RU227988U1 - ANGLE GRINDER PROTECTIVE GUARD - Google Patents

Abstract

The utility model relates to a hand-held power tool, in particular to angle grinders, and can be used in the design of protective covers. The protective cover of an angle grinder consists of a cover with a groove covered by a clamp, made in the form of a bracket with bent ends. The ends are connected with the possibility of clamping by a screw connection. One end of the bracket contains a spring fixed to it. The retention of the protective cover in a given position on the body of the angle grinder during processing is ensured. 4 cl., 3 fig.

Description

The utility model relates to a hand-held power tool, namely to a hand-held type of grinding machine, and can be used in the design of protective covers for such machines.

A locking mechanism is known which consists of a protective cover, to the inner edge of which a metal strip is fixedly attached, framing the body of the grinding machine. Both ends of the metal strip are connected to each other by a screw connection. On the outer edge of the metal strip above the level of the body there are sector-arranged limiting teeth. The metal strip of the protective cover is pressed by a locking plate. Along its periphery, a limiting sector and an angular limiter are designed opposite each other. Their diameter exceeds the diameter of the metal strip. The locking plate is attached to the body of the grinding machine by means of screws. On the locking plate there is a limiting hole in which a pin is located, mounted on the body. The height of the limiting teeth exceeds the thickness of the locking plate (according to patent RU 77817, B24B 55/05, published 10.11.2008).

The disadvantage of the known solution is the rather labor-intensive process of installing (removing) the protective cover, associated with the need to install (remove) the fixing plate and tighten (loosen) the screw connection on the metal tape.

A hand-held electric tool with a rotating casing is known, having a casing from which a drive spindle for a disk with a protective casing protrudes, which is detachably connected to the casing and is intended to at least partially cover the disk. The casing is installed and secured using a clamp with a screw connection. To install the protective casing in the required rotation positions relative to the machine casing without using an auxiliary tool and to fix the protective casing in any rotation position, the clamp is secured on the clamp with the ability to rotate, and a manual locking mechanism is provided between the clamp and the casing (according to patent RU7311589, B24B 23/00, published 25.12.2007).

The disadvantage of the known solution is the complexity of the design and manufacture of the manual locking mechanism.

The closest technical solution is a hand grinding machine, which includes an elongated housing and an output shaft, projecting at a right angle to the axis of the housing for receiving a disc-shaped rotary clamping tool. The output shaft is surrounded by a cylindrical projection, on which a protective cover is fixed, protecting against rotation and axial displacement, and which serves to cover the clamping tool (disk) and can be attached to the projection with a ring-shaped tension clamp. The clamp has projections with sharp edges, which, when clamped, are held on the projection in a locking manner (according to patent DE10316182, B24B 55/05, published 28.10.2004).

The disadvantage of the prototype is that in order to install the protective cover and secure it in the desired position using a clamp, it is necessary to hold the protective cover in the desired position until it is secured by tightening the clamp.

The technical result of the proposed utility model consists in ensuring that the protective cover is held in the desired position on the body of the angle grinder before and after it is fixed using a screw connection, including during operation of the product.

The specified technical result is achieved in that the protective casing of the angle grinder (AG) consists of a cover with a groove, covered by a clamp, made in the form of a bracket with bent ends, the ends have openings to ensure the possibility of clamping the clamp with a screw connection, and is distinguished by the fact that one end of the bracket is equipped with a screw spring fixed to it, extending from the opening on the bent end of the clamp.

The specified groove in the lid can be either an almost closed hole with a small slit, or a semicircular recess.

In addition, the spring can be directed either towards the other end of the clamp (inside the product) or in the opposite direction (outside).

In addition, the connection of the end of the bracket to the edge (base) of the spring can be made using a welded connection.

In addition, the screw connection hole at the end of the clamp and the spring can be made coaxial.

In addition, the clamp can be fixed to a neck made on the cover around the groove.

In addition, the clamp can be made of metal tape.

The utility model is illustrated by drawings that depict a particular case of its implementation:

Fig. 1 - protective cover of the angle grinder, general view;

Fig. 2 - installation of the casing on the angle grinder;

Fig. 3 - Angle grinder with a protective casing.

The protective casing 1 of the angle grinder (Fig. 1) consists of a cover 2 with a groove 3. Around the groove 3 there is a neck 4, on which a clamp 5 is fixed, made in the form of a bracket 6. The ends 7 of the bracket 6 have holes. The image shows that the ends are connected by a screw connection 8 (through the holes) and have a spring 9. The screw connection 8, consisting of a screw 10 and a nut, occurs already during use of the product, while the product itself in the finished (patented) form has holes at the ends 7 and a spring 9 attached to one of the ends.

In the given figure 1, groove 3 in the cover has an open semicircular shape.

The said groove in the lid may be a nearly closed hole with a small slit (not shown in the figures).

If the lid is made from a very soft, elastic polymer, the groove can have a completely closed, round shape.

The cover together with the clamp in the finished single product in assembly form a closed opening tending to a round shape.

Application.

The protective casing 1 is installed on the cylindrical projection 12 of the angle grinder 11. To install the protective casing 1 on the angle grinder 11, it is necessary to remove or first loosen (or completely open) the threaded connection 8 and loosen the clamp 5 by moving the ends 7 of the bracket 6 apart. After this, the casing 1 is installed on the cylindrical angle grinder 11 so that the clamp 5 covers the cylindrical projection 12, and stop loosening the clamp 5. Then the casing 1 is precisely positioned in the desired position and finally fixed with the screw connection 8 (the screw axis is shown in position 10). The screw connection 8 is tightened with a nut, the spring 9 is compressed. Due to the elasticity of the spring 9, the casing 1 will be held on the cylindrical projection 12 during operation of the product, which is subject to vibration and impact loads.

If the spring faces outside the clamp (as shown in the drawings), it is pressed by the nut, if inside the clamp (not shown), it is pressed by the other end of the clamp.

It is advisable to attach the spring to the end of the bracket using welding, as this will ensure reliable fastening of the spring, and therefore ensure the fixation of the casing on the angle grinder.

The coaxial arrangement of the screw connection holes and the spring helps to keep the spring in place during operation of the device (which is subject to significant loads), since the spring (a compression-tension type coil spring) will be held by the screw rod (stud).

Fastening the clamp to the neck made on the cover ensures the strength of the connection between the clamp and the cover, and therefore the reliability of fastening the casing to the angle grinder.

It is advisable to make the clamp from a metal strip to ensure strength and the necessary elasticity for fixing the casing on the angle grinder.

Thus, the proposed technical solution ensures that the protective casing is held in the desired position on the angle grinder body until it is fixed using a screw connection, thereby achieving the stated technical result.

Claims (5)

1. A protective cover for an angle grinder, consisting of a cover with a groove, which is covered by a clamp fixed to the cover, made in the form of a bracket with bent ends, which are connected and have mating holes for clamping with a screw connection, characterized in that a helical spring is fixed to one end of the bracket, extending from the hole on the bent end of the clamp. 2. The casing according to item 1, characterized in that the connection of the end of the bracket with the end of the spring is made by means of a welded connection. 3. A casing according to item 1 or 2, characterized in that the hole for the screw connection and the spring are made coaxially. 4. A casing according to item 1 or 2, characterized in that the clamp is secured to a neck made on the cover around the groove. 5. A casing according to item 1 or 2, characterized in that the clamp is made of a metal strip.