Structure for prevention of safety element fastener fallout in cutter

FIELD: process engineering.

SUBSTANCE: invention relates to metal cutting. Cutting is performed by motor-drive disc saw, drive motor being mounted at the cutter body casing. Cutter comprises structure designed to prevent saw disc safety element fastener fallout, said fastener intended for locking the saw disc element relative to cutter body casing. Saw disc mount portion locating said saw relative to spindle is designed to output motor drive power and is protected by safety element. Safety element is retained by body casing so that said safety element displaces between protective position for disc saw mount portion protection and open position for opening of mount portion and is locked thereat by appropriate retainer. Said retainer is provided with element for prevention of retainer fallout from cutter body casing.

EFFECT: ruled out retainer fallout.

4 cl, 9 dwg

The technical field TO WHICH the INVENTION RELATES

The present invention relates to a structure to prevent loss to the fastening means of the protective element configured to protect the docking portion of the saw blade in a cutting machine having, for example, a disc grinder or a circular saw such as the saw blade or circular saw with welded inserts.

The LEVEL of TECHNOLOGY

For example, desktop cutting machine includes a table to position the material for cutting its top surface and the body of a cutting machine held above the table and movable up and down, and cutting is performed by moving the housing of the cutting machine is down, while the circular saw is rotated, so that the circular saw cuts into the material for cutting, which is attached to the desktop. Technology related to the cutting machine of this type is disclosed, for example, the following Patent document.

The body of the cutting machine includes a housing (casing saws) held so that it can move up and down relative to the table. The motor is mounted in the housing cover as a means of drive. The rotational output power of the motor is transmitted through the gear to the spindle, which is held in the housing cover. In case circular saw �prikreplyaet to the spindle by means of fixing saws, such as a nut. The front side of the mounting portion of the saw blade relative to the spindle (the mounting portion of the saw blade) protected (fenced) protective item, such as a protective plate. Typically, the protective element is held by a housing cover. A protective element that protects the front side of the mounting portion of the saw blade, prevents damage to the mounting hardware of the saw or unintentional weakening due to mutual interference with other products, etc.

On the contrary, the protective element is configured so that it can be removed from the front side of the installation portion of the saw blade, to ensure ease of servicing, such as removal of the saw blade from the spindle. Typically, the protective element is held by a housing cover in such condition that it can be rotated vertically between a protective position in which it protects the front side of the mounting portion of the saw blade, and a retracted position in which it opens. Thanks to the opening of the front side of the mounting portion of the saw blade installation and removal of the saw blade can be performed easily. Typically, the protective element is configured so that it is securely held in a protective position by the fastening screw, etc.

PATENT DOCUMENT prior art

Patent document 1: Japanese patent No. 3553267.

The ESSENCE �of SUBRAMANIA

The PROBLEM SOLVED by the INVENTION

However, the protective structure according to the prior art described above, if the fixing screw unintentionally weakened too much to move the protective element from its protective position to the open position, the fastening screw can be removed from the threaded hole of the casing of the housing. If the mounting screw is extracted, the operation of installing the protective element again after the service is completed, it becomes time-consuming, and, furthermore, if the extracted mounting screw was lost, this requires additional effort to search for the screw and in some cases, you have to find another mounting screw.

Accordingly, the aim of the present invention is to prevent accidental fall of fixing means such as fixing screws for fixing the protective element in the protective position so that you can enjoy the convenience of the operation of fixing the protective element concerning mainly protective provisions.

The WAY to SOLVE PROBLEMS

The above-described problem is solved by the invention described below.

According to the first embodiment of the invention in the design to prevent loss to a cutting machine configured to perform the operation of cutting by rotating circular saws an electric motor�yeol, mounted in the housing of the cutting machine, the installation portion of the saw blade to install on the spindle, configured to issue the rotational power of the motor, protected by the protective element and the protective element is held by a housing cover so that the protective element is movable between a protective position to protect the docking portion of the saw blade and an open position for opening the docking part and can be locked in the protective position by the fastening means and the fastening means element is provided to prevent loss from the casing of the housing.

According to the first embodiment, the fixing means for fixing the protective element in the protective position of the supplied element to prevent loss of the fastening means from the casing body, and thus no need for the effort to search for the fastening means or reinstalling it at the stage of fixing the protective element again in the protective position after the completion of the service relative to the mounting portion of the saw blade; in this respect, the operation of fixing the protective element can be performed quickly and easily, and therefore, the workability of the maintenance operation can be improved.

For example, as fastening means can Exec�to Lisovets mounting screw. The fastening screw can be screwed into the threaded hole of the casing body so that the protective element was installed in a protective position. By loosening the fixing screws of the protective element can be moved to the open position. Element to prevent loss of the fastening screw to prevent excessive weakening and removing of threaded holes so that its threaded part of the rod is always kept screwed into the threaded hole, and therefore the loss from the casing of the housing can be prevented. Thus, at the stage of fixing the protective element again in a defensive situation there is no need to use effort for a new installation of the threaded part of the rod fixing screw into the threaded hole, and the simple rotation of the fastening screw in the tightening direction to tighten the mounting screw to secure the protective element.

According to a second embodiment of the invention in a first embodiment of the invention the protective element is configured to be movable between a protective position and an open position when the protective element is moved up and down.

According to the second embodiment, the protective element is held by a housing cover can be rotated up and down using� supporting shaft. For example, you can perform this configuration, the protective element moves to the open position when it is rotated down, and the protective element moves into a protective position when he turns up. In the case where a flat plate (protective plate) is used as the protective element, the displacement between the protective position and the open position is achieved by rotation of the plate in the direction of the plane along the lateral surface of a casing of the housing.

According to a third embodiment of the invention in the first or second embodiments, the fallout from the housing of the casing is prevented by means of the installation of the leaf spring serving as an element to prevent deposition on the housing cover, and clutch fixing means with the plate spring.

According to a third embodiment of the invention, the fixing means loss can be prevented using simple and inexpensive configuration. A leaf spring mounted on the housing cover in the state in which it podpruzhinivajushchaja force acts in the direction of fixation of the fastening means (the direction of fixation of the protective element). Thus, when the fastening means is moved in the direction (the direction of the liberation of the fixed position�Oia protective element) opposite to the direction of commit actions against podpruzhinivajushchaja force of the leaf spring, the fixed state of the protective element in the protective position is released. With the configuration involving the passage of the fastening means against the action podpruzhinivajushchaja force of the leaf spring, the fastening means cannot be inadvertently excessively displaced in the direction opposite to the direction of fixation, so that the loss of the fastening means from the casing of the housing is prevented.

According to a fourth embodiment of the invention in the third embodiment, in the plate spring is made catch hole, and a mounting screw that serves as a fastening means, can not fall out of the casing body as a result of the stop of the head portion of the fastening screw to catch the hole.

In the fourth embodiment of the invention the head portion of the fastening screw is hooked in such a state that it enters the catch hole of the leaf spring and, thus, loss of the fastening screw from the threaded hole of the casing of the housing may further reliably be prevented.

BRIEF description of the DRAWINGS

Fig.1 is a side view of the entire table of a cutting machine having a structure to prevent loss for fixing CP�of DSTV according to the embodiment of the present invention.

Fig.2 is a front view of the casing of the housing showing a state in which the protective element is fixed in the protective position.

Fig.3 is a front view of the casing of the housing showing a state in which the protective element is moved to the open position.

Fig.4 is a horizontal section made according to line (IV)-(IV) in Fig.2, showing a state in which the fastening means is activated.

Fig.5 is a horizontal section showing a state in which the fastening means is weakened relative to the state shown in Fig.4.

Fig.6 is a side view of the fastening means element is provided to prevent loss in accordance with another variant implementation of the invention.

Fig.7 is a side view of the fastening means element is provided to prevent loss in accordance with another variant implementation of the invention.

Fig.8 is a front view of the casing body, provided with a protective element according to another variant implementation of the invention, showing a state in which the protective element is fixed in the protective position.

Fig.9 is a front view of the casing body, provided with a protective element according to another variant implementation of the invention, showing a state in which the fastening means is loosened, and the protective element is moved to open the floor�proposal.

Embodiments of the INVENTION

Now with reference to Fig.1-7 will be described embodiment of the present invention. Fig.1 shows the entire desktop cutting machine 1 as an example of the cutting machine. Desktop cutting machine 1 includes a table 2 for fixing the material W to be cut on its upper surface, a base 3 for supporting the table 2 with the possibility of horizontal rotation within a certain angular range, part 4 for holding the housing positioned in the rear part (left end part in Fig.1) of table 2 and the housing 10 of the cutting machine held above the table 2 part 4 for holding the housing. Fig.1, the user is to the right of the table cutting machine 1. On the front of the table 2, which is the side located closer to the user, are engaged part 2a, which may deter the user, and the locking mechanism 2b for positioning and securing the rotational position of the table 2, etc.

On the upper surface of the table 2 is the setting limiter 5 for the location of the material W to be cut in the direction of the plane of the table. Installation of the limiter 5 is fixed on the side of the base 3 and is attributed from the upper surface of the table with a small gap to allow horizontal rotation of the table 2. The material W to be cut, fix angle at�shielded installation flow limiter 5, is fixed relative to the upper surface of the table 2 clamping device which is not shown.

Part 4 for holding the housing includes a pair of left and right guide plates 6, 6, configured to hold the housing 10 of the cutting machine with the possibility of sliding in the horizontal direction with respect to the table 2, the rejected support mechanism 18 configured to reject the housing 10 of the cutting machine to the left or right when viewed from the user side (in the direction perpendicular to the plane of the sheet of Fig.1), and the lever 8 to hold the housing, configured to hold the housing 10 of the cutting machine in such a way that it can be rotated up and down. The housing 10 of the cutting machine is held with the possibility of sliding in forward and rearward directions along the plane of the table along the guide strips 6, 6. The direction of sliding of the housing 10 of the cutting machine on both rails slats 6.6 corresponds to the cutting direction. Typically, the cutting material W to be cut is carried out by sliding the housing 10 of the cutting machine from the right side to the left side in Fig.1.

The lever 8 to hold the housing has an L-shape, and the casing 11 of the housing 10 of the cutting machine is held at the distal end of a curved lever so that it can be rotated up and down through �Ala 9 swing of the body. The casing 11 of the housing covers the upper half of the circumference of the circular saw 12. Circular saw 12 rotates clockwise in Fig.1, as shown by the hollow arrow 12a, marked on the casing 11 of the housing. Circular saw 12 mounted on the spindle 13. The spindle 13 is rotatably held by the casing 11 of the housing and is rotated by an electric motor and gear reducer that is installed on the back side (not visible in Fig.1) the casing 11 of the housing. In the distal end portion of the spindle 13 extending in the casing 11 of the housing, is formed a threaded hole, and a mounting bolt with flange 13A is tightened in the threaded hole so that the circular saw 12 is fixed at the distal end of the spindle 13.

On the rear side of the casing 11 of the housing is a handle 14, which holds the user. When the user holds the handle 14 and presses a finger on the switch lever 15 hammer type, the motor is driven, and circular saw 12 is rotated. When the user holds the handle 14 and tilts the housing 10 of the cutting machine is down, rotating circular saw 12 can cut the material W to be cut.

The movable cover 16 is essentially covers the lower half of the circumference of the circular saw 12. The movable cover 16 is held by the protective element 20 with the possibility of vertical rotation with a supporting shaft 16, running parallel to the spindle 13. The protective element 20 is held by a casing 11 of the housing. Detailed description of the invention the protective element 20 will be given below.

The movable cover 16 is opened and closed in connection with the operation of the vertical rotation of the body 10 of the cutting machine. Between the movable cover 16 and the distal end part of the lever 8 is a connecting rod 17 to hold the housing. The rear end part (left end part in the figure) of the coupling rod 17 is connected to the distal end part of the lever 8 to hold the housing with possibility of vertical rotation with a support shaft 17a. Support shaft 17a is in a position which is offset from the shaft 9 of the swing body for some distance. In conjunction with the operation of the swing body 10 of the cutting machine connecting rod 17 vertically swinging around a support shaft 17a relative to the lever 8 to hold the housing. When the housing 10 of the cutting machine is tilted downward, the movable cover 16 is rotated counterclockwise in Fig.1 and is opened so that the range of the lower half of the circumference of the saw blade 12 is opened gradually. When the housing 10 of the cutting machine is trending upward, the movable cover 16 is rotated clockwise in Fig.1 and gradually closes. Fig.1 and Fig.2 shows a state in which the movable cover 16 for�Rita, while Fig.3 shows a state in which the movable cover 16 is open.

Fig.2 and Fig.3, the protective element 20 is shown in detail. The protective element 20 is formed as an essentially semi-circular flat panel and functions as a basis for holding the movable cover 16, as well as enclosing the panel that covers (protects) the installation portion of the saw blade 12 relative to the spindle 13. As shown in Fig.3, the front side (near side in Fig.3) of the casing 11 of the housing is formed semi-circular relief cut 11b for opening the docking portion on the front side. Relief neck 11b is closed by a protective element 20, which is a separate element. In this description, the position in which relief neck 11b is closed, as shown in Fig.2, referred to as the protective position of the protective element 20, and the position in which it is open, as shown in Fig.3, referred to as the open position of the protective element 20. Due to the fixation of the protective element 20 in the protective position of the center of rotation of the movable cover 16 (support shaft 21) essentially correspond to the center of rotation (spindle 13) of the saw blade 12.

The protective element 20 is mounted on the front side of the casing 11 of the housing. The protective element 20 is held by a casing 11 of the housing in such a state that its front side is able to rotate vertically p�and assistance supporting shaft 21. The rear end of the protective element 20 is formed tazapsidis cutout 20a and the locking protrusion 20b. In this embodiment, tazapsidis the notch 20a formed in a semicircular shape and opened up.

The fastening means 30 is installed on the front side of the casing 11 of the housing so that it meets siteplease the cutout 20a. Fig.4 and Fig.5 shows in detail the fastening means 30. As shown in this embodiment, as the fastening means 30 is used the hex bolt. The threaded portion 30a of the rod fixing means 30 is tightened in the threaded hole 11a, located on the front side of the casing 11 of the housing. On the head portion 30b of the fixing means 30 as a single unit with it made the flange portion 30c. When the protective element 20 is in the protective position, the threaded portion 30a of the rod fixing means 30 is included in siteplease the recess 20a of the protective element 20 from above.

As shown in Fig.4, when the fastening means 30 is tight in this inserted condition, the periphery siteplease recess 20a is sandwiched between the front surface (side surface) of the casing 11 of the housing and the flange part 30c of the mounting means 30 in such a way that the protective element 20 is fixed in the protective position. In addition, in screwed state of mounting the fry�STV 30 locking protrusion 20b of the protective element 20 cooperates with the flange part 30c of the mounting means 30 from above, and during this operation, the downward rotation (in open position) of the protective element 20 is limited, which also causes the fixation of the protective element 20 in a defensive position.

The head portion 30b of the fixing means 30 is siteplease the hole 31a of the leaf spring 31. Siteplease hole 31 is formed so that it has a diameter that permits the entry of the head portion 30b, but does not allow the passage through it of the flange portion 30c. A leaf spring 31 corresponds to one embodiment of the element to prevent loss to the fastening means defined by the claims, and functions to prevent loss of the fastening means 30 from the threaded holes 11a and, therefore, from the casing 11 of the housing.

Siteplease hole 31 formed on one end side of the leaf spring 31. The other end side of the leaf spring 31 attached to the front surface of the casing 11 of the housing attachment screw 32. Podpruzhinivajushchaja force of the leaf spring 31 acts in the direction of movement of the mounting means 30 in the tightening direction (upward in Fig.4 and 5) through the flange portion 30c. Thus, when loosening the fastening means 30 of the fastening tool 30 rotates in the direction of weakening against the action podpruzhinivajushchaja power plate snap�NY 31 (downward in Fig.4 and 5).

In addition, when the fastening means 30 is weakened to a certain extent, as shown in Fig.5, the head portion 30b is moved downward in the drawing. When the fastening means 30 is weakened and moved down the side of the distal end of the leaf spring 31 moves downward under the action of the flange portion 30c against podpruzhinivajushchaja force. When the distal end side of the leaf spring 31 is moved, the axis scalawags hole 31a is deflected relative to the head portion 30b of the fastening means 30 such that the head portion 30b of the fixing means 30 is hooked in the state of oblique seizure (stop) with tazapsidis hole 31a. Since further movement of the mounting means 30 in the direction of weakening is also limited so it stops (jams), loss of the fastening means 30 of the threaded hole 11a is prevented.

When the fastening means 30 is sufficiently weakened within the range that does not cause loss of fixing means 30, the flange portion 30c moves away from the peripheral edge part siteplease recesses 20a and is separated from the bottom side of the locking protrusion 20b so that the fixation of the protective element 20 on the side of the rotating distal end (facing the back) is released. Tazapsidis cutout 20a of the protective element 20 is formed open up,and, thus, if the condition of fixation of the fastening means 30 is released, the protective element 20 enters the state's ability rotation down (counterclockwise in the drawing). As shown in Fig.3, when the cover panel 20 is rotated downward around the supporting shaft 21, the mounting portion of the saw blade 12 (mounting bolt with flange 13A) relative to the spindle 13 and its periphery is opened on the front side. When the protective element 30 is moved to the open position, and a mounting portion of the saw blade is open thus, the maintenance operation such as replacement of the saw blade, can be easily performed due to the simplicity of grabbing a wrench fixing bolt 13. The maintenance operation is performed in a state in which the fastening means 30 is installed in the threaded hole 11a (a state in which the threaded portion 30a of the rod is partially screwed into the threaded hole 11a). Thus, when the protective element 20 is installed in the protective position again after completion of the maintenance operation, the operation of tightening the fastening means 30 can be performed quickly. In contrast, if the fixing screw that serves as a fastening means, unintentionally excessively weakened, causing the loss of the fastening screw from the threaded hole, as in the prior art, tre�described efforts to detect the mounting screw and install the screw back in the screw hole for fixing the protective element again in the protective position, and you need to find another mounting screw if mounting screw is lost. In this respect, in some cases, the operation of fixing the protective element can take a long time. According to this embodiment of the invention, since the loss of the fastening means 30 is prevented by the plate spring 31, there is no need to re-install the screw into the threaded hole or make efforts to find another mounting screws, and thus, the operation of fixing and, therefore, the operation maintenance of the protective element 20 can be performed quickly.

According to the design to prevent loss to the fastening means according to the embodiment of the invention, configured as described above, even if the fastening means 30 is weakened for moving the protective element 20 to the open position, the fastening means 30 cannot fall out of the threaded hole 11a due to unintentional loosening, as in the prior art, and therefore, the operation of tightening the fastening means 30 can be performed quickly when the protective element 20 is subsequently mounted again into the protective position, and in this respect, the maintenance operation installation parts circular saws can be performed efficiently.

In the above-described variant embodiment of the invention can �be made of various modifications. For example, although as fastening element has been specified the hex bolt can be used in other types of screws (bolts). Furthermore, in addition to screws as fastening means can be used connecting elements having other configurations, such as a detent or pin plug.

Although the protective element 20 rotatably held at its front side and is fixed on its back side in the configuration shown, also applies a reverse configuration, i.e. configuration, rotatably held on the rear side and fixed on the front side.

In addition, although in the illustrated configuration uses a leaf spring 31 as an element to prevent loss to the fastening means 30, for example, as shown in Fig.6, it is also possible to provide part 33b without thread, is formed through partial removal of the thread in the middle part of the threaded portion 33a of the rod fixing means 33, as an element to prevent loss. In addition, as shown, for example, Fig.7, it is possible to apply a configuration in which the distal end of the threaded portion 34a of the rod fixing means 34 is held to the inner surface of the casing 11 of the housing, and siteplease spring 34b mounted on the distal end of the protruding part of the�them, she acts in the transverse direction to prevent loss of screw holes 11a.

In addition, in the illustrated configuration, the protective element 20 rotates down to move to the open position, however, it is also possible to apply a configuration in which the protective element 20 is rotated upward (clockwise in Fig.2) to move to the open position. The protective element 40 having such a configuration shown in Fig.8 and Fig.9. The protective element 40 is also held on the front of the casing 11 of the housing in such a state that it can rotate up and down through a supporting shaft 41, and the protective element 20.

The protective element 40 is provided with tazapsidis neck 40a in the posterior part. Tazapsidis cutout 40a is designed so that it is open downwards, as opposed siteplease the cutout 20a. The fastening means 30 is located on the side of the casing 11 of the housing, corresponding siteplease the cutout 40a. The fastening means 30 cannot fall out of the casing 11 of the housing through the plate spring 31 as described above.

Fig.8 shows a state in which the protective element 40 is rotated downward and is mounted in a protective position. In this state tazapsidis cutout 40a is engaged with the fastening means 30 from the top so that the protective element 40 is fixed in the protective position. Fig.9 pok�over the state, in which the fastening means 30 is weakened, and the protective element 40 is tilted upward to the open position.

Thus, in the case of the configuration in which the protective element 40 is rotated upward to move to the open position, even if the fastening means 30 is weakened, the protective element 40 cannot be rotated down from its protective position, as tazapsidis cutout 40a engages with him on top so that the portion corresponding to stoparea the protrusion 20b of the protective element 20 can be deleted.

Although in the illustrated configuration, the movable cover 16 is rotatably held by a protective element 20, the movable cover 16 may rotatably hold the other part, and the same configuration can be applied in the same way for a cutting machine, having a movable cover. The movable cover is not retained as described above, the protective element 40. Thus, the configuration of fixing the protective element 40 in the protective position shown fastening means 30 can be applied to a cutting machine, having a movable cover of this type, such as a cutting machine having a grinding wheel as the disc tool.

REFERENCE POSITION

1 - desktop cutting machine;

2 - table 2a - engaged part, 2b - locking mechanism;

3 - base;

4 - frequent� for holding the housing;

5 - installation of the limiter;

6 - guide bar;

8 - lever for holding the housing;

9 - the swing shaft of the housing;

W - material for cutting;

10 - the case of the cutting machine;

11 - housing cover; 11a - threaded hole;

12 - circular saw;

13 - spindle; 13a - mounting bolt;

14 - crank;

15 is a toggle switch;

16 - movable cover; 16a - support shaft;

17 - connecting rod; 17a - support shaft;

20 - protective element; 20a - tazapsidis neckline; 20b - locking ledge;

21 - support shaft;

30 - fastening means (fastening bolt);

30a - threaded portion of the rod; 30b - head part; 30c-flange part;

31 is a leaf spring; 31a - siteplease hole;

32 - screw set;

33, 34 to the fixing means (fixing screw);

33a, 34a - threaded portion of the rod; 33b - part without thread; 34b - shareplease spring;

40 - protective element; 40a - tazapsidis neck.

1. The cutting machine is designed to perform the operation of cutting through the rotation of the saw blade motor mounted on the housing of the cutting machine containing an installation part for installing the saw blade relative to the spindle that is used for issuing the rotational power of the motor, and a protective element held by the housing cover with the possibility of moving casinoroulette between a protective position to protect the docking portion of the saw blade and an open position for opening of the installation part, and fixing means for fixing the protective element in the protective position, wherein the locking means is provided with a element to prevent the locking means from the casing of the housing of the cutting machine is in said open and protective provisions.

2. The cutting machine according to claim 1, wherein the protective element is configured to be movable between a protective position and an open position when it is turned up and down.

3. The cutting machine according to claim 1 or 2, in which the loss of the locking means from the casing of the housing is prevented by means of the installation of the leaf spring serving as an element to prevent deposition on the housing cover and clutch fixing means with the plate spring.

4. The cutting machine according to claim 3, wherein the plate spring is formed siteplease hole, and the locking screw that serves as a fixing agent, will not fall out of the casing body as a result of the stop of the head portion of the locking screw in siteplease hole.