Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Reexamination Certificate
1999-08-11
2001-04-17
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
C279S140000, C279S902000
Reexamination Certificate
active
06217033
ABSTRACT:
BACKGROUND OF THE INVENTION
There are many kinds of power rotary tools such as an electric power drill, a battery drill, a hammer drill, a vibratory drill, an electric power driver or the like.
The electric power drill and the battery drill are used to perform boring work for iron plate or the like and boring work for woody material.
Also, the hammer drill and the vibratory drill are used to perform boring work while imparting vibrations to stone material or the like by a built-in vibration generating mechanism or the like. The electric power driver is used to perform screwing work for a board or the like by a built-in clutch.
The present invention relates to a chuck device for gripping a tool, used for mounting a tool (such as a drill bit and a driver bit) for rendering the tool to perform the above-described various works.
In a chuck device having a structure for gripping a tool only by a manual operation without any tool, in order to generate a large tool gripping force with a small torque (torque obtained by manual rotation), and in order to keep a smooth rotation of a rotary nut engaged with claws even if a fastening reactive force in a thrust direction is applied to the rotary nut, balls (steel balls) are interposed between a back surface of the rotary nut and a flange extending from a chuck body.
In such a chuck device having the structure for gripping the tool only by the manual operation without any tool, since the balls are arranged for the above-described reason, the rotary nut is smoothly rotated but this means that the screwed and fastened rotary nut is likely to be loosened.
Therefore, so far, there has been proposed a chuck device having a structure provided with a means for preventing the loosening of the rotary nut, in particular, a chuck device for preventing the grip of the tool is prevented from being loosened due to the vibrations or the like when the work is carried out by using an electric rotary power tool incorporating the vibration generation mechanism, an electric rotary power tool incorporating a shock generating mechanism or an electric rotary power tool incorporating a clutch mechanism.
In, for example, U.S. Pat. No. 5,145,194 (hereinafter referred to as a prior art example), recess portions are provided in the rolling surface per se of the balls, a resistance is imparted to exhibit the loosening preventing effect by the resistance when the balls that are present in the recess portions are disengaged from the recess portion while rotating (orbiting while rotating about their own axes).
However, in the prior art, the recess portions are formed in the rolling surface, when the fastening reactive force is applied in the thrust direction to the balls, the balls are not rotated smoothly. This means that it is impossible to obtain a large tool gripping force for the chuck device for holding the tool only by the manual operation without using any tool and would become fatal (To prevent the loosening while sacrificing the maintenance of the large tool gripping force is completely opposed to the inherent purpose.) In the case where the balls are present on a border between the recess portions and the flat surfaces therearound, i.e., at the ridge positions, the fastening reactive force is applied in the thrust direction without any change so that a large surface pressure is applied to the ridge line, resulting in deformation of the ridge line. This damages the ridge lines of the recess portions due to the repeated use, resulting in the degradation of the loosening prevention effect.
SUMMARY OF THE INVENTION
In order to overcome the above-noted defects, an object of the present invention is to provide a chuck device that may prevent the loosening of the grip of a tool while exhibiting a large tool gripping force.
The essence of the present invention will now be described with reference numerals.
A chuck device in which claws threadedly engaged with a rotary nut are moved back and forth to be opened and closed by rotation of the rotary nut provided on a body, and a tool is clamped by the claws, is characterized in that a receiving portion is provided to face a rear surface of the rotary nut, rolling members are provided between the receiving portion and the rotary nut, the rear surface of the rotary nut and/or a front surface of the receiving portion is formed to be slanted surfaces expanding to the outside, and surfaces on which the rolling members are moved outwardly to contact when the tool is clamped by the claws and a fastening reactive force in a thrust direction is applied to the rolling members are formed into a movement suppressing surface for suppressing movement of the contacted rolling members.
Also, a chuck device in which a rotary sleeve provided on a body is rotated, claws threadedly engaged with a rotary nut are moved back and force to be opened and closed by the rotation of the rotary nut rotating together with the rotary sleeve and a tool is clamped by the claws, is characterized in that a receiving portion is provided to face a rear surface of the rotary nut, rolling members are provided between the receiving portion and the rotary nut, the rear surface of the rotary nut and/or a front surface of the receiving portion is formed to be slanted surfaces expanding to the outside, and surfaces on which the rolling members are moved outwardly to contact when the tool is clamped by the claws and a fastening reactive force in a thrust direction is applied to the rolling members are formed into a movement suppressing surface for suppressing movement of the contacted rolling members.
The chuck device according to the first or second aspect, an elastic surface warped by the contact of the rolling member is used as the movement suppressing surface.
The chuck device according to the first or second aspect, at least one of recess portions and corrugated portions is used as the movement suppressing surface.
The chuck device according to the first or second aspect, one of a plurality of recess grooves and corrugations extending in a thrust direction of the rotary nut and provided in parallel in the radial direction are used as the movement suppressing surface.
The chuck device according to any one of the first to fifth aspects, the receiving portion having an elasticity is used as the receiving portion.
The chuck device according to any one of the first to sixth aspects, at least one of steel balls, ceramic balls and plastic balls are used as the rolling members.
Also, according to an eighth aspect of the invention, there is provided a chuck device in which claws threadedly engaged with a rotary nut are moved back and force to be opened and closed by the rotation of the rotary nut provided on a body and a tool is clamped by the claws, characterized in that, when the tool is clamped by the claws and a fastening reactive force in a thrust direction is applied to rolling members, the rolling members are moved outwardly from the rolling surface and brought into contact with movement suppressing surface for suppressing the movement of the rolling members formed at positions different from rolling surface, and when the fastening reactive force in the thrust direction is eliminated from this condition, the rolling members are returned back to the original portion.
The chuck device according to the eighth aspect, when the fastening reactive force in the thrust direction is applied to the rolling members by using a slant surface, the rolling members are brought into contact with the movement suppressing surface.
When the claws are brought into contact with the tool, the movement of the claws is stopped and the fastening reactive force in the thrust direction is applied to the rolling members, the rotary nut is finely moved rearwardly from the chuck by an amount of backlash by a lead angle of the screw. At this time, since the back surface of the rotary nut and/or the front surface of the receiving portion are formed into slant surfaces expanded to the outside, the rolling members are pressed outwardly by the radial component of the fastening reactive force. The ro
Sakamaki Akira
Sakamaki Kazuo
Sato Choukichi
Bishop Steven C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Yokiwa Seiko Kabushiki Kaisha
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