US3818657A - Telescopic mast - Google Patents

Telescopic mast Download PDF

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Publication number
US3818657A
US3818657A US00275879A US27587972A US3818657A US 3818657 A US3818657 A US 3818657A US 00275879 A US00275879 A US 00275879A US 27587972 A US27587972 A US 27587972A US 3818657 A US3818657 A US 3818657A
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US
United States
Prior art keywords
mast
tubular
fluid medium
latch member
clamping element
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00275879A
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English (en)
Inventor
E Frei
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KERN AG CONRAD
KERN C AG CH
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KERN AG CONRAD
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Publication date
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Publication of US3818657A publication Critical patent/US3818657A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/18—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures movable or with movable sections, e.g. rotatable or telescopic
    • E04H12/182—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures movable or with movable sections, e.g. rotatable or telescopic telescopic

Definitions

  • ABSTRACT A telescopic mast comprising guidingly interfitted tubular elements which can be extended into a terminal position by means of a pressurized medium at which each extended tubular element lockingly engages with and is releasably retained by a holding mechanism provided at a tubular element such extended tubular element retained by such holder mechanism.
  • Another and more specific object of the present invention relates to a new and improved construction of mast which can be quickly erected and dismantled in a troublefree manner, with a minimum amount of workers and a minimum need in material and which can also be easily transported.
  • a further significant object of the present invention relates to an improved construction of telescopic mast composed of interfitting tubular members which can be easily extended for erection purposes and similarly easily retracted for dismantling purposes and wherein the mast construction can be relatively simply and easily transported.
  • the aforementioned telescopic mast of this development is manifested by the features of guidingly interfitted tubular elements which can be extended into a terminal position by means of a pressurized medium.
  • Each extended tubular element can be locked and releasably held in position by a holder mechanism provided at a tubular element located externally of such extended tubular element.
  • FIG. 1 is a schematic front view of a telescopic mast designed according to the teachings of the present invention in a retracted position of the tubular elements;
  • FIG. 2 ia a front view of the telescopic mast of FIG. 1 with the tubular elements in their extended position;
  • FIGS. 3 and 4 are respective fragmentary longitudinal sectional views through the telescopic mast construction of FIG. 2;
  • FIG. 5 is a cross-sectional view of the telescopic mast construction depicted in FIG. 3, taken substantially along the line A-A thereof;
  • FIG. 6 is a cross-sectional view of the telescopic mast depicted in FIG. 3, taken substantially along the line BB thereof.
  • FIG. 1 there are illustrated the interfitting tubular elements of a telescopic mast M with these elements in their retracted position.
  • the outermost stationary tubular element 1 is visible and such is supported at the ground through the agency of a base plate 2 and anchored by means of the spanning or bracing cables 3.
  • These spanning cables or wires 3 are secured to a holder mechanism 4, the details of which will be discussed more fully hereinafter, and which holder mechanism 4 is arranged at the upper end of the tubular element 1.
  • first stationary tubular element 1 there are arranged a number of, in this case three, telescopically interfitting and extensible tubular elements 5, 6 and 7, wherein in such figure however only the ends thereof are visible.
  • the tubular elements 5 and 6 are likewise provided at such ends with holder mechanisms.
  • a withdrawal tube 8 equipped at its upper end with an indicator element, for instance a sighting mechanism 9 which indicates a certain height.
  • This withdrawal tube 8 can be fixedly retained in its momentary withdrawn position by means of a fixing mechansim 13 (FIG. 2) mounted at the tubular element 8 and which has not been particularly shown in FIG. 1.
  • FIG. 2 illustrates the tubular elements 1, 5, 6 and 7 of the telescopic mast M in their extended position.
  • the stationary tubular element 1 as already mentioned, is supported at the floor or ground by means of the base plate 2 and is anchored by means of the bracing or cables 3.
  • the second tubular element 5 is engaged and fixedly retained by the holder mechanism 4 at the first tubular element 1
  • the third tubular element 6 is engaged and fixedly retained by the holder mechanism lfl'arranged at the second tubular element 5
  • the fourth-tubular element 7 is engaged and fixedly retained by the holder mechanism 11 at the third tubular element 6.
  • the withdrawal tube 8 can be fixedly retained in position in order to prevent any axial displacement thereof.
  • the fixing mechanism 13 is, however, constructed in such a manner that the fixedly retained withdrawal tube 8 can be rotated upon overcoming a friction force by means of an aligning or adjusting lever 14. By downwardly tilting or otherwise suitably actuating the adjusting lever 14 it is possible to also secure the withdrawal tube 8 against rotation.
  • a line or cable 15 which is connected in a manner still to be described with the holder mechanisms 4, l and 11 and which can be seized from the ground or floor.
  • FIGS. 3 and 4 illustrate longitudinal sectional views through the lower portion of the telescopic mast M depicted in FIG. 2.
  • first stationary tubular element 1 with its holder mechanism 4 and a portion of the second tubular element 5.
  • the holder mechanisms and 1 1 are of the same construction as the holder mechanism 4 and guiding of the tubular elements 6 and 7 occurs in the same manner as the illustrated guiding of the tubular element 5 within the tubular element 1, so that it suffices to consider such aspects in conjunction with the components depicted in FIGS. 3 and 4.
  • the circular or round stationary first tubular element 1 is closed at its lower end by means of a closure plate 16 having an inlet valve 17 and a discharge or outlet valve 18. Furthermore, at such closure plate 16 there are welded two parallel flanges 19 which are disposed perpendicular to the closure plate 16, and each of which flanges l9 possesses a respective opening.
  • a respective bolt member 20 is rotatably inserted through each such opening and these bolt members are supported at two support plates 21 secured to the base plate 2.
  • the bolts 20 form the pivot axis for the first tubular element 1.
  • Two holes 22 are machined at the base plate 2, these holes 22 serving to receive suitable attachment elements for anchoring the base plate 2.
  • each of these guide elements 23, 24 and 25 possesses an axially parallel plate-shaped arm 26 which is connected with the tubular element l, and at the upper end of which there is mounted the associated hollow cylindrical threaded bushing or sleeve 27, in which there is threaded a respective screw 28, preferably formed of plastic.
  • These screws 28 serve on the one hand as guides for the tubular element 5 and on the other hand as stop or impact means against which abuts a ring flange 29 mounted at the tubular element 5, so that there is realized a limitation in the axial movement of the tubular element 5 in upward direction.
  • the bracing cables 3 are secured to the arms 26.
  • a deflectable stop means for instance in the form of a pawl 30 or equivalent consisting of two parallel plates 3011 which receive therebetween the associated arm 26.
  • the bolt 31 forming the axis of rotation of the pawl 30 is not arranged at the center of gravity of such pawl or latch 30, rather offset with respect thereto, as shown in FIGS. 3 and 4, so that the pawl 30 under the action of gravitational force, and as particularly well shown in FIG. 4, drops downwards by means of its end 30c facing away from the tubular element 5.
  • Both of the plates 30b of the pawl 30 are interconnected by means of a connection element 32 which extends parallel to the bolt 31.
  • connection element 32 will be understood to protrude at both ends past the plates 30a and as best seen by referring to FIG. 3 serves for securing a ring element 33 defining a removable clamping element and formed of a plastic material, for instance rubber.
  • This ring element 33 extends from one end of the connection element 32 behind and past the arm 26 to the other end of the connection element. Ring element 33 prevents any tilting of the pawl or latch 30 and retains such in its locking or racheting position in which the ring flange 29 defining a cam element and mounted at the tubular element 5 comes to bear against the pawl 30, so that the tubular element 5 is fixedly retained in its desired terminal position. In the locked position the connection element 32 bears against the arm 26 and prevents the pawl 30 from being pushed into the tubular element 5.
  • the line or cable 15 previously considered already with regard to FIG. 2, and which is secured to the adjusting or alignment lever 14, connects the ring element 33 provided at the holder mechanism 4 as well as the ring elements 33 analogously provided at the holder mechanisms 10 and I1 and serves the purpose of pulling down or removing such ring elements 33 in the finished mounted position of the mast.
  • the second tubular element 5 At the lower end of the second tubular element 5 there are mounted three metallic rings 34 with intermediate spaces, wherein there are embedded in such intermediate spaces sealing elements 35 in the form of sealing 0- rings.
  • the metallic rings 34 and the sealing elements 35 serve to guide the tubular element 5 within the tubular element 1 and also as seals for the pressurized medium serving to extend the mast M and together with the circular-ring.
  • shaped cross-sectional surface 5a of the tubular element 5 as a piston surface.
  • tubular element 5 Beneath the ring or ring flange 29 there are secured to the tubular element 5 analogous metallic rings 36 and a sealing ring 37 which carry out guiding and sealing functions.
  • the tubular element 7 mounted as the last telescopically extensible tubular element is appropriately closed at its lower end in order to prevent further throughpassage of such pressurized medium.
  • the base plate 2 is initially anchored to the ground or floor and the first tubular element 1 into which there are inserted all the remaining tubular elements 5, 6 and 7 and the withdrawal tube 8, is secured by means of the bolts 20 to the base plate 2, whereby the assembly or unit with the tubular elements is tilted over and laid down at the ground or floor.
  • the withdrawal tube 8 is withdrawn to such an extent as is necessary for the desired height of the sighting mechanism 9 above the ground and thereafter is locked in place by means of the fixing mechanism 13.
  • all of the pawls 30 are provided with a ring element 33 clamped about the arm 26, which ring element holds the locking pawl in its locked or racheted position.
  • the thus mounted ring elements 33 are connected with one another by means of the cable which is secured at one end to the adjusting or alignment lever 14.
  • the tubular unit or package is collectively erected and by means of the bracing or spanning cables 3 mounted at the guide elements 23, 24, 25 of the first tubular element 1 clamped in a vertical position.
  • a source of pressurized medium such as air for instance.
  • a foot pump can be employed by way of example as a suitable source of such compressed air.
  • the pressurized medium which is pumped into the interior of the tubular element 1 fills the inner compartment formed by the tubular elements 1, 5 and 6 and begins to act upon the metallic rings 34 serving as piston surfaces and the cross-sectional surface of the extensible tubular elements 5, 6 and 7.
  • the tubes 5, 6 and 7 are upwardly displaced in a random sequence.
  • the tubular elements 5, 6 and 7 travel by means of their ring flanges 29 upon the contact surfaces 30a of the pawls retained in their locked position by the ring element 33, so that the pawls 30 are pushed or tilted back and traveled over by the ring flanges 29.
  • the pawls 30 are again placed back into their locked or racheting position by means of the elastic ring element As soon as the ring flanges 29 impact against the movement limiting screws 28, then the tubular elements have reached their uppermost position.
  • the tubular elements 5, 6 and 7 are lowered to such an extent until they bear by means of their n'ng flanges 29 upon the associated pawl 30 and thus are fixedly held in their position.
  • Contact of the ring flange 29 upon the pawl 30 brings about a locking action against rotation of the relevant tubular section (FIG. 3). Now after shutting-off the inlet valve 17 the source of pressurized medium can be removed.
  • the ring elements 33 are torn away by pulling upon the line or cable 15, so that the pawls 30 no longer can unlock owing to the weight of the tubular elements bearing thereagainst.
  • the extensible length of the telescopic mast can be changed in that in certain cases predetermined tubular elements are not extended. This can be realized by appropriately coupling the ends of two or more tubular elements in their retracted position.
  • the elastic rubber element 33 which retains the associated pawl or latch 30 in its racheted or locked position, must, as described, be removed prior to dismantling of the mast, in order to permit retraction of the tubular element.
  • a rubber ring which, as already described, can be torn away, it is also conceivable to use a ring element which consists partially or entirely of an elastic material, which after a brief time under the influence of weather effects disintegrates or decomposes, so that the ring element is destructed.
  • a ring element which essentially consists of a non-decomposing elastic mate rial, a partial member of a decomposing material which however need not be elastic.
  • the ring element formed of a non-decomposing material is subdivided and at the separation location is adhesively bonded together again by means of an adhesive.
  • the adhesive in such case then must lose its bonding properties under the effects of weather, yet should retain the ring element together such that it does not already fall apart during mounting.
  • the described mast can be effortlessly erected by two men and also again dismantled. Since the tubular elements are fixedly retained in their extended terminal position by the mechanical holder mechanisms, the pressurized medium must only serve for extending the tubular elements. Not as great sealing requirements need be placed upon the seals between the individual movable tubular elements as would be the case if the pressurized medium also were employed for fixedly retaining the tubular elements in their desired terminal position.
  • a telescopic mast assembly comprising, in combination, a plurality of tubular members mounted together to be telescopically movable relative to each other, said members being slidably interfitted in fluid tight engagement to enable said mast to be telescopically extended by introduction therein of a pressurized fluid medium, means for controllably introducing and exhausting said fluid medium from within said mast assembly, and latching means for releasably holding said mast in a telescopically extended position for permitting retraction of said mast by first introducing therein and subsequently exhausting therefrom said fluid medium, said latching means including an abutment memberv affixed to each of said tubular members, a latch member pivotally mounted to each of said tubular members at a location to operatively engage the abutment memberaffixed to an adjacent tubular member and a resilient clamping element removably engaging said latch member to hold said latch member in a first pivotal position to engage said abutment member, thereby to prevent relative movement of adjacent tub

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Earth Drilling (AREA)
US00275879A 1971-08-13 1972-07-27 Telescopic mast Expired - Lifetime US3818657A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1192771A CH523412A (de) 1971-08-13 1971-08-13 Teleskopmast und Verwendung desselben als Baugespannturm

Publications (1)

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US3818657A true US3818657A (en) 1974-06-25

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US00275879A Expired - Lifetime US3818657A (en) 1971-08-13 1972-07-27 Telescopic mast

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US (1) US3818657A (de)
CH (1) CH523412A (de)
DE (1) DE2233342A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100229473A1 (en) * 2009-03-11 2010-09-16 Thomas Industrial Rolls, Inc. Pneumatic Tower Design

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422792A1 (fr) * 1978-04-14 1979-11-09 Icpp Pylone auto-elevateur mobile

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007480A (en) * 1934-06-20 1935-07-09 Gustav A Schernekau Builder's scaffold
US2708493A (en) * 1949-07-23 1955-05-17 Thomas Mold & Die Co Portable antenna mast
US2739673A (en) * 1952-05-26 1956-03-27 Everett J Foster Aerial masts
US2983342A (en) * 1957-09-10 1961-05-09 Walter C Howard Telescopic mast
US3236343A (en) * 1963-12-18 1966-02-22 Levy Morris Safety fire device
US3267625A (en) * 1963-05-16 1966-08-23 Collins Radio Co Latching mechanism for an extensible antenna
US3346281A (en) * 1965-01-29 1967-10-10 Washington Iron Works Lock mechanism for telescoping spar
US3361456A (en) * 1965-04-12 1968-01-02 Richier Sa Automatic locking system for telescopic towers
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007480A (en) * 1934-06-20 1935-07-09 Gustav A Schernekau Builder's scaffold
US2708493A (en) * 1949-07-23 1955-05-17 Thomas Mold & Die Co Portable antenna mast
US2739673A (en) * 1952-05-26 1956-03-27 Everett J Foster Aerial masts
US2983342A (en) * 1957-09-10 1961-05-09 Walter C Howard Telescopic mast
US3267625A (en) * 1963-05-16 1966-08-23 Collins Radio Co Latching mechanism for an extensible antenna
US3236343A (en) * 1963-12-18 1966-02-22 Levy Morris Safety fire device
US3346281A (en) * 1965-01-29 1967-10-10 Washington Iron Works Lock mechanism for telescoping spar
US3361456A (en) * 1965-04-12 1968-01-02 Richier Sa Automatic locking system for telescopic towers
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100229473A1 (en) * 2009-03-11 2010-09-16 Thomas Industrial Rolls, Inc. Pneumatic Tower Design

Also Published As

Publication number Publication date
DE2233342A1 (de) 1973-02-22
CH523412A (de) 1972-05-31

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