JPS614675A - Suction unit for screw clamping tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a suction unit for a screw tightening tool that suctions and supplies the tip of a kebit such as a headed bar used in an air screwdriver, an electric screwdriver, or the like.

Structure of the conventional example and its problems As shown in Fig. 1, the suction unit of the conventional screw tightening tool has a threaded portion at the tip of the clutch case 1, which is the casing of the mechanical part of the screw tightening tool body. was provided, and the suction part 2 was attached to the screw tightening tool main body 1 by screw fastening with the screw capital at the rear end of the suction part 2. However, with the above configuration, the threaded portion must be provided in advance on the clutch case 1, or the threaded portion must be provided by post-processing, which increases the cost of threading and increases the threading cost during post-processing. The disadvantage is that it takes time and effort to remove the clutch case 1 from the tightening tool body. Furthermore, it is difficult to position the L-pipe joint with respect to the screw tightening tool body, and it also has the disadvantage that it gets in the way during screw tightening work.

As shown in FIG. 2, the rear end of the vacuum cap 4 is fixed to the tip of the adjustment nut 3 with a body nut 5 in the form of a ring. However, in this case, since the adjustment nut 3 is not moved when adjusting or changing the screw tightening torque, the vacuum cap 4 moves and the suction pipe 7 attached to the vacuum cap 4 also moves. The positional relationship between the bit 6 and the suction pipe 7 changes, making it impossible to suction the screw, and by not moving the slide guide 8 each time,
This method has a disadvantage in that the positional relationship between the human body 6 and the suction pipe 7 must be completely adjusted.

Purpose of the Invention In view of the above drawbacks, the present invention provides a scale that serves as a guide for setting screw tightening torque! This is a method of attaching the suction part to the thread thinning tool body using a joint holding the SL, and the suction part can be attached and detached with one touch without providing a threaded part on the clutch case etc., and without post-processing. The present invention provides a suction unit for a screw tightening tool that can adjust and change the screw tightening torque.

Composition of the Invention The present invention provides a screw tightening tool body equipped with a shut-off clutch and a clutch case, which is a casing of a mechanical part thereof, and a cursor located on the outer circumference of the clutch case, which is a casing of a mechanical part of the tool body, and which is attached to the clutch case so as to be movable in the longitudinal direction. A cap-shaped adjustment nut with a diameter, a scale that covers the outer periphery of the adjustment nut and serves as a guide for setting the screw tightening torque. It consists of a vacuum cap attached to the tip and a suction pipe attached to the vacuum cap so that it can appear and retract freely, and is biased by an elastic body to the vacuum cap. By integrating,
The position of the L-pipe joint of the vacuum cap relative to the screw tightening tool body can be arbitrarily determined, and the vacuum cap can be attached to and detached from the screw tightening tool body with a single touch. In addition, by moving the adjustment nut longitudinally through the opening on the outer circumference of the joint, the screw tightening torque can be easily adjusted without moving the vacuum cap with it attached. It has a unique effect.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 (shows an outline of an electric screwdriver which is an example of a screw tightening tool constituting the suction unit ℃ of the screw thinning tool of the present invention; 9 is a screwdriver body cover; 10 is a screwdriver;
11 indicates the scale, and tightening indicates the torque on the tail cover; 11 indicates the screw tightening between the threaded part on the inner circumference and the threaded part of the driver body cover 9; the driver body cover 9;
Insert the stepped portion of the outer periphery of the tail cover 10 with the body nut used to assemble it, and attach it to the driver cover 10. 12 is a clutch case which is the casing of the driver mechanism, and has a threaded part on the outer periphery. Reference numeral 13 denotes an anoyastonado with a cursor on its outer periphery, which is movable in the longitudinal direction by screw movement between the inner part on its inner circumference and the threaded part on the outer periphery of the clutch case 12, and is capable of adjusting the spring pressure of the torque spring 14 inside the clutch case 12. and set the screw tightening torque.

Fig. 4 shows the suction unit of the screw tightening tool of the present invention, where 9 (d trino, one main body cano, -111 is the body nut, 12 (is the clutch case, 13 is the Abjast Nano l-, hereinafter referred to as "2"). The configuration is the same as that shown in FIG.

The torque spring (14) that sets the screw tightening torque (151
is a joint having a scale similar to that of the tail cover 10 in FIG. . Further, the shear adjust nut 13 can be moved through the opening on its outer periphery by screw movement. 16 is a spring seat that receives the torque spring 14; 17 is a needle roller that transmits the amount of movement of the abrasive needle 13 to the torque spring 14; 18 is a vacuum cap that is fastened to the tip of the joint 15 with a threaded portion; Has a threaded part around the circumference. 19 is a hose connected to a vacuum pump or the like (not shown) and transmits negative pressure to the vacuum cap 18; 2o is an LU pipe joint that connects the vacuum cap 18 and the hose 19; 21 is a vacuum cap 18
and the clutch case 12, there is a ring that maintains negative pressure in the vacuum cap, 22 is a bit that transmits rotational motion from the driver body to the screw, and 23 is a bit that attracts the screw with negative pressure and supplies it to the tip of the bit 22. The suction pipe 24 has a threaded portion on the outer circumference, and is a slide guide that can be moved by screw movement with the threaded portion on the inner circumference of the end of the vacuum cap 18, and guides the outer circumference of the suction pipe 23 with its inner circumference. Adjust the position with the human 22 according to the length of the screw.

A stopper link 25 has a threaded portion on the inner circumference, and the threaded portion of the slide guide 24 and the end face of the vacuum cap 18 function as a lock nut to fix the position of the slide guide 24. 26 is a compression spring that biases the suction pipe 23;
Reference numeral 27 denotes a spring guide which is received by the stepped portion of the inner surface of the vacuum cap 18, and receives the compression spring 26. Note that the portion consisting of 18 to 27 is referred to as suction section A.

The installation procedure for the suction unit of the screw tightening tool constructed as described above will be explained below.

3, loosen the body nut 11, remove the tail cover 10 from the driver body cover 9, and remove the
The body nut 11 is placed over the joint 16 shown in the figure in advance, and the suction portion is screwed onto the joint 16 to attach it. Then, by arbitrarily determining the position of the L pipe joint 20 of the suction part A with respect to the driver body cover 9, and then fastening the body nut 11 to the driver body cover 9,
The suction part Ai can be attached to the driver body cover 9 via the joint 15.

As described above, according to this embodiment, the adjustment nut 13 is movable in the longitudinal direction by screw movement with the outer circumference threaded portion of the clutch case 12, and has a cursor on the outer circumference.
For tightening, there is a scale 9 that serves as a guide for torque setting, and the stepped part on the outer periphery of the screwdriver body cover 9 and the body nut 11 are tightened with P scissors, and the joint 15 and its tip are joined. By providing the suction part Ai that can be attached to the body nut 11, the suction part A can be attached and detached with one touch by simply tightening and loosening just one threaded part of the body nut 11, and the threaded part of the adjustment nut 13 can be moved to make it thinner. The torque can be set. Note that the joint 15 can be attached to the driver body cover 9 with a snap stopper, and the adjustment nut 13 can be moved by sliding with the clutch case 12, and fixed with a cent bolt. I don't mind.

In addition to the effects of the invention, the present invention has the following advantages:
There is a cap-shaped ablation nut with a cursor on the outer circumference that is attached to the outer periphery of the clutch case, which is the main part of the thread thinning tool body and its mechanical part, and is attached so that it can be moved in the longitudinal direction. A cylindrical joint with a scale D' that covers the outer circumference and serves as a guide for screw tightening torque setting, and a cylindrical joint with an opening on a part of the outer circumference, a vacuum cap that is attached to the tip end, and an elastic It consists of a suction pipe that is biased by the body and attached so that it can come out and go out freely. The relative position of the L-pipe joint of the vacuum cap can be determined, and it can be attached to and detached from the screw tightening tool body with one touch. By moving the adjustment nano If in the longitudinal direction from the opening on the outer circumference of the joint, the thread thinning torque can be easily adjusted and changed without moving the vacuum cap once attached to the joint.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a suction unit of a conventional screw tightening tool, FIG. 2 is a partially sectional front view of another conventional example, and FIG. 3 is a screw tightening tool according to an embodiment of the present invention. FIG. 4 is a front view of the electric screwdriver to which the suction unit is attached, and FIG. 4 is a partially enlarged front view of the same section. 11... Hotina nut, 13... Adjustment nut, 16・Joint, A... Adsorption part. Name of agent: Patent attorney Toshio Nakao (1 person)
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Claims (3)

[Claims] (1) In a suction unit for a screw tightening tool equipped with a shut-off clutch, it is provided on the outer periphery of the screw tightening tool body and the clutch case, which is the casing of the mechanical part, and is attached so as to be slidable in the longitudinal direction, and A cap-shaped adjustment nut with a cursor on the periphery, a scale provided on the outer periphery of this adjustment nut as a guide for setting the screw tightening torque, and a cylindrical shape with an opening on a part of the outer circumference. A suction unit for a screw tightening tool, which includes a joint, a vacuum cap attached to the tip of the joint, and a suction pipe biased by an elastic body and attached to the vacuum cap so as to be freely retractable. (2) The suction unit for a screw tightening tool according to claim 1, which is provided so that the screw tightening tool main body and the joint can be attached with a screw. (3) The suction unit for a screw tightening tool according to claim 1, which is provided to connect the screw tightening tool main body and the joint with a ring-shaped nut.