Cutters – for shaping – Including holder having seat for inserted tool – Tool adjustable relative to holder
Reexamination Certificate
1999-04-30
2001-05-15
Tsai, Henry (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
Tool adjustable relative to holder
C407S092000, C407S095000, C407S103000
Reexamination Certificate
active
06231276
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an adjustable stop for an insert arranged in the main casting or body of a tool having a stop member in the form of a hollow cylinder which is slotted and can be spread by means of an adjustment screw.
2. Background Information
Such an adjustable stop is known, for instance from the published German Patent Application No. 42 43 586 A1. The stop serves in the adjustment of a cutter in the form of a knife guided in a guide slot of a main casting or body of a tool. The adjustable stop comprises a stop member in the form of a hollow cylinder over its entire length, the slotted head of which can be expanded in a radial direction by means of an adjusting screw in order to displace the cutter. For this purpose, the stop member is inserted into a stepped bore provided in the main casting or body, whereby the remaining area of the stepped bore extending to the face of the main casting or body and having a closed circumference defines the adjustment lift.
Due to the different radii of curvature of the stop on the one hand and of the remaining area of the stepped bore on the other, contact is achieved only at points both at the side of the stop facing the cutter as well as on its opposite bearing side facing the main casting. This has the disadvantage that even at low clamping or cutting forces, the stop is overloaded as a result of a high local stress concentration. That in turn can lead to a loss of positioning accuracy and/or stability. Since in addition, the inside threads guiding the adjusting screw follow along the slotted area of an adjustment movement required for a particular adjustment, and consequently positive thread engagement no longer exists in this area, the stability under load of such a threaded connection is only limited, especially at maximum adjustment.
OBJECT OF THE INVENTION
The object of the invention is therefore to provide an adjustable stop for an insert adjustably arranged in the main casing of a tool in which the load capacity of the connection between an adjustment screw and threads guiding said screw is particularly high.
SUMMARY OF THE INVENTION
This objective can be attained in accordance with the present invention by an adjustable stop for a cutter adjustably arranged in a main casting of a tool and having a stop member in the form of a hollow cylinder, which stop member is slotted and can be spread by means of an adjustment screw. A sleeve member can be provided that can be inserted into a longitudinal bore of the stop member, said sleeve member having inside threads that can be brought into engagement with the adjusting screw.
In a preferred embodiment, the end of the longitudinal bore of the stop member at the stop end can be provided with a substantially conical internal surface (inner cone) adjoined by a seat area for the sleeve member. This conical form of the head area of the stop member can make a particularly precise adjustment of the insert possible. The arrangement of several transverse slots, which preferably can subdivide the cross-sectional area of the stop member into substantially equal segments, can make it possible to control the effective direction of expansion. Thus, for instance, it is possible to bring about two effective directions at an acute angle to one another by means of three transverse slots on the stop side of the stop member facing the cutter. Each transverse slot preferably can have an expansion bore in its inner end region.
In one possible embodiment of the present invention, multiple transverse slots can subdivide the the cross-sectional area of the stop member into equal or substantially equal segments. The direction of expansion of the segments can be controlled. Thus, for example, three transverse slots can be positioned in the stop side of the stop member. The segments can therefore be expanded at acute angles to one another. Each transverse slot can have a corresponding expansion bore.
The sleeve member can be expediently inserted into the longitudinal bore of the stop member from the face opposite the insertion end for the adjustment screw. At its open end, the sleeve member is advantageously formed in the shape of a collar, in which at least one collar part of a corresponding retaining collar can be engaged with a supporting shoulder in the form of a recess provided in the elongation of the transverse slot of the stop member. In a simple manner, this fixes the sleeve member in an axial direction and prevents it from turning in relation to the stop member as well.
In another possible embodiment of the present invention, the sleeve member can be inserted into the longitudinal bore of the stop member from the end opposite the insertion end for the adjustment screw. At its open end, the sleeve member can be advantageously formed with a retaining collar structure extending about and around the end. At least part of the retaining collar structure can be engaged with a supporting shoulder in the form of a recess provided adjacent the transverse bore of the stop member. In a simple manner, the engagement of the retaining collar with the recess and supporting shoulder can fix the sleeve member in the axial direction and can prevent the sleeve member from turning in relation to the stop member.
Beneath the head end of the stop member, an open area is provided between the stop member and the sleeve member so that the inside threads can follow an adjustment movement particularly well. At the same time, a corresponding relief to produce the open area is provided on the internal sleeve end so that the outside diameter of the sleeve member at that point is smaller than the internal diameter of the stop member by the amount of the open area.
In one possible embodiment of the present invention, beneath the head end of the stop member, an open area can be provided between the stop member and the sleeve member so that the inside threads of the sleeve member can follow an adjustment movement particularly well. The sleeve member can have on its end a corresponding relief or recessed portion or cut-away portion to produce the open area. The outside diameter of the portion of the sleeve member adjacent the relief is smaller than the internal diameter of the stop member, thereby producing the open area.
In an expedient further development of the stop member, a relief or recessed portion or cut-away portion limiting the adjustment lift or defining it can be provided in the outer surface of the stop member in a manner analogous to the relief of the sleeve member. This relief in turn can determine the amount of freedom for a maximum adjustment. Furthermore, the bearing area of the stop member facing the main casting or body can be expediently rounded off, whereby this bearing area at least approximates the round form. In addition to being easily manufactured, this rounded off or half round bearing area can make particularly precise positioning and radial alignment of the contact surface between the stop member and the main casting of the tool possible during adjustment or setting.
In contrast, the stop side facing the insert can have a linear form, making it possible to obtain a broad area of contact between the insert and the stop head of the stop member. In this connection, the stop side is advantageously executed in the form of a collar in which the stop surface to be brought into contact with the insert is inclined toward the side of the stop member facing the head. The result of this is that the stop or contact surface with the insert is larger than in a vertical surface orientation. In addition, this brings about additional support between the insert and stop member in the form of a wedging action.
The stop member can be mounted in the main casting of the tool by screwing, pinning or clamping. The stop member may also be connected with the main casting by a joint connection. However, a stop in the form of a ball can be expediently provided for the fixation of the stop member in the main casting of the tool. For this purpose, the stop member has at least o
Jager Horst
Muller Gebhard
Voll Martin
Kennametal Hertel AG Werkzeuge + Hartstoffe
Nils H. Ljungman & Associates
Tsai Henry
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