US3561890A - Windmill tower - Google Patents

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US3561890A
US3561890A US830675A US3561890DA US3561890A US 3561890 A US3561890 A US 3561890A US 830675 A US830675 A US 830675A US 3561890D A US3561890D A US 3561890DA US 3561890 A US3561890 A US 3561890A
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stem
platform
tower
windmill
axis
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Martin A Peterson
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Martin A Peterson
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D13/00Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • F03D13/22Foundations specially adapted for wind motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D9/00Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20Wind motors characterised by the driven apparatus
    • F03D9/28Wind motors characterised by the driven apparatus the apparatus being a pump or a compressor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2240/00Components
    • F05B2240/90Mounting on supporting structures or systems
    • F05B2240/91Mounting on supporting structures or systems on a stationary structure
    • F05B2240/913Mounting on supporting structures or systems on a stationary structure on a mast
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • Y02E10/728Onshore towers

Abstract

AN EXCEEDINGLY STABLE WINDMILL TOWER ADAPTED FOR EASE OF INSTALLATION AND OPERATION. THE STABLE WINDMILL TOWER IS ESPECIALLY ADAPTED FOR NORMALLY REQUIRED WELL SERVICING OPERATIONS INCLUDING, BUT NOT LIMITED TO, REMOVING THE WINDMILL FROM OVERLYING RELATIONSHIP TO THE CONCENTRIC WELL CASING, WELL PIPE, AND THE PUMPING ROD, BY ROTATING THE WINDMILL TOWER ABOUT ITS VERTICAL AXIS FROMK GROUND LEVEL BY THE OPERATOR.

Description

Feb. 9, 1971 M. A. PETERSON 3,561,890

WINDMILL TOWER Filed June 5, 1969 3 Sheets-Sheet 1 lOl 3 63 fi /[FRY f 51 o 60R 74 I 6; GI

MART/IV A. PETERSON ATTOR N EY BY k Feb. 9, 1971 M. A. PETERSON 3,561,890

WINDMILL TOWER Filed June 5, 1969 3 Sheets-Sheet 2 MART/N A. PETERSON INVENTOR.

By ATTORNEY Feb. 9, 1971 M. A. PETERSON WINDMILL TOWER 3 SheetsShee t 5 Filed June a, 1969 MART/N A. PETERSON mvamoa BY )ZwM my ATTORNEY 3,561,890 WINDMILL TOWER Martin A. Peterson, Newport, Nebr. (RED. 1, Rose, Nebr. 68772) Filed June 5, 1969, Ser. No. 830,675 Int. Cl. F04!) 17/00 U.S. Cl. 417-336 Claims ABSTRACT OF THE DISCLOSURE An exceedingly stable windmill tower adapted for ease of installation and operation. The stable windmill tower is especially adapted for normally required well servicing operations including, but not limited to, removing the windmill from overlying relationship to the concentric well casing, well pipe, and the pumping rod, by rotating the windmill tower about its vertical axis from ground level by the operator.

Windmill towers conventionally comprise an upright mast or standard, the upper portion of which is integrally provided with a substantially horizontal platform that supports the wind-driven windmill loftily above the well casing. A vertically elongate pumping-rod is actuatably connected to the windmill and extends downwardly therefrom into the well casing along the casing-axis to a subterranean pump, rotary motion of the windmill blades causing vertical reciprocation of the pumping-rod whereby subterranean water is pumped upwardly along the casing-axis to the earth surface. In the so-called tubular well situation, the well casing itself serves as the vertical conduit for the upwardly pumped fluid, while in the more prevalent concentric pipe situation, a segmented pipe concentrically surrounded by the casing serves as the vertical conduit means; in both situations the subterranean fluid is pumped upwardly along the casing-axis. Oftentimes, the subterranean pump mal-functions whereby the pumping-rod and connected pump need to be upwardly withdrawn from the earth to permit pumping-rod and pump repair. If the well be of the concentric pipe type, both the pumping-rod and the coupled pipe segments, i.e'. the pipe string, can be together withdrawn upwardly from the earth, to permit repair or replacement of the pump, or the pumping-rod, or of one or more faulty pipe segments. In such instances, especially where the well is deep and the pumping-rod or the pipe string is lengthier than the height of the windmill above the earth, the windmill and its platform must be temporarily removed from vertically overlying relationship with the well casing. In the prior art, such temporary removal is difficult and requires either total dismantling of the windmill tower at ground level, or the operator must subject himself to the danger of climbing to the platform for the required task.

It is accordingly the general object of the present invention to provide a means for the removal of the windmill and its supporting platform from vertical alignment with the well casing whereby said removal can be safely, readily, and conveniently accomplished from ground level, even by a lone unassisted operator.

Other objects of the present invention are to provide a windmill tower that is of simple and economical construction, that is exceedingly simple to erect during original installation thereof, that is unusually stable and reliable during operation, and that is readily and safely main tainable in good operating condition even when it be required to temporarily remove the pumping-rod, the segmented pipe string, or the subterranean pump from the earth.

With the above and other objects and advantages in view which will become more apparent as this descrip- United States Patent Ofllce 3,561,890 Patented Feb. 9, 1971 tion proceeds, the windmill tower of the present invention generally comprises: an upright base member attached to the earth and disposed along a vertical tower-axis that is rearwardly laterally offset with respect to the well casing-axis; an upright lofty stem disposed along the toweraxis; and adapted to rotate at least about the toweraxis with respect to the base member; a novel platform member rigidly attached to the lofty stem near the upper end thereof, said novel platform providing a support for a windmill disposed loftily above the well casing at the casing-axis; and a plurality of novel oblique braces removably connected between the platform member and the earth.

In the drawing wherein like characters refer to like parts in the several views, and in which:

FIG. 1 is a side elevational view, partly broken away at the earth along section line 1-1 of FIG. 3, showing a preferred embodiment of the windmill tower of the present invention.

FIG. 2 is a sectional plan view taken along line 2-2 of FIG. 1.

FIG. 3 is a top plan view taken along 3-3 of FIG. 1.

FIG. 4 is a sectional elevational view taken along lateral directional line 44 of FIG. 3.

FIG. 5 is a sectional elevational view taken along transverse directional line 5-5 of FIG. 3.

The environment for the windmill tower of the present invention (said tower being indicated generally at A and having a lofty stem 20 disposed along and rotatable about tower-axis T) includes a well W comprising casing 90 extending into the earth E along vertical casing-axis C to a source of subterranean water (not shown). While the present invention is equally adapted for both the tubular well and concentric pipe types well environment, FIGS. 1 and 2 arbitrarily show the concentric pipe type Well including the pipe string uppermost segment 92, the next lower segment 91, and an inter-segments coupling 96. The uppermost pipe string segment 92 conventionally extends above the earth surface and maintained there by conventional well base cap 99, and is detachably secured to a stable upright member e.g. base member 10, as by menas of laterally extending bracket 93. A windmill having a plurality of downwardly extending sup port legs 101 attached upon platform member 60 has a propeller or the like 102 responsive to the wind and conventional means (not shown) to translate the rotary action of propeller 102 into reciprocatory action of the pumping-rod 105. Pumping-rod 105 is disposed along casing-axis C and extends downwardly into the segmented pipe string, and the pumping-rod lower end is actuatably connected to a pump (not shown) at the subterranean water source whereby Water can be withdrawn from the well through a lateral conduit or the like 94 at any desired location. The pipe string 91-92 and the pumpingrod 105 are formed in sections or segments and may be disconnected by unscrewing certain joints such as indicated generally at 106 on pumping-rod 105, and at 96 on the pipe string 91-92.

Windmill tower A comprises generally: a relatively short upright base member 10 disposed along tower-axis T and afiixed to the earth as by means of concrete footing 15, base member upper end 11 being disposed above the earth surface; an upright novel stem 20 extending loftily above base member upper end 11 and along toweraxis T, said stem 20 being revolvable for a least 90 about tower-axis T; a novel substantially horizontal platform member 60 rigidly attached to stem 20 at stem up er end 21 and extending laterally from tower-axis T across casing-axis C, said platform 60 including hereinafter described novel attachments and fittings; and a plurality of novel oblique braces e.g. 50, 45, 46, detachably connected between the platform means and the earth E.

Upright base member preferably comprises a vertical cylindrical tube concentric about tower-axis T. The base member lower portion is rigidly affixed to the earth with concrete footing whereby base member 10 is nonrotatable about tower-axis T, and in this regard, base member 10 near its lower end 12 has integrally attached outwardly extending lugs 13 to promote non-rotatable engagement of said base 10 into concrete footing 15. Base member upper end 11 is preferably disposed less than about four feet above the earths surface whereby the stem lower portion immediately above 11 is manipulatable by an operator of average physical height.

The upright stem herein comprises a vertical cylindrical tube concentric about tower-axis T, stem 20 having an upper end 21 and a lower end 22. Stem upper end 21 is disposed loftily above base member upper end 11 on the typical order of at least about ten feet whereby base member upper end 11 is disposed nearer to the earth surface than to stem upper end 21. The outside diameter of stem 20 is less than the inside diameter of base member 10, and the stem lower portion adjacent to stem lower end 22 is disposed within base member 10 below its upper end 11. Stem 20 nearer to lower end 22 than to upper end 21 integrally includes an outwardly extending annular protuberance 23 surrounding tower-axis T, said protuberance 23 resting upon the upper end 11 of rigid non-rotatable base member 10. Thus, stem 20, through protuberance 23 resting upon base member upper end 11, is maintained in elevation above the earth and is free to rotate about tower-axis T.

There are means, herein as set-screw 29 threadedly engaged with base member 10 and bearable against that portion of stem 20 disposed below base member upper end 11, to temporarily prevent rotation of stem 20 about tower-axis T. Stern 20 integrally includes a plurality of outwardly-extending lugs 24 along the upright height thereof to permit an operator to scale stem 20, particularly during original installation windmill tower A. The stem upper end at 21 and above platform 60 integrally includes handle means, herein as semi-circular bar 25 weldably attached to stem 20, to allow suspension of stem 20 and attached platform 60 including windmill 100 from a crane during original installation of windmill tower A. There is a plurality of pumping-rod guides 26 attached to stem 20 and extending laterally forwardly therefrom for pumping-rod 105, said guides 26 being vertically open along casing-axis C to provide a guidable lateral support for pumping-rod 105.

Substantially horizontal platform 60 is disposed on stem 20 immediately below stern upper end 21 and nearer to 21 than to base member upper end 11. Platform 60 has a rigidly positioned relationship to stem 20, as by means of abutting angle irons 65-66 and 68-69, oppose face plates 75-76 and transverse bolt or pin 74, said platform 60 having a forward portion 60F extending laterally forwardly of stem 20 across casing-axis C whereby casingaxis C is disposed between stem 20 and the platform transverse forward end 61. There is a vertical central opening 62 in the platform forward portion immediately below windmill 100 for passage of vertical pumping-rod 105. Platform 60 includes a rearward portion 60R terminating as transverse rearward end 63, said platform rearward portion being integrally provided with transverse planking 64 to support operating personnel on platform 60.

A preferred type platform member as 60 is best shown in the FIG. 3 plan view and in the two sectional elevational views based thereon and comprises a pair of transversely-opposed laterally extending edges 65 and 66 disposed on opposite sides of the laterally-extending vertical plane passing through axes T and C, hereinafter referred to as lateral reference plane. The platform forward portion i.e. between platform forward end 61 and axes T and C, is transversely narrower than the platform divergent rearward portion i.e. between tower-axis T and platform transverse rearward end 63. The peferred platform member 60 is basically provided of rigid elongate structural material of L-shaped dual-legged cross-sectional shape i.e. angle-iron rail stock, said elongate structural material being cut into five segments including two identical lengths for lateral members 65 and 66 and three identical shorter lengths for transverse rails-spacing members 67-69. The forward portion of lateral members 65 and 66 are parallel to each other from platform forward end 611 to rearwardly of tower-axis T; the upright legs of the members 65-66 opposed parallel forward portion are disposed on opposite sides of the said lateral reference plane (passing through axes T and C) and abut each opposite transverse side of stem 20 immediately below stern upper end 21 whereby the horizontal legs of said members forward portion are below stem upper end 21 and extend in opposite transvese directions. Rails 65 and 66 rearwardly of tower-axis T and herein at third transverse rails-spacer 69 are permanently bent in divergent directions so as to support transverse planking 64 thereon.

The three transverse rails-spacing members 67-69 each intersect said lateral reference plane and are attached as by welding between upright legs of rails 65 and 66. First rails-spacer member 67 is disposed at platform forward end 61. The upright legs of second and third railspacing members 68 and 69, respectively, abut the opposite lateral sides of stem 20 immediately below stem upper end 21 whereby the horizontal legs of 68 and 69 are below stem upper end 21 and extend in opposite lateral directions. Thus, the horizontal legs of the several members 65-69 are disposed along a common horizontal plane located a few inches below stem upper end 21. The forward portions of lateral members 65 and 66, together with transverse rails-spacer members 67 and 68, do provide the vertical central opening 62 immediately below windmill 100 to accommodate pumping-rod 105.

There is a pair of metallic triangular upright face plates and 76 disposed on opposite transverse sides of said lateral reference plane, the said face plates 75 and 76 being attached, as by welding, to the upright legs of platform lateral arms 65 and 66, respectively. A transverse attachment pin, herein as a threaded bolt and nut combination 74, passes through face plates 75-76 and intervening stem 20 immediately below members 65-66 whereby said attachment pin 74 maintains the elevation of platform member 60 immediately below stem upper end 21. The upright leg portions of elements 65-66 and 68-69, abutting against respective directional sides of stem 20', prevent tilting of platform member 60 in the lateral and transverse planes passing through tower axis T. Thus, elements 65-66, 68-69, and 74-76, together rigidly position the relationship between platform 60 and stem 20.

One of the platform lateral edges, herein along rail 66, is provided with a vetrically open annular collar 72 positioned transversely perpendicularly alongside casing-axis C and pumping-rod 105, said collar 72 being attached as by welding to a notch in the horizontal leg of rail 66. The inside diameter of collar 72 exceeds the outside diameter of each pipe string segment eg, 92, 91, etc. The transverse distance of the collar 72 central opening from the lateral reference plane is less than about six inches per ten feet of the collar 72 height above the earths sur face when steel pipe segments 91, 92, having a diameter of less than two inches, is employed. There are blockand-tackle attachment means, herein as transversely open lug or ear 71, attached as by welding to the upright leg of lateral rail 66, transversely" alongside collar 72.

Windmill is attached upon platform 60 at the upper end of pumping-rod as by means of four upright brackets 41, each of said brackets 41 extending integrally uprightly from platform forward portion 60F and converging toward tower-axis T above platform 60. Specifically herein, each of the four upright brackets 41 is cut to substantially identical lengths from angle-iron stock similar to that for elements 65-69, but of dimensionally smaller cross-sectional size, two of the brackets 41 being atttached as by welding to first rail 65 and two brackets 41 being similarly attached to second rail 66. Each of the upwardly convergent brackets 41 uprightly abuts and is attached to, as by bolting, to at respective upwardly convergent support-leg 101 of windmill tower r100.

Windmill tower A includes as stabilizing means a plurality of oblique braces connected to the platform member, each of said braces extending downwardly from the platform obliquely to tower-axis T and being removably attached to the earth. The said plurality of oblique braces preferably takes the form of a novel rigid ladder 50 comprising a pair of upwardly-converging rigid side members 55 and 56 connected together with a plurality of rigid horizontal transverse rungs 54; the side-member oblique braces 55 and 56 are each attached to platform 60 at separate stations on the platform rearward end 63 and extend obliquely downwardly from platform rearward end 63 to the earth. Specifically, the respective upper ends of ladder side-members braces 55 and 56 at ladder upperfonward end 51 is each provided with an attached I-I- shaped bracket 53 whereby a bifurcate clevis is provided on the upper-forward end of the respective side-members 55 and 56. The upright legs of the respective rails 65 and 66 at platform rearward end 63 fit between the bifurcate clevis of the respective bracket 53, and a transverse pivot pin 57 is employed with each bracket 53 to pivotably attach first side-member brace 55 to first platform rail 65 and to pivotably attach second side-member brace 56 to second platform rail 66. Ladder side-members 55 and 56 are downwardly divergent whereby the spacing of sidemembers 55 and 56 at ladder lower end 52 is dimensionally greater than at ladder upper end 51. There is a pair of upright ground-stakes 58 firmly implanted into the earth at ladder lower end 52, transverse pivot pins 59 being employed to removably attach the respective sidemember braces 55 and 56 to separate ground-stakes 58.

Additional oblique-bracing stabilization means are advantageously employed at platform forward end 61 in the event that a relatively large size windmill 100 is to be carried atop platform 60. For example, platform 60 at platform forward end 61 might carry an eye-bolt 47 attached as by welding to one or both of platform rails 65 and 66. An elongate cable guy-wire e.g. 45, 46, is attached to platform 60 as by means of an eye-bolt 47, each respective guy-wire extending obliquely downwardly and forwardly of platform 60 and being removably attached to the earth as by means of eye-bolt type groundstakes 48. If two or more guy-wire stabilization means are employed, they should be non-parallel and downwardly-divergent as shown herein with guy-wire elements 45 and 46.

Typical erection and installation of the windmill tower A of the present invention, including pumping-rod 105 along casing-axis C, is as follows. First, a hole is excavated into the earth E rearwardly of casing-axis C, and base member is permanently vertically implanted into the earth by pouring concrete into the excavation and around the lower portions of base member 10 including at base member lower end 12 and at lugs 13. After the concrete footing 15 has hardened to secure base member 10 along vertical tower-axis T, stem is laid horizontally upon the earth and platform 60 together with attached windmill 100 is attached to the stem upper portion 21 utilizing face plates 75-76 and attachement pin 74. Then, stem 20 is vertically suspended at handle means from a lofty portable crane mechanism (not shown), and the stern tower portion between stem lower end 21 and stem protuberance 23 is inserted into the base member 10 commencing downwardly from base member upper end 11 whereby stem protuberance 23 rests upon base member upper end 11 to maintain stem upper end 21 and platform 60 a lofty distance above the earth. Then, the installer ascends stem 20 utilizing stem lugs 24 to arrive at platform 60 whereupon oblique braces 45, 46

and 50, can be installed, the heavier element 50 being simultaneously carried to platform level with the said crane means. Pumping-rod is fed upwardly through vertically-open guides 26 by personnel at ground level, and the installer atop platform 60 operatively attaches pumping-rod 105 to the windmill 100. Finally, at ground level, the oblique braces e.g. 50, 45, 46, are removably attached to the earth as previously indicated.

Operation of the windmill tower A in the typical servicing situation where pipe string 91-92 or pumping-rod 105 is to be upwardly withdrawn from well W is as follows. In the case of shallow wells (of less than about feet in depth and the pipe string is of relatively small diameter and transversely resiliently bendable), a conventionally manually operable block-and-tackle is removably suspended from lug 71 and the pipe string and disconnected pumping-rod 105 are pulled upwardly there- With, said casing being guided upwardly through transversely offset collar 72. However, in the particular case of deep wells (of greater depth than about 150 feet), where a transportable crane is used to upwardly withdraw the pipe string from the well, it is first necessary that upright stem 20 be rotated at least 90 about toweraxis T in order that the platform member be removed from the locus of tower-axis T as indicated in phantom line in FIG. 3. In such instance, stem 20 is first rotationally freed with respect to base member '10 as by release of the set screw or similar means 29. Then, the oblique brace means e.g. 45, 56, 50, are temporarily freed from the earth, as by removal of pins 59, or by uncoupling of guy-wires 45-46 from their earth connectors 48. In the case of a relatively short stem 20, and a short base member 10, stem 20 can be rotated the required 90 about tower-axis T, simply by the use of a pipe wrench applied to stem 20 by an operator standing alongside base member 10, However, in the case of more massive stem and base members, the operator may manually grasp the ladder-side members 55-56 at ladder lower end 52, thus employing oblique ladder 50 as a lever to cause rotation of stem 20 and associated platform 60 about tower-axis T. The novel ladder 50 not only functions advantageously as aforesaid for oblique bracings and as a lever for rotating stem 20, but its oblique nature further provides an exceedingly convenient means for ascending to platform 60 at planking 64, much safter to use than the steep upright lugged stem 20, 24.

From the foregoing, the construction and operation of the windmill tower will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

I claim:

1. A windmill tower for operating and servicing a well having an upright casing extending deeply into the earth along a vertical casing-axis and a subterranean pump for upwardly withdrawing water therefrom, said windmill tower comprising:

(A) An upright base member attached to the earth and disposed along a vertical tower-axis, said toweraxis being substantially parallel to the casing-axis and laterally rearwardly offset therefrom for a finite distance, said base member having an upper end disposed above the earth surface;

(B) An upright lofty stem disposed along said toweraxis and extending loftily above the base member upper end and including a stem upper end, said stern being rotatably secured to the base member above the earth whereby the stem is adapted to turn at least about 90 about said vertical tower-axis;

(C) A substantially horizontal platform member attached to the stern and disposed on said lofty stem nearer to the stem upper end than to the base mem ber upper end, said platform member having a forward portion extending laterally forwardly of the upright stem to intersect the vertical casing-axis whereby the casing-axis is disposed between the platfrom transverse forward end and the tower-axis, said platform having a rearward portion including a transverse rearward end positioned rearwardly of the tower-axis, said platform member including a windmill supported upon the platform forward portion, and a lofty vertical pumping-rod disposed along the casing-axis and operatively connected between the windmill and the subterranean pump; and (D) A plurality of oblique braces connected to the said platform member, each of said braces extending downwardly from the platform obliquely to the tower-axis and removably attached to the earth.

2. The windmill tower of claim '1 wherein the base member at the upper end is cylindrically tubular and is concentric about the tower-axis, said base member lower portion at the earth surface being rigidly affixed within a concrete slab whereby the base member is non-rotatable about the tower-axis; and wherein the upright stem is of cylindrical tubular shape along the upright height thereof between the stem upper and lower ends, said stem lower portion extending downwardly into the base member tubular upper portion and including an outward protuberance resting upon the base member upper end whereby the stem is maintained in elevation above the earth and is rotatable about the tower-axis.

3. The windmill tower of claim 2 wherein the upright stem above the base member upper end integrally includes outwardly extending lugs to permit an operator to climb upwardly along the stem to the platform member; wherein the plurality of oblique braces comprises a substantially rigid ladder having a pair of rigid oblique side-members connected together with a plurality of rigid transverse rungs, the upper ends of the ladder side-members being each pivotably connected to the platform rearward portion with transverse pivot pins and the lower ends of the ladder side-members being disposed rearwardly of the ladder side-members upper ends and above the earth surface, the lower end of each of the ladder side-members being removably attached to a ground stage; and wherein there are means connected between the stem lower portion and the base member to temporarily prevent rotation of the stem about the tower-axis.

4. The windmill tower of claim 3 wherein there is a handle means attached to the stern and extending above the stem upper end and above the platform member for suspending the stem and the attached platform member from a crane during original installation of the windmill tower; and wherein the plurality of oblique braces further comprise at least one cable attached to the platform forward portion and extending downwardly and forwardly from the platform forward end, the lower end of said at least one cable being removably attached to the earth.

5. The windmill tower of claim 1 wherein the platform member has a pair of transversely-opposed laterally-extending edges disposed on opposite sides of the laterallyextending vertical plane passing through the tower-axis and the casing-axis, said platform member integrally including a vertically open collar disposed transversely of the casing-axis, said platform member further including a block-and-tackle attachment means disposed substantially immediately below the vertically open collar; and wherein the windmill has a plurality of downwardly extending lofty support legs of rectangular horizontal crosssection, said platform member forward side integrally including upwardly-extending lofty brackets of L-shaped horizontal cross-section abutting against two of the lofty sides of each of the windmill support-legs.

6. The windmill tower of claim 5 wherein the two transversely-opposed laterally-extending edges of the platform member at the rearward portion thereof diverge from each other whereby the platfom transverse rearward end is wider than the platform transverse forward end; and wherein the platform member rearward portion is provided with attached transverse planks to support an operator upon the platform.

7. The windmill tower of claim 6 wherein the base member at the upper end is cylindrically tubular and is concentric about the tower-axis, said base member lower portion at the earth surface being rigidly affixed within a concrete slab whereby the base member is non-rotatable about the tower-axis; and wherein the upright stem is of cylindrical tubular shape along the upright height thereof between the stem upper and lower ends, said stem lower portion extending downwardly into the base member tubular upper portion and including an outward protuberance resting upon the base member upper end whereby the stem is elevated above the earth and is rotatable about the tower-axis.

8. The windmill tower of claim 7 wherein the upright stem above the base member upper end integrally includes outwardly extending lugs to permit an operator to climb upwardly along the stem to the platform member; wherein the plurality of oblique braces comprises a substantially rigid ladder having a pair of rigid upwardlyconverging oblique side-members connected together with a plurality of rigid transverse rungs, the upper ends of the ladder side-members being each pivotably connected to the platform rearward portion with transverse pivot pins and the lower ends of the ladder side-members being disposed rearwardly of the ladder side-members upper ends and above the earth surface, the lower end of each of the ladder side-members being removably attached to a ground stake; and wherein there are set screw means connected between the stem lower portion and the base member to temporarily prevent rotation of the stem about the tower-axis.

9. The windmill tower of claim 8 wherein there is semi-circular handle means attached to the stem upper end and disposed above the platform member for suspending the stem and the attached platform member from a crane during original installation of the windmill tower; and wherein the plurality of oblique braces further cornprises at least one cable attached to the platform forward end and extending downwardly and forwardly from the platform forward end, the lower end of said at least one cable being removably attached to the earth.

1-0. The windmill tower of claim 6 wherein the two laterally-extending sides of the platform comprise single lengths of metallic rail stock including parallel forward portions of each rail and divergent rearward portions of each rail, the stem upper end fitting snugly between the parallel forward portions of the opposed lateral rails and between a pair of transverse rail-spacers on respective lateral sides of the tower-axis, each of said opposed rails having an attached laterally-extending face plate, said opposed face plates and intervening stem being pierced I by a transverse attachment pin.

References Cited UNITED STATES PATENTS 419,526 1/1890 Keep 103-59 3,099,220 7/1963 Butman 10358 ROBERT M. WALKER, Primary Examiner

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Cited By (9)

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US4217738A (en) * 1978-08-02 1980-08-19 Smith Paul R Windmill tower
AT382688B (en) * 1985-01-17 1987-03-25 Thaller Heinrich Ing Mounting for a high-power wind converter or wind generator for the generation of electrical current
US20050129504A1 (en) * 2002-02-12 2005-06-16 De Roest Anton H. Wind turbine
US20060272244A1 (en) * 2003-03-19 2006-12-07 Jensen Soren P Method of contructing large towers for wind turbines
US20070006541A1 (en) * 2003-08-09 2007-01-11 Marc Seidel Tower foundation, in particular for a wind energy turbine
US20090031639A1 (en) * 2007-08-03 2009-02-05 Cortina Cordero Alejandro Pre-stressed concrete tower for wind power generators
US20100071995A1 (en) * 2008-09-24 2010-03-25 Campbell Jr Wayne S Wind turbine tower base access ladder
US20110140447A1 (en) * 2010-11-10 2011-06-16 Ingo Paura Reinforcement assembly for use with a support tower of a wind turbine
US20120107149A1 (en) * 2010-10-27 2012-05-03 Carlos Wong Wind turbine energy storage system and method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217738A (en) * 1978-08-02 1980-08-19 Smith Paul R Windmill tower
AT382688B (en) * 1985-01-17 1987-03-25 Thaller Heinrich Ing Mounting for a high-power wind converter or wind generator for the generation of electrical current
US20050129504A1 (en) * 2002-02-12 2005-06-16 De Roest Anton H. Wind turbine
US7160085B2 (en) * 2002-02-12 2007-01-09 Mecal Applied Mechanics B.V. Wind turbine
US20060272244A1 (en) * 2003-03-19 2006-12-07 Jensen Soren P Method of contructing large towers for wind turbines
US7802412B2 (en) * 2003-03-19 2010-09-28 Vestas Wind Systems A/S Method of constructing large towers for wind turbines
US7877944B2 (en) * 2003-08-09 2011-02-01 General Electric Company Tower foundation, in particular for a wind energy turbine
US20070006541A1 (en) * 2003-08-09 2007-01-11 Marc Seidel Tower foundation, in particular for a wind energy turbine
US20090031639A1 (en) * 2007-08-03 2009-02-05 Cortina Cordero Alejandro Pre-stressed concrete tower for wind power generators
US7739843B2 (en) 2007-08-03 2010-06-22 Alejandro Cortina-Cordero Pre-stressed concrete tower for wind power generators
US20100071995A1 (en) * 2008-09-24 2010-03-25 Campbell Jr Wayne S Wind turbine tower base access ladder
US20120107149A1 (en) * 2010-10-27 2012-05-03 Carlos Wong Wind turbine energy storage system and method
US8896144B2 (en) * 2010-10-27 2014-11-25 Carlos Wong Wind turbine energy storage system and method
US20110140447A1 (en) * 2010-11-10 2011-06-16 Ingo Paura Reinforcement assembly for use with a support tower of a wind turbine

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