Conveyors: power-driven – With means to facilitate working – treating – or inspecting... – Means to convey a palleted load back and forth between an...
Patent
1986-07-15
1988-04-26
Spar, Robert J.
Conveyors: power-driven
With means to facilitate working, treating, or inspecting...
Means to convey a palleted load back and forth between an...
1983462, 254104, B65G 4700
Patent
active
047398710
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for lifting work pieces or work piece supports from a conveyor belt. In a known device of this type support faces are formed on a slide, where the counter faces are formed on a lift table. The counter faces are flat wedge surfaces, by means of which the lift table supports on the slide and thereby on the foundation. The known arrangement is disadvantageous in that the slide must travel a relatively large path for obtaining a certain lift, or additional means must be provided in the two end positions of the slide for arresting the slide. Moreover, the forces for moving the slide are relatively large due to the sliding friction. Furthermore, the lift faces and the counter faces are subjected to severe stress because the operating pressure is transmitted by these faces.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved lifting device for lifting work pieces from a belt conveyor. The inventive device is advantageous because of a favorable relationship of the lift to the adjustment movement of the slide, whereby only a rolling friction is generated, so that also a lower drive output for the slide is required. The lift rollers are relieved from the support pressure in the operating position of the lift table and the two end positions of the slide do not have to be exactly defined, so that special means are eliminated.
A particularly friction poor drive is obtained if the support faces are designed so that during the movement of the slide into the second end position the lift table is at first lifted beyond its operating position and can then be lowered to the support faces of the slide which in the meantime have moved below the support faces of the lift table.
For forming the support faces it is suggested to use cylinder elements which preferably are connected with the supporting parts of those cylinders. A prelift element of a smaller diameter may be provided in an advantageous manner in front of the cylinder elements at the face opposite to the counter face. The cylinder elements may be made from inexpensive and very accurately-sized parts without an additional treatment of the support faces and may be mounted in a simple manner on the supporting part. The prelift element facilitates the start of the lifting and may also be used for generating a defined prelift, if such a prelift is desired in one of the structural parts.
It is particularly advantageous if the support faces are provided between the slide and the lift table as well as between the slide and the foundation. In this case the slide also performs a lift movement which adds to the relative lift movement of the lift table with respect to the slide. Thus, the lifting of the support faces or the adjustment path of the slide can be correspondingly reduced.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a plan view of a work station on a conveyor belt; and
FIGS. 2 and 4 illustrate a side view of the inventive device, partially in a section, in three different positions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A conveyor 10 has two conveyor belts 12 and 14 on which work piece supports 16 are mounted and are taken along by means of friction contact. An abutment 20 is provided for stopping the work piece supports 16 at a work station 18 which is introduceable into the path of movement of the work piece supports 16. Furthermore, a lift device 22 in accordance with the invention is provided on the work station 18 between the conveyor belts 12, 14. This device 22 is used to lift off the work piece supports 16, which are arrested by abutm
REFERENCES:
patent: 1347778 (1920-07-01), Hanson
patent: 1499560 (1924-07-01), Stangeland
patent: 3543903 (1970-12-01), Lodige
patent: 4148400 (1979-04-01), Cross
patent: 4600095 (1986-07-01), Brems et al.
Bonk Klaus
Maier Gernot
Dayoan D. Glenn
Robert & Bosch GmbH
Spar Robert J.
Striker Michael J.
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