FR2644101A1 - CLOSURE DEVICE FOR A BALL PRESS PORT - Google Patents

Abstract

A baler door closure device has an eccentrically mounted locking lever 22 which engages a shaft 17. In the locked position the device can be secured by means of a safety lever 25 which prevents movement. rotation of the shaft 17. In order to protect the user in the event of a power failure or incorrect operation, it is provided according to the invention that the locking lever 22 can rotate freely by 180degre (s) with respect to shaft 17 before driving it in either direction.

Description

CLOSURE DEVICE FOR DOOR

BALL PRESS

  The invention relates to a closure device for

baler door.

  There is already known a closure device for a baler (DE-OS-2 942 218) in which the door of the press is grasped, on the side opposite its hinge, by two locking arms which apply this side of the door against a door frame. The opposite ends of the two locking arms are pivotally connected to the ends of the eccentric levers. These are mounted on an axis fixed on the frame of the baler. A lever attacks the eccentric. In the locking position, the locking arms cooperate with the eccentrics in the manner of a toggle joint, so that the closing device locks itself. For the opening, we rotate in

back the lock lever.

  It is also already known (DE-OS-3 412 307) to ensure the safety of the locking position of the locking lever by means of a safety lever. With the safety lever in place, it is no longer possible to rotate the locking lever backwards. If the safety lever is released, it acts on a switch that causes the press piston to retract. At this time, the pressure that occurs on the door, because of the return effect of the spring of the material contained in the baler, is eliminated. However, if there is a power failure, the change of position of the safety lever causes the release of the locking lever and, therefore, the

2 6 4 4 1 0 1

  possibility to open the baler, but not to bring the press piston back. If the user then again pivots the locking lever, the door of the baler can then exert on the lever a significant torque, which can cause

injuries.

  This case can also occur if one manipulates the two levers voluntarily but by doing a wrong maneuver. The object of the invention is to create a closure device for a baler, in which the security is further improved. In particular, there must be no risk of injuring the user when opening the press door under the effect of compression of the material

put in ball.

  In view of the solution of this problem, the invention provides that the locking lever is arranged so that it can pivot freely from a limited angle by

  relative to the eccentric lever.

  If then the door of the press opens a little, because

  that it is released by moving the lock lever

  if the other security systems fail, the very sudden movement of the press door, which may occur under the pressure of the compressed materials contained in the baler, is not transmitted. not immediately on the lever. This sudden movement is only transmitted after a certain journey has been

  traveled, during which the force is already decreasing.

  Such a device is particularly rational when the locking lever is connected to an eccentric lever which is pivotable about an axis fixed on the frame of the baler. In addition, this axis is itself connected to the end of the locking arm via a shaft parallel to the axis. Such a

  similar to a tilting lever, is very

  to obtain significant forces. It also implies that in case of an uncontrolled opening movement of

  the door of the press, the eccentric shaft rotates

relatively quickly.

  The connection between the locking lever and the eccentric lever can be effected either directly or by virtue of the fact that the eccentric lever is

connected to the tree.

  It is also possible to use the technical means proposed in the invention in the case where the locking device can be locked in the locked state by means of a safety lever, particularly when it bears against the shaft. This safety lever is arranged in such a way that, when it is released, it actuates a switch which pushes back slightly the drive of the press. However, it can not fulfill its function when, for example,

  produces a power failure. The means proposed by the invention

  tion is particularly appropriate in this case as it avoids

  the user to risk being injured even when

  it trusts and relies on the reaction of this first

security device.

  In a known press door (DE-OS-3 412 307), the locking lever and the safety lever intersect

  one above the other in the locked state; He is also

  It is possible to seize each of the two levers with one hand and release the security. The invention proposes that the locking lever is not crossed with the lever of

  in the extreme position where it is located at the

  of the angular field, in order to open the closing device. It avoids holding it by hand which, in the case of a reversal of the lever, can cause a

injury to the forearm.

  The angle of which the locking lever is freely pivotable can, according to the invention, be at least 90 ', preferably it is about 180. In this case, n is such that the force which occurs when the door opens violently, has already become almost zero at the end of the race, because the lever forming eccentric is

  moves 180 'between its two extreme positions.

264410-1

  According to the invention, it can be provided, as a

  In this embodiment, the locking lever is, when in its extreme position ready to act for closing, disposed approximately in the extension of the eccentric lever. In this way, the lever arm

becomes particularly long.

  The invention proposes, as a development, that the locking lever is fixed to the shaft connected to the eccentric lever, with rotational locking. It would also be possible to fix the locking lever on the eccentric lever itself and mount the shaft, locked in rotation on the locking arm, and free in

  rotation, on the eccentric lever.

  As a development, it can be foreseen that the

  locking lever is attached to the end of the shaft.

  We obtain a particularly simple connection and

  effective use, between the shaft and the lock lever

  when it has a sleeve threaded on the arm-

  bre, having a slot disposed on a portion of the

  circumference into which an element penetrates, in particular

  tie a pin, fixed to the shaft, so that no rotation is possible. Due to the length of the slot, measured in the circumferential direction, it is possible to determine the angle at which the locking lever can

  freely be turned without encountering a stop.

  The invention creates an additional security element

  for baler doors. It acts by being

  by voluntary action and in a mechanical way without

  has a risk of failure of this security system.

  Other features, details and benefits of

  the invention appear in the description of a form

  preferred embodiment of the invention and in accordance therewith

  dance with the drawing, o: - Figure 1 shows the schematic side view

  a baler, in the green state

  rust; - Figure 2 shows the position of the locking lever shortly before opening; - Figure 3 shows the position of the locking lever during closing shortly before the final locking position; - Figure 4 shows, enlarged, the connection between the locking lever and the shaft; - Figure 5 shows schematically the position of the locking lever and the shaft in the locked state; - Figure 6 is a representation corresponding to Figure 5 shortly before the start of the opening movement; FIG. 7 is a representation corresponding to the

  Figure 6, the press door being open.

  Figure 1 shows the schematic side view of the

  closing device of a baler, the document of which

  DE-OS-3 412 307 has made known the principle and to which it is, consequently, refers for all of its contents. The press door 11 that is shown on the left in FIG. 1 is mounted, for example, pivotally in the

  area of its lower end. In the area of its

  upper mite, it has a lateral projection 12 in the form of tenon which can also be constituted by a rod which passes through it. On the opposite side, the press door 11 has an identical structure. A locking arm 13, which pulls

  the press door 11 against a door frame, not shown

  felt, clings to the projection 12 and this perpendicular to the surface of the door 11 press, and to the right in Figure 1. The locking arm 13 is provided near its free end 14, left on the Figure 1, a notch 15 made recessed, disposed on its lower side, which constitutes a hook which takes the projection 12 in the form of tenon. At its opposite end 16, the locking arm 13 is connected by means of a shaft 17, rotatably mounted on it, to an eccentric lever 18. The lever 18 is, in turn, pivotally articulated at a location between the two ends 14, 16 of the locking arm 13, on an axis 19 which is arranged in a projection 20 of the frame 21

26 4 4 1 0 1

  press, which goes up. The axis 18 is parallel to the shaft 17. A pivoting of the lever 18, forming an eccentric with a radius given by the distance between the axis 19 and the shaft 17,

  thereby causing a pivoting movement of the end

  corresponding tee 16 of the locking arm 13, and this on

a lower angle of rotation.

  The locking position shown in Figure 1 is reached when the projection 12, the axis 19 and the shaft 17

  are aligned. There is no turning torque then

  around the axis 19, so that the locking arm

can not open.

  On the shaft 17 connected to the lever 18 forming eccentric, is fixed a locking lever 22 having a pommel

23.

  On the side wall of the frame 21 of press, which can be seen in Figure 1, is articulated on a point of rotation 24, located below and to the right of the shaft 17, a safety lever 25. The safety lever 25 is bent, Z-shaped, with a recess. Its middle part 26 which

  is arranged transversely rests directly on the

  17. As a result, a pivoting of the eccentric lever 18, which would cause the shaft 17 to rotate upwards, is prevented. At its upper end, the safety lever also has a

grasping knob 27.

  On the side wall of the press frame 21 is mounted, in the region of the lever 25, an electric switch 28 which

  the pusher 29 can be actuated by the safety lever

25.

  The locking lever 22 is fixed on the shaft 17 so that it can be pivoted by a certain angle with respect to this shaft 17 before it leads to

  17. Figure 1 shows the lock lever

  ge 22 in the position in which it is placed at one end of this angle, that is to say in the position where it

  is when moved in the direction of closing

  closure device 13, namely, in the FIG.

  re 1, in a clockwise direction.

  To open the closing device, the safety lever 25 is first turned in the direction of the needles

  of a watch, this one activates on this occasion the pus-

  29 of the switch 28. This is shown in FIG. 2. Then, the lock lever 22 can be rotated in the opposite direction to that of the hands of a switch.

  shows; no movement of the tree 17 or the eccentric

  that 18 are still happening. This is shown in FIG. 2. When the locking lever 22 reaches the end of its free pivoting, in the second position

  extreme, which could be, for example, the position

  2, the continuation of the pivoting in the direction of the opening, that is to say in the clockwise direction in the figures, then causes the eccentric lever 18 to pivot, and this fact, an opening

of the closure device.

  It should be noted that in the position which is

  2, there is already no crossing of the levers, seen from the side, so that for this reason, there is already a reduced risk that the locking lever 22

strike a forearm.

  If you close the locking device, you can

  then rotate the lever from the

  turn to the right, that is to say to the closed position, until it reaches the position shown in Figure 3, relative to the eccentric lever 18. Continued pivoting to the right causes traction on the locking arm 13 and, as a result, the press door 11 is brought further against the frame and is closed. As soon as the lever 18 forming

  eccentric is in alignment with the lock arm

  13, that is to say that the locking position pro-

  the safety lever 25 falls by itself, because of the way it is arranged, above the shaft 17 and, as such, it constitutes a

  security for the locking position.

  FIG. 4 represents one of the possible ways of creating the connection between the shaft 17 and the locking lever 22, allowing a free pivoting of a certain angle. The locking lever 22 is radially fixed to a cylindrical sleeve 30, for example by welding. The sleeve is closed at its free end. The sleeve has a slot 31 which is disposed at its periphery on a certain

  angle of, for example, 180 and from the outer

  laugh, crosses to the inner bore. The sleeve is threaded onto the free end of the shaft 17, preferably having little clearance. The end of the shaft 17 contains a radial bore in which a post 32 is placed which,

  therefore, is placed in the slot 31. The tenon has a diameter

  which is the width of the slot 31. The locking lever 22 can, in each case, be pivoted until the pin 32 comes to bear against one of the two

ends of the slot 31.

  The upward pivoting of the shaft 17 is prevented by the middle part 26 of the safety lever 25, which

is arranged transversely.

  Figure 5 shows a section of a sleeve 30 of a safety lever 22. The slot 31 extends over a portion of the periphery, which represents a little read half of the

  circumference. Figure 5 shows the position of

  rusting of Figure 1, that is to say that we made

  pivoting the lock lever 22 to the lock position

  lage far enough for one of the ends of the slot

be leaning against the post 32.

  To open, after rotating the safety lever 25, the locking lever 22 is pivoted in the direction of opening, that is to say, in the figures, in the opposite direction to that of the needles of a shows, until the opposite end of the slot 31 bears against the pin 32. During this pivoting movement, the eccentric remains unchanged. When the safety device released by the switch 28, which is a little backward the piston of the press, so that the pressure

  removed inside the press, works properly

  so well that the door 11, as soon as it is relieved,

  can be opened by pushing the lever 22 downwards.

  If, on the other hand, there is a power failure or other event, which results in the content of the

  press and, therefore, its door 17 are still under

  The continuation of the downward push on the lever 22, far from the position of FIG. 6, results in the appearance of a large torque which makes the eccentric lever rotate very rapidly around its fixed axis. However, this rotational movement merely causes the lever 22 to move in translation in its longitudinal direction (see FIG. 7) and not to rotate the lever, since the post 32 can not transmit a rotational torque. at the lever 22. If a slot 31 has been chosen such that the angle at which the locking lever 22 can turn freely is 180, a force transfer occurs on the lever 22 only in the position shown in FIG. figure 7, in which the eccentric 18 has rotated 180 around its

  axis 33. But this represents the maximum pivoting position

  mum locking arm 13, as continuing to rotate the eccentric 18, the locking arm 13 would be pulled again. That's why the force that develops when

  the opening of the door ceases in this position.

  In the device shown in FIG. 4, the locking lever 22 can be pivotally

  the position of Figure 6, before the safety lever

25 is released.

  It is also conceivable to give the safety lever 25, by means of an additional bend, a shape such that it must first be cleared before it can be

  open the lock lever 22.

  Of course, the present invention is not limited to the embodiments described and shown and is capable of numerous variants accessible to the man of

  art without departing from the spirit of the invention.

Claims (10)

  1.- Closure device for the door (11) of a baler, on which at least one locking arm (13) with a hook or similar member is connected, which is connected in the its opposite end (16) to a pivotable locking lever (22), which can be pivoted into a locking position which locks the closure device, characterized in that the locking lever (22) is arranged so that it can be rotated freely from a limited angle.   2. Closure device according to claim 1,   characterized in that the locking lever (22) can -   connected to an eccentric lever (18) which can be pivoted about an axis (19) fixedly arranged on the frame (21) of the baler and which is connected through a shaft (17) parallel to the axis (19) at the end (16) of the locking arm (13), the locking lever (22) being rotatably shaped   relative to the eccentric lever (18).   3. Closure device according to claim 1 or 2, characterized in that the closure device can be locked in the locked state by means of a lever (25) of   safety which, in particular, bears against the shaft (17).   4.- Closing device according to one of the claims   characterized in that the actuating lever (22) is in the extreme position, in which   this opens the locking arm (13), the two   (22, 25) do not cross one above the other.   5.- closure device according to one of the claims-   tions, characterized in that the angle is from less 90.   6.- Closing device according to one of the claims   tions, characterized in that the angle is approximately 180.   7.- Closing device according to one of the claims   tions, characterized in that the lever (22) of i1   lock is arranged approximately in the extension   eccentric lever (18) when in the   extreme position for closing.   8.- Closing device according to one of the claims   2 to 7, characterized in that the locking lever (22) is attached to the eccentric lever (18). being blocked in rotation.   9.- Closing device according to one of the claims   2 to 8, characterized in that the lever (22) for   rust is attached to the end of the shaft (17).   10.- Closing device according to one of the claims   2 to 9, characterized in that the lever (22) for   rusting has a sleeve (30) threaded on the shaft (17), sleeve having a slot (31) which is arranged on a   part of the circumference in which an element has taken   a tenon (32), fixed to the shaft (17) and which is blocked in rotation.