DE2350701C2 - Boom for cranes - Google Patents

Description

Girdle or lower chord reach under ^a5 n ^ Vrfindune is based on the task of the

2. Boom according to claim 1, characterized in that J * ^r 5 ™ ^dun 8 type designated as above

Draws that in the cranked corner the crane boom is _{easier to clamp and the} upper chord (5) and the lower chord (6) are lower. £ ^ £. S _ne flawless weld ends of the legs (U) e.ne nnnenform.ge Vert.e- ^^ eHB. _{is provided and thus a high} durability (12), st. 3 "^ ™ ¹ ™ ^ ,, ^ of _the boom as they are in port

normal operation becomes possible.

According to the invention this is achieved in that

each side wall of the boom of two profile pieces

35 ken is formed, which connect with one another at their -

nen profile long sides to the inside of the box cross-section directed flanges and on these flanges opposite groove-like recesses have, in which a fitting piece is used as an extension 40, and whose with the upper belt or lower tied P-jgjK ^ SS ^^ tT

40 input

The invention relates to a boom for tergurt connected

Cranes, especially luffing cranes with box transverse box q ^ rschn.ttes ger ^

hi bhd Lihttllprofilen the an we.sen their fj ™ ** ™haben ^ ^fre ' ^e

Cranes, especially luffing cranes with q ^

cut, consisting of light metal profiles that are attached to the outside

the long sides of the profile by welding seams with each other

who are connected. During the development always 45 Through ^this “f. ^ WeS

Lighter cranes with the highest possible lifting capacity can be used by the extrusion profiles

through the use of light metal for a First of all, to & hwiten the deaths

zelne components of the crane, in particular for removing wall halves with the ^"over f ^ _n ^ _n ^ 2 _it ve oannt

casual, considerable weight savings are achieved, the longitudinal edges are clamped against each other without widening

the. When using light metal for the- 50 will be. To connect the thereby obtained

like supporting structures, the continuously extreme loading in cross-section U-shaped halves then serves

loads L are set, the choice of material is in the slot type.gen / ^ "" ^ «^ ΓΜίΐ

solid light metal and the related piece. This adapter holds the two profiles in place

Constructive design with a view to permanent one level so that during the Schwe.ßv ^ ganges

Welded connections are particularly important. 55 a deviation is impossible and the welded joint

It is well known that crane booms were designed “?!” ^ ™ ^ _β ^ή : ΓίίΓ £ ϊ1η _Β

Made of light metal These brackets were ever made.

LTh according to the TbSen, in steel construction ^ applied corner of the ! ^ - ^ r ^V «^ ™» g £ ^

Construction and manufacturing process produced, Schenkel guarantees safe welding

that is, several shots were laid out at the root seam, which in the highly stressed

composed, which were made of sheet metal, to nen is particularly important

then by transverse seams to form a whole. The invention; s in the drawing in the form of a

to be welded. In this type of construction tre- exemplary embodiment shown

However, due to the material used, Fig. I shows the view of the boom! as ka-

Difficulties in the production, the un- 6 ₅ th cross-section in octagonal shape, on the em above

gSig is screwed onto the strength and the service life of the roller head 1. At the boom foot

Structural effect, because two bearings 4 are screwed into the light metal

SchSzone in the structure is changed, which is just Fig. II shows a cross section through the design

ger2. The boom is made from individual extruded profiles composed, namely of the side walls, the upper chord 5 and the lower chord 6.

Fig. III shows in detail A the connection of the longitudinal edges of the two profile pieces forming the side wall 5 α, 5 b, which is connected by an inserted fitting piece? Which produces the hold required for welding.

IV shows in detail B the connection of the longitudinal edges between the profile pieces 5 a, Sb forming the side walls with the upper flange S or lower flange 6.

1 sheet of drawings

Claims (1)

1 is particularly critical in the case of a weld seam running over the entire cross section. Furthermore, the development of boom patent claims: straneoreß profiles for fire fighting vehicles is known (dSpS 2302931). These extruded profiles η on their long sides and recesses 1. Jibs for cranes - especially luffing - ^ ^eise "_fd; _{e as} weld seam preparation and cranes - with box cross-section, consisting of ^""S? ¹ ? * Aufiaee serve, whereby a flow through light metal profiles, which are on the profile long sides gensei"# * * _{is prevented} . Since the ^ ™ * Ψ extruded profiles are connected there by weld seams _{, there is a particular} difficulty with the profile pieces bevels for the xo to u-oraig Weld seams and the seam root reaching under the ^ " _{u en} ⁶ _and recesses at the same time on extensions, thereby marked, '& _the U-profiles to fit one another. Z et calibration η, that each side wall of the boom two long * _{erforderljche} dimensional accuracy is at two profile pieces (5 a, 5 b) is formed, the ^se ";, ~ \" JL _Erque rschniiten difficult n to achieve "its, 15 connected to each other Profillangssei- coarse λ η ^ jj _{US-fitting the} Länaskanten gen to the interior of KastenquerschniUes ctien addressed. urr ^l J_ _{sjnd bej the} known building lete flanges (8, 9) and these flanges mono- ^ ^{8 "0} ^ technical devices-requiring opposite groove-like cutouts as" JWN ^ _proper welding have only under conditions (10) into which a Paßstuck (7) as hch, wodJjJ is _ährleistet. In contrast is used for extension, and which with the upper _M hohem1 AUiwd g _eanspruchlen supporting structure