DE2507168A1 - ROTATING SEAT CONTROL UNIT - Google Patents

Description

Daimler-Benz Aktierige-; e.lxschaf ⁺ 9 h Q ", ''] β β

Stuttgart-Untertürkheim _ · - · ·

Daim Io

18.2.75

Rotatable control unit

The invention relates to a rotatable seat control unit a commercial vehicle with a locking device, which has a cone which is pressed into a corresponding recess under the pressure of a spring and thereby a safeguarding of seat operating sex against twisting represents which safeguard can be abolished by pressure against the spring. can do.

With DreiiDare seat control unit becomes an arrangement a driver's seat, which is arranged on a rotatable platform of a vehicle, because »with work equipment, in particular agricultural equipment, can be equipped as a device carrier. The seat controls control unit also includes the steering wheel and the

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control levers such as the foot brake pedal, the clutch pedal and the foot lever for speed adjustment and the like. It is usually so that the seat control units to the vertical steering column is swiveled around. But you can also depending on the design requirements have a different pivot point. The seat operating unit must, since it is around any, but structurally defined Angle is pivotable, Xn the respectively desired position relative to the other parts of the vehicle, in particular opposite the driver's cab. This is done, for example, via a conical bottom Spring-loaded pin that can snap into a corresponding conical recess.

If the seat control unit is now to be unlocked and pivoted, a hand lever is pressed and the conical pin is lifted out of the recess in the cab floor against the spring pressure and the The seat control unit can be pivoted through a desired angle. After the pivoting, the conical Snap the pin back into place under the pressure of the spring and the seat control unit is locked. If a seat control unit is only available with the locking mechanism just described provided, which can be unlocked at any time, then the seat control unit could also be used when the Handbrake, or the like while the engine is running.

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However, this brings with it dangers that impair the safety of the vehicle, which is usually not on the road anyway. For example, when the vehicle is inclined, it is not possible to use the seat control unit together with the driver's weight «to compensate moderately, which means that if a Such pivoting also happens while driving, accidents can easily occur.

The object of the invention is to avoid these dangers and to provide a seat bed with a lock provided that allows pivoting only when the conditions required for safety, namely tightened Parking brake, switched off engine or the like. Are guaranteed.

These conditions are met by the invention, which is that a second locking device with a also the locking cone is provided, which engages by a spring and only comes out of its locking can be removed when the parking brake is applied and at least one other condition is met, for example, the engine is turned off.

In a further embodiment of the invention, the locking device Depending on the running of the engine and the position of the locking lever, hydraulic or with Compressed air can be controlled. For this purpose, a cyclic

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have at least two valves with a pressure line leading the cone into its detent, whose adjustment depends on the one hand on the running of the engine and on the other hand on the position of the parking brake lever.

In detail, the seat control unit can be designed so that a valve is arranged in the pressure line, which closes the line section between the compressed air tank and itself and that through an organ to control the injection pump in its stop position is switched to continuity. On the other hand, in the seat control unit can be arranged in the pressure line, a second valve that it with a spring accumulator vented for the actuation of the second locking device connecting line section and switches to passage when the parking brake is applied.

The seat control unit with the locking device is in a vehicle whose parking brake is on Spring accumulator acting pressure is released, which in the unpressurized state under the action of compression springs sets the brake, expediently designed so that the second Valve is actuated by a pressure line which, when the parking brake is released, pressure from the parking brake valve sum second valve conducts and thereby the line section

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between him and the spring accumulator for the locking device vented, while the second valve in the unpressurized state of the pressure line by a spring on passage is provided.

The safety device can also be designed in such a way that an engine that is still running is switched off when the first lock is activated. For this purpose, the seat control unit can be designed so that with the first locking device in a line connecting the pressure vessel to a spring accumulator arranged valve is connected, the line section in the locked position of the locking device between itself and the pressure vessel shut off and at the same time the line section between itself and the The spring accumulator is vented and, in the unlocked position, connects the two line sections to one another, so that the Spring accumulator against the pressure of the fields located in it can move a plunger, which the organ for the Brings control of the injection pump to the stop position. In this position, the first valve is also open Passage switched, so that when the parking brake is also applied and thereby the second valve in Has been brought through position, the spring accumulator can be operated, which the cone of the second locking device lifts out of its recess.

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In addition to the condition that the parking brake must be applied and the engine is no longer running, or instead of the condition that the engine is no longer running, Their conditions are given and must be met if the second locking device is to be released.

In this case, too, the seat control unit belongs to a vehicle whose parking brake is released by pressure acting on the spring accumulator, which is in a pressureless state Apply the brake under the action of compression springs. The other conditions, for example the Interruption of the power flow in the gearbox or otherwise can be met by an electrical switch that switches to a solenoid valve built into a pressure line acts, which on the one hand transfers the pressure coming from a reservoir a valve that is dependent on the position of the first locking device gets and, on the other hand, when it is induced Solenoid valve forwards this pressure to another valve, which when the parking brake is engaged Pressure to a cylinder with a spring pressing the cone of the second locking device in its detent conducts, while it is actuated by a spring when the parking brake is free, venting the line leading to it. If further conditions are to be met before the second locking device can be actuated, then the switch can be connected in series with at least one further switch that is dependent on other actuating devices be switched.

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In heavy vehicles it may be possible that the seat control unit becomes too heavy for manual operation. Then it should be useful to pivot a special To have drive carried out. This drive can be designed so that one of the switches in an electrical Motor circuit line is seated, which applies voltage to an electric motor when the spring accumulator is actuated sets, which brings about the pivoting of the seat control unit. But it is not absolutely necessary that the Electric motor itself brings about the necessary movements. In many cases it can be useful to provide a hydraulic drive. Then the seat control unit expediently designed so that the motor drives a pump arranged in a hydraulic circuit, which allows the hydraulic medium to act on a piston located in a working cylinder that controls the seat operating unit pivoted.

In order to be able to get to the goal faster, it can be useful for larger vehicles, not a whole Drive around a circle to get to the desired locking point, but rather the seat control unit in both directions of rotation to be able to drive. In this case, it is advisable to arrange a switching valve in the pump circuit, that is able to switch the hydraulic medium from forward to reverse.

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The invention is based on dargeatell- in the drawing

th exemplary embodiments in the following description

of the item

explained in more detail, which can also be found in further details / the invention. Show it

Fig. 1 in a schematic representation of a page

view of a simple seat control unit according to the state of the art part · » wise in the cut,

Fig. 2 is a circuit diagram for the safety

Locking device of a seat control unit in which two basic conditions are met before the second Lock can be unlocked,

Fig. 3 is a circuit diagram for a safety

locking device in which, in addition to two conditions, there are additional conditions that must be met before the second lock can be unlocked,

Fig. K a safety interlocking device,

in which several conditions are met before the second locking device can be unlocked their unlocking at the same time a motor circuit to actuate the swivel « the seat control unit switches on.

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In Fig. 1, a seat control unit is shown schematically, the seat control unit 2 with the driver's seat 3 and the associated control means is arranged rotatably about the steering column 4 over a lower part of the driver's cab 1 with floor assembly. A foot pedal 5 for the speed adjustment and the clutch pedal 6 and the brake pedal 7 are arranged one behind the other in approximately the same plane on the seat operating unit 2. The operating means arranged on the seat operating unit 2 also includes a locking unit 8 which holds the seat operating unit 2 in one of the intended locking positions after it has been pivoted. A conical pin 11, which is under the load of a spring 9 and can snap into one of the corresponding recesses 12 provided in the floor pan of the lower part 1 of the driver's cab, is provided for locking. The locking unit δ can be actuated by a hand lever 13 which is articulated on a holding device lk as a two-armed lever. If the seat control unit 2 is to be unlocked, the hand lever 13 is pressed and the pin 11 is lifted out of the recess in the cab floor against the pressure of the spring 9 and the seat control unit can be pivoted to the next recess, where the pressure of the spring 9 causes the Pin 11 again engages in a recess 12, so that the seat operating unit 2 is fixed again as a result. Such a locking unit corresponding to the state of the art, however, does not provide sufficient

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Safety and carries the risk of accidents. she can be unlocked while the vehicle is moving », when the handbrake is not applied or when the engine is running will. Such an unsecured locking unit must not be tolerated for safety reasons, as it can bring many dangers. For example, if the vehicle is inclined, it is not possible to to balance the weight of the seat control unit together with the driver so that when the lock is released » unit, the seat control unit can pivot in such a position by itself in an undesired direction, which most likely to result in an accident in a moving vehicle.

The inventive design of the locking * - unit should therefore ensure that at least the The parking brake is applied and the engine is switched off before the locking unit can be released.

This results in a two-circuit interlock, the circles of which influence each other.

Appropriately, air or another, for example liquid, is used to control the locking unit. Control means are used, whereby the locking unit can be designed simply and easily adapted to the respective circumstances. In addition, there is one such training when operated in the stand iron memory

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cher effect available. Since most vehicles that have a seat control unit also have a pressure

Air trailer brake system is available, can be used as a control means the easiest way to do this is to use compressed air.

In Fig. 2 a circuit diagram of a seat control unit is shown, which is locked twice by the locking units 15 and 16 in such a way that unlocking by the locking unit 16 only takes place when the engine is stopped and the parking brakes are applied.

The speed adjustment lever 17 of the engine shown in Fig. 2 is drawn in the middle in idle, shown in dashed lines on the left in full load and on the right in dashed lines in the stop position. When the engine is switched off, the speed adjustment lever is moved from the idle position shown with a solid line to the right into the stop lock shown in dashed lines. A link 18 ensures that a linkage 19 connected to the speed adjustment lever 17 can only act between the positions "full load ¹¹ and" idle. "If, however, the speed adjustment lever 17 is brought into the" stop "position, the link 18 is turned to the right moves and the valve 21, which is always held in the "closed" position by a spring, switched over and connects the valve 22 to the compressed air reservoir 23 ·

If the parking brake is now in the passage division of the valve 22 24, with the cylinder 25 as a spring-loaded parking brake is formed by venting the cylinder 25 via the valve 26 brought into effect, so is simultaneously

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the line 27 is vented and the valve 22 is switched off by spring pressure in the "passage" position shown. As a result, the compressed air conducted through the line 28 to the spring accumulator 29 can now come into effect in this and the bolt 31 of the locking unit 16 via the lever 32 lift out of the corresponding recess. If the button 33 of the locking unit 15 is now pulled, then its locking is also released and the seat operating unit 2 can be pivoted.

In the case of other locking _{break systems} that do not work with a spring-loaded cylinder, the valve 22 must of course be designed accordingly differently.

Is now activated by pulling the button 33 while the engine is running the locking pin H is released, then the valve is 3% brought against the pressure of the spring 35 in the "passage" position, not shown. As a result, pressure is passed through the line 36 to the spring accumulator 37, which is directed to the The foot pedal for the speed adjustment 5 acts and brings this together with the speed adjustment lever 17 into the stepping position. As a result, the valve 21 is also set to "passage" placed and the locking unit 16 released, albeit the parking brake 25 is applied. Will the vehicle shut down, the locking unit 16 is when the compressed air tank is full and when the parking brake is applied solved. However, the seat operating unit cannot be adjusted without further ado as long as it is still held in place by the locking unit 15.

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Should the speed adjustment lever 17 be superimposed by a further operating lever, for example when the Foot throttle is superimposed by a hand throttle adjustment, so the gate l8 can idle between the positions and be blocked at full throttle. The gate l8 can then not be brought into the position via the linkage 19 which sets the valve 21 to "passage". In this case, even when the line 27 is vented through the valve 26, the locking of the spring accumulator of the locking unit 16 cannot be released, so that the seat can only be pivoted after the motor has switched off Is stopped manually or the speed adjustment lever jl7 of Hand has been brought to the right-hand dashed position.

In Fig. 3, a further variant of a "white-circle locking" is shown essentially as a circuit diagram. Here, the seat control unit is locked by a combination of compressed air and electrical control elements. In the same way as in the first embodiment, the parking brake 2k must also be applied here. For this purpose, as shown, the cylinders 25 are not pressurized since the valve 37 has been set to venting. As a result, no pressure is exerted on the valve 38 and the same is brought into the "through" position by the spring 39. However, only compressed air can be brought to the spring accumulator k2 of the locking unit 43 through the line kl if the valves kk and 45 are also set to "through". The valve kk is opened by actuating the locking

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unit 46 set to "passage". The valve 45 is a Solenoid valve and is only set to "continuity" if the switches 47, connected in series,

are

48 and 49 are all switched on / and therefore power to the solenoid valve 45 is directed. When the solenoid valve is energized, this is switched to "through", so that afterwards too the locking unit 43 is unlocked and thus the Seat control unit can be pivoted. The switches 47, 48 and 49 can depend on different conditions be made. For example, a switch can be dependent on whether the power flow in the transmission is interrupted is, another can be switched into the ignition line and the third can, for example, as shown in Fig. 4, serve to turn on a motor 51 that automatically the seat control unit is adjusted until, for example, the button 33 of the locking unit, which has now been released 46 is snapped into the next recess. The motor 51 can be connected to a pump 52, which leads a hydraulic medium from a container 53 via a valve 54 to a servomotor 55. Through valve 54 the servomotor can be switched to forward or reverse gear. The piston 56 of the servo motor can of course also be provided in accordance with the prior art with a limit switch, not shown, which drives the motor 51 in the desired end position by opening the switch.

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Of course, a combination of the exemplary embodiments shown in FIGS. 2 to 4 is also possible, since all control elements can be controlled mechanically via compressed air or electrically.

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Claims (1)

l6 - DaIm Io 45 Expectations Rotatable seat operating unit a utility vehicle a locking unit which has a cone which is pressed under the pressure of a spring into a corresponding recess and thereby represents a safeguard of the seat control unit against rotation, which securing is arbitrarily canceled by pressure against the spring can be, characterized in that a second locking unit (16) also «it a cone (31) which is engaged by a spring (3 *) and which can only be removed from its lock when the The parking brake (24) is applied and at least one other condition is met, for example the engine is switched off is. 2. Seat control unit according to claim 1, characterized in that the second locking unit (l6) as a function of the running of the engine and the position of the parking brake lever is controlled hydraulically or with compressed air. 3. Seat control unit according to claim 1 or 2, characterized in that one to a cylinder (29) with a pressure line (28) leading the cone (31) into its catch (12) has at least two valves (21, 22), whose adjustment on the one hand by the running of the engine and on the other hand by depends on the position of the parking brake lever. 609836/0 052 Seat control unit according to claim 3 »characterized in that a valve (21) is arranged in the pressure line (28) which closes off the line section between the compressed air tank (23) and itself and through an element (17) for regulating the injection pump ^{is switched to passage 1} in its stop position. Seat control unit according to claim 3 »thereby characterized in that a second valve (22) is arranged in the pressure line (2Ö) which the line section connecting it to a spring accumulator (29) for actuating the second locking unit (16) vented and when the parking brake is applied it switches to '' passage ". Seat control unit of a vehicle, the parking brake of which is released by pressure acting on the spring accumulator which will fix the brake in a depressurized state under the action of compression springs, thereby characterized in that the second valve (22) is actuated by a pressure line (27) which, when released Parking brake pressure from the parking brake valve (26) to the second valve (22) and thereby the line section (28) between it (22) and the spring accumulator (29) for the locking unit (l6) is vented, while the second valve (22) is in the depressurized state Pressure line (28) is switched to "passage" by a spring. 6098 3 6/0052 - 18 - Daim ίο 45o / 4 Seat control unit according to Claims 1 to 6, characterized in that a valve (34) arranged in a line connecting the pressure vessel (23) to a spring accumulator (37) is connected to the first locking unit (15), which valve (34) in the locked position of the locking unit (35) blocks the line section between itself and the pressure vessel (23) and at the same time ventilates the line section between itself and the spring accumulator (37) and connects both line sections to one another in the unlocked position, so that the spring accumulator (37) then counteracts the pressure in it The spring located allows a plunger to move out, which brings the element (5 »17) for regulating the injection pump into the stop position. Seat control unit of a vehicle, the parking brake of which is released by pressure acting on spring accumulators, which in the depressurized state under the action of compression springs lock the brake according to claims 1 to 7, characterized in that the further condition, for example interruption of the power flow in the transmission or other, acts by at least one electrical switch (47 »48,) on a solenoid valve (45) built into a pressure line (4l), which on the one hand receives the pressure coming from an accumulator (23) via a valve dependent on the position of the first locking unit (46) (44) bekowat and 609836/0052 - 19 - Daim Io 45o / 4 on the other hand, when the solenoid valve (45) is induced, this pressure is passed on to a further valve (38) which with the parking brake engaged, the pressure to a cylinder (42) with a cone (3i) of the second locking unit (43) into its notch (12) Spring (3o) conducts while it is with the parking brake free actuated by a spring, the line leading to the cylinder (42) is vented. 9 · Seat control unit according to claim 8, characterized in characterized in that the switch of the solenoid valve (45) with at least one further of others Actuator-dependent switch (47 »48) is connected in series. 10. Seat control unit according to claim 8 or 9 »characterized in that a Switch (49) in an electric motor circuit lead sits, which applies a voltage to an electric motor (51) when the spring accumulator (42) is actuated, which the Pivoting the seat control unit (2) brings about. 11. Seat control unit according to claim lo, characterized characterized in that the motor (51) operates a pump (52) arranged in a hydraulic circuit, which allows the hydraulic medium to act on a piston (54) located in a drive cylinder (55), which pivots the seat control unit (2). 05 2 2ο ■ Daim Io 45 12. Seat control unit according to claim 11, characterized in that in the Purapenkrei «- a switching valve (5 ^) is arranged that the
able to switch hydraulic medium from forward to reverse . 60Sd "3 B / 0 052 Blank page