EP2353171B1 - Operating device for manually actuating lifting devices - Google Patents

Description

The invention relates to a hand-operated control unit of a hoist, comprising at least one arranged in a switch housing switching element, the switching element comprises a protruding from the switch housing and guided in a sleeve plunger, which is covered by a cover member, wherein the sleeve through an opening in the switch housing protrudes outwardly, and the cover member is connected to the sleeve, wherein the sleeve has an outwardly extending collar which is supported in the assembled state on an outer surface of the switch housing and the sleeve via a fastening ring, which in the assembled state on an inner surface of the switch housing supported, releasably held on the switch housing.

From the German patent application DE 103 31 130 A1 is a switch for the manual operation of lifting equipment known. The switch has a switch housing, in which a plurality of spring-loaded switching elements - for example, for the functions lifting and lowering a hoist - are arranged. Each switching element consists of an electrical button and a mechanical pressure switch for its operation. The mechanical pressure switch is essentially composed of a switch plunger and a sleeve. In the sleeve of the switch plunger is guided for actuation of the trained as a micro switch electrical button. The switch plunger is supported on the button or a bottom of the switch housing via a spring element in the form of a spiral spring. The pressure switch can be designed in one or more stages, ie, starting from an off position, the switch plunger is movable into a first on position and subsequently into at least one further on position. Accordingly, corresponding electrical push-buttons or multi-stage push buttons are then actuated via the switch plunger in each of the on positions. In the off position, the switch plunger protrudes farthest out of the sleeve and is then moved toward the sleeve to reach the first and further on positions, respectively. In the final on position, the switch plunger still protrudes out of the sleeve by a thumb of an operator.

In the context of industrial applications, it is important that between the off position and the respective on positions, the operator must travel an operating path - for example, with his thumb - in order to be able to operate the switch safely even with gloves. It is also important that the switching elements automatically return to the off position, so that the controlled movement is activated only as long as the operator holds the switching element against its restoring force in the on position.

The embodiment of this publication shows a section of a switch housing with two switching elements, each formed in two stages. Thus, hereby a hoist in the lifting and lowering direction and by the two-stage per switching element in a first ON position - slow speed - and a second ON position - high speed can be controlled. Also, such switches are used for the control of traction drives or cranes.

The mechanical pressure switches are each attached via the sleeve to the switch housing. For this purpose, each circular openings are provided in a front surface of the switch housing, in which the pressure switches are inserted from the outside. So that the pressure switches do not slip through the opening in the interior of the switch housing during assembly, the sleeves of the pressure switch at its outer end a circumferential and outwardly facing collar which comes to rest on the front surface of the switch housing. To attach the pressure switch to the switch housing, the inner end of the sleeve is provided with an external thread. On the external thread a fastening ring is screwed in the manner of a nut, which comes to rest on the inside of the front surface of the switch housing and thus pulls the collar on the front surface of the switch housing.

In industrial applications, the electrical buttons and pressure switches are more conveniently installed in a switch housing that is sealed to protect against external aggressions and contamination. In addition, the switch housing is designed so that the switching plunger protrude from the switch housing and thus there is scope for the actuation of the push-button.

In order to seal the switch plunger projecting out of the switch housing with respect to the sealed switch housing, the switch plungers are surrounded by a flexible cover element in the manner of a protective cap, which is tightly connected to the switch housing. For this purpose, the cover element is formed with a round connection opening. Seen in cross-section, the cover has an approximately frustoconical cross-section, wherein the smaller base rests on the switch plunger and the larger base is directed to the connection opening. In the region of the connection opening, the cover element has an inwardly pointing edge which extends parallel to the smaller base surface of the cover element. This edge is dimensioned so that it has approximately the dimensions of the switch housing facing the sealing surface of the collar of the sleeve. Before the push-button is inserted into the opening of the switch housing, the cover element is slipped over the collar of the sleeve, then the sleeve of the push-button inserted into the round opening of the switch housing and then tightened from the inside of the mounting ring. The edge of the cover member is thereby clamped between the front surface of the switch housing and the sealing surface of the collar and thus the opening of the switch housing tightly closed. In order to prevent the edge from slipping outwardly out of the region between the collar and the front surface, the front surface springs back in the form of an annular recess in which the outer circumference of the edge of the cover element abuts.

Furthermore, from the Spanish utility model ES 101 83 51 U another switch for the manual operation of hoists known, which also have arranged in a switch housing switching elements with electrical buttons and a mechanical pressure switch. The mechanical pressure switch also has a switch plunger and a sleeve in which the switch plunger is guided for actuation of the electrical button. In addition, the pushbutton is here sealed with a flexible cover member relative to the switch housing. Before the flexible cover member is mounted, the externally threaded sleeve is screwed into an opening in the front surface of the switch housing from the inside, until a sealing ring abutting an outer edge of the sleeve comes to rest on the inside of the front surface of the switch housing , Subsequently, the cover member is externally applied to the protruding from the front surface of the switch housing rest of Screwed external thread of the sleeve until the cover element comes to flat contact on the front surface of the switch housing. For this purpose, the cover member in the region of its connection opening on an inwardly directed circumferential groove, in which a connecting ring is inserted, which has an internal thread.

In connection with the mounting of the cover member is important that when installing the pressure switch in the switch housing from the inside the sleeve is tightened with a sufficient moment so that both the pressure on the sealing ring is sufficient and the screw against loosening, especially when screwing the cover member of outside, is secured.

Experience has shown that the protective caps of the switching elements are exposed to special stresses and must be replaced more frequently due to wear.

The European patent application EP 1 345 188 A2 discloses an actuatable via a plunger indicator light. The plunger carries a light-emitting diode and is sealed to the outside via a cover element. For attachment of the cover element is an actuating attachment with a first sleeve, which is attached to a mounting wall of the indicator light. About a threaded ring, the cover member is screwed to the first sleeve. The plunger is guided in a second sleeve, which is arranged within the first sleeve of the actuating attachment.

From the publication US Pat. No. 2,795,144 For example, a cover element is known for the moisture-tight sealing of the tappet of a switching element of an aircraft, vehicle or ship. The switching element has a mounting wall, on whose outer surface a sleeve-shaped shoulder is arranged with an external thread. The plunger is passed through the mounting wall and the heel and thereby covered by the cover member. For releasable attachment to the mounting wall, the cover element comprises a threaded ring, via which the cover element is screwed onto the shoulder. The publication US 4 298 778 A describes a comparable seal of a plunger of a switching element with a cover element.

Based on this, the present invention seeks to provide a hand-operated control unit of a hoist, in which the cover elements of the switching elements are easy to assemble and replace.

This object is achieved by a hand-operated control unit of a hoist with the features of claim 1. Advantageous embodiments of the invention are specified in claims 2 to 11.

According to the invention, in a hand-operated control unit of a hoist, comprising at least one arranged in a switch housing switching element, the switching element comprises a protruding from the switch housing and guided in a sleeve plunger, which is covered by a cover member, wherein the sleeve through an opening in the switch housing protrudes outwardly, and the cover member is connected to the sleeve, wherein the sleeve has an outwardly extending collar which is supported in the assembled state on an outer surface of the switch housing and the sleeve via a fastening ring, which in the assembled state on an inner surface of the switch housing supported, releasably held on the switch housing, a simple assembly and interchangeability of the cover elements of the switching elements is achieved in that the cover member is fixed to a threaded ring, the sleeve has a first external thread and a second it has external thread, the first external thread and the second external thread are separated from the collar, in the assembled state of the fastening ring is in engagement with the first external thread and in the assembled state of the threaded ring is in engagement with the second external thread and the collar in the assembled state on an outer surface of the Switch housing rests.

The opening of the switch housing to replace a cover member can be avoided. This opening is otherwise a special effort and must be carried out with particular care by a specialist, so that no damage to the built electrical components and the switch housing after assembly has the required sealing effect. To carry out this work, the switch must be dismantled at the place of use and taken to a repair workshop Cover element, the sleeve over the mounting ring securely held in the switch housing. Likewise, the switching element is securely held in the switch housing. This facilitates the assembly. Furthermore, the switching element remains functional even without cover element.

According to the present invention, the switch housing no longer has to be opened, the repair can be carried out at the place of use of the operating device by removing a damaged cover element and replacing it with a new one.

Particularly advantageously, the sleeve is secured against rotation relative to the switch housing. Preferably, for this purpose, the sleeve in the region of the collar on a radially outwardly projecting nose, which engages in a recess which is arranged in the switch housing. By this rotation is achieved that the mounting of the cover member does not solve the screw of the sleeve with the switch housing on the mounting ring or loosens.

In this case, the threaded ring of the cover element is advantageously supported in the assembled state on an outer surface of the switch housing.

In one embodiment, it is provided that the cover element is formed hat-shaped with a connection ring, the threaded ring is surrounded by the connection ring and a part of the connection ring between the outer surface of the switch housing and the threaded ring is clamped, whereby the sealing takes place. Furthermore, a secure bond between threaded ring and connecting ring is ensured.

Furthermore, the threaded ring may also have external teeth around the outside and the connection ring inside an internal toothing. As a result, a secure transmission of the assembly forces is achieved by the mounting tool via the connecting ring on the threaded ring.

It is particularly advantageous that the switch housing in the region of the opening for the switching element has a recess with a peripheral wall, which is opposite to a lower part of the connecting ring. Thus, it can be prevented that connection ring is pushed out from under the threaded ring and the desired Sealing is lost.

Since the cover element has an external profile (for example toothing) in the region of its connection ring for an assembly tool, the cover element can easily be screwed onto and detached from the sleeve. The assembly tool has a corresponding inner profile (e.g., gearing) for cooperation with the outer profile. In this case, the outer profile on the connection ring can be easily reached by the installation tool, since the outer profile is also arranged on the connection ring outside the region of the connection ring opposite the peripheral wall in the assembled state. The required torques for the threaded ring can thus be applied safely. Also can be mounted or dismounted with the mounting tool in the manner of a socket wrench a cover element, which is surrounded by adjacent switching elements and formations of the switch housing. The switch housings have the formations to provide protection against accidental actuation of the switching elements. To achieve this protection, the switching elements are recessed in the formations of the switch housing in the form of wells installed. Again, the cover elements are easy to handle with the mounting tool.

In addition, it is provided that the cover element in the region of its connection ring in the direction of the switch housing is increasingly conical. The positive connection between the assembly tool and connecting ring is thus reinforced by pressing the mounting tool in the direction of the cover member.

Advantageously, it is provided that the connecting ring has an internal toothing, which is in engagement with an external toothing of the threaded ring. Thus, the assembly forces can be safely transmitted from the mounting tool via the connecting ring on the threaded ring.

Advantageously, it is provided that the cover element is secured to the switch housing via an adhesive or adhesive bond.

With respect to a tool for mounting and dismounting the above-described cover member of the operating device, it is proposed that the Inner profile of the tool in the axial direction of actuation of the switching element is conical.

According to the formation of the cover member may be provided in each case advantageously that the tool in the manner of a socket wrench has a complementary to the outer profile of the connection ring formed inner profile that the tool surrounds the cover member during assembly, and / or that the inner profile is formed as a toothing , wherein preferably the flanks of the toothing are formed steeper in disassembly direction.

• Figur 1 eine Draufsicht auf ein erfindungsgemäßes Bedienungsgerät für die Handbetätigung von Hebezeugen,
• Figur 2 eine Ansicht von Figur 1 entlang der Schnittlinie I-I,
• Figur 3 eine Ausschnittsvergrößerung von Figur 2 aus dem Bereich eines Schaltelementes und
• Figur 4 eine perspektivische Detailansicht von Figur 2 mit einem Abdeckungselement eines Schaltelementes zusammen mit einem Montagewerkzeug.

Hereinafter, an embodiment of an operating device according to the invention for the manual operation of lifting equipment will be described in detail with reference to a drawing. Show it:

• FIG. 1 a top view of an inventive operating device for the manual operation of lifting equipment,
• FIG. 2 a view of FIG. 1 along the section line II,
• FIG. 3 an excerpt from FIG. 2 from the range of a switching element and
• FIG. 4 a detailed perspective view of FIG. 2 with a cover element of a switching element together with a mounting tool.

The FIG. 1 shows a plan view of an inventive control unit 1 for the manual operation of lifting equipment. The operating device 1 is used for manual control of the movements of a crane. For this purpose, the control unit 1 is connected via a non-illustrated electrical cable with a crane control or can be wirelessly connected, for example via a radio link with the crane control. Also referred to as a control switch control unit 1 has a total of six switching elements 2, which are installed in a switch housing 3. Of the six switching elements 2, only one flexible and cap-shaped cover element 4 can be seen in each case. Each cover member 4 has a planar actuating surface 4a, preferably by a thumb of the operator is operable. On the actuating surface 4a, a symbol support member 5 is fixed, which is preferably designed as a sticker.

It is also conceivable to form the symbol carrier element 5 as a round or square badge which is glued to the actuating surface 4a or clamped in correspondingly provided grooves. In this case, the grooves are preferably endlessly encircling in order to ensure a secure hold of the symbol carrier element 5.

The in the FIG. 1 shown switching elements 2 are used for manual control of the drives of a crane. The six switching elements 2 are arranged side by side in pairs and the resulting three pairs with each other. The top two switching elements 2 serve to control the lifting and lowering of a chain or cable; the middle two switching elements 2 serve to move the chain or cable along a carrier by means of a drive in two directions.

Of the two lower switching elements 2, the left is occupied with a warning signal and the right with an emergency stop function. The upper four switching elements 2, with which the drives of the crane are controlled, are designed as so-called two-stage switch, d. H. In addition to an off position, there is a first on position and a second on position, in which each drive can be controlled in one direction of travel in two speeds. In principle, it is also possible to form the switching elements 2 so that hereby drives can be steplessly controlled.

The FIG. 2 shows a view of FIG. 1 along the section line II and thus the two middle switching elements 2 for the driving movement of the chain or cable in its both directions along a rail. These two switching elements 2 serve to activate the two possible different directions of movement of the hoist, namely left and right.

For safety reasons, the switching elements 2 of an operating device 1 for the manual operation of lifting devices are designed so that an actuated switching element 2 is immediately transferred back to the off position as soon as no pressure is exerted on the switching element 2. For this purpose, each switching element 2 via a Spring element 6 biased in the direction of the switched-off basic position.

Like from the FIG. 2 Furthermore, it can be seen, each of the two switching elements 2 consists of an electrical first micro-switch 7 and an upstream pressure actuation mechanism 8, via which the first micro-switch 7 can be actuated. The commercial first micro-probe 7 is soldered directly onto an electrical circuit board 9, which is supported in the switch housing 3. A micro-stylus is understood to mean a miniaturized switching element for switching signal currents with spring-loaded electrical contacts, which is switched by short-stroke tactile confirmation. Micro pushbuttons are ideally suited to be mounted on electrical circuit boards automatically and take up little installation space.

As a result of this spatial separation of the actual electrical switching via the first micro-switch 7 from the mechanical switching via the pressure-actuation mechanism 8, it becomes possible to use micro-switches 7 which require only small switching paths and low switching forces. The prescribed for a reliable operation large shift travel of at least about 5 mm, clearly distinguishable detent positions for fast and slow running and well noticeable switching forces can be easily and inexpensively generated in this embodiment via the kinematics of the micro switch 7 upstream pressure actuation mechanism 8.

The illustrated embodiment of an operating device for the manual operation of lifting equipment is further configured so that the pairs of upper and middle switching elements 2 in addition a further common second electrical micro button 10 is assigned, via a high-speed running movement of the chain or cable for the respective direction of movement is activatable. This common second micro button 10 is actuated by the respective pressure actuation mechanism 8 for the desired direction of movement. It is of course also possible to associate each switching element 2 with its own second micro-probe 10.

In any case, the pressure actuation mechanism 8 is designed so that the second micro-probe 10 can be activated in chronological order only after the activation of one of the first micro-switches 7, that is, the hoist only in the slow Lifting or lowering operation or driving operation can be switched before the high-speed operation can be switched on by activating the second micro-push button 10.

To perform the successive switching function, namely the actuation of the electric first micro-probe 7 of the switching element 2 on the one hand and the subsequent actuation of the second micro-probe 10 on the other hand, the pressure actuation mechanisms 8 of the switching elements 2 each consist of a via the spring element 6 relative to the associated electrical switching means in the form of first micro-switch 7 of the switching element 2 prestressed plunger 11 and a guide 12 mounted in a bore 12 of the plunger inner plunger 13, wherein the inner plunger 13 is supported via a bore 12 mounted in the spring element 14 on the plunger 11. Here, the inner plunger 13 is mounted coaxially displaceable in the plunger 11.

• Beim Ausüben einer Druckkraft auf das ein Schaltelement 2 überdeckendes Abdeckungselement 4 wird der Druck auf den Stößel 11 der Druckbetätigungsmechanik 8 übertragen und der Stößel 11 gegen die Rückstellkraft des Federelements 6 in Richtung auf den zugehörigen elektrischen ersten Mikrotaster 7, insbesondere dessen Schaltstößels 15, des Schaltelementes 2 bewegt. Der über das Federelement 14 in dem Stößel 11 gelagerte Innenstößel 13 wird bei dieser Bewegung unbelastet mitgenommen, bis der Innenstößel 13 mit einer Anlagefläche 13a gegen den ersten Mikrotaster 7 beziehungsweise dessen Schaltstößel 15 anläuft und dieses die elektrische Schaltung auslösend aktiviert. Der Innenstößel 13 ist hierbei koaxial zu dem Schaltstößel 15 des ersten Mikrotasters 7 gelagert.

The operation of the above-described operating device 1 for the manual operation of hoists is done as follows:

• When exerting a compressive force on a switching element 2 overlapping cover member 4, the pressure on the plunger 11 of the pressure actuation mechanism 8 is transmitted and the plunger 11 against the restoring force of the spring element 6 in the direction of the associated electrical first micro-probe 7, in particular its switch plunger 15, the switching element 2 moves. The inner plunger 13, which is mounted in the plunger 11 via the spring element 14, is taken unloaded during this movement until the inner plunger 13 starts against the first micro button 7 or its switch plunger 15 with a contact surface 13a and this activates the electrical circuit. The inner plunger 13 is in this case mounted coaxially with the switch plunger 15 of the first microprobe 7.

If now further pressure is exerted on the plunger 11 of the pressure actuation mechanism 8, this pressure causes the spring element 14 to be compressed via the inner plunger 13 bearing against the first micro button 7, so that the plunger 11 is further pressed against the restoring force of the spring element 6 into the switch housing 3 is until a contact surface 11 a of the plunger 11 starts against the switch plunger 15 of the second micro-probe 10 and so activates the high-speed.

In order to prevent the ingress of moisture and / or dirt into the switch housing 3, the pressure actuation mechanisms 8 are opposite to the switch housing 3 with the already in FIG. 1 shown flexible cover member 4 sealed in the manner of a protective cap to the outside. The cover element 4 is a hat-shaped or truncated cone-shaped part with a planar actuating surface 4a, to which a circumferential and conically widening in the direction of the switch housing 3 side wall 4b made of elastic plastic connects. The actuating surface 4a is formed as a circular, hard cover made of plastic or metal and intimately connected to the material of the side wall 4b and rests on the plunger 11 of the pressure actuation mechanism 8. The actuating surface 4a receives the actuating force when pressing the pressure actuation mechanism 8 and its plunger 11, and is at the same time carrier for the symbol carrier element 5, with which the control command associated with the switching element 2 is symbolized.

The cover element 4 has at its the actuating surface 4a opposite end a circular connection opening 16 which is bounded by a circumferential connection ring 4c. The connecting ring 4c adjoins the end of the side wall 4b opposite the actuating surface 4a and extends inwardly in the direction of the connection opening 16 from the side wall 4b. The connecting ring 4c thus forms a planar annular sealing surface 4d facing the switch housing 3 and an opposite one also flat annular and the switch housing 3 remote terminal surface 4e. The sealing surface 4d and the connecting surface 4e are opposite and are facing away from each other.

Furthermore, the connection ring 4c encloses a U-shaped or L-shaped threaded ring 17, which has a substantially rectangular cross-section and on its inner circumference has an internal thread 17a. The threaded ring 17 is positively received and held in the elastic terminal ring 4c of the cover member 4.

For fixing the switching elements 2 in the switch housing 3 six circular openings 18 are arranged in a front surface 3a of the switch housing, in which the pressure actuating mechanism 8 is inserted from the outside. The pressure actuation mechanism 8 has for this purpose a cylindrical sleeve 19, in the the plunger 11 is slidably guided and held between its end positions. Thus, the sleeve 19 is not pushed from the outside through the respective opening 18, this has in the central region a circumferential and annular collar 19a. The sleeve 19 radially outwardly extending collar 19a thus forms a second annular surface 19b, which comes in the installed state of the switching element 2 on the outer surface 3c of the front surface 3a, which limits the opening 18 for the sleeve 19, for conditioning.

In order to hold the pressure actuation mechanism 8 in the respective opening 18, the region of the sleeve 19 which adjoins the collar 19a and extends inwards over the inner surface 3b of the front surface 3a of the switch housing 3 has a first external thread 19c. The sleeve 19 is therefore at the same time a housing bushing for the plunger 11. On the first external thread 19c of the sleeve 19 is a mounting ring 23 with its internal thread 23a. The fastening ring 23 is stepped in cross-section and divides into a first ring portion 23 c and a second ring portion 23 d (see FIG. 3 ). Here, the first ring portion 23c has a smaller diameter than the second ring portion 23d. The diameter of the first ring portion 23 c is selected so that its internal thread 23 a to the first external thread 19 c of the sleeve 19 fits. Furthermore, the diameter of the second ring section 23d is selected such that its contact surface 23b is opposite the connection ring 4c of the cover element 4 and rests against the inner surface 3b of the switch housing 3 along its entire circumference. A recess 25 for a nose 24 is thus only slightly covered.

By the screwed fastening ring 23 of the collar 19a is pressed with its annular surface 19b to the outer surface 3c of the front surface 3a of the switch housing 3 and pressed the mounting ring 23 with its contact surface 23b on the inner surface 3d of the switch housing 3. Here, the inner surface 3b of the front surface 3a, the outer surface 3c of the front surface 3a, the annular surface 19b of the collar 19a, and the abutment surface 23b of the fixing ring 23 are respectively aligned substantially parallel to each other.

Furthermore, the region of the sleeve 19 which adjoins the collar 19a and which projects outward beyond the outer surface 3c of the front surface 3a of FIG Switch housing 3 also extends, a second external thread 19d. On the second external thread 19 d of the sleeve 19, the cover member 4 is screwed with its threaded ring 17. As a result, the sealing surface 4d of the connection ring 4c is pressed onto the outer surface 3c of the switch housing 3, and the threaded ring 17 is pressed onto the connection surface 4e of the connection ring 4c. Here, the sealing surface 4d of the terminal ring 4c, the outer surface 3c of the switch housing 3, the pressing surface of the threaded ring 17 and the terminal surface 4e of the terminal ring 4c are respectively aligned substantially parallel to each other. The opening 18 is thus sealed by the cover member 4 with the threaded ring 17.

This structural design, the functions of mechanical attachment of the switching element 2 in the switch housing 3 and sealing of the switching element 2 with respect to the switch housing 3 are separated. The fastening ring 23 takes over the mechanical fastening and the threaded ring 17, the seal.

The FIG. 3 shows an enlarged detail of FIG. 2 From the area of the left switching element 2 and the associated cover element 4 with the threaded ring 17. From this enlargement is better seen that the front surface 3a of the switch housing 3 in the region of the openings 18 for the switching elements 2 circular and at the edge of the openings 18th has subsequent recesses 20 which are delimited by a circumferential wall 3d, which extends at right angles and upwards from the outer surface 3c. The inner diameter of the recesses 20 is dimensioned such that it is approximately equal to or slightly larger, ie up to about 1 mm, preferably 0.15 mm, than the outer diameter of the connecting ring 4c. This small clearance effectively prevents the terminal ring 4c from slipping under the threaded ring 17. The depth of the recess 20 is selected so that about half of the connecting ring 4c protrudes from the recess 20 upwards.

Further, the front surface 3a of the switch housing 3 is provided with a circumferential, trapezoidal projection 22, which "digs" from below during assembly in the cover member 4 in the region of the sealing surface 4d, so that the cover member 4 is fixed horizontally in position.

Also is from the FIG. 3 to recognize that the threaded ring 17 seen in the longitudinal direction of the sleeve 19 at its top and its underside each have a radially circumferential groove 17c, which has a rounded trapezoidal cross-section. Correspondingly, protruding out of the sealing surface 4d of the cover element 4 is a complementarily formed bead 4i with a rounded trapezoidal cross section, which engages in the assembled state of the cover element 4 in the groove 17c of the threaded ring 17 in a form-fitting manner.

In addition, it can be provided that the cover element 4 is secured to the switch housing 3 via an adhesive or adhesive bond. In particular, such an adhesive or adhesive connection between the sealing surface 4 d of the cover member 4 and the outer surface 3 c of the switch housing 3 is provided.

The FIG. 4 shows a detailed perspective view of a cover member 4 and a section of a front surface 3a of a switch housing 3 together with a mounting tool 21. It can be seen that the connection ring 4c is formed in its upper region not surrounded by the wall 3d of the recess 20 with an outer profile 4f. The assembly tool 21 has, in the manner of a socket wrench to the outer profile 4f complementarily formed inner profile 21a to the cover member 4 easy to unscrew the second external thread 19d of the sleeve 19 and to be able to solve for an exchange again. About the mounting tool 21, which encloses the cover member 4 during assembly, so the required torque for the secure attachment of the cover member 4 and sealing of the switch housing 3 can be applied and transmitted to the inner threaded ring 17. To prevent twisting of the sleeve 19 when screwing the cover member 4, the sleeve 19 has a nose 24 (see FIG. 4 ) adjacent to the collar 19 a, which engages to prevent rotation in a corresponding recess 25 on the switch housing 3 in the region of the opening 18. The nose 24 is in the plan view, that is seen in the longitudinal direction of the sleeve 19, formed triangular and extends with its tip radially outward from the sleeve 19 away. In comparison with the circumferential collar 19a, the nose 24 projects many times more out of the surface of the sleeve 19. The nose 24 adjoins the recess 25. Furthermore, the recess 25 has a shape complementary to the nose 24 on, so that the nose 24 is held almost positively in the recess 25. In order to facilitate the assembly, a clearance in the form of a gap remains between the nose 24 and the recess 25.

The assembly tool 21 is preferably made of plastic by injection molding and is coaxial with the operating direction of the switching element 2 with only a small footprint placed on the cover member 4. Thus, the assembly is easily possible even with side by side in recesses 20 arranged switching elements 2. The inner profile 21 a and the outer profile 4 f are conically formed in the axial direction of actuation of the switching element 2 in order to reinforce the transferable with the mounting tool 21 in the circumferential direction forces by axial pressure can.

Advantageously, the inner profile 21 a and the outer profile 4f are formed as toothings, wherein preferably the flanks of the toothing in the disassembly direction formed steeper, in order to be able to apply a larger force with the mounting tool 21 during disassembly of the cover elements 4.

Furthermore, the FIG. 4 can be seen that the threaded ring 17 outside circumferentially an external toothing 17b and the connecting ring 4c inside an internal toothing 4g. As a result, a secure transmission of the assembly forces is achieved by the mounting tool 21 via the connecting ring 4c on the threaded ring 17.

In principle, it is also possible to dispense with the inner profile 21a of the assembly tool 21 and the outer profile 4f of the cover element 4 and form the mounting tool 21 and the cover member 4 in the axial direction of actuation of the switching element 2 increasingly conical.

In addition to the possibility shown, it is also possible to form the second micro-probe 10 by a cooperating with a magnet Hall sensor for continuous speed control of the drives of a hoist in the second switching stage. From the DE 44 12 557 C2 Such a special component for converting the actuation path into an electrical signal is known.

As a preferred application for such a two-stage switch wireless or wired hand control devices for cranes, construction machinery or similar industrial machines are specified.

LIST OF REFERENCE NUMBERS

1

operating device

2

switching element

3

switch housing

3a

front surface

3b

palm

3c

outer surface

3d

wall

4

cover member

4a

actuating surface

4b

Side wall

4c

Attachment ring

4d

sealing surface

4e

terminal area

4f

outer profile

4g

internal gearing

4i

bead

5

Symbol support element

6

spring element

7

first electrical micro switch

8th

Pressure actuating mechanism

9

electrical circuit board

10

second electrical micro switch

11

tappet

11a

contact surface

12

drilling

13

interior follower

13a

contact surface

14

spring element

15

switching plunger

16

port opening

17

threaded ring

17a

inner thread

17b

external teeth

17c

groove

18

opening

19

shell

19a

collar

19b

annular surface

19c

first external thread

19d

second external thread

20

recess

21

assembly tool

21a

internal profile

22

head Start

23

fixing ring

23a

inner thread

23b

contact surface

23c

first ring section

23d

second ring section

24

nose

25

recess

Claims (11)

1. Manually actuatable control device (1) for a lifting device, having at least one switching member (2) arranged in a switch housing (3), the switching member (2) comprises a plunger (11) which projects from the switch housing (3) and is guided in a sleeve (19) and which is covered by a cover member (4), the sleeve (19) projecting outwards through an opening (18) in the switch housing (3), and the cover member (4) is connected to the sleeve (19), the sleeve (19) having an outward extending collar (19a) which is supported against an outside surface (3c) of the switch housing (3) in the fitted state, and the sleeve (19) being detachably held to the switch housing (3) by means of a fastening ring (23) which is supported against an inside surface (3b) of the switch housing (3) in the fitted state, characterised in that the cover member (4) is fastened to threaded ring (17), the sleeve (19) has a first outside thread (19c) and a second outside thread (19d), the first outside thread (19c) and the second outside thread (19d) are separated from one another by the collar (19a), the fastening ring (23) is in engagement with the first outside thread (19c) in the fitted state and the threaded ring (17) is in engagement with the second outside thread (19d) in the fitted state, and the collar (19a) rests against an outside surface (3c) of the switch housing (3) in the fitted state.
2. Control device according to claim 1, characterised in that the sleeve (19) is secured against rotation relative to the switch housing (3).
3. Control device according to claim 2, characterised in that, in the region of the collar (19a), the sleeve (19) has a nose (24) which projects out radially and which engages in a recess (25) arranged in the switch housing (3).
4. Control device according to one of claims 1 to 3, characterised in that the threaded ring (17) of the cover member (4) is supported on an outside surface (3c) of the switch housing (3) in the fitted state.
5. Control device according to one of claims 1 to 4, characterised in that the cover member (4) is of a hat-like form and has a connecting ring (4c), the threaded ring (17) is surrounded by the connecting ring (4c), and part of the connecting ring (4c) is clamped between the outside surface (3c) of the switch housing (3) and the threaded ring (17).
6. Control device according to claim 5, characterised in that, in the region of the opening (18) for the switching member (2), the switch housing (3) has a recess (20) having a surrounding wall (3d) which is situated opposite a lower part of the connecting ring (4c).
7. Control device according to one of claims 1 to 6, characterised in that, in the region of its connecting ring (4c), the cover member (4) has external profiling (4f) for a fitting tool (21).
8. Control device according to claim 7, characterised in that the external profiling (4f) is arranged on the connecting ring (4c) away from that region of the connecting ring (4c) which is situated opposite the surrounding wall (3d).
9. Control device according to one of claims 1 to 8, characterised in that, in the region of its connecting ring (4c), the cover member (4) is of an increasingly conical form in the direction of the switch housing (3).
10. Control device according to one of claims 5 to 9, characterised in that the connecting ring (4c) has a set of internal teeth which are in engagement with a set of external teeth on the threaded ring (17).
11. Control device according to one of claims 1 to 10, characterised in that the cover member (4) is secured to the switch housing (3) by means of an adhesive-bonded or interference joint.

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