EP0230403A1 - Elevating device for the mast sections of a sectional mast, especially a movable aerial mast of framework type - Google Patents
Elevating device for the mast sections of a sectional mast, especially a movable aerial mast of framework type Download PDFInfo
- Publication number
- EP0230403A1 EP0230403A1 EP87850011A EP87850011A EP0230403A1 EP 0230403 A1 EP0230403 A1 EP 0230403A1 EP 87850011 A EP87850011 A EP 87850011A EP 87850011 A EP87850011 A EP 87850011A EP 0230403 A1 EP0230403 A1 EP 0230403A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mast
- jacket
- sections
- transport screw
- section
- Prior art date
- 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.)
- Granted
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Classifications
-
- 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
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
Definitions
- the present invention refers to an elevating device for the mast sections of a sectional mast, especially a movable aerial mast of framework type and comprising a foot portion with a mast support and guide jacket, said elevating device including a power-operated screw mechanism.
- Movable aerial masts have to fill a plurality of partly contradictory requirements. Thus, they have to be strong and rigid but still relatively light and easily mountable and dismountable.
- Conventional mast structures usually are of framework type and the masts are put together from a number of sections. The mast is erected by arranging at a desired place a foot portion of the mast having a support and guide jacket therefor and introducing into said jacket the sections one by one, coupling them together with the nearest preceding section and raising them by means of any suitable raising and lowering mechanism a sufficient distance for allowing the introduction of the subsequent mast section into the jacket.
- the conventional raising and lowering mechanisms have been rope blocks or chain winches having a hook which is connected with the lower end of each mast section after the same has been inserted into the guide jacket after which raising is made, the mast is locked, the hook released and the raising and lowering mechanism returned to the initial position for again connecting the hook to the lower end of the subsequent mast section.
- an elongated transport screw extends vertically along one side of the guide jacket and approximately contacts externally with its periphery the peripheral contour of a mast section housed parallel therewith within the jacket and in that each mast section in its lower portion at the point of contact on the peripheral contour is provided with a mechanical component serving as a nut segment meshing with the threads of the transport screw.
- the transport screw certainly operates intermittently but permanently in the same direction during the erection of the mast and in the opposite direction during the lowering of said mast.
- the respective mast sections only need to be inserted into the support and guide jacket of the foot portion in order to be brought directly into meshing with the transport screw with its nut segment, after which the screw is rotated and the mast section together with the preceding sections is raised a distance substantially corresponding to the length of one section, after which the subsequent mast section is introduced into the guide jacket, coupled to the preceding mast section and thereafter raised by means of the transport screw in cooperation with the nut segment of the last-mentioned section.
- Fig 1 is a side elevational view of a mast with an elevating device according to the invention with a support and guide jacket in a foot portion of the mast and Fig 2 is a plan view from above of said guide jacket.
- a movable aerial mast of framework type comprises a foot portion 1 and a plurality of mutually equal mast sections 2 of framework type and in the present case having triangular cross section.
- the uppermost section carries in its upper end an aerial element such as a paraboloidal aerial 3.
- the sections 2 are provided with suitable mountings for some suitable kind of coupling means such as a bolt connection of easy-coupling type.
- the mast In its erected position the mast rests with its lowermost sections in a support and guide jacket 4 having an elevating device 5.
- the jacket has the same general cross sectional shape as the mast sections 2, in the present case thus triangular shape, and surrounds the lowermost mast sections 2 with moderate clearance.
- the height of the jacket substantially corresponds to the total length of two mast sections 2 and for stabilizing the mast the jacket 4 is provided with support legs 6 and side struts 7 protruding from the corners of the triangular cross section. From the top as well as from other levels of height of the mast, if desired, usually also extend span wires 8.
- the jacket which suitably also is of framework type, is provided in the lower portion of one of its sides with an opening 10 in said side wall.
- the mast sections 2 are guided by means of suitable guide members 11, preferably in the form of guide rollers cooperating with the corner edges of said mast sections 2.
- the elevating or raising and lowering mechanism 5 comprises an elongated vertical transport screw 12 which is along another side of the guide jacket 4 also provided with a suitable opening.
- the screw 12 has a length which at least corresponds to the length of each mast section 2 and extends from a bottom of the guide jacket 4 and upwardly to a position above the level of a mast section 2 standing on the bottom of the jacket 4 or, in other words above the open portion of the framework at the insertion and removal side of the jacket 4.
- the transport screw 12 is connected with some suitable kind of drive mechanism 13 not further illustrated, such as a worm drive driven by an electric motor for 12 or 24 volts.
- the device also is provided with a connection for mounting of a hand crank for allowing manual operation of the transport screw in case of lack of electric current.
- the transport screw 12 is arranged in a plane coinciding with the center line of the adjacent jacket side such that the screw with its periphery approximately contacts externally one of the sides of a mast section 2 located in the jacket 4 and oriented parallelly thereto along an axis extending in said side, said axis preferably being the longitudinal center line of said side.
- each mast section 2 according to the invention is provided at the lower end of said center line with a nut segment 14 adapted for meshing with the threads of said transport screw 12.
- the nut segment may be constituted by a slide block of suitable material such as bronze or by a roller.
- the mast provided with the elevating device according to the invention is erected in the following way. Firstly, the support and guide jacket 4 is arranged and levelled at the desired place and thereafter a first mast section 2 is inserted into the guide jacket 4 through the opening in one of the sides thereof, said section 2 of course being oriented in such a way that a side provided with a nut segment 14 is turned towards the side of the jacket 4 at which transport screw 12 is located. After that the rotation of the transport screw 12 is started and owing to the movement of the nut segment 14 along the threads of the screw 12 a raising of the mast section 2 through the jacket 4 is obtained. When the mast section 2 has been raised to such an extent that a subsequent mast section 2 can be inserted into the guide jacket 4, the rotation of the transport screw 12 is stopped.
- the subsequent mast section 2 which has been inserted into the jacket 4 is coupled with its upper end to the lower end of the preceding mast section 2 by means of a bolt connection of easy-coupling type not further illustrated, after which the rotation of the transport screw 12 again is started, now in the same direction as during the first transport movement and without any need of a return movement such as in rope blocks or other raising and lowering mechanisms previously used for the same purpose. This is repeated until all, in the present case 19, mast sections have been brought into position and been coupled to each other.
Abstract
Description
- The present invention refers to an elevating device for the mast sections of a sectional mast, especially a movable aerial mast of framework type and comprising a foot portion with a mast support and guide jacket, said elevating device including a power-operated screw mechanism.
- Movable aerial masts have to fill a plurality of partly contradictory requirements. Thus, they have to be strong and rigid but still relatively light and easily mountable and dismountable. Conventional mast structures usually are of framework type and the masts are put together from a number of sections. The mast is erected by arranging at a desired place a foot portion of the mast having a support and guide jacket therefor and introducing into said jacket the sections one by one, coupling them together with the nearest preceding section and raising them by means of any suitable raising and lowering mechanism a sufficient distance for allowing the introduction of the subsequent mast section into the jacket. For this purpose the conventional raising and lowering mechanisms have been rope blocks or chain winches having a hook which is connected with the lower end of each mast section after the same has been inserted into the guide jacket after which raising is made, the mast is locked, the hook released and the raising and lowering mechanism returned to the initial position for again connecting the hook to the lower end of the subsequent mast section. When lowering the mast and dismounting thereof, the operation of course is carried out in the same way although in reversed order.
- In another kind of mast design which has mutually telescopically movable sections it has also been suggested to utilize a centrally mounted transport screw for expansion and retraction of the mast.
- Conventional framework masts of the kind referred to above and put together in sections have turned out to serve their purpose rather well but at many occasions of use in which the time aspect is essential the conventional raising and lowering mechanism has been considered to operate too slow since it has to be returned to the initial position after each working movement. There is thus a need for a faster operating device for this purpose.
- Quite surprisingly it has now turned out that this can be achieved very easily by means of a differently designed screw mechanism which does not require any return movement between the working movements. The object of the present invention now is to suggest such a device and the invention is essentially characterized in that an elongated transport screw extends vertically along one side of the guide jacket and approximately contacts externally with its periphery the peripheral contour of a mast section housed parallel therewith within the jacket and in that each mast section in its lower portion at the point of contact on the peripheral contour is provided with a mechanical component serving as a nut segment meshing with the threads of the transport screw.
- Owing to said design, the transport screw certainly operates intermittently but permanently in the same direction during the erection of the mast and in the opposite direction during the lowering of said mast. The respective mast sections only need to be inserted into the support and guide jacket of the foot portion in order to be brought directly into meshing with the transport screw with its nut segment, after which the screw is rotated and the mast section together with the preceding sections is raised a distance substantially corresponding to the length of one section, after which the subsequent mast section is introduced into the guide jacket, coupled to the preceding mast section and thereafter raised by means of the transport screw in cooperation with the nut segment of the last-mentioned section.
- By way of example, the invention is further described below with reference to the accompanying drawing, in which Fig 1 is a side elevational view of a mast with an elevating device according to the invention with a support and guide jacket in a foot portion of the mast and Fig 2 is a plan view from above of said guide jacket.
- As is evident from the drawing a movable aerial mast of framework type comprises a foot portion 1 and a plurality of mutually
equal mast sections 2 of framework type and in the present case having triangular cross section. The uppermost section carries in its upper end an aerial element such as a paraboloidal aerial 3. At each end thesections 2 are provided with suitable mountings for some suitable kind of coupling means such as a bolt connection of easy-coupling type. In its erected position the mast rests with its lowermost sections in a support andguide jacket 4 having anelevating device 5. The jacket has the same general cross sectional shape as themast sections 2, in the present case thus triangular shape, and surrounds thelowermost mast sections 2 with moderate clearance. The height of the jacket substantially corresponds to the total length of twomast sections 2 and for stabilizing the mast thejacket 4 is provided withsupport legs 6 andside struts 7 protruding from the corners of the triangular cross section. From the top as well as from other levels of height of the mast, if desired, usually also extendspan wires 8. - In order to provide for the
individual mast sections 2 one by one into the support andguide jacket 4 when erecting the mast as well as for removal of said sections in the corresponding manner when dismounting the mast, the jacket which suitably also is of framework type, is provided in the lower portion of one of its sides with an opening 10 in said side wall. Within the guide jacket themast sections 2 are guided by means ofsuitable guide members 11, preferably in the form of guide rollers cooperating with the corner edges of saidmast sections 2. - According to the invention the elevating or raising and lowering
mechanism 5 comprises an elongatedvertical transport screw 12 which is along another side of theguide jacket 4 also provided with a suitable opening. Thescrew 12 has a length which at least corresponds to the length of eachmast section 2 and extends from a bottom of theguide jacket 4 and upwardly to a position above the level of amast section 2 standing on the bottom of thejacket 4 or, in other words above the open portion of the framework at the insertion and removal side of thejacket 4. At said position thetransport screw 12 is connected with some suitable kind ofdrive mechanism 13 not further illustrated, such as a worm drive driven by an electric motor for 12 or 24 volts. Suitably the device also is provided with a connection for mounting of a hand crank for allowing manual operation of the transport screw in case of lack of electric current. - According to the invention the
transport screw 12 is arranged in a plane coinciding with the center line of the adjacent jacket side such that the screw with its periphery approximately contacts externally one of the sides of amast section 2 located in thejacket 4 and oriented parallelly thereto along an axis extending in said side, said axis preferably being the longitudinal center line of said side. At least at one of its sides eachmast section 2 according to the invention is provided at the lower end of said center line with anut segment 14 adapted for meshing with the threads of saidtransport screw 12. The nut segment may be constituted by a slide block of suitable material such as bronze or by a roller. - The mast provided with the elevating device according to the invention is erected in the following way. Firstly, the support and
guide jacket 4 is arranged and levelled at the desired place and thereafter afirst mast section 2 is inserted into theguide jacket 4 through the opening in one of the sides thereof, saidsection 2 of course being oriented in such a way that a side provided with anut segment 14 is turned towards the side of thejacket 4 at whichtransport screw 12 is located. After that the rotation of thetransport screw 12 is started and owing to the movement of thenut segment 14 along the threads of the screw 12 a raising of themast section 2 through thejacket 4 is obtained. When themast section 2 has been raised to such an extent that asubsequent mast section 2 can be inserted into theguide jacket 4, the rotation of thetransport screw 12 is stopped. This can easily be provided by a limit switch for the electric drive motor or any similar manner obvious to the artisan. Thesubsequent mast section 2 which has been inserted into thejacket 4 is coupled with its upper end to the lower end of the precedingmast section 2 by means of a bolt connection of easy-coupling type not further illustrated, after which the rotation of thetransport screw 12 again is started, now in the same direction as during the first transport movement and without any need of a return movement such as in rope blocks or other raising and lowering mechanisms previously used for the same purpose. This is repeated until all, in the present case 19, mast sections have been brought into position and been coupled to each other. - When dismounting the mast the same operation is repeated although in reversed order. For locking at each occasion the
respective mast section 2 next to the lowermost one in theguide jacket 4 it is suitable that thetransport screw 12 or thescrew 12 together with thedrive mechanism 13 is of a self-braking type. Said locking also can be provided by locking means, not illustrated.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8600213A SE451376B (en) | 1986-01-17 | 1986-01-17 | HIGH AND SINGLE DEVICE FOR MASTER SECTIONS AT A SECTIONAL COMPOSITIVE MAST, SPECIFICALLY A REMOVABLE ANTENNMAST OF TRAINING TYPE |
SE8600213 | 1986-01-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0230403A1 true EP0230403A1 (en) | 1987-07-29 |
EP0230403B1 EP0230403B1 (en) | 1989-08-09 |
Family
ID=20363133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870850011 Expired EP0230403B1 (en) | 1986-01-17 | 1987-01-16 | Elevating device for the mast sections of a sectional mast, especially a movable aerial mast of framework type |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0230403B1 (en) |
DE (1) | DE3760412D1 (en) |
SE (1) | SE451376B (en) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE449601A (en) * | ||||
DE119095C (en) * | ||||
DE1066720B (en) * | 1959-10-08 | |||
GB901116A (en) * | 1960-02-12 | 1962-07-18 | Pingon Pierre Joseph | Self-erecting tower cranes |
FR1325120A (en) * | 1962-03-23 | 1963-04-26 | Extendable Support Mast Installation | |
US3213575A (en) * | 1961-09-19 | 1965-10-26 | Boczek Walter | Cranes |
FR1543012A (en) * | 1967-10-24 | 1968-10-18 | Device for transforming a rotary movement into a rectilinear translation, particularly for moving a load | |
FR1585396A (en) * | 1968-11-26 | 1970-01-16 | ||
AT292966B (en) * | 1966-10-12 | 1971-09-27 | Friedrich Freimueller | Lattice mast built from shots |
FR2247913A6 (en) * | 1971-07-22 | 1975-05-09 | Comabi | Elevator formed of scaffolding frames - has ladder elements enclosing vert. operating screws |
-
1986
- 1986-01-17 SE SE8600213A patent/SE451376B/en not_active IP Right Cessation
-
1987
- 1987-01-16 DE DE8787850011T patent/DE3760412D1/en not_active Expired
- 1987-01-16 EP EP19870850011 patent/EP0230403B1/en not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE449601A (en) * | ||||
DE119095C (en) * | ||||
DE1066720B (en) * | 1959-10-08 | |||
GB901116A (en) * | 1960-02-12 | 1962-07-18 | Pingon Pierre Joseph | Self-erecting tower cranes |
US3213575A (en) * | 1961-09-19 | 1965-10-26 | Boczek Walter | Cranes |
FR1325120A (en) * | 1962-03-23 | 1963-04-26 | Extendable Support Mast Installation | |
AT292966B (en) * | 1966-10-12 | 1971-09-27 | Friedrich Freimueller | Lattice mast built from shots |
FR1543012A (en) * | 1967-10-24 | 1968-10-18 | Device for transforming a rotary movement into a rectilinear translation, particularly for moving a load | |
FR1585396A (en) * | 1968-11-26 | 1970-01-16 | ||
FR2247913A6 (en) * | 1971-07-22 | 1975-05-09 | Comabi | Elevator formed of scaffolding frames - has ladder elements enclosing vert. operating screws |
Also Published As
Publication number | Publication date |
---|---|
SE451376B (en) | 1987-10-05 |
SE8600213D0 (en) | 1986-01-17 |
SE8600213L (en) | 1987-07-18 |
EP0230403B1 (en) | 1989-08-09 |
DE3760412D1 (en) | 1989-09-14 |
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