US2309769A - Transformer gin - Google Patents

Transformer gin Download PDF

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US2309769A
US2309769A US410565A US41056541A US2309769A US 2309769 A US2309769 A US 2309769A US 410565 A US410565 A US 410565A US 41056541 A US41056541 A US 41056541A US 2309769 A US2309769 A US 2309769A
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Prior art keywords
pole
fixture
gin
chain
transformer
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US410565A
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David C Hubbard
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Chance AB Co
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Chance AB Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/20Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures
    • B66C23/203Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes with supporting couples provided by walls of buildings or like structures with supporting couples provided by posts, e.g. scaffolding, trees or masts
    • 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00Buckles, buttons, clasps, etc.
    • Y10T24/14Bale and package ties, hose clamps
    • Y10T24/1412Bale and package ties, hose clamps with tighteners
    • Y10T24/1441Tangential screw

Description

Feb. 2, k1943. D. e. HUBBARD A 2,309,769
TRANSFORMER GIN Filed Sept. 12, 1941 3 Sheets-Sheet 1 Feb- 2, 1943- -D. c. HUBBARD TRANSFORMER `GIN Filedsept. 12. 1941 3 Sheets-Sheet 2 Feb. 2,1943. D C, HUBBARD 2,309,769
` TRANsFoRMER-GIN I Filed sept.' 12, 1941, Y s sheets-sheet s4 Patented Feb. 2, 1943 TRANSFORMER. can
David C. Hubbard, C'entralia, Mc., assigner to A. B. Chance Company, Centralia, Mo., a corporation of Missouri Application September 12, 1941, Serial No. 410,565
c claims. (0,1.,248-231) V The present invention relates to transformer gins, and is particularly concerned with the provision of an improved gin for use in hoisting transformers to the top of transmission line poles so that the transformer can be secured to the pole in any desired position.
One of the objects of the invention is the provision of a transformer gin of the class described which is light so that it requires a minimum amount of steel, but it is also sturdy and so constructed that it is adapted to lift very heavy weights without any possibility of breakage of its parts.
Another object of the invention is the provision of an improved transformer gin of the class described which is adapted to be secured on a pole so firmly that there is no possibility of an accident or of the securing means coming loose during the lifting of a transformer.
Another object of the invention is the provision of an improved transformer gin of the class described which is adapted to be attached to a line pole at any desired point and also adapted to be attached to the pole and the cross arm so that it is best located when the transformer is to hang from the cross arm.
Another object of the invention is the pro- Vision of an improved transformer gin which is simple, capable of economical manufacture and sale, light, and sturdy.
Another object of the invention is the provision of a tool or device of the class described, adapted to be used in connection with an adjacent line pole for lifting all sorts of devices, such as, for example, loading or unloading a pole from a vehicle.
Another object of the invention is the provision of a device of the class described which is adapted to be secured very firmly to the pole, but in which the securement or removal can be effected very quickly so that time and labor are saved by the use of the device.
Another object of the invention is the provision of an improved device of the class described, which has provision for preventing the twisting of the ropes of the block which is used for lifting the transformer or other article.
Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings, in which similar characters of reference indicate similar parts throughout the several views.
Referring to the three sheets of drawings accompanying this specification,
Fig. 1 is an elevational View showing two of the transformer gins attached to a line pole in dierent ways;
Fig. 2 is a front elevational View of the trans'- former gin apart from the pole;
Fig. 3 is a side elevational view of the transformer gin, partially broken away, to show vertical sections of the structure at important points;
Fig. 4 is a horizontal sectional view on a larger scale, taken on a plane at right angles to the pole and passing through theaxis of the securing bolt 12.
Fig. 5 is a horizontal sectional view, takenv on the plane of the line 5 5 of Fig. 3, looking in the direction of the arrows;
Fig. 6 is a horizontal sectional view, taken on the plane of the line 6 6 of Fig. 3, lookingrin the direction of the arrows;
Fig. 7 is a fragmentary elevational view ofthe chain locking means, taken on the plane of the line 1 1 of Fig. 4;
Fig. 8 is Va fragmentary sectional View, taken on the plane of the line 3 8 of Fig. '7;
Fig. 9 is a fragmentary sectional View, taken on the plane of the line 9 9-of Fig. 1.
Fig. 10 is a fragmentary top plan view,'shown in partial section, the section being on the plane of the line 9 9 of Fig. 1.
Referring to Fig. 1, I0 indicates a line pole which is provided with a cross arm I l, and which is used to illustrate the application of the two devices I2 and IZA embodying the invention.
The transformer gins I2 and I2A are identical in construction, but illustrate different points of application of the gin to a pole. The gin which is indicated by the numeral I2, for example, preferably consists of an upwardly extending beam or column I3, which is formed of one or more steel bars of standard cross section I4, I5. For example, the bars I4, I 5 are preferably of substantially V shaped cross section, the two angular sides I6, I1, and I8.I I9 being in each instance joined by a flat yoke 2Il or 2|.
The'width o-f the side'ilanges I8, I9 is preferably slightly less than that of the side flanges I6 and I1 so that when the V bars are nested the yoke 20 is spaced slightly. from the yoke 2l, and the rounded edges 22, 23 are close enough to each other to be welded together at 24.
These bars are preferably welded together at both edges, at a plurality of points 24, equally spaced from each other from the bottom to the top of the beam, as indicated by the numerals in Fig. 1.
The flat yokes 2U, 2l provide a rm bearing for engaging the bolts which secure other fixtures to the beam, and they also provide a fiat bearing for securement of the overhanging arm 25, which is secured to the upper and outer end of the beam I3. This overhanging arm may comprise a cast metal member, the structure of which is best illustrated in Figs. 3 and 5. It may be provided with a vertical portion 26, a horizontal portion 21, and a diagonal bracing portion 28 integrally joined together to form a triangle.
All three of these portions may be of substantially T shape in cross section, having outwardly extending ribs at each side and an inwardly extending web 30, except that the vertical por' tion preferably has its web thickened beneath the nut 3| of the screw bolt 32, to provide a better bearing surface for the nut and a better body for the bore 33, which passes the bolt 32.
The two yokes 20, 2| (Fig. 5) of the beam are provided with registering apertures 34 for passing the bolt 32, the head of which engages the inner fiat surfaceA of the yoke 20. The vertical portion 26 of the arm 25 is preferably of sufcient width to embrace the outer surface of the yoke 2| (Fig. 5), and is also preferably provided with rearwardly extending lugs 35, 36 on each side of the yoke 2|, engaging outside the side flanges I8, I 9.
From another point of view, the lugs 35, 36 might be regarded as rearward extensions of the upper portion 21 and the diagonal portion 28 of the arm 25. These lugs engage the opposite sides of the beam and prevent any teetering or turning of the arm relative to the beam so that it can be secured tightly in place by a single bolt 32.
The diagonal bracing portion 28 joins the horizontal portion 21 of the arm 25 at a point 31 inwardly of the end of the arm, and the horizontal portion 21 may be thickened and extended to provide a means for support of a swivel eye 38. This end portion of the arm 25 is provided with a vertically extending bore 39 for receiving the screw bolt 40. The eye may consist of a drop forged steel member having a substantially circular eye aperture 4I formed by a curved portion 42, which itself is preferably circular in cross section.
This curved portion is joined to a flat bearing flange portion 43 at the top, which has an upper flat surface 44 for engaging the lower flat surface 45 on the end portion of the arm 25. A threaded bore 56 is provided in the upper part of the swivel eye 38 for receiving the threaded portion of the screw bolt 4D.
The screw bolt 4D is preferably of such length that When the head is resting on top of the arm 25 and its end is threaded into the bore 46 and there is suicient tolerance so that the swivel eye turns freely with the bolt in the bore 39, the lower end of the bolt may be riveted over at 41 to make sure that these parts will never separate and never bind.
The bolt may then be provided with one or more punched deformations III, which so deform the threads that the riveted end of the bolt cannot rotate in the swivel eye. There is no danger of the threads of the bolt taking up the clearance which is desired.
The swivel eye 33 is used for receiving the hook 48 of the upper pulley 49 of a pulley block. The swivel eye turns freely to permit the ropes of the pulley block to be kept untwisted and to permit the operator to pull on the block from any direction.
Referring to Fig. l, the pulley block may be of any standard construction, having a lower pulley 58 provided with a hook 5| for supporting a transformer 52 by means of a rope 53. At its lower end the beam I3 is preferably provided with a pole-engaging fixture, which is best illustrated in Figs. l, 3, and 6. This pole-engaging fixture may consist of a cast metal member which is provided with beam-engaging surfaces 5d, 55, 56 complementary in shape and size to the inside of the innermost bar flanges I6, I1 and 20.
At its lower end this fixture 51 is provided with a laterally projecting fiange 56 at each side, which may engage under the ends of the bars I4, I5 of which the beam is made. This fiange helps to transfer the weight from the beam to the fixture 51.
The inner surface of the pole-engaging fixture 51 may be curved at 59, but it is provided at each end with an integral prong 6D, 6I, the prongs being equal in length and similar in shape and extending at substantially right angles to the yoke 2| or 2) of the beam.
The prongs 60, 6| extend in such a direction that they are adapted to 4engage in the line pole, and they are spaced from each other in such manner that they engage the opposite sides of the line pole. The curvature 59 in the fixture provides sufficient clearance so that the prongs may be driven into the line pole when the gin is secured to the pole as shown at the left in Fig. l.
The fixture 51 is secured to the lower end of the beam by providing the yokes 20, 2| of the beam with a pair of registering apertures 62, 63 for receiving a screw bolt 64.
The fixture has a threaded bore 65 registering with the apertures 62, 63, and the screw bolt has its threaded end driven home in the bore 65 until the fixture is drawn tightly into the beam. Since its fiat sides engage the fiat inner surface of the flanges I6 'and I1 of the yoke 25, there is no possibility of the fixture 51 rotating, and one bolt is sufficient to secure it tightly to the beam.
In order to save material this fixture 51 may be made hollow at 66, giving it a substantially trapezoidal shape, with a curved wall toward the pole.
The gin is provided intermediate its ends, and preferably near the lower end, with a securing fixture 61, best shown in Figs. l, 3, and 4. This securing fixture may comprise a cast metal member which is adapted to embrace the beam I3 by means of the three fianges 68, 69, and 1I), and a yoke 1I. The flanges 68 and 10 and the yoke 1| have flat inner surfaces substantially complementary to the outer flat surfaces of the beam I3.
The yoke portion 1| is preferably thickened to provide suicient body for supporting the bolt 12, which is located in a bore 13, and also passes through the registering apertures 1li, 'I5 in the yokes 2B, 2| of the beam.
When the bolt 12 has its nut driven home, this xture draws the beam into tight engagement with the anges 6B and 10 so that the fixture is firmly secured to the beam. The point of securement of the fixture is preferably such that it is spaced from the pole-engaging fixture 51 and also so that the prongs 60, 6I may be located below the cross arm II when the securing fixture 61 is located above the cross arm in the position shown at the right hand of Fig. 1. Thus the prongs 60, 6I do not interfere with the attachment of the device to the pole and cross arm.
The beam-engaging flanges 68, 16 and transverse flange 69 are preferably provided with narrow extension flanges 1B, 11, which may be joined by a horizontal Web 18. The extension :flanges 1B and 11 are provided with what may be called chisel-shaped extensions or prongs 19, 89 adapted to engage in the Wood of the pole, and the web 18 is curved so that it will not strike the pole except when the prongs 19, 89 are engaged in the wood of the pole.
The extension fiange 11 is .preferably provided on its outside with a chain securing lug 8|, comprising an integral flange having a transverse bore 82 for receiving the end link 83 of a galvanized steel chain 84.
The chain 84 is of sufficient length so that it will embrace any pole or tree or other member with which the gin is intended to be used.
The web 18 is preferably provided with a diagonally extending guide groove, the walls 95, 86 of which are 'adapted to guide the rectangular shank 8'! of a screw bolt. The screw bolt 81 is slidably mounted in the groove between walls B5, 8S and passes through the diagonal and rectangular aperture 88 in the flange 15.
The threaded end 89 of the bolt 81 passes through a diagonal aperture Which is located substantially at the corner cf the flanges 59 and 11, and the bolt emerges from the fixture at the bore 98, where the fixture has an external fiat thrust surface 9|.
The threaded end of the bolt has a nut 92, provided with a laterally projecting arm 93, having a ball 99 at the end for engagement with the hand. At its opposite end the bolt 81 is formed With an eye 95 for receiving a screw bolt 95. The bolt 81 extends diagonally of the fixture 61, and is so arranged that it is substantially tangential with respect to the periphery of the pole 91, the curved part of the eye 95 being turned inwardly.
The eye 95 and bolt 9S support a chain lock 98, which may consist of a cast metal or a drop forged member, having a pair of parallel iianges 99 and |99 spaced sufficiently to receive the eye 95. The fianges 99 and |99 have a pair of reg.- istering apertures Il, |92, and the screw bolt 9B passes through these apertures and .thro-ugh the eye 95, and is secured by a nut |99.
The flanges 99, |99 are spaced by a groove lll-ll suiciently to receive the eye 95 and permit pivotal movement, and the main body of the chain lock 98 is provided at its opposite end with horizontally extending groove |95 of sufficient width to receive one of the chain links ,When it is moved edgewise into the groove |95.
In addition to the groove |95, the chain lock 98 is provided with a curved recess |98 of suicient width and curved laterally to fit the end of one of the chain links, as seen in connection With the chain link indicated at 84 in Fig. 7.
The recess |96 receives a chain link in transverse position so that the end surface |91 of that chain link engages the curved inner surface le@ to retain the chain in the lock. The surface it of the recess |99 curves backwardly to a point at |09 sufficiently so that the ridge |99 is rearward of the engaging part |01 of the link llt. Thus there is no danger of the link 84 escaping from the chain lock when a tension is placed on the chain. The balance of the chain, indicated in dotted lines in Fig. 8, hangs loosely from the chain lock.
The use and operation of the transformer gin is as follows: When the gin is to be applied to a pole above the cross arm, the bolt 12 is loosened and removed, and the beam I3 is slid out of the aperture in the fixture 61. The beam is then applied with the surfaces of its inner iianges I6, |1 engaging the backside of the fixture 61, which is suitably shaped for this purpose, and the bolt is again inserted through the beam and the nxture 61 and tightened.
For this purpose it will be evident, that, although the outside of the fixture |51 is relieved at |28 (Fig. 4) there is provided a vertically-exe tending rib With a flat outer surface at 2| on each side and additional flat surfaces in the same plane at |22, |23.
The back edge or face of the fixture 61 is flat at |24 and of a size adapted to fit on the inside of the beam I3. Thus a single bolt is also adapted to secure the fixture 61 in front of the beam so that the fixture 61 has a greater width in front of the beam. The width of the fixture in this case is suiiicient to traverse the cross arm, and the lower part of the fixture 61 is permitted to rest on the cross arm, while the curved surface on the web 18 engages the side of the pole above the cross arm.
The gin is then applied to the pole as follows:
The nut 92 is backed off until it approaches the end of the bolt so that there are plenty of threads to take up tension, and the chain is passed around the pole, and the links which are closest to the chain lock are inserted in the chain lock, in the manner shown in Figs. '1 and 8.
Then the nut 92 is tightened by means of its handle 93, 9d until the prongs 19, 89 are drawn into the pole, and the gin is firmly secured on the pole by means of the chain 84.
In this case the weight of the gin is borne partly by tlie cross arm Il, and the lower flat sur-V,
face H9 of the fixture 61 engaging the fiat top of the cross arm aids in preventing the tipping orteetering of the gin on the pole. The .beam I3 then extends in substantially vertical position, as the anges 16, 11 and web 18 are preferably made Aof sufficient width to traverse the cross arm.
such case the beam acts more like a column than,
it does a cantilever, and its effective strength is accordingly increased as it approaches the vertical position.
The transformer 52 may be hung on the blocks which extend downwardly from the swivel eye 38; and the transformer having already been provided with cross arm hooks, it may be lifted, swung over, and placed on the cross arm, With the hooks on either side of the pole. In this con-` nection it should be noted that the length ofthe gin is preferably such that it is longer than the combined length of the swivel eye, block and tackle, hook, and parts of the transformer which are above the transformer brackets, so that the transformer can be lifted Well above the place where it needs to be lifted to be placed on the cross arm.
In order to release the gin from the pole it is only necessary to back oif the screw 92 a short distance, when the chain will be loose enough to have its link 84 moved out beyond the hooked surface |99 of the chain lock 98.
When the gin is to be used for securement to a pole and not in connection With the cross arm, it
is applied as shown at the left of Fig. 1, and the two lower prongs 68, Si are adapted to engage the pole. The two upper prongs '19, 8 are also adapted to engage the pole, and the chain is secured about the pole and fastened in the chain lock in the same manner previously described.
When the nut 92 is driven home, tensioning the chain, the prongs EQ, 6| and 19, 80 are driven into the pole and find firm securement for preventing the tilting of the gin through their engagement in the wood of the pole.
The chain extending about the pole is a very certain and satisfactory and powerful mode of securing the gin to the pole, as there is no possibility of the chain being released from the chain lock 98 as long as tension is applied by means of the bolt 8'! and nut 92.
The gin has a four point engagement with the pole, in addition to the curved surfaces on the web 'I8 and the curved surface 59 on the fixture 51. Although the gin extends at a slight angle in this case, as shown in Fig. 1 at the left, it is still approximately in Vertical position and attains a maximum effective strength for its size and section.
The present gin may be used not only for lifting transformers, but for lifting poles for other equipment, and it is perfectly safe and certain in its attachment to the pole and to the block and tackle.
'Ihere is no danger of the tackle becoming twisted and no danger of the gin tilting, when properly applied. It can be applied to a pole very quickly.
While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:
l. In a transformer gin, the combination of a column member adapted to extend substantially longitudinally of a line pole, said column member comprising a pair of structural steel members nested and welded together, said structural steel members each having a pair of diagonally extending fianges joined by a substantially flat yoke, means carried by one end of said column for attachment of a load, and prolonged means carried by the other end of said column for engagement in the wood of a pole, and a metal securing fixture carried intermediate the ends of said column, having a chain secured to one side thereof and adapted to extend about a pole having means for engaging the other end of said chain and tightening the chain about the pole.
2. In a transformer gin, the combination of a column member adapted to extend substantially longitudinally of a line pole, said column member comprising a pair of structural steel members nested and welded together, said structural steel members each having a pair of diagonally extending flanges joined by a substantially fiat yoke, means carried by one end of said column for attachment of a load, and pronged means carried by the other end of said column for engagement in the wood of a pole, and a metal securing fixture carried intermediate the ends of said column, having a chain secured to one side thereof and adapted to extend about a pole having means for engaging the other end of said chain and tightening the chain about the pole,
said means at the lower end of said column comprising a, cast metal member having engaging surfaces complementary to the inside of the diagonal fianges of said column, and threaded means for securing said cast metal member to said column.
3. A transformer gin comprising an elongated beam adapted to extend longitudinally of a pole, said beam being provided at one end with means for attachment of a hoist and being provided at its other end with means for xedly engaging a pole, a fixture for attachment to the beam intermediate its ends, said fixture being provided with an aperture having surfaces complementary to the shape of the beam for engagement with the beam in one position, and said fixture having surfaces on its rear side for complementary engagement with surfaces on the front of said beam whereby the beam may be attached in another position to the fixture, with the fixture projecting far enough to traverse a cross arm when the beam is extending longitudinally of the pole.
4. In a transformer gin, the combination of a cast metal fixture of substantially triangular form, having a pair of spaced prongs adapted to engage in a telephone pole, with a securing chain having one end secured to said fixture, a threaded bolt, said bolt extending substantially tangentially of the pole, and having a threaded member with a radially projecting lever for tightening of the chain, the other end of said chain being secured in a pivoted locking member carried by said bolt, said pivoted locking member having two slots at an angle to each other for receiving two of the links of said chain, and an upwardly extending column carried by said fixture, said column having at its upper end a fixed arm for supporting a transformer and at its lower end prong means for engaging the side of the pole.
5. In a transformer gin, the combination of a cast metal fixture of substantially triangular form, having a pair of spaced prongs adapted to engage in a telephone pole, with a securing chain having one end secured to said fixture, a threaded bolt, said bolt extending substantially tangentially of the pole, and having a threaded member with a radially projecting lever for tightening of. the chain, the other end of said chain being secured in a pivoted locking member carried by said bolt, said pivoted locking member having two slots `at an angle to each other for receiving two of the links of said chain, and an upwardly extending column carried by said fixture, said column having at its upper end a fixed arm for supporting a transformer and at its lower end prong means for engaging the side of the pole, said column having a pair of fianges extending at the same angle to each other as the sides of said triangular fixture, and said column having a yoke between said flanges engaging a complementary part of said fixture.
6. In a transformer gin, the combination of a cast metal fixture of substantially triangular form, having a pair of spaced prongs adapted to engage in a telephone pole, with a securing chain having one end secured to said fixture, a threaded bolt, said bolt extending substantially tangentially of the pole, and having a threaded member with a radially projecting lever for tightening of the chain, the other end of said chain being secured in a pivoted locking member carried by said bolt, said pivoted locking member having two slots at an angle to each other for receiving two of the links of said chain, and an upwardly extending column carried by said fixture, said column having at its upper end a xed arm for supporting a transformer and at its lower end prong means for engaging the side of the pole, said column having a pair of flanges extending at the same angle to each other as the sides of said triangular fixture, and said column having a yoke between said flanges engaging a complementary part of said fixture, said column being disposed in a triangular aperture in said xture for the purpose of maintaining the column in more nearly vertical position when the gin is used on the side of a pole.
DAVID C. HUBBARD.
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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499753A (en) * 1946-05-02 1950-03-07 Chance Co Ab Chain tightening and securing device
US2530740A (en) * 1948-09-13 1950-11-21 Elzie R Taylor Antenna mounting
US2694543A (en) * 1950-12-19 1954-11-16 Raymond W Norris Mirror support device
US2782003A (en) * 1954-02-08 1957-02-19 Wagoner Francis Eugene Wire stretcher
US2869210A (en) * 1955-04-18 1959-01-20 Plan Hold Corp Friction-type binder
US3167874A (en) * 1962-08-13 1965-02-02 William F Pogue Display sign support
US3226088A (en) * 1963-07-16 1965-12-28 American Telephone & Telegraph Apparatus for pulling cable through underground conduit
US3266775A (en) * 1963-12-02 1966-08-16 Coe Edgar Homer Lineman's gin pole
US3568797A (en) * 1969-04-10 1971-03-09 Willie R Hardy Sportsman{3 s base
US3673720A (en) * 1970-09-11 1972-07-04 William S Thornton Changeable sign
US4030704A (en) * 1975-07-25 1977-06-21 Carl Beierle Wire or cable reel support
FR2620692A1 (en) * 1987-09-17 1989-03-24 Perennes Rene Device for lifting and handling heavy items
US20030081993A1 (en) * 2001-10-30 2003-05-01 Michael Smith Threaded closure
US6685380B2 (en) * 2001-10-30 2004-02-03 Robbins & Myers Energy Systems, L.P. Threaded closure with chain binder
US7520398B1 (en) 2007-06-29 2009-04-21 Ledman James A Gin hoist
EP2693045A1 (en) * 2012-08-01 2014-02-05 Rotor Control GmbH Access system for performing inspection and maintenance work on tower-like structures
US20170101295A1 (en) * 2015-10-07 2017-04-13 William R. Walker Open wheel vehicle speed jack
US10266324B2 (en) 2016-09-20 2019-04-23 Michael William Horton Adjustable fastening device and method of using same
US20190269122A1 (en) * 2018-03-05 2019-09-05 William Delaney Lewis Tree stand
US10464788B1 (en) * 2017-11-14 2019-11-05 Guy Elli Bonifas Portable hoisting system

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499753A (en) * 1946-05-02 1950-03-07 Chance Co Ab Chain tightening and securing device
US2530740A (en) * 1948-09-13 1950-11-21 Elzie R Taylor Antenna mounting
US2694543A (en) * 1950-12-19 1954-11-16 Raymond W Norris Mirror support device
US2782003A (en) * 1954-02-08 1957-02-19 Wagoner Francis Eugene Wire stretcher
US2869210A (en) * 1955-04-18 1959-01-20 Plan Hold Corp Friction-type binder
US3167874A (en) * 1962-08-13 1965-02-02 William F Pogue Display sign support
US3226088A (en) * 1963-07-16 1965-12-28 American Telephone & Telegraph Apparatus for pulling cable through underground conduit
US3266775A (en) * 1963-12-02 1966-08-16 Coe Edgar Homer Lineman's gin pole
US3568797A (en) * 1969-04-10 1971-03-09 Willie R Hardy Sportsman{3 s base
US3673720A (en) * 1970-09-11 1972-07-04 William S Thornton Changeable sign
US4030704A (en) * 1975-07-25 1977-06-21 Carl Beierle Wire or cable reel support
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US20030081993A1 (en) * 2001-10-30 2003-05-01 Michael Smith Threaded closure
US6685380B2 (en) * 2001-10-30 2004-02-03 Robbins & Myers Energy Systems, L.P. Threaded closure with chain binder
US6742957B2 (en) * 2001-10-30 2004-06-01 Robbins & Myers Energy Systems, L.P. Method and device for threaded closure of pipelines or vessels
US6786670B2 (en) * 2001-10-30 2004-09-07 Robbins & Myers Energy Systems, L.P. Threaded closure
US7520398B1 (en) 2007-06-29 2009-04-21 Ledman James A Gin hoist
EP2693045A1 (en) * 2012-08-01 2014-02-05 Rotor Control GmbH Access system for performing inspection and maintenance work on tower-like structures
US20170101295A1 (en) * 2015-10-07 2017-04-13 William R. Walker Open wheel vehicle speed jack
US10358325B2 (en) * 2015-10-07 2019-07-23 William R. Walker Open wheel vehicle speed jack
US10266324B2 (en) 2016-09-20 2019-04-23 Michael William Horton Adjustable fastening device and method of using same
US10464788B1 (en) * 2017-11-14 2019-11-05 Guy Elli Bonifas Portable hoisting system
US20190269122A1 (en) * 2018-03-05 2019-09-05 William Delaney Lewis Tree stand

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