JPH08177813A - Screw for tightening - Google Patents

Abstract

PURPOSE: To provide a fastening screw capable of reducing the loss of fastening force to a minimum, obtaining the strong fastening force by a small rotation input, and obtaining the sufficient fastening force with manual operation. CONSTITUTION: When a flange ring 8 is contacted with a tool 42 to be attached and the rotation of a screw member is stopped to be in a fastening state, a ball 13 rolls in a screw groove 23, 32 to be screw fed by the rotation of an operating ring 12. The flange ring 18 is pressed by the movement of the operating ring owing to screw feeding through a controlling ring 16 to fasten the tool 42 to be attached. The ball 13 is rolling in the screw thread 23, 32, so that the rotation of the operating ring 12 at the time of screw feeding of the operating ring 12 has a resistance of almost 0, which effectively transmits the rotation force of the operating ring 12 to the flange ring 18 without a loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for fastening a rotary tool such as a grindstone for a hand grinder or a circular saw for a hand saw to a mounting screw portion (for example, a male screw) screwed on a drive shaft of an electric tool. The present invention relates to a tightening screw that can be used as a tightening screw (for example, a nut) and can be strongly tightened and fixed by a manual rotating force.

[0002]

2. Description of the Related Art Conventionally, a rotary tool such as a grindstone or a circular saw as described above is mounted on a drive shaft of an electric power tool by forming a flange and a male screw on the end of the drive shaft and rotating the male screw on the male screw. A tool has been inserted and a tightening screw having a female screw formed on the outside thereof, for example, a nut, has been screwed, and the nut has been tightened with a power tool such as a wrench.

Since the above-mentioned electric tool is a hand type (hand-held type), the posture of the electric tool becomes unstable when tightened with a wrench as described above, and workability is poor. Therefore,
If the above-mentioned tightening nut can be attached only by turning by hand, the workability will be greatly improved.

However, when the nut is manually rotated, the tightening force is lost due to the frictional resistance between the male screw and the female screw of the nut, and the manual operating force acts sufficiently as the tightening force. There is a problem that cannot be made.

[0005]

SUMMARY OF THE INVENTION The present invention provides a tightening screw that minimizes the loss of tightening force, obtains a strong tightening force with a small rotation input, and obtains a sufficient tightening force by manual operation. To aim.

[0006]

According to a first aspect of the present invention, a threaded portion of a female thread or a male thread to be screwed into a threaded portion to be attached is formed on a shaft core portion, and a shaft-shaped outer periphery is formed on an outer peripheral surface. A screw member having a portion formed therein, an operating ring for inserting the inner peripheral portion into the shaft-shaped outer peripheral portion of the screw member to input a rotational force from the outside, and an axial outer periphery of the screw member facing the operation ring. A flange ring that is rotatable and allows a slight movement in the axial direction and is in contact with the object to be attached. A screw groove is engraved and a plurality of balls are inserted in the screw groove, and a slight movement in the axial direction with respect to the screw member is allowed between the operation ring and the flange ring to prevent rotation. The restriction ring is interposed, and the above-mentioned Characterized in that to permit rotation of the clamping range was set created ring is screw tightening which is interposed a biasing means for returning to the initial position.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, a tightening screw having a thrust bearing interposed between the operation ring and the restriction ring is provided. Is characterized by.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the invention, the ball is held by a holding ring interposed between the screw grooves of the screw member and the operating ring. In addition, adjacent balls in the screw pitch direction are tightening screws that are displaced from each other in the screw pitch direction and are spaced apart from each other.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the invention, a thrust bearing is interposed between the operation ring and the regulation ring, and the thrust bearing and the regulation ring are regulated. The moderation ring is interposed between the ring and the concavo-convex portion is formed on one circumference on the mutually opposing surfaces of the moderation ring and the operation ring, and the other side is contacted with the concavo-convex portion in a biased state. It is a tightening screw having a slippery contact portion formed therein.

[0010]

In the tightening screw according to claim 1 of the present invention, when the operation ring is rotated by screwing the threaded portion of the threaded member onto the threaded portion to be attached, the flange ring contacts the object to be attached. By the assembly resistance of the constituent elements, they are integrated and rotate equivalently to a single screw member. Then, when the flange ring contacts the object to be mounted and the rotation of the screw member stops and enters the tightened state, the rotation of the operation ring is screw-fed by the ball rolling in the screw groove. The pressing force presses the flange ring via the restriction ring, and this pressing force serves as a tightening force for the object to be attached. Further, when the operation ring is rotated when the operation ring is screw-fed, the balls roll in the thread grooves, the frictional resistance becomes substantially zero, and the rotational force of the operation ring is effectively lost without loss. Can be transmitted to.

When removing the tightening screw, by rotating the operating ring in the opposite direction to the above, the pressing of the flange ring can be released by the operating ring and the tightening can be loosened. It can be removed as a screw member. Even when the operation ring is rotated in the reverse direction, the balls roll in the thread groove, so that there is no loss of rotational force. Further, when the load of the operation ring on the flange ring side is removed, the operation ring returns to the initial position with respect to the screw member by the biasing means.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the invention, the tightening screw reduces the frictional resistance between the operating ring and the regulating ring to substantially zero and rotates the operating ring. Power can be effectively transmitted to the flange ring without loss.

In the tightening screw according to the third aspect of the present invention, in addition to the operation of the first aspect of the invention, the position of the ball is secured by the retaining ring, and a smooth ball rolling can be obtained.

According to the fourth aspect of the present invention, in addition to the action of the first aspect of the invention, when the operating ring enters the tightened state, the pressure between the operating rings is also received by the moderation ring. The motion is stopped, and at this stop, relative rotation occurs between the operation ring and the moderation ring, and the moderation and moderation sound are generated by the slip between the uneven portion and the contact part. Confirm.

[0015]

According to the first aspect of the present invention, when the flange ring comes into contact with the tool to be attached, the rotation of the screw member is stopped and the tightened state is reached, the operation of the operation ring at the time of screw feeding is performed. As for the rotation of the ring, the balls roll in the thread groove, the frictional resistance becomes almost zero, and the rotating force of the operating ring can be effectively transmitted to the flange ring without loss, and even a small rotating force is strong. It can be fixed by tightening, and the manual operation force can sufficiently act as the tightening force.

According to the second aspect of the present invention,
In addition to the effect of the invention described in claim 1, since the frictional resistance between the operation ring and the restriction ring in the tightened state is made substantially zero by the thrust bearing, there is no loss of the rotational force at that portion, and It is possible to efficiently and effectively apply a small operation force such as manual operation as a tightening force.

According to the invention of claim 3 of the present invention,
In addition to the effect of the invention as set forth in claim 1, the balls of the retaining ring are arranged such that adjacent balls in the screw pitch direction of the screw groove are displaced from each other in the screw pitch direction so as to be spaced apart from each other. Can be made smaller than the diameter of, and the lead angle of the thread groove can be made smaller, which allows
Greater boosting of the operating force is obtained and effective tightening is obtained.

According to the invention of claim 4 of the present invention,
In addition to the effect of the invention described in claim 1, when the operation ring enters a tightened state, the relative rotation between the operation ring and the moderation ring causes the uneven portion and the contact portion to slip, and the moderation and the moderation sound. Occurs, and the tightening state can be confirmed with this moderation and moderation sound.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

The drawings show a tightening screw. In FIGS. 1 and 2, the tightening screw 10 is a generally cylindrical screw member 1.
1, a ring-shaped operation ring 12, a cylindrical holding ring 14 holding a ball 13, a disc-shaped moderation ring 15, a disc-shaped restriction ring 16, a disc-shaped dry metal 17, a ring-shaped flange ring Eighteen.

A collar portion 20 is provided on the end portion of the screw member 11 described above.
And an engaging hole 21 of a wrench is formed at a predetermined position on the outer side surface of the collar portion 20. A female screw 22 is formed on the shaft core of the screw member 11, and an arcuate thread groove 23 for rolling the ball 13 is formed on the shaft-shaped outer periphery of the collar 20. Further, on the outer side thereof, a spline groove 24 that fits with the above-mentioned restriction ring 16 and a ring groove 26 that locks the stop ring 25 are formed. In addition,
27 is an O-ring for sealing.

The above-mentioned operation ring 12 is a ring for inputting a turning force, and is fitted and inserted into the shaft-like outer peripheral portion of the above-mentioned screw member 11, a non-slip knurl 30 is formed on the outer peripheral surface, and an outer surface is formed. A recess 31 into which the collar portion 20 of the screw member 11 is fitted is formed to interpose the O-ring 27 described above, and the inner peripheral surface has the same screw pitch as the screw groove 23 described above, 13 is formed with an arcuate thread groove 32 for rolling, and the thrust bearing 3 is formed on the inner surface.
A concave portion 34 for accommodating 3 is formed, and the thrust bearing 33 accommodated therein contacts the side surface of the moderation ring 15 described above. Reference numeral 35 is a storage groove for a spring 36 described later. Further, the above-mentioned screw grooves 23 and 32 may have an ordinary triangular shape instead of an arc shape.

A plurality of the above-mentioned balls 13 are rotatably held by a holding ring 14 at predetermined intervals, and the balls 13 are adjacent balls 13 in the screw pitch direction.
The three are arranged so as not to overlap with each other in the screw pitch direction but at different positions so that the width of the screw pitch can be formed smaller than the diameter of the ball 13. The lead angles of the screw grooves 23 and 32 are set to be smaller than the lead angle of the female screw 22 of the screw member 11 described above. Further, if the lead angle is set to be less than 1.5 degrees, the looseness due to vibration will not occur. It is preferable because it does not exist.

As shown in FIG. 4, the operating ring 1 described above is also used.
The uneven portion 37 is formed on the inner peripheral surface of
Contact portions 38 formed at three positions on the outer peripheral portion of the moderation ring 15 are engaged with 7. The above-mentioned contact portion 38 has elasticity by being formed from the moderation ring 15 via a slender neck, and the elasticity causes the contact portion 38 to urge and contact the above-mentioned uneven portion 37, and to contact these uneven portions 37. When the contact part 38 and the contact part 38 rotate, the contact part 38 engages with the recess,
The operation ring 12 is rotated to generate a moderation sound and generate a moderation sound.

The storage groove 35 of the operation ring 12 has a stopper 39, and the stopper 39 regulates both ends of the spring 36 stored in the storage groove 35. As shown in FIG. 5, the regulating piece 40 formed on the regulating ring 16 is fitted in the intermediate portion of the spring 36, and when the tightening load of the operating ring 12 is removed, the operating ring 1 is removed.
2 is urged to return to the initial position.

The above-mentioned restriction ring 16 has a spline groove 41 formed on the inner peripheral surface thereof, and is fitted into the spline groove 24 of the screw member 11 described above, so that the screw member 11 is slightly moved in the axial direction. Is allowed, the screw member 11 is fitted in a state in which the rotation is blocked.

The disk-shaped dry metal 17 has its surface friction coefficient set to a predetermined value, and this value is rotated by the reaction of the rotary tool 42 by the screw grooves 23 and 32 of the operating ring 12. Transmit to a value that does not become too tight,
The value is set to slip for further rotation.

The aforementioned flange ring 18 is the screw member 11
It is fitted to the end of the spline groove 24 so as to be rotatable and slightly movable in the axial direction, and the outer surface thereof applies a pressing force for tightening to the rotary tool 42.

A male screw 44 for attachment is engraved on the shaft end of the drive shaft 43 of the electric tool, and the rotary tool 42 is inserted into this male screw 44 via the inner flange 45, and constructed as described above. Attach and fix with the tightening screw 10.

That is, the female screw 22 of the screw member 11 is screwed and attached to the male screw 44 of the drive shaft 43. In the state where the flange ring 18 is not in contact with the rotary tool 42, in other words, when the flange ring 18 is not loaded, the fastening screw 10 rotates integrally with the assembling load of each component. , Screwed like a single nut.

When the flange ring 18 comes into contact with the side surface of the rotary tool 42 and stops rotating, at the same time, the rotation of the screw member 11 also stops, and the tightened state is entered in this state. That is, when the operation ring 12 is further rotated in the tightening direction from this state, the ball 13 held by the holding ring 14 rolls in the screw groove 23.32, and the operation ring 12 is screw-fed. Moreover, since the rolling resistance of the balls 13 becomes substantially zero, the rotation of the operating ring 12 is effectively transmitted without loss of the operating force.

The screw feeding of the operation ring 12 is performed by pressing the moderation ring 15, the restriction ring 16 and the dry metal 17 via the thrust bearing 33 and further pressing the flange ring 18, thereby tightening and fixing the rotary tool 42. To do.

When the operation ring 12 enters the tightened state as described above, the restriction ring 16 does not rotate, so that the spring 36 is compressed in the tightening direction when the operation ring 12 rotates.

As described above, when the operation ring 12 is tightened, the movement amount of the operation ring 12 is within 0.5 mm in the axial direction, and the rotation angle can be set to about 90 degrees. Further, since the rotation of the operating ring 12 is effectively transmitted without loss of operating force as described above, strong tightening and fixing can be obtained with a small rotating force (operating force), and sufficient tightening can be obtained by manual operation. To be

Further, since the friction with the moderation ring 15 with respect to the rotation of the operation ring 12 becomes substantially zero due to the insertion of the thrust bearing 33, there is no loss of force in this portion and the rotation of the operation ring is more effective. Can be activated.

As described above, when the operation ring 12 is rotated from the tightened state, the moderation ring 15 is stopped by receiving the pressing force at this point, so that relative rotation with the operation ring 12 occurs. , The concave and convex portions 37 on the inner peripheral surface of the operation ring 12 pass over the contact portion 38 of the moderation ring 15 to rotate, and each time the operation ring 12 gets over, the moderation and its moderation sound are obtained. It is possible to confirm to the operator that it is in the tightened state by touching it.

The rotary tool 42 is fixed as described above, and when this rotary tool 42 is used, the reaction reaction force due to the resistance of its use is transmitted to the flange ring 18 to rotate it in the tightening direction. This reaction force rotation continues until the dry metal 17 slips,
It is transmitted to the moderation ring 15 via the regulation ring 16, and relative rotation in the tightening direction occurs between the moderation ring 15 and the operation ring 12, so that the mutual tightening force is increased and the increased tightening force is increased. By (re-tightening), more effective tightening can be obtained. However, when there is a reaction force rotation exceeding the setting of the friction coefficient of the dry metal 17, slip occurs between the dry metal 17 and the flange ring 18, so that overtightening is prevented.

The tightening screw 1 attached as described above.
When removing 0, the operation ring 12 is rotated in the loosening direction. Also in this rotation, while the flange ring 18 is in contact with the rotary tool 42, the screw feed of the operation ring 12 is performed by the screw grooves 23 and 32 and the ball 13. Further, this screw feed also has substantially zero frictional resistance due to the rolling of the balls 13, so that a small manual turning force can be effectively transmitted to loosen the tightening.

Further, when the tightening of the flange ring 18 is loosened, the tightening screw 10 integrally rotates due to the assembling resistance of each constituent element, and the operation ring 12 rotates to rotate the screw member 11. Then, the female screw 22 of the screw member 11 can be removed from the male screw 44 of the drive shaft 43.

Further, when the tightening load of the operation ring 12 is released, the operation ring 12 is returned to the initial tightening standby position with respect to the restriction ring 16 by the elastic force of the compressed spring 36.

According to the embodiment described above, the flange ring 1
8 comes into contact with the rotary tool 42, and when the screw member 11 stops rotating and enters a tightened state, the operation ring 12 is rotated when the operation ring 12 is screwed.
By rolling 32, the frictional resistance becomes substantially zero, and the rotational force of the operating ring 12 is effectively lost without loss.
Can be transmitted to, and even a small rotational force can be strongly tightened and fixed, and a manual operation force can be sufficiently exerted as a tightening force.

Further, since the frictional resistance between the operation ring 12 and the restriction ring 16 in the above-mentioned tightened state is made substantially zero by the thrust bearing 33, there is no loss of rotational force at that portion, and it is more efficient and effective for manual operation. It is possible to sufficiently apply such a small operating force as a tightening force.

Further, the distance between the balls 13 of the retaining ring 14 is set so that the adjacent balls 1 of the screw grooves 23.32 in the screw pitch direction.
Since the positions of 3 are displaced from each other in the screw pitch direction and are spaced apart from each other, the screw pitch of the screw grooves 23 and 32 is equal to that of the ball 13.
Can be made smaller, and the lead angles of the screw grooves 23, 32 can be made smaller, whereby a larger boosting of the operating force can be obtained and effective tightening can be obtained.

Further, when the operation ring 12 enters the tightened state, the relative rotation between the operation ring 12 and the moderation ring 15 causes the concave-convex portion 37 and the contact portion 38 to slip to generate a moderation and a moderation sound. , The tightening state can be confirmed with this moderation and moderation sound.

In the correspondence between the structure of the present invention and the above-described embodiment, the biasing means of the present invention corresponds to the restricting piece 40 and the spring 36 of the restricting ring 16 of the embodiment, but the structure of the present invention is not limited to this. It is not limited to the configuration of the above embodiment. For example, a male screw may be formed instead of the female screw 22 of the screw member 11.

[Brief description of drawings]

FIG. 1 is a sectional view of a tightening screw.

FIG. 2 is an exploded view of a section above the center line.

FIG. 3 is a development view in which a retaining ring is partially omitted.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a plan view of a moderation ring.

[Explanation of symbols]

 10 ... Tightening screw 11 ... Screw member 12 ... Operation ring 13 ... Ball 14 ... Retaining ring 15 ... Moderation ring 16 ... Restriction ring 18 ... Flange ring 23, 32 ... Thread groove 33 ... Thrust bearing 36 ... Spring 37 ... Uneven portion 38 … Contact part 40… Regulating piece

Claims (4)

[Claims] 1. A screw member having a female screw thread or a male screw thread to be screwed into a threaded portion to be mounted on a shaft core portion, and a shaft-shaped outer peripheral portion formed on an outer peripheral surface, and a shaft-shaped outer periphery of the screw member. The inner peripheral portion of the screw member is inserted into the outer peripheral portion of the screw member, and the operating ring for inputting a rotational force from the outside is opposed to the operating ring, and the shaft-shaped outer peripheral portion of the screw member is rotatable and allows a slight movement in the axial direction. And a flange ring that is in contact with an object to be attached. A restriction ring that is slightly movable in the axial direction with respect to the screw member and that prevents rotation is interposed between the operation ring and the flange ring. In the meantime, allow the rotation of the tightening range set with the above operation ring for the first time. Screw tightening, which is interposed a biasing means to return to the position. 2. The tightening screw according to claim 1, wherein a thrust bearing is interposed between the operation ring and the restriction ring. 3. The balls are held by a holding ring interposed between screw grooves of a screw member and an operation ring, and adjacent balls in the screw pitch direction are displaced from each other in the screw pitch direction and are spaced apart from each other. The tightening screw according to claim 1. 4. A thrust bearing is interposed between the operation ring and the restriction ring, and a moderation ring is interposed between the thrust bearing and the restriction ring. The moderation ring and the operation ring are mutually connected. 2. The tightening screw according to claim 1, wherein a concavo-convex portion is formed on one of the circumferences on the opposing surface of the, and a slippery contact portion is formed on the other surface while contacting the concavo-convex portion in a biased state.