Abstract:
The invention relates to a device for forming, such as a press tool comprising: a body having a receiving structure end for receiving into a receiving structure of a folding press, which end is connected via a central portion to a tool end, at least one safety member which can protrude beyond a surface plane of the receiving structure end, and an actuating member which is movable in a first direction and which is coupled to a safety member, comprising immobilizing means for making the actuating member inoperative.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a device for forming, such as a press tool comprising:
         a body having a receiving structure end for receiving into a receiving structure of a folding press, which end is connected via a central portion to a tool end,   at least one safety member which can protrude beyond a surface plane of the receiving structure end,       

     and an actuating member which is movable in a first direction and which is coupled to a safety member. 
     2. Description of Related Art 
     Such a device is known from EP-A-0 494 714. This document describes a press tool in which the safety member is operated by an actuating member, enabling direct insertion into and removal from a receiving structure of a folding press, substantially perpendicular to the length of the receiving structure. 
     The safety member extends in the embodiment of this document out of a side surface of the receiving structure. U.S. Pat. No. 6,467,327 discloses an embodiment with a safety member extending from a top surface of the receiving structure. 
     Sometimes the actuating member is operated by accident as a result of which the press tool may at least partially fall out of the receiving structure. It is an object of the invention to prevent accidental actuation of the safety member. 
     EP-A-1 493 506 describes a press tool having a lockable safety member. This document provides a solution for the problem that a spring biased safety member can be disengaged from the tool holder while manipulating the tool within the receiving structure. By sliding the tool in the receiving structure it is possible that the safety member is pressed inwardly, which could cause the tool to fall out of the receiving structure. 
     This document, EP-A-1 493 506 provides a lock for the safety member, such that the safety member, in locked situation, is like a fixed safety member. In order to remove a tool with locked safety member, the safety member first has to be unlocked, after which the safety member can be disengaged. This is similar to a locked door, in which the lock of the door first has to be unlocked by using a key and afterwards the door can be opened by operating the door handle. So the lockable safety member of EP-A-1 493 506 needs additional operations in order to remove the tool from the receiving structure. 
     Another disadvantage of this embodiment is that when the safety member is locked, the tool cannot be inserted into the receiving structure substantially perpendicular to the length of the receiving structure. It could even damage the receiving structure of the safety member when insertion of a tool with locked safety member is nevertheless tried. 
     Still another disadvantage of EP-A-1 493 506 is that in unlocked state, the tool can be removed in a non controlled manner. The spring biased safety member determines the force necessary to pull out the tool from the receiving structure. If the spring is weak, the tool can even fall out spontaneously. 
     SUMMARY OF THE INVENTION 
     It is expressly not the object of the invention to provide a lockable safety member, but to prevent accidental operation of the actuating member. 
     This object is achieved by the invention which is characterized by immobilizing means for making the actuating member inoperative. By making the actuating member inoperative it is no longer possible to operate the safety member. 
     Immobilizing of the actuating member does not necessarily result in an immobilized safety member not able to perform the intended function. So with immobilized actuating member, a tool can still be inserted in an insertion direction substantially perpendicular to the length of the receiving structure into a receiving structure, while the safety member prevents the tool from falling out of the receiving structure. The tool can however not be taken out in the opposite insertion direction substantially perpendicular to the length of the receiving structure as long as the actuating member is immobilized. 
     In a preferred embodiment of the device according to the invention the immobilizing means comprise a cam for blocking movement of the actuating member in the first direction, and wherein at least a part of the actuating member is movable in a second direction different from the first direction, such that the actuating member can be moved beyond the blocking cam. Preferably, the second direction is substantially perpendicular to the first direction and in particular the second direction is substantially perpendicular to the length of the receiving structure. 
     The cam prevents the operation of the actuating member by accident. The operator needs to first shift the actuating member in the second direction after which the actuating member can be pressed in the first direction such that the safety member is operated. 
     Preferably the device comprises spring means, such as a leaf spring or coil spring, for urging the actuating member in the second direction towards the blocking position. The leaf spring ensures that the actuating member is always urged back to its blocked position, such that also after accidently touching the actuating member several times, the actuating member is still in the blocked position and not slowly moved to a position in which the actuating member still can be accidently operated. 
     The cam is preferably arranged at the body, but can also be provided at the actuating member. 
     In another embodiment of the device according to the invention, the actuating member has an operating portion, which is movable in the second direction. In this embodiment the operating portion is blocked and has to be moved in the second direction, after which the operating portion can be pressed in order to actuate the safety member. 
     Preferably the actuating member is rigidly connected to the safety member. By rigidly connecting the safety member to the actuating member less movable parts are present in the press tool, which decreases the chance on faulty operation. 
     In another preferred embodiment of the device according to the invention the actuating member comprises a guide member extending in the actuating direction and wherein the immobilizing means comprise blocking means for blocking the movement of the guide member. Instead of blocking the actuating member it is also possible to block the movement of the guide member, which guides the actuating member within the tool body. 
     In another preferred embodiment the blocking means comprise a slide member arranged at the body, which slide member is slidable to a position blocking the movement of the guide member. This slide member can be spring biased towards the blocking position. An operator has to slide the slide member before the actuating member can be operated. 
     In still another embodiment of the press tool according to the invention the blocking means comprise a spreading member arranged relative to the guide member such that the spreading member is blocking the movement of the guide member in non-spreaded state, and relative to a spread actuating member for bringing the spreading member in a spreaded state unblocking the guide member. Obviously, the reversed situation is also feasible. In which the spreading member is blocking the movement in a spreaded state, and is deblocking in the non-spreaded state. 
     Preferably the spreading member is coaxially arranged with the guide member. Furthermore the spreading and the despreading may be controlled by the actuation system. 
     This spreading member can comprise a ring and fingers arranged to the ring extending towards the axis of the ring, and wherein the spreading actuating member is a pin having a diameter smaller than the inner diameter of the ring. By pressing the pin into the spreading member, the fingers of the spreading member are pushed outwardly providing space for the guide member such that the actuating member can be operated. 
     In yet another embodiment of the device according to the invention, the safety member is slidably arranged in the body, wherein the actuating member is slidably arranged in the body and further comprising a lever coupled between the actuating member and the safety member and wherein the immobilizing means comprise a lever actuating member for moving the lever from a disengaged position to an engaged position. When the lever is in disengaged position, the actuating member can be operated, but this has no influence on the safety member. As a result the actuating member is immobilized in performing the intended function. Now by operating the lever actuating member, the lever is placed into an engaged position such that by operating the actuating member the safety member is operated. 
     Preferably the lever actuating member is substantially coaxially arranged to the actuating member. The actuating member could comprise a guide member extending in the actuating direction and the lever actuating member is slidably guided by the guide member. This provides for a cost-effective embodiment of the device according to the invention. 
     Preferably the lever is a leaf spring. This enables to change the shape of the lever when being operated by the lever actuating member. This provides the possibility for a better engagement of the lever onto the safety member and the actuating member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features of the invention will be elucidated in conjunction with the accompanying drawings. 
         FIGS. 1A-1E  show a first embodiment of a press tool according to the invention in cross-sectional view. 
         FIGS. 2A and 2B  show a second embodiment of a press tool according to the invention. 
         FIGS. 3A-3C  show a third embodiment according to the invention in cross-sectional view. 
         FIGS. 4A and 4B  show a fourth embodiment of a press tool according to the invention. 
         FIG. 5  shows a fifth embodiment according to the invention of a press tool in cross-sectional view. 
         FIGS. 6A-6C  show a sixth embodiment in cross-sectional view of the invention. 
         FIGS. 7A and 7B  show a seventh embodiment of a press tool according to the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIGS. 1A-1E  show a first embodiment  1  according to the invention. A tool  2  is inserted into a receiving structure  3  ok a folding press. The tool  2  has a safety member  4 , which is rigidly connected to an actuating member  5 . The actuating member  5  is guided by a guide member  6 . A spring  7  urges the actuating member  5  to its starting position, as shown in  FIG. 1A . The safety member  4  protrudes beyond and out of the surface of the receiving structure end. However, it is also possible that the safety member lies in the top surface but still extends and protrudes beyond the now surface plane without departing from its intended function. 
     In  FIG. 1B  the tool  2  is inserted into the receiving structure  3 . The safety member  4  is pressed inwardly as a result of the beveled portion. 
     In  FIG. 1C  the tool  2  is shifted a bit downward such that the actuating member  5  is shifted into a second direction relative to the tool body  2 , that is perpendicular to the length of the receiving structure  3 . As a result the actuating member  5  is blocked by a cam  10  and prevents operating of the actuating member  5 . 
     In  FIG. 1D  the tool  2  is clamped by the receiving structure  3 . This is clear from  FIG. 1D  in that the top portion  8  of the tool  2  is in abutment with the ceiling of the cavity in the receiving structure  3 . The safety member  4  extends into a cavity  9  and prevents the tool from falling out of the receiving structure  3  as soon as the clamping force is removed. This is shown in  FIG. 1C . 
     If the tool  2  has to be removed from the receiving structure  3 , the clamping force is removed and the tool  2  has to be maintained in the position shown in  FIG. 1E . Only in this position the actuating member  5  can be pressed inward, such that the safety member  4  can be retracted into the tool body. If the tool  2  is not maintained in the position shown in  FIG. 1E , the tool  2  will slide downward into the position, shown in  FIG. 1C . In this position the actuating member  5  is blocked by the cam  10  and operating of the actuating member  5  is prevented. 
       FIGS. 2A and 2B  show a second embodiment  20  of a press tool according to the invention. The tool  20  has a body  21  and a receiving structure end  22 . In this receiving structure end  22  a safety member  23  is arranged, which is rigidly connected to an actuating member  24 . The actuating member  24  is guided by a guide member  25 . The actuating member  24  can be displaced in a vertical direction and in a horizontal direction in line with the guide member  25 . A leaf spring  26  urges the actuating member  24  downwardly, while the coil spring  27  urges the actuating member and consequently the safety member  23  out of the body  21 . 
     The body  21  has a cam  28  and cam  29 , which prevent the actuating member  24  to be operated by accident. An operator first has to move the actuating member  24  up to a center position in between both cams  28 ,  29 , after which the actuating member  24  can be pressed inwardly and as a result the safety member  23  can be operated (see  FIG. 2B ). 
       FIGS. 3A-3C  show a third embodiment  30  of a tool according to the invention. This tool has a body  31  and a receiving structure end  32 . A safety member  33  is arranged in the tool body  31  and can be operated by the actuating member  34 . The actuating member  34  is guided by a guide member  35  and urged by a coil spring  36  towards its position as shown in  FIG. 3A . The actuating member  34  has an operating portion  37 , which can be displaced in a second direction. The operating portion  37  is urged downwardly by a leaf spring  38 . 
     The body  31  acts as a cam, when the operating portion  37  is in the position as shown in  FIG. 3A . This prevents operation of the actuating member  34  by accident. An operator has to move the operating portion  37  of the actuating member  34  upwardly in order to be able to press the actuating member inwardly and as a result to operate the safety member  33  (see  FIGS. 3B and 3B ). This embodiment has the advantage that the safety member  33  is not shifted within the tool body  31  and that operation of the actuating member does not depend on the position of the tool in the receiving structure. 
       FIGS. 4A and 4B  show a fourth embodiment  40  of the invention. The embodiment  40  has a tool body  41  and a receiving structure end  42 . In the receiving structure end  42  a safety member  43  is arranged, which is operated by an actuating member  44 . This actuating member  44  is guided by a guide member  45  and urged to the position as shown in  FIG. 4A  by spring  46 .  FIG. 4B  shows a side view of the embodiment  40 . A slide member  47  is arranged and has an opening  48 . This slide member blocks in the shown position the guide member  45 , such that the actuating member  44  cannot be operated. Only after sliding the slide member  47  the actuating member  44  can be operated and as a result the safety member  43  can be retracted into the receiving structure end  42 . 
       FIG. 5  shows a fifth embodiment  50  according to the invention. The tool  50  has a body with a receiving structure end  52 . This receiving structure end  52  has a safety member extending, which safety member is guided by a guide pin  54 . The safety member  53  is actuated by an actuating member  55  which is in turn guided by a guide member  56 . Behind the guide member  56  a spreading member  57  is present, which spreading member  57  has fingers  58 . The fingers  58  are extending towards the axis  51  of the spreading member  57 . A spreading actuating member  59  can be pressed into the spreading member  57  such that the fingers  58  are bent outwardly and provide a passage way for the guide member  56 . Now the actuating member  55  can be pressed and the guide member  56  will slide through the spreading member  57 . 
       FIGS. 6A-6C  show a sixth embodiment of a tool according to the invention. This embodiment  60  has a tool body and a receiving structure end  62 . The receiving structure end  62  has a safety member  63  which can slide into the receiving structure end  62 . The safety member  63  is urged by a coil spring  64 . 
     The tool  60  has furthermore an actuating member  65 , which can be slided into the tool body independent of the safety member  63 . The actuating member  65  is guided by a guide member  66 . 
     A leaf spring  67  is with one side arranged in the tool body  61 . A lever actuating member  68  is coaxially arranged with the guide member  66  and urged by a spring  61 . 
     In  FIG. 6A  the lever  67  is disengaged and when the actuating member  65  is operated the safety member  63  remains in its shown position. 
     In  FIG. 6B  the lever actuating member  68  is pressed such that the lever  67  deforms and engages into a cavity  69  of the safety member  63 . When actuating member  65  is pressed (see  FIG. 6C ) it pushes against the lever  67  taking along the safety member  63 . 
       FIGS. 7A and 7B  show a seventh embodiment of a press tool  70  according to the invention. This embodiment resembles the embodiment according to  FIGS. 4A and 4B . 
     The tool  70  has a receiving end  72 , in which a safety member  73  is arranged, which is urged by spring  74  towards its extended position. 
     An actuating member  75  is urged by a spring  76  into the position shown in  FIG. 7A . The actuating member  75  can push the safety member  73  into a retracted position. 
     The safety member  73  is however freely movable, such that the tool  70  can be inserted into a receiving structure independent of the state of the actuating member  75 . 
     The actuating member  75  is guided by a guide pin  77 , which can be blocked by slide member  78 . As shown in figure  7 B the slide member  78  is also spring loaded by spring  79 , such that the slide member  78  is always urged towards the blocking position. So the actuating member  75  is always immobilized, unless the slide member is expressly moved towards the unblocking position enabling the actuating member  75  to be pressed inward and operating the safety member  73 . 
     The freely movable safety member configuration as shown in  FIGS. 7A and 7B  can likewise be incorporated in the embodiments shown in  FIGS. 3 ,  4  and  5 .