KR100256625B1 - Screw driving unit for bit driver - Google Patents

Abstract

PURPOSE: An auxiliary screw connection device is provided to stably fix a flat head screw and to prevent wear and breakage of a cross recess of the flat head screw by combining an auxiliary screw connection device with a bit driver. CONSTITUTION: An auxiliary screw connection device(1) comprises a fixed tubular body(2), a flexible tubular body(3) and a slider(4). The fixed tubular body has a recessed sill and a ledge in its front end inner portion while tapered holes for inserting a ball are formed in its outer circumference. In the rear outer circumference of the fixed tubular body, an insert having a spring retaining recessed portion is formed. The flexible tubular body has an insert with a hanging protrusion in the rear end. The front end face of the flexible tubular body has a V-shaped groove while a deep cross recess incision groove is formed. A hole for inserting the front end of a bit driver(34) is formed in the flexible tubular body to make the front end of the bit driver slightly protrude into the front end face of the flexible tubular body. For fastening or unfastening a flat head screw(36), the cross recess groove is pressurized by the front end of the bit driver and is rotated. Then, the front end face of the flexible tubular body is planarized by moving backwardly while being adhered with the head of the flat head screw. As the front end of the bit driver and the front end face of the flexible tubular body are adhered with the flat head screw, a frictional area is enlarged. A hole is formed in a specific portion spacing apart from the incision groove of the flexible tubular body to insert a magnet(38) therein. The connection device prevents a groove of a screw from wear and breakage. As the magnet stably fixes a screw, fastening and unfastening of the screw are easy.

Description

Screwdrivers for Bit Drivers

The present invention is a screw driver for a bit driver for fastening or disassembling the screw head screw having a "+" shaped groove at the tip to fasten or disassemble the countersunk head screw having a "+" shaped groove Relates to a device.

As is well known, various machinery, furniture, instruments, home appliances, etc. Although there are many screwing parts and many kinds of screws throughout the industry, the most commonly used screws are screwed screws with “+” slots. I'm using a bit driver with a "+" character.

There are also several types of screws with “+” slots, including flat head screws with flat head surface, round head screws with round heads, and “+” on top of the screw rods without head. It is very diverse such as forming a groove.

However, when screwing or unscrewing screws with “+” slots formed into various shapes like these, a bit driver is used. It is inclined relatively sharply in shape, so that when it is inserted into the “+” slot to loosen or tighten the screw, there is only a relatively small amount of frictional connection. Therefore, when screwing the screw firmly or firmly When unscrewing the screw with a strong pressure, the driver's tip often rotates and the “+” slot is worn out or damaged, and the screw is worn or damaged. It was also very big.

The present invention has been invented to solve the conventional problems as described above, in particular, by combining a screw fastening device composed of a fixed tube, a telescopic tube, and a slider organically coupled to a conventional bit driver, countersunk screws, etc. It is an object of the present invention to prevent the case that the "+" type groove of the countersunk head wear and break accordingly, so as to be able to be very stable when fastening or disassembling.

1 is a cross-sectional view of the screwing aid of the present invention.

2 is a cross-sectional view showing a state of use of the present invention.

3 is an exploded perspective view of the present invention.

4 is a cross-sectional view showing an embodiment of the present invention.

5 is a cross-sectional view taken along the line A-A 'of FIG.

* Explanation of symbols for main parts of the drawings

1: Screw fastening aid 2,2a: Fixed tube

3: stretch body 4: slider

21: step recess 22: jaw

23 tapered hole 24 ball

25: spring mounting recess 31: hooking portion

32: insertion part 33: “+” type incision groove

34: Bit Driver 35: Hole

36: countersunk head screw 37: hole

38: magnet 41: reverse pressure release groove

41 ': Forward pressure release recess 42: Pressurized protrusion

43: spring seat 44: stopper

45: snap ring 46: compression spring

In constructing a screwdriver for a bit driver, the screwing aid 1 is composed of a fixed tube 2, a flexible tube 3, and a slider 4, wherein the fixed tube 2 is placed inside the tip. The stepped recess 21 and the locking jaw 23 are formed, and on the outer circumferential surface, four to six tapered holes 23 are formed so that the ball 24 is inserted therein, and the spring seating recess on the rear outer circumferential surface ( 25), the expansion and contraction tube (3) forms an insertion portion (32) having a locking portion (31) at the rear end, and the front end face is recessed. In the state where the groove is formed, the “+” type cutting groove 33 is formed relatively deep, and the tip of the bit driver 34 is inserted through the inside thereof. The hole 35 of the die is formed so that the tip of the bit driver penetrates the hole and slightly protrudes toward the distal end of the flexible tube 3, but when the plate head 36 is loosened or fastened, the tip of the plate 36 When pressing while turning the bit driver tip protruding into the tip end face of the extension pipe (3) to the "+" type groove formed in the groove, the tip end face of the extension pipe (3) is in close contact with the head of the countersunk head (36) to be flattened. The tip end of the bit driver and the end face of the expansion pipe (3) are in close contact with the countersunk screw to increase the frictional connection area.The hole 37 is formed by avoiding the cutout groove 33 of the end face of the expansion pipe (3). The magnet 38 is inserted into and fixed to the magnet 38.

In addition, the slider 4 is fitted to the outer circumferential surface of the fixed tubular body 2, which is the reverse pressure release recess 41 and the pressurizing protrusion 42 and the forward pressure release recess 41 'and the spring seating portion from the inner end. (43) and the stopper 44 and the snap ring 45 is installed in a sequential configuration, the stopper 44 is slidably rides on the outer peripheral surface of the fixed tubular body 2, the spring seating portion 43 and the spring seating recess 25 It is to be conveyed by a predetermined length before and after by the compression spring 46 is installed between.

4 and 5 have a configuration without the flexible tubular body 3, the fixed tubular body 2a is formed longer than the fixed tubular body described in FIGS. 1 to 3, and the outer peripheral surface of the front end portion is inserted into the slider 4. Formed larger than the portion to form a magnet insertion groove 26 in a circular shape at the tip thickness portion of the fixed tube (2a), and is formed by inserting and fixing a magnet 27 formed in the shape of a circular ring, the rest of the configuration described above It is the same as the fixed tube 2, and the slider 4 configuration is also as described above.

1 to 3 of the present invention configured as described above, the fixed tube (2), the elastic tube (3) and the slider (4) is organically composed with each other to smoothly loosen or tighten the "+" head screw You can do it.

In other words, when fastening or loosening the countersunk head screw 36 as shown in FIG. 2, the method of combining the screw fastening aid 1 of the present invention to the bit driver first is to move the slider 4 forward or backward. Insert the bit driver 34 into the fixed tube 2 while holding the pressure release recess 41 or 41 'at the position of the ball 24. [At this time, the recess formed in the bit driver 34 39 is in the position of the ball 24] When the slider 4 held in this state is released, the slider 4 is restored to its original position by the restoring force of the compression spring 46 and the pressing protrusion 42 C) is to block the top of the tapered hole (23) where the ball 24 is located is fixed to the screw fastening aid (1) of the present invention to the bit driver (34).

As described above, when the countersunk head screw 36 is fastened while the screw fastening aid 1 is fastened to the bit driver, the + -shaped groove of the countersunk head screw 36 is inserted into the bit driver tip. ) Cross section It is formed in a recessed shape, and since the magnet 38 is fitted, the countersunk screw 36 is stably attached to the distal end surface of the screw fastening assisting device 1 by magnetic force. The screwdriver is pressurized and rotated when tightening the screw or disassembling the screw, and the expansion and contraction body (3) is pushed back slightly on the inclined part of the screwdriver by the pressing force. As shown in FIG. 2, the contact surface of the countersunk screw and the bit driver is very wide, and thus the contact friction area between the countersunk screw and the bit driver is very wide, so that the fastening or disassembling is very stable.

Therefore, it is possible to prevent the “+” slot formed in the screw head from being worn or broken in the process of fastening or disassembling the countersunk screw. In addition, it is very quick and easy when loosening and tightening the countersunk screw. This will follow.

And round head screws other than countersunk screws are close to the center of the tip of the expansion pipe (3), so the contact friction area is narrower than that of the general bit driver. This wide and stable screwing and disassembly is possible.

4 to 5 show one embodiment of the present invention, which is a configuration without the flexible tubular body 3, and the fixed tubular body 2a is formed longer than the fixed tubular body 2 described in FIGS. And, by forming the step portion outer peripheral surface stepped to fix the magnet (27) formed like a circular ring, in this case is also very easy and simple to fasten or disassemble when tightening or loosening the plate head screw.

It is also possible to connect and use an air tool or a power drill in a state where the device of the present invention is fixed to the bit driver in which the present invention is installed.

The screwing assisting device 1 of the present invention shown in FIGS. 1 to 5 may be disassembled by a bit driver in some cases. In this case, the slider 4 is moved forward or backward to press the ball 24 at the position of the ball 24. With the release recess 41 or 41 'positioned, pull out from the bit driver.

As described above, according to the present invention, by attaching and using a conventional bit driver, the grooves of the screws are not worn or damaged when the countersunk head screw or the like is fastened or disassembled, and a magnet is provided at the end of the screw fastening aid 1. It is a very useful invention that the screw is securely attached to the end of the bit driver so that it can be conveniently used when tightening or loosening the screw.

Claims (2)

The fixed tube (2), expansion tube (3), the slider (4) is assembled to constitute a screw fastening aid (1), the fixed tube (2) is the stepped portion 21 and the locking step 22 inside the tip end; 4 to 6 tapered holes 23 are formed on the outer circumferential surface, and spring seating recesses 25 are formed on the rear outer circumferential surface. 31) to form the insertion portion 32 and the end surface is formed in the groove to form a recessed groove to form a deep "+" type cut groove 33, so that the tip of the bit driver 34 is inserted through the inside The tapered hole 35 is formed, and the magnet 38 is inserted and fixed by avoiding the incision groove 10 of the end face of the expansion and contraction tube 3, and the slider 4 has an internal pressure release recess 41 for the reverse side. ), The pressurizing protrusion 42, the forward pressure release recess 41 ', the spring seating portion 43, the stopper 44, and the snap ring 45 are sequentially installed and configured, Compression spring 46 is inserted between the spring seating recess 25 and the spring seating portion 43 of the main surface so that the slider 4 is moved forwards and backwards so that it can be coupled to or separated from a conventional bit driver. Screwing aid for bit drivers. The method according to claim 1, wherein after forming the fixed tube (2a), the magnetic insertion groove (28) is formed in a circular shape at the tip thickness portion, and the magnet (27) formed in the shape of a circular ring is inserted and fixed therein. Screwing aid for bit drivers.