Chucks or sockets – Socket type – Radially reciprocating jaws
Reexamination Certificate
1999-11-09
2001-10-16
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Radially reciprocating jaws
C279S014000, C279S905000, C279S140000, C408S226000, C408S140000
Reexamination Certificate
active
06302408
ABSTRACT:
The invention relates to tool system that can be coupled to the drive shaft of a rotary tool, such as a hand drill or a screw drill.
Such a tool system is known from JP-A-4365563. Therein is at hand essentially a so-called “bit holder”. The actual tool of this systems are bits of varying sizes, whereby each individual tool at each front-face side has a bit section as functional section. Through this the tool is coupled to the drive machine that respectively one of the two bit points is clamped into a corresponding receiving device. This has the drawback that the bit itself is utilized for centering of the tool whereby the coupling in conformity with the size of the bit more or less is force-locking. This has the drawback that the functional sections during use relatively quickly wear in conformity with the quality of the coupling. Additionally, in the device of JP-A-4365563 there is contemplated an interlocking which, however, is acting only one-sided and, therefore, adds only in unsatisfactory manner to the centering of the tool. This also increases wear of the respectively clamped functional section.
From EP-O 685 300 A1 is already known a tool system which can be coupled to a hand drill or a screw drill, which comprises a tool holding fixture and a combination tool.
The combination tool has a shaft with hexagonal profile and two functional sections which extend coaxially therefrom and at opposite sides thereof. In use according to purpose the combination tool is received in a hexagonal recess of a sleeve-like adapter which is in conformity with the hexagonal profile of the tool shaft, which can be connected to the drive shaft of the rotary tool and by means of a detent device can be axially fixed. The adapter is connectable with the drive shaft of a rotary tool. As detent device serves a detent ball received in a radial recess which transgresses the cylinder mantle of the adapter. In a locking position the detent ball projects with a calotte into the recess of the adapter and extends into a surrounding radial groove in the shaft of a tool which is received in the adapter. The detent ball is held in the locking position by a calotte which is axially movable on the adapter forward into the recess of the adapter forward and extends into a surrounding radial groove in the shaft of a tool received in the adapter. The detent ball is held in the locking position by a locking sleeve which is axially movably received on the adapter, which due to the axial displacement can be moved into a position allowing the detent ball to be released to carry out radial avoidance.
It is of disadvantage in the prior known tool system that the detent ball which serves for the axial fixing must absorb the forces which arise during use in accordance with the purpose of the combination tool. Upon frequent use of the combination tool this leads to a rapid wear of the detent ball. Also not satisfactorily is the lagging in centering of the tool within the adapter.
From DE 28 22 372 A 1 is also known a tool system which comprises a tool holding fixture and a combination tool. The combination tool described comprises a shaft with a hexagonal profile which has two functional sections that coaxially extend. This combination tool is received in a hexagonal recess of an adapter which is adapted to the hexagonal profile of the tool shaft. In axial consideration the combination tool supports itself with a conical transition section, between tool shaft and functional section, at an equally conical ring shoulder of the adapter. So as to protect the combination tool from falling out, the radial recess of the adapter receives a detent ball which is radially movable in limited manner against the action of spring forces, which co-acts with the functional section arranged ring groove. During use of the combination tool, the axial forces are absorbed by the ring shoulder of the adapter and not, as is the case in the device according to EP-O 685 300 A 1, by the detent ball. However, also in EP-O 685 300 A 1 the centering of the combination tool in the adapter is not satisfactory.
Another tool system which is comprised of a tool holding fixture and a tool system which is comprised of a tool which is releasably received therein is described in U.S. Pat. No. 5,013,194. The tool holding fixture comprises a sleeve-like adapter furnished with hexagonal recesses which is connectable with the drive shaft of a rotary tool. Into the hexagonal recess can be slid a tool having a shaft with hexagonal profile as well as a functional section coaxially extending with this. For axial fixing of the tool into the shaft of the tool holding fixture an annular groove is provided and in the wall of the adapter are arranged at same angular distances several detent balls which project in a locking position with a calotte into the recess of the adapter and reach into the annular groove of the tool shaft. Simultaneously the tool supports itself at the face-side directed towards the rotary tool of the hexagonal recess directly at the adapter. EP 0 685 300 A 1 also consists of the detent ball that is held in the locking position by a locking sleeve which is axially movable received on the adapter, which can be moved through axial shifting into a position which allows the detent ball to move into a radial, avoidance releasing position.
Also, in this prior known device, the centering of the tool in the tool holding fixture is not satisfactory. Furthermore, the tool holding fixture does not allow the use of a combination tool.
In accordance with this the invention, is an improved tool system having a tool holding fixture and a receivable tool therein, in which the drawbacks of the prior known tool systems are avoided and in which particularly the centering of the tool is improved.
This aim is solved through a tool system with the features of claim
1
.
In contrast with the prior art this tool system in accordance with the invention consists of a shaft, which is received in the polygonal recess of the reception cylinder of the tool, is supported at a centering range and thereby, on the one hand, is centered and, on the other hand, during use of the tool arising axial forces are absorbed. The detent recess of the tool shaft contains detent elements that are uniformly distributed about the circumference and co-act with the centering range of the polygonal recess which in comparison with the state of the art substantially improves the centering of the tool in the tool holding fixture. The radial forces arising in the detent element are low when the tool is used in accordance with its purpose, since they have to absorb such axial forces which arise on retracting of the tool from its operative position
The centering range of the tool holding fixture may preferably be accomplished with a conical support shoulder which is coaxially arranged with the drive shaft directing end of the polygonal recess of the reception cylinder, whereby the shaft of the tool at its end remote from the functional section has a centering cone which corresponds to the conical support shoulder. An appreciably improved centering of the tool system is obtained through co-acting of the support shoulder and the centering cone.
In another embodiment of the invention, the locking sleeve is axially configured on the reception cylinder of the tool holding fixture and comprises a movable sliding sleeve and a locking section which serves to hold the detent elements in their detent position, and one to this connected retention section, which retention section exhibits means for positioning of the locking sleeve in the locked and unlocked position. This two part configuration of the sliding sleeve is particularly of advantage under considerations of production-technology.
In the case of utilization of ball-shaped detent elements it has been shown as being useful when the locking section of the locking sleeve has a support surface which is adapted to the contour of the detent balls and can support the detent balls in the detent position in surface-contact manner. Thereby, due to appearance of axia
Bishop Steven C.
Collard & Roe P.C.
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