WORKING SCAFFOLD

Abstract: A displaceable working scaffold with a vertically adjustable working platform and with legs arranged in pairs and each consisting of two parts movable relative to each other. One of the problems with known working scaffolds of this type is the mounting and dismounting procedures, which are difficult and time-consuming, and to a large extent this is due to the fact that the known scaffolds consist of a relatively great number of parts that must be joined and dismounted each time the known scaffolds are to be set up and taken down, respectively. I.a. to solve this it is suggested according to the present invention that a jack (16) is arranged between the upper and lower parts of the legs (10) in each pair of legs by means of which the working platform (3) is raised and lowered and that detachable staying means (23, 24) for staying the pair of legs are arranged between the working platform (3) and the upper portions (10a) of the legs, a hinge (11, 12) being provided for their connection to the working platform, around which the relative leg (10) can be turned towards the working platform (3) after at last partly loosening said connection.

Description: Working schaffold This invention relates to a working scaffold movable on a support and having a vertically adjustable working platform, and the object of the invention is to achieve a working scaffold provided with such a platform, which can be erected and dismounted in a simple and quick way and, in dismounted state, consists of few loose parts and is so compact that it can be introduced and used in rela¬ tively, small rooms without being disassembled, and is easily transportable, e.g. on an automobile trailer, and which, further, should be constituted so that it can be raised and lowered without changing and loosening any staying and so that it can straddle obstacles on the support at least in the upper positions of the working platform. This is achieved in such a way that the working scaffold according to the invention has been provided with the characteristic features set out in the claims. The invention is illustrated in the following with reference to the enclosed drawings, in which Fig. 1 and 2 show a lateral view and an end view, respectively, of a preferred embodiment of the present working schaffold and Fig. 3 shows a detail of a stay attachment on a larger schale. In the drawings 1 designates a frame 2 comprising the working platform, preferably of framework beams, and with transversal and/or diagonally arranged stays, not shown in detail in the drawings, for firm support of the standi and working planes of the platform, i.e. floor 3, and a rack 4 running all around and with vertical poles 5 and 5 upper and lower rods 6 connected with these, the parts 7 covering the ends- of the working platform of these being rotatably attached at one of their ends to one corner pol and detachably connected with the other. This rack is arranged as vertically adjustable with its vertical poles 10 in sleeves 8 provided with locking screws and attached at 2 and can after loosening of the locking screws of the sleeves be lifted away from the very platform when dis¬ assembling the working platform for its transfer to an¬ other working place. 15 The working platform is supported by legs 10 pro¬ vided with wheels 9, preferably pivot wheels, said legs 10 being arranged in pairs and each consisting of parts displaceable relative to each other, an upper portion 10a and a lower portion 10b. Of these parts the upper part 20 10a in the embodiment of the invention shown in the draw¬ ing is arranged as displaceable around the lower portion 10b and is at its lower end connected with the frame 2 of the working platform by means of at least two bolts or screws 11 containing a bolt or screw joint via a mounting 25 plate 12 in contact with the frame or a plate connected with this, which mounting plate is rididly connected to the upper part 10a. To permit different alternative po¬ sitions of attachment of the working platform relative to the legs 10 these can be provided with additional oun- 30 ting plates between the ends of the upper parts as shown at 12 in Fig. 1. The legs 10 in each pair are, moreover, reciprocall connected by means of a transverse beam 13 connecting the lower portions 10b of the leg pair with each other, which 35 beam should be located as close to the wheels 9 as possi¬ ble, and by one additional transverse beam 14 connecting the upper parts 10a of the leg pair with each other, which beam should be located at a certain distance from the low¬ er end 15 of the upper parts of the legs to form an inter¬ space between the beams 13 and 14 when the scaffold is in 5 its lowermost position, in which the upper parts 10a of the legs rest with their ends 15 against the beams 13. This interspace between the beams 13 and 14 at both end portions of the scaffold is arranged for a construc¬ tion jack 16, which is adapted to climb along a rod 17 at- 10 tached on the beam 13 between the legs 10 and extending through an aperture serving as guide in an overhead cross bar 14. By these two cross bars 14 the movable or verti¬ cally adjustable part of the working scaffold of the in¬ vention rests on the two construction jacks 15, which in 15 dependence of the fact, in which of the sockets 18 of the jacks the operating lever 19 is inserted, can be brought with the aid of this to climb up and down the rod 17 for raising and lowering the working platform 1 in a stepless way. For unloading the construction jacks 16 the parts of 20 each leg are reciprocally locked in a set working posi¬ tion by means of a security hook suspended in a line or a pin 30 provided with a similar locking and inserted in the holes of the lower part of the leg arranged at a suitable reciprocal distance, said holes corresponding 25 to a set working position. The ends 15 of the upper parts of the legs can then rest on the pins 20, but the upper parts 10a of the legs can also be provided with one or more through holes of the locking pins 20. The two pairs of legs, one of which is shown as 30 " attached in spaced relationship from one end of the work¬ ing platform to form a "balcony" 22, are moreover on each - ' ' - side of the rack reciprocally stayed by means of a tri¬ angular staying device. Each such staying device comprises ' • *' more specifically a horizontal stay 23 and two diagonal 35 stays 24, the upper ends of which are articulatedly at¬ tached by means of each their or a common locking pin 25 to a mounting plate 26 connected with the frame and the other ends of which are articulatedly attached to each their attaching means 27 together with one end of the horizontal stay. As is shown more in detail in Fig. 3 each such attaching device has a projection 28 directed upwards and downwards, which in an assembled position are inserted in each their yoke 29 arranged at the lower end portion of the upper part of the leg and which are retained in these yokes 29 without the possibility of coming loose as the stays 23 and 24 prevent in an ef¬ fective way displacement of the .attaching means 27 up¬ wards as well as downwards. , As the staying devices are connected with the upper portions 10a of the legs and the working platform, they will follow at raising and lowering thereof and will in lifted position permit the working scaffold to straddle obstacles on the support, which simplifies the work to a high degree, as no time need be wasted on eliminating possible obstacles on the support, which, on the other hand, is often the case at known working scaffolds car- ried on wheels. By its construction the present xvorking scaffold can also be erected and taken down very easily. For dis¬ mounting it is only necessary, after lowering the work- ing platform to the bottom position and loosening the rack, to draw out the pins 25.holding the upper ends of the diagonal stays 24, after which the staying means 27 can be removed by lifting the means of attachment 27, the downwardly directed projection 28 being free of its yoke 29, and to loosen all the bolts 11 except one in each bolt connection, after which the legs 10 can be turned towards the working platform 1. This can prefera¬ bly be done after turning the schaffold so to speak up¬ side down, e.g. on the trailer. Thus the rack dismounted. into t o parts as well as the staying devices and possib¬ ly ladders 30 can be laid in the frame 2 on the floor 3, O I after which the legs 10 are folded over these parts. The scaffold is in this disassembled state very compact and can therefore also be introduced into relatively narrow spaces, without it being necessary to dismantle it addi- tionally, and be raised there rapidly, which is made by swinging out the legs and fastening them by screws. After this the staying devices and the rake are placed in posi¬ tion and the scaffold is ready for use. This invention is not restricted to what has been described above and shown in the drawings but can be changed and modified in several different ways within the scope of the inventive thought set out in the claims. Thus the climbing rod 17 can be composed of several parts so that it is shortened and lengthened. OMPI

Claims: Patent Claims 1. A working schaffold comprising a vertically adjustable working platform and legs arranged in pairs, which each consist of two parts movable relative to each other, viz. an upper portion of the leg connected with the working platform and a lower portion of the leg pref¬ erably provided with wheels, characterized in that a jack is arranged between the upper and lower parts of the legs in each pair of legs for raising and lowering the working platform and that detachable staying means are arranged between the working platform and the upper parts of the legs for staying the pairs of legs, the connection there¬ of with the working platform, comprising a hinge, around which the respective leg can be turned towards the work- ing platform after at least partly loosening said connec¬ tion. 2. A schaffold as claimed in claim 1, characterize in that each jack consists of a- construction jack arrange • to climb a rod parallel to the legs, which rod is connect with a beam joining the lower parts of the legs in each pair of legs and which is controlled by a beam connecting the upper portions of the legs of said pair of legs, with which the construction jack cooperates for raising and lowering the working platform. 3. A scaffold as claimed in claim 1 or 2, charac¬ terized in that the connection between each upper portion of the legs and the working platform consists of a screw or bolt joint comprising at least two screws and bolts re spectively. 4. A scaffold as claimed in any one of the precedi claims, characterized in that each staying device is tri¬ angular and comprises two diagonal stays connected with the working platform and a stay is substantially parallel to the working platform and extends between the ends of the diagonal stays in spaced relationship-,from ea other, which stays are connected at each end with the end of the diagonal stay by a means of attachment, which is loosely attached to the upper part of the legs and is de¬ tachable from the upper portion of the legs after loos¬ ening of the end of the diagonal stay connected to the working platform. 5. A schaffold as claimed in claim 4, characterized in that each means of attachment comprises upwardly and downwardly directed projections, which are inserted in clamps arranged at the upper part of the legs at a dis- tance corresponding to the length of the projections. 6. A scaffold as claimed in any one of the preced¬ ing claims, comprising two pairs of legs, characterized in that one pair of legs is arranged in spaced relations- ship from one end of the working platform to form an over- hang or a balcony. 7. A schaffold as claimed in any one of the preced¬ ing claims, the working platform being provided with a rack consisting of poles and upper and lower rods connecting these reciprocally, characterized in that the poles are arranged as vertically adjusable in sleeves attached to the platform and provided with locking screws and can be lifted out of these, the upper and lower rods covering the end sides of the working platform being rotatably ar¬ ranged at one corner pole and loosely connected to the other corner pole. 8. A scaffold as claimed in any one of the preced¬ ing claims, characterized in that it is provided with sup¬ port legs, which can be folded out, to prevent upsetting, especially when using the scaffold outdoors. O PI

Inventors: KLINGSTEDT H, KLINGSTEDT I
Applicants: KLINGSTEDT H, KLINGSTEDT I, MILJOETAKMONTAGE AB
Application year: 1979
Main classification: E04G1
IPC codes: E04G1