US3537754A - Apparatus for moving a mining machine relative to a face being worked - Google Patents

Apparatus for moving a mining machine relative to a face being worked Download PDF

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US3537754A
US3537754A US769648A US3537754DA US3537754A US 3537754 A US3537754 A US 3537754A US 769648 A US769648 A US 769648A US 3537754D A US3537754D A US 3537754DA US 3537754 A US3537754 A US 3537754A
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machine
jack
face
gripping
hand
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English (en)
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Alfred Valantin
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Charbonnages de France CDF
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Charbonnages de France CDF
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
    • E21C29/02—Propulsion of machines for slitting or completely freeing the mineral from the seam by means on the machine exerting a thrust against fixed supports

Definitions

  • FIG. 22 ' APPARATUS FOR MOVING A MINING MACHINE RELATIVE TO A FACE BEING WORKED 1 Filed Oct. 22, 1968 10 Sheets-Sheet 8 A. VALANTIN 3,537,754 ov A MINING MACHINE RELATIVE A E BEING WORKED Nov. 3, 1970 APPARATUS F0 Filed 001.,22, 1968 10 Sheets-Sheet 9 FIG. 22
  • the present invention relates to devices for the displacement of an ore-mining machine along the cutting face, while being supported on a longitudinal guide of rigid elements of constant section, held fixed at least momentarily with respect to said cutting face, said devices comprising at least one double-acting jack and at least a pair of jaws located on each side of said longitudinal guide, one of said jaws being free in orthogonal translation while the other is coupled to one element of the jack, the other element being rigidly coupled to the machine, and means for successively. and alternatively bringing closer together and separating said jaws in synchronism with the alternative movements of said jack.
  • the machine is towed, by means of a winch installed on the machine itself, along a chain stretched between two fixed points located at the extremities of the cutting face;
  • the machine is drawn by a chain winding on a winch installed at an extremity of the cutting face.
  • the present invention relates to devices more particularly adapted to displace the machine along a cutting face
  • the translation of the machine with the devices in accordance with the invention is efiected by taking a support on a line of rigid elements of constant section (known as the longitudinal guide) held fixed, at least momentarily with respect to the said cutting face, by means of at least one double-acting jack, one of the elements of which is rigidly coupled to the said machine while the other element is supported on the said longitudinal guide by means of a gripping device having two positions, a gripping position and a sliding position, by first causing simultaneously the clamping movement of the said gripping device and one of the times of operation of the said jack and then simultaneously the sliding movement of the said gripping device and the other time of operation of the said jack.
  • the translation of the machine is effected by means of two gripping devices.
  • the translation of the machine is effected by means of two gripping devices acting simultaneously, either in the gripping position or in the sliding position.
  • the translation of the machine is eifected by means of two symmetrical gripping devices acting simultaneously and in a reversible manner, one in the gripping position, the other in the sliding position.
  • the said longitudinal guide is associated with the conveyor which evacuates the products out by the machine.
  • the longitudinal guide is constituted by all the protecting tubes of the return side of the haulage chain with which each hopper of an armoured scraped conveyor is normally equipped.
  • the longitudinal guide is associated with a supporting assembly.
  • the invention relates to devices for carrying the above displacement.
  • the device is essentially composed of at least one double-acting jack and at least one gripping device, known in the text which follows as a gripping hand, which is associated with it, and is characterized in that:
  • the gripping hand comprises a body and two jaws, known in the text which follows as the lower jaw and the upper jaw, located on each side of the longitudinal guide, one jaw being free in orthongonal translation while the other is coupled to one of the elements of the jack, the other element of the jack being rigidly coupled to the machine which is to be moved; and
  • the said means for successively bringing together and separating the jaws are constituted by jamming devices.
  • the said means are constituted by hydraulic clamping devices.
  • the said means for successively bringing together and separating the jaws are constituted by:
  • a first fiat jamming face coupled rigidly to one of the jaws
  • a second jamming face rigidly coupled to the other jaw grooved with transverse imprints, forming with the first flat jamming face, pairs of secant planes converging in the same direction;
  • Means of any type known per se for continuously urging each roller in the direction of convergence of the planes of the said pairs of secant planes;
  • Means being provided for periodically reversing the direction of translation of the rod of the double-acting jack with respect to the body of the said jack.
  • the body of the double-acting jack is coupled for translation to the grooved face of the said transverse imprints.
  • the said transverse imprints are symmetrical and a selector device is provided for urging the rollers into one or the other of the directions of convergence of the said secant planes.
  • the angle of convergence of the secant planes is substantially 12.
  • the body of the gripping hand has the form of a C enclosing the longitudinal guide
  • the lower part of the body of the gripping hand forms the lower jaw
  • the internal face of the upper part of the body of the gripping hand constitutes the said second jamming face
  • the upper jaw is located between the longitudinal guide and the said second jamming face
  • the face of the upper jaw located facing the second jamming face constitutes the said first jamming face
  • the body of the double-acting jack is coupled for translation to the body of the gripping hand;
  • the means for urging the rollers in one or the other of the directions of convergence of the pairs of secant planes are constituted, in a manner known per se, by a cage mounted between the jamming faces, provided with transverse stays located on each side of the rollers and each provided with spring push-rods acting in opposite directions;
  • a selector device is provided for placing the said cage in such manner that the rollers are in contact either with the push-rods acting in one direction or with the pushrods acting in the other direction;
  • the means for periodically reversing the direction of translation of the piston of the double-acting jack with respect to the body of the said jack are constituted by a four-way hydraulic fluid distributory with two positions, and devices, of any type known per se, for detecting the end-of-travel positions of the piston of the said jack and for controlling the change of the position of operation of the hydraulic distributor.
  • the device for carrying into effect the method according to the invention comprises two gripping hands as defined above, and has the following characteristics:
  • the pistons of the double-acting jacks are coupled for translation by means of a synchronizing rod extending between the bodies of the said jacks;
  • the bodies of the double-acting jacks are coupled in translation in opposite directions by means of a chain winding over two pulleys located on each side of the two gripping hands, one of the straight sides of the chain being connected in translation to one of the bodies of the double-acting jacks, the other straight side of the chain being coupled in translation to the other body of the double-acting jack, the shafts of the pulleys being fixed to the body of the machine;
  • Means are provided for placing the cages in such manner that the spring push-rods urge the rollers of the two gripping hands in the same direction;
  • the double-acting jacks are supplied with hydraulic fluid by means of a four-way two-position distributor and two piping systems each opening into the bodies of the said jacks, symmetrically with respect to the centre of the synchronizing rod.
  • the said means for successively bringing together and separating the jaws are constituted by hydraulic clamping devices, comprising:
  • At least one single-acting jack rigidly coupled to the other jaw
  • the body of the gripping hand has the form of a C surrounding the longitudinal guide;
  • the lower part of the body of the gripping hand forms the lower jaw
  • the internal face of the upper part of the body of the gripping hand constitutes the said clamping face
  • the upper jaw is hollowed out with at least one imprint, in which slides the piston of the single-acting jack;
  • the body of the double-acting jack is coupled in translation to the body of the gripping hand;
  • the means for periodically reversing the direction of translation of the piston of the double-acting jack with respect to the body of the said jack are constituted by a hydraulic fluid distributor with four ways and two positions, and devices of any type known per se for detecting the end of travel positions of the piston of the said jack and to control the change in position of operation of the hydraulic distributor;
  • the means for simultaneously applying the pressure to the single-acting jack and to one of the sides of the doubleacting jack are constituted by three-way distributor with two positions hydraulically actuated by the supply circuit of the double-acting jack;
  • a selector device is further provided so as to apply simultaneously a pressure on the single-acting jack and on one of the sides of the double-acting jack, or simultaneously on the single-acting jack and on the other side of the double-acting jack.
  • the device for carrying into effect the method according to the invention comprises two gripping hands of the hydraulic type described above, and having in addition the following characteristics:
  • the pistons of the double-acting jacks are coupled in translation by means of a synchronizing rod extending between the bodies of the said jacks;
  • the bodies of the double-acting jacks are coupled together in translation in opposite directions by means of a chain which winds over two pulleys located on each side of the two gripping hands, one of the straight sides of the chain being coupled in translation to one of the doubleacting jack bodies, the other straight side of the chain being coupled in translation to the other double-acting jack body, the shafts of the pulleys being fixed on the body of the machine;
  • the double-acting jacks are supplied with hydraulic fluid by means of a four-way distributor with two positions and two conduit systems each opening into the bodies of the said jacks, symmetrically with respect to the centre of the synchronizing rod;
  • Means are provided for simultaneously applying a pressure on the single-acting jack of one of the gripping hands and on one of the conduit systems opening into the doubleacting jack bodies and then simultaneously on the singleacting jack of the other gripping hand and on the other conduit opening into the double-acting jack bodies.
  • FIGS. 1 and 2 are two views in cross-section of a form of construction of the gripping hand
  • FIG. '3 is a plan view of the push-rod cage
  • FIGS. 4 to 9 show diagrammatic views of the forwardmovement mechanism of the gripping hand
  • FIGS. 10 and 11 are two views in cross-section of another form of construction of the gripping hand
  • FIG. 12 is a plan view of the push-rod cage associated with the gripping hand
  • FIG. 13 is a view in longitudinal section of a preferred form of construction of the device for the semi-continuous displacement of the machine
  • FIGS. 14 to 18 show diagrammatic views of the forward movement mechanism of the machine, obtained by means of the device shown in FIG. 12;
  • FIG. 19 shows a form of construction of the gripping hand with hydraulic clamping
  • FIGS. 20 and 21 give diagrammatic views of installations employing two gripping hands with hydraulic clamp-
  • FIG. 22 shows a machine-towing installation-in which the longitudinal guide is associated with the conveyor along which the machine is moved;
  • FIG. 23 shows a machine-towing installation in which the longitudinal guide is associated with a supporting assembly
  • FIGS. 24 and 25 show diagrammatic views of an alternative form of construction of the device shown in FIGS. 10, 11 and 12.
  • the assembly 1, known in the text which follows as a gripping hand, consists essentially:
  • the body of the double-acting gripping hand 2 is coupled in translation to the body 6 of a hydraulic jack 7 (FIGS. 4 to 9), the piston 8 of which is rigidly fixed by means of the rod to the machine M to be displaced along a longitudinal guide 9.
  • the longitudinal guide of constant section shown in the non-limitative form of a hollow cylindrical tube, is placed between the lower part 11 of the body of the gripping hand and the bed 3.
  • the lower part 11 of the body of the gripping hand cone stitutes what has been known as the lower jaw, while the bed 3 constitutes the upper jaw.
  • the jamming face 12 is hollowed out with transverse imprints 13, each forming a portion 14 of a plane forming with the jamming face 15 a small angle, preferably about 12.
  • the jamming face 15 and each of the planes 14 form what has been known as a pair of secant planes; all the 6 pairs of secant planes 14-15 converge in the same direction f.
  • a roller 4 is placed in the hollow of each imprint 13. Its diameter is greater than the maximum distance h separating the face 15 from the face 12.
  • the cage 5 is provided with as many pairs of spring push-rods 16 as there are rollers, the push-rods being mounted in the cross-braces 17.
  • Each pair of push-rods 16 continuously urges a roller in the direction of convergence f of the pairs of planes 14-15.
  • the rollers 4 separate the bed 3 from the upper part of the body of the gripping hand 2 by means of the inclined planes 14 until they are locked be tween the plane 14 and the lower face 15 of the bed 3 or, which comes to the same thing, cause the relative approach (arrows f FIG. 1) of the bed 3 (or upper jaw) and the lower jaw 11, until these two elements grip the guide-tube 9 without slipping.
  • the jack body 6 drives the gripping hand body 1 in translation in the direction 1, at the same time releasing the rollers 4 and freeing the jaws 11 and 3.
  • the gripping hand free in translation with respect to the guide 9, moves with respect to this guide and to the machine M, remaining stationary, over a distance approximately equal to the travel d of the piston 8 (FIG. 9).
  • the device described thus carries out a discontinuous movement of translation of the machine in the direction (arrow F) of convergence of the pairs of planes 14-15, and over a length approximately equal to the travel of the piston. It is clear that reversal of the direction of application of the hydraulic pressure on the jack 7 between the forward-movement period and the return period on the one hand, and the return-period and the forwardmovement period on the other, must be efffiected automatically, for example by means of detectors (not shown) of the extreme positions of the piston '8 (end of extension and end of withdrawal), the said detectors controlling the operation of the hydraulic distributor 18 of the type having four ways and two positions of use.
  • two gripping hands comprising pairs of planes converging in opposite directions 3 and f, everything else remaining unchanged, and one or the other of the jacks coupling the machine to each gripping hand, is put under pressure.
  • the jamming face 12 is hollowed out with symmetrical transverse imprints 19 in the shape of a V with the point upwards, the push-rod cage being provided with pairs of push-rods 16, 16' acting in opposite directions 1, f.
  • the planes 15 and 14 converge in the directions 1 and the planes 15 and 14 converge in the direction f.
  • a selector device determines the direction of movement of the machine M by imposing the direction in which the rollers 4 are continuously urged.
  • the selector device is a pillar 20 rigidly fixed to the cage 5 and capable of assuming two positions fixed with respect to the body of the gripping hand, located on each side of the abutment constituted by the transverse lever 21 articulated on the body of the gripping hand, so that, for the fixed position 206 (see FIG. located to the left of the lever 21, the rollers 4 are urged in the direction of convergence 1 of the pairs of secant planes -14 and, for the other fixed position D (drawn in broken lines in FIG. 10) located on the right of the lever 21, the rollers 4 are urged in the direction j (opposite to j) of convergence of the pairs of secant planes 15-14'.
  • FIG. 13 shows a view in longitudinal section of a preferred form of construction of the device according to the invention.
  • This form of construction utilizes two gripping hands with a face 12 having transverse symmetrical imprints 19.
  • Each gripping hand body 1G, 1D is coupled for translation to the body 66, GB of a double-acting jack,
  • the pistons 86 and SD of the jacks are coupled together by a synchronizing rod 22, each piston being furthermore fixed on the machine M by means of the driving elements 106 and 10D.
  • Two longitudinal channels 23 and 24 are pierced in the synchronizing rod 22 and in the pistons 8G and 8D. They are symmetrical with respect to the centre of the assembly 8G-22-8D, and open:
  • Two pulleys 25 and 26, the shafts of which are fixed on the body of the machine M, are mounted on each side of the assembly comprising the two gripping hands 16 and 1D.
  • a endless chain 27 passes round the two pulleys, one of its straight sides being rigidly fixed on one of the jack bodies (point N6 of the body 66), while its other straight side is fixed to the other jack body (point ND of the body 6D).
  • the machine M and the hand 1G are moved in the same direction F as previously, up to the end positions shown in heavy lines in FIG. 18, for which the various elements are again found in the relative position shown in FIG. 14.
  • the machine M has again been displaced over a distance substantially equal to d, and the hand 16 over a distance substantially equal to 2d.
  • the chain 27 transmits to the jack body which effects the return period, the thrust applied by the jack controlling the ad- Vance period, which amounts to the same thing as saying that, in order to overcome a given force which opposes the movement of the machine, a thrust must be developed on the jack effecting the advance period, giving half the driving force necessary to overcome the resisting force.
  • the locked gripping hand is provided with self-regulation of its clamping etfect on the guide-tube 9.
  • the gripping hand assembly has a tendency to slip along the tube in the direction fmp opposite to the direction of movement F of the machine.
  • the body of the gripping hand 2 drives the rollers by friction in the direction 1, the rollers move up the sloping face formed by the planes 14, and there results an increase in the gripping force fs of the jaws 3 and 11.
  • the gripping hand is designed in an entirely hydraulic form.
  • FIG. 19 is a form of construction of the towing installation comprising a single gripping hand.
  • This latter form is distinguished from that shown in FIG. 1 by the fact that the approach movement of the jaws 3 and 11 is effected by means of at least one singleacting jack placed between the upper jaw 13 and the body 2 of the gripping hand.
  • FIG. 19 there can be seen three single-acting jacks 40, the pistons 41 of which come into contact with the body 2.
  • the internal face 39 of the upper part of the gripping hand body on which the pistons of the single-acting jacks are supported will be known as the clamping face.
  • jacks are supplied from a source of pressure P1, which may furthermore be the pressure source P which supplies the double-acting jack 7 serving to drive the machine M, by means of the conduit 42 and the distributor 43 of the type having three ways and two positions.
  • the distributor 43 is advantageously operated hydraulically by the jack 7 by means of the distributor 44 of the type with four ways and two positions with manual control and pilot conduits 45 and 46 connected in parallel with the conduits 47 and 48 coupling the distributor 18 to the jack 7, in such manner that:
  • the jacks 40 are connected to the tank R when the pressure P is applied to the conduit 47, from which results the displacement of the gripping hand in the direction opposite to F.
  • the manually-operated distributor 44 carries out the functions of an operation reversing :10 device, and corresponds to the selector device 20-21 shown in FIGS. 10 and 11.
  • FIG. 20 is a first form of embodiment of the towage installation comprising two synchronized gripping hands of the same kind as that shown in FIG. 13.
  • the gripping hand 1G is provided with single-acting jacks 406 and the gripping hand 1D is provided with single-acting jacks 40D.
  • the distributor 49 of the type with four ways and two positions is connected:
  • the jack 49 is hydraulically actuated by the combination of the jacks 7G and 7D by means of the conduits 45 and 46 and the distributor 44 of the manually controlled type with four ways and two positions, so that there is obtained one of the two following sequences:
  • the jacks 40G to the tank R which results in displacement of the machine M and the gripping hand 1G in the direction F.
  • the distributor 44 for reversing the direction of movement
  • the forward movement period is carried out without any random pulsations due, for example, to the elasticity of a chain; the mechanical elements are thus placed in the best conditions of use.
  • each element of the longitudinal guide should be held in a fixed position with respect to the cutting face.
  • each element may be associated with a pan of the armoured flexible conveyor 30, evacuating the products cut by the machine (see FIG. 22), the element being fixed to the outer side 31 of the pan by any means known per se, such as, for example, by bolting or welding.
  • each element is constituted by the protecting tube of the return side of the towing chain with which each pan of an armoured flexible conveyor, normally used as the sliding track of a winning machine of the plough type, is usually equipped.
  • each element may be fixed by any known means, on the main prop of a chock of stanchions forming part of a mine roof support assembly installed at the cutting face.
  • FIG. 23 the means for fixing the longitudinal guide is shown, without this having any limitative nature, by an angle-iron 32, welded on the one hand to the longitudinal guide element and bolted on the other hand to the main prop 33 of the chock 34.
  • FIGS. 22 and 23 are readily adaptable to rise-workings by equipping them with known means for keeping the machine parallel to the ground, or alternatively for installing the conveyor horizontally.
  • transverse imprints could be formed in the bed. This latter must be coupled in translation to the body of the jack, all other conditions remaining the same.
  • Modifications and improvements may also be applied to the means provided for continuously urging the rollers in the desired direction of convergence of the pairs of secant planes.
  • FIGS. 24 and 25 An alternative form of embodiment is shown in FIGS. 24 and 25.
  • the imprints 19 have the form of a trapezoidal isosceles prism.
  • Two rollers 4, 4 are installed in each imprint.
  • a spring is inserted between the adjacent rollers.
  • the springs 28 are inserted between the rollers 4 and 4' mounted in the imprints, while the springs 29 are inserted between the pairs of rollers.
  • the springs 28 have a tendency to apply the rollers 4 and 4' respectively against the inclined planes 14 and 14'.
  • the springs 28 and 29 pass through the cross-braces 17 of the cage 5.
  • the springs 28 are compressed and continuously apply the rollers 4 against the planes 14.
  • the active rollers are therefore the rollers 4 urged in the direction of convergence 1 of the pairs of secant planes 14-15.
  • the machine (not shown) will be displaced in the direction F, coincident with f.
  • the modifications may also be applied to the means for controlling the reversal of the position of operation of the hydraulic distributor 18, and which may be mechanical, hydraulic, electro-hydraulic or even electronic.
  • the longitudinal guide have a constant section other than circular.
  • a gripper for mining machine hauling apparatus including means for effecting relative movement between the gripper and a guide member, said guide member defining a generally rigid path of travel along which the hauling apparatus will be propelled, said gripper comprising in combination: a mining machine member, a pair of clamp assemblies each including a body having a piston chamber, said piston chambers being in a general axial alignment, jaw means on said bodies for releasably gripping the guide member,
  • said jaw means including directional-responsive actuating means for gripping and releasing said guide member in relation to relative movement of said bodies on said guide member,
  • a piston-and-rod means comprising an elongated rod terminally connected to said machine member and extending generally along the path of travel defined by said guide member,
  • said rod means extending axially through said piston chambers and including integral spaced piston respectively disposed in one of said piston chambers and defining variable-volume fluid chambers on opposite sides thereof, fluid pressure means connected to said variable volume chambers for optionally directing fluid pressure into the chambers to move the bodies relative to each other, with res ect to said guide member, and relative to said piston rod; and
  • said synchronizing means comprises a pair of spaced pulley members journalled on said machine member for rotation on an axis transverse to the path of movement of said machine member,
  • said synchronizing means comprises a pair of spaced pulley members journalled on said machine member for rotation on an axis transverse to the path of movement of said machine member,
  • said jaw means comprises a pair of spaced jaws, one of said jaws comprising a planar face, the other jaw comprising an angled cam face diverging toward said planar face, a casing displaceably mounted between said faces and having relative movement therebetween, said casing including roller means journalled in said casing and engageable with said cam face for being urged toward said planar face.
  • Structure as claimed in claim 8 including means normally urging said roller means toward said cam face.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)
  • Crushing And Grinding (AREA)
US769648A 1967-10-27 1968-10-22 Apparatus for moving a mining machine relative to a face being worked Expired - Lifetime US3537754A (en)

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Application Number Priority Date Filing Date Title
FR126239 1967-10-27

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US (1) US3537754A (fr)
BE (1) BE721791A (fr)
CA (1) CA918688A (fr)
DE (2) DE1805341A1 (fr)
FR (1) FR1548671A (fr)
GB (1) GB1222229A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753596A (en) * 1971-05-22 1973-08-21 Pitcraft Ltd Lognwall mining machine with chain driven propulsion
US3871277A (en) * 1974-02-25 1975-03-18 Robert Benjamin Bolton Tracked walking gear
US4099787A (en) * 1976-04-23 1978-07-11 Dresser Europe, S.A. Mining machine
US4134620A (en) * 1976-11-26 1979-01-16 Sipremec Channelling machine for cutting a preliminary groove around the working face of a tunnel
US4633723A (en) * 1983-01-11 1987-01-06 Gosadarstvenny Proektno-Konstruktorsky I Experimentalry Institut Agolnogo Mashinostroenia Chainless feed system of mining cutterloader

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1291427A (en) * 1970-05-15 1972-10-04 Coal Industry Patents Ltd Haulage apparatus for a mining machine
FR2356808A1 (fr) * 1976-07-02 1978-01-27 Gp Konstruk Systeme d'avance d'une abatteuse-chargeuse
GB1579484A (en) * 1977-03-15 1980-11-19 Coal Industry Patents Ltd Engagement devices
DE2855641A1 (de) * 1978-12-22 1980-07-10 Beukenberg Maschf Schreitwerk fuer eine gewinnungsmaschine
GB2126983A (en) * 1982-09-07 1984-04-04 Charles Hoyle A jack system
GB2150913A (en) * 1983-08-09 1985-07-10 Hugh Kane Self propelled carriage
GB8905202D0 (en) * 1989-03-08 1989-04-19 Qualter Hall & Co Ltd Power operated device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US850018A (en) * 1907-02-07 1907-04-09 Cornelius Kohlmyer Motor-vehicle.
US2391657A (en) * 1944-03-21 1945-12-25 Tavelin Jacob Erhard Train booster
US2581052A (en) * 1946-03-25 1952-01-01 Mavor & Coulson Ltd Haulage apparatus for mining machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US850018A (en) * 1907-02-07 1907-04-09 Cornelius Kohlmyer Motor-vehicle.
US2391657A (en) * 1944-03-21 1945-12-25 Tavelin Jacob Erhard Train booster
US2581052A (en) * 1946-03-25 1952-01-01 Mavor & Coulson Ltd Haulage apparatus for mining machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753596A (en) * 1971-05-22 1973-08-21 Pitcraft Ltd Lognwall mining machine with chain driven propulsion
US3871277A (en) * 1974-02-25 1975-03-18 Robert Benjamin Bolton Tracked walking gear
US4099787A (en) * 1976-04-23 1978-07-11 Dresser Europe, S.A. Mining machine
US4134620A (en) * 1976-11-26 1979-01-16 Sipremec Channelling machine for cutting a preliminary groove around the working face of a tunnel
US4633723A (en) * 1983-01-11 1987-01-06 Gosadarstvenny Proektno-Konstruktorsky I Experimentalry Institut Agolnogo Mashinostroenia Chainless feed system of mining cutterloader

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FR1548671A (fr) 1968-12-06
BE721791A (fr) 1969-04-03
DE1805339A1 (de) 1969-07-10
DE1805341A1 (de) 1969-05-14
GB1222229A (en) 1971-02-10
CA918688A (en) 1973-01-09

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