JPH01121180A - Box bit - Google Patents

Abstract

PURPOSE: To retain a fastening device surely with the pressure of an energizing member and feed or recover it without falling out, by fitting the energizing member for press-retaining the fastening device on the retaining part of a bit body. CONSTITUTION: By inserting a flanged nut 6 (a type of fastening device) into the engagement part 5a of a retaining part 3 in a bit body, an arm part 8b of a clamp spring (energizing member) 8 is pushed out outwards from the inscribed surface inside of the engagement part 5a with the nut 6. The reaction caused by this pushing-out permits the head part 6a of the flanged nut 6 to be pressed and retained by a pair of arm parts 8b of the spring 8. It is thus possible to prevent the flanged nut 6 from dropping off, apply the nut 6 to the screw shaft 9 surely, and screw and fasten it by the rotation of the bit body 1 even when the bit body of the box bit is directed downward in moving it to a prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a box bit, and more particularly to a box bit that prevents fasteners from falling off.

(Prior art) Box bits are used on assembly lines for various products, and are used to hold and supply fasteners to places where it is difficult to tighten the fasteners, and then tighten them at this location. ing.

In this box bit, for example, a holding part is formed on the bit body, and a fastener such as a nut or bolt is fitted into this holding part, and in this fitted state, the specified tightening is applied to the specified location. It is designed to tighten by rotating the bit body.

(Problem to be solved by the invention) However, depending on the location where the product is tightened on the assembly line, the box bit may face downward, and the fastener held by the box bit may fall during feeding. Sometimes.

For this reason, some bits have a magnet installed in the body of the bit, which attracts the fastener and holds it in the holding part. Sometimes you can't get the power. Further, if the fastener is made of a non-magnetic material, it may not be usable, and if it is held using a magnet, there is a risk that the magnetism may adversely affect the surroundings.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a box bit that has a simple mechanism, has a large holding force, and can be used with non-magnetic materials.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a box bit in which a fastener is fitted into a holding part of a bit body, and the fastener is tightened by rotation of the bit body. The bit body is characterized in that the holding portion of the bit body is provided with an urging member that presses and holds the fastener.

(Function) In the present invention, when the fastener is fitted into the holding portion of the bit body of the box bit, it is reliably held by the pressing force of the urging means. Then, the box bit is used to supply the fastener to a predetermined tightening location, and the box bit is rotated to tighten the fastener.

At this time, even if the pock bit is facing downward, the fastener is pressed and held by the biasing means, so it is held securely and will not fall off, and even non-magnetic fasteners can be held. .

(Example) Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of the box bit. Reference numeral 1 in the figure is a bit body of a box bit for a hexagonal nut, which is composed of a support rod part 2 and a holding part 3. The mounting portion 2a of the support rod portion 2 is connected to, for example, a chuck 4 of an electric motor, and is rotated by the electric motor.

A recess 5 is formed in the holding portion 3, and a fastener is fitted into this recess 4. This fastener is assumed to be a flanged nut 6 shown in FIG. 6, with a hexagonal head 6a and a washer 6b.
It is composed of.

The four parts 5 of the holding part 3 of the bit body 1 are flanged nuts 6
a hexagonal engaging portion 5a into which the head 6a of the
A relief hole 5b is formed at the back of this hole, and a tapered portion 5C is formed at the tip of the nut 6, with which the washer portion 6b of the flanged nut 6 comes into contact.

Grooves 7, 7 are formed in the portion of the holding portion 3 where the engaging portion 5a is formed, which reach the inscribed surface of the engaging portion 5a from symmetrical positions on the outer circumferential portion. This groove 7.7 is provided with a U-shaped clamp spring 8, which is a biasing means shown in FIG. This clamp spring 8 consists of a bent base 8a and arm parts 8b, 8b, and the arm parts ab, sb are connected to the groove 7,
7 in a state where they are biased toward each other. In this state, the side portions of the arm portions 8b, 8b protrude by a predetermined amount from the inscribed surface of the engaging portion 5a. The base portion 8a of the clamp spring 8 is in contact with the outer peripheral portion of the holding portion 3 where the grooves 7, 7 are not formed, and the tip of the arm portion 8b is bent inward to form hooks 8c, 8. This hook 8c,
Reference numeral 8c prevents the clamp spring 8 from being pulled out, and also allows the arm portions 8b and ab to expand outward.

For this reason, normally the arm portions 8b, 8 of the clamp spring 8
b projects inward from the inscribed surface of the engaging portion 5a of the holding portion 3, as shown in FIGS. 2 and 3. When the flanged nut 6 is inserted into the engaging portion 5a of the holding portion 3, the arm portions 8b, 8b of the clamp screw 8 are pushed outward from the inscribed surface as shown in FIG. The head 6a of the flanged nut 6 is pressed and held by the arm portions 8b, 8b.

Therefore, when the bit body 1 of the box bit is moved to a predetermined position, the flanged nut 6 will not fall even if it turns downward, and the flanged nut 6 can be securely applied to the screw shaft 9. be able to. When the bit body 1 of this box bit is rotated, the flanged nut 6 is screwed onto the threaded shaft 9 and tightened (FIG. 8).

After tightening, when the box-piece bit body 1 is pulled in the axial direction, the engaging portion 5a of the holding portion 3 resists the pressing force of the arm portion 8b of the clamp spring 8 and engages the head portion 6a of the unified screw 6.
come off from

Conversely, when removing the flanged nut 6 from the threaded shaft 9 to which the flanged nut 6 is tightened, loosen the flanged nut 6 using the bit body 1 of the box bit and remove it. At this time, the arm portion 8b of the clamp spring 8
, 8b press and hold the head 6a of the flanged nut 6, so that the flanged nut 6 can be easily recovered while being held in the bit body 1.

In this way, the head 6a of the flanged nut 6 is fitted into the engaging portion 5a of the holding portion 3 of the bit body 1, and is biased by the clamp spring 8, so that the holding force is large. Therefore, even if the holding portion 3 of the bit body 1 is turned sideways or downward, the flanged nut 6 will not fall off due to its own weight or vibration, improving work efficiency.

Furthermore, the box bit has a structure in which a groove 7.degree. 7 is provided in the bit body 1 and a clamp spring 8 is attached, so that it can be manufactured at low cost. Further, instead of the clamp spring 8, an elastic body may be provided in a part of the engaging portion 5a, and when the flange nut 6 is inserted, the elastic body may be used to press and hold the flange nut 6.

Furthermore, since the present invention does not use a magnet, magnetism does not adversely affect the surroundings, and the fastener can be used even when the fastener is a non-magnetic material.

Note that the fastener is not limited to a nut with a flange, but may be a nut or a bolt.

Further, the shape of the head is not limited to hexagonal, but may be square or elliptical, and the shape of the engaging portion of the holding portion 3 of the bit body 1 may be changed accordingly.

(Effects of the Invention) As explained above, in this invention, since the holding part of the bit body is provided with the biasing member that presses and holds the fastener, the fastener is reliably held by the pressing force of the biasing member. , and the structure is simple. In this way, the fastener is held by pressing force, so
It can be reliably supplied to or retrieved from a predetermined position, and the fasteners will not fall off during this process, improving work efficiency.

[Brief explanation of the drawing]

Figure 1 is a side view of the box bit, Figure 2 is a front view, Figure 3 is a sectional view of the bit body, Figure 4 is ■-rV of Figure 3.
5 is a plan view of the clamp spring, FIG. 6 is a perspective view of the flanged nut, FIG. 7 is a sectional view of the bit body with a hexagonal nut inserted, and FIG. 8 is a hexagonal nut. It is a figure showing tightening of a nut. In the figure, reference numeral 1 is a bit body, 2 is a supporting iron part, 3 is a holding part, 5 is an engaging part, 7 is a groove part, and 8 is a clamp spring.

Claims (1)

[Claims] In a box bit in which a fastener is fitted into a holding part of a bit body and the fastener is tightened by rotation of the bit body, an urging member is provided in the holding part of the bit body to press and hold the fastener. Box bit with.