JPH11257321A - Bit structure for driver and recess structure for screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a probability of fitting a driver into a screw by forming, in a crest shape, an outer peripheral surface of a flat plate blade for forming a crossed blade extending from a shaft part tip end part along an outer peripheral surface so as to have a ridge line part which extends in an axial direction. SOLUTION: A crossed blade 11 of a driver 10 is formed of four flat plate shaped blades 12, and each ridge line part 14 of a crest shaped cross section is formed on each outer peripheral surface 13 inserted in a crossed groove of a screw of the flat shaped blade 12. A tip end part 15 of the crossed blade 11 is formed in a conical shape, and parts having outer peripheral surfaces 13 are respectively set as a nearly uniform wall thickness in an axial direction of the driver 1. The flat blades 12 collide with a cross part of a crossed groove by formation of the ridge line parts 14, and a probability which is not fitter is a low level. If the outer peripheral surfaces 13 collide with circumferential wall surfaces of a crossed part, radiuses from a rotary center of the driver 10 to the outer peripheral surface 13 are different from each other. As a result, shock force applied on the driver 10 is acted in a direction where the outer peripheral surface 13 is slid along the circumferential wall surface of the crossed part 8, and a probability of fitting the crossed blade 11 into the crossed groove 4 is improved. The tip end part 15 is formed in a conical shape, and guide is facilitated, and the probability of fitting the crossed blade 11 into the crossed groove in improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bit structure of a driver and a recess structure of a screw, and more particularly, to a bit structure of a driver for turning a screw using power and a recess structure of a screw.

[0002]

2. Description of the Related Art Conventionally, a bit structure of a driver that automatically rotates by using a power source such as an air motor is shown in FIG.
3, the thing shown in FIG. 14 is known. This driver 1
A cross-shaped blade 5 fitted in a cross-shaped groove 4 (recess) formed in the head 3 of the screw 2 shown in FIGS.
Are formed. The tip of the cross-shaped blade 5 is sharpened into a truncated cone, and the outer peripheral surface 7 of a flat blade 6 forming the cross-shaped blade 5 is formed.
Is rounded so as to form the peripheral surface of the cone.

Further, the intersection 8 of the grooves 4A and 4B constituting the cross-shaped groove 4 of the head 3 of the screw 2 is formed in a round shape as shown in FIG. A horn is known.

[0004]

Recently, some automatic driver devices using an electric or air motor as a driving source include a head of a screw 2 at a tip of a cross-shaped blade 5 of a driver 1. Some parts are designed to be gripped and set.

When the screw 2 is screwed into an object (for example, a building material board) by the automatic driver device, the tip of the screw 2 set in the automatic driver device is turned to the building material board, and the automatic driver device is used. When the trigger is pulled,
After the driver 1 collides with the head 3 of the screw 2 and the cruciform blade 5 of the driver 1 fits into the cruciform groove 4 and drives the tip of the screw 2 into the building material board, the driver 1 rotates and turns the screw 2
Is screwed into the building material board.

[0006] However, the conventional bit structure and screw recess structure of the screwdriver are such that when the screw 2 is screwed into the object by the automatic screwdriver, the outer peripheral surface 7 of the cruciform blade 5 of the screwdriver 1 has the cross shape of the screw 2. The cross-shaped blade 5 and the cross-shaped groove 4 hit the intersection 8 or the intersection 9 forming the mold groove 4.
The driver 1 may rotate without completely fitting the screw, and in this state, the screw rotating at high speed and the cross-shaped groove of the screw cannot be fitted, so that the screw is lifted from the building material board and tightened. It has been completed and sufficient fastening force cannot be obtained. Further, in this state, the intersections 8 and 10 of the cross-shaped groove 4 are damaged, and it takes time and effort to pull out the screw 2, thereby lowering the workability and damaging the flat blade 6 of the driver 1. There's a problem.

In particular, each flat blade 6 forming the cross-shaped blade 5
When the circumferential angle of the outer peripheral surface 7 is large, the radius of the outer peripheral surface 7 is constant, so that when it hits the intersection 8 or the intersection 9,
There is a problem that the probability that the cross-shaped blade 5 does not fit into the cross-shaped groove 4 increases.

The present invention has been made in view of such a problem, and when a screw is screwed by an automatic driver device, the probability that the cruciform blade of the driver fits with the cruciform groove of the screw is determined. It is an object of the present invention to prevent failure of screwing work and damage to a driver.

[0009]

According to a first aspect of the present invention, there is provided a bit structure for a driver, which is engaged with a cross-shaped groove of a screw head at a tip of a shaft of the driver. In the bit structure of the driver in which the cross-shaped blade is formed, the outer peripheral surface of the flat blade extending from the tip of the shaft portion along the outer peripheral surface of the shaft portion to form the cross-shaped blade is axially moved. It is characterized in that it is formed in a mountain shape so as to have an extending ridge portion.

According to a second aspect of the present invention, there is provided a bit structure of the driver according to the first aspect, wherein the ridge of at least one flat blade of the cross-shaped blade has a thickness of the flat blade. It is characterized by being deviated left or right from the center line.

According to a third aspect of the present invention, there is provided a screw recess structure,
A screw recessed structure in which the cruciform blade of the driver according to any one of claims 1 and 2 is fitted, wherein four corner-shaped intersections forming intersections of cruciform grooves formed in the screw head are provided. Either, a ridge extending in the axial direction of the screw away from the bisector of the intersection angle of the pair of grooves forming the cross-shaped groove,
It is characterized by being formed.

According to a fourth aspect of the present invention, there is provided a screw recess structure,
A screw recess structure in which the cruciform blade of the driver according to any one of claims 1 and 2 is fitted, wherein the recess extends along the bottom of a cruciform groove formed in the screw head. A gap portion that protrudes the ridge portion of the flat blade according to any one of Items 1 and 2, is formed.

[0013]

Next, a bit structure and a screw recess structure of a driver according to a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an enlarged perspective view of a bit structure of a driver according to the present embodiment.
The cross-shaped blade 11 is formed in a cross shape by four flat blades 12. A ridge portion 14 having an angled cross section is formed on an outer peripheral surface 13 inserted into the cross-shaped groove 4 (see FIGS. 17 and 18) called a recess of a screw of the flat blade 12. 4
The tip 15 of the cruciform blade 11 formed by the two flat blades 12 is formed in a conical shape. The portion 16 having the outer peripheral surface 13 of the flat blade 12 has a substantially uniform thickness in the axial direction of the driver 1 as shown in FIG.
The ridge portion 14 has a mountain-shaped cross-sectional shape, but may have a chamfered shape with a small radius of curvature.

According to the driver 10, the flat blade 12
Since the ridge 14 is formed on the outer peripheral surface 13 of the screw 2, even if the intersection 8 of the cross-shaped groove 4 of the screw 2 (see FIG. 17) has a round peripheral wall surface, Since the probability that the equally dividing position C and the ridgeline portion 14 hit is very small, the probability that the flat blade 12 of the driver 10 hits the intersection 8 of the cross-shaped groove 4 and does not fit is reduced, and the driver 1
The probability of fitting between the zero-shaped cross blade 11 and the cross groove 4 of the screw 2 is increased.

Even if the outer peripheral surface 13 of the flat blade 12 hits the peripheral wall surface of the intersection 8, the radius from the center of rotation of the driver 10 to the outer peripheral surface 13 is different.
The impact force applied to 0 acts in a direction in which the outer peripheral surface 13 slides along the peripheral wall surface of the intersection 8, and the probability that the cross-shaped blade 12 fits into the cross-shaped groove 4 is further increased. Further, since the tip 15 of the cross-shaped blade 11 is formed in a conical shape and protrudes and is easily guided, the probability of fitting between the cross-shaped blade 11 and the cross-shaped groove 4 is increased.

Further, when the cross-shaped groove 4 is fitted to the intersection 9 as shown in FIG.
The probability that the ridge line 9A coincides with the ridge line 9A is very small, and when the driver 10 is pushed into the depth of the cross-shaped groove 4, the outer peripheral surface 13 and the wall surface 9B of the intersection 9 slide with each other. The probability of fitting with the groove 4 becomes very high.

For this reason, the cruciform blade 11 of the driver 10 is caused to collide with the cruciform groove 4 of the screw 2 in the operation of screwing the screw 2 into an object (for example, a building material) by an air motor or an electric automatic driver device. When the tip of the screw 2 is driven into the object, the cruciform blade 11 of the driver 10 is easily fitted into the cruciform groove 4 of the screw 2, and even if the driver 10 is rotated, the intersection of the cruciform groove 4 This prevents the portion 8 from being damaged and the screw 2 being pulled out, and the cross-shaped blade 11 of the driver 10 from being damaged.

FIG. 4 shows that flat outer peripheral surfaces 22A and 22B are formed on all four flat blades 21 constituting the cross-shaped blade 20, and the ridge portions 23 of the outer peripheral surfaces 22A and 22B are formed by the flat blades 2.
1 shows an embodiment formed at a position deviated to one side from the thickness center line 21C of FIG.

According to the cross-shaped blade 20 of the driver 10 shown in FIG. 4, the ridge portion 23 of the flat blade 21 has a thick center line 21C.
From the outer peripheral surface 2
2A has a high probability of hitting and has a wide outer peripheral surface 2
When 2A hits the ridgeline 9A of the intersection 9 of the cross-shaped groove 4,
The probability that the outer peripheral surface 22A slides in the direction of arrow A along the wall surface 9B of the intersection 9 in the direction of arrow A, and the cruciform blade 20 rotates and fits in the cruciform groove 4 in the embodiment shown in FIGS. Higher than the ones. The outer peripheral surface 22B is the wall surface 9C of the intersection 9
The outer peripheral surface 22B has a large inclination angle with respect to the thickness center line 22C, so that the outer peripheral surface 22B escapes along the wall surface 9C, and the cruciform blade 20 rotates and fits in the cruciform groove 4. Become.

FIG. 5 is a cross-shaped blade 2 of the driver shown in FIG.
The ridge line portion 23 is formed with respect to two flat blades 21 of zero. In the driver shown in FIG. 5, the cross-shaped blade 20 is not formed to have a point-symmetrical cross-sectional shape with respect to the center of the axis.
Will be fitted into the cross-shaped groove 4 by rotation. For other configurations, the description of FIG. 4 is cited.

FIG. 6 shows a cross-shaped groove of the screw of the present invention in which the shape of the cross-shaped groove is changed. The cross-shaped groove 30 of this screw is a bisector of a center line 30C extending in the cross direction of the cross-shaped groove 30. 31
The ridgeline 33 of the intersection 32 is provided at a position away from the ridgeline 33. According to the shape of the cross-shaped groove 30 of the screw in FIG.
By using the driver shown in FIG.
Are more easily rotated in the direction of arrow B, and the cross-shaped blade 34 is rotated and fitted into the cross-shaped groove 30.

FIG. 7 shows a modification of FIG. 6, in which the cross-shaped groove 35 of the screw is such that the ridge lines 37 of two cross-sections 36 of the four cross-sections forming the cross-shaped groove 35 are crosswise. It is provided at a position away from the bisector 38 of the extending center line 35C. According to the shape of the cross-shaped groove 35 of the screw in FIG.
By using the driver shown in FIGS. 1 to 5, the cross-shaped blade 39 is further easily rotated in the direction of arrow B, and the cross-shaped blade 39 is rotated and fitted into the cross-shaped groove 35.

FIGS. 8 and 9 show the shape of the cross-shaped groove 41 of the screw head 40 into which the cross-shaped blade 11 of the driver 10 of FIG. 1 is fitted. The cross-shaped groove 41 is fitted with the cross-shaped blade 11 of FIG. 1 without any gap to increase the contact area between the flat blade 12 and the cross-shaped groove 41, and the bottom 42 of the cross-shaped groove 41 is a flat plate. It is formed in a V-shape that receives the outer peripheral surface 13 of the blade 12. At the deepest portion of the bottom portion 42, as shown in an enlarged manner in FIG. 10, a narrow groove 43 (void portion) for avoiding contact with the ridge portion 14 of the flat blade 12 is formed. This narrow groove 4
Reference numeral 3 is formed from the opening of the cross-shaped groove 41 in the screw head to the deepest part. When the cruciform blade 11 of the driver 10 is fitted in the cruciform groove 45 of the conventional screw, the ridge 14 abuts against the bottom 46 of the cruciform groove 45 as shown in FIG. Although the contact range L0 of the 40 with the cross-shaped groove 41 is reduced and the rotational torque of the driver is reduced, according to the cross-shaped groove 41 of FIGS. 8 to 10, as shown in FIG. As a result, the rotation torque of the driver can be ensured up to the vicinity of the portion 14.
Note that, here, the gap portion is configured by the narrow groove 43 having a rectangular cross section, but may be a round groove.

[0025]

According to the bit structure of the driver according to the first aspect of the present invention, the driver extends from the front end of the shaft portion along the outer peripheral surface of the shaft portion and intersects to form a cross-shaped cross section. The outer peripheral surface of the flat blade is formed into a mountain shape so that a ridge extending in the axial direction is formed. When the driver is inserted into the cruciform groove of the screw, the ridge of the cruciform blade and the cross are formed. The probability of coincidence with the intersection of the mold grooves is reduced, and the probability that the cruciform blade of the driver and the cruciform groove of the screw are fitted increases.

Accordingly, a screw is applied to an object to be screwed, such as being healthy, by an automatic driver device, an impact is applied to the screw head by a driver, and the screw is driven into an object such as a building material, and then the screwdriver is rotated to rotate the driver. When doing work,
The cruciform blade of the screwdriver becomes easier to fit into the cruciform groove of the screw head, and even if the driver rotates, damage to the cruciform groove of the screw head is reduced as much as possible. Driver damage is also reduced.

According to the bit structure of the driver of the second aspect of the present invention, the ridge portion of at least one flat blade of the cruciform blade is deviated to the left or right from the thickness center line of the flat blade. The probability of engagement between the driver and the screw head is further increased.

According to the screw recess structure of the third aspect of the present invention, the cross-shaped groove is formed at one of the four corner-shaped intersections forming the intersection of the cross-shaped groove formed in the screw head. According to the screw recess structure of the fourth aspect of the present invention, the ridge portion extending in the axial direction of the screw is formed apart from the bisector of the intersection angle of the pair of grooves to be formed. In the bottom of the formed cross-shaped groove, there is formed a gap extending along the bottom and protruding the ridge portion of the flat blade according to the first and second aspects. Even if a mountain-shaped ridge is formed on the flat blade, the range of contact between the cross-shaped blade and the cross-shaped groove is not reduced, and the transmission range of the rotational torque of the driver is prevented from being reduced. The ridge of the cross-shaped blade is prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a cruciform blade of a driver according to an embodiment of the present invention.

FIG. 2 is a view showing a concave portion of the cross-shaped blade of FIG. 1;

FIG. 3 is a view showing an outer peripheral surface of a flat blade of the cross-shaped blade of FIG. 1;

FIG. 4 is a cross-sectional view showing a contact state of a cruciform blade and a cruciform groove of a screw in which a ridge portion of the cruciform blade of the driver of FIG. 1 is shifted from a center of thickness.

FIG. 5 is a cross-sectional view showing a contact state between a screwdriver and a screw in which the cross-shaped blade of FIG. 4 is formed into two flat blades;

6 is a cross-sectional view showing a screw in which the ridge of the intersection of the cross groove on the screw head is displaced from the bisector of the center line of the cross groove, and a contact state between the screw and the cross blade of FIG. 1;

7 is a cross-sectional view showing a screw in which two positions of a ridge of a cross-shaped groove of the screw head of FIG. 6 are shifted from a bisector of a cross-shaped groove center line and a contact state of a cross-shaped blade of FIG. 5; Figure

FIG. 8: The bottom of the cross-shaped groove in the screw head is formed in a V-shape,
Top view of a narrow groove formed at the back

9 is a cross-sectional view showing a state where the cruciform groove of FIG. 8 is fitted to the cruciform blade of the driver of FIG. 1;

FIG. 10 is an enlarged partial plan view of the narrow groove in FIG. 10;

FIG. 11 is a conceptual diagram showing a state in which the cross groove and the cross blade of FIG. 10 are fitted together.

FIG. 12 is a partially enlarged view showing a state in which the cruciform blade of the driver of FIG. 1 is fitted to a conventional cruciform groove.

FIG. 13 is a partially enlarged perspective view of a cruciform blade of a conventional driver.

14 is a partially enlarged view showing the outer peripheral surface of the flat blade of the driver of FIG.

FIG. 15 is a partial side view of the head of a conventional flathead screw.

FIG. 16 is a plan view of a cross-shaped groove in the screw head of FIG. 15;

FIG. 17 is a partially enlarged view of a state in which a cross-shaped blade of a conventional driver and a cross-shaped groove of a screw cannot be inserted without being fitted.

FIG. 18 is a partially enlarged view of a state in which a cross-shaped blade of a conventional driver and a cross-shaped groove of a screw cannot be inserted without being fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Driver 11 Cross-shaped blade 12 Flat blade 13 Outer peripheral surface 14 Ridge part 32 Intersection part 33 Ridge part of intersection part

Claims (4)

[Claims] 1. A driver bit structure in which a cross-shaped blade that meshes with a cross-shaped groove of a screw head is formed at a tip end of a shaft portion of a driver, wherein from a tip end portion of the shaft portion to an outer peripheral surface of the shaft portion. A bit structure for a driver, wherein an outer peripheral surface of a flat blade extending along the cross-shaped blade is formed in a mountain shape so as to have a ridge portion extending in an axial direction. 2. The bit structure of a driver according to claim 1, wherein a vertex of a ridge portion of at least one flat blade of the cross-shaped blade is deviated rightward or leftward from a thickness center line of the flat blade. A bit structure of the driver. 3. A screw recess structure in which the cruciform blade of the driver according to claim 1 is fitted, wherein four corners forming an intersection of the cruciform grooves formed in the screw head. A screw, characterized in that a ridge extending in the axial direction of the screw away from a bisector of the intersection angle of the pair of grooves forming the cross-shaped groove is formed at one of the cross-shaped grooves. Recess structure. 4. A screw recess structure in which the cruciform blade of the driver according to any one of claims 1 and 2 is fitted, wherein the recess is formed along the bottom of the cruciform groove formed in the screw head. A recessed portion for a screw, characterized in that a void portion is formed to extend the ridge portion of the flat blade according to claim 1 or 2.