JPS6232780Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a tightening device for screws, etc.

[Prior Art] Conventionally, particularly in power type screw tightening machines, various mechanical and electric types have been used to tighten tightening members (for example, bolts, nuts, screws, wood screws, etc.) with a constant tightening force. The following structure has been proposed.

[Problems to be solved by the invention] By the way, all of the previously proposed tightening devices for screws, etc. have complicated and expensive structures, and if the tightening operation is interrupted midway through, the additional load required for re-tightening becomes large. There were also many problems in handling, such as not being able to tighten them and causing them to fall apart.

The purpose of this invention is to provide a tightening device for screws, etc., which has a simple structure and is configured to always achieve a desired constant tightening no matter how the tightening method is used, in order to solve the above-mentioned problems.

[Means for Solving the Problems] In order to achieve the above object, in the tightening device according to this invention, a first member and a second member are provided in a hollow cylindrical body with their respective end surfaces in contact with each other, One member has one end coupled to the output shaft of the drive source, and the other end engages with the hollow cylindrical body to rotate the hollow cylindrical body while sliding in the axial direction, and the second member is connected to the hollow cylindrical body. The second member is housed in the body so as to rotate together with the first member and slide in response to the sliding of the first member, and a screwdriver portion is formed at the tip of the second member, and a screwdriver portion is formed between the hollow cylindrical body and the first member. A spring is provided therebetween, and the first member is configured to disengage from the hollow cylinder when the first member is slidably displaced relative to the hollow cylinder by a predetermined distance.

[Examples] This invention will be described below with reference to illustrated examples.

Figures 1 and 2 show a cross-sectional view of an embodiment of a tightening device for screws, etc. according to this invention.
is a first member, 2 is a second member, 3 is a hollow cylindrical body, 4
It is a spring. One end 5 of the first member 1 is connected to an output shaft (not shown) of a drive source, and the other end 6 of the first member 1 is slidably housed within the hollow cylindrical body 3, and FIG. As shown in an enlarged view, engagement grooves 7 are provided at diametrically opposed positions on the outer periphery, and these two engagement grooves 7 extend in the axial direction and communicate with the recess 8.

The second member 2 is housed within the hollow cylinder 3 so as to rotate therewith. In the illustrated embodiment, therefore, the second part 2 has a corresponding polygonal shaft section 10 which is passed through a polygonal bore 9 provided in the hollow cylinder 3.
, and one end 11 of the second member 2 is connected to the first member 1
The other end 12 is formed with a Phillips screwdriver. Note that the other end 12 can be formed with a minus screwdriver instead of the Phillips screwdriver, or can be configured in a shape that matches the structure of the tightening member to be tightened.
Further, two pins 13 that engage with respective engagement grooves 7 in the end portion 6 of the first member 1 are fixed to the hollow cylindrical body 3 at diametrically opposed positions. The spring 4 is attached around the first member 1 between a flange 14 provided on the first member 1 and an end surface of the hollow cylindrical body 3 .

The operation of the device according to the invention constructed as above will be explained.

First, consider the case of tightening wood screws, for example.
In the state shown in FIG. 1, when the first member 1 is rotated by the drive source by applying the screwdriver portion of the tip 12 of the second member 2 to the head of the wood screw, the entire device moves forward as the wood screw is screwed in. do. At this time, the first
A rotational force from a driving source is applied via the member 1, the hollow cylindrical body 3, and the second member 2. Hollow cylindrical body 3
When the tip of the first member 1 comes into contact with the surface of the member into which the wood screw is screwed, the first member 1 gradually slides inward in the axial direction of the hollow cylindrical body 3 and presses the second member 2. When the first member 1 further advances inside the hollow cylindrical body 3, the engagement groove 7 of the first member 1 is disengaged from the pin 13, and the first member 1 rotates idly, as shown in FIG. Therefore, the hollow cylindrical body 3 and the second member 2 stop, and the work of tightening the wood screws is completed. The device then returns to the state shown in FIG. 1 again under the action of the spring 4.

[Effects of the invention] As explained above, the device according to this invention has an extremely simple structure, can reduce manufacturing costs, and can retighten reliably even if the tightening work is interrupted midway. , which is highly usable.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views showing an embodiment of the tightening device for screws, etc., according to this invention, and Figure 3 is a longitudinal sectional view of the device for tightening screws, etc. according to this invention.
FIG. 2 is an enlarged plan view of a portion of the illustrated apparatus; In the figure, 1 is a first member, 2 is a second member, 3 is a hollow cylindrical body, and 4 is a spring.

Claims (1)

[Scope of utility model registration request] a first member whose one end is coupled to the output shaft of the drive source and whose other end is slidably housed within the hollow cylindrical body and engages with the hollow cylindrical body to rotate the hollow cylindrical body; The first member is accommodated so as to rotate therewith, and one end contacts the end surface of the other end of the first member and slides within the hollow cylindrical body in accordance with the sliding movement of the first member, forming a screwdriver portion at the other end. and a spring attached between the hollow cylindrical body and the first member, the first member and the hollow cylindrical body slidingly engaging each other over a predetermined axial distance. a sliding engagement portion; and an engagement that is located in connection with the sliding engagement portion and releases the mutual engagement when the first member and the hollow cylindrical body are mutually displaced along the sliding engagement portion; A tightening device for screws, etc., characterized by having a release part.