WO2007025503A1

WO2007025503A1 - Chainsaw with a protective device

Info

Publication number: WO2007025503A1
Application number: PCT/DE2006/001406
Authority: WO
Inventors: Christian Seefluth
Original assignee: Christian Seefluth
Priority date: 2005-08-31
Filing date: 2006-08-11
Publication date: 2007-03-08
Also published as: DE102005041204A1

Abstract

Chainsaw comprising a chain which is driven by an electric motor or an internal combustion engine, runs on a guide bar (c-2) and has a housing (c-1) and a handle (c-10) with operating switches, and comprising a chain guide bar (c-2) projecting from the housing, wherein protective devices (c-4) (c-3) are provided for the saw chain (c-14), emerging from the motor/engine housing (c-1) and running forwards, and in its front deflecting region at the outer guide bar end, which protective devices (c-4) (c-3) a) are designed parallel to the course of the guide bar as flat bodies running at a small distance from the chain (c- 14) and having a material thickness - and preferably also a surface form - that is equal to or smaller than that of the chain guide bar (c-2), or as a protective rail (c-4) and/or b) are designed in the front deflecting region of the saw chain as a protective cap (c-3) entirely, mainly or partly enclosing the saw chain and the chain guide bar (c-2), as a result of which kickback of the saw chain during the sawing operation is completely ruled out and a risk of injury to the person operating the implement is effectively reduced, such that an effective simplification in the handling of chainsaws is achieved.

Description

CHAINSAW WITH A PROTECTION DEVICE

DESCRIPTION

The invention relates to a chain saw with a motor-driven, circulating on a sword chain, consisting of a built-in a housing with handles and control switches electric or internal combustion engine whose drive axle has a chain drive wheel, which those of the protruding from the housing and attached to the housing chain sword guided, at the upper Schwertrand from the housing out to the front and after passing through the deflection area at the front sword end at the lower Schwertrand in the work area returns running saw chain drives.

Known chainsaws have the disadvantage that their handling in the sawing operation due to the open-ended saw chain is associated with a significant risk of injury. Although protective covers for the chain sword with chain guided by it have become known, however, they can only be used in the resting state of the chain saw. Further known protective measures against injuries are that the chain saws have quick-stop switches or devices of different design which, when the saw bounces up, should cause a forced deceleration of the revolving chain by means of a movable brake shield next to the handle. Another quick stop of the saw is effected in an electrical manner by not only interrupting the power to the drive motor but also electromagnetically causing deceleration of the circulating chain. These measures serve to reduce the risk of injury when working with the chainsaw.

Despite these known measures, the operation of a chain saw requires a high degree of concentration and previous training and such a device can not be operated safely by untrained persons. A safe protection against serious injuries to the circulating chain is not sufficiently achieved by the known devices. The invention is therefore an object of the invention to provide a motor-driven chainsaw, which is largely harmless to handle and in which the risk of injury is reduced sustainable. Another object is that due to the simplified handling and the versatility of the applications and thus an extension of the application is to be achieved in practice.

These objects are achieved by the characterizing part of the main claim 1. Thus, the injury relevant and kickback triggering area of the high Shielding chain and the deflection of the chain shielded against contact and a relaxed and largely safe working with the saw is guaranteed. In almost all embodiments of the invention, a kickback of the chainsaw is not possible.

The trained on the chain sword and on the leading chain straight or in the deflection of the chain along running trained as a second sword or guard rail protection device is preferably by means of screw or other positive connection on chain link especially where the sword exits the housing, by means of two half-shell plates or a single side panel releasably secured. In this case, the attachment can be easily such. be carried out by thumb screws that replacement of the protective rail against another with a different shape and

other purpose or even a complete removal of the guard rail for special work can be done in a simple way.

A further embodiment of the invention is that the protective device is formed in the deflection of the chain at the outer sword end by a protective cap by this is formed in the deflection of the chain as pluggable protective cover and - in order to create a free space for the circulating chain - in particular by means provided on both sides flat Zwischenbzw. Spacer on the sword - preferably by means of screwing and designated hole in the chain sword - is attached. In this way, the deflection is completely shielded, whereby the emergence of a return Shock of the chainsaw is effectively prevented during operation.

Alternatively, the protective body in the deflection of two adapted to the shape of the overlying chain as well as the shape of the sword - especially articulated on one side or at the lower or front edge - half shells, which by means of screwing or stud and hole in the chain sword or other positive connection - in particular releasably - are attached.

The protective device in the form of a second sword, which is mounted at least in the leading portion of the chain from the housing to ümlenkbereich the chain is flat, formed in the material thickness (thickness) maximum equal to the chain sword and the housing outlet portion of the chain sword, the housing itself the chain saw or alternatively both, the chain bar and the housing - in particular form-fitting and releasably - preferably by screwing and thus outside of the work area. For the second sword or the protective rail while a material is selected, which corresponds to the consistency of the chain sword and this is thus equal in strength and rigidity and adjusted. In a further embodiment of the invention a - in particular additional - protective body is provided in the form of a bracket, which at the sword end - in particular in connection with the protective cap in the deflection - and in the region of the sword at the housing outlet by means of a half-shell attachment body located there on one or both sides, is preferably releasably attached. This guard is at a certain distance to the Chain sword - especially in addition to the described second sword or guard rail. - mounted and has a special design on the top of a widening in order to reduce the residual risk for injuries in the upper area between leading chain and operator on. The guard can be formed arbitrarily and preferably consists of light metal or plastic half shells, which are laterally attached to the chain bar at least one side - but preferably both sides - on the cap in the front deflection and the housing outlet region of the chain sword in particular releasably secured.

Alternatively, the additional protective device designed as a bracket is fastened to the protective cap of the front deflecting region and to the housing of the chain saw in a form-fitting and preferably detachable manner. To simplify the construction of the protective body in the form of a bracket and the cap at the deflection are formed as a unit in HaIb- shell construction and at least on the housing of the chain saw - but especially in the deflection and at the housing exit area of the chain sword - positively and releasably attached.

In the embodiment with a protective cap at the deflection region, a running or guide wheel for the additional chain guide is provided in a special embodiment of the invention, which is mounted in the half shells of the protective cap in the deflection region or in laterally mounted flange plates. Between the tolerance bearing axle of the sprocket and the housing of the protective cap as an abutment a tensioning device for the chain can be provided so that it can be tightened at any time in a simple manner - eg by operating a knurled wheel. The longitudinal edges of the chain blade have in such an embodiment, a slight longitudinal constriction, which provides an additional slide for the free-running chain at the moment heavy load.

In order to further defuse an unintended, sudden contact of the protective rail by the operator, the protective body designed as a second blade or rail has a longitudinally extending groove in which an additional protective strip made of elastic or resilient material - in particular by gluing or riveting - is firmly attached. This additional protection strip made of elastic material bends to the side during a violent contact or deforms and continues to reduce the risk of injury effectively.

The equipment according to the invention of the chain saw allows extended areas of application. The chain saw may, for example, on the housing have a fastening device which is for a horizontal or vertical - preferably form-fitting - the same on a countertop, a work table or a frame by means of suitable shaping with holes or Gehäuseausformungen, in particular with the aid of clamping devices designed. In this way, the chain saw can be used stationary with vertical or horizontal sword position, without the running chain area being a danger for the operator or persons in the working environment. To simplify such an application, the worktop can be about an axis tiltable (rotatable) to be able to use the vertical or horizontal position of the chain sword alternately can. Such an application is of considerable importance particularly when sawing branches or lumber with a smaller diameter. The clippings are introduced by the operator to the work area of the stationary mounted saw from below or horizontally and sawn at high operating speed. In order to adapt the chainsaw to such working conditions, the work area within the trained as a bracket protection device by the positive attachment of - at least on one side of the chain sword - backdrop-like side plates or - plates is reduced accordingly. For attachment of the protection device on the chain blade narrow housing and vertically extending and in particular flanged on both sides flat-shaped mounting body (side flange) are provided in some embodiments at the housing outlet, which are designed in particular as at least one side of the sword (vertical) extending or flanged extension of the protective device and preferably form a coherent unit with the protection device. But they can also be designed as a fastened by screwing separate Seitenflansch- body.

A specific design of the protective device according to the invention is that instead of the above-mentioned protective strap an elastic band of any material, in particular made of thin steel (spring steel), plastic or in the form of a link belt is provided which on the primary protection device in shape a guided along the chain second sword in the execution of a flat body

(Guard rail) rests and in particular on one side by a resilient pulling device - in particular by means of drawstring - is resiliently mounted in order to dodge the material to be machined according to the required depth of cut can. At rest, the elastic band then springs back into the position resting on the protective rail position by means of the tension band or alternatively it is moved by a retractor of the tension band by the action of the drive force of the chain saw.

Other versions with movable or hinged mounted protection device are that the protective device hinged hinged to the housing or the sword and in particular in the end positions can be locked.

A particular embodiment of the chain saw according to the invention further consists in the fact that the chain running back into the housing is also shielded in the working area by a protective rail which is in particular U-shaped in cross-section. Such a protective rail preferably moves on a sliding guide in the lower housing area and can be withdrawn at any time - at the beginning of a saw cut - by the operator manually or at the push of a button electromagnetically or automatically by motor force to release the chain in the work area. This is a considerable safety advantage for the performer, especially when working in treetops or when cutting down tree trunks from top to bottom. Some embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it:

1 shows a motor chain saw in a side view with attached to the sword and housing protection device in the form of a trained as a guard rail second sword,

Fig. Ia shows a cross section through the sword and protective device in the area A - B according to Fig.l, Fig. Ib an embodiment according to Fig.l with shortened second sword

Fig. Ic an embodiment according to Fig.l with additional

Elastic strips on the upper edge of the protective device, Fig. Id Cross sections through the protective device (second blade) with elastic strips on the upper edge,

Fig. Ie the additional attachment of the guard rail on

Chain sword in the front chain deflection area as a cutout in lateral view,

2 shows a chain saw with protective cap on the front chain deflection region of the chain sword,

2a is a side view of the protective cap of FIG. 2 with folding device by means of hinge and quick release,

2b shows a cross section through the protective cap according to Fig. 2a, 3 shows an embodiment with double attached to the chain sword guard rail with hinges and quick release,

3a shows cross-sections according to FIG. 3 in the region of the housing-side side flange (cross-section A-B) of the protective device with hinges and quick-action closure,

Fig. 3b shows an embodiment according to FIG. 3 with an additional, adjustable guard bar, FIG. 4 shows a stationary saw mounted on a work surface chainsaw with protective rail and guard and reduction of the working area by a sliding plate - in a side view,

4a shows a stationary chain saw according to Figure 4 in the vertical position of the chain sword,

5 shows an embodiment with protective rail, guard and gate plate with reduced working area in side view,

5a is a plan view with protective bracket broadening measure FIG.

6 shows a fixed stationary chainsaw in a vertical position with laterally and hingedly mounted in the work area mudguards,

6a shows the cross section in the chain sword area with hinged protection device according to FIG. 6, FIG.

7 shows an embodiment of the chain saw with a second chain guide wheel in the front chain deflection in a lateral view,

FIGS. 7a and 7b show a partial view with a second chain guide wheel in the area of the protective cap in FIG Chain deflection in side view and in longitudinal section,

8 shows a side view of the embodiment with an elastic protective tape resting on the protective rail,

8a, the execution of Figure 8 in the sawing operation, also in side view,

FIG. 8b shows a protective band in the form of a link band or link chain in a resting state lying on the guard rail in a perspective side view. FIG.

9 shows the embodiment with a hinged hinged, double-sided, additional protection device,

9a, the embodiment according to Figure 9 but with a narrow hinged protection device for the returning chain,

Fig. 10 shows an embodiment according to Figure 9, however, with a run in a sliding device protection device for the returning chain.

(Note: Parts of the same function have the same reference number in all drawings in the drawing - see the list of reference signs.) The letter above indicates the reference to a specific drawing, eg b-14 (b for Fig. 2) for the leading chain in FIG. 2, etc. Reference numerals not mentioned in the text are explained by the list of reference numerals.)

In Fig. 1, an electric motor-chainsaw is shown in lateral side view. The chain sword a-2 with umlaut Fender saw chain protrudes in a conventional manner from the housing a-1 with therein motor a-17 and attached handle a-11 with control switches out. According to the invention, a protective device a-4 designed as a flat body, second blade or protective rail is constructed above the leading saw chain a-14 which protrudes out of the housing and which is equal to or less than the chain bar a-2 in terms of material thickness and the housing fastening tongue a-52 protruding into the housing area and the screw connections a-22 preferably being detachably fastened. The protective device a-4 extends into the front deflection of the saw chain, so that the known from practice, dangerous kickback by touching the saw chain with the sawing material in the chain deflection area a-37 is safely excluded. On a previously used rapid stop device of the chainsaw can thus be dispensed with.

The sawing or working area is thus formed exclusively by the returning saw chain a-15. From there, the saw can also perform deep, across the width of the sword a-2 and the protective device a-4 outgoing saw cuts, since the protective device a-4 in the material thickness is made as thin as or thinner than the chain sword. Alternatively, the protective device a-4 may also be fastened by means of lateral flange body in the housing outlet region of the sword a-2, in particular by screwing. Such an embodiment is explained in more detail in Figure 3. Fig. Ia shows a cross section of Fig.l in the area A - B of the chain sword, wherein it can be seen that the trained as a second sword guard rail a-4, the deep Penetration of the chainsaw into the respective clippings in no wise hindered. In order to exclude a hooking of the second sword, the chain-side lower edge thereof may be obliquely ground or rounded. The protective device in the form of a second sword, which encloses in Fig.l the chain deflection, can be removed in a few steps and replaced with another shape or design of the second sword. In Fig. Ib a protection device is shown in a modified design. Here remains the chain deflection a- 37 unprotected, so that even clippings - such as thick tree trunks - whose diameter is greater than the sword length of the chainsaw, can be edited. However, the protector a-4 causes the saw operator to be protected from contact with the leading chain a-14. A - not shown - known from previous practice quick stop device will be required in this embodiment. In Fig. Ic is above the protective device a-4, an elastically or resiliently formed, longitudinal elastic strip a-21, which is preferably glued in a groove in the protective rail a-4, to the upper edge of the protective device a-4 against injury on defuse. The elastic strip a-21 bends in abrupt contact to the side or springs - executed in a two-layer design - a shock as shown in Figure Bl in Fig. Id from.

Fig. Id shows two embodiments of FIG. Ic with longitudinal elastic strips in cross section. The elastic body a-21 are - as already mentioned - glued into a groove of the protective rail a-4 and can be additionally secured by countersunk rivets or screws. The elastic body a-21 is shown in the representations A and B in the rest position and in Al and Bl in the event of a sudden contact in the resulting cushioning deformation.

Fig. Ie. This section of the chain link in side view shows an alternative design of the protective device a-4 in the front chain deflection, in which the protective device a-4 is additionally connected by means of laterally bent fastening tongues A-56 one-sided or two-sided form-fitting with the chain sword A-2 , Since the use of a cutting or sawing performance in the front deflection is rarely needed and only in special cases, this embodiment can be used for most sawing work with the chainsaw application.

Fig. 2 shows the embodiment of a chain saw, in which a backlash thereof by the protective cap b-3 is reliably prevented. The clear width of the protective cap b-3 is dimensioned so that it can be slipped onto the chain bar b-2 with a circulating chain and by means of the inserted spacers b-lβ on the chain bar b-2 without contact to the chain by means of the screws b-7 is releasably attached. Also in this embodiment - as I said - a kickback of the chain saw is not possible and the return range b-15 of the chain provides sufficient distance between the cap b-3 and housing b-1 to perform almost all sawing work in this diameter range , In this version with protective cap b-3, a second blade in the form of a longitudinal fenden guard rail along the leading chain b-14 are provided.

In the embodiments of Fig.2a (side view) and Fig.2b (cross section), the protective cap b-3 is not plugged and screwed as shown in Figure 2, but by means of the hinge (hinge) b-38 folded and by guide pin (stud) b-40, which will be held in holes in the chain-link, will be fixed, while a clip b-39 pushed onto a short rail will serve on the opposite (upper) side of the cap b-3 to secure the attachment to the b-2. In this embodiment, the required spacers between cap b-3 and sword b-2 are constantly connected to the existing two hinged half shells cap b-3 or form part of the cap b-3. Instead of the rail with bracket b-39 and screws or other types of positive connection can be used. A removal of the protective cap in special cases is thus possible in a simple manner, wherein it should be noted that then on the commonly available quick stop device (not shown) can not be waived.

3 shows a combination of FIGS. 1 and 2 with a simplified protective cap c-3, which forms a unit with the protective device c-4 and, as a result of the joints c-38, after the closure c-39 has been released Whole unfolded and removed in this simple way or can be reinstalled. By means of the holes in the chainwheel c-2 - the protection device c-4 is positively fixed to the sword. The protective device c-4, which preferably forms a unit with the part designed as a protective cap c-3 in the deflection region, is at the front End in the deflection of the chain thus by means of pins (studs) c-40 and the housing exit area of the chain bar through the side connecting plates (flange) c-51 also connected by the pin c-40 with the chain bar c-2 form-fitting and releasable. The closing device c-39 is explained in more detail in Fig.3a.

If necessary, the protective device c-4 also has a longitudinal elastic body - as a-21 in Fig. Ic - to further prevent any risk of injury in the sawing operation. An articulated lever plate close to the handle for automatic rapid braking of the circulating chain during a kickback of the chain saw can therefore also be omitted in this embodiment, since a kickback of the saw is not possible. Alternatively, the protective device c-4 on the housing side on the motor housing c-1 - similar to Fig.l - be attached.

In the embodiments according to FIGS. 1 to 1c, the fastening of the second blade a-4 can in principle also be carried out as shown and described in FIG. 3: By means of one-sided or bilaterally provided, projecting side flanges (c-51 in FIG .3) is the second sword only on the chain sword form-fitting and preferably releasably attached.

FIG. 3 a - cross-sections A and B in the chain-link area at the housing outlet and at the outer end of the blade c-2 in FIG. 3 -corresponds to the design of FIG. 3 and again shows the protective cap c-3 or the side flange embodiment c-51 , which is hinged at the bottom by means of the hinge (hinge) c-38 and thus by the standing bolt (pin) c-40 is fixed to the sword c-2. The folding cap c-3 is held together at the top by means of an arbitrarily designed, designed here as a sliding closure positive locking or connection. In this way, a quick replacement or removal of the protective device c-4 is guaranteed.

In FIG. 3 b, the chain saw has a protective bow c-5 above the sword area, which bow is widened from above in the direction of the top and thus represents an additional protection for the person operating it. At the same time, the bow c-5 with respect to the distance to the sword on the guide rods c-35 is infinitely adjustable and fixed by means of the locking screws c-36 or in any other way, so that the guard c-5 are adjusted with respect to the required working height in the interior of the same can. An elastic body along the protective rail c-4 can be dispensed with in this embodiment. However, the protective rail c-4 prevents inadvertent reaching into the leading chain below the bracket c-5 during operation.

In Fig. 4, the chain saw in stationary use with a countertop d-30, a work table or frame is releasably and positively connected and thus for new and expanded work areas (for example, for cutting medium knots thickness or timber) used. The attachment can be done in any way, e.g. by means of clamp bodies d-29 and d-31, which are connected by wing screws d-28. For this purpose, the housing of the

Chainsaw corresponding formations d-27, undercuts or the like to these in the illustrated Way to fix. Lateral d-48 slide plates attached to the sword, which can be made in different dimensions, reduce the working range of the returning chain to a desired level and increase safety by partially covering the chain. The parts to be sawn such as branches, lumber or other woods are brought by the operator from below to the saw, with any type of injury risk through the guard rail and the bracket d-5 is largely off. The slotted cover plates can also be made of plastic and fastened in different positions according to the holes d-47 in the sword. The intermediate bodies d-lβ on both sides of the sword provide the necessary distance between the chain and the guide plate d-48. The slide plates can also be hung in the bracket d-5 and at the bottom edge

be positively connected by means of a slide-rail. The intermediate body d-16 is permanently attached to a Seitenkulisse and has studs (pins) which engage in the holes of the chain sword and fix the backdrop. The start of the saw is preferably made by a foot switch, so that both hands of the operator are always free for the handling of the crop. The drive can - as with all Ausführzungen- done by electric or internal combustion engine. This embodiment of the invention has been tested in practice with great success and by bringing the cuttings from below - e.g. the branches of a treetop - became a safe working with high

Cutting performance determined. Because the parts of the protection device are quick and easy to replace and these Before-preferably attached exclusively to the chain sword, for example, the bracket d-5 can be replaced at any time with a different shaped.

In the stationary application of the chain saw according to Fig. 4a, the chain sword is positioned vertically to the worktop, so that the saw like a band saw, but in a much more compact design, can be used. Here, too, the working area can be reduced to the required level by means of cover plates (cover sliders) d-48 in order to cover the area of the high-speed chain as far as possible. In both cases, as already mentioned, a foot switch is preferably provided to switch the saw on or off, or to engage and accelerate it when driven by an internal combustion engine.

Fig. 5 and Fig. 5a show - in side view and top view from above - a chainsaw in an alternative embodiment to Fig. 3a with protective cap e-3 in a simplified design and protective rail e-4 and guard e-5 with link plate e-48 to the desired reduction of the working area. With this design, smaller and medium-sized branches and timbers can be cut particularly easily and safely due to the smaller working area with the greatest possible protection provided by the accessories mentioned above. The protective cap e-3 is formed here as a unit with the safety bar e-4 and advantageously consists of two half-shells which in the deflection of the chain and the housing outlet area by means of the screw e-9 and e-7 and e-8 using intermediate - or spacers e-16 are detachably connected. On the housing side of the working area, the half shells can either according to Figure 4 or Figure 3 on Sword e-2 or directly on the housing e-1 chainsaw releasably and positively secured. The protective bow e-5, which is widened in view from above or from above in FIG. 5a, is additionally provided with a protective cushion e-β in this design in order to dampen unwanted, hard contacts. The protective rail e-4 lies with the ends between the half-shells of the iron e-5 and protective cap unit e-3 and is connected in this embodiment by means of the screw connection e-9 with the protective bracket e-5. The distance between the lower returning chain e- 15 in the work area and the protective bracket e-5 can be increased to any desired size by ironing and adapted to the cut material to be cut.

Fig. 6 shows an alternative embodiment of the chain saw of Fig. 4a in which the chain sword is vertically attached to a worktop g-30. Here, the working area of the saw is provided on both sides with a thin-walled gate (protective flap) g-34, which automatically covers the free-running saw chain during breaks by the return force of the spring g-49 and its own weight. In addition, an electro-magnetic or mechanical device can be provided which holds the protective flap g-34 in the rest position and unlocked directly before the start of sawing - in particular by the switch-on pedal. The protective flap g-34 may differ from the

Representation in Figure 6 in the shape and with respect to the position of the axis of rotation g-50 be designed arbitrarily. The cross-sectional drawing of FIG. 6a shows the arrangement of the protective flaps in the section region a-b of FIG. 6 with the same reference numerals.

Fig.7: A particular embodiment of the invention, the Fig. 7 in side view. Here, the protective cap h-3 already described above is used at the sword end in the deflection area for the mounting of a second chain guide wheel h-44. In this way, the chain is supported and guided on two wheels, the inner drive wheel of the motor and the outer idle guide wheel. This can be dispensed with a complex and costly lubrication of a sliding chain. As in many other technical drive ranges, the chain circulating freely over sprockets requires only occasional grease or oil lubrication. By extending the chain sword by a few centimeters, an equivalent work area can be achieved as with a sliding and free circulating chain. The chain sword h-44 has in this embodiment a running over the entire length of slight constriction in order to reduce friction between the chain and the sword h-2 or completely avoided. Since a freewheeling chain with free sword end is rarely needed when felling large trees, a chain saw as described in Fig. 7 is suitable for most practical applications and can be used for continuous operation because of the second sprocket.

In FIGS. 7a and 7b, the protective cap h-3 is fitted with a chain tensioning device h-41 in a slightly different form, so that the chain can be tensioned by means of the clamping screw h-2β or retightened at any time in a simple manner. In order to make this construction possible, the chain in the deflection region of the same through the chain Rad h-44 out and existing in this embodiment of two articulated halves existing protective cap h-3 (hinge / hinge h-38) is by means of screws h-7 or alternatively as in Fig. 2a and 2b by means of studs, in holes in Chain sword h-2 positively and detachably attached. The axis h-43 of the chain guide wheel h-44 is mounted in a slot to provide the required tolerance of storage during tensioning of the chain.

This embodiment of the chain saw with a second chain guide wheel h-44 according to FIG. 7 to FIG. 7b can basically be used in all other embodiments with protective device or protective cap in the deflection region of the chain - with correspondingly adapted structural design in detail. Fig. 8 and Fig. 8a show an embodiment of the invention in which the protective device consists of a - as described above - parallel to the chain and slightly bent at the top extending protective rail i-4, on which in addition to a bending elastic protection -Band i-57 - as part of the protection device in total - rests. As soon as the material to be sawn requires more space between the lower, returning chain in the working area and elastic band i-57, the elastic band i-57 yields, springs upwards and returns to the rest position shown in the drawing after the cutting process. The suspension is wholly or in addition to an inherent elasticity of the protective tape i-57 preferably achieved in that the elastic band end i-60 is connected by means of a thin and slightly flexible cable i-58 on one side with a retractor i-59, the retracting force by a Spring or - correspondingly - by means of the motor power of the drive For example, by a magnetic, sliding or slip clutch is generated. The illustrated circle i-54 in Fig. 8a represents the extent of a already largely cut sawing material (such as a

The spring stroke of the elastic protection body i- 57 together with the distance returning saw chain / top edge guard rail i-4 corresponds to the length of the working area of the returning saw chain i-15 _{f to} use the entire working range of the chain can. Fig. 8 and Fig. 8a show the basic principle of a protective device with elastic or resilient protective tape. The guide of the protective tape i-57 in the movable end area i-60 can be done in any other way different from the representations. For example, the guard band i-57, with the movable end i-60 or the cable i-58 between the drive motor of the chainsaw and handle can be passed through a slot or opening in the housing i-1, where then the reeling mechanism i-59 located. Such a design of the protective device of the chain saw the protection for the operator is effectively increased both during and outside the cutting process and can be dispensed with a quick stop device - by eliminating a possible kickback of the chainsaw - even in this embodiment.

8b shows, in addition to FIGS. 8 and 8a, an alternative embodiment of the releasable, flexurally elastic protective device, in which the protective band i-57 is formed as a link band. It may be a textile, rubber or plastic tape, which is reinforced by cross bars. 9 and 9a show embodiments of the invention in which the work area of the saw chain, a portion of the chain sword and the protective device are covered by side plates k-βl, which project slightly beyond the chain teeth of the working area (downwards) and which by means of Swivel joint k-12 in a chain-sword about right-angle position - in particular upwards - are pivotable. In the drawings, the cover plates k-61 are in working position and are pivoted - eg in a work break - according to the arrows shown in the rest position in which the chain teeth and parts of the sword, etc. are covered to protect the operator. The pivoting movement can be done manually or by motor or e- lektromagnetische force by an arbitrarily designed switching device in this embodiment.

Finally, Fig. 10 shows an embodiment of the chain saw which is particularly intended for difficult work operations, eg for working in treetops or at those places where "all-round protection" is particularly urgent for the operator The lower guard rail 1-62, which is preferably U-shaped in cross-section, is mounted on the housing along the saw chain in the working area and can be moved manually on the housing immediately before starting the sawing process Tension band 1-63 by means of a retractor and magnetic or centrifugal clutch and motor or electromechanical force effect under release of the chain working range in a housing rail adapted to the protective rail and correspondingly shaped housing 1-66 Chainsaw to be withdrawn. The 1-65 deflected over the guide roller 1-64 drawstring, however, can be connected to a retractor with increasing spring tension, which automatically retracts the sliding guard rail after release of the clutch in the protective position. Such a construction can be made very light, so that only a small or no additional weight of the chain saw is to be expected, as can be dispensed with a quick stop device in a conventional form.

The specific technical design features of the invention or their individual design features may also be used in a different composition than in the descriptions of Fig.l to 10 in a chain saw application, thereby creating different further embodiments of the invention.

The advantages that can be achieved with the invention are, in particular, that in practice for the operator of a chain saw, an injury risk is effectively reduced or largely eliminated. The limitations in the use of chainsaws, which - so far with free rotating chain - are greatly reduced by the invention or even repealed. The idea of users dealing with a highly dangerous work tool is replaced by the certainty of being largely protected against the risk of injury. This will make the field of practical, especially non-professional application significantly expanded.

In particular, the application of stationary chainsaw with protection device for shredding thin branches, strips or beams opens up new applications and thus expanded market shares for the manufacturer. The use of a relatively bulky band saw at locally changing workstations - e.g. For carpenter work - can be replaced by the chainsaw - at the same time lower construction costs and more compact design and easier transport conditions.

As already mentioned, the chainsaw - structurally conditioned in most embodiments - free from the previously occurring risk of kickback, since the front, the kickback generating deflection of the chain is shielded by the protection device.

The chain saw according to the invention thus allows relaxed and largely safe working and thus opens up to people circles in the application of the chainsaw in the field of wood shredding and processing, for which less training and experience are prerequisite. Regarding the field of application, the chainsaw can be safely used in the branches of treetops and hedges, as the risk of kickback and unwanted, dangerous contact with branches is effectively excluded by the protective device.

Furthermore, it is advantageous that - in some versions - the specific accessories of the chain saw can be quickly and easily removed at any time, if the relatively rare case occurs that, for example, a tree to be felled, in which the trunk diameter is much larger than the sword length of the saw. Furthermore, the manufacturing and development costs, eg. by direct attachment of the protective device on the chain sword, kept low and the previously required structurally relatively complex automatic chain stop to avoid injury to the operator in a kickback of the saw is omitted in almost all embodiments of the invention.

Finally, the storage of a second sprocket in the protective device in the outer chain deflection allows a low-wear chain guide, so that dispensed with the previously required costly permanent lubrication of a sliding circulating chain and can be replaced by a sporadic grease lubrication.

LIST OF REFERENCE NUMBERS

Housing with holding14 leading saw handles and motor chain

Chain sword 15 Returning saw

Protective cap on the 35 chain (Arbeitsbe¬

Sword end rich)

2nd sword (protective 16 intermediate body

Rail) (spacers)

Guard 17 Drive motor in

Bracket widening 40 Housing / combustion with padding or Elekt¬

Connecting helicopter ben 18 chain drive wheel

Protective cap / 19 Housing clamp foot

Sword end 45 20 Clamping device

Fastening screw (counter plate) ben protective rail / 21 impact protection at 2.

Sword on the housing blade exits 22 fastening screw

Connecting screw50 Protective sliding between bracket ne / housing and rail 23 Connecting screw

2nd handle guard rail /

Handle with protective cap serving elements 55 24 thru-axle

Swivel joint 25 Connecting screw

Lever plate for strap / Ketten¬

Fast braking is heavy on the housing

(in case of kickback) exit 26 chain 47 bore in Ketten¬

Clamping screw sword

27 Housing recess 35 48 Cover for desk mount49 Return spring 50 Rotary axis

28 clamping screw 51 side

29 Clamp body flange plate

30 table or Ar40 52 fixing tongue worktop of the protective rail

31 Clamping counter body in the housing area

32 mounting bracket 53 Verbindungsschrau¬

33 holding rail ben sword / Ge¬

34 protective flap 45 housing

35 guide rods 54 diameter d. Sä¬

36 locking screws good

37 deflection area of the 55 connecting screw

Chain guard rail /

38 hinge 50 flange

39 closure 56 fixing tongue

(Closing guard 4) 57 Bend elastic

40 pegs (stud bolts) Guard band

41 Clamping device 55 58 Cable pull

42 clamping slot in the 59 roll-up mechanism

Protective cap 60 Guard band end

43 axle for sprocket 61 mudguards

44 Outer sprocket 62 sliding

45 saw chain 60 protective rail

46 Connecting screw 63 lower drawstring

Guard rail / 64 pulley

Side flange on the 65 upper drawstring

housing outlet Housing f. Guard rail 62

Claims

1. Chainsaw with a motor-driven, on a sword (2) encircling chain, consisting of a in a housing (1) with handles and control switches built-in electric or internal combustion engine whose drive axle has a chain drive wheel, which from the of Housing (1) outstanding and attached to the housing chain sword (2), driven at the upper Schwertrand out of the housing forward and after passing through the deflection area (37) at the sword end at the lower Schwertrand in the work area running back saw chain (15) , characterized in that a protective device is provided, which a) as a on the leading chain (14) to the deflection (37) of the same along a small distance along led, in particular designed as a guard rail second sword (4), in the material thickness equal or less as the chain sword (2), is formed and / or b) in the front deflection region (37) of the saw chain, the chain sword (2) and the saw chain as a protective cap (3) or in the form as on the chain teeth protruding side plate (s) covers at least on one side.

2. chainsaw according to claim 1, characterized in that the protective device (4) by means of at least one side of the chain bar (2) provided side flanges (51) outside the working area of the Saw chain - namely at the Gehäuseaustrittsbereich- or in the deflection region (37) of the saw chain - preferably releasably and positively, in particular by screwing, is attached.

3. chainsaw according to claims 1 and 2, characterized in that the protective device (4) on the housing (1) of the chainsaw, on the chain sword (2) by means of laterally overlapping side flanges (51) or both on the housing (1) and the chain bar (2) is preferably releasably attached.

4. chainsaw according to claims 1 to 3, characterized in that the protective device (4) has an approximately the length of the chain sword (2) spanning protective strap (5), which with the parts of the protective device at the housing outlet and in the deflection as second sword (5) 4) and protective cap (3) is in particular releasably connected and / or on the housing - preferably in addition - is positively secured and whose clear distance to the lower, receding saw chain area (working area) (15) corresponds to the length of the working area of the saw chain.

5. chainsaw according to claims 1 to 4, characterized in that the housing (1) by means of suitable shaping by an attached device with a - tiltable and fixable about an axis by 90 ° - worktop (38), a table or a frame is positively and detachably connected such that the chain sword (2) at least approximately in a vertical or in a horizontal position and of the work surface (38), the work table o- the work frame protrudes approximately vertically upwards or laterally horizontally - approximately at right angles - protrudes.

6. chainsaw according to claims 1 to 5, characterized in that the individual functional parts of the protective device such as second sword (guard rail) (4), protective cap (3) and guard (5) materially form a coherent unit of two preferably hinged or detachable connected half shells and by means of screwing on the chain sword (2) and / or on the housing (1) or by means of holes in the chain sword (2) and stud bolts (40) on at least one of the half shells - in particular by means of locking device (39) at the joints ( 38) opposite (upper) side - are positively fixed and preferably releasably fixed.

7. chainsaw according to claims 1 to 6, characterized in that the functional parts of the protective device (4) as a unit or by itself only on one side of the chain bar (2) - appropriately shaped and in particular releasably - are attached.

8. chainsaw according to claims 1 to 7, character- ized in that the protective device or parts thereof, in particular designed as a guard rail second sword (4) relative to the chain sword (2) or the housing (1) - has a sliding or hinged attachment and in - the workflow adapted each - specific positions can be determined.

9. chainsaw according to claims 1 to 8, characterized in that a second - the saw chain preferably three sides so on both sides and bottom enclosing - protective rail (62) is provided which is mounted along the saw chain in the working area of the same slidably movable and manually or by means of motor or electromechanical force effect, releasing the chain working range, into a housing region (66) of the chain saw which is adapted to the protective rail and shaped accordingly.

10. chainsaw according to claims 1 to 9, characterized in that it comprises a second chain wheel (44) in the deflection of the saw chain, which in there located on the chain sword (2) and / or on the second, designed as a guard rail sword (4) mounted on the chain tag (2) and / or on the second blade (4) mounted side plates or plates.

11. A chain saw according to claim 10, characterized in that in the region of the protective cap (3) in the chain deflection region, a chain tensioning device (2) or the second blade (4) is provided as an abutment.

12. chainsaw according to claims 1 to 11, characterized in that the working area of the saw chain, a portion of the chain sword and the protective device by means of side plates (61) is covered, which slightly above the chain teeth of the work area (down) and which by means of swivel (12) are pivotable in an approximately perpendicular to the chain sword position - in particular upwards.

13. chainsaw according to claims 1 to 12, characterized in that a part of the inside of the bracket (5) located work area to slightly above the returning chain (15) of the work area also by releasably mounted sliding plates (48) or side plates - at least one-sided - is covered.

14. Chainsaw according to claims 1 to 13, characterized in that the guided along the leading saw chain (14) guard in particular additionally - a shock protection body (21), which is located on the upper edge along the second sword (4) and flexible, elastic, articulated and against heavy contact is yielding and preferably in a longitudinal groove on trained as a guard rail second sword (4) is attached.

15. chainsaw according to claims 1 to 14, characterized in that the functional parts of the protective device such as the second sword (4) and the guard (5) exclusively on the chain sword (2), exclusively on the housing (1) or on the chain sword and the housing - Preferably releasably - are attached.

16. chainsaw according to claims 1 to 15, characterized in that the functional parts of

Protection device such as second sword (protective rail) (4), protective cap (3) or guard (5) are designed as a material coherent body, wherein the chain sword initially arranged parts such as second sword (4) and protective cap (3) directly or by means of at least one side of the chain bar (2) mounted side flanges (51) are attached.

17. chainsaw according to claims 1 to 16, characterized in that the protective device (4) consists of two hinged half shells, which preferably have below the return to the housing chain (15) joints or hinges (38), on the opposite side Above the leading chain (14) - preferably by means of quick release (39) - positively connected or closed and in holes in the chain bar (2) by means of screws, pins or studs (40) are fixed.

18. chainsaw according to claims 1 to 17, characterized in that the functional parts of the protective device such as guard (5) protective rail (4) and / or protective cap (3) on the chain deflection area as a unit of material contiguous from a one-sided on chain link and chain, consist of molded shaped, preferably releasably attached to the chain blade side plate.