RU205729U1 - Screwdriver bit - Google Patents

Abstract

The utility model relates to a screwdriver bit for screwing and unscrewing a fastening element in the form of a threaded sleeve with a central hole and a slotted groove in the end surface. The screwdriver contains a cylindrical rod with a blade in the form of a plate of constant thickness, adjacent to the rod from the side of the working end, and a shank adjacent to the rod on the other side, while the blade is made with the possibility of contacting its surfaces with the mating surfaces of the slot of the fastening element. The lateral surfaces of the blade are a continuation of the cylindrical surface of the rod, and a rectangular retainer pin in the center adjoins the end surface of the blade, having a constant thickness and width, with a convex end surface, which is a continuation of the blade and forms, with its narrow sides, angular transitions of a rectangular shape in plan, and the lateral sides of the pin-retainer are made with a rounded radius of a circle described around them, while the diameter of the circle described around the lateral sides of the pin-retainer and the diameter of the hole of the fastening element are in the following relationship: d1 / d = 1.08-1.13, where d1 is the diameter of the hole of the fastener, d is the diameter of the circumscribed circle. The technical result consists in creating a special screwdriver bit, providing high accuracy of its basing (positioning) in the slotted groove of the fasteners. 1 wp f-ly, 4 dwg.

Description

The utility model relates to a hand-held fitting and assembly tool, namely to a special screwdriver bit for screwing and unscrewing fasteners, mainly in the form of threaded bushings with a central hole and a slotted groove in the end surface in places with limited access in general engineering products.

A screwdriver is known from the prior art (Patent for invention RU No. 2072909, IPC: B25 B 15/00, published in 1997) for screws with a straight slot, containing a rod, at least one of the ends of which is made working. The working end is made in the form of a protrusion with parallel working planes, mating surfaces of the screw slot and a length of 1.52 of the depth of the screw slot.

A screwdriver is known from the prior art (Patent for invention RU No. 1341014, IPC: B25 B 15/02, published in 1987) containing a rod with a handle at one end and a blade at the other. The thickness of the blade is made for interaction with the head of the fastening element cone-shaped protrusions with an apex angle facing the handle.

A BITS DIN3127 / ISO 2351 screwdriver bit for screws with a simple slot is known from the prior art (STAHLWILLE Catalog Program 2008/2009, p. 152), containing a cylindrical rod, one of the ends of which is made as a working one, which turns into a blade with parallel working planes, mating surfaces of the slot of the fastener and a hexagonal shank adjacent on the other side.

The closest in technical essence and the achieved results to the proposed technical solution is a special screwdriver nozzle (Patent RU No. 188583, IPC: B25 V 23/08, published in 2019), containing a rod with a blade from the side of the working end and a shank adjacent to the other side. The blade is made in the form of a plate of constant thickness, while on the side of the free end of the blade there is a profile groove of a trapezoidal shape in the plan, forming a central working section, the surfaces of which are in contact with the counter surfaces of the slot of the head of the fastening element, and its length L is selected from the condition:

L = 08h,

where h is the depth of the slot in the head of the fastener.

In this case, the lateral surfaces of the profile groove are identical to the lateral surface of the head of the fastening element.

The technical problem solved by the creation of this utility model consists in the low accuracy of the locating (positioning) of the tool in the spline groove of the fastening element such as a threaded bushing with a central hole, as well as in the high probability of damage to the threaded surface of the hole of the body part when screwing and unscrewing fasteners of this type.

The technical result, which the claimed technical solution is aimed at, consists in creating a special screwdriver nozzle, which ensures high accuracy of its positioning (positioning) in the slotted groove of fasteners, mainly in the form of threaded bushings with a central hole when screwing and unscrewing them, eliminating the possibility of damage to the threaded surface of the hole body parts.

The technical result is achieved in that the special screwdriver nozzle contains a rod with a blade in the form of a plate of constant thickness from the side of the working end and a shank adjacent on the other side, while the blade is made with the possibility of contacting its surfaces with the counter surfaces of the slot of the fastening element. At the same time, it differs from the prototype in that the lateral surfaces of the blade are a continuation of the cylindrical surface of the rod, and a rectangular retainer pin in the center adjoins the end surface of the blade in the plan, of constant thickness and width, with a convex end surface, which is a continuation of the blade and forms with its narrow sides are rectangular corners in plan. Moreover, the lateral sides of the retainer pin are made with a rounded radius of a circle described around them.

The essence of the utility model is illustrated by drawings, where:

fig. 1 - General view of a special screwdriver bit;

fig. 2 - view A of FIG. one;

fig. 3 - view B of Fig. 1 (enlarged);

fig. 4 is a general view of a fastening element in the form of a threaded sleeve with a central hole and a splined groove in the end surface.

The special screwdriver nozzle contains a rod 1 (Fig. 1, 2) of a cylindrical shape with a blade 2 (Fig. 1) from the side of the working end and a shank 3 (Fig. 1, 2), adjacent from the side of the opposite end to the rod 1.

The rod 1 in the lower part is made with two symmetrical bevels 4 (Fig. 2) with concave surfaces passing into the surfaces of the wide sides of the blade 2.

Blade 2 is made in the form of a plate of constant thickness S (Fig. 2) and height H (Fig. 1). The side surfaces 5 (Fig. 1-3) of the blade 2 are a continuation of the cylindrical surface of the rod 1 with a diameter D. In this case, the blade 2 is made with the possibility of contacting its surfaces with the mating surfaces of the slot of the fastening element (Fig. 4).

The height H of the blade 2, the diameter D of the rod 1 and the depth h (Fig. 4) of the slot of the fastening element are in the following relationship:

h <H <D,

where h is the depth of the slot of the fastener;

H is the height of the blade;

D is the diameter of the bar.

To the end surface 6 (Fig. 1, 3) of the blade 2 in the center adjoins a pin-retainer 7 (Fig. 2) of a rectangular shape in the plan, of constant thickness and width, visually separated from it along the wide sides and being its continuation, and with narrow sides forming corner transitions 8 (Fig. 1) rectangular in plan. In this case, the lateral sides 9 (Fig. 1, 3) of the pin-retainer 7 are made with a rounded radius of a circle with a diameter d described around them (Fig. 3). The end surface 10 (Fig. 2) of the latch pin 7 is made convex, for example, rounded.

The diameter d of the circle described around the lateral sides 9 of the retaining pin 7 and the diameter d _{1 of the} hole (Fig. 4) of the fastening element are in the following relationship:

d ₁ / d = 1.08 ... 1.13,

where d ₁ is the diameter of the hole of the fastener;

d is the diameter of the circumscribed circle.

The size of the diameter d excludes the movement of the side surfaces 5 of the blade 2 along the thread protrusions of the hole in the body part when screwing and unscrewing the fasteners, while the diameter D of the rod 1 of the screwdriver bit and the diameter D1 of the external thread (Fig. 4) of the fastening element are in the following relationship:

D <D1,

where D is the diameter of the screwdriver bit;

D1 is the diameter of the outer thread of the fastener.

Contacting the surfaces of the lateral sides 9 of the retainer pin 7 with the surface of the central hole of the fastening element, as well as making its end surface 10 convex, ensures the accuracy of its positioning (positioning) in the central hole of the fastening element, while ensuring the accuracy of the positioning (positioning) of the blade 2 of the rod 1 in the slotted groove of the fastener.

Shank 3 is made in the form of an elongated hexagon, for example, with an external size of 1/4 ", 5/16" in accordance with the DIN3127 / IS02351 standard form C6.3 or C8, which allows you to use various holders for bits like BITS or screwdrivers of the same size for installing the tool.

The length L of the rod 1 with the blade 2 and the locking pin 7 and the length L1 of the shank 3 (Fig. 1) can vary depending on the technological features of the special screwdriver bit.

They work with a special screwdriver bit as follows. The retaining pin 7 of the blade 2 enters the central hole of the fastening element, contacting the surfaces of the lateral sides 9 with the surface of this hole. In this case, the blade 2 of the rod 1 contacts its surfaces with the mating surfaces of the slotted groove of the fastening element. Thus, the fastening element is screwed or unscrewed, ensuring the accuracy of locating (positioning) the tool in places with limited access, excluding possible damage to the threaded surface of the hole of the body part.

Claims (5)

1. A screwdriver bit for screwing and unscrewing a fastener in the form of a threaded bushing with a central hole and a slotted groove in the end surface, containing a cylindrical rod with a blade in the form of a plate of constant thickness adjacent to the rod from the side of the working end, and a shank adjacent to the rod with on the other hand, in this case, the blade is made with the possibility of contacting its surfaces with the mating surfaces of the slot of the fastening element, characterized in that the lateral surfaces of the blade are a continuation of the cylindrical surface of the rod, and a pin-retainer of rectangular shape in the plan, having a constant thickness and width, with a convex end surface, which is a continuation of the blade and forms, with its narrow sides, angular transitions of a rectangular shape in plan, and the lateral sides of the retainer pin are made with a rounded radius of a circle described around them, while the diameter of the described wok The circle of the lateral sides of the circle retaining pin and the diameter of the hole of the fastener are in the following relationship d ₁ / d = 1.08-1.13, where d ₁ is the diameter of the hole of the fastener; d is the diameter of the circumscribed circle. 2. A screwdriver nozzle according to claim 1, characterized in that the end surface of the retainer pin is rounded.

Images