Balancer

FIELD: transport.

SUBSTANCE: balancer (1) for lifting, retaining and lowering of cargo comprises cable drum (7) to be driven by pressurized working fluid. Winch incorporates cable drum emergency brake to brake the drum in case the preset rpm is exceeded. Note here that emergency brake device comprises one spring-loaded retainer (16) secured to cable drum (7) that can be displaced to developed locking position by centrifugal force. Note here that at locked position, cable drum revolution is locked by engagement with retainer fixed relative to cable drum (7). Retainer (16) as-actuated is kept in developed position when said retainer (16) and stop interacting therewith get disengaged.

EFFECT: higher safety.

10 cl, 3 dwg

 

The invention relates to a balancing device for lifting, holding and lowering of the cargo containing the cable drum, which can rotate under the action of fluid under pressure and has a rope to hold a load while the cable may Mosey with specified the cable drum and wound on him, and has a device for emergency braking of the cable drum, if you exceed a certain speed, the device for emergency braking comprises at least one retaining element that is attached to the cable drum, supported in position for free rotation in podpruzhinennom condition and can be moved into operating position blocking the centrifugal force, while at the position of blocking the rotation of the cable drum is locked by the locking element engages with a stopper, which is fixed relative to the cable drum.

Balancing device of this type is known, for example, from the document EP1136423A1. Such application describes a device for limiting the maximum frequency of rotation of the balancing lifting device (balancing device), in particular, for the emergency brake lifting device. The lifting device comprises a spindle reserveme.com, which is mounted rotatably in the housing, can be rotated by a piston, which can move in the longitudinal direction by means of compressed air in the casing, and carries the cable drum and also contains a spindle nut which is fixedly connected with the housing, the cable drum, which is able to move longitudinally on the spindle with a threaded end which is fixedly connected with him with the possibility of rotation in conjunction with it. A device for emergency braking of the cable drum contains a variety of clamps that can be rotated with the counteraction of the elastic holding force around the axis of rotation, which is parallel to the spindle with a threaded end, a radially inner initial position in the external braking position, with the latches in any case, oriented in the direction of rotation when the cable drum rotates and can turn their free end in the braking position under the action of centrifugal force when the rotational speed which exceeds, for the magnitude of the holding force. In extended in the radial direction of the braking position the latches engage in the respective stoppers of the external locking element which is fixedly located on the housing. All a device for emergency braking of the cable drum attached to �pindell threaded end on the trailing side of the latter with the aid of a safety slip clutch. The rotation of the rotary spindle and, thus, the cable drum is stopped by frictional connection between the internal cone and the external cone, if the clamps are moved radially outward around the axis of rotation against the holding force of the springs and interlock with the locking surfaces of the locking element, which are provided for the latches.

A device for emergency braking of the cable drum in accordance with the document EP1136423A1 configured such that when the drum is idle and there is the tension of the cable in the opposite direction, the latches are automatically returned to their original position.

Also known pneumatic balancing device with emergency brake/vehicle emergency braking, for example, from the document DE1034424B4. In the specified pneumatic balancing device a device for emergency braking of the cable drum includes at least one brake Shoe, which can rotate with the cable drum parallel to the drum axis, can move from the starting position to the braking position and the braking position forms a frictional connection with a fixed cylinder, at least one separate centrifugal element that generates a torque at engine speeds above a predetermined, PR� this specified torque, rotate the brake Shoe from the starting position to the braking position, and the moment that is generated by a frictional connection, holds the brake Shoe in braking position and pushes him into the braking position.

The brake is active only as long as the cable remains without load. In the case of cable tension as a result of suspension of the load brake is released automatically.

Above emergency braking is provided for the case when, for example, the load is separated from the wire rope. In this case, the reaction force to the equilibrium position of a missing piston for balancing device, which is loaded by the gas pressure, whereby the piston is suddenly moved along the axis of the gas pressure prevailing over it, and the cable drum is driven in rapid rotation. Without emergency braking end of the rope will be greatly accelerated, as a result, it can cause a sharp attack and cause injury or damage.

Within these limits described above, the operation of emergency braking is adequate and necessary. However, the design for these operations emergency braking does not take into account the fact that only part of the load hanging on the cable, removed from it under certain circumstances. For example, if a relatively heavy load hook remains suspended on the cable, sharp braking of the cable may result, due to the inertia force of gruzovoj� hook, to jumps cargo hook on the rope and call shaking the rope. The time, in this case, will affect the cable drum in the opposite direction of rotation, whereby the brake device is disengaged. Due to the lack of counter forces the end of the cable will again be accelerated by excess pressure, which still prevails in the balancing device.

Thus, the invention is based on the goals of improving balancing device of the type specified in the introductory part in this respect.

The goal is achieved thanks to a balancing device for lifting, holding and lowering of the cargo containing the cable drum, which is driven by the working medium under pressure and has a rope to hold a load while the cable may Mosey with specified the cable drum and wound on him, and has a device for emergency braking of the cable drum, if a certain speed is exceeded, the device for emergency braking comprises at least one retaining element that is attached to the rope drum is supported in free rotation by means of a spring and can be moved to an expanded locking position by centrifugal force, moreover, in the locking position �increment the cable drum is blocked on the basis of that the locking element engages with a stopper, which is fixed relative to the cable drum, thus balancing device is characterized in that after actuation of the locking element is held in the expanded position when the retaining element and the stopper, which interacts with him, out of gear.

The invention can be briefly outlined in the sense that the balancing device according to the invention comprises a device for emergency braking, which contains at least one retaining element, which can be deployed under the action of centrifugal force and after giving effect remains in the blocking position regardless of the direction of rotation of the moment, which is attached to cable drum. Here, the device for the emergency brake is configured in such a way that, although the locking element can be briefly disengaged from the stopper, resulting blocking action in principle not excluded.

In the context of the invention, the term "disengaged" means that the locking element does not have to be in contact with the corresponding stopper or to rest in him.

Balancing device according to the invention may contain the cable drum, which can move along the er� the axis of rotation, and mechanism with ball screws, which converts the axial movement of the piston, which is loaded by the gas pressure into rotational and axial movement of the cable drum. Here, the axial displacement of the cable drum is properly configured so that during the winding and coiling the cable comes out at one point from body covering, which surrounds the cable drum.

In one preferred embodiment of the balancing device according to the invention the locking element is held in the expanded position in a spring loaded condition. After the device for the emergency brake is powered, you must perform the unlock operation corresponding actuation manually for alerting balancing device.

The invention should be understood in principle in such a way that the device for emergency braking can be started regardless of the direction of rotation of the cable drum, if the specified limiting speed is exceeded. The locking element that can be deployed under the action of centrifugal force, for example, can also be designed so that it automatically restores the unlocked position only when the cable drum is in a predetermined position, for example, one of the terminal UE�ditch when the rope or webbing is fully unwound or fully wound.

In an alternative embodiment can be provided that the unlock operation manually is only possible in one of these limiting provisions.

According to one preferred improvement of the balancing device according to the invention provides that the locking element is configured as a locking lever, which can rotate on one side and can be moved by centrifugal force from the rotated inside the freewheel position to a radially expanded locking position.

According to the invention, a device for emergency braking, of course, may comprise a plurality of locking levers which are arranged, for example, on a common radius relative to the cable drum.

Preferably, the locking element can be rotated in each case about the axis of rotation, which runs approximately parallel to the axis of rotation of the cable drum.

In one preferred embodiment of the balancing device according to the invention provides that the retaining spring is attached to stoparea element with the assignment from the axis of rotation of the latter so that the retaining spring keeps powered locking element in the expanded position, if the locking �the entries rejected for a given position of a dead point.

Particularly preferably, if the specified lock spring also holds the locking element in the freewheel position in the inoperative position.

According to one particularly preferred improvement of the balancing device according to the invention provides that the device for emergency braking contains, in addition, at least one centrifugal lever, which is articulated pivotally on the cable of the reel and which acts on the locking element, causing it to action. Centrifugal lever may be retained, for example, a locking element in the swung in position. If a certain frequency of rotation of the cable drum is exceeded, which depends on the magnitude of the holding force of the locking spring, centrifugal lever is deflected radially outward and pushes the lock lever is in the deployed position against the force of the spring. Here the locking element is attached to the retaining spring so that if the position of the dead point is passed, the locking element would be further rotational movement in a fully turned out position only by the force of the spring. The locking element is then held in this position by its return spring.

If you are using lots of locking elements, each locking element may be provided ö�ntroversy the lever.

With this purpose, preferably, in the freewheel position, the centrifugal lever and the locking element took place approximately tangentially relative to the axis of rotation of the cable drum on the circumference of the cable drum and in case of rejection was carried out by the rotational movement in the opposite direction.

The cable drum may be arranged, for example, with the possibility of rotation and/or displacement along the axis within a stationary shroud or cylinder, and in the deployed position, the locking element may be coupled with the holes of the cage or cylinder. In an alternative embodiment, in the deployed position, the locking element can also be coupled with ribs or grooves of the cage or cylinder or also with ribs or grooves of the housing of the balancing device.

In one preferred embodiment of the balancing device according to the invention provides that the device for emergency braking of the cable drum is located on the terminal side of the cable drum, preferably, the mounting plate, which is used for this purpose.

The invention will be described with reference to the accompanying drawings, in which:

Fig.1 - view of a longitudinal section of the balancing device according to the invention,

Fig.2 is a perspective view of the holder which such�t the cable drum, and device for emergency braking the cable drum in its position relative to the holder, and

Fig.3A-3C in each case shows the views from the end face of the cable drum with a device for emergency braking, while the figure in each case shows different States of the locking element and the centrifugal lever.

In the first place, reference will be made to Fig.1. On the figure shown in the longitudinal section of the balancing device 1 as a pneumatic balancing device. Balancing device 1 comprises a cylindrical housing 2 and the connecting cap 3, which is mounted on the housing 2 at its ends. Axis 4, which is mounted in a fixed position from the point of view of rotation and partially configured as a spindle 5 ball bearing, passes through the longitudinal Central axis of the balancing device 1. Spindle nut 6 which is fixedly connected with a cable drum 7 for joint rotation with it, is mounted rotatably on the spindle 5 mounted on ball bearings. The steel cable can be wound on the cable drum and hit the road with him. To simplify the steel cable not shown in the drawing.

The housing 2 comprises a chamber 8, which is filled with compressed air and in which is located the piston 9 so that it can move along the axis 4. The piston 9 is sealed �through the annular sealing edge 10a relative to the cylindrical wall of the chamber 8. The piston 9 is sealed on the inner side relative to the axis 4 by means of a second sealing edge 10b. On its side facing the cable drum, the piston 9 acts on the cable drum 7 through a ball thrust bearing 11. Ball thrust bearing 11 allows the relative rotation between the piston 9 and a cable drum 7. Due to the interaction of the fixed spindle 5 on the bearings or the part of the axis 4, which is configured as a spindle 5 on the bearings and the spindle nut 6 which is fixedly connected with a cable drum 7 for joint rotation with it, the cable drum 7 rotates around the axis 4 as a result of axial displacement of the piston 9 and simultaneously moves along the axis to exactly match the length with which the rope is wound on the cable drum 7, winded or wound.

Here move groove ball bearings in the spindle 5 on the bearings shall be of such dimensions that the rope is wound on the cable drum, always comes out at one point from the outlet of the cable, which is made for this purpose.

To this end the side of the cable drum 7, which is facing away from the piston 9 facing position mounting plate 12 which is fixedly connected with a cable drum 7 for sovmestnog� rotation with him. The cable drum 7 is centered within a cylindrical holder 13, which is installed or fixed flange connection with prevention of rotation within the housing.

Perspective view of the shroud 13 can be seen in Fig.2. This clip 13 has an approximately cylindrical configuration and on its side facing the piston 9, is attached a flange to the casing 2 by means of mounting flange 14. The circular surface of the shroud 13 is provided with a lot of openings 15 which, as will be described hereinafter, cooperate with the retaining element 16.

Retaining element, which is denoted by the reference position 16, and the centrifugal lever 17 mounted with the possibility of hinge rotation in the mounting plate denoted by the reference position 12, which is connected, as stated, still with the end of the cable drum 7 for joint rotation with it and having an approximately annular configuration and is inserted into the circumference of the shroud 13. Axes 18, 19 of rotation of the locking element 16 and the centrifugal lever 17 are approximately parallel to the axis 4, which simultaneously forms the axis of rotation of the cable drum 7.

The locking element 16 and the centrifugal lever 17 are spaced around the circumference of the installation plate 12 so that the locking element 16 and the centrifugal lever 17 are �roughly tangent to the circle. Rotational motion, which may be a locking element 16 and the centrifugal lever 17 in each case, takes place in the opposite direction, the stopper member 16 and the centrifugal lever 17 rests approximately in the inner circumference of the annular mounting plate 12 in the freewheel position of the specified locking element 16 and the centrifugal lever 17. This situation is shown in particular in Fig.3a. In this position the locking element 16 lies on the centrifugal lever 17 when viewed from the inside out. In this position the locking element 16 is held in place by a locking spring 20. The locking spring 20 is similar is tangent to the inner circumference of the installation plate 12 or on a tangent to the circle which runs concentrically with the axis 4. The locking spring 20 is attached to stoparea the eccentric element 16 with the assignment of the axis 19 of rotation such that in the initial position, which is shown in Fig.3a, the locking element 16 is held in place by a locking spring 20 in the rotated inside the position that is subjected to a torque around the axis 19 of rotation against the direction of clockwise (direction of rotation in the views in the figures) and is experiencing the opposite point, if the locking element 16 rotates radially outward through the dead point position. Lay� dead - this is the situation in which both points of fastening of the lock spring 20 and the axis 19 of rotation are aligned with each other. In the dead point position automatic righting movement of the locking element 16 in the position of the freewheel no longer possible.

If the cable drum 7 performs, for example, rotation in the counterclockwise direction, and the rotation speed exceeds a certain rotational speed which is set to force the lock spring 2, the centrifugal lever 17 is deflected against the direction of clockwise. Here the free end 21 of the centrifugal lever 17 pushes the locking element 16 in a radially outward direction beyond the dead point position of the locking spring 20, whereby the locking element 16 engages one of the apertures 15 of the holder 13. Here the locking spring 20 holds the retaining element 16 in a radially extended position blocking. In the described exemplary embodiment the device for emergency braking congured as a means of blocking inadvertent twisting of the cable and, in the alternative, can also be configured as a means of fall protection.

As can be seen in Fig.2, the locking element 16 inhibits the cable drum 7 against the direction of clockwise (with respect to the form n� Fig.2). In the case of a correspondingly mirrored the location of the locking lever 16 and the centrifugal lever 17 may be possible blocking of the rotation in the clockwise direction.

Razblokiruite action is possible only if the corresponding manual recovery of the original position of the locking element 16.

The balancing chamber 8 of the device 1 is filled with compressed air through the connector for fluid under pressure (not shown). The pressure within the chamber 8 is approximately balanced by the power that is attached to the piston 9 through a ball thrust bearing 11 a cable drum 7, if a load is suspended. The movement of the cable drum 7 takes place through the operation of the load control pressure chamber 8, which causes the axial movement of the piston 9 and the rotation of the cable drum 7 around its axis. During operation the cable (not shown) is wound and unwound. In case of sudden loss of load is balance of power is broken so that the cable drum 7 exceeds a certain limited speed. As a result, are caused by the deviation of the centrifugal lever 17 about the axis 18 of rotation and thus also the deflection of the locking element 16 around the axis 19 of rotation. The rotational speed and/or centrifugal force, whereby the deviation of this type �may depends on the characteristics of the lock spring 20 and the centrifugal mass of the lever 17.

The list of reference positions

1 - Balancing device

2 - Housing

3 - connective cover

4 - Axis

5 - Spindle ball bearing

6 - Spindle nut

7 - the Cable drum

8 - Camera

9 - Piston

10A, b - Sealing edge

11 - Thrust ball bearing

12 - Mounting plate

13 - Yoke

14 - Mounting flange

15 - Slot

16 - Retaining element

17 - Centrifugal lever

18 - the Axis of rotation

19 - the Axis of rotation

20 - retaining spring

21 - the Free end of the centrifugal lever

1. Balancing device (1) for lifting, holding and lowering of the cargo containing the cable drum (7), which is driven by the working medium under pressure and has a rope to hold a load while the cable may Mosey with specified the cable drum (7) and wound on him, and has a device for emergency braking of the cable drum (7), if a certain speed is exceeded, the device for emergency braking comprises at least one retaining element (16) attached to cable drum (7), supported in free rotation by means of a spring and can be moved to an expanded locking �the regulations by centrifugal force, moreover, in the locking position, the rotation of the cable drum (7) is blocked on the basis of the fact that the locking element (16) engages with a stopper, which is fixed relative to the cable drum (7), characterized in that after the operation the locking element (16) is held in the deployed position when the locking element (16) and the stopper, which interacts with him, out of gear.

2. Balancing device according to claim 1, characterized in that the retaining element (16) is held in the expanded position in a spring loaded condition.

3. Balancing device according to claim 1 or 2, characterized in that the retaining element (16) is configured as a rotatable locking lever that can be moved to actuate the centrifugal force from the rotated inside the freewheel position to an expanded in the radial direction of the locking position.

4. Balancing device according to claim 1 or 2, characterized in that the locking spring (20) is attached to stoparea element (16) with the assignment from the axis (19) of rotation of the latter so that the locking spring (20) holds the retaining element (16) in the unfolded position, if the locking element (16) is deflected beyond the dead point position.

5. Balancing device according to claim 4, characterized in that stope�Naya spring (20) holds the retaining element (16) in the freewheel position in the inoperative position.

6. Balancing device according to any one of claims.1, 2 and 5, characterized in that the device for emergency braking contains, in addition, at least one centrifugal lever (17) articulated on the cable drum (7) and which acts on the locking element (16) for actuating.

7. Balancing device according to claim 6, characterized in that the centrifugal lever (17) is held locking element (16) is turned inwards in the initial position.

8. Balancing device according to claim 6, characterized in that the freewheel position of the centrifugal lever (17) and retaining element (16) are approximately tangentially relative to the axis of the cable drum (7) on the circumference of the cable drum (7) and rejecting carry out rotational motion in the opposite direction.

9. Balancing device according to any one of claims.1, 2, 5, 7 and 8, characterized in that the cable drum (7) is arranged rotatably and/or move along an axis within a stationary holder (13) or cylinder, and in that in the unfolded position the locking element (16) is engaged with the locking holes (15), the ribs or grooves of the shroud (13) or cylinder or a fixed housing.

10. Balancing device according to any one of claims. 1, 2, 5, 7 and 8, characterized in that the device for emergency braking t�special drum (7) is located on the terminal side of the cable drum (7).



 

Same patents:

Lever-segment winch // 2269484

FIELD: mechanical engineering; load-lifting facilities; hand lever winches.

SUBSTANCE: according to invention, grips are made with tubular bodies of rectangular section. Four through holes are made in body of each grip. Upper holes are designed for tow segment cams with double-arm guides fitted-in from one side of grip body, and lower ones are designed for segment cams provided with single-arm guides fitted from other side of grip body. Double-arm lever of turn drive is two-section one, both sections of lever being connected by neck to pass wire rope from below. Each section is provided with slot with two axles fitted in cheeks of said slot. Said axles of one of sections are hinge-connected with power tie-rods hinge-connected with paired links of lower arms of double-arm guides of both grips from one of their sides. Axles of other section are hinge-connected by other power tie-rods with paired links of single-arm guides of both grips from opposite side.

EFFECT: improved reliability and wear resistance.

5 cl, 6 dwg

Hoisting device // 2261215

FIELD: transport engineering; agricultural.

SUBSTANCE: in agricultural proposed device can be used as obstetrical facility for pulling out calf at calving. Proposed device contains two tubular bow-shaped articulated semiframes. Rack rests against middle of one of semiframes by end face through saddle joint. Rack is made in form of nonclosed box-shaped beam with roller-bushed chain placed between its side walls along axis of beam. One end of chain is secured through axle on said walls, and the other is connected with tension adjuster. Adjustable insert is secured on vertical wall of drive mechanism housing from inside over beam. Insert slides along upper plane of beam flange. Sprocket is secured on shaft passing through sliding bushings fitted in housing walls. Said sprocket meshes with roller-bushed chain. Two ratchets are installed on square journals of shaft symmetrically to teeth of sprocket. Ratchets engage with spring-loaded locks fitted in slots of holder and holder-ratchet mating with said ratchets. With sprocket rotating, it moves along chain together with housing of drive mechanism.

EFFECT: improved efficiency and reliability.

7 cl, 8 dwg

Winch (options) // 2098342
The invention relates to a traction mechanisms, mounting, which will be used for repair, cargo handling works in various branches of national economy

Grip for winch // 2094361
The invention relates to a traction mechanisms, mounting, which can be used for repair, cargo handling works in various branches of national economy

Lifting device // 2085474
The invention relates to lifting devices and can be used for both lifting and stuck on a bad road vehicles

Lifting device // 2085473
The invention relates to devices for moving loads

Puller // 2084396
The invention relates to hoisting and transport machinery, namely: lever hoists, and can be used to move and install loads in horizontal, vertical and inclined planes in exterior and interior construction work

Hoisting device // 2261215

FIELD: transport engineering; agricultural.

SUBSTANCE: in agricultural proposed device can be used as obstetrical facility for pulling out calf at calving. Proposed device contains two tubular bow-shaped articulated semiframes. Rack rests against middle of one of semiframes by end face through saddle joint. Rack is made in form of nonclosed box-shaped beam with roller-bushed chain placed between its side walls along axis of beam. One end of chain is secured through axle on said walls, and the other is connected with tension adjuster. Adjustable insert is secured on vertical wall of drive mechanism housing from inside over beam. Insert slides along upper plane of beam flange. Sprocket is secured on shaft passing through sliding bushings fitted in housing walls. Said sprocket meshes with roller-bushed chain. Two ratchets are installed on square journals of shaft symmetrically to teeth of sprocket. Ratchets engage with spring-loaded locks fitted in slots of holder and holder-ratchet mating with said ratchets. With sprocket rotating, it moves along chain together with housing of drive mechanism.

EFFECT: improved efficiency and reliability.

7 cl, 8 dwg

Lever-segment winch // 2269484

FIELD: mechanical engineering; load-lifting facilities; hand lever winches.

SUBSTANCE: according to invention, grips are made with tubular bodies of rectangular section. Four through holes are made in body of each grip. Upper holes are designed for tow segment cams with double-arm guides fitted-in from one side of grip body, and lower ones are designed for segment cams provided with single-arm guides fitted from other side of grip body. Double-arm lever of turn drive is two-section one, both sections of lever being connected by neck to pass wire rope from below. Each section is provided with slot with two axles fitted in cheeks of said slot. Said axles of one of sections are hinge-connected with power tie-rods hinge-connected with paired links of lower arms of double-arm guides of both grips from one of their sides. Axles of other section are hinge-connected by other power tie-rods with paired links of single-arm guides of both grips from opposite side.

EFFECT: improved reliability and wear resistance.

5 cl, 6 dwg

Balancer // 2550796

FIELD: transport.

SUBSTANCE: balancer (1) for lifting, retaining and lowering of cargo comprises cable drum (7) to be driven by pressurized working fluid. Winch incorporates cable drum emergency brake to brake the drum in case the preset rpm is exceeded. Note here that emergency brake device comprises one spring-loaded retainer (16) secured to cable drum (7) that can be displaced to developed locking position by centrifugal force. Note here that at locked position, cable drum revolution is locked by engagement with retainer fixed relative to cable drum (7). Retainer (16) as-actuated is kept in developed position when said retainer (16) and stop interacting therewith get disengaged.

EFFECT: higher safety.

10 cl, 3 dwg

Balancer // 2550796

FIELD: transport.

SUBSTANCE: balancer (1) for lifting, retaining and lowering of cargo comprises cable drum (7) to be driven by pressurized working fluid. Winch incorporates cable drum emergency brake to brake the drum in case the preset rpm is exceeded. Note here that emergency brake device comprises one spring-loaded retainer (16) secured to cable drum (7) that can be displaced to developed locking position by centrifugal force. Note here that at locked position, cable drum revolution is locked by engagement with retainer fixed relative to cable drum (7). Retainer (16) as-actuated is kept in developed position when said retainer (16) and stop interacting therewith get disengaged.

EFFECT: higher safety.

10 cl, 3 dwg

Balancer // 2550796

FIELD: transport.

SUBSTANCE: balancer (1) for lifting, retaining and lowering of cargo comprises cable drum (7) to be driven by pressurized working fluid. Winch incorporates cable drum emergency brake to brake the drum in case the preset rpm is exceeded. Note here that emergency brake device comprises one spring-loaded retainer (16) secured to cable drum (7) that can be displaced to developed locking position by centrifugal force. Note here that at locked position, cable drum revolution is locked by engagement with retainer fixed relative to cable drum (7). Retainer (16) as-actuated is kept in developed position when said retainer (16) and stop interacting therewith get disengaged.

EFFECT: higher safety.

10 cl, 3 dwg

Up!