Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Reexamination Certificate
1999-11-22
2001-06-26
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
C279S075000, C408S204000, C408S226000, C408S240000
Reexamination Certificate
active
06250856
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a shank attaching structure in which a shank can be attached and detached to and from an arbor on a drilling machine side with one touch, that is, quickly and easily.
TECHNICAL BACKGROUND
Conventionally, there has been a shank attaching structure capable of attaching and detaching, with one touch, a shank of a cutter to and from an arbor having a base end portion fixed to a drilling machine (a electric hand drill or a drilling machine). In the one-touch type shank attaching structure, the shank of the cutter can be attached to the arbor with one touch by means of an engagement mechanism provided between the arbor and the shank by only inserting the shank of the cutter upward into an opening portion formed on a lower face of the arbor.
In the one-touch type shank attaching structure, however, a ring-shaped member (sleeve) provided on the outer periphery of the arbor should be relatively rotated with respect to an arbor body when the shank is to be detached from the arbor. With such a structure, for example, there is a disadvantage that the shank drops down if something comes in contact with the ring by mistake during the rotation of the drilling machine. In such a structure, furthermore, it is necessary to grip the shank by one of hands and to grip and rotate a ring-shaped member provided on the outer periphery of the arbor by the other hand, thereby relatively rotating the ring-shaped member with respect to the arbor body in an ordinary detaching work. More specifically, when the work of detaching the shank is to be performed, both hands should always be used inevitably.
With the shank attaching structure, furthermore, a concave portion for accommodating a part of a ball acting as an engagement member to be projectable into the inside diameter side should be provided on the inner peripheral face of the ring-shaped member. The depth of the concave portion becomes deeper in one rotational direction (almost U-shaped as seen in a section), that is, the internal face of the ring-shaped member (sleeve) is processed and the depth of the concave portion is gradually changed. Therefore, a special machine tool is required and a machine work is difficult to perform. As a result, a manufacturing cost is increased. In the shank attaching structure, furthermore, a plurality of coiled springs with small diameters should be provided for springs to energize the ring-shaped members in the direction of the rotation on the internal face of the ring-shaped member against the direction of the rotation. Accordingly, an inclined hole for holding the spring should be formed on the inner peripheral face of the ring-shaped member and the outer peripheral face of the arbor body, and assembly should be performed with the spring held in that state. As a result, a very difficult work should be inevitably carried out. In particular, it takes plenty of time and requires labors for processing to form the inclined hole with a predetermined angle on the inner peripheral face of the ring-shaped member. Furthermore, the above-mentioned one-touch type shank attaching structure is complicated. Therefore, a coolant cannot be supplied from the inside to a cutting edge portion of the tip of the shank. Accordingly, the coolant should be supplied from the outer periphery of the tool. For this reason, the coolant should be scattered to perform a drilling work. As a result, there has been a drawback that the coolant contaminates the circumference of a portion to be drilled and is scattered over an operator.
The present invention has been made in consideration of the circumstances, and it is an object of the present invention to provide a shank attaching structure which eliminates the above-mentioned drawbacks.
DISCLOSURE OF THE INVENTION
In order to solve the above-mentioned problems of the art, a first aspect of the present invention is directed to a shank attaching structure in which an engagement member is provided on an inner peripheral face of an opening portion formed on a tip of an arbor so as to freely retreat in a direction of an outside diameter, and a shank provided on a base end of a cutter is detachably attached to the opening portion of the arbor with one touch,
wherein the shank is formed to have such an outside diameter as to pass in a state in which the engagement member provided on the arbor retreats in the direction of the outside diameter, a diameter of a base end portion of the shank is further reduced to form a stepped portion for abutment, and a concave portion(s) for accommodating a projected portion of the engagement member projected in a direction of an inside diameter is /are formed on a tip side portion of the stepped portion,
a first sleeve is provided on the inner peripheral face of the opening portion of the arbor in such a manner that a tip of the first sleeve can abut against the stepped portion of the shank to retreat toward a base end side and the state in which the engagement member is caused to retreat in the direction of the outside diameter can be kept by an outer peripheral face of the first sleeve,
a holding hole for holding the engagement member in a slide operation region of the first sleeve is formed in a wall portion of the arbor,
the state in which the engagement member retreats in the direction of the outside diameter is kept until a tip of the first sleeve pressed toward an open end by an elastic member to be abut by the stepped portion of the shank,
a second sleeve is provided on the outer peripheral face of the arbor for being moved in at least one of directions of an axial tip and a base end, pressing the engagement member in the direction of the inside diameter by the inner peripheral face of the second sleeve with the movement in one of the directions, and accommodating the engagement member in the direction of the outside diameter without the movement in one of the directions, and
the second sleeve is pressed in one of the directions by an elastic member, thereby keeping a state in which the engagement member is accommodated in the concave portion of the shank, and the second sleeve is moved in a direction opposite to the one of the directions against elastic force of the elastic member, thereby causing the engagement member to retreat in the direction of the outside diameter.
According to the shank attaching structure in accordance with the present invention, when the second sleeve is simply caused to slide in one of the axial directions (the direction of the base end side or tip side) against the elastic member, the press of the engagement member in the direction of the inside diameter is released so that the engagement member retreats (moves) toward the outside diameter in the radial direction. As a result, the engagement of the shank by the engagement member is released. Consequently, the shank of the cutter can easily be detached from the arbor. Furthermore, when attaching the shank to the arbor, the shank is simply inserted into the opening portion of the arbor. Consequently, the stepped portion for abutment of the shank causes the first sleeve to retreat toward the base end side of the arbor. As a result, the engagement member projects toward the inside diameter in the radial direction. By the inserting operation, the engagement member is moved over the outer peripheral face of the shank in the axial direction in contact therewith. As a result, a projected portion of the engagement member toward the inside diameter side is accommodated in the concave portion formed in the shank. Thus, the shank is held in the arbor.
Accordingly, an operator can simply insert the shank into the opening portion of the arbor when attaching the shank, and can easily detach the shank by causing the second sleeve to slide toward the tip or the base end side against the elastic member. In other words, the shank can easily be attached and detached to and from the arbor by one hand. Furthermore, the second sleeve slides in one of the directions (the direction of the tip side or base end side) so that the shank can be attached and detached.
Howell Daniel W.
Kabushiki Kaisha Miyanaga
Marshall O'Toole Gerstein Murray & Borun
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