EP3517259B1 - Firewood tilting circular saw with automatic locking safety cover - Google Patents

Description

The invention relates to a tilting saw according to the preamble of claim 1.

THE TECHNICAL BACKGROUND

Tilting saws are usually used to cut longer objects to length. The cuttings here are often logs from which firewood that can be used in the oven is to be made. Because of this, such tilting saws are characterized by the fact that they are typically used over long periods of time and at high speed, since corresponding quantities have to be processed.

Such seesaws consist of a seesaw that takes up the logs, for example. The rocker can be swiveled against the saw blade, which means that the saw organ cuts the logs in the rocker. It is the same with other clippings.

Such seesaws are relatively dangerous as long as the operator with loose clothing, hair or his extremities can get into the area of the seesaw that picks up the firewood. This is particularly so because over the long working hours already mentioned, concentration decreases over time.

In addition, the operator initially believes he is deceptively safe, since the running saw blade cannot be seen when the rocker is in its rest position. As soon as you swivel the rocker a little towards the saw blade, it kicks in The saw blade suddenly cuts through a narrow slot in the area of the rocker mount and cuts everything within its reach. This suddenly creates the risk of injury.

One of the various typical dangerous situations arises from the fact that the cut material initially comes to lie unfavorably in the receptacle of the rocker and the operator wants to position it even better. If he hits the rocker and inadvertently causes it to swivel, there is a high risk of injury from the entering saw blade.

Because of this, it is necessary to provide such tilting saws with a safety cover and to ensure that the tilting saw can only be operated when the safety cover is closed.

A solution to this problem is already provided by the European patent EP 1 992 461 B1 suggested. This solution consists in providing the protective hood for the saw blade with a long protrusion that protrudes towards the front towards the rocker. This inevitably pushes the safety flap shut as soon as the rocker is set in motion in the direction of the saw blade.

However, there is at least a not inconsiderable risk of abuse from this concept. For an operator who is interested in fast work, it makes sense to save the handle of closing the safety flap and instead let the safety flap close again through the protective hood with each cutting process. Other hazards can also arise with this construction.

The EP 2 390 071 A1 discloses a seesaw according to the preamble of claim 1.

THE TASK ON WHICH THE INVENTION IS BASED

Because of this, the invention is based on the object of creating an alternative rocker saw in which the rocker can only be moved when the operator has willfully closed a protective cover in the appropriate manner.

THE SOLUTION ACCORDING TO THE INVENTION

This problem is solved with the features of claim 1.

A tilting saw with a saw element is proposed. The sawing element can theoretically be a saw band or an up and down cutting edge. The saw member is preferably a rotating saw blade that realizes a circular saw.

The rocker of the seesaw can be pivoted between a rest position and at least one, mostly diverse, cutting positions. In each cutting position, the saw member protrudes at least partially into a channel-like receptacle of the rocker in which the cut material is located.

A channel-like receptacle in this sense is characterized by the fact that it is bordered on at least three sides by walls, in the form of a floor-forming surface and two surfaces-forming side walls. The areas in question do not have to be complete be self-contained, they can also form locally or completely sufficiently small grid-like structures or the like.

A movable safety cover is provided on the seesaw, preferably in the form of a safety flap. In its closed position, the safety cover closes the loading opening of the channel-like receptacle at least partially in the vicinity of the saw blade, but preferably completely. The loading opening is generally the opening opposite the bottom-forming surface. In their open position, i.e. H. when the safety cover is pivoted into the open position or completely removed, it releases the loading opening of the channel-like receptacle for the purpose of loading clippings, which can then be inserted into the channel-like receptacle from above.

In this case, a safety lock is provided which comprises a latch which is formed separately from the safety cover - preferably in a translatory manner - relative to the base frame, relative to the protective hood of the saw blade and, as a rule, also relative to the rocker itself.

This blocks the rocker when the safety cover is fully or at least so far open that there is a risk. The rocker can then not be swiveled in the direction of the saw blade. The saw blade is therefore not able to enter the inner area of the channel-like receptacle, but rather remains completely in the area closed off by its protective hood. So there is no danger.

The bolt releases the rocker as soon as the safety cover is at least substantially closed. This release usually takes place by moving the bolt relative to the rocker.

The safety lock preferably comprises a sensing element which senses whether the safety cover is closed. This scanning is preferably mechanical in nature. Such a mechanical scanning is particularly safe, since it also works reliably if, for example, the power has failed and is unexpectedly available again. Because it must be prevented under all circumstances that in such a situation the rocker has been swiveled onto the saw blade, which is still stationary, and then the saw blade suddenly starts moving unexpectedly when the current returns. In principle, however, the scanning can also take place without contact, for example by means of a reed contact that electrically actuates a corresponding safety lock.

Said touch element ensures that the safety lock only releases the rocker when the safety cover is essentially closed.

PREFERRED FURTHER DEVELOPMENT OPTIONS FOR THE INVENTION

As already mentioned, the tactile organ is ideally a mechanical tactile organ. It is actuated by the safety cover in that it acts on the feeler element, preferably pressing it, as soon as the safety cover is in its closed position. The sensing element can be a rod, but in principle it can also be a movable bolt that is coupled, for example, to a Bowden cable and in this way and Way transmits a mechanical signal to another part of the safety lock.

The safety lock preferably comprises at least one gate which has a free area within which the locking member can move back and forth unhindered when the rocker is pivoted. In addition, the safety lock preferably comprises a latching area into which the locking member can latch in a form-fitting manner in order to block the rocker. A setting designed in this way can be operated mechanically extremely reliably with the aid of a rod or the said Bowden cable.

Ideally, the backdrop is designed as a plate or metal plate. The free area and the latching area are then ideally designed as corresponding openings which usually go completely through the plate. A plate is understood here to be a structure that has two large main surfaces, each of which has at least one surface that is eight times larger than the associated side surfaces. The free area is preferably laterally limited in such a way that it has at least one reveal which forms a sliding surface in the form of a circular path.

The longer the free area to be realized in it, the larger the backdrop. Because of this, it is particularly advantageous if the backdrop is attached in a stationary manner relative to the base frame in the vicinity of the pivot axis of the rocker. This close range is preferably defined by an imaginary cylinder, the radius of which is a maximum of 20 cm or, better still, only 15 cm and the central longitudinal axis of which is identical to the pivot axis of the rocker. A backdrop in this area must provide only relatively short paths for the locking projection protruding into it. It should be said that the backdrop is preferably in the lowest, ground-level quarter of the base frame, calculated in relation to its total height. Further design options, modes of operation and advantages emerge from the following description of the exemplary embodiments.

OTHER PROTECTIVE ITEMS

The safety lock preferably comprises a bolt which is designed for the saw blade and which is movable in translation and which is designed separately from the safety cover and without involving the protective hood. This blocks the rocker as long as it cannot be safely swiveled in the direction of the saw element. He releases the rocker as soon as it can be swiveled safely, for example because the user is holding both hands on the rocker.

The rocker preferably has a hold-down device which can be pivoted through the fixed side wall of the channel-like receptacle facing the operator into the channel-like receptacle.

FIGURE LIST

• The Figure 1 shows an overall view of the tilting saw according to the invention obliquely from the rear above.
• The Figure 2 shows an embodiment of the safety lock according to the invention, which is described below as a second embodiment.
• The Figure 3 shows a side view of the tilting saw according to Figure 1 , partly shown in glass condition.
• The Figure 4 shows the detail A. Figure 3 .
• The Figure 5 shows the detail B. Figure 3 .
• The Figure 6 shows a further embodiment of the safety lock according to the invention with the safety cover open, the rocker meanwhile being in its rest position.
• The Figure 6a shows a detail of a slight modification of the construction according to. Fig. 6 .
• The Figure 6b FIG. 11 is an enlarged rear view of a portion focused on the latch 21 of FIG Figure 6a .
• The Figure 7 shows the embodiment according to Figure 6 with the safety cover just completely closed, before starting to pivot the rocker in the direction of the saw blade.
• The Fig. 8 shows the from Fig. 3 shown hold-down device in detail.
• The Fig. 9 shows a side view of the tilting saw partially shown in the glass state, it is a third embodiment in which the locking of the Safety cover 13 is configured differently in its closed position.
• The Fig. 10 shows the detail B from the Fig. 9 , seen in the direction of the from Fig. 10 arrow.
• The Fig. 11 shows the detail A from Fig. 9 .

EXEMPLARY EMBODIMENTS OVERVIEW

The best overview of an embodiment according to the invention is given by Figure 1 .

The tilting saw 1 can be clearly seen here. It has a base frame 2, which preferably consists of a trestle-like frame, the legs of which, including the cross strut connecting them, can have the shape of an A open at the bottom in pairs. A motor 3 is preferably mounted on the base frame. This drives a saw organ. The saw member is usually attached directly to its shaft. Instead of the motor, there can also be a device for coupling a rotating shaft, for example a machine drive shaft in the form of a shaft that comes from a tractor, or some other transmission.

The saw member 4 preferably has the shape of a rotating disk and then forms the saw blade of a circular saw, compare Figure 3 .

Wherever it is not intended to cut, this saw blade is covered by a protective hood 5, which is stationary relative to the base frame 2, at least during operation. Where the saw blade is covered in this way, there is no danger from it.

In addition to the base frame 2, a so-called rocker 6 is provided. The rocker 6 can be pivoted about an axis 7. As a rule, the axis is arranged essentially horizontally. It is carried by the base frame 2.

How to use the Figure 1 sees, a support 8 is preferably provided pivotably about the same axis 7. The support 8 can ideally be locked in its operating position with the aid of a blocking device 9. The support 8 prevents the tilting saw from tipping towards the operator when the rocker is fully loaded with clippings.

The base frame 2 is preferably additionally provided with at least one pair of wheels in order to be able to easily bring the tilting saw 1 to its place of use. However, this is not shown figuratively.

As can be seen, the rocker generally consists of at least one rocker frame 10.

The main elements of this rocker frame 10 are preferably metal pipes. These metal pipes can be welded together. They preferably form a U that is open at the bottom. This U is penetrated by the axis 7 at its lowest end. This will keep it pivotable.

The metal tubes forming the rocker frame are preferably additionally planked, as a rule with one or more metal sheets.

In addition, the rocker has other elements so that it can be used in Figure 1 easily recognizable, channel-like receptacle 11 forms for the material to be cut. The side of the channel-like receptacle facing the saw blade has a slot. The saw blade passes through this as soon as the rocker is pivoted in the direction of the saw blade.

The channel-like receptacle 11 is provided for at least one, but preferably several sections, for. B. to be able to record a tree trunk side by side, as is indicated here with the part that bears the reference symbol BS. The channel-like receptacle 11 is loaded from above, as can be seen in this figure.

The channel-like receptacle 11 can be open on both of its end faces located to the left and right of the saw blade. In any case, this applies when these end faces are far enough away from the area in which the saw blade works in the groove to ensure that the operator cannot reach the area of the saw blade with a part of his body. In the case of particularly safe devices, these end faces are also closed, for example with the aid of a sheet metal. Otherwise, it applies that the safety cover covers the channel-like receptacle from above, at least in the vicinity of the saw blade, from above, but preferably over its entire width.

As can be seen, a safety cover 13 is also provided. This safety cover 13 can be completely removable Be lid. Ideally, however, it is a safety flap. This is attached to the rocker 6 so as to be pivotable about an axis. It is particularly favorable if the axis is formed on the side of the rocker that is directly adjacent to the saw blade. The axis is optimally positioned so that it is essentially horizontal.

In Figure 1 the safety cover 13, which is designed as a flap, can be seen in the completely pivoted-open state. In this way, the channel-like receptacle can easily be loaded with the clippings from above. The safety cover 13, designed as a flap, can be pivoted in the direction of the arrow P. In its closed position, it completely covers the loading opening of the channel-like receptacle 11. This eliminates the risk that the operator can get into the area of the saw blade with his hands or hair or loose clothing.

In order to prevent the operator from starting to work, pivoting the rocker in the direction of the saw blade and then opening the safety cover 13 again and thereby putting himself in danger, a so-called safety lock SP is provided according to the invention.

The safety lock SP is explained below.

FIRST EXAMPLE

The safety lock SP ensures that the rocker is only then pivoted from its rest position in the direction of the saw blade when the safety cover 13 is fully closed.

The easiest way to find out how the safety lock SP works is by using the Figures 6 and 7 explain.

The safety device preferably includes a backdrop 15, as best in the Figures 2 , 3 , 6 and 7 can be seen. The gate 15 is mounted immovably with respect to the base frame 2.

This gate 15 provides a recess which is functionally divided into a free area 16 and a latching area 17. The locking projection 18, which is preferably designed in the form of a bolt and forms the locking member, protrudes into this recess. This is best done using the Figures 6 and 7 to recognize.

The free area 16 is designed in such a way that the locking projection 18 can execute the pivoting movement within the free area (when it has arrived there) which is forced upon it by the pivoting of the rocker 6. The locking projection preferably protrudes freely from the rod 19. It is then only attached to the rod on one side. The rod 19 is best in under the influence of one Figure 2 to be recognized spring translationally relatively movable to the rocker 6 mounted on this. The rod 19 therefore swivels together with the rocker, but can be moved back and forth with respect to this.

The safety cover 13 acts on the rod 19. It preferably acts on a free end face of the rod 19 a. For this purpose, the safety cover 13 with the in the Figures 6 and 7 locking bracket shown. The latter is cheap, but not always necessary. This locking bracket is ideally U-shaped or V-shaped. The two free ends of its legs are ideally attached to the safety cover 13. Usually they are welded on.

As long as the rod 19 is still in its of Figure 6 is in the position shown, its locking projection 18 engages in the latching area 17 of the link 15.

In this way, the locking projection 18 prevents the rocker from its rest position in the direction of the saw blade by means of a positive fit with the link 15, compare Figure 3 , Figure 2 and Figure 6 . When the safety cover is now brought into its closed position, the locking bracket 20 moves towards the rod 19. This movement goes like that Figure 6 by means of the arrow P2. As soon as the locking bracket 20 strikes against the free end face of the rod 19 due to this movement and continues to move in the direction of the arrow P2, it presses the rod 19 downwards. In broader terms, it can therefore be said that the safety cover actuates the rod.

As a result, the rod 19 is in the of Figure 7 Position shown transferred. As can be seen, the locking projection 18 connected to the rod 19 passes from the latching area 17 into the free area 16. The locking projection 18 therefore no longer locks, ie the rocker can be pivoted in the direction of the saw blade. By pivoting this way, the Locking projection 18 deeper and deeper into the free area 16.

Before the safety cover 13 has reached its fully closed position, however, what happened when comparing the Figures 6 and 7 can recognize. As a result of the downward movement of the rod 19 relative to the rocker 6, one of the flanks of the bolt 21 (which is preferably designed as a catch hook) has come into contact with the stop 22. The catch hook is held on the rod 19 so as to be pivotable about an axis 23 which is carried by the rod 19 and is usually arranged essentially horizontally. Therefore, the stop 22 has allowed the catch hook to pivot clockwise, at least in the representation that the Figures 6 and 7 demonstrate. As a result, the hook mouth 24 has grasped a section of the locking bracket 20 and received it.

As a result, the safety cover 13 is positively connected to the rod 19. This is because the catch hook is out of his of Figure 7 cannot pivot back and open counterclockwise as long as the rod is in the position shown.

Now is easy using the Figure 7 understand that the safety cover 13 is finally secured against unauthorized opening as soon as the rocker is now pivoted in the direction of the saw blade. This is because the locking projection 18 passes deeper into the free area 16 as a result of such a pivoting movement. It is caught by the upper reveal 25 of the free area 16 in such a way that the rod 19 cannot be moved back upwards. The reveal 25 is designed in all of this so that this state is maintained during the entire pivoting movement.

How to use the Figure 7 sees, the soffit 25 only comes out of engagement with the locking projection 18 again when the locking projection has again arrived below the latching area 17, which corresponds to the rest position of the rocker. Now the rod 19 can be pushed back upwards again under the influence of the spring, not shown here, into the from Figure 6 position shown.

All of this is supported by the spring that is assigned to the hook and pushes it into its open position.

The safety cover is now released and can be opened.

For the sake of completeness, it should also be noted that in Figures 6 and 7 two bearings 26 and 27 can still be seen, which are typically attached to the rocker 6. The bearings guide the rod 19 in a translatory manner on the rocker. One of these bearings, which is not shown here, can at the same time be designed in such a way that it also forms the stop 22.

For the sake of completeness, it should also be said that the rod 19 preferably runs parallel to one of the tubes which forms the rocker frame 10. In principle, the rod 19 could even run in such a tube.

In Figure 4 one again sees very clearly the link 15 already described, the rod 19, the locking projection 18, which is preferably freely cantilevered, and the Location of the backdrop 15 in the vicinity of the axis 7 around which the rocker pivots. Can be seen very well in Figure 4 also the one already mentioned, but in the Figures 6 and 7 spring (not shown) or the corresponding spring element 28. The spring element 28 is preferably designed as a spiral spring.

The Figures 6a and 6b describe a slightly modified variant of the lock for the safety cover 13, but which largely corresponds to the lock that the Figures 6 and 7 represent.

As with all variants, it is also preferred for the variant that the Figures 6a and 6b show, so that the rod 19 is guided in a closed tube or box girder which is usually longitudinally slotted on one side and which also forms the rocker frame 10 of the rocker 6. What does this variant of the Figures 6 and 7 differs is the type of stop 22. This is used by the Figures 6a, 6b shown variant formed by two bolts or pins which are attached to a side wall of said tube or box girder, e.g. B. screwed or welded, cf. Figure 6b . It is easy to see that the locking function is the same as before with the Figures 6 and 7 described.

In this context is also the Figure 6a very vivid. The safety cover 13 and the locking bracket 20 which is attached to it can be seen very clearly here. As described, it is preferably such that the locking bracket 20 or the other locking member used instead penetrates from above through a recess in the said tube or box girder in its interior. There the locking bracket meets the front of the rod 19. It presses it downwards, thereby unlocks the gate, not shown again here, and thereby causes the bolt 21 to pivot, which catches the locking bracket. In both Figures 6a and 6b the spring element VE can be seen, which biases the bolt 21 so that it moves into its open position as soon as it disengages from the stop 22.

The illustrated embodiment and its variant just mentioned are not the only embodiment of the invention.

SECOND EXAMPLE

An alternative embodiment is shown in FIG Figure 2 .

This alternative embodiment corresponds functionally completely to the embodiment described so far, in particular the entire area around the gate 15 or the gate plate corresponds to the embodiment described so far. What has been said in relation to the first exemplary embodiment also applies in a corresponding manner to this second exemplary embodiment.

What is different from this is the way in which the safety cover 13 is locked.

Here, too, the safety cover 13 is again preferably equipped with a locking bracket 20. The latter is attached to the safety cover 13 in the manner already described.

In addition, a bearing block 29 is preferably attached to the rocker itself, here in the form of an omega-shaped bent sheet metal part. This sheet metal part carries an axis 30, which in Figure 2 is only hinted at.

A bolt 21 is mounted so as to be pivotable about this axis 30. The bolt 21 has an actuating lever 31. This actuating lever 31 is preferably operated by an actuating arm 32. The actuating arm 32 is fixed on the rod 19, for example by screwing or welding, see also Figure 5 .

As can be seen, the locking bracket 20 (or possibly also the safety cover 13 directly) preferably comes to rest on the end face of the rod 19 again in the course of the movement. The installation takes place in the manner already described as soon as the safety cover approaches its closed position. How to Easily Using the Figure 5 can understand, happens as soon as the locking bracket 20 moves further down in the direction of the rod 19 and takes it with it, the following:
The rod 19 moves downward together with the actuating arm 32 attached to it. As a result, the actuating arm 32 comes into contact with the actuating lever 31 of the bolt 21.

A further downward movement of the actuating arm 32 together with the rod 19 causes the bolt 21 to pivot counterclockwise against the biasing force of its spring, not shown here. As a result, the latch 21 engages with its mouth over the locking bracket 20 and holds it in place. Also in this way, the locking bracket 20 and with it the Safety cover 13 connected to rod 19. This is done as described above.

The link 15 and the locking projection 18 assigned to it also work again as has already been described above. This means that the link here also holds the bolt 21, the locking bracket 20 and thus the safety cover 13 in the closed position as long as the rocker is pivoted back and forth. It is only released when the rocker has reached its rest position again. The safety cover 13 is then released in the manner already described above.

THIRD EMBODIMENT

Another alternative embodiment is shown in FIGS Figures 9, 10 and 11 .

This alternative exemplary embodiment corresponds functionally completely to the exemplary embodiments described so far. What has been said in relation to the first exemplary embodiment also applies in a corresponding manner to this second exemplary embodiment.

What is different from this is the way in which the safety cover 13 is locked.

This is best seen from the Figures 10 and 11 . The Figures 10 and 11 show the upper and the lower end of the rod 19, in a somewhat simplified representation. As evidenced by the Fig. 11 corresponds to the entire area around the backdrop 15 or the Link plate around the first embodiment described so far.

In contrast to the first and the second exemplary embodiment, the upper end of the rod 19 is equipped with a bevel 40 acting as a wedge, which is preferably implemented here on an L-profile 41 which is fastened to the rod 19.

As soon as the rod 19 is pressed downwards in the manner already described by the closing of the safety cover 13, the wedge slope 40 slides on the bolt 21, which is designed here as a translationally movable slide. As a result, the bolt 21 is displaced into its closed position against the spring element VE pressing it into the open position. As a result, the bolt 21 is pushed into the latch 42 or its eye assigned to it. The trap is attached to the safety cover 13. This will lock the safety cover in place. It should also be said that the bolt 21 is also attached to the rocker here. Furthermore, the bolt 21 is preferably arranged so that it is translationally displaceable in the horizontal direction.

With regard to all the exemplary embodiments described so far, it should also be said that the rod 19 and the gate 15 are covered in such a way that the user can really only push the rod 19 into the position that enables the rocker to pivot by holding the safety cover in brings it to its closed position. Otherwise the user cannot reach the bar.

THE INDEPENDENT INNOVATIVE HOLD-DOWN

What is particularly interesting about the whole thing is the hold-down device for the material to be cut. They show this Figure 3 and the Figure 8 .

The hold-down device preferably consists of several rods or disks which are pivotably coupled relative to one another.

The hold-down device for the material to be cut is arranged in the side wall of the rocker. What is meant is the side wall that faces the operator and that lies below the safety cover 13. For this purpose, an opening is provided in this side wall of the rocker. At least some of the rods, which here form the hold-down device, can protrude through said opening into the channel-like receptacle for the material to be cut.

The pivot lever 34 is an essential part of this hold-down device. The pivot lever 34 is held on the outside of said side wall by means of a bearing block 35. The bearing block 35 forms a pivot axis 38, which is spaced apart from the side wall and fixed in place on the rocker, for the pivot lever 34. The pivot lever forms a rocker with respect to the axis 38. One part of the rocker is on one side and the other part of the rocker on the opposite side of the axis. The translation can be structurally adjusted via the lever ratios that form the two rocker arms.

The pivot lever 34 is preferably connected to the pressure piece of the hold-down device via a further rod which can be pivoted opposite it and which forms a coupling element 36. For this purpose, the relative to the rocker 6 serves as a whole mobile axis 36a, which the Pivoting lever connects pivotably relative to one another with the coupling element. The coupling swivel axis is mobile in relation to the rocker.

Instead of a coupling element in the form of the rigid rod shown, it would also be possible to use a cable, preferably a steel cable that is essentially flexible in itself.

The pressure piece of the hold-down device is in turn held pivotably about an axis 39 on said side wall. The axis 39 forms a further pivot axis which is held stationary on the rocker. The pressure piece has a long side L which is formed on one side by the axis 39. The long side L preferably has teeth Z or form-fit elements with which the pressure piece can bite into the wood to be cut. The pressure piece 37 also preferably has a short side K, with which it is connected to the coupling element 36 in a manner that is pivotable relative to the rocker 6 as an entire mobile axis 36b. The short side K lies on the other side of the axis of rotation 39 compared to the long side. The translation can be structurally adjusted via the leverage that the two rocker arms form in the form of the long and the short side.

As soon as the user has removed the free side of the pivot lever 34 from the Figure 3 position shown down, the coupling element 36 is raised. It exerts tension on the short side of the pressure piece 37. This leads to the pressure piece 37 pivoting about its axis 39 (counterclockwise) inwards into the channel-like receptacle. There it presses on the clippings and prevents z. B. its rotation.

It goes without saying that this hold-down device is very ergonomic.

Because there is a kind of reversal of movement here, the hold-down does not have to be actuated by the operator by pulling upwards, but can be actuated by pushing downwards.

A power transmission is usually also achieved.

It is also noteworthy that, viewed as a whole, the hold-down device is designed in such a way that, when it is ventilated, it disappears completely behind the wall that limits the gutter-like receptacle for the rocker. There is therefore no risk of the hold-down device being accidentally taken along during the loading of the rocker and then being pressed into a position in which it can no longer perform its function or is even damaged.

In summary, it can be said that the pivot lever which acts on the pressure piece 37 of the hold-down device and which the operator actuates, by means of a pliable traction means, preferably in the form of the coupling element 36 articulated at both ends / on both sides, only pulls tensile forces on the piece or pressure piece 37, the here the actual hold-down function is exercised.

The great advantage of this hold-down device is that it does not reach through the safety cover or is held on it. It therefore does not increase the weight or the inertial mass that has to be handled during each of the usually innumerable opening and closing operations of the safety cover.

REFERENCE LIST

• 1 tilting saw
• 2 base frames
• 3 engine
• 4 saw body
• 5 protective cover
• 6 seesaw
• 7 axis
• 8 support
• 9 locking device
• 10 rocker frames
• 11 channel-like receptacle
  Slot for saw blade
• 13 Security Cover
  axis
• 15 backdrop
• 16 open space
• 17 Rest area
• 18 locking tab
• 19 rod
• 20 locking brackets
• 21 bars
• 22 stop
• 23 axis
• 24 hook mouth
• 25 Reveal of the open area
• 26 bearings
• 27 bearings
• 28 spring element
• 29 bearing block
• 30 axis
• 31 operating lever
• 32 actuator arm
  Hold-down
• 34 swivel lever
• 35 bearing block
• 36 coupling element
• 36a mobile axis of the coupling element
• 36b mobile axis of the coupling element
• 37 pressure piece
• 38 swivel axis
• 39 axis
• 40 Wedge slope / wedge surface / wedge
• 41 L profile
• 42 trap
• BS tree trunk
• Z Tooth of the pressure piece
• L long side of the pressure piece designed as a rocker
• K short side of the pressure piece designed as a rocker
• SP security lock
• P Movement of the safety cover in the closing direction
• P2 Movement of the locking bracket in the closing direction
• VE spring element

Claims (15)

1. Rocker saw (1) with at least one sawing element (4) and a rocker (6) which is mounted pivotably about an axis of rotation relative to the sawing element (4) relative to a base frame (2) with a channel-like receptacle (11) for the material to be cut, wherein the rocker (6) is pivotable between a resting position away from the sawing element (4) and a cutting position in which the sawing element (4) cuts the material to be cut which lies in the channel-like receptacle (11), wherein a movable safety cover (13) is provided on the rocker saw (1), which safety cover closes the loading opening of the channel-like receptacle (11) in its closed position, and releases the loading opening for loading in its open position, wherein a safety lock (SP) is provided, characterized in that the safety lock (SP) comprises a movable bolt (21) separated from the safety cover (13), which bolt blocks the rocker (6) when the safety cover (13) is fully or partially open, and releases the rocker (6) when the safety cover (13) is at least substantially closed,
   wherein the safety lock (SP) preferably comprises a sensing element which scans whether the safety cover (13) is closed and only releases the rocker (6) when the safety cover (13) is closed.
2. Rocker saw (1) according to claim 1, characterized in that the sensing element is a mechanical sensing element which is actuated by the safety cover (13), as soon as it is in the closed position.
3. Rocker saw (1) according to one of the preceding claims, characterized in that the safety lock (SP) comprises at least one link (15) which has a free area (16), within which the locking element can move back and forth in an unhindered way when pivoting the rocker (6), and a latching area (17) into which the locking element can engage in order to block the rocker (6).
4. Rocker saw (1) according to one of the preceding claims, characterized in that the sensing element is designed in such a way that it moves the locking element from the latching area (17) into the free area (16), when the safety cover (13) is brought into its closed position.
5. Rocker saw (1) according to one of the preceding claims, characterized in that the sensing element comprises either a Bowden cable or, preferably, a rod (19) which is mounted on the rocker (6), pivotable with it and displaceable relative to it.
6. Rocker saw (1) according to one of the preceding claims, characterized in that the rod (19) moves a locking element in the form of a locking projection (18) which protrudes into the link (15) and moves back and forth between the free area (16) of the saw and its latching area (17), when the saw is operated as intended.
7. Rocker saw (1) according to one of the preceding claims, characterized in that the link (15) is a plate, preferably a metal plate.
8. Rocker saw (1) according to one of the preceding claims, characterized in that the link (15) is rigidly fixed in the vicinity of the pivoting axis of the rocker (6) relative to the base frame (2), preferably in an area within an imaginary cylinder which has a radius of 20 cm, better only 15 cm and whose central longitudinal axis is identical to the pivoting axis of the rocker (6).
9. Rocker saw (1) according to one of the preceding claims, characterized in that, whenever the safety cover (13) is opened in the resting position of the rocker (6), the rod (19) is moved by the bias of a spring such that the locking projection (18) is transferred from the free area (16) into the latching area (17) and thereby blocks the rocker (6).
10. Rocker saw (1) according to one of the preceding claims, characterized in that the safety cover (13), when reaching its fully closed position, moves the rod (19) against the bias of the spring such that the locking projection (18) is transferred from the latching area (17) into the free area (16) and thereby releases the rocker (6).
11. Rocker saw (1) according to one of the preceding claims, characterized in that, in the course of its movement which transfers the locking projection (18) into the free area (16), the rod (19) actuates at least one bolt (21) assigned to the safety cover (13), which bolt holds the safety cover (13) in its closed position.
12. Rocker saw (1) according to one of the preceding claims, characterized in that the at least one bolt (21) assigned to the safety cover (13) is held closed by the rod (19).
13. Rocker saw (1) according to one of the preceding claims, characterized in that the free area (16) in the link (15) is a groove or a window with a reveal (25) which the locking projection (18) slides along when pivoting the rocker (6), so that the rod (19) is held by the link (15) in such a way that it keeps the bolt (21) assigned to the security cover (13) closed.
14. Rocker saw (1) according to one of the preceding claims, characterized in that the bolt (21) assigned to the safety cover (13) is pivotably mounted about an axis (23) carried by the rod (19) and movable back and forth with it in a translational manner and there is a stop (22) which comes into contact with the bolt (21), when the rod (19) is moved in the direction of the link (15), wherein the stop (22) is positioned in such a way that it forces a pivoting movement on the bolt (21) upon further movement.
15. Rocker saw (1) according to one of the preceding claims, characterized in that the bolt (21) assigned to the safety cover (13) cooperates with a spring which pushes it into its open position releasing the safety cover (13).

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