Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
2001-09-04
2002-07-09
Hail, III, Joseph J. (Department: 3723)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
C029S278000, C029S271000
Reexamination Certificate
active
06415491
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to a device for replacing toothed belt pulleys on motor vehicle engines, comprising a pull-off disk, which is provided with at least two tie rods, which can be brought into engagement with at least two openings of the toothed belt pulley in an axially firmly seated manner for pulling off the toothed belt pulley, and a spindle drive, which is arranged essentially centrally in the pull-off disk and by the actuation of which the toothed belt pulley is pulled off from its seating by means of the pull-off disk engaging the toothed belt pulley.
BACKGROUND OF THE INVENTION
A device of this type (prospectus of the company Facom; “Facom-Automativ” Sonderaktion 98-99, page 8) has been known, which comprises a pull-off disk, which is provided with three tie rods. This prior-art device is used to replace toothed belt pulleys of a motor vehicle engine, which are provided for driving, e.g., the camshaft of the motor vehicle engine. To pull off the toothed belt pulley, this prior-art device with its tie rods can be engaged with three corresponding openings of the toothed belt pulley in an axially firmly seated manner.
The tie rods have an essentially cylindrical design and have at their free end located toward the toothed belt pulley a receiving groove directed in the circumferential direction of the pull-off disk, with which groove they can be brought into positive-locking engagement with the edge areas of one of the openings of the toothed belt pulley.
Furthermore, the pull-off disk of the prior-art device is provided with an essentially centrally arranged spindle drive, by the actuation of which the toothed belt pulley is pulled off from its seating by means of the pull-off disk engaging the toothed belt pulley and the tie rods of the said pull-off disk. The spindle drive is actuated by means of a commercially available wrench, e.g., in the form of a so-called ratchet, which is placed on a corresponding drive hexagon of the spindle drive.
In the prior-art device, the spindle drive comprises a pressure screw, which has the above-mentioned drive hexagon on its outer free end and which is screwed axially adjustably into a central, threaded through hole of the pull-off disk. During the pull-off operation, this pressure screw presses with its end located opposite the drive hexagon the seating or the end of the camshaft on the front side, so that an axial relative movement of the pull-off disk in relation to the camshaft will be obtained. Since the pull-off disk with its tie rods in the openings of the toothed belt pulley engages the toothed belt pulley in an axially firmly seated manner, the toothed belt pulley is pulled off from its seating at the same time during this operation.
In the case of toothed belt pulleys seated extremely firmly on their seating, it is frequently necessary to lock the toothed belt pulley in its particular rotated position. A so-called drive belt lock, which comprises a toothed belt band and a locking lever, is provided for this purpose according to page 9 of the above-mentioned company catalog. To lock the toothed belt pulley, the toothed belt band is placed around the toothed belt pulley and is connected by its two ends to the locking lever. The fastening of the toothed belt band to the locking lever is selected to be such that a certain pretension of the toothed belt band is obtained during the locking and the toothed belt band surrounds the toothed belt pulley with its teeth in a firmly seated manner. This so-called drive belt lock may also be used to loosen the fastening screw connection of the toothed belt pulley before the toothed belt pulley is pulled off from its seating.
This means that two tools, which must be attached separately to the toothed belt pulley in order to remove the toothed belt pulley, are needed to lock the toothed belt pulley, on the one hand, and to pull off the toothed belt pulley from its seating, on the other hand. The handling especially of the drive belt lock is very complicated, so that slipping off of the drive belt lock, e.g., due to incorrect attachment to the toothed belt pulley, is easily possible. Furthermore, the drive belt lock must be attached to the toothed belt pulley twice, namely, once to loosen the fastening screw connection and again to attach the pull-off disk with its tie rods and to be able to actuate the spindle drive because the drive belt lock is not held automatically in a firmly seated manner at the toothed belt pulley. It is not possible to attach the pull-off disk before the fastening screw connection has been loosened because the fastening screw is not accessible from the outside with a corresponding wrench when the toothed belt pulley is attached.
To avoid the complicated attachment of the drive belt lock, at least to loosen the fastening screw connection, a lever tool, which is called a drive disk carrier and which can likewise be brought into engagement with corresponding openings with locking pins in a positive-locking manner, has been known from page 8 of the above-mentioned company catalog. The fastening screw connection of the toothed belt pulley is freely accessible from the outside in the case of this wrench and this drive disk carrier can also be inserted into the corresponding openings of the toothed belt pulley in a very simple manner. Thus, two individual tools, which must be engaged individually with the toothed belt pulley, are necessary to replace a toothed belt pulley according to the devices known from the said company catalog of the firm of Facom, and three individual tools are necessary for simple handling, because the drive disk carrier cannot be used for the use of the pull-off disk, either, because due to its shape, this drive disk carrier covers from the outside the openings of the toothed belt pulley which the tie rods of the pull-off disk must engage to pull off the toothed belt pulley, i.e., the drive belt lock must always be used to lock the toothed belt pulley when the pull-off disk is used.
SUMMARY AND OBJECTS OF THE INVENTION
Consequently, the primary object of the present invention is to improve a device of this type for removing or replacing toothed belt pulleys such that an extremely simple and safe handling is guaranteed, and, in particular, the above-mentioned drawbacks of the prior-art device are avoided.
This object is accomplished according to the present invention in that to receive the spindle drive, the pull-off disk has a central, threaded through hole, through which a wrench can be attached to the fastening screw connection of the toothed belt pulley, and that the pull-off disk has at least one additional opening for receiving in a positive-locking manner a coupling piece of a locking tool, by which the toothed belt pulley can be locked in its particular rotated position by means of the pull-off disk.
An extremely simple device which can be handled in a reliable manner is made available for replacing toothed belt pulleys due to an embodiment according to the present invention.
To receive the spindle drive, the pull-off disk is provided for this purpose with a central, threaded through hole, through which a wrench can be attached to the fastening screw connection of the toothed belt pulley. Such a wrench may be, e.g., a standard socket in conjunction with a ratchet. Provisions are made according to the present invention for the threaded through hole to have a correspondingly large diameter for the spindle drive, through which such a socket can be inserted to loosen the fastening screw connection of the toothed belt pulley and attached to the fastening screw connection.
At the same time, the pull-off disk is provided with at least one additional opening to receive a coupling piece of a locking tool in a positive-locking manner. Such a locking tool may be, e.g., a simple, bent locking lever, at the bent end piece of which a corresponding coupling piece is provided. This coupling piece may be designed, e.g., as a simple square, which can be introduced into the additional opening of the pull-off disk in a positive-l
Hail III Joseph J.
Klann Tools Ltd.
McGlew and Tuttle , P.C.
Wilson Lee
LandOfFree
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