Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1993-03-19
1995-01-31
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Elements
74528, 745016, 74527, G05G 104, G05G 506
Patent
active
053855973
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a safety device for the drive unit of a vibration roller that has a switch lever for manually operation the drive unit, whereby the drive unit is forcibly switched off when a locking bar is in its switch-off position, from which it can be moved by an operator for operating and driving the roller against a permanent return force into a release position.
Safety devices of this kind are known from German Patent 34 42 083 C2.
In the known safety devices the blocking device in a first embodiment is comprised of a locking pawl that connects the coupling device with the control element and the switch lever in a form-fitting manner to a stationary housing as soon as it is moved into the locked engaged position with the locking bar by the operator. In a second embodiment the blocking device is comprised of a Hirth toothing one part of which is fixedly connected with the coupling device and the other part is fixedly connected to the housing whereby both parts, after displacement of the coupling device with the locking bar by the operator into the locked engaged position, come into contact.
When employing the first mentioned, constructively especially simple embodiment, the operator must pay close attention that, on the one hand, the normal engaged position of the coupling and not the disengaged position is adjusted when changes at the drive unit are performed. These difficulties are prevented with the aforementioned second embodiment having a blocking device with a Hirth toothing because the operator can move the switch lever in the engaged position of the coupling with a somewhat increased force expenditure when he slightly releases the force with which he supports the locking bar in its release position. The second embodiment however has the disadvantage that it requires an increased constructive expenditure and allows only a stepwise change at the drive unit.
It is an object of the invention to provide a safety device according to the preamble of claim 1 which is characterized by a simple construction as well as by the possibility of a continuous change of the drive unit.
SUMMARY OF THE INVENTION
The safety device of the present invention is primarily characterized by the following features: comprising a first means for biasing the locking bar into its switch-off position and having an abutment for defining the locking position, the locking bar displaceable from the switch-off position into the locking position for operating the drive unit; being forcibly switched off when the locking bar is in its switch-off position; actuated by the switch lever, the control element having a second means for biasing the control element into a zero position in which zero position the drive unit is inoperative; connected to the control element and the drive unit; lever, the coupling comprising a spring biasing the coupling into a disengaged position in which disengaged position the switch lever is freely movable and disengaged from the control element, and the coupling being switchable consecutively from the disengaged position into an engaged position for operatively connecting the switch lever and the control element and further into a locked engaged position with the locking bar, during movement from the switch-off position to the locking position of the locking bar; and the first disk connected to the switch lever in the locked engaged position and rotatable with the switch lever, and a second disk connected to the locking bar having an end face with an elastomer coating oppositely arranged to the end face having teeth, wherein in the locked engaged position of the coupling the control element and the switch lever are blocked at least against displacement by the second means for biasing and the spring by the blocking device. locking bar has a handle portion extending parallel to a guide bracket of the guiding center pole, the handle portion spaced from the guide bracket in the switch-off position and the locking position. exerted for supporting the locking bar in its re
REFERENCES:
patent: 2670824 (1954-03-01), Banker
patent: 3525272 (1970-08-01), Olson
patent: 4949591 (1990-08-01), Roelle
patent: 4949830 (1990-08-01), Kemner et al.
patent: 5000059 (1991-03-01), Barnard
patent: 5214980 (1993-06-01), Saeda et al.
patent: 5235869 (1993-08-01), Nyezdatny
Luong Vinh T.
Wacker-Werke GmbH & Co KG
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