Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1992-12-30
1994-08-09
Kramer, Dean J.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294907, 901 37, 901 47, B25J 1300
Patent
active
053359550
DESCRIPTION:
BRIEF SUMMARY
The object of this invention is a method and system for setting the hydraulic pressure influencing a hydraulic grab member, in particular roll jaws, by using control members.
In various kinds of equipment handling single pieces, such as also in more extensive systems handling pieces, various kinds of operations are carried out, in which the force acting as a pressure on a piece is adjusted by controlling the hydraulic pressure influencing the hydraulic cylinder of the grab member. One example of equipment handling these kinds of pieces is a truck equipped with roll jaws or other appropriate grab member used in handling rolls of paper.
In present methods, the hydraulic pressure influencing the grab member is selected manually. The person driving the device handling the piece must, on the basis of the information that he has received, select what is to his mind an appropriate hydraulic pressure, which is directed to influence the grab member, and thus also the mechanical compressive force directed on the piece corresponding to the hydraulic pressure.
In this kind of system, which is based on manual pressure selection, the problem is precisely the manual form of operation, when the person is the factor in the system due to which undesirable results occur. In a manual system, handling mistakes take place, due to indifference and forgetfulness, as a result of which the mechanical compressive force directed onto the piece is wrong, often being too great, when the piece is damaged due to too great pressure.
For example, the trucks in use handling rolls of paper damage them in such a way that they cannot be used in the printing presses of a newspaper publisher, for even a depression of five millimeters caused by excessive compression may cause the rejection of the roll.
The intention of this invention is to create a method that avoids the aforementioned defects, and which makes it possible to set the hydraulic pressure influencing the grab member in such a way that such a mechanical compressive pressure is directed onto the piece without damaging it.
This intention is achieved by means of the method in accordance with the invention, of which it is characteristic that in the method identifying information is read by a reading device from an identifier on the piece being handled and that a control device setting the hydraulic pressure influencing the grab member is controlled by the identifying information and thus it also sets the compressive force directed onto the piece.
The method in accordance with the invention is based on the idea that the correct mechanical compressive force, which is directed onto the piece being handled is set automatically on the basis of the information read from the identifier on the piece.
By means of this method the possibility of the human error factor is removed, as in this method the setting of the maximum value is based on the information contained in the identifier, and not on a human choice.
It is further also possible to remove the errors in handling caused by human forgetfulness. Considerable economic savings can be achieved through the reduction of damage to the pieces being handled.
The object of the invention is also a system for setting the hydraulic pressure influencing a hydraulic grab member, which system consists of an adjustment member. It is characteristic of the system in question that a control unit is connected to the adjustment device, the control unit being connected to a reading device, which reads the identifier on the piece being handled, which either directly or indirectly states the pressure which may be directed onto the piece by the grab member. Generally the operating device used is a hydraulic cylinder, the greatest operating pressure of which is controlled according to the identifier information.
By means of a system of this kind it is possible to implement the constructions required by the pressure setting method and thus achieve the advantages offered by the method with an appropriately compact construction, one significant advantage of the construct
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Pekka Kolari
Vesa Kahonen
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