Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2000-03-01
2001-07-17
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
Reexamination Certificate
active
06262499
ABSTRACT:
This invention concerns a device for providing a linear movement according to the preamble of claim
1
.
Among such devices are previously known piston rod cylinders, which most outwardly on the piston rod comprises means for co-operation with a mechanical gripper, a suction gripper and the like. The prior art devices, however, suffer from a number of drawbacks, on the one hand based on the fact that conduits for leading signals and/or energy to the working tool typically hang loosely and are more or less freely moveable during the working stroke of the piston. These loose conduits are obvious sources of problems with the operation, since the conduits are easily hooked into or damaged by items in proximity to the equipment. Also acceleration forces from moving equipment may bring about damages to the loose conduits. Further, the known device needs a separate rotational guide in order to ensure that the piston, together with the associated working tool, does not rotate in operation, which results in a more complex and expensive device.
It is an aim of the invention to provide a device according to the above, wherein the drawbacks of the prior art are avoided.
This is achieved in such a device through the features of the characterising portion of claim
1
.
By the linear motor being of a kind including an axially moveable movement transferring means which extends radially from the motor and is connected to the rod means, it is achieved that the conduits for e.g. fluid, electricity and/or signal supply may be easily placed inside the channel of the rod means. The conduits may then be located entirely outside the linear motor itself. This results in simple placement of conduits as well as ensured safety against external damages on the conduits, whereby the reliability of the equipment to withstand running problems is increased. Further, guidance preventing rotation is easily obtained automatically by the movement transfer means, which is rotationally rigidly connected to the rod means, and which is guided so as to prevent rotation.
It is preferred that the linear motor is a rodless so called slot cylinder, since this in the simplest way ensures non-rotational effect by the construction of the slot cylinder. The motor also becomes compact and without any need of e.g. a rotational motor in case a screw
ut mechanism is used.
In order to ensure proper guidance of the rod means during its axial movement, a linear guide for guiding the rod means is provided, which supports the rod means between its ends and which is attached to the linear motor.
The invention enables a clean and logical assembly, since the supply conduits, for example air tubes and electrical sensor cables, are placed inside the rod means. In this way it is easy to arrange interfaces, on the one hand against a working tool and on the other hand against a possible control unit and power source.
By arranging the linear guide integral with one of the end walls of the inner motor, simplified manufacture and assembly of the device is achieved. In case of a slot cylinder, a cylinder end wall is hereby extending radially so as to include a bearing for passage of the rod means besides the conventional arrangement in a cylinder end wall, such as fluid channels, sealing seats, screw holes etc. The corresponding goes in case any another kind of a linear motor is used. This way a unit is provided, which is rational to manufacture, and where separate guiding arrangements may be avoided. This advantage is accentuated if the device according to the invention also includes a second end wall, which in a corresponding way is constructed to include seats for coupling means to signal and fluid connections. In that case this second end wall comprises said interface against a possible control unit and power source.
REFERENCES:
patent: 4394593 (1983-07-01), Gocho
patent: 5175456 (1992-12-01), Neff et al.
patent: 6057616 (2000-05-01), Pelstring
patent: 6075297 (2000-06-01), Izawa et al.
AB Rexroth Mecman
Jones Judson H.
Ramirez Nestor
Townsend and Townsend / and Crew LLP
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