US1475888A - Loading machine for ores and the like - Google Patents

Description

Nov. 27 1923. 1,475,888

1'. E. RUNDQVIST LOADING MACHINE FOR ORES AND THE LIKE Filed Jan. 4. 1922 4 Sheets-Sheet 1 T. R. E. RUNDQVIST LOADING MACHINE FOR ORES AND THE LIKE Filed Jan. 4, 1922 4 Shoots-Sheet 3 Nov. 27,1923. 1,475,888-

T. R. E. RUNDQVIST LOADING MACHINE FOR ORES AND THE LIKE Fil 1922 4 Sheets-Sheet 3 Nov. 27 1923. v 1,475,888

1'. R. E. RUNDQVIST LOAbING MACHINE FOR ORES AND THE LIKE Filed Jan. 4. 1922 4 Shuts-Sheet 4 Patented Nov. 27, 1923.

STATES THORE ROBERT EUGEN RUNDQVIST, OF STOCKHOLM, SWEDEN.

LOADING MACHINE FOR GEES AND THE LIKE.

Application filed January 4, 1922.

To all whom it may concern Be it known that I, THORE Romain EUGEN R-unnovrsr, a. citizen of the Kingdom of Sweden, residing at Stockholm, Sweden, have invented a new and useful Loading Machine for Ores and the like, of which the following is a specification.

The object of this invention is to provide a machine for loading ores and the like into the cars of mine-tracks, whereby th difficult manual loading as hitherto used may be dispensed with.

One feature of the invention consists in providing a machine of the above said kind the main parts of which comprise a carriage frame having a vertically swinging bucket anda preferably pneumatic motor for effecting the swinging movement of the bucket, said motor being constructed with a vertical cylinder and being pivtoally mounted with the crank shaft and the supporting arms of the bucket by means of a vertical journal at one end of a supporting arm carried by the carriage frame and pivotally connected at its opposite end by means of a vertical journal to the carriage frame in order to permit lateral swinging motions both of the motor with its crank shaft carrying the bucket supporting arms around the said last mentioned journal and of the bucket supporting arms around the said first-mentioned journal.

In the drawings, two embodiments of the machine according to this invention are illustrated. Figs. 16 show one embodiment and Figs 713 show the other embodiment. Fig. 1 is a. vertical longitudinal section of the machine according to the said first-mentioned embodiment. Figs. 1 and 1 are details, Fig. 1 showing a section on the line ao in Fig. l and Fig. 1 showing a regulating cam. Fig. 2 is a diagrammatic plan view of said machine. Fig. 3 is a cross section of part of the motor on the line 38, Fig. 1, with the piston in its lowermost position. Fig. 4 is a cross section of the controlling slide valve of the motor. Figs. i, 4 and 4 show details. Figure 5 is a crosssectional view taken. in the planes indicated bythc broken lines 5-5 of Figure 4.

Figure 6 is a cross-sectional view taken in the planes indicated by the broken lines 66 of Figure 4; Fig. 7 is an elevation of the machine according to the second embodiment with a supporting arm shown in longitudinal section. Fig. 8 isa longitudinal Serial No. 527,022.

section of the mounting of the control lever. Figs. 9 and 10 show the cooperating end surfaces of the hub or hearing socket or sleeve of the control lever. Fig. 11 is a vertical section of the upper part of the cylin der and crank casing of the motor. Fig. 12 is a cross section of the slide valve for controlling the supply of power iiuid to the motor. Fig. 13 is a longitudinal section of'an additional control lever disposed on the side of the bucket supporting arms opposite to that at which the control lever shown in Fig. 8 is situated.

The machine according. to Figs. 1-6 oomprises a carriage frame 1, resting on-wheels 2 adapted to roll on tracks. The carriage frame is formed with a ballast space 171 and provided with a lock 17 2 to hold the machine against rotation to the rails. The frame 1 carries at its one end a bearing 3 for a vertical journal a. The latter is connected as by a horizontal, transversely extending journal 5 extending through an opening formed in the upper portionof the ournal 4, to one end piece 6 ofa frame composed of the two end pieces 6 and 8 and two longitudinal members 7. The end piece 8 carries a roller 9. resting on an arc-shaped part 10 of the frame 1 which is concentric to the journal 4:. The frame piece 8 is provided with a vertical boring forming a bearing for a cylindrical journal portion 11 of the casing of a preferably pneumatic motor, comprising a cylinder 12 forming a vertical extension of the journal member 11, a piston 13. a crank shaft lt and a crank casing 15. The journal 11 is hollow, closed at its lower end by a bottom 16 and communicates freely at its upperend with the crank casing and with the cylinder chamber below the piston. The crank casing is airtightly closed. The piston rod 17 is shaped to form a toothed rack meshing with a toothed segment 18 on the shaft 14. Formed on the inner surface of the casing is a shoulder 56 serving as a stop member for the sector 18. The above said boring of the journal 11 is shaped to form a guide-way for the piston rod during the last part of the downward motion of the latter and serves at the same time as a recep tacle to receive oil adapted both for lubrieating the movable parts of the motor when the piston rod plunges into the oil and sprays same and for the purpose of braking the downward motion of the piston. For the said last-mentioned purpose the bottom 16 is formed with an upstanding lip 19 adapted to nearly fill the space existing between the boring of the tap 11 and the pi"- ton rod 17 when the latter is in or near its lowermost position which space is due to the cut of the tops of the teeth on the toothed rack. Formed at the cover of the cylinder is an upstanding projection or stop 17 3.

Fig. 3 illustrates a cross section of the journal 11, the lip 19 and the piston rod 1. taken through a tooth of the latter. In this case the said narrow space is indicated at 170.

The crank shaft 14 carries outside of the crank casing two arms 20 carrying at their end remote from the crank shaft a bucket comprising an angularly shaped bottom 21 and two side walls 22 the bucket being open at its other sides. Extending across the arms is a belt 57.

From the foregoing description it is clear that the arms 20 with the bucket rotatable with the motor about the common axis of the cylinder and of the journal 11 due to the mounting of said journal 11 in the frame member 8. Furthermore, the frame 6, 7, 8 is rotatable about the axis of the journal 4 and thus both the frame 6, 7, 8 and the arms 20 may be moved to the side, as for instance, to the position shown in Fig. 2. The purpose of this movement will be hereinafter set forth. To enable this double turning movement to be effected by a single manipulation, the following provisions are made. Ri idly attached to the under side of the frame 1 is a guide pulley segn'icnt 23 arranged concentrically with respect to the journal 4 and serving to guide a rope, chain or the like 24:, which is attached to the guiding segment, placed around a guide pulley 25 and is crossed on both sides thereof, and is then placed around a pulley 26 rigidly attached to the journal 11. When 24 is a rope or Wire it is preferably rigidly attached to a point of the pulley 26 by means of a clamping screw 27 in order to prevent slipping. The guide pulley 25 and the crossing of the rope on both sides thereof serve to secure a reliable guiding of the rope within a limited space.

A sleeve shaped projection 59 of the easing of the motor communicates through a channel 60 with the interior of the crank casing. Slidably mounted in said projection is a stop pin 61 acted on by a tension spring 62 and adapted to cooperate with any of a semi-circle of apertures 63 formed in the frame portion 8. Said apertures are most clearly shown in Fig. l and are also indicated by dotted lines in Fig. 2. The purpose hereof will be hereinafter set forth.

The crank shaft 1-1- carries outside the crank casing beside the arms 20 also a cam 28, Figs. 1 and 1 Said cam com first cam surface 29, a concen ric port and a second cam surface 81. The cam 28 serves to control in a manner hereinafter set forth a slide valve for controlling the drivfiuid of the motor, which is assumed to be c mpressed air in the preferred embodiment. he slide valve diagrammatically shown at 32 in Fig. 1 and is more clearly illustrated in Figs. 4T6, where 32 indicates the valve casing, while 33 is the slide valve proper. The latter is shaped to form a rotary slide valve and is provided with an arm 34-, shown bydotted lines in Fig. 1 and more clearly illustrated in Figs. t and l. The arm 84 is formed with a lateral projection 84 adapted to be engaged by the cam 28. The inlets outlets controlled by the slide valve are shown in Figsl, 4t, 5, 6 where 35 indicates the inlet and 36 the outlet for compressed air, while 37 is the passage leading from the slide valve to the cylinder 12 and opening into the latter above the piston 13-. The slide valve is formed with two systems of passages, one of which. as shown in Fig. 5, comprises a single narrow, diametrically extending channel 39, the other passage, Fig. 6, comprising a diametrically extending channel 40 and a branch channel ll, the channels lO and 11 having a greater axial extension and consequently a larger cross section area than that of channel 89, as will appear from Fig. 1. The channel 39 only adapted in a given position of the slide valve to connect the inlet 35 to th passage 37, while the channel system 40, 11 serves t connect the passage 37 to the inlet 35 in a predetermined position of the slide and with the outlet 86 in another predetermined position of the slide. To open the slide provision is made of a hand control device comarising a rope transmission or the like 42 connecting the slide valve proper 33 to control arm 41-3 pivotally mounted adjacent to the bucket. To l the movement of said arm in provided on the bucket wall. The move ment of the slidev after the piston is set in motion is effected by means of the cam 29 above referred to.

The slide is provider. with means for con trolling the admission of compressed air to the motor according to the load on the bucket. Said controlling means comprises a piston a l, F 4;, sliding in a sleeve shaped extension 33 of the slide 33 and adapted to be operated on the one hand by compressed air through a channel 15, so positioned as to communicate with the passage 37 at the same time that the channel 39 connects the passage 37 to the inlet 35. lhepiston a4 is operated on the opposite side by a spring 16 surrounding the piston rod 41-7 and resting on a shoulder 18 formed in the sleeve 33 transversely extending pin 4-9, attached the sleeve and engaging in. a longitudinal t formed in the piston rod 47 permits 't in b one ClllGCtlOll a stop 100 is the displacement of the piston relatively to the slide while preventing rotation of the piston relatively to the slide. Outside of the sleeve 33 the piston rod 47 carries an angularly shaped arm 51 the outer preferably radial part 52 of which is adapted to cooperate with an inclined shoulder 54 on the inner surface of a rigid casing 53 surrounding the sleeve 33 Said inclined shoulder is indicated by dotted lines in Fig. 4 and is more clearly shown in Figs. 4 and 4. 55 indicates a pin for holding the rope 42.

The machine described is adapted for use on a mine track for loading ores and the like into cars on said track. In Fig. 2 part of the outline of such a car is indicated by the dotted lines 58. The letter P indicates the centre of said track.

The above described construction operates in the following manner:

The bucket arms 20 are adapted by rotation of the shaft 14 to be moved from the normal position shown in Fig. 1 to an approximately vertical position in which the arms 20 are stopped due tothe sector 18 and the arms striking the stops, 56 and 173 respectively.

At the beginning of the loading operation the bucket is first set in the most favorable loading position. If the material to be handled, as for instance, pieces of ore, are situated on the one side of the mine track, the bucket is moved to the side to the extent required whereupon the material is filled in any desired way into the bucket which is in its lowermost position. Due to the mount ing of the motor as described above and the operative connection by means of the rope 24 there will be at the same time obtained an outward movement of the motor, as indicated in Fig. 2. It is easily to see that the bucket arms will thus occupy a more suitable position for effecting the loading operation than would be thecase if the said arms were rotatable around a stationary shaft mounted at the middle of the frame, the path of movement of the material upon the vertical swinging movement being directed towards a point at the middle of the track situated at a distance from the machine supporting frame. The construction is so chosen that said point coincides with the centre of a mine car of well known construction, as is shown in Fig. 2.

The bucket having been set in the position. desired and filled with material to be loaded, the motor is started. To this end the hand lever 43 is rotated in the direction indicated by the arrow a (Fig. 1) into a fixed position 100 determined by a stop. This causes by means of the rope transmission 42 the valve slide 33 to be set into the position shown in Figs. 4 and 5. 2

Normally the members of the machine assume the position shown in Fig. 1. The

arm 34 of the valve 33 is now out of the path of the cam 28 on the shaft 14. The valve 33 may thus be freely rotated independently of the cam 28. To start the lifting operation of the machine the lever 43 is moved in the direction of the arrow a. till it strikes the stop 100. This causes a rotation of' valve 33 into the position illustrated in Figs. 4 and 5. Compressed air will now pass from inlet 35 through channel 39 and into the passage 37 and through the latter into the cylinder 12 above the piston 13. Part of the air will also pass from passage 37, through passage and into the boring of valve 33 behind the piston 44 therein, Fig. 4. The channel 39 is so narrow that the air acting on the upper face of the piston 13 will not move the piston appreciatively but will only effect a condition of balance between the piston 13 and the bucket with its load. As the same pressure acts on the piston 44 it is evident that the piston 44 will be i moved through a distance bearing a certain relative height to the said weight. The larger said weight the more the piston 44 will be displaced, see to the right of Figure 4.

The operator, when observing the said condition of balance, moves the lever 43 in the direction of the arrow 5 thereby also rotating the valve 33. This movement of the lever 43 is continued till the operator feels that the projection 52 on the valve 33 strikes the inclined surface 54. Accordingly as the valve 33 has been rotated more or less before the projection 52 strikes the stop 54 the passage of the compressed air to the cylinder 12 above the piston 13 has been opened more or less. In this movement of the valve 33 the arm 34 thereon has been moved into the path of the cam 28 yet Without coming into contact with the'latter which is still in the position shown in Figure 1. The compressed air now acting on the piston 13 moves same downwardly, and in this movement the cam 28 is rotated so as to operate the arm 34 thereby restoring the valve 33 to its closed position.

I would distinctly have it'understood that the striking of the stop 100 by arm 43 takes place when said arm is moved in the direction indicated by arrow (1, in Figure 1 while the movement of the lever 43 which is continued until the operator feels that the projection 52 on the valve 33 strikes the inclined surface 54 is the movement in the direction indicated by the arrow 7) in said Figure 1.

With the lever 43 and the slide in said position compressed air passes by way of channel 39, passage 37 and passage 45 and enters the space above the piston 44. The channel 39 is so narrow as to give rise to such a small acceleration power that the cylinder pressure will practically balance the static pressure that corresponds to the load contained in the bucket. The piston a l in this case will evidently be moved against the action of the spring 46 through a distance proportional to said pressure. The arm 43 is then rotated in the direction of the arrow 5 through a distance determined by the above said movement of the piston As soon as the channel 39 in this movement is brought out of communication with the inlet 35 and the passage, the compressed air in front of the piston is tightly enclosed so as to maintain the piston 44; in the position into which it has been set. Accordin as the piston a l has been moved outwardly to a more or less extent the slide 33 may be rotated th ough a larger or smaller angular distance in the direction Z) before the projection 52 strikes the inclined shoulder 5 1 thereby stopping the rotation. This rotation of the slide 33 results in a corresponding opening of the passage 10 to permit compressed air to pass from inlet 35, through channel 40, passage 37 and into the cylinder 12 above the piston 13. The admission of compressed air to the cylinder 12 has been predetermined automatically in the described way to correspond to the load on the bucket whereby a too rapid swinging movement of the bucket at small loads are prevented. The air thus admitted to the cylinder 12 causes the piston 18 to descend. The rod 17 of the descending piston 13 rotates the crank shaft 14: with the bucket arms 20 until they are stopped by the belt 57 striking the projection 73 on the top 51 of the motor. The material contained in the bucket will be thrown due to its inertia over the cylinder 12 and will fall down into the car.

At the beginning of the downward movement of the piston 13 the air contained in the crank casing is compressed. By way of the passage 60 compressed air will now pass into the sleeve 59 to press down the spring controlled stop pin 61 into any of the apertures 63 provided such an aperture coincides with the pin 61 or in case the bucket arms swing in lateral direction, so that the said pin will. be moved into position to coin cide with such an aperture. 'This will prevent any appreciable transverse vibration of the bucket arms and of the motor during the upward swinging movement of the buck et. The piston when plunging into the hon ing of the journal 11 will both effect lubrication. as already stated, andbe subjected to a braking action, as soon as it reaches the level of the lip 19. The adjustment ofthe admission of compressed air to the cylinder after the movement of the piston is started is effected by means of the cam 28. As soon as the upward movement of the arms 20 begins, the cam surface 29 comes to act upon the projection 3a of the arm 34 and turns said arm to cause the slide valve to successively reduce the admission of compressed air to the cylinder. After the projection 34 has reached the top of the cam surface 29 and until the cam surface 31 comes into contact with said projection 34 the admission of compressed air will remain constant though reduced to a small amount due to the partial. closing of the slide valve by means of the cam surface 29. The cam surface 31 will cause the slide valve 33 to completely shut off the admission of compressed air to the cylinder. vVhen the projection 34' reaches the top of the cam surface 31 the arm 34 is again in its normal position shown in Fig. 1, and the handle i3 is consequently also in its normal position shown in said figure.

The ascent of the piston takes place under the combined action of the compression of the air contained in the crank casing and of theweight of the bucket and its supporting arms, which when in raised position tends to fall back therefrom. During t.e ascent of the piston the arm 84 and the slide valve 33 will remain by friction in the normal posi tion to which they have been moved by the cam 28, as the cam 28 has no effect on the arm 34: during the ascent of the piston due to the fact that the projection 34' is now out of the path of said cam.

In the machine described above for the adjustment of the admission of driving fluid to the motor there is used a slide valve controlled by a hand lever mounted at the supporting arms of the bucket and a gearing connecting said hand lever and said slide valve. As described, said slide valve is com bined with means for varying the supply of driving fluid to the motor in accordance with the load on the bucket in such a way that in starting the motor by means of said hand lever, the bucket is first lifted until a condition of balance is obtained, a subsequent movement of the hand lever resulting in the bucket being swung upward completely, and in said last mentioned swinging movement the admission of driving fluid to the motor is adjusted to correspond to the load. However, experiments have shown, that the upward swinging movement of the bucket in two stages is suitable even in case no adjustment ofthe admission of driving fluid to the motor corresponding to the weight of the load is eli'ected, ina nuch as the bucket after having performed the first lifting may be moved laterally more freely and more easily than will be the case when the bucket is completely lowered.

In the machine shown in Figs. 7 18, in elusive, a lifting movement of the bucket in two stages is possible whether or not an adjustment of the admission of driving fluid to correspond to the load takes place. To this end the connection between the above said slide and the hand lever of this second machine comprises a link system which will open the slide upon the swinging movement of the hand lever to a determined stop position and will close same due to the resulting lifting movement of the bucket.

The supporting arms 20 of the bucket are mounted on the crank shaft 14 of the motor as in the embodiment already described. One arm carries the control lever of the slide controlling the admission of driving fluid to the motor and the casing of which is shown at 32 in Fig. 7. Attached to a square head at the end of the slide valve proper is a crank arm 71 connected by a link 72 to a similar crank arm 73 on the shaft 14. A connecting rod 74 connects the crank arm 73 to a crank arm 7 5 on the shaft 7 (3 of the hand lever 43. The shaft 76 is rotatably and slidably mounted in a sleeve or bushing 77 threaded into a lateral projection 78 of the supporting arm 20. The outer end of the bushing 77 is cut away at 7 9, Fig. 9, through an angular distance of about 210. The end of the hub of the hand lever 43 facing the bushing 77 is similarly cut away so .as to form a shoulder 80, Fig. 10. Said shoulder, however, has an angular length of about 180 only. The shoulder 80 fits into the cut away portion 79 and may evidently be moved 30 in the peripheral direction while maintaining the engagement with said cut away portion. A spring 81 is inserted between the inner end of the bushing 77 and a collar on the shaft 76 to press the hub of the arm 43 against the bushing 77.

Carried by the opposite end of the shaft 7 6 is the hand lever shown in Fig. 13. Said lever comprises an arm 82 slidably mounted on the shaft and provided with a locking pin 83 normally engaging a longitudinal groove 84 formed in the shaft 76. Formed in the shaft 76 at the outer end of the groove 84 is a boring 85 to receive the inner end of the pin 83 when the latter is moved inwards by a pressure exerted on its head 86.

The slide 33, Fig. 12, is formed as in the embodiment already described, with a through extending passage 40 and a branch passage 41 to control the comnninication between the inlet 35, the outlet 36 and the passage 37 leading to the motor cylinder. Attached to the slide is the arm 34 engaging the cam 28 on the shaft 14. Said arm is formed with a lateral projection 90 to be operated by a roller 87 on the piston rod 17.

The mechanisms described operate as follows: In starting the motor the hand lever 43 is removed from the normal position shown in Fig. 7 and rotated in the direction of the arrow a through the distance permitted by the cut away portion 79, that is about 30. By the intermedium of the link system 7176 the slide is simultaneously moved in the direction of the arrow I), Fig. 7. The final position of the slide is shown in Fig. 12 in which position the passage 40 connects the passage 37 to the inlet 35. The motor is thus started and lifts the bucket. In this movement the arms 43 and thus also the crank arm are maintained in a fixed position relatively to the supporting arms 20. The connection between the crank arm 7 5 and the connecting rod 74 will during the upward movement of the arms 20 move along an are 88 the centre of which coincides with that of the shaft 14. The connecting rod 74 will thus cause a rotation of the crank arm 73 and a corresponding rotation of the crank arm 71 with the slide in the direction of the arrow 0 so that after a predetermined upward movement of the arms the slide valve 33 will cut off the connection between the passages 35 and 37 and thus stop the motor. which the arms 20 with the bucket has now been lifted, is indicated by the dotted line 89, Fig. 7, showing the position of the arm 74, when the slide valve is closed. With the bucket in its lifted position, the necessary laterally swinging movements may be effected without any difficulty- In case the bucket is to swing up completely, the hand lever 43 is moved axially outwardly while taking the shaft 76 with it until the shoulder is brought out of engagement withthe cut away portion 79 so as to permit the hand lever to continue its rotation in the direction of the arrow a, until the passage 40 again restores the communication of the inlet 35 with the passage 37 so as to again start the motor which will then operate in the manner set forth in connection with the first em bodiment, with the difference that means is provided to throttle the outlet to a certain degree at the moment of reversal of stroke of the piston in order to obtain a smooth reversal of stroke. Said means comprises the roller 87. At the reversal of stroke of the piston at its lower dead centre the roller 87 is situated below the projection 90 of the arm 34 and when the piston is lifted owing to the compression in the crank casing, the arm 34 is rotated a sufficient angular distance in the direction of the arrow 7) to throttle the outlet and cause the lowering of thebucket to take place at a moderate speed. The position of the slide valve at this moment will be maintained until after the hand lever 43 is again rotated to effect any operation.

The hand lever 82 is provided for the purpose of enabling a desired starting from the right hand side of the bucket while preventing a non-desired starting from said side. Assuming the hand lever 82 strikes a rock wall or another obstacle in the swinging movement of the bucket this will have no other effect than to displace the lever 82 inwards on the shaft 76, the shaft, however, being prevented from axial movement and no disengagement of the arm 43 from the cut away portion 79 will thus take place. As-

The position to g suming the hand lever 82 be rotated simultaneously, an initial lifting movement only of the bucket will take place. Only after depression of the head 86' while maintaining the hand lever 82 in its outermost position a longitudinal displacement of the shaft 76 by means of the l6V61i82 may take place to release the lever 45 and permit the rotation of the shaft by means of the lever 82 necessary for completing the upward swinging movement of the bucket.

The driving fluid admission device above described may be advantageously combined with the means for speed regulation described in connection with the embodiment shown in Figs. 1--6. In this case, the passage 4L5 shown in said. embodiment is caused to coincide with an aperture formed in the slide valve casing so as to communicate with the cylinder chamber in the position of the slidecorresponding to the first lifting stage of the bucket. This will result in obtaining an air pressure in the cylinder, proportional to the weight of the load on the bucket.

YVhat I claim is 1. A machine for loading ores and the like into cars on mine tracks, comprising in combination a carriage frame, wheels for supporting said frame, another frame, pivotally mounted on said carriage frame to sweep horizontally thereover, an upstanding power motor, pivotally mounted at the free end of said other frame to rotate around a vertical axis in relation thereto, a horizontal crank shaft of said motor, arms attached to said shaft, and a bucket carried by said arms.

2. In a machine for loading ores and the like into cars on mine tracks, the combination with a carriage frame, of a vertical journal mounted in said carriage frame, another frame carried by said ournal to sweep over the said carriage frame, another journal mounted at the free end of said other frame, an upstanding power motor carried by said other journal, a bucket operated by said power motor, a stationary pulley surrounding concentrically said first-mentioned jour-- nal, and a transmission connecting said stationary pulley and the motor supporting journal to positively cause a lateral rotation of the motor supporting frame upon rotation of the motor about its journal.

3. In a loading machine for ores and the like, the combination with a carriage frame, wheels for supporting said frame, another frame, rotatably mounted on said carriage frame to sweep laterally thereover, a vertical journal mounted at the free end of said other frame, an upstanding power motor cylinder formed integral with said journal in aXial alinement therewith, a piston in said cylinder, and a bucket operatively connected to said piston.

4.. In a machine for loading ores on mine tracks, the combination with an upstanding cylinder, of a piston mounted to slide there in, a piston rod, a crank casing in open comnunication with the interior of said cylinder below the piston, a crank shaft, arms on said crank shaft, a bucket carried by said arms, and an oil chamber in open communication with said crank casing and so situated as to be engaged by a part of the piston upon each downward stroke thereof.

5. In a machine for loading ores into cars, the combination with an upstanding cylinder, of a piston therein, a piston rod, a closed crank casing in open communication with the interior of the cylinder below, the piston, a crank shaft, arms on said crank shaft, a bucket carried by said arms, an oil chamber at the lower end of said cylinder, said oil chamber beingshaped to form a guide for the said piston rod at and near its lower dead center.

6. In a machine for loading ores and the like into cars on mine tracks, the combination with an upstanding cylinder, of a piston therein, means for introducing motive power on the upper side of said piston, a piston rod, a crank shaft, arms attached to said crank shaft, a bucket carried by said arms, and a connection between said piston rod and said crank shaft to cause the said bucket arms to swing upwardly upon the downward movement of the piston.

7. In a machine for loading ores and the like in cars on mine tracks, the combination with an upstanding cylinder, of a piston therein, a piston rod, means for introducing motive power to the upper side of said piston, a closed crank casing in open communication with the interior of the cylinder'below the piston therein, an oil chamber at the lower end of said cylinder, said oil chamber being shaped to form a liquid brake for the piston rod during the last part of its downward movement.

8. In a machine for loading ores and the like in cars on mine tracks, tie combination with an upstanding cylinder, of a piston therein, piston rod forming one element of a transmission gearing, a crank shaft, another transmission gearing element on said crank shaft to mesh. with said first-mentio ed element, arms on said crank shaft, and a bucket carried by said arms.

9. In a machine for loading ores and the like into cars on mine tracks, the combination with anupstanding cylinder, of a piston therein, means to introduce motive power to the upper side of said piston, a piston rod shaped to form a toothed rack, a crank shaft, a toothed segment on said crank shaft to mesh with said toothed rack, and an oil chamber at the lowermost part of said cylinder, said chamber at its lowermost portion being formed with an inner sectional area corresponding with a small play to the sectional area of the piston rod at the lowermost part thereof.

10. In a machine for loading ores and the like into cars on mine tracks, the combination with a carriage frame, of another frame pivotally mounted on said carriage frame to sweep horizontally thereover, a hollow vertical journal mounted at the free end of said other frame, and an upstanding cylinder formed integral with said hollow journal and the interior of which is in open communication with the interior of said hollow journal.

11. In a machine for loading ores and the like into cars on mine tracks, the combination with a carriage frame, of another frame pivotally mounted on said carriage frame to swee horizontally thereover, an

upstanding power motor rotatably mounted at the free end of said frame to move around a vertical axis relatively thereto, a bucket carried by said motor, means to momentarily arrest the movable system, comprising said movable frame and said motor, after each movement thereof, said means comprising a pneumatically operated pin or the like slidably mounted in a part of the motor and arranged to be brought into engagement with any of a series of apertures formed in the motor supporting frame, and means for releasing said arresting means.

12. In a machine for loading ores and the like into cars on mine tracks, the combination with an upstanding cylinder, of a piston therein, means for admitting a'driving fluid to the upper side of said piston, a slide valve to adjust said admission of driving fluid to the motor, said slide valve being formed with two systems of channels of which one is formed with a constant area and the other with an adjustable area, and

pivotally mounted at the said, arms, and a connection between said hand lever and said slide valve.

14. In a machine for loading ores and the like into cars on mine tracks, the combina tion with a carriage frame,of another frame pivotally mounted thereto to sweep horizontally thereover, an upstanding cylinder, mounted at the free end of said other frame to rotate about a vertical axis in relation thereto, a piston in said cylinder, a piston rod, a horizontal crank shaft, a connection between said piston and said crank shaft, arms on said crank shaft, a bucket on said arms, means to admit motive power to the upper side of said piston, means for adjusting the said admission of motive power so as to cause a. lifting of the bucket in two stages, and means for stopping the lifting movement of the bucket when in a nearly vertical position.

In testimony whereof I have signed my name.

THORE ROBERT EUGEN RUNDQVIST.

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