EP0666387B1 - Höhenverstellbarer Gerüstbock - Google Patents

Höhenverstellbarer Gerüstbock Download PDF

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Publication number
EP0666387B1
EP0666387B1 EP95101316A EP95101316A EP0666387B1 EP 0666387 B1 EP0666387 B1 EP 0666387B1 EP 95101316 A EP95101316 A EP 95101316A EP 95101316 A EP95101316 A EP 95101316A EP 0666387 B1 EP0666387 B1 EP 0666387B1
Authority
EP
European Patent Office
Prior art keywords
trestle
height
sleeve
crank
extendable
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.)
Expired - Lifetime
Application number
EP95101316A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0666387A1 (de
Inventor
Wilhelm Müller
Siegmar Baum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mueller & Baum & Co KG GmbH
Original Assignee
Mueller & Baum & Co KG GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mueller & Baum & Co KG GmbH filed Critical Mueller & Baum & Co KG GmbH
Publication of EP0666387A1 publication Critical patent/EP0666387A1/de
Application granted granted Critical
Publication of EP0666387B1 publication Critical patent/EP0666387B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/18—Scaffolds primarily resting on the ground adjustable in height
    • E04G1/22—Scaffolds having a platform on an extensible substructure, e.g. of telescopic type or with lazy-tongs mechanism
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/28—Scaffolds primarily resting on the ground designed to provide support only at a low height
    • E04G1/32—Other free-standing supports, e.g. using trestles

Definitions

  • the present invention relates to a height-adjustable trestle with the features according to the preamble of claim 1.
  • Scaffolding trestles of this type are also known as crank scaffolding trestles and are used for work scaffolding, in particular in the construction sector, with a plurality of crank scaffolding trestles of this type arranged in parallel one behind the other receiving scaffolding planks for a working platform. The height of the work platform can then be changed by adjusting the height of the crank frame.
  • these crank stands have to withstand comparatively high loads of up to around 1500 kg.
  • a horizontal shaft is rotated for the height adjustment, on which a star wheel is seated, the teeth of which engage in a row of holes in each of a perforated square tube of the upper part of the scaffolding trestle.
  • a locking device in the form of a bolt or the like must first be released, the bolt being inserted through a row of holes.
  • a tiltable kickback protection is provided which engages in the star wheel and thus blocks it. The upper part of the crank bracket can only be lowered after this anti-kickback device has been released.
  • a height-adjustable trestle is known (US-A-1 647 432) in which the height-adjustable beam is divided into two vertical spindles is supported, the thread of which is received by an internal thread of a worm wheel.
  • the self-locking and synchronous drive takes place via a horizontal shaft with worms engaging in the worm gears. Since this type of gear connection is associated with a high reduction, the height adjustment of the trestle requires a relatively large amount of time.
  • the object of the invention is to be seen in designing a height-adjustable trestle of this type in such a way that it can be adjusted in less time than in the aforementioned prior art, while maintaining the required security by self-locking.
  • the spindle drive for the height adjustment of the upper part has a self-locking thread, so that the loaded upper part cannot move down by itself and lowering the loaded scaffolding trestle is only possible when the crank is actuated.
  • the gear means are chosen so that due to a favorable transmission ratio, even with the top part of the scaffold frame loaded to a maximum, a relatively rapid start-up or shutdown by hand is possible by means of the crank. If necessary, the hand crank drive can also be replaced by an electric motor drive.
  • both Spindle are coupled in terms of movement via an endless chain or the like, which runs over two sprockets each associated with a spindle, one of these sprockets by rotating the with the Crank connected drive wheel is also driven.
  • the crank can only be attached on one side.
  • the crank is preferably removable and comprises a sleeve to which the drive wheel is connected at the end and which can be plugged onto a mandrel, a tube or the like.
  • a locking device is provided, after which the crank can be removed.
  • a guide device for axially guiding the spindles during the height adjustment is preferably provided at the level of the drive wheel and / or in the lower region of the frame of the crank block.
  • Both the pinion, which meshes with the drive wheel and the sprocket, which are arranged one above the other, are preferably mounted on the outside on a rotatable sleeve and are fixedly connected to it, for example welded. It is essential according to the invention that both the sleeve and the sprocket rotate with the driven pinion, so that the movement is transmitted to the spindle passed through the sleeve and via the chain also to the spindle on the other side of the trestle.
  • the crank bracket consists of a frame with a lower part 10 with two feet 11 on each side, a lower horizontal cross strut 12, a vertical post 13 on each side and an upper horizontal cross member 14, which the two sides of the frame at the level of the crank connects with each other. (See Figures 1 and 2).
  • the crank bracket also has a height-adjustable upper part 15, consisting of an upper horizontal supporting beam 16, which absorbs the loads of the scaffold, and which rests on the vertical spindles 17 on both sides and to which pipe ends 18 are also arranged in a vertical arrangement at the ends .
  • the crank bracket according to the invention has a height adjustment device which can be actuated via the crank 19 and which comprises a self-locking thread in the area of the spindles 17 and thereby makes it possible for the loaded upper part 15 to stop even when the cranking activity is interrupted. This height adjustment device is explained in more detail below with reference to FIGS. 1, 3 and 4.
  • the crank 19 is in principle designed as a sleeve 20 which is horizontally removably attached to a mandrel 21 attached to the standpipe profile 13 of the lower part. After loosening a split pin 22 or the like, the sleeve 20 of the crank can be removed from the mandrel 21.
  • a vertically aligned drive wheel 23 is attached to the end of the sleeve 20. This drive wheel 23 meshes with a horizontally arranged pinion 24 which is fastened to the outside on a tubular sleeve 25, for example welded to it.
  • the crank with the drive wheel 23 rotates, the pinion 24 and the sleeve 25 also rotate.
  • a sprocket 26 is attached to the outside of the pinion 24 on this sleeve 25, which can also be welded to the sleeve 25, for example.
  • This sprocket 26 is a gearwheel over which a chain 27 runs horizontally, which runs over the entire width of the crank block in a cover 28 in the manner of a chain case.
  • This cover 28 is removable.
  • the course of the chain 27 can be seen from FIG.
  • a chain tensioner 29 is also provided for this chain. As can be seen, this chain 27 runs on the right over the sprocket 26 and on the left side of the crank block over a sprocket 30 of the same design. It is an endless revolving chain.
  • the tubular sleeve 25 is equipped with an internal thread which engages in the thread of the spindle 17.
  • This thread is a so-called rolling thread that is designed as a trapezoidal thread with a relatively large distance between the individual threads.
  • This rolling thread between the spindle 17 and sleeve 25 is self-locking. If the sleeve 25 is now rotated by actuating the crank 19, 20, this leads to a height adjustment of the spindle 17. This, in turn, brings about the height adjustment of the upper part 15 of the crank bracket.
  • the spindle 17 runs within the standpipe profile 13 of the frame of the lower part 10 of the crank block and ends at a distance from the floor below the cross strut 12.
  • a guide sleeve 31 is inserted for guiding the spindle 17, a bolt 32 also serving as an anti-rotation device for the spindle.
  • a further guide 33 for the spindle 17 is provided in the area below the sleeve 25, which is firmly connected to profile parts of the lower part 10 of the crank block. This prevents the spindle from vibrating.
  • the basically identical arrangement with spindle and sleeve is also provided on the opposite side of the crank bracket, but for safety reasons, among other things, the drive via the crank 19 is only possible on one side of the drawing on the right. Since the chain wheel 30 is also rotated on the opposite side via the chain 27, the sleeve also rotates there and the second spindle 17 (on the left in the drawing) is also moved upwards or downwards.
  • Suitable axial bearings 34 are provided for absorbing the axial load in the vertical direction and ensuring smooth running of the sleeve 25 with an internal thread under load (see FIG. 3).

Landscapes

  • Architecture (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Movable Scaffolding (AREA)
  • Seats For Vehicles (AREA)
  • Emergency Lowering Means (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Adornments (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Dowels (AREA)
  • Materials For Medical Uses (AREA)
  • Prostheses (AREA)
  • Bridges Or Land Bridges (AREA)
EP95101316A 1994-02-05 1995-02-01 Höhenverstellbarer Gerüstbock Expired - Lifetime EP0666387B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4403617 1994-02-05
DE4403617A DE4403617C2 (de) 1994-02-05 1994-02-05 Höhenverstellbarer Gerüstbock

Publications (2)

Publication Number Publication Date
EP0666387A1 EP0666387A1 (de) 1995-08-09
EP0666387B1 true EP0666387B1 (de) 1996-08-14

Family

ID=6509568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101316A Expired - Lifetime EP0666387B1 (de) 1994-02-05 1995-02-01 Höhenverstellbarer Gerüstbock

Country Status (6)

Country Link
EP (1) EP0666387B1 (cs)
AT (1) ATE141372T1 (cs)
CZ (1) CZ26295A3 (cs)
DE (2) DE4403617C2 (cs)
HU (1) HUT70602A (cs)
PL (1) PL307081A1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2354790B (en) * 1999-08-28 2004-02-11 Neil Ernest Allen A support for a scaffolding platform

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647432A (en) * 1926-03-03 1927-11-01 George D Butler Trestle
US2140617A (en) * 1937-06-15 1938-12-20 Castady Harry Adjustable scaffold
US4468904A (en) * 1983-04-14 1984-09-04 Malley James J O Multi-stage extendable tower
FR2607535B1 (fr) * 1986-11-28 1990-02-23 Trouillet Andre Echafaudage a plate-forme mobile
DE9012976U1 (de) * 1990-09-12 1991-10-17 Hymer-Leichtmetallbau, 7988 Wangen Höhen- und seitenverstellbarer Auflagebock
DE9115455U1 (de) * 1991-12-13 1992-02-20 Albert, Erich, 8752 Edelbach Höhenverstellbarer Gerüstbock für das Erstellen einer Arbeitsbühne

Also Published As

Publication number Publication date
HU9500342D0 (en) 1995-03-28
PL307081A1 (en) 1995-08-07
DE4403617A1 (de) 1995-08-10
CZ26295A3 (en) 1996-08-14
HUT70602A (en) 1995-10-30
ATE141372T1 (de) 1996-08-15
EP0666387A1 (de) 1995-08-09
DE59500008D1 (de) 1996-09-19
DE4403617C2 (de) 1996-03-14

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