Joints and connections – Manually releaseable latch type – Having operating mechanism
Patent
1994-07-07
1995-11-28
Arola, Dave W.
Joints and connections
Manually releaseable latch type
Having operating mechanism
248409, 2807661, 292169, 29234115, 403321, B66C 500, E05C 112
Patent
active
054701678
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a locking device for supports that are arranged on an undercarriage or supporting frame and that can be laterally pulled out, swung out or telescoped from a retracted transport position into an extended support position, in particular for supporting legs on mobile machines such as concrete pumps or lift devices.
BACKGROUND OF THE INVENTION
Mobile machines having crane or distribution mast superstructures are supported on the ground in their operating position customarily with supporting legs that can be laterally extended or swung out (EP-A-357 988). It is important in this regard that the supports, which can be extended for instance by hydraulic motors, are effectively and reliably locked by means of the locking device both in their internal transport position and in their supporting position.
OBJECT AND SUMMARY OF THE INVENTION
It is the object of the present invention to provide a locking device of the type mentioned above that assures with simple means that the supports are automatically locked both in their transport position and in their supporting position and which device need only be actuated for unlocking.
To achieve this objective, the following combination of features is proposed according to the invention: frame transverse to the pull-out direction of the support between a locking position, an unlocking position, and a release position and which is pretensioned in the direction of the locking position under the action of a spring; the sleeve between two end positions, and that rests against a driver arranged on the locking bolt and acts on the former for displacement of the locking bolt between the locking position and the unlocking position; pull-out part of the support and that has in each case one locking surface which, in the transport position and in the support position of the support, comes against the locking bolt in its locking position, as well as a lead cam that extends in the region between the two locking surfaces and that acts on the locking bolt and moves the latter between its unlocking position and its release position; The driver can be uncoupled in the release position from the actuating member, which is in its end position corresponding to the unlocking position, it being possible for the uncoupled actuating member to automatically move into its end position which corresponds to the locking position.
In accordance with the invention the locking device need be actuated upon the pulling-out of the supports only for unlocking, while the locking in the two end positions of the supports takes place automatically. Incorrect handling upon the retracting and extending of the supports due to the absence of locking is thereby excluded.
One advantageous embodiment of the invention provides that the actuating member has a link element that can preferably be swung by means of a lever, that the link element has two cam or engagement sections connected to each other by an actuating cam, the driver resting against said cam or engagement sections in the locking position and in the unlocking position of the locking bolt under the action of the spring and with the creation of a form-locked and/or force-locked holding or engagement connection and that the driver can be lifted off from the link element in the release position of the locking bolt while the link element can be swung back automatically into its locking position preferably under the action of gravity. The link element can for this purpose be preferably mounted eccentrically swingable around a horizontal shaft connected with the sleeve relative to its two cam or engagement sections which are preferably aligned vertical to each other while the lever points essentially vertically downward in its locking position and is aligned essentially horizontally in its unlocking position.
Another advantageous embodiment of the invention provides that the locking bolt protrudes on the side of the support beyond the guide sleeve and that the engagement surfaces of the engagement and gu
REFERENCES:
patent: 2595453 (1952-05-01), Gilmore
patent: 4243256 (1981-01-01), Frydrych
patent: 4530532 (1985-07-01), Fujiya
Benckert Hartmut
Schillinger Dieter
Arola Dave W.
Chop Andrea
Putzmeister-Werk Maschinenfabrik GmbH
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