is occasioned by a bedding condition in which the mineroof and the mine floor converge toward one another, such adjustment will compensate for the deviation from the theoretical horizontal position at which the stabilizer means is normally disposed, caused by differences in extended length of the props in question.
  • an alternate manner of compensation may be undertaken by actually changing the axial position of connection of the appropriate portion of the stabilizer means to the particular prop upper part in question. The latter may take place, for example, where the connection is by way of a collar mounted fixedly on the prop upper part, permitting rotation about the axis thereof for swinging the stabilizer means as desired yet preventing axial displacement thereof.
  • planar triangle may deviate from the normal horizontal plane of the mine floor, in such an instance, the proportional relationship of the planar triangle dimensions will be maintained, assuming that the difference in extended length of the upper parts of the props in question will be constant.
  • any changes in this regard may be compensated for by the discussed modification constructions, i.e., changing the axial position of the collar connection on the particular upper part or parts and/or changing the effective length of the stabilizer means by the use of sub-parts, and the like.
  • the construction of the present invention is versatile and thus usable in any instance where roof support is desired and where the vertical disposition of a pair of adjacent props for achieving such support is important, before, during and after the selfpropelled advancement of the props.
  • Advanceable mining prop arrangement for supporting a mine roof which comprises a first prop unit and a second prop unit substantially parallel with respect to said first prop unit, said prop units being arranged in a first supporting position side by side in a direction normal to the direction of advance, guiding and energizable advancing means for shifting said first and said second prop units, one with respect to the other, along a linear path in the direction of advance to a second supporting position, said advancing means including motive parts operatively interconnected and connected with said prop units, energizable stabilizer means including at least one pistoncylinder device for supporting said first and second prop units in substantially aligned upright parallel disposition with respect to one another in the first and second supporting positions, the piston rod of said piston-cylinder device being pivotally connected with a part of said first prop unit and the cylinder thereof being pivotally connected with a part of said second prop unit so that the piston-cylinder device may swing when the first and second prop units are successively shifted along said linear path in the direction of advance, said stabilizer pistoncylinder device being connected with the first
  • said advancing means include a double-acting hydraulic pistoncylinder unit and said stabilizer means include a hydraulic piston-cylinder device, and said control means include valve control means common to said piston-cylinder unit and said piston-cylinder device to control the supply of hydraulic fluid under pressure from a common source to said piston-cylinder device and said piston-cylinder unit.
  • valve control means for hydraulic energizing of said advancing means of said stabilizer means are disposed on one of said prop units.
  • auxiliary valve control means are provided to conduct hydraulic fluid separately to said stabilizer means to energize said stabilizer means independently of the energizing of said advancing means.
  • Advanceable mining prop arrangement which comprises first prop means and second prop means disposed in substantially upright parallel relation and advanceable in a longitudinal direction from a first substantially side by side coadjacent position to a second substantially staggered longitudinally offset position, energizable advancing means operatively interconnecting said first and second prop means for advancing said first and second prop means with respect to one another in said longitudinal direction alternately between said first and second positions, energizable stabilizer means having a predetermined minimum and maximum effective length including a piston-cylinder means having cooperating cylinder and piston parts with a stroke corresponding to said minimum and maximum effective lengths and operatively swingably interconnecting said first and second prop means apart from the operative connection thereof by said advancing means, said piston-cylinder means being arranged in said first position with the longitudinal axis thereof substantially normal to said longitudinal direction of advance and with said stabilizer means having said minimum effective length and in said second position with said longitudinal axis at an acute angle to said direction of advance and with said stabilizer means having said maximum effective length whereby to
  • Advanceable mining prop arrangement which comprises first prop means and second prop means disposed correspondingly in substantially vertical and substantially parallel planes extending in a given longitudinal direction; energizable reciprocal advancing means having a maximum stroke of predetermined amplitude, including a first motive part and a second motive part, said motive parts being operatively interconnected and energizable for linear displacement with respect to each other in the longitudinal direction of said planes in dependence upon said stroke of predetermined amplitude, said first prop means being connected, at a point thereon remote from the upper end portion thereof, to said first motive part for linear displacement therewith and said second prop means being connected, at a point thereon remote from the upper end portion thereof, to said second motive means for linear displacement therewith; and energizable adjustable length stabilizer means having a predetermined minimum and maximum effective length relative to the amplitude of said advancing means, including a first linear part and a second linear part, said first linear part being swingably connected at one end thereof to said first prop means at a point thereon remote
  • said advancing means includes a hydraulically energized advancing piston-cylinder means in which said first motive part is an advancing piston rod carrying an advancing piston thereon and said second motive part is an advancing cylinder slidably receiving therein said advancing piston whereby to change the effective length of said advancing piston-cylinder means
  • said stabilizer means includes a hydraulically energized stabilizer piston-cylinder means in which said first linear part is a stabilizer piston rod carrying a stabilizer piston thereon and said second linear part is a stabilizer cylinder slidably receiving therein said stabilizer piston whereby to change the effective length of said stabilizer piston-cylinder means, said advancing piston-cylinder means and said stabilizer pistoncylinder means being concordantly energizable simultaneously to achieve infinitely incremental proportional changes in length thereof whereby to maintain in any position thereof the inherent relation of base, height and hypotenuse of said planar triangle up to the maximum stroke of said advancing means.
  • valve control means for hydraulic energizing of said advancing means and said stabilizer means are disposed on one of said prop means.
  • said first prop means includes a first prop frame having a first roof cap and a first base skid as well as a first pair of spaced apart props including a first prop and a third prop extending between said first cap and skid
  • said second prop means includes a second prop frame having a second roof cap and a second base skid as well as a second pair of spaced apart props including a second prop and a fourth prop extending between said second cap and skid, all of said props being extensible and retractable to change the effective supporting height of said frames, said frames being disposed correspondingly within said parallel planes, said advancing cylinder being connected to said first prop means, said advancing piston rod being connected to said second prop means said first and second props being disposed at the same corresponding ends of said frames, and said stabilizer means being connected pivotally at one end to said first prop and at the other end to said second prop at connecting points upwardly spaced from said skids and said advancing means.
  • auxiliary valve control means are provided to conduct hydaulic fluid separately to said stabilizer means to energize said stabilizer means independently of the energizing of said advancing means.
  • piston-cylinder advancing means having a predetermined amplitude maximum stroke including an advancing piston connected to one said frame and an advancing cylinder connected to the other said frame, said advancing piston and cylinder being operatively interconnected for relative advance with respect to one another a given distance corresponding to said maximum stroke in the longitudinal direction of said parallel planes to advance in turn the corresponding prop frame connected thereto with respect to the remaining prop frame, and adjustable length stabilizer means interconnecting a prop on one said frame with a correspondingly adjacent prop on the other said frame at a level spaced above the level of connection of said advancing means with said prop frames, the improvement which comprises providing said stabilizer means in the form of a stabilizer piston-cylinder means having a predetermined minimum effective length when said

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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)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
US673520A 1965-02-22 1967-10-06 Advanceable mining prop arrangement containing stabilizer means Expired - Lifetime US3415065A (en)

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DEG0042902 1965-02-22

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US (1) US3415065A (cs)
BE (1) BE676776A (cs)
FR (1) FR1467502A (cs)
GB (1) GB1132252A (cs)
NL (1) NL6602192A (cs)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB947252A (en) * 1961-03-24 1964-01-22 Gewerk Eisenhuette Westfalia Self-advancing roof support frame assemblies for face galleries in mines
DE1161834B (de) * 1962-06-14 1964-01-30 Gewerk Eisenhuette Westfalia Selbsttaetig rueckbares Ausbaugestell fuer bergmaennische Gewinnungsbetriebe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB947252A (en) * 1961-03-24 1964-01-22 Gewerk Eisenhuette Westfalia Self-advancing roof support frame assemblies for face galleries in mines
DE1161834B (de) * 1962-06-14 1964-01-30 Gewerk Eisenhuette Westfalia Selbsttaetig rueckbares Ausbaugestell fuer bergmaennische Gewinnungsbetriebe

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FR1467502A (fr) 1967-01-27
BE676776A (cs) 1966-08-22
NL6602192A (cs) 1966-08-23
GB1132252A (en) 1968-10-30

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