EP1114717A2 - Hand-actuated press wth emergency unlocking button - Google Patents

Abstract

A manually operated press with a manually pivotable actuating lever for the press and return stroke of the press has a mechanical return stroke lock, which only releases the return stroke when a lower end point of the press stroke is reached. The return stroke lock comprises a cam disc (29) connected to the actuating lever in a rotationally fixed manner, in which a groove-like control cam (35) is arranged, into which a spring-loaded locking pin (28) engages, for which at least one locking projection (45, 46) engages in the control cam (35) ) is arranged so that the locking pin (28) can pass through the control cam (35) only in one operating direction (36, 37, 38). An opening (51, 52) is provided on each locking projection (45, 46), in which an unlocking pin, which can be actuated from the outside, is seated, via which the locking bolt (28) can be axially disengaged from the locking projection (45, 46), so that he can also pass through the control cam (35) against the operating direction (36, 37, 38) (Fig. 2). <IMAGE>

Description

The present invention relates to a hand operated press with a manually swiveling operating lever for press and return stroke of the press and a mechanical return stroke lock, that the return stroke only when a lower end point of the Press stroke releases, the return stroke lock with a rotationally fixed comprises the cam connected to the operating lever, in the a groove-like control curve is arranged, in which a spring-loaded Latching pin engages, for at least in the control curve a locking projection is arranged so that the locking bolt the control curve can only run in one operating direction, with an opening leading from the outside into the control curve.

Such a manually operated press is known from EP 0 622 175 B1 known.

Such hand-operated presses, mainly in the piece work applied, require an effort, which to End of the press stroke increases. The operators tend therefore to carry out the work or press stroke only incompletely and the relaxation or return stroke before reaching it the intended lower dead or end point of the press ram initiate. This leads to the incomplete conclusion Work process to committee or at least inferior Quality of the pressed items.

In order to prevent this, the known press has a mechanical one Return lock on a cam with a groove-like Control cam includes a spring-loaded locking pin intervenes. The control curve consists of several sections, two of which are circumferential, the third essentially radially inwards and the fourth radially outwards and leads extensively back to the first section. Between a latching projection is provided for the first and the second section, the locking bolt only in the direction of the first one can overcome the second section.

The locking bolt itself is spring-loaded in the axial direction a sliding block mounted, which in turn is spring-loaded in radial Direction is movable.

In the course of the working stroke of the press, the locking bolt runs open the bottom of the groove first from the first to the second Section. If the second section is reached, the operator can do not move the operating lever up again, since the locking pin then abuts against the locking projection and another movement of the non-rotatable with the operating lever connected cam disc prevented. Only with further movement the cam in the operating direction and thus the actuating lever the locking pin goes down into the third Curve area and becomes radial there together with the sliding block moved inward. The return stroke is now possible Locking bolt runs circumferentially in the fourth section of the curve back and radially outward until it is the first again Section of the curve reached.

This ensures that the press stroke first is fully executed before the return stroke is initiated can.

Due to incorrect arrangement of the workpieces to be pressed and / or due to faulty workpiece tolerances However, it always happens that the press stroke is not complete can be carried out due to the dimensions and / or the arrangement of the workpieces is when the lower end point is reached the press stroke not possible. To now take this To enable defective workpiece is in the control curve A curved slot is accessible from the outside, which the makes the second and third sections of the control curve accessible. If the press "jams" in the manner described can with a thin object from the outside through the Slot axially push the locking pin back, so that the control curve can already be turned back, the locking bolt runs against the operating direction in the control cam.

Although this arrangement makes both an efficient return stroke barrier is provided, as well as unlocking in the event of an error is possible, the known backstop lock nevertheless a whole host of disadvantages with the unlocking in the event of an error.

On the one hand, it is disadvantageous that the Control curve is provided by a relatively large slot the dirt from the outside in the return lock, especially in the Control curve, can penetrate. In this way it is possible that the control curve is so far clogged with dirt, chips etc. is that the locking pin against the locking projection Can overcome operating direction.

Another disadvantage is that the release of the Locking bolt relatively complicated due to the thin object is, it comes e.g. again and again that the object of the Locking bolt slips off before it overcomes the locking projection has, so that the unlocking process can be repeated several times must before it is successful. This is especially true of Disadvantage if the object and / or the locking pin smeared with oil are. Such lengthy unlocking processes are not particularly useful in connection with piecework.

The type of unlocking selected is particularly problematic however, in the event that an operator is due to a Inattention with fingers, hand or other skin between the Press ram and the workpiece to be machined, because at Execution of the press stroke then jams the skin, which too serious injury. Especially in such an emergency is the unlocking option provided in the known press very disadvantageous because it turned out that the operator often does not have the patience with the small object in the slot after the Look for locking bolts to unlock them. In their need the operator then often pulls out the hand jerkily the press, leading to the serious injuries mentioned can.

Against this background, it is an object of the present invention to further develop the press mentioned at the outset in such a way that the return stroke lock is easier with a structurally simple construction is unlocked.

According to the invention, this object is achieved in the above-mentioned manually operated press solved in that at each locking projection an opening is provided in which an externally operable Unlocking pin sits over which the locking pin can be axially disengaged from the locking projection, so that he also run through the control curve against the operating direction can.

The main advantage of this measure is that the outside of the Cam protrudes a release pin that at any time is accessible without first having to be introduced. Thereby, that the unlocking pin in the area of the locking projection is arranged, he always meets the one attached to the Locking projection located locking pin.

The inventors of the present application have recognized that that a slot-like opening in the groove bottom of the cam is not absolutely necessary, a release pin is sufficient receiving bore in the area of the locking projection off because of an error as described above the locking bolt is in contact with the locking projection anyway, because the operator releases the operating lever immediately leads back up. This is done through a stop noticeable when moving the operating lever, whereupon the operator then only has the unlocking pin must press axially inwards, the locking pin is on everyone Case hit, slipping is also not to be feared.

If the opening is just a circular one, use the unlocking pin is precisely receiving opening is another advantage with this construction the avoidance of dirt connected, namely the control curve itself is from the outside no longer accessible, because the opening is opened by the unlocking pin locked.

It is particularly preferred if the unlocking pin is spring loaded.

It is advantageous here that the unlocking pin is in its starting position returns when the operator returns was released after the locking pin the locking projection has overcome against the direction of operation.

Overall, it is still preferred if the unlocking pin is arranged axially parallel to the locking bolt.

The advantage here is that the least effort is required is to axially push the locking pin out of the control cam.

Overall, it is preferred if the unlocking pin is used an emergency button, which is preferably connected is axially displaceable on the cam and further preferably on an outside of the cam attached guide sleeve, preferably with a Collar is provided, one shoulder on the emergency button assigned.

This measure has the advantage that a relatively thin one Release pin can protrude into the cam disc, that the unlocking pin outside with a relatively large Emergency control button is connected to the operator in the event of an error, only has to press uncontrolled. Consider one that the manual presses often with a Return spring connected to the press ram upwards pulls, so there are special advantages in the press pinched body parts. The operator then lets go Immediately release the actuating lever, whereupon the press ram is already moved upwards again until the The locking pin pushes against the next locking projection. With the The operator can now freely move the emergency actuation button press, causing the complete return movement of the press ram is released upwards.

A special advantage is then with the emergency button connected if several locking projections are connected in the control cam are, because all release pins can over the actuated an emergency actuation button and inserted it into the control cam become.

The arrangement of the emergency button on a guide sleeve with a collar has constructive advantages. Especially if the emergency button has a central recess, through which fasteners are accessible attach the guide sleeve to the cam disc namely a very simple assembly of the emergency manual release even on existing presses, even if these have mentioned slot in the groove bottom of the cam.

The unlocking pins can namely in the correct position to each other be attached to the emergency button, whereupon the guide sleeve is inserted through the emergency actuation button and is attached to the cam. By specifying the mounting holes e.g. screws are taken care of that the unlocking pins exactly in the area of the locking lugs engage the intended slot.

The central recess is then covered with a cover plate closed, so that even with this retrofit the advantage the avoidance of dirt in the control curve because the emergency operating button covers any that are still open Areas of the slot.

In general, it is still preferred if between the emergency button and cam provided at least one compression spring which is the emergency button against the collar of the guide sleeve presses.

This measure also has constructive advantages, it is no longer required, each release pin with a to provide their own "return spring", this is done by the Press the emergency button away from the cam Compression springs.

Further advantages result from the description and the attached one Drawing.

It is understood that the above and those below Features still to be explained not only in the respective specified combinations, but also in other combinations or can be used alone, without the scope of to leave the present invention.

Fig. 1

in einer schematischen Vorderansicht eine neue handbetätigte Presse;

Fig. 2

eine Draufsicht auf die Kurvenscheibe der Presse aus Fig. 1, in Fig. 1 von rechts gesehen; und

Fig. 3

in einer schematischen Schnittdarstellung die mechanische Rückhubsperre mit Not-Betätigungsknopf aus Fig. 1.

An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. Show it:

Fig. 1

in a schematic front view of a new hand-operated press;

Fig. 2

a plan view of the cam plate of the press of Figure 1, seen in Figure 1 from the right. and

Fig. 3

In a schematic sectional view the mechanical return lock with emergency actuation button from FIG. 1.

In Fig. 1, 10 is a hand-operated or operated Press referred to that a base part 11 and two upwards has pointing supports 13, on which a height-adjustable Headboard 14 is attached.

The press 10 also has an operating lever 15 which is rotatably connected to a shaft 16 around which the operating lever 15 can be pivoted.

The shaft 16 is in a manner not specified (toggle lever or rack) connected to a press ram 18 which a return spring 19 in its upper position shown in Fig. 10 is biased.

The press 10 serves a schematically indicated workpiece 21 with a workpiece 22, also indicated schematically press, for which purpose the actuating lever 15 moves downward is so that the press ram 18 its indicated at 23 Press stroke executes. After the press stroke 23 ends Press ram 18 supported by the return spring 19 in its Back shown in Fig. 1 top position, including the operating lever 15 is pivoted up again.

With such pressing of workpieces 21, 22, the greatest working pressure in the area of the operator lower end point of the press stroke 23 are exerted, so that straight with piecework the operators tend to the Do not move the operating lever 15 all the way down.

The possible faulty pressing of the workpieces To prevent 21, 22, the press 10 with a mechanical Return stroke lock 26 equipped, the return stroke 24 only then releases when the press ram 18 the lower end point of the Press stroke 23 has reached. The return stroke lock 26 includes a rotatably connected to the head portion 14 bearing plate 27, in the a locking pin 28 axially in a manner to be described in more detail and is arranged to be radially movable. The bearing disc 27 is a cam 29 assigned, in which the locking pin 28 in also intervenes to be described.

The cam disc 29 is rotatably connected to the shaft 16, so that when locked between the bearing plate 27 and cam 29 via the locking pin 28 of the actuating lever 15 cannot be moved up again.

To trigger the blocked mechanical return lock 26 e.g. to enable when two workpieces 21, 22 under have the press ram 18 jammed so that the lower one End point of the press stroke 23 cannot be reached is a Emergency actuation button 31 on the cam disc 29 via a guide sleeve 32 stored. In a way to be described in more detail causes a movement of the emergency button in Fig. 1 after on the right an unlocking of the return stroke lock 26.

In FIG. 2, the cam disk 29 from FIG. 1 is in a view shown from the right. In the illustration in FIG. 2, on the one hand to recognize an axle hole 33 with which the cam disc 29 the shaft 16 is non-rotatably fastened, with a control cam 35 can be seen, in which the also indicated as a circle Locking pin 28 engages. The locking bolt 28 passes through the Control curve 35 in the direction of an operating direction 36, 37, 38 indicating arrows on a self-contained path, where the arrow 37 indicates the reversal of the direction of rotation of the cam disk 29, that is, the state where the operating lever 15 completely after was pressed down and now supported by the return spring 19 goes up again to carry out the return stroke 24.

The control cam 35 comprises a first groove-like section 41, which extends extensively. At the first groove-like section 41 closes a second groove-like section 42 on, which also extends purely circumferentially. The second groove-like section 42 closes a third section 43, which extends substantially radially inwards. On the third section 43 is closed by a fourth, groove-like Section 44, which extends radially outward and circumferentially extends to the first section 41.

There is a locking projection between the first and the second section 42 45 is provided, which is formed in that the Section 42 is recessed deeper into the cam 29 than section 41. In this way, the locking pin 28 can Only overcome locking projection 45 in operating direction 36. In corresponding Way is a locking projection 46 between the second Section 42 and the third section 43 are provided so that the locking bolt 28, which by a spring in the bottom of the groove Control cam 35 is pressed, the locking projection 46 also can only overcome in operating direction 36. This will do so achieved that the second section 42 between the locking projection 45 and the locking projection 46 rises again slightly, while section 43 extends further into cam plate 29, than the section 44 in the region of the locking projection 46.

The section 44 then rises at its radially outward direction Movement with its groove bottom again, so that at 47 forms a stop that the locking pin 28 only in the direction can overcome the operating direction 38.

The locking pin 28 is not only spring-loaded in the axial direction, so that it is with its end face on the groove bottom along the control cam 35, it is also radially inward spring-loaded so that it reaches the third section 43 is automatically pushed radially inwards and in the operating direction 37 assumes its position shown in FIG. 2.

Due to the axial spring load, the cam can 29 in FIG. 2 can only be turned clockwise again, when the locking pin 28 has assumed its position shown in FIG. 2 Has. If the workpieces are now during the return stroke 21, 22 clamp so that the locking pin 28 e.g. in the area of the second section 42 and the third section 43 cannot reach because a continuation of the press stroke 23 and thus a further movement of the cam 29 counterclockwise in FIG. 2 is not possible, locks the locking pin 28 in the now prematurely initiated Return stroke 24 this movement by contacting the locking projection 45.

In order to move the cam disc 29 back again to enable is located in the area of the locking projection 45 an opening 51 through which a not shown in Fig. 2 Pin in Fig. 2 from behind on the locking pin 28 such acts that this against the force of the axially biasing him Spring is lifted out of the second section 42, so that he gets back into the first section 41 when the Cam 29 is rotated clockwise. A corresponding opening 52 is also in the area of Locking projection 46.

Based on the lateral and schematic sectional view in Fig. 3 will now be described, like the one just indicated Emergency manual release is set up and working.

In Fig. 3 it can first be seen that the locking pin 28 in a sliding block 54 sits and there axially via a spring 55 is so loaded that it is pushed to the left in Fig. 3 becomes. The sliding block 54 in turn sits radially behind outside-facing guide 56 under tension of a spring 57, which the sliding block 54 radially inwards towards the shaft 16 presses. In this way, the locking pin 28 is axially outward and spring loaded radially inward so that it is in motion the cam plate 29 follows the control cam 35, from which in 3 dashed and schematic sections 41, 42 and 43 are indicated. 3 is now in the sectional view easy to see that between sections 41 and 42 as well 42 and 43 are each formed stages with which the locking bolt 28 comes into contact if it runs counter to the operating direction can be moved through the control curve 35 from FIG. 2 should. It can also be seen that the depth of the groove in the area of section 42 on section 43 decreases again, whereby the step or the corresponding locking projection is formed becomes.

Sit in the two openings 51, 52 described in FIG. 2 Release pins 58 and 59, respectively, which are pushed to the right in FIG. 3 can be, whereby the locking pin 28 against the Force of the spring 55 is also pushed to the right so that he overcome the corresponding level in the control curve 35 can. The unlocking pins 58, 59 are already in the Fig. 1 known emergency button 31 arranged on the also a plurality of compression springs 61 are stored, of which in Fig. 3 two are shown. The compression springs 61 sit between the cam 29 and the emergency button 31 so that by the compression springs 61, the unlocking pins 58, 59 in Fig. 3 are biased to the left, which are otherwise axially parallel are arranged to the locking bolt 28.

The emergency button 31 is axially displaceable on the cam 29 arranged in that it is captive on a guide sleeve 62 fastened from the outside to the cam disk 29 sits. For this purpose, the emergency button 31 is with provided a stepped bore 63, the diameter of which is in Fig. 3 gradually increased to the left. At the transition from the smallest to the second smallest diameter is the emergency button 31 a shoulder 64 on which the guide sleeve 62 rests with a collar 65. This ensures that the emergency button 31 not by the Compression springs 61 pushed too far to the left from the cam plate 29 becomes.

If the emergency actuation button 31 is pushed to the right in FIG. 3, so the unlocking pins 58, 59 in the Sections 42, 43 moved in, this movement thereby it is possible that in Fig. 3 on the left above the collar 65 Free space 66 is provided, into which the collar 65 enters, when the emergency button 31 on the cam 29 is moved to.

The emergency operation button 31 also has one by one Cover 67 closed recess on which when installing the Emergency button 31 on the cam 29 first remains open to the attachment of the guide sleeve 62 on the To enable cam 29. For this purpose are in one Outer wall 68 of the guide sleeve 62 axially extending through holes intended for fastening screws, of which in Fig. 3 is indicated at 69.

The assembly is carried out in such a way that the compression springs 61 first as well as the unlocking pins 58, 59 on the emergency operating button 31 are set before the left in Fig. 3 Guide sleeve 62 pushed through the stepped bore 63 becomes. Then this arrangement is from the left on the cam 29 placed and screwed by means of the screws 69. there care must be taken that the unlocking pins 58, 59 in the engage corresponding openings 51, 52. Through the compression springs 61 the emergency button 31 is now against the collar 65 pressed. The recess is then covered by the lid 67 closed.

Finally, it should be noted that in the embodiment shown exemplary two locking projections for the locking bolt 28 are shown, of course, the cam 29 also only one or more than two locking projections exhibit.

Claims (9)

Manually operated press (10) with a manually pivotable actuating lever (15) for press (23) and return stroke (24) of the press (10) and a mechanical return stroke lock (26), which the return stroke (24) only when a lower end point of the Press stroke (23) releases, the return stroke lock (26) comprises a cam (29) connected to the actuating lever (15) in a rotationally fixed manner, in which a groove-like control cam (35) is arranged, in which a spring-loaded locking pin (28) engages, for which at least one locking projection (45, 46) is arranged in the control cam (35), so that the locking bolt (28) can only pass through the control cam (35) in one operating direction (36, 37, 38), with an opening (51 , 52) leads into the control curve (35),
characterized in that an opening (51, 52) is provided on each locking projection (45, 46), in which sits an unlocking pin (58, 59) which can be actuated from the outside and via which the locking bolt (28) axially disengages from the locking projection ( 45, 46) can be brought so that it can also pass through the control cam (35) against the operating direction (36, 37, 38). Hand-operated press according to claim 1, characterized in that that the unlocking pin (58, 59) is spring-loaded is. Hand-operated press according to claim 1 or 2, characterized in that the unlocking pin (58, 59) axially parallel to the locking bolt (28) is arranged. Hand-operated press according to one of claims 1 to 3, characterized characterized in that the unlocking pin (58, 59) is connected to an emergency actuation button (31). Hand-operated press according to claim 4, characterized in that that the emergency button (31) is axially displaceable is arranged on the cam disc (29). Hand-operated press according to claim 4 or 5, characterized in that that the emergency button (31) cannot be lost attached to the cam disc (29) from the outside Guide sleeve (32; 62) sits. Manually operated press according to claim 6, characterized in that that the guide sleeve (32; 62) with a collar (65) is provided, that of a shoulder (64) on the emergency actuation button (31) is assigned. Hand-operated press according to claim 6 or 7, characterized in that the emergency button (31) is a central Has recess through which fasteners are accessible, the guide sleeve (32; 62) on the cam disc (29). Hand-operated press according to one of claims 5 to 8, characterized characterized in that between the emergency button (31) and cam disc (29) at least one compression spring (61) is provided, against the emergency button (31) presses the collar (65) of the guide sleeve (32; 62).

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