RU2733853C2 - Method of wrapping of long-length screws for cross or straight splines in their heads and device for its implementation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to wrapping long-length screws in wooden articles. Hole is formed for a long screw by means of a device for formation of a hole in the form of a screwdriver and a long-length screw is wrapped into the hole for the head itself. Device for hole formation includes an analog screw having smaller length and identical thread pitch and diameter with long-length screw to be screwed into the product, holder bit with bit fixed in the screwdriver cartridge and hollow sleeve interacting with the bit holder. Hollow sleeve has a bottom with a hole into which the specified analogue screw is introduced until its head stops into the hole walls. Analog-type screw is made with the possibility of hard bit locking by its head between the bit holder and the sleeve bottom.

EFFECT: labor intensity of wrapping long-length screws is reduced.

5 cl, 2 dwg

Description

INTRODUCTION

The technical solution belongs to the field of mechanics, but can be used in house building production, in the repair of houses or even apartments, and is a means for wrapping long screws for a cross slot with a tapered recess, or a longitudinal shallow slot in the screw head, with a drilling machine (screwdriver) , when fastening wooden parts to each other or to supporting structures. The technology for wrapping such screws is not found in the literature, so you have to be content with rumors or recommendations of hardware dealers on the use of such screws. Some say that before wrapping such a screw, a hole is drilled in the wood to the full depth of the screw to be rolled, with a diameter of two or more millimeters, depending on the density of the wood and taking into account the diameter of the screw. Others argue that there is no need to drill a pre-hole. When the author of the application tried to wrap a screw 50 mm long, in a horizontal plane, at a distance of 20 cm from the ground, without preliminary drilling and without the opportunity to rest his back on something, the screw did not enter the wood until an auxiliary hole was drilled in the first of the slats ... What can we say about wrapping a screw with a length of 150 mm. For valley screws, the diameter of the unthreaded part of the screw is slightly greater than or equal to the diameter of the screw threads, and despite the fact that the length of the threaded part for screws of any length is approximately the same, the force of resistance to screwing in the screw increases as it deepens into the wood.

They say to me: "You did not choose the right bit on the screw slot." I haven't really done some experiments. But it was easier for me to invent my own way of wrapping long screws, and at the same time a device for its implementation, which I bring to your attention. According to them, I wrap the screw with any bit, so long as it fits into the slot of the screw, and its working blade is strong enough.

PURPOSE OF THE INVENTION

Simplifies the process of driving long screws, increases the strength of the connection of the fastened wooden parts and reduces the cost of associated tools.

EXAMPLES OF SPECIFIC PERFORMANCE

On figa) shows an example of a standard device - a bit holder. Here 1 is the bit itself with a hexagonal cross-section, 2 is a tubular bit holder with a hexagonal hole, 3 is a magnet for holding the bit when manipulating the holder. 4 - shank for pinching in the screwdriver chuck, 5 - screwdriver chuck.

Figure 1b) shows a modified bit holder 2, on which a thickening 6 with a thread is provided. The diameter of the thread is taken to be larger than the diameter of the head of the screw intended for tightening. Here, separately, a hollow sleeve 7 with a bottom and a hole in it is presented - an additional part of the modified device, with a thread on the inner surface of the sleeve, which is combined with the thread on the holder 2, A temporary screw 8 is inserted into the sleeve (the screw is a complete analogue of the one that will completely wrapped, one might say a master screw), with the head resting on the edges around the hole in the bottom of the sleeve. A master screw differs from a permanent screw only in length. It is 5 mm longer than usual, because these 5 mm immediately under the head are occupied by a part of the device. Sections A-A show the edges for holding and securely assembling the fixture, in the case of using wrenches, but you can get by with the assembly of the fixture with a screw, which is called "manually". Fig. 1 c) shows the assembled fixture, with the inclusion of a master screw 8, rigidly interlocked by parts of the fixture, by means of threads on these parts, which will form a "track" for a permanent screw.

Figure 2 shows a reinforced bit holder with an outer diameter greater than the diameter of the screw head intended to be screwed in completely, pin 9 is passed across the longitudinal axis of the holder, with ends protruding beyond the diameter of the bit holder - pins, that is, the total length of the pins is not less than sleeve outer diameter 7.

In this case, in the sleeve, under the trunnions of the bit holder 2, at least two shaped grooves are made from its diametrically opposite sides (view A), which makes it possible to quickly articulate and disconnect the bit holder 2 with the sleeve 7, the grooves of which are made with an inclination of their upper areas at a certain angle, for example 15 ... 30 degrees (surface. B). Thus, the bit holder assembled with the sleeve and the screw are rigidly closed together due to the pin and shaped grooves in the sleeve, and when a torque occurs when the screw is screwed in and due to the aforementioned inclination of these sections, it rigidly locks the screw head in the sleeve, the stronger the higher resistance to screwing.

In Fig 2a) the sleeve is shown with a side slot in the form of an open groove (section G-G), which allows, without completely opening the parts of the device, to accelerate the screw into the sleeve 7 with its head on the side, on page D, and at the same time ensure the centering of the screw due to a tapered recess in the remainder of the bottom under the screw head.

To reduce the load on the screwdriver, due to its increase when the screw is screwed in depth, it is possible to drill a preliminary hole only for the non-threaded part of the screw, slightly larger in diameter than the diameter of the unthreaded part of the screw. For example, if the diameter of the unthreaded part of the screw is 4 mm, the hole for this part can be made 4.5 mm.

TECHNICAL AND ECONOMIC EFFICIENCY OF THE INVENTION

It briefly boils down to the following.

1) There is no need to purchase drills in general, it is enough to purchase 2 ... 3 different-sized master screws, which do not break like drills, will be stored with a screwdriver and used as needed, to form channels for permanent screws of different sizes.

2) Higher labor productivity is achieved due to the absence of the need to drill a preliminary hole and with a higher speed of screwing in due to the absence of the risk of breaking the drill and due to the accelerated movement of the screw into the depth of the wood (approximately 3 ... 5 mm per screw revolution, depending from the size of the thread pitch).

3) There is no need for forceful action on the screw when screwing it in, which makes it possible to wrap screws in cramped conditions, without the possibility of resting their back on something, as well as for people with low physical capabilities.

4) There is no need to precisely match the bit along the slot of the screw.

5) Variants of various design solutions allow the use of various technologies for manufacturing devices for screwing screws, depending on the availability of equipment.

6) An increased strength of the connection of the elements is achieved, due to the compaction of the wood structure with the threads of the screw in the area around the screw, since its fibers are not prone to cutting, but only are subject to compaction.

7) Due to the rigid connection of the bit with the screw, when screwing it into the finished track, there is no need to produce screws with different-sized slots and with different sizes of the bit sting, it is enough to unify these parameters, which means that the equipment is simplified in terms of making bits, which can differ only in length.

Claims (5)

1. A method of wrapping long screws, mainly in wooden products, for cross or rectilinear slots in their heads, which consists in the fact that a hole is first made for a long screw, and then it is screwed into this hole, characterized in that a preliminary hole is made without removing shavings by wrapping into it with the help of an auxiliary device a complete analogue of such a screw, which will be wrapped completely, while the analogue screw is rigidly connected by means of a bit in its holder with a screwdriver chuck without the possibility of mutual removal of the bit from the screw being screwed, then this screw is unscrewed from the formed by it holes and a permanent screw is screwed into this hole under the very head, preferably of the same thread pitch and its diameter, but shorter in length and without using an auxiliary device. 2. A device for forming a hole for a long screwdriver screw by the method according to claim 1, containing a bit holder with the bit itself in this holder, fixed in a screwdriver chuck, while the bit holder is introduced into interaction with a hollow sleeve provided with a bottom and a hole in it, in which the analogue screw is inserted until it stops with its head into the walls of the hole in the bottom with the possibility of rigid locking of the analogue screw with a bit behind its head between the bit holder and the bottom of the sleeve. 3. The device according to claim 2, characterized in that the bottom of the sleeve and part of the wall of the sleeve are opened by a common groove to allow the analogue screw to be inserted into the groove of the sleeve from the side and to ensure that the analogue screw rests on the edge of the bottom of the sleeve opened by the groove. 4. The device according to claim. 2, characterized in that the bit holder is made with trunnions on its opposite sides, and in the walls of the sleeve there are corresponding shaped grooves for the trunnions, ensuring the said rigid closing of the bit holder with the sleeve. 5. The device according to claim. 2, characterized in that the bit holder and the sleeve are mated by means of a thread that provides said rigid closure of the bit holder with the sleeve.

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