Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Reexamination Certificate
1999-08-27
2001-04-10
Briggs, William (Department: 3722)
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
C173S178000, C408S23900A, C409S232000, C451S344000
Reexamination Certificate
active
06213695
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an automatic spindle arresting device, for hand tools especially for drill screwdrivers, angle grinders and the like.
BACKGROUND OF THE INVENTION
The DE 297 15 257 U1 discloses a driving device for a spindle of a motor-driven, hand-guided working tool, especially a drilling or impact screwdriver, with a driving part, which is connected with the spindle, so that there cannot be mutual rotation, and which can be coupled in both directions of rotation of the spindle over clamping bodies in the form of rollers of a free-wheel with a ring, which is fastened to the housing, with a driving part, which is disposed equiaxially to the spindle and has unlocking elements, which interact with the rollers, which act as clamping bodies and, when the driving part is driven, release the clamping bodies so that the driving part is uncoupled from the ring fastened to the housing and can be rotated, and with torque-transmnitting driving surfaces being provided at the driving part and the driving part for driving the spindle by motor, in the neutral position of the driving part the distance between the driving surfaces being larger than the distance between the unlocking element and the assigned clamping body. In the case of this driving device, the driving part has claws, which are spatially separated from the unlocking element and protrude into the driving part, the surfaces of the claws and of the driving openings, which face one another in the respective direction of rotation, forming the torque-transferring driving surfaces. For the driving device, a total of six clamping bodies in the form of balls are provided. The construction of such an automatic spindle arresting device or driving device is very expensive. As a result, the installation is very expensive and costly since, aside from the driving part and the driving part, six clamping bodies must be installed. Considering the large number of moving parts, malfunctions, breakdowns and defects in the spindle arresting device cannot be excluded.
Furthermore, the EP 0 761 350 A1, for example, also discloses a spindle arresting device, the construction of which is expensive.
Furthermore, DE 44 45 597 A1 and DE 44 45 598 A1 disclose spindle 1 arresting devices in the form of adapters. These also have a relatively complicated construction.
OBJECT OF THE INVENTION
It is an object of the invention to develop an automatic spindle arresting device for hand tools of the generic type further in such a manner, that they comprise the least possible number of individual parts, can be produced in a simple manner and, as far as possible, are not susceptible to breakdowns and are resistant to wear.
SUMMARY OF THE INVENTION
This objective is accomplished pursuant to the invention for an automatic spindle arresting device for hand tools of the type described above by the distinguishing features of claim
1
.
Owing to the fact that the unlocking elements comprise one or more control curves disposed at the driving part and one or more control cams sliding along the control curves by a rotational movement of the driving part in such a manner, that the latching part and the arresting part can be uncoupled by axially shifting the latching part and/or the arresting part, an automatic spindle arresting device is made possible, which functions reliably, has a simple structure and therefore is manufactured easily, and is resistant to wear.
As far has the construction of the arresting part, the driving parts and the latching part is concerned, different constructions are conceivable in principle.
In the case of an advantageous embodiment, provisions are made so that the arresting part is disposed attached to the housing, provided with openings, and disposed concentrically to the spindle, it being possible to engage locking cams, disposed on the than latching part, by shifting the latching part axially. Such an arresting part, which is provided with openings, can be produced simply and installed easily in the housing.
Moreover, provisions can also be made so that the arresting part is formed in one piece with the housing. In this case, additional installation of the arresting part can be omitted completely.
Preferably, moreover, provisions are made so that the openings in each case are disposed offset by the same angle in the arresting part. This enables the spindle to be arrested quickly in both direction of rotation
Likewise, provisions are advantageously made so that the arresting cams and the control cams are disposed in each case consecutively on the latching part, being offset by the same angle as the openings in the arresting part.
The arresting part advantageously is disposed, so that it can be shifted axially on the spindle against a restoring force of a restoring spring, acting in the direction of the arresting part. By means of these restoring springs, it is ensured that, when the hand tools is at rest, the arresting cams, disposed on the latching part, engage the openings of the arresting part.
In the case of a different, advantageous embodiment, which can be used especially with hand tools with a planetary gearing and a torque coupling, provisions are made so that the arresting between the housing and the arresting part is brought about by a latching part assigned to the housing.
The arresting part is, for example, a planet carrier of a planet gearing.
The driving element preferably is an internal gear of the planet gearing.
Advantageously, provisions are made so that the openings are disposed at always the same angle in the planet carrier. By these means, rapid arresting is made possible in both direction of rotation of the spindle.
The arresting cams and the control cams are disposed consecutively at the latching part, being offset by the same angle as the openings in the planet carrier.
The axially displaceable latching part advantageously is disposed at the housing so that that it cannot rotate relative to the housing and, moreover, against a restoring force of a restoring spring, acting in the direction of the planet wheel. By means of these restoring springs, it is ensured that the arresting cams, disposed on the latching part, engage the openings of the planet wheel, acting as arresting part, when the hand tool is stopped.
In the case of a hand tool machine, which has a torque coupling, provisions are advantageously made so that the internal gear is part of a torque coupling, the periodicity of the clamping bodies of the torque coupling corresponding to the periodicity of the control paths or control cams.
The control paths, disposed on the driving part, can be limited by a unilateral stop. In this way, a precise disengagement of the arresting part from the driving part and the reverse are realized and an unwanted, renewed engagement of these two parts is avoided.
The control paths themselves can be constructed in different ways. One embodiment, which is particularly advantageous with respect to its manufacture, makes provisions so that the control paths have a basic surface, an essentially flat inclined surface with an inclination disposed in the axial direction and a flat plateau surface, which adjoins the inclined surface and extends perpendicularly to the axial direction.
REFERENCES:
patent: 4407615 (1983-10-01), Kulhmann
patent: 4489525 (1984-12-01), Heck
patent: 4650375 (1987-03-01), Millsap
patent: 4758754 (1988-07-01), Fink et al.
patent: 4915555 (1990-04-01), Smothers
patent: 5022188 (1991-06-01), Borst
patent: 5263283 (1993-11-01), Rudolf et al.
patent: 5430944 (1995-07-01), Shilling
patent: 5564872 (1996-10-01), Veil
patent: 5709275 (1998-01-01), Neumaier
patent: 44 45 597 A1 (1996-06-01), None
patent: 44 45 598 A1 (1996-08-01), None
patent: 297 15 257 01 U (1998-01-01), None
patent: 0244203A (1987-11-01), None
patent: 0 761 350 A1 (1997-03-01), None
Briggs William
CEKA Elektrowerkzeuge AG & Co. KG
Darby & Darby
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