Claims:1. An improved locking/ unlocking system for a pair of blow mold holders having a fixed blow mold holder (1) and a movable mold holder (2) to lock/unlock consisting of
-Lock Nut 14, 16, 20- a pair of Extension Rod - 13,19-Sensor bush mounting screw 12, -Sensor bush 18, -Lock rod nut 16, -Self-Align Coupler 21, Lock Cylinder 22, 1st FT Guide Bush 40, -2nd FT Guide bush 38, -3rd FT Guide Bush 36, -MT Guide Bush 39, -MT Guide Bush 37, -Top Dowel Pin 45, -MT Middle Dowel pin 44, -MT middle Dowel pin 43, -Bottom Dowel Pin 42, -Extension Rod 2, Lock rod 15, -Grub Screw 28, 29, 30, Toggle Shaft 3, Fixed Toggle (Moulding Holder) 1, -Moving Toggle (Moulding Holder) 2, Stopper Bush 23, 25, and Shock Absorber 24,
a set of guide bushes (36-40) having lock holes,
-a set of lock rod bushes 17 with lock holes with fasteners
-a lock rod 15 is connected through the lock holes of the guide bushes 17 and lock holes of lock rod bushes 17 and fasteners
- a set of grub screws (28,29,30) with slotted type dowel pins inserted movably with guide bushes on each blow mold holder (1, 2)
- a set of lock pneumatic cylinders 22 connected to each blow mold holder (1, 2)perpendicularly to each other,
-wherein the locking of the pair of blow mold holders is performed by actuating the lock cylinder 22 thereby the dowel pins 42,43,44,45 move upward to lock the blow mold holders (1, 2)
-wherein the dowel pins 42,43,44,45 move freely inside the guide bushes upward to lock the blow mold holders,(1, 2)
-wherein the lock cylinder 22 actuates it controls the dowel pins located on either side of the molding holder contains encompasses bushed ribs, in such a way that the dowel pins are aligned inline about its axis and held on its lowermost position individually, before energizing the lock mechanism.
-wherein air pressure of blow mold holders (1,2 )is evenly distributed by locking arrangement locks the blow mold holders characterized by the zig-zag arrangement of lock ribs on either side of the molding holders diminishes the force exerted while on blowing which ensures the rigid locking arrangement while blowing and clamping operations hence the stability is attained while blowing operation.
-wherein hinge point of blow mold holders is made with an arrangement consisting of toggle shaft 3 and bushes(31-35) and thrust bearing 9 distributes the air pressure evenly by, the intact movable dowel pins to the molding holder by the contact pressure on the pins.
-wherein locking the pair of blow mold holder is performed by the dowel pins which is held & aligned about the axes and embedded guide bushes on either side of the blow mold holders. Wherein the dowel pins have the internal grooved arrangements in such a way to hold on the guide bushes with the help of grub screws its lower proximal positions. By energizing the lock cylinder, it actuates and raises the held dowel pins to maximum vertical level, hence the locking is performed on the zig-zag embedded rib which rigidly locks the molding holder.
-wherein unlocking the pair of blow mold holders is performed by de-energizing the lock cylinder which de-actuates the dowel pins which is held in the locked position either by lock rod or opposing pneumatic actuation cylinder on the vertical axes of the molding holder.
2. The improved locking/ unlocking system for a pair of blow mold holders as claimed in claim 1, wherein the said dowel pins are actuated by pneumatic cylinders.
3. The improved locking/ unlocking system for a pair of blow mold holders as claimed in claim 1, wherein explosion of the preform is avoided by the said lock/unlock arrangement by closely held together of mold cavities as well mold holders on its position, thus the clearance due to declamping is minimized by said mechanism, therefore rigid clamping is achieved thereby explosion is avoided under the high pressurized fluid.
4. The improved locking/ unlocking system for a pair of blow mold holders as claimed in claim 1, wherein the said lock/unlock arrangement is axial and parallel to the blow mold axis.
, Description:FIELD OF INVENTION
The present invention relates to an improvement of lock and unlocks arrangement for blow molding apparatus, more particularly, an improved locking /unlocking arrangement for blowing the molding machine
BACKGROUND OF THE INVENTION
In general a blow-molding machine and in particular, a stretch blow-molding machine usually includes several blowing stations in which the plastic preforms are blown into plastic containers by applying an internal pressure. An important component of a blowing station is here the locking mechanism. This mechanism connects and/or locks the two mold carrier halves during the blowing process. Upon completion of the blowing process, the lock opens and the container can be removed upon opening of the mold and a new plastic preform can be introduced. This locking mechanism usually includes a pivotable element that, upon a pivoting movement, engages in a further element. There are so many inventions that exhibit a plurality of locking and unlocking arrangements
In JP4791643B2, a plurality of connecting bolts the second is slidably penetrate the holder extending in the moving direction of the second die, at least two The connecting bolt penetrates and is supported by the connecting bolt, and a plate member locked to the head provided at the rear end of each connecting bolt, and the connecting bolt that supports the plate member at a position different from that of the connecting bolt. A coil spring interposed between the plate member and the second holder and biasing the second mold in its retreating direction, The coil spring is set to a biasing force that allows the second mold to come into contact with the first mold when air is injected into the air injection chamber when the first mold and the second mold come into contact with each other, a predetermined gap is maintained between the plate member and the second holder.

In US6923636B2, the blow-molding machine that can for example be operated under clean-room conditions, the drive unit of the blow-molding machine according to the invention is configured for the clamping elements of the mold closing and locking device as an electromotive direct drive with a spindle drive and a spindle mechanism with recirculating rollers.
In 8915729, A blow mold for containers wherein the mold base comprises a first member (5) and a second member (6) connectable to each other employing a quick coupling system comprising at least one first connection pin, wherein second member (6) includes a first slider (13), defining a first sliding direction on a plane orthogonal to the longitudinal axis of the mold and capable of taking an unlocking position and a locking position, first slider (13) being provided with at least a hole to lock the first connection pin when the first slider (13) is in the locking position, and a second slider (16) defining a second sliding direction on the plane, intersecting the first direction; second slider (16) being slidable along the second direction from a position of mechanical connection with the first slider (13) to a position of releasing from the first slider.
In US8708681B2, the locking mechanism includes a first locking element that for locking cooperates with a second locking element, the first locking element is arranged to be movable by a moveable element, and the moveable element is supported using at least one bearing that is at least partially provided outside of the cleanroom.
But still, an improvement in the locking and unlocking arrangement is required to achieve more stability during blowing operation, capable of enabling distribution of the pressure evenly, and capable of preventing accidental explosion during blowing.

OBJECTIVES OF THE PRESENT INVENTION
The main objective of the present invention is to provide an improvement in the locking /unlocking mechanism for the blow molding machine.

Another objective of the present invention is to provide an improvement in the locking /unlocking mechanism of blow molding mechanism to establish more stability during molding the preforms
The other objective of the present invention is to provide an improvement in the locking /unlocking mechanism of the blow molding machines that can enable distributing the pressure evenly

Yet another objective of the invention is an improvement in the locking /unlocking mechanism of blow molding machine capable of preventing accidental explosion during blowing.

SUMMARY
The present invention relates to an improvement of lock and unlocks arrangement for blow molding apparatus, more particularly, an improved locking /unlocking arrangement for blow the molding machine, wherein the proposed improvement in the locking/ unlocking system for a pair of blow mold holders having a fixed blow mold holder (1) and a movable mold holder (2) to lock/unlock consisting of a novel actuation on both parallel and perpendicular axis of the blow molding machines to prevent breakage of the preform during blowing, lock ribs arrangement in a novel way for distributing the air/ fluid pressure evenly and dowel pins having the internal grooved arrangements in such a way to hold on the guide bushes with the help of grub screws its lower proximal positions, wherein when energizing lock cylinder actuates and raise the held dowel pins to maximum vertical level, thereby the locking is performed on the zig-zag embedded rib which rigidly locks the molding holder. during the unlocking, de-energizing the lock cylinder to de-actuate the dowel pins which are held in the locked position either by lock rod or opposing pneumatic actuation cylinder on the vertical axis of the molding holder.

DETAILED DESCRIPTION OF THE DRAWINGS
Fig 1 illustrates an isometric view of the lock assembly in unlock/open position
Fig-2 illustrates an isometric view of the lock assembly in an open position
Fig-3 Moulding Holder at Locked Position
Fig-4 Moulding Holder at Open Position
Fig 5 illustrates lock system with double cylinder actuation
Part List
1- Fixed Mould Holder
2- Movable Mould Holder
3- Toggle Shaft
4- Actuation Cylinder
5- Female Clevis
6- Male Clevis
7- Shock Absorber
8- T-Clamp
9- Thrust Bearing
10- Toggle Shaft Lock (Not Illustrated)
11- Toggle Open Cylinder
12- Sensing Bush Adjuster Screw
13- Extension Rod
14- Dowel Pin Nut
15- Lock Rod
16- Lock Rod Nut
17- Guide Bush
18- Sensor Bush
19- Self Align coupler Adjuster Nut
20- Self Align Coupler Nut
21- Self Align Coupler
22- Lock Cylinder
23- Stopper Bush Assembly 1
24- Shock Absorber
25- Stopper Bush Assembly 2
26- Mould Cavity Left
27- Mould Cavity Right
28- Grub Screw 1
29- Grub Screw 2
30- Grub Screw 3
31- Bush 1
32- Bush 2
33- Bush 3
34- Bush 4
35- Bush 5
36- Dowel Pin 1
37- Dowel Pin 2
38- Dowel Pin 3
39- Dowel Pin 4
40- Dowel Pin 5
41- Lock Cylinder Mounting Hole
42- Actuator Dowel Pin
42.1-Lock Pin Mounting Hole
43- Dowel Pin 2
43.1-Dowel pin slot-1
44- Dowel Pin 3
44.1- Dowel pin slot-2
45- Dowel Pin 4
45.1- Dowel pin slot-3

DETAILED DESCRIPTION OF THE PRESENT INVENTION

Referring to Fig 1 and 2, the main aim of the locking system is to attach and detach the molding holders to rigidly clamp the mold cavities located inside of it. While clamping and blowing operations of the blow molding station it retains the mold cavities on its closed position. It is done employing the zig-zag arrangements of the ribs on either side of the mold holder system about its locking axis, in such a way the arrangement of the framework is done to hold the mold cavities inside it.

The provisions for the locking arrangement are made on those ribs itself. The sliding bushes within the intrinsic hole arrangement provided in it, a tight fit arrangement of the bushes over the fixed and moving mold holders is done on the ribs in such a way the ribs are constructed. In the present invention the novel arrangement of the locking pins on the fixed and moving mold holders is shown in the figure-1.

The locking of the mold holders [1&2] is done by the locking mechanism by an external source that operates the embedded lock pins on the ribs. The lock pins are arranged inside the bushes which are moving actuators of the locking mechanism which enables and disables the molding holders while in operation. In such a way the dowel lock pins are arranged to slide over the bushes located on the molding holders [R1, R2, R3, R4 & R5]. The ribs of the mold holders are having different length bush and lock pin arrangements that are embedded in them.

The process of closing (Locking) molding holder is shown in the figure-4
The lowermost dowel lock pin [42] is powered externally to actuate and hold on its lowermost position to a maximum vertical extent inside the bush on the fixed rib [R5]. Above which the dowel lock pin [44] is held on its position with the aid of grooves [44.1] provided on the dowel pin arrangement [44] is held employing then grub screw [30] provided on the fixed toggle [1]. On the topmost portion of the fixed toggle on the rib [R1] an aligning bush with a fastened mounting holder is provided to mount the actuation mechanism / electro-pneumatic cylinder on the top/bottom-most portion of the ribs R1/R5.
In the fixed mold holder [1] the grub screw is fastened via the bushed arrangement [38] which is tightly embedded on the rib, the grub screws[30] act as a partial movement restrictor as well the holder of the dowel lock pin [44] on its lowermost position during the open condition. Similarly, the bushes[36,38,40] and pins[42,44] are held on the ribs about the central axis of the ribs[R1, R3, R5].
Similarly, on the moving mold holder[2] there are two projected ribs [R2, R4] in which the bushes[ 37,39] are press-fitted and dowel lock pins[43,45] are held on their lowermost position with the help of grub screws[28,29] provided on it. The grub screws provided on either side of the ribs act as a lock for the dowel lock pins [28, 29 & 30] and are held at their lowermost position during the open state. The dowel pins [43, 44, 45] are freely suspended without any connections it is held on its lowermost position utilizing the grub screws[28,29,30] and slotted grooves [ 43.1,44.1,45.1]arrangement provided on it. This acts as a holder for the dowel pin and an easy design for maintainability. During the actuation of molding holders, all the dowel pins reside [42, 43, 44, 45] on its lowermost position of each rib and while swaying of the moving molding holders the grub screws [28, 29 & 30] held the Dowel lock pins[43,44,465] in its position without dropping from the bushed arrangement. At this stage, the mold holders are in open condition.

After moving mold holder is fully reached and aligned to the central axis with the help of shock absorbers[ 24 ] and stopper bushes [23,25 ]provided on either side of the mold holder arrangement. The energizing of the bottom-most dowel pins is actuated employing the mechanical actuation or electro-pneumatic cylinder arrangement.

The process of closing (lock) molding holder is shown in the figure-3
During the locking of the mold holder both the mold holders are aligned by closing the moving mold holder [2]. After closing of the mold holder the locking of the mold holder by energizing the lock cylinder/ electro-mechanical actuation system the dowels lock pin are raised intact with the above dowel lock pins which engage the subsequent dowel lock pins. Hence the locking of both the molding holders is achieved by the Dowel pins by rising to its maximum vertical position until the clamping and blowing operations are performed. Once blowing operations are completed then the release of the molding holder is done by unlocking the bottom-most dowel lock pin and the topmost lock cylinder which disengages the series of lock pins by gravity as well ensuring by means of the actuator lock rods provided on either side of the fixed molding holder ribs [ R1,R5].

By engaging and disengaging of the pins on either side of the mold holder the locking and unlocking of the mold holders are done effortlessly and to restrain the huge force during operations was done.

Fig-3 Moulding Holder at Locked Position wherein a set of guide bushes (36-40) having lock holes, a set of lock rod bushes 17 with lock holes with fasteners -a lock rod 15 is connected through the lock holes of the guide bushes 17 and lock holes of lock rod bushes 17 and fasteners a set of grub screws (28,29,30) with slotted type dowel pins inserted movably with guide bushes on each blow mold holder (1, 2) - a set of lock pneumatic cylinders 22 connected to each blow mold holder (1, 2)perpendicularly to each other, wherein the locking of the pair of blow mold holders is performed by actuating the lock cylinder 22 thereby the dowel pins 42,43,44,45 move upward in order to lock the blow mold holders (1, 2) wherein the dowel pins 42,43,44,45 move freely inside the guide bushes upward in order to lock the blow mold holders,(1, 2) wherein the lock cylinder 22 actuates it controls the dowel pins located on either side of the molding holder contains encompasses bushed ribs, in such a way that the dowel pins are aligned inline about its axis and held on its lowermost position individually, before energizing the lock mechanism wherein air pressure of blow mold holders (1,2 )is evenly distributed by locking arrangement locks the blow mold holders characterized by the zig-zag arrangement of lock ribs on either side of the molding holders diminishes the force exerted while on blowing which ensures the rigid locking arrangement while blowing and clamping operations hence the stability is attained while blowing operation. wherein hinge point of blow mold holders is made with an arrangement consisting of toggle shaft 3 and bushes(31-35) and thrust bearing 9 distributes the air pressure evenly by, the intact movable dowel pins to the molding holder by the contact pressure on the pins. wherein locking the pair of blow mold holders is performed by the dowel pins which is held & aligned about the axes and embedded guide bushes on either side of the blow mold holders. Wherein the dowel pins have the internal grooved arrangements in such a way to hold on the guide bushes with the help of grub screws its lower proximal positions. By energizing the lock cylinder, it actuates and raises the held dowel pins to maximum vertical level, hence the locking is performed on the zig-zag embedded rib which rigidly locks the molding holder.
Fig 4 illustrates unlocking the pair of blow mold holders is performed by de-energizing the lock cylinder which de-actuates the dowel pins[44, 43] which is held in the locked position either by lock rod [15] or opposing pneumatic actuation cylinder on the vertical axes of the molding holder.
Fig 5 illustrates the operating or actuating cylinder 22A, 22B exhibits an embodiment in the present invention that the operating cylinder is incorporated axially at either end of the blow holding machine, in one aspect and in another aspect the actuating cylinder is perpendicular (11) the blow molding machine. Where It is one of the main embodiments is that the lock/unlocking assembly is performed by the actuating cylinder either parallel or perpendicular to the blow holding machine.

Fig 1-5, illustrates the following that an improved locking/ unlocking system for a pair of blow mold holders having a fixed blow mold holder (1) and a movable mold holder (2) to lock/unlock consisting of a set of guide bushes (36-40) having lock holes,a set of lock rod bushes 17 with lock holes with fasteners a lock rod 15 is connected through the lock holes of the guide bushes 17 and lock holes of lock rod bushes 17 and fasteners a set of grub screws (28,29,30) with slotted type dowel pins inserted movably with guide bushes on each blow mold holder (1, 2), - a set of lock pneumatic cylinders 22 connected to each blow mold holder (1, 2)perpendicularly to each other, wherein the locking of the pair of blow mold holders is performed by actuating the lock cylinder 22 thereby the dowel pins 42,43,44,45 move upward in order to lock the blow mold holders (1, 2) wherein the dowel pins 42,43,44,45 move freely inside the guide bushes upward in order to lock the blow mold holders,(1, 2), -wherein the lock cylinder 22 actuates

it controls the dowel pins located on either side of the molding holder contains encompasses bushed ribs, in such a way that the dowel pins are aligned inline about its axis and held on its lowermost position individually, before energizing the lock mechanism, wherein air pressure of blow mold holders (1,2 )is evenly distributed by locking arrangement locks the blow mold holders characterized by the zig-zag arrangement of lock ribs on either side of the molding holders diminishes the force exerted while on blowing which ensures the rigid locking arrangement while blowing and clamping operations hence the stability is attained while blowing operation.

The hinge point of blow mold holders is made with an arrangement consisting of toggle shaft 3 and bushes(31-35) and thrust bearing 9 distributes the air pressure evenly by, the intact movable dowel pins to the molding holder by the contact pressure on the pins.
wherein locking the pair of blow mold holder is performed by the dowel pins which is held & aligned about the axes and embedded guide bushes on either side of the blow mold holders. Wherein the dowel pins have the internal grooved arrangements in such a way to hold on the guide bushes with the help of grub screws its lower proximal positions. By energizing the lock cylinder, it actuates and raises the held dowel pins to maximum vertical level, hence the locking is performed on the zig-zag embedded rib which rigidly locks the molding holder.
The process of unlocking the pair of blow mold holders is performed by de-energizing the lock cylinder which de-actuates the dowel pins which is held in the locked position either by lock rod or opposing pneumatic actuation cylinder on the vertical axes of the molding holder The dowel pins are actuated by pneumatic cylinders. the preform is avoided by the lock/unlock arrangement by closely holding together of mold cavities as well mold holders on its position, thus the clearance due to declamping is minimized by mechanism, therefore rigid clamping is achieved hence the explosion is avoided under the high pressurized fluid. And now the assembly for lock/unlock arrangement is axial and parallel to the blow mold axis.
ADVANTAGES
By implementing the novel inventive locking mechanism the following benefits are achieved over the existing mechanisms.
Rapidly achieve the locking and unlocking of molding holders hence higher productivity is achieved by minimizing the operable time duration.
A lesser complication in construction and operative arrangements while compare to the existing mechanism of locking.
Compact design for operation and maintainability and serviceability.
Independent and ready to replaceable & serviceable mechanism enables easier serviceability.
Very low frictional resistance while locking and unlocking due to intact self-aligning dowel lock pins.
Operated effortlessly with very low energy requirement to hold and resist very huge force excreted while clamping and blowing operations.
Compactly mounted and embedded on the mold holder itself reduces the complex framework.
Restriction free wide open close independently movable lock arrangement for flexibility in operation.
Safe operating environment while locking and unlocking the mold holders.
The foregoing invention can now be practiced by those skilled in the art. Such skilled persons will know that the invention is not necessarily restricted to the particular embodiments presented herein. The scope of the invention is to be defined by the terms of the following claims as given meaning by the preceding description