JPH068154A - Nut for use with rotatably driven screwing device - Google Patents

Abstract

PURPOSE: To provide a nut for rotatingly driving type screwing device satisfying a high requirement with regard to stability while being lightweight. CONSTITUTION: This nut for rotatingly driving type screwing device for tightening or loosening a nut or screw nut comprises a headpiece 21 made of lightweight material having polygon-shaped driving surfaces for the nut or screw nut, and a coupling member 22 made of lightweight material having an engaging-ring contour part for driving; and the driving surface of the headpiece 21 is made of a hard material whose hardness and/or tensile strength is larger than that of the lightweight material. The engaging-ring contour part 27 of the coupling member 22 is also made of a hard material whose hardness and/or tensile strength is larger than that of the lightweight material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut for a rotary drive type screwing device for tightening or loosening a screw or a screw nut, and more particularly to a headpiece made of a lighter material than steel having a polygonal driving surface for the screw or the screw nut. And the polygonal drive surface is made of a hard material and is made of a lighter material that is lighter than steel and is provided with a connecting member having an engaging contour for driving.

[0002]

2. Description of the Related Art In order to apply a required tightening force to a screw or a screw nut, the screw or the screw nut is operated by a manual or electric screwing device having an output shaft, and the so-called nut cannot rotate with respect to the output shaft. And the nut is compatible with the head of a certain screw size or a drive element located circumferentially on the screw nut and is replaceable to match the respective screw size. The nuts known in the art are made of steel so that they can tolerate the high forces that occur when tightening or loosening screws or screw nuts without damage. However, such steel nuts are rather heavy, and their weight is much greater than the weight of the screwing device itself, which is cumbersome and unduly heavy in use. As a result, not only is it troublesome to handle, but it is burdensome to carry different sets of nuts of different sizes. The polygonal drive surface of the headpiece is the inner polygonal contour in the case of a box spanner, while it is the outer polygonal contour in the case of a socket wrench, which depends on the type of drive element of the screw head or screw nut, i.e. It depends on whether the drive element is located outside or inside. The most common polygonal contour is a hexagonal contour. Also, the shape of the nut connecting member varies depending on the output shaft of the screwing device,
The outer surface of the shaft or the inner surface of the sleeve may have a polygonal engagement surface, and the engagement surface may have a tooth shape with a small pitch.

[0003]

For the above-mentioned weight reasons, it is preferable that the nut is made of a material lighter than steel. However, such lightweight materials are, for example, only a fraction of the strength of steel and cannot withstand the forces acting on them when they are rotated under load. The polygonal driving surface is bent by the action of the polygonal contour of the screw head or the screw nut, and is deformed to the extent that it cannot be used. In the worst case, the nut will break.

The nut of US Pat. No. 2,651,230, which is made of steel, plastic material or other suitable metal, is
It has a headpiece with a polygonal drive surface,
An adapter made of tool steel or plastic material and removable from the headpiece may be fitted. The published specification does not include any suggestions or teachings regarding material combinations and other strategies for stabilizing the overall lightweight material nut. Also, the nut is not suitable for use in, for example, powered screwdrivers.

From WO 84/04721, a tool made of a fiber-reinforced plastic material is known, in which the drive surface is attached to a metal reinforcing element which surrounds the tool opening on the outer circumference and on the front surface with a contoured flange. Has been formed.
This stiffening element, called the "double-walled sleeve", is deep-drawn from sheet metal and pressed onto a plastic body. Since the plastic body and the reinforcing element are permanently interconnected, the reinforcing element cannot be used as a replaceable adapter. Since this assembly is a tool in which a handle is formed instead of a nut, there is no connecting member for driving.

[0006] It is an object of the present invention to provide a nut for a rotary drive type screwing device which is lightweight and satisfies high requirements regarding stability.

[0007]

According to the present invention, the above-mentioned object is to make the hard material of the driving surface of the headpiece have hardness and / or tensile strength greater than that of the light-weight material, and to engage the connecting members. The contour is also achieved by being made of a hard material having a hardness and / or a tensile strength higher than that of the lightweight material.

In particular, a nut having an armor body made of a hard material having a hardness and / or a tensile strength higher than that of a lightweight material in the engaging contour portion of the connecting member has the optimum strength for both small and large nuts, and is of the impact type. Also suitable for rotating tools.

It may be formed on a base of lightweight metal or plastic material, and the use of a lightweight material that is lighter than steel results in a significant weight savings over the nut, which is a very favorable weight for handling. The armor body made of hard material makes up for the lack of sufficient strength associated with the use of lightweight materials and forms a stabilizing wear portion, the weight of which is virtually invisible to the user of the tool. In high-speed screw-in devices, lightweight material nuts significantly reduce centrifugal mass, thus improving torque accuracy.

The hard material may be formed by an armor body that is non-rotatably provided on the head piece and the connecting member. The armor body may be press-fitted into the material of the headpiece and the connecting member, forming individual sections or closed ring shapes forming polygonal armor drive surfaces or engaging contours.
At the time of replacement, the armor body made of hard material is mechanically twisted or rotated to be removed and replaced with a new armor body. Alternatively,
It is also preferable to provide the armor body made of hard material in the form of a ring-shaped insert which is removable and held by fastening means. The fastening means may for example consist of at least one radial pin. The outer periphery of the ring-shaped insert has a polygonal contour and engages with the complementary contours of the headpiece or the connecting member to ensure torsional strength. The interchangeability of the hard material inserts not only increases the life time of the lightweight material nut, but also allows one nut size to be used for different widths between planes and different diameters of the drive shaft. This is because the hard material insert can have different internal dimensions or contours for the drive surface or engaging contours while keeping their outer dimensions consistent.

According to another embodiment of the invention, the drive surface and the engagement contour may be formed on an inner body made of a hard material surrounded by an outer body made of a lightweight material. Advantageously, the inner body made of hard material can be made of thin-walled steel, and the outer body is made of a plastic material that is wrapped around the inner body or molded. That is, preferably, the inner body is made of steel and the outer body sleeve is made of a carbon fiber material or a plastic material having a similar specific hardness.

Particularly in the case of a large nut, in order to prevent the nut from tearing and stabilize it, the outer side of the headpiece and / or the connecting member is made of a hard material having a hardness and / or a tensile strength higher than that of the lightweight material. Can be surrounded by. If the engagement contour of the connecting member is an inner contour, the engagement contour is armored by the hard material insert. If the engagement contour is the outer contour, it is itself made of a hard material. That is, reinforcement is also obtained at this force application portion of the nut. A lightweight material nut made of a lightweight material or a plastic material having a reinforcing portion made of two hard materials has sufficiently high durability and is suitable for an impact type rotating device.

The lightweight material may be composed of aluminum, aluminum alloy or high strength plastic material,
The hard material may also be a steel or plastic material that has greater hardness and / or tensile strength than a light weight material.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Four embodiments of the present invention will be described below with reference to the drawings schematically showing.

The socket nut 10 is made of a lightweight material such as aluminum or a plastic material, and is provided with a circular cylindrical head piece 11, to which a connecting member 12 made of the same material is firmly coupled, or preferably. Is formed integrally with it. In the illustrated embodiment,
The coupling member 12 is shown as a drive shaft with a toothed profile 13 along its circumference made of a hard material such as steel or similar high modulus wear resistant material and is removable to the output shaft of a rotary drive screwing device. A good connection. The head piece 11 is designed as a thick-walled box spanner, and has a circular cylindrical outer circumference and a hexagonal inner circumference. The hexagonal inner circumference has a receiving surface 17 for the mating insert 15.
And the insert 15 is made of a hard material such as steel or similar high modulus wear resistant material and functions as a stiffener for the headpiece 11 made of a lightweight material. The insert 15 has a hexagonal closed ring shape, the outer peripheral contour and the axial length of which substantially correspond to the receiving surface 17, and the hexagonal drive set on the screw head or screw nut to be tightened or loosened on its inner periphery. A surface 14 is provided. The insert 15 may later be press-fitted into the headpiece 11 or fixed with a suitable adhesive. Also,
The annular insert 15 or the individual insert elements that are combined to form each side of the drive surface may be pressed in at the same time when the headpiece 11 is molded. Furthermore, the insert 15 is removably arranged in the head piece 11 and has a different drive surface.
May be exchangeable with. In order to fix these replacement inserts 15, each insert may be detachably fixed using a pullable radial pin that penetrates the head piece 11 and projects into the insert 15 from the outside for a short distance.

The headpiece 11 is further reinforced by a circular ring 16, which is preferably made of the same hard material as the insert 15,
It is abuttingly mounted on the outer periphery of the inlet part of and can be fixed with at least one pin so as not to fall out. Ring 16
A band of hard material is formed that provides additional reinforcement to the nut 10.

The body nut 20 of the embodiment shown in FIG. 2 is also made of a lightweight material made of metal or plastic material. The nut 20 includes a head piece 21 in the form of a barrel sleeve and a connecting member 22 formed in the head piece 21 in the shape of a bush. These barrel sleeves and bushes have a cylindrical outer shape. The head piece 21 has internal teeth 23. The internal teeth 23 are
Forming a closed gear with axial projections and grooves. The inner teeth 23 also receive the corresponding outer gear 29 of an insert 25 or 25A made of a hard material with high elasticity and wear resistance, made of steel or plastic material. The inserts 25, 25A are formed as rings, which in the illustrated embodiment have different drive surfaces 24, 24A for screw heads or screw nuts, respectively. The driving surface 24 has a hexagonal shape, while the driving surface 24A has a quadrangular shape. Depending on the application, the inserts 25, 25A are pulled out from the head piece 21 and replaced. It is also possible to use various inserts with the same polygonal contour but different widths, so that the barrel nut 20 can be used for different widths between the planes.

On the circular cylindrical outer peripheral surface of the headpiece 21,
A circular tubular annular band 26 made of a hard material such as steel or similar high modulus wear resistant material is mounted and, if necessary, fixed as described in the embodiment of FIG. To be done.

A connecting member 22 having a square inner contour.
Includes an insert 27, which is made of the same hard material as the inserts 25 and 25A, and is formed into a rectangular ring shape which can be press-fitted into the connecting member 22 or detachably mounted. . An annular strap 28 made of a hard material similar to that described above has the same effect as the strap 26 of the headpiece 21 and when used in combination with a screwing device with or without impact action, the lightweight nut 20 I try not to cleave.
Inserts 25, 25A and 27 have radial holes 18
It can be fixed by a pin which can be inserted through and 19.

The barrel nut 40 of the embodiment shown in FIG.
A head piece 41 and a connecting member 42 are integrally formed from a lightweight material, in particular a plastic material such as carbon fiber material, and the connecting member 42 is formed as an inner sleeve made of a hard material such as steel or a similar high elastic wear resistant material. It is provided on the inner body 45. The lightweight material may be wrapped or molded around the inner body 45, for example. The inner body 45 forms in the front part a hexagonal drive surface 44 for a screw head or screw nut. Further, the inner body 45 is formed in, for example, a quadrangular shape in the portion of the connecting member 42, and forms an inner contour portion 47 made of a hard material for the connecting member. Both ends of the body nut 40 are reinforced from the outside by annular strips 46 and 48 made of a hard material having a hardness and / or a tensile strength higher than that of the lightweight material. These two hard material strips 46 and 48 may also be an integral sleeve 50, as indicated by the dashed lines in FIG.

FIG. 4 shows a nut 30 according to the fourth embodiment. In this example, a headpiece 3 made of a lightweight material
1 is a connecting member 32 attached to the drive shaft of the screwing device.
It is formed integrally with. Connection member 2 of the embodiment of FIG.
Similar to 2, the connecting member 32 can also be provided with a stiffening part of hard material, and can also be surrounded on the outside by an annular band 38 made of hard material.

Here, the head piece 31 is a circular cylindrical sleeve made of a lightweight material having a polygonal inner dead end opening 33 for non-rotatably receiving a part of the fitting socket pin 35 in the lengthwise direction. A length portion projecting outward of 35 has a polygonal outer driving surface 34. The socket pin 35 is made of a hard material having a hardness and / or a tensile strength higher than that of the lightweight material. The socket pin 35 may be fixed in the deadlock opening 33 of the headpiece 31, or a drive surface 34 of different shape or size.
It may be detachably attached so that it can be exchanged with another socket pin having.

The drive surface 34 of the socket pin 35 cooperates with the inner drive element of the screw head. An annular band 36 made of a hard material of the same type as described above is mounted on the lightweight material head piece 31 and fixed to the head piece.

[0024]

As described above, according to the present invention, it is possible to obtain a nut for a rotary drive type screwing device which is lightweight and satisfies high requirements regarding stability.

[Brief description of drawings]

FIG. 1 is a perspective view of a socket nut including an insert having an inner polygonal contour of a head piece and an outer metal band, and showing each component before assembly.

FIG. 2 is a perspective view of a barrel nut including at least two replaceable hard material inserts and a hard material insert having a polygonal profile of the connecting member.

FIG. 3 is a view of a barrel nut in which a polygonal inner driving surface is deformed and strengthened.

FIG. 4 is a perspective view of a nut including a socket pin.

[Explanation of symbols]

10; 20; 30; 40 ... Nut 11; 21; 31; 41 ... Headpiece 12; 22; 32; 42 ... Connecting member 13; 27; 47 ... Engaging contour portion 13; 15; 25, 25A; 27 ... Armor Body (or insert) 14; 24, 24A; 34; 44 ... Driving surface 16; 26, 28; 36, 38; 46, 48 ... Annular band 35 ... Socket pin 45 ... Inner body 50 ... Outer body (integral sleeve) )

Claims (10)

[Claims] 1. A nut for a rotary drive screwing device for tightening or loosening a screw or a screw nut, the headpiece (11; 21; 31) made of a lighter material than steel and having a polygonal driving surface for the screw or the screw nut. ; 4
1), wherein the polygonal drive surface is made of a hard material and further comprises a connecting member (12; 22; 32; 42) made of a lighter material than steel having an engaging contour for driving, The hard material of the drive surface of the headpiece (11; 21; 31; 41) has a higher hardness and / or a higher tensile strength than a light material, and the connecting member (12; 22; 32;
42) Nut, characterized in that also the engaging contours (13; 27; 47) of 42) are made of a hard material having a hardness and / or a tensile strength higher than that of the lightweight material. 2. The head material (1)
1; 21) and the armor body (13; 15; 25, 25A; 27) non-rotatably provided on the connecting member (12; 22)
The nut according to claim 1, wherein the nut is formed of: 3. The nut of claim 2, wherein the armor body of hard material is formed from individual sections. 4. An armor body (13; 15; 2) of the hard material.
Nut according to claim 2, characterized in that 5, 25A; 27) is in the form of a closed ring. 5. The nut according to claim 2, wherein the armor body made of hard material is press-fitted into the lightweight material or is fixed in the lightweight material by fixing means. 6. Armor body (15; 25, 2) of said hard material
Nut according to claim 2, characterized in that 5A; 27) is removable. 7. An inner body (45) made of a hard material, wherein the drive surface (44) and the engagement profile (47) extend from one end of the nut (40) to the other end and are circumferentially closed.
2. The inner body (45) is formed into a hollow body and is surrounded by an outer body (50) made of a lightweight material wrapped around or molded around the inner body (45). Nuts. . 8. The drive surface (34) is formed on a polygonal socket pin (35) made of a hard material having hardness and / or tensile strength higher than that of the lightweight material, and the socket pin is made of a lightweight material. Nut according to claim 1, characterized in that it is connected to (31). 9. The headpiece (11; 21; 31;
41) and / or said connecting member (22; 32; 42)
However, an annular band (16; 26, 28; 36, 3 made of a hard material having a hardness and / or a tensile strength higher than that of a lightweight material is used.
Nuts according to claim 1, characterized in that they are surrounded on the outside by 8; 46, 48). 10. The lightweight material is aluminum, an aluminum alloy or a high strength plastic material,
The nut according to claim 1, wherein the hard material is steel or plastic material having hardness and / or tensile strength higher than that of the lightweight material.