Mobile machine with supporting legs
The invention relates to a mobile work machine, particularly a concrete pump truck. The work machine comprises a chassis ( 10 ) that has at least four wheels ( 11 ) that belong to a wheel axle, in pairs. Furthermore, at least two support legs ( 20 ) disposed laterally on the chassis, in pairs, are provided, which legs have a telescope segment configured as an extension tube ( 28 ) articulated onto the chassis ( 10 ), and a foot part ( 24 ) that can be extended downward, in telescope-like manner, and supported on the ground, preferably by hydraulic means. In order to guarantee simple handling of the support mechanism, it is proposed, according to the invention, that the extension tube ( 28 ) of the support legs ( 20 ) is configured in the manner of a two-arm lever, forming a lower lever arm ( 40 ), with reference to the pivot axis ( 34 ), which contains the foot part ( 24 ), and an upper lever arm ( 42 ), preferably spring-supported in the pivoting-out direction.
1. Mobile work machine having a chassis ( 10 ), having at least two support legs ( 20 ) disposed laterally on the chassis, in pairs, which legs have an extension tube ( 28 ) articulated onto a location on the chassis, and a foot part ( 24 ) that can be extended downward, in telescope-like manner, and supported on the ground, whereby the extension tube ( 28 ) is configured in the manner of a two-arm lever, forming a lower lever arm ( 40 ), with reference to the pivot axis ( 34 ), which contains the foot part ( 24 ), and an upper lever arm ( 42 ), wherein the upper lever arm ( 42 ) engages into a guide link ( 54 ) in the region of a free end of the upper lever arm ( 42 ), an end of the guide link ( 54 ) forming an end stop ( 56 ),
wherein a pressure spring preferably configured as a gas pressure spring ( 58 ) engages onto the extension tube ( 28 ) of the support leg ( 20 ) in a region of the upper lever arm ( 42 ), and
wherein the support leg ( 20 ) overcomes a dead point of the pressure spring ( 58 ) on a pivot path of the support leg between the folded-in and the folded-out end position.
2. Work machine according to claim 1 , wherein the pivot axis ( 34 ) is oriented at a slant to the longitudinal chassis axis.
3. Work machine according to claim 1 , wherein the pivot axes ( 34 ) of the front support legs ( 20 ) converge in the travel direction of the chassis, so that the front support legs point forward at a slant in the pivoted-out state.
4. Work machine according to claim 1 , wherein the support leg ( 20 ) is spring-supported in the pivoting-out direction.
5. Work machine according to claim 1 , wherein the support leg ( 20 ) is biased against a stop or a catch position under the effect of the pressure spring, both in the folded-in and in the folded-out end position.
6. Work machine according to claim 1 , wherein the lower lever arm ( 40 ) of the extension tube ( 28 ) is longer than the upper lever arm ( 42 ).
7. Work machine according to claim 1 , wherein the end stop ( 56 ) is affixed to the chassis, and
wherein the upper lever arm ( 42 ) rests against the end stop in the region of the free end of the upper lever arm ( 42 ) in the pivoted-out state of the support leg ( 20 ).
8. Work machine according to claim 1 , wherein the pivot angle of the support legs ( 20 ) about the pivot axis ( 34 ) amounts to 20′ to 30′.
9. Work machine according to claim 8 , wherein the foot part ( 24 ) carries a rigid foot plate ( 25 ), which is inclined by an angle that corresponds to the pivot angle, relative to the extension direction of the foot part.
10. Work machine according to claim 1 , wherein the foot part ( 24 ) carries a foot plate ( 25 ) that can pivot in limited manner, by way of a foot joint.
11. Work machine according to claim 1 , wherein a handle ( 38 ) that points in the pivoting-out direction is disposed on the outside of the extension tube.
12. Work machine according to claim 1 , wherein the support leg ( 20 ) can be locked in place relative to the chassis, by means of a preferably manually activated locking mechanism, both in the folded-in and in the folded-out position.