US2603373A - Mine timber setting machine - Google Patents

Mine timber setting machine Download PDF

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US2603373A
US2603373A US2603373DA US2603373A US 2603373 A US2603373 A US 2603373A US 2603373D A US2603373D A US 2603373DA US 2603373 A US2603373 A US 2603373A
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jacking mechanism
sleeve
frame
mine
vehicle
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/02—Lining predominantly with wood
    • E21D11/03—Lining predominantly with wood using timber- setting machines

Definitions

  • This invention relates to mine machinery, and more particularly to a timber setting machine.
  • An object of this invention is to provide a machine for raising timbers which are to bear plied to the roof of a mine and thereafter fixed in place for supporting the roof.
  • Another object of the invention resides in the provision of a machine for raising and holding timbers in place until they are securely supported by props, the machine having a jacking mec anism which is pivotallycennected to the frame of a vehicle, which jacking mechanism is capable of being pivoted to hold the timber in any desired location.
  • Figure 2 is atop plan view of thetl'ev'i'ce as -slic w'n in Figure 1;
  • Figure 3 is abottom plan'view'of the timber setting machine;
  • I I I Figure 4 is a rear elevatioh'al view of the invention; l s v.
  • FIG. 5 is a'v'ertical sectional view astaken along the line 55 in Figure-1, the figure illustrating the jackingmechanism in particular and being enlarged; to showl the various element thereof in greater detail;
  • 1 V Figure 6 is-a vertical sectional viewJ-as'taken along the line 6-6 in Figureb;
  • FIG 7 is an enlarged horizontal sectional 2 view as taken along the line l- 'l in Figure 5 and Figure 8 is'a schematic diagram of the hydraulic conduit system used in actuating the present invention.
  • I v I
  • reference numeral generally designates the machine comprising the present invention which is adapted to raise and hold timbers in place until theyare securely supported byi rop's so as to support the roof of a mine.
  • the machine [0 comprises a vehicle having-a yoke-like frame l2 having a pair of longitudinally extending parallel support members l'4 and'lt positioned thereon.
  • the front wheel I8 is journaled in brackets 20 which extend downwardly from the longitudinal frame members [4 audit.
  • a conical shield 22 is provided for shielding the wheel so as "to'prevent injury to the operator of the device or damage to the machinery. The machine It is.
  • 'wh'eeljsjsu and 32 ar driven by the drive shaft 28 which, in turn, is driven by the difierential assembly including a ring gear and pinion generally I designated by the reference numeral '34.
  • the pinion gear ofthisdifferential assembly is driven by the hydraulic motor which 'is 'reverslble and which is controlled by valve 38 'mounted (which may beset at the desired vpressure.
  • 'The electricmot or;4ll is supplied with currentthroug h cable 44 whichis attached by a plug Mite a's'uitable source of, current,
  • a switch box 4 ⁇ is Y mounted on the forward .portionof the frame for controlling the. flow ofcurrent through the inotor 4B. Suitable conduits areprovidedifor connecting the pump 41 with a fluid supplyreservoir Sil suspended from the frame.
  • the sleeve 52 Betweenthemerribers 14v and Fe and centrally located on thevehicle there; is pivotaliy moiinte'd the sleeve member 52.
  • the sleeve 52 has a'sduare 3 aperture 54 and within this aperture a tubular casing bracket 56 is pinned by means of pins 58.
  • the cylinder 60 of the hydraulic jacking mechanism Secured to the bracket 56 is the cylinder 60 of the hydraulic jacking mechanism which includes extensible pistons 62, 64 and 66 concentrically disposed in the cylinder 60.
  • the pistons 62 and 64 are provided with bottom plates 68 and I which have apertures I2 and I4 therein, respectively, permitting the passage of hydraulic fluid under pressure.
  • the bottom plate I6 of the piston 66 is provided with a recess I8 therein and an aperture through which a bolt 80 is inserted and secured by a nut 82 in the recess 18.
  • the bolt 82 is provided with an eye 84 at its upper end for retention of one end of a coil spring 86, the other end of which is connected through an eye 88 formed in a piston-like mounting 90 to which there is pivotally attached a supporting platform 92.
  • the spring 86 continuously urges the platform 82 into engagement with the shelf 84 and hence into a position substantially perpendicular to the jacking mechanism within the cylinder 60.
  • the platform 92 may still engage a vertical roof, thus permitting a timber to be held in proper position.
  • the" sleeve member 52 is provided with a pin 96 which is engageable within a plate 98 held between the flanged edges of channel member I4. Further, the sleeve member 52 has a tubular portion I00 extending therefrom opposed to the pins 96 which extends through the member I6, plate I02 and through a bracket I04 welded or otherwise secured to the part of the member I0 0, the member IIO being secured to the member -I00'by means of set screw I I2.
  • crank I I4 Extending through a slot formed in the member I I0 is positioned a crank I I4 which is pinned to a bearing II6 journaled in housing H8.
  • the housingl I8 is rigidly secured by suitable brackets I20 to the member 'I I0.-'
  • the otherend of" the crank II 4 is threadedly engaged within a tubular member I22 which is pivotally connected as at I24 to an extension I26 of the bottom plate I28 a bearing I34-journaled within the casing I30
  • the threaded end of the crank I32 is threadingly engaged within a threaded block I36 secured to the frame I2:
  • the jacking mechanism may be rocked or tilted from the front to the rear.
  • the hydraulic fluid from the pump 42 is supplied to the jacking mechanism cylinder 60 through a suitable inlet conduit and a valve I38 is provided for actuating or deactivating the jacking mechanism.
  • the timber setting machine can be used for numerous other purposes, due to the way the platform 92 is cap-screwed to the shelf or shoulder 94 so it can be disengaged and other type platforms 92 can be cap-screwed to 94 for auger drills, jack hammer drills, pushing in roof bolts or holding square timber, or even I-beams and .channel iron in the construction of various kinds of buildings.
  • a machine for setting timber overhead in a mine comprising a vehicle having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking thejacking mechanism in a direction transverse of the longitudinal axis of said vehicle, means engaging said sleeve for rocking the jackin mechanism in a direction parallel to the longitudinal axis of said ,,vehicle, and means for selectively disengaging'said sleeve fromsaid second recited means to permit said jacking mechanism to be rotated to asubstantially horizontal position, a pair of drive wheels secured to said frame, and hydraulic means on said vehicle, said .Fhydraulic meansia'ctuating said jacking mechanism and said drive wheels.
  • a machine for-settingtimber overhead in a mine comprising'a vehicle'having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanismin a direction transverse of the longitudinalaxis of said vehicle, means engaging said sleeve for rocking the jacking mechanism in a direction parallel to. the longitudinal axis of said vehicle,l a platform pivotally secured at the top of said jack mechanism, and means secured to said platform continuously urging said platform into a position at right angles to said jacking mechanism.
  • a machine for, setting timber overhead in a mine comprising avehicle having a frame; a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanism in a direction transverse of the lon itudinal axis of said vehiclejmeans engaging said sleeve for rocking the jacking mechanism in a direction parallel-to the-longitudinal axis of said vehicle, a platform pivotally secured at the top of said jacking mechanism, and means secured to said platform continuously urging said. platform into a position at right. angles to said jacking mechanism, and
  • a machine for setting timber overhead in a mine comprising a vehicle having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanism in a direction transverse of the longitudinal axis of said vehicle, means engaging said sleeve for rocking the jacking mechanism in a direction parallel to the longitudinal axis of said vehicle, a platform pivotally secured at the top of said jacking mechanism, and means secured to said platform continuously urging said platform into a position at right angles to said jacking mechanism, and means for selectively disengaging said sleeve from said second recited means to permit said jacking mechanism to be rotated to a substantially horizontal position, a pair of drive wheels secured to said frame, and hydraulic means on said vehicle, said hydraulic means actuating said jacking mechanism and said drive wheels.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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Description

J. R. M FARLAND ETAL 2,603,373
MINE TIMBER SETTING MACHINE July 15, 1952 4 sheets-sheet 1 Jesse R. McFarland Glenn A. Long INVENTORS Filed March 24, 1950 y 1952 J. R. MCFARLAND ET AL 2,603,373
MINE TIMBER SETTING MACHINE Filed March 24, 1950 4 SheetsSheei. 2
K I Jesse R. McFarland Glenn A. Long INVENTORS y 1952 J. R. MCFARLAND EI'AL 2,603,373
MINE TIMBER SETTING MACHINE Filed March 24, 1950 4 Sheets-Sheet 3 v Jess R. McFarland-f .Glenn A. Long v INlf'ENTORS BY mum.
MM.EM5W I July 15, 1952 J. R. MCFARLAND ETAL MINE TIMBER SETTING MACHINE Filed March 24, 1950 4 Sheets-Sheet 4 Patented July 15, 1952 IVIINE TIIHBER SETTING MACHINE. V i
Jesse B. McFarland and Glenn A. Long,
Sunnyside, Utah Application March 24, 1950, Serial No.- 151,568 7 elatin-s. (01.214 95) This invention relates to mine machinery, and more particularly to a timber setting machine. An object of this invention is to provide a machine for raising timbers which are to bear plied to the roof of a mine and thereafter fixed in place for supporting the roof. I I Another object of the invention resides in the provision of a machine for raising and holding timbers in place until they are securely supported by props, the machine having a jacking mec anism which is pivotallycennected to the frame of a vehicle, which jacking mechanism is capable of being pivoted to hold the timber in any desired location.
Yet another objectof th i s mention is achieves by the provision of a platform pivetany attached to a jacking mechanism, which platform is continuous'ly urged by spring means tc maintain a predetermined position relative to the jacking member. s I I Yet another object oftheinvention is to provide means for selectively releasing the jacking mechanism so that such may be rotated to 'a position substantially parallel to the frame of the vehicle on which the jacking mechanism is pivotally secured. I I I I Still further objects of the invention reside in theprovision of a machine for setting timber in a mine that is strong, durable, highly efficient in operation, simple in construction and design,
capable of being used for various divergent purposes, and which employs an electrically operated prime mover, for actuating. hydraulic means for raising and lowering the jacking mechanism and also for propelling the vehicle.
These, together with the var1ous ancillary objects of the invention are attained by-the timber setting machine, a preferred embodiment of which has been illustrated-in the accompanying drawings, by way of example "only, wherein; I
' Figure 1 is a side 'elevational viewof the invention; I I
"Figure 2 is atop plan view of thetl'ev'i'ce as -slic w'n in Figure 1;
Figure 3 is abottom plan'view'of the timber setting machine; I I I Figure 4 is a rear elevatioh'al view of the invention; l s v.
a Figure 5 is a'v'ertical sectional view astaken along the line 55 in Figure-1, the figure illustrating the jackingmechanism in particular and being enlarged; to showl the various element thereof in greater detail; 1 V Figure 6 is-a vertical sectional viewJ-as'taken along the line 6-6 in Figureb; A
Figure 7 is an enlarged horizontal sectional 2 view as taken along the line l- 'l in Figure 5 and Figure 8 is'a schematic diagram of the hydraulic conduit system used in actuating the present invention. I v I With continuing reference to the accompanying drawings wherein like reference numerals designate similar parts throughout the various views, reference numeral generally designates the machine comprising the present invention which is adapted to raise and hold timbers in place until theyare securely supported byi rop's so as to support the roof of a mine. The machine [0 comprises a vehicle having-a yoke-like frame l2 having a pair of longitudinally extending parallel support members l'4 and'lt positioned thereon. II I The front wheel I8 is journaled in brackets 20 which extend downwardly from the longitudinal frame members [4 audit. A conical shield 22 is provided for shielding the wheel so as "to'prevent injury to the operator of the device or damage to the machinery. The machine It is.
steered by means of the tillerrod 74 which is operatively connected to the front wheel l8.
A brake lever 261s operatively emplaced between the members and I6, andthe brake rods attaching the brake lever 26 to the brake shoes extend along inside the fra'fne l2. Journaled in the frame I2, is'a drive'shaft 2B towhich the rear wheels 30 and 32 ares'e'cured. The
'wh'eeljsjsu and 32 ar driven by the drive shaft 28 which, in turn, is driven by the difierential assembly including a ring gear and pinion generally I designated by the reference numeral '34. The pinion gear ofthisdifferential assembly is driven by the hydraulic motor which 'is 'reverslble and which is controlled by valve 38 'mounted (which may beset at the desired vpressure. 'The electricmot or;4ll is supplied with currentthroug h cable 44 whichis attached by a plug Mite a's'uitable source of, current, A switch box 4} is Y mounted on the forward .portionof the frame for controlling the. flow ofcurrent through the inotor 4B. Suitable conduits areprovidedifor connecting the pump 41 with a fluid supplyreservoir Sil suspended from the frame.
Betweenthemerribers 14v and Fe and centrally located on thevehicle there; is pivotaliy moiinte'd the sleeve member 52. The sleeve 52has a'sduare 3 aperture 54 and within this aperture a tubular casing bracket 56 is pinned by means of pins 58. Secured to the bracket 56 is the cylinder 60 of the hydraulic jacking mechanism which includes extensible pistons 62, 64 and 66 concentrically disposed in the cylinder 60. The pistons 62 and 64 are provided with bottom plates 68 and I which have apertures I2 and I4 therein, respectively, permitting the passage of hydraulic fluid under pressure. The bottom plate I6 of the piston 66 is provided with a recess I8 therein and an aperture through which a bolt 80 is inserted and secured by a nut 82 in the recess 18. The bolt 82 is provided with an eye 84 at its upper end for retention of one end of a coil spring 86, the other end of which is connected through an eye 88 formed in a piston-like mounting 90 to which there is pivotally attached a supporting platform 92. As the upper end of the piston 66 is provided with a shelf or shoulder 94, the spring 86 continuously urges the platform 82 into engagement with the shelf 84 and hence into a position substantially perpendicular to the jacking mechanism within the cylinder 60. Thus, when'the jacking mechanism is tilted from a position substantially vertical, the platform 92 may still engage a vertical roof, thus permitting a timber to be held in proper position.
As can be readily seen, the" sleeve member 52 is provided with a pin 96 which is engageable within a plate 98 held between the flanged edges of channel member I4. Further, the sleeve member 52 has a tubular portion I00 extending therefrom opposed to the pins 96 which extends through the member I6, plate I02 and through a bracket I04 welded or otherwise secured to the part of the member I0 0, the member IIO being secured to the member -I00'by means of set screw I I2. Thus it can be seen that the spring-pressed pin I08 selectively retains the members I06 and I I0 in engagement, When the spring I08 is withdrawn, this permits the jack mechanism to be rotated rearwardly to the position as is shown in dotted linesin Figure l. s
Extending through a slot formed in the member I I0 is positioned a crank I I4 which is pinned to a bearing II6 journaled in housing H8. The housingl I8 is rigidly secured by suitable brackets I20 to the member 'I I0.-' The otherend of" the crank II 4 is threadedly engaged within a tubular member I22 which is pivotally connected as at I24 to an extension I26 of the bottom plate I28 a bearing I34-journaled within the casing I30 The threaded end of the crank I32 is threadingly engaged within a threaded block I36 secured to the frame I2: Thus, with the pin I08 in its engaging position, upon rotation of the crank I32, the jacking mechanism may be rocked or tilted from the front to the rear.
As can be readily understood, the hydraulic fluid from the pump 42 is supplied to the jacking mechanism cylinder 60 through a suitable inlet conduit and a valve I38 is provided for actuating or deactivating the jacking mechanism.
The timber setting machine can be used for numerous other purposes, due to the way the platform 92 is cap-screwed to the shelf or shoulder 94 so it can be disengaged and other type platforms 92 can be cap-screwed to 94 for auger drills, jack hammer drills, pushing in roof bolts or holding square timber, or even I-beams and .channel iron in the construction of various kinds of buildings.
Since from the foregoing the construction and advantages of this mine timber setting machine is readily apparent, further description is believed to be unnecessary.
. .However, since numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may be readily resorted to which will fall within the scope of the appended claims.
Having described the invention, what is claimed as new is:
l. A machine for setting timber overhead in a mine comprising a vehicle having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking thejacking mechanism in a direction transverse of the longitudinal axis of said vehicle, means engaging said sleeve for rocking the jackin mechanism in a direction parallel to the longitudinal axis of said ,,vehicle, and means for selectively disengaging'said sleeve fromsaid second recited means to permit said jacking mechanism to be rotated to asubstantially horizontal position, a pair of drive wheels secured to said frame, and hydraulic means on said vehicle, said .Fhydraulic meansia'ctuating said jacking mechanism and said drive wheels. 1 I
2. A machine for-settingtimber overhead in a mine comprising'a vehicle'having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanismin a direction transverse of the longitudinalaxis of said vehicle, means engaging said sleeve for rocking the jacking mechanism in a direction parallel to. the longitudinal axis of said vehicle,l a platform pivotally secured at the top of said jack mechanism, and means secured to said platform continuously urging said platform into a position at right angles to said jacking mechanism.
3. A machine for, setting timber overhead in a mine comprising avehicle having a frame; a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanism in a direction transverse of the lon itudinal axis of said vehiclejmeans engaging said sleeve for rocking the jacking mechanism in a direction parallel-to the-longitudinal axis of said vehicle, a platform pivotally secured at the top of said jacking mechanism, and means secured to said platform continuously urging said. platform into a position at right. angles to said jacking mechanism, and
means for selectively disengaging said sleeve from said second recited mea'nsto: permit saidjacking mechanism tobe rotated lto-a.'substantially horizontal position. r.
4. A machine for setting timber overhead in a mine comprising a vehicle having a frame, a sleeve pivotally secured to said frame, a jacking mechanism pivotally secured to said sleeve, means attached to said jacking mechanism for rocking the jacking mechanism in a direction transverse of the longitudinal axis of said vehicle, means engaging said sleeve for rocking the jacking mechanism in a direction parallel to the longitudinal axis of said vehicle, a platform pivotally secured at the top of said jacking mechanism, and means secured to said platform continuously urging said platform into a position at right angles to said jacking mechanism, and means for selectively disengaging said sleeve from said second recited means to permit said jacking mechanism to be rotated to a substantially horizontal position, a pair of drive wheels secured to said frame, and hydraulic means on said vehicle, said hydraulic means actuating said jacking mechanism and said drive wheels.
JESSE R. McFARLAND. GLENN A. LONG.
REFERENCES CITED The following references are of record in the file of this patent:
5 UNITED STATES PATENTS Number Name Date 1,270,231 Stauft June 18, 1918 1,907,024 Willard May 2, 1933 10 2,174,415 Curtis Sept. 26, 1939 2,320,600 Howell June 1, 1943 2,408,387 Gay et a1 Got. 1, 1946 2,433,900 Grime Jan. 6, 1948 2,456,878 Krupka et a1 Dec. 21, 1948 15 2,458,590 Harris et a1 Jan. 11, 1949 2,536,614 Syracusa Jan. 2, 1951 2,574,857 Ball Nov. 13, 1951 FOREIGN PATENTS 20 Number Country Date 537,018 France Feb. 23, 1922 664,920 Germany Sept. 13, 1938
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700483A (en) * 1953-02-26 1955-01-25 Ruger Equipment Inc Mine timber setting lift
US2705083A (en) * 1952-01-14 1955-03-29 Boeing Co Self-loading cargo elevating truck
US2903039A (en) * 1956-05-14 1959-09-08 Rohr Aircraft Corp Pivoted stretch bending machine with two concentric selectively operable cylinder motors for tensioning workpiece
US2908142A (en) * 1956-09-28 1959-10-13 De Long Corp Supporting leg assembly for marine platform
US2961837A (en) * 1956-09-28 1960-11-29 Delong Corp Supporting leg assembly for marine platform
US3136534A (en) * 1961-10-02 1964-06-09 William S Howard Mine tram

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1270231A (en) * 1916-11-09 1918-06-18 Daniel B Stauft Gang-drill for cutting coal.
FR537018A (en) * 1921-06-18 1922-05-13 Cylinder
US1907024A (en) * 1929-12-13 1933-05-02 Willard Portable hoist
DE664920C (en) * 1936-12-01 1938-09-13 Hans Bilstein Trolley for towing vehicles
US2174415A (en) * 1938-02-28 1939-09-26 Sullivan Machinery Co Rock drilling rig
US2320600A (en) * 1942-09-05 1943-06-01 Roy C Howell Industrial truck
US2408387A (en) * 1945-02-01 1946-10-01 Harry Samuel Gay Timber setting machine
US2433900A (en) * 1943-05-01 1948-01-06 Edward P Grime Lifting apparatus
US2456878A (en) * 1945-01-31 1948-12-21 Helen G Krupka Timberman's jack
US2458590A (en) * 1946-04-19 1949-01-11 George W Harris Combination automobile jack and engine starting device
US2536614A (en) * 1945-10-12 1951-01-02 Syracusa Michael Propeller handling mechanism
US2574857A (en) * 1948-05-01 1951-11-13 Joy Mfg Co Yieldably mounted tiltable support for mine timbering machines

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1270231A (en) * 1916-11-09 1918-06-18 Daniel B Stauft Gang-drill for cutting coal.
FR537018A (en) * 1921-06-18 1922-05-13 Cylinder
US1907024A (en) * 1929-12-13 1933-05-02 Willard Portable hoist
DE664920C (en) * 1936-12-01 1938-09-13 Hans Bilstein Trolley for towing vehicles
US2174415A (en) * 1938-02-28 1939-09-26 Sullivan Machinery Co Rock drilling rig
US2320600A (en) * 1942-09-05 1943-06-01 Roy C Howell Industrial truck
US2433900A (en) * 1943-05-01 1948-01-06 Edward P Grime Lifting apparatus
US2456878A (en) * 1945-01-31 1948-12-21 Helen G Krupka Timberman's jack
US2408387A (en) * 1945-02-01 1946-10-01 Harry Samuel Gay Timber setting machine
US2536614A (en) * 1945-10-12 1951-01-02 Syracusa Michael Propeller handling mechanism
US2458590A (en) * 1946-04-19 1949-01-11 George W Harris Combination automobile jack and engine starting device
US2574857A (en) * 1948-05-01 1951-11-13 Joy Mfg Co Yieldably mounted tiltable support for mine timbering machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705083A (en) * 1952-01-14 1955-03-29 Boeing Co Self-loading cargo elevating truck
US2700483A (en) * 1953-02-26 1955-01-25 Ruger Equipment Inc Mine timber setting lift
US2903039A (en) * 1956-05-14 1959-09-08 Rohr Aircraft Corp Pivoted stretch bending machine with two concentric selectively operable cylinder motors for tensioning workpiece
US2908142A (en) * 1956-09-28 1959-10-13 De Long Corp Supporting leg assembly for marine platform
US2961837A (en) * 1956-09-28 1960-11-29 Delong Corp Supporting leg assembly for marine platform
US3136534A (en) * 1961-10-02 1964-06-09 William S Howard Mine tram

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