JP4125911B2 - Variable lever tumbler lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a variable lever tumbler lock, and more particularly to a novel variable lever tumbler lock that can easily and reliably change a key difference with a simple operation.
[0002]
[Prior art]
The present applicant has previously proposed a novel variable lever tumbler lock that can be changed with a simple operation by improving the conventional lever tumbler lock with Japanese Patent Application No. 2001-379268.
[0003]
Since the structure and operation of this variable lever tumbler are described in detail in the specification of the above-mentioned previous application, a brief description will be given here. As shown in FIG. 1, the lever tumbler 11 is superposed on each other in a substantially C shape. While the tumbler A11A and the tumbler B11B are combined, the support shaft 12 biased upward in the figure is supported so as to be rotatable about the axis of the eccentric shaft 13 projecting from both ends thereof.
[0004]
On the other hand, the tumbler A11A whose one end is loosely fitted to the support shaft 12 is formed with an engaging portion 16 with the keyway of the key, and is urged in a direction that interferes with the key, counterclockwise in FIG. Further, the unlocking notch 9 is formed on the outer edge of the free end portion of the tumbler B11B having one end pivotably fitted to the support shaft, and the portion overlapping with the engaging side edge of the tumbler A11A Is formed so as not to interfere with the key.
[0005]
On the other hand, the engagement protrusion 18 is provided on the side of the tumbler A11A facing the tumbler B11B at the inner edge of the free end portion, and the tumbler A is engaged on the inner edge of the tumbler B11B on an arc centering on the support shaft 12. A plurality of engaging recesses 19 that can be engaged with the mating protrusions 18 are formed, and the angle of formation of the engaging recesses is set in a plurality of types of key grooves formed at the side edges of the mating key. When the engaging portions are engaged with each other, they are set so as to be aligned with the engaging protrusions.
[0006]
FIG. 1 shows a state in which one key is inserted into the keyhole, and therefore the unlocking notch 9 is angularly aligned with the locking bar 6.
[0007]
In this state, when a downward force is applied to the support shaft 12 using a switch member described later, the support shaft 12 rotates around the central axis c of the eccentric shaft 13 in the clockwise direction.
[0008]
As a result, the support shaft 12 loosely fits a support ball hole 28 of a tama-ball shape formed at one end of the tumbler A11A, so that the tumbler A remains in the position shown in FIG. Thus, only the tumbler B11B is lowered.
[0009]
As is clear from FIG. 2, the unlocking notch 9 and the locking bar 6 are aligned, so that the tumbler B11B can be lowered.
[0010]
Then, as shown in FIG. 2, the engagement note 18 of the tumbler A <b> 11 </ b> A is removed from the engagement recess 19.
[0011]
In this state, one key can be removed, so when one key is removed from the keyhole, the tumbler A11A rotates counterclockwise by its biasing force (not shown), but another new key is unlocked. By inserting, the tumbler A11A is rotated to a new angular position different from FIG.
[0012]
When the support shaft 12 is returned to the original position in this state, the tumbler B11B is also moved back to the position shown in FIG. 1, so that the manner of engagement between the tumbler A11A and the tumbler B11B is different from the previous one, and therefore the key difference is changed. It can be changed.
[0013]
[Problems to be solved by the invention]
However, the key difference conversion mechanism having the above-described structure is based on the premise that when the support shaft 12 rotates around the center of the eccentric shaft 13, the tumbler A11A does not change its position.
[0014]
However, in reality, the possibility that the tumbler A11A is driven by the tumbler B11B and changes its position due to the frictional engagement between the support shaft 12 and the support shaft hole 28 or the friction engagement with the tumbler B11B is completely denied. In this case, there is a grudge that the key-to-key conversion is not certain.
[0015]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a variable lever tumbler lock that solves the above-described inconveniences and that can be completely separated from the tumbler B11B because the tumbler A11A does not move when the support shaft 12 rotates. It is said.
[0016]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 is characterized in that each lever tumbler of the lever tumbler lock is a combination of tumbler A and tumbler B, which are polymerized in a substantially C shape. The shaft is supported so that it can rotate around the axis of an eccentric shaft protruding from both ends of the shaft, and the tumbler A having one end loosely fitted to the shaft is formed with an engaging portion with a key groove of a key, The unlocking notch is formed on the outer edge of the free end portion of the tumbler B that is urged in a direction that interferes with the key, and one end of the tumbler B is rotatably fitted to the support shaft. The portion overlapping with the engagement portion with the end edge is molded so as not to interfere with the key. On the other hand, the engagement protrusion is provided on the side opposite to the tumbler B on the inner end portion of the tumbler A, and the tumbler B is provided. Tumbler on an arc centered on the spindle at the inner edge of A plurality of engaging recesses that can be engaged with the engaging projections of the denters are formed, and the angle of formation of the engaging recesses is set in a plurality of types of key grooves with different depths formed at the side edge of the key. When the engaging portions of the inner cylinder are engaged with each other, they are set so as to be aligned with the engaging protrusions. On the other hand, the support shaft is urged outward, while the inner end of the inner cylinder is radially The switch member that can be moved to the outside and provided with a switch member that can be contacted from the outside of the support shaft is provided so that one end of the tumbler A is rotated inward, and the center axis of the support shaft is On the other hand, the partition plate facing the tumbler A is formed in a circular arc shape at the center, and a locking pin is provided so as to be close to one end of the tumbler A.
[0017]
The invention according to claim 2 is characterized in that the formation position of the locking pin is set between the center of the arc at one end of the tumbler A and the central axis of the inner cylinder.
[0018]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the structure of the conventional lever tumbler lock and the variable lever tumbler lock according to the previous application of the present application will also be described.
[0019]
As shown in FIGS. 3 and 4, the lever tumbler lock has an outer cylinder 2 in which a cam groove 1 is formed along a generatrix of the inner peripheral surface, and is rotatably fitted to the outer cylinder, and is centered through a gap. A plurality of partition plates 3 and 3 stacked in the axial direction are provided, an inner cylinder 5 penetrating the key hole 4 along the central axis, and extending along a generatrix of the inner cylinder 5, It has a locking bar 6 that is guided so as to be movable in the radial direction at the outer peripheral portion, and whose outer edge engaged with the cam groove 1 is urged in the outward projecting direction.
[0020]
Further, each slot 7 between the partition plates is substantially C-shaped as a whole and is pivotally supported at one end so as to be swingable, and is urged in a direction that interferes with the side edge of the key inserted into the key hole. At the same time, a lever tumbler 11 that is locked to a backup pin 8 that penetrates the inner cylinder in the axial direction and that has an unlocking notch 9 that receives the inner edge of the locking bar 6 at the outer edge of the free end is inserted. ing.
[0021]
When each of these tumbler groups is engaged with the corresponding keyway of the key inserted through the key hole, the unlocking notch 9 of each lever tumbler 11 is aligned with the inner edge of the locking bar 6 (not shown). ) Is configured as follows.
[0022]
Therefore, when the key is inserted into the key hole 4 and the inner cylinder 5 is relatively rotated in the outer cylinder 2, the inner cylinder of the locking bar 6 is caused by the wedge action generated between the cam groove 1 and the locking bar 6. In other words, the lever tumbler lock is unlocked and the inner cylinder 5 rotates in the unlocking direction.
[0023]
3 and 4, reference numeral 12 denotes a support shaft that passes through one end of the lever tumblers 11 and 11 in common and rotatably supports them.
[0024]
In contrast to the conventional lever tumbler lock configured as described above, the variable lever tumbler lock according to Japanese Patent Application No. 2001-379268 by the present applicant is characterized in that each of the lever tumblers 11 is not a single member, As shown in FIG. 1, it is divided into two members, a tumbler A11A and a tumbler B11B.
The tumbler A11A and the tumbler B11B are plate-like bodies each having an overall C-shape, and one end (the upper end in FIG. 1) is pivotally supported by the support shaft 12 in a state of overlapping each other. As described above.
[0026]
On the other hand, as shown in FIG. 5, eccentric shafts 13 and 13 (illustration of the eccentric shaft at the inner end is omitted) are provided at both ends of the support shaft 12, respectively. As shown in FIG. 6, these eccentric shafts 13 and 13 are rotatably supported by a key guide 14 and a tail guide 15, respectively.
[0027]
Since the eccentric shaft 13 and the support shaft 12 are eccentric, in other words, the support shaft 12 and the central axis c of the eccentric shaft 13 shown in FIG. When the upper end of the cross section is pushed in the direction of the arrow, the support shaft 12 rotates about the center axis c of the eccentric shaft.
[0028]
That is, the cross section of the support shaft 12 shown in FIG. 1 is a very short lever with the center axis c of the eccentric shaft as the rotation axis.
[0029]
In FIG. 1, the cross-sectional shape of the eccentric shaft 13 is not a perfect circle, but a part of the eccentric shaft 13 is scraped by the outer peripheral surface of the support shaft 12. This is because the distance from the center axis c of the eccentric shaft is increased, and is not an essential component of the present invention.
[0030]
If the angle at which the central axis c of the eccentric shaft looks at the outer peripheral surface of the eccentric shaft 13 is 180 degrees or more, the support shaft can be smoothly supported even if the eccentric shaft 13 is partially cut away. .
[0031]
On the other hand, as shown in FIG. 1, an engagement portion 16 that engages with a key groove (not shown) is formed at the center portion of the side edge facing the key hole 4 of the tumbler A, and a tumbler spring 17 ( It is biased in the direction of interfering with the key by the elasticity of FIG.
[0032]
The manner in which the tumbler spring 17 is attached to the tumbler A is the same as that of the conventional lever tumbler lock, and thus a more detailed description is omitted.
[0033]
On the other hand, the unlocking notch 9 is formed on the outer edge of the free end portion of the tumbler B11B, and the portion overlapping the engaging portion 16 of the tumbler A is formed so as not to interfere with the key. In short, it is cut out.
[0034]
Returning to the description of the tumbler A11A, a thin pin-like engagement protrusion 18 (see FIG. 1) is integrally formed on the inner edge of the free end facing the tumbler B11B.
[0035]
Correspondingly, on the inner edge of the free end of the tumbler B11B, as shown in FIG. 1, for example, on the arc centered on the support shaft 12, corresponding to the type of key groove depth of the key, for example Three engagement recesses 19, 19 are formed.
[0036]
In the illustrated embodiment, the engagement recess 19 is formed as a U-shaped notch that engages with the engagement protrusion 18.
[0037]
The angular position of each engagement recess 19 with respect to the support shaft 12 is such that the engagement portion 16 of the tumbler A11A is inserted into a plurality of types (three types in the illustrated embodiment) of key grooves formed on the side edge of the key. It is set so as to be aligned with the engaging protrusion 19 when engaged.
[0038]
For example, the leftmost engagement concave portion 19 in FIG. 1, that is, the engagement concave portion fitted to the engagement protrusion 18 of the tumbler A11A, is related to the formation angle position of the unlocking notch 9. It corresponds to one depth of the groove, and when the key groove of that depth and the engaging portion 16 of the tumbler A11A are engaged, the unlocking notch 9 and the inner edge of the locking bar 6 are aligned. The angular position is determined.
[0039]
Similarly, the angular position of the other engaging recess 19 of the tumbler B11B corresponds to the other depth of the keyway of the key combination.
[0040]
Therefore, when the tumblers A and B11A, 11B are in a positional relationship as shown in FIG. 1 and the engaging protrusion 18 is engaged with one of the engaging recesses 19, 19, the two are integrally connected to each other. It functions as a lever tumbler corresponding to one depth of the keyway.
[0041]
Returning to the description of the support shaft 12, as shown in FIGS. 6 and 8, the support shaft 12 is urged outward (upward in FIG. 8) by the elasticity of the support shaft spring 21 as a torsion coil spring, for example. As a result, a rotational moment about the eccentric shaft 13 is given.
[0042]
Further, in order to define a normal angle position where an external force other than the support shaft spring 21 does not act on the support shaft 12, as shown in FIG. 8, an inclined stop surface 22 is formed on the outer surface side of the tail plug 15, and the normal state. Then, the support shaft 12 is in elastic contact with the inclined stop surface 22 to define the angular position of the support shaft 12 with respect to the eccentric shaft 13.
[0043]
Note that this angular position in the illustrated embodiment is an angle position of 10:30 with respect to the eccentric shaft 13 in terms of a clock face.
[0044]
On the other hand, as shown in FIGS. 5 and 6, an inclined surface 25 is formed on the back side in a space defined by the rectangular recess 23 formed on the inner end surface of the outer cylinder 2 and the back plate 24. The block-shaped switch member 26 is guided and accommodated so as to be movable in the radial direction of the outer cylinder.
The inner end (the lower end in FIGS. 5 and 6) of the switch member 26 is in contact with the outer peripheral surface of the spacer ring 27 fitted to the inner end portion of the support shaft 12.
[0045]
In FIG. 1, reference numeral 28 denotes, for example, a ball-shaped support shaft hole opened at one end of the tumbler A11A, and reference numeral 29 denotes a relief notch formed at the outer edge of the free end portion of the tumbler A11A.
[0046]
As is apparent from FIG. 1, the relief notch is a notch formed in the tumbler A11A so as not to interfere with the locking bar 6 on the principle of operation of the lever tumbler lock. However, the width of the free end of the tumbler A11A is narrowed. However, if the material is appropriately set so as to ensure the strength, it is not necessary.
[0047]
On the other hand, as shown in FIG. 1 and FIG. 7, the locking pin 33 is provided close to one end of the tumbler A on the partition plate facing the tumbler A, in other words, on the partition plate 3 slidably in contact with the tumbler A11A. Projected.
[0048]
The position at which the locking pin is formed is preferably set between the center of the arc at one end of the tumbler A and the central axis of the inner cylinder.
[0049]
The locking pin 33 is not required to be so strong and may be small. For example, the locking pin 33 in the illustrated embodiment has a diameter of 0.8 mm (millimeter) and a height of about 0.5 mm.
[0050]
In order to project this locking pin on the partition plate, for example, a small hole may be made in the partition plate 3 and the locking pin may be driven into this, but in practice it is preferably formed by forging. .
[0051]
That is, a small hole is formed on the bottom of the shallow cup-shaped female mold to be filled with a portion to be a locking pin, and a material of a partition plate made of, for example, a zinc alloy is placed in this hole and hammered multiple times with a hammer. At the same time that the locking pin is projected, the keyhole part and other parts are formed.
[0052]
For the sake of clarity, the illustration of the locking pin 33 is omitted in drawings other than FIG.
[0053]
In the variable tumbler lock according to the embodiment of the present invention configured as described above, the locking bar 6 and the unlocking notch 9 are angularly aligned in the locked state shown in FIG. 7 or in a state where a different key is inserted. Not done.
[0054]
At this time, for example, if the different key is turned to rotate the inner cylinder, the locking bar 6 is displaced from the cam groove 1 due to the wedge action caused by the relative rotation of the inner cylinder with respect to the outer cylinder 2, that is, The locking bar 6 moves through the tumbler B11B and the support shaft 12 to move in the direction of the central axis of the inner cylinder, and the inclined stop surface of the tail plug 15 (usually also formed on the key guide 14). 22 (see FIG. 8), so that the inner cylinder cannot be rotated.
[0055]
On the other hand, when the key 30 is inserted into the keyhole, for example, as shown in FIG. 9, the unlocking notch 9 of the tumbler B11B and the inner edge of the locking bar 6 are angularly aligned. The inner cylinder can be turned in the same manner. That is, this variable tumbler lock is unlocked.
[0056]
In order to change the key difference of the variable tumbler lock according to the present invention, as shown in FIG. 9, first, the previous key is inserted into the key hole.
[0057]
Then, the key groove of the key is engaged with the engaging portion 16 of each tumbler 11, and as a result, the unlocking notches 9 and 9 of all the tumblers 11 and 11 are aligned with the inner edge of the locking bar 6.
[0058]
At this time, the conversion key 31 whose tip is formed into a conical shape, for example, is inserted into the inside of the pin hole 32 (see FIG. 6) of the back plate 24 without pulling out the key 30 thus far. To do.
[0059]
Then, the switch member 26 moves in the direction of the inner cylinder central axis by the wedge action generated between the inclined surface 25 of the switch member 26 and the tip of the conversion pin 31.
[0060]
The movement of the switch member 26 is transmitted to the support shaft 12 via the spacer ring 27. As a result, the support shaft 12 moves around the central axis of the eccentric shaft 13 as shown in FIG. The tumbler B11B is moved downward in FIG. 1 and FIG.
[0061]
At this time, as shown in FIG. 2, the tumbler A11A keeps its original position by the elasticity of the tumbler spring 17 (see FIG. 7), and the support shaft 12 moves freely in the support shaft hole 28 opened at one end of the tumbler A11A.
[0062]
That is, the tumbler B11B moves relatively downward in FIG. 10 independently of the tumbler A11A, and with this movement, the engaging protrusion 18 of the tumbler A11A is disengaged from the engaging recess 19 that has been engaged so far. To do.
[0063]
At this time, the tumbler A follows the tumbler B and moves downward in FIG. 2 due to the friction engagement between the support shaft 12 and the support shaft hole 28 and the friction engagement by sliding contact between the tumblers A and B. Even so, the movement is prevented by the locking pin (see FIG. 7), so that the tumblers A and B are reliably separated.
[0064]
Since the unlocking notch 9 of the tumbler B11B is angularly aligned with the inner edge of the locking bar 6 as described above, each tumbler B11B is engaged with the unlocking notch 9 and the inner edge of the locking bar 6. It is possible to move without interfering with the locking bar 6 while increasing the degree of.
[0065]
Next, as shown in FIG. 12, when the key 30 is pulled out with the conversion pin 31 inserted into the outer cylinder, the tumbler B11B is locked to the locking bar 6, and only the tumbler A11A has the elasticity of the tumbler spring. Is rotated counterclockwise and is eventually locked to the backup pin 8.
[0066]
At this time, since one end of the tumbler A11A is formed in an arc shape centering on the central axis of the support shaft, it does not interfere with the locking pin 33 during its rotation.
[0067]
Next, as shown in FIG. 13, with the conversion pin 31 inserted into the outer cylinder, a new key 300 different from the key 30 that was previously removed is inserted into the keyhole.
[0068]
Then, the engaging portion 16 (see FIG. 1) of each tumbler B11B engages with the corresponding key groove of the new key 300, and the engaging protrusion 18 faces the new engaging recess 19 so as to be engageable. It will be.
[0069]
In the illustrated embodiment, the engagement protrusion 18 that has been engaged with the leftmost engagement recess 19 until then (see FIG. 9) is the second engagement recess 19 from the left as shown in FIG. It will be able to engage with.
[0070]
When the conversion pin 31 is removed from the pin hole of the outer cylinder in this state, as shown in FIG. 14, the support shaft 12 moves upward by the elasticity of the support shaft spring 21 (see FIG. 8), and is driven by this. All the tumblers B11B move upward, and all the engaging protrusions 18 engage with the new engaging recess 19 corresponding to the new key 300.
[0071]
Thereafter, the conventional key 30 can no longer be used, and the lever tumbler lock can be locked and unlocked only by the new key 300. That is, the key difference is changed.
[0072]
If the above operation is repeated, the key difference can be changed any number of times as long as a new key can be prepared.
[0073]
In the illustrated embodiment, the switch member 26 is moved up and down by the conversion pin. However, for example, this can be configured such that the switch member is directly driven by fingers, and other drive members. A plurality of types of configurations can be considered.
[0074]
【The invention's effect】
As apparent from the above description, the present invention divides the lever tumbler into the tumbler A and the tumbler B, the tumbler A has an engaging protrusion, and the tumbler B has a plurality of keyholes corresponding to the depth of the keyway. Each of the engaging recesses is formed and moved in the radial direction using the pivot of the support shaft eccentric to the tumbler B, and the engaging recesses corresponding to the depth of the key groove of the new key inserted into the key hole Since the angle of the unlocking notch with respect to the support shaft is changed by changing the mode of engagement with the engaging protrusion, the expected effect is that the key difference can be changed any number of times with a simple operation. Play.
[0075]
In addition, one end of the tumbler A is formed in an arc shape centering on the central axis of the support shaft when it is turned inward, while the partition plate facing the tumbler A is close to one end of the tumbler A. Thus, since the locking pin protrudes, the tumbler A and the tumbler B can be reliably separated at the time of the key difference conversion operation without interfering with the operation of the tumbler A. .
[Brief description of the drawings]
FIG. 1 is an enlarged front view for explaining the structure of a tumbler of a variable lever tumbler lock, showing a state in which tumblers A and B are connected to each other.
FIG. 2 is an enlarged front view for explaining the structure of a tumbler similar to that in FIG. 1, showing a state where tumblers A and B are separated for key difference conversion.
FIG. 3 is a longitudinal sectional view showing an example of a conventional lever tumbler lock.
FIG. 4 is a cross-sectional view thereof.
FIG. 5 is an enlarged external perspective view showing a driving mechanism of a support shaft by a switch member, and shows a normal state.
FIG. 6 is an enlarged longitudinal sectional view of a lever tumbler lock according to one embodiment of the present invention.
FIG. 7 is an enlarged cross-sectional view seen from the outside.
FIG. 8 is an enlarged front view of the tail plug as seen from the outside.
FIG. 9 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows one key difference corresponding to one key.
FIG. 10 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows a state in which the tumblers A and B are separated by driving the hook switch member in which one key is inserted into the key hole. Show.
11 is an enlarged external perspective view showing a driving mechanism of a support shaft by a switch member similar to FIG. 5, and shows a state in which the switch member is driven by a conversion pin.
FIG. 12 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, in which the switch member is driven to separate the tumblers A and B and then the one key is removed from the keyhole. Show.
FIG. 13 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention. After separating the tumblers A and B by driving the switch member, one key is removed from the key hole, The state in which the key is inserted into the keyhole is shown.
FIG. 14 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows a state where a new key difference is fixed by inserting the other key into the key hole and then returning the switch member to the original position. Show.
[Explanation of symbols]
1 Cam groove 2 Outer cylinder 4 Key hole 5 Inner cylinder 6 Locking bar 8 Backup pin 9 Unlock notch 11 Lever tumbler 11A Tumbler A
11B Tumbler B
12 Support shaft 13 Eccentric shaft 14 Key guide 15 Tail plug 16 Engagement portion 17 Tumbler spring 18 Engagement protrusion 19 Engagement recess 21 Support shaft spring 22 Inclination stop surface 25 Inclination surface 26 Switch member 30 Key 31 Conversion pin 33 Locking pin

Claims (2)

Each lever tumbler of the lever tumbler lock is a combination of tumbler A and tumbler B, which overlap each other in a substantially C shape, while rotating around the axis of the eccentric shaft protruding from both ends of the support shaft The tumbler A, which is supported so that one end thereof is loosely fitted to the support shaft, is formed with an engaging portion with the key groove of the key, and is biased in a direction that interferes with the key, and one end is supported. An unlocking notch is formed on the outer edge of the free end portion of the tumbler B that is pivotally fitted to the shaft, and the portion that overlaps with the engaging portion of the tumbler A with the key-end side edge does not interfere with the key. On the other hand, an engagement protrusion is formed on the side of the tumbler A facing the tumbler B on the inner edge of the free end, and the tumbler A is formed on the inner edge of the tumbler B on an arc centering on the support shaft. A plurality of engaging recesses that can be engaged with the engaging protrusions At the same time, when the engaging portion of the tumbler A is engaged with a plurality of types of key grooves formed at the side edge of the key combination, the forming angular position of the engaging recess is aligned with the engaging protrusion. On the other hand, on the other hand, the support shaft is urged outward. On the other hand, a switch member that is movable in the radial direction of the inner cylinder and can be operated from the outside is provided on the inner end of the inner cylinder from the outside of the support shaft. The one end portion of the tumbler A is formed in an arc shape centering on the central axis of the support shaft when it is turned inward, and the partition plate facing the tumbler A is A variable lever tumbler lock, characterized in that a locking pin protrudes so as to be close to one end of the tumbler A. The variable lever tumbler lock according to claim 1, wherein a position where the locking pin is formed is set between the center of the arc of one end of the tumbler A and the central axis of the inner cylinder.

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