TWM567289U - Lock assembly - Google Patents

Abstract

The present invention discloses a lock assembly comprising: an inner lock member, an outer lock member and a buckle, the inner lock member having an abutting top portion, a connecting portion, a first receiving portion and a top cap; the connecting portion The utility model comprises a concave space, a first spring and a fork pin; the outer locking member is used for accommodating the inner locking member, the outer locking member has a second receiving portion and a sleeve portion; the second receiving portion comprises two a through hole, two balls, a second spring, a C-shaped protrusion and a card slot; the buckle is removably sleeved on the first receiving portion and located between the top cap and the sleeve portion; When the buckle is removed and the inner locking member is in a locked position, the fork pin is snapped into the card slot, and when the inner locking member is in an unlocked position, the fork pin is disengaged from the card slot. In this way, the lock assembly proposed by the present invention can be locked without a key, so that it is not necessary to copy a large number of identical keys to the staff, which can effectively reduce the cost and reduce the risk of loss or outflow of the key. In addition, the buckle system prevents the worker from accidentally pressing the inner lock member to directly lock the outer lock member before the installation of the new gas meter has been completed.

Description

Lock assembly

The present invention relates to a lock assembly, and more particularly to a lock assembly that can be locked without a key.

FIG. 1 is a schematic view of a gas table lock frame 90. In order to prevent the values recorded by the gas meter from being arbitrarily falsified, the gas table lock frame 90 shown in Fig. 1 is often used to lock the gas table with the conventional lock.

In the conventional lock structure design, the key must be used in the process of locking or unlocking the gas table lock frame 90. In order to save costs, gas companies usually match the same locks for a large number of users' gas meters without individually making different locks for them.

However, in general, unless the gas meter fails, the gas company staff does not need to unlock the gas meter lock frame 90, so the worker usually only needs to install the gas meter lock frame 90 when installing a new gas meter for the user. Locked. However, the staff still has to use the key to carry out the locking of the gas meter lock 90, that is, the gas company still needs to copy a large number of the same key to different staff so that they can install the gas meter for the user. Lock it.

This way of copying a large number of identical keys not only increases the cost, but also increases the risk of loss or outflow of the key. In view of this, how to create a lock component that can be locked without a key, in order to effectively solve the aforementioned problems, will be actively exposed by the creative.

One of the aims of the present invention is to provide a lock assembly that can be locked without a key, which can effectively solve the problems caused by copying a large number of identical keys in the prior art.

In order to achieve the above and other objects, the present invention provides a lock assembly comprising: an inner lock member having an abutting top portion, a connecting portion, a first receiving portion and a top cap, the connecting portion being interposed therebetween Between the top portion and the first receiving portion, the top cap is connected to the first receiving portion, and the abutting top has a tapered tip, the connecting portion comprises: a concave space; a first spring is disposed on the first spring a recessed space in the bottom of the recessed space; and a fork pin disposed on the first spring; an outer lock member for accommodating the inner lock member, the outer lock member having a first a second receiving portion and a sleeve portion, the second receiving portion comprises: two buckle through holes; two balls disposed in the second receiving portion and adjacent to the two buckle through holes; a second spring a C-shaped protrusion disposed along a circumferential direction of the second receiving portion and protruding inwardly from an inner side wall of the second receiving portion; and a card slot along the a circumferential direction of the second receiving portion is disposed in the second receiving portion and adjacent to the C-shaped protrusion; and a buckle, the removable sleeve The first receiving portion is located between the top cap and the sleeve portion; wherein when the buckle is removed and the inner locking member is in a locked position, the fork pin is buckled in the card slot, When the inner locking member is in an unlocked position, the fork pin is disengaged from the card slot.

In an embodiment of the present invention, the first accommodating portion further includes: an opening slot disposed parallel to an insertion direction of the inner locking member; and a plurality of locking plates rotatably disposed in the first accommodating portion; And a locking rod disposed on a circumference of the locking disc and corresponding to the opening slot; wherein the top cap restricts the locking discs in the first receiving portion.

In an embodiment of the present invention, the sleeve portion further includes: an inner groove parallel to the insertion direction and located at an inner side wall of the sleeve portion; wherein the inner locking member is located in the locking position, the inner portion The groove corresponds to the position of the open slot.

In an embodiment of the present invention, the projection of the inner groove and the projection of the notch of the C-shaped protrusion correspond to different positions on the circumference of the outer lock member on a projection surface perpendicular to the insertion direction.

In an embodiment of the present invention, the lock discs each have a specific shape such that when the inner lock member is in the locked position, the lock lever portion protrudes outwardly from the open slot.

In one embodiment of the present invention, the lock pins are inserted into the lock disks via a key, and the lock bars are received in the open slots, and when the fork pins are aligned with the C shape When the notch is notched, the inner locking member is pushed out by the second spring in a direction opposite to the insertion direction.

In an embodiment of the present invention, the second receiving portion further includes: a permanent hole; and a positioning screw inserted into the through hole and protruding inwardly from an inner side wall of the second receiving portion; the connecting portion The utility model further comprises: a positioning slot for receiving the positioning screw.

In an embodiment of the present invention, the abutting top passes through the second spring and the second spring abuts the connecting portion.

In an embodiment of the present invention, the buckle includes a protrusion.

In an embodiment of the present invention, the outer lock member further includes a ring, and the loop is sleeved on the outer surface of the second receiving portion.

In an embodiment of the present invention, the top cap further includes a positioning mark located in a region where the top surface of the top cap is not covered by the cover pad.

Therefore, since the lock component proposed by the present invention can be locked without a key, the key needs to be used only in a few specific cases (for example, a gas meter failure), so that it is not necessary to copy a large number of the same key to the staff. Can effectively reduce costs and reduce the risk of loss or outflow of keys. In addition, the buckle of the lock assembly prevents the worker from accidentally pressing the inner lock member to directly lock the outer lock member before the installation of the new gas meter is completed.

In order to fully understand the creation, a detailed description of the creation will be made by the following specific examples and with the accompanying drawings. Those skilled in the art can understand the purpose, features and effects of the present disclosure by the contents disclosed in the present specification. It should be noted that the present invention may be implemented or applied by other different embodiments. The details of the present specification may also be based on different viewpoints and applications, and various modifications and changes may be made without departing from the spirit of the present invention. In addition, the drawings attached to the present invention are merely illustrative and not drawn to actual dimensions. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the technical scope of the present invention. The description is as follows:

2 is an exploded perspective view of the lock assembly 1 of an embodiment of the present invention. As shown in FIG. 2, the lock assembly 1 includes an inner lock member 10, an outer lock member 20, and a buckle ring 30. The inner locking member 10 has an abutting top portion 11 , a connecting portion 13 , a first receiving portion 15 and a top cap 17 . The connecting portion 13 is between the abutting top portion 11 and the first receiving portion 15 . The top cap 17 is connected to the first receiving portion 15 and has a tapered tip 111.

In the embodiment, the connecting portion 13 includes a concave space 131, a first spring 133 and a fork pin 135. The first spring 133 is disposed in the recessed space 131 and abuts against the bottom of the recessed space 131. The fork pin 135 is disposed on the first spring 133. The fork pin 135 is designed to partially protrude beyond the recessed space 131, but does not deviate from the recessed space 131.

The outer locking member 20 is used for accommodating the inner locking member 10, and the inner locking member 10 and the outer locking member 20 cooperate to achieve the purpose of locking.

The outer lock member 20 has a second receiving portion 21 and a sleeve portion 23. In this embodiment, the second receiving portion 21 includes two through-holes 211, two balls 213, a second spring 215, a C-shaped protrusion 217 (see FIGS. 3B and 5 in the rear), and a card slot 219. (See Figure 3B below). The two balls 213 are disposed in the second receiving portion 21 and adjacent to the two through-holes 211. The second spring 215 is disposed in the second receiving portion 21 along the C-shaped protrusion 217. The second accommodating portion 21 is disposed in the circumferential direction and protrudes inwardly from the inner side wall of the second accommodating portion 21, and the card slot 219 is disposed in the second accommodating portion along the circumferential direction of the second accommodating portion 21. The inside of 21 is adjacent to the C-shaped protrusion 217. The two balls 213 are designed to protrude from the second receiving portion 21, and the outer diameter of the two through holes 211 is smaller than the diameter of the two balls 213, so that the two balls 213 are not separated. The second housing portion 21.

The buckle 30 is removably sleeved on the first receiving portion 15 and located between the top cap 17 and the sleeve portion 23 . The buckle 30 is used to prevent the worker from accidentally pressing the inner lock member 10 to directly lock the outer lock member 20 before the installation of the new gas meter is completed.

The lock assembly 1 of the present embodiment can be used to lock or unlock the gas meter in conjunction with the gas table lock frame 90 of Fig. 1, and the key is required only when unlocking. A more detailed explanation will be given below.

3A and 3B are partial cross-sectional views showing the lock assembly 1 from different angles when the inner lock member 10 is in a locked position. 4 is a partial cross-sectional view of the lock assembly 1 when the inner lock member 10 is in an unlocked position. FIG. 5 is a schematic view showing the projection of the outer lock member 20 on a projection surface perpendicular to the insertion direction (Z direction) of the inner lock member 10.

As shown in FIG. 3B, when the buckle 30 is removed and the inner locking member 10 is in a locked position, the fork pin 135 is snapped into the card slot 219 by the thrust of the first spring 133. The abutting top 11 passes through the second spring 215, and the second spring 215 abuts the connecting portion 13. As shown in FIG. 3A, at this time, the second spring 215 is compressed, so that the top 11 of the inner locking member 10 is outwardly abutted against the two balls 213, so that the two balls 213 partially protrude from the second volume. The offset portion 211 of the portion 21 is outside. The two balls 213 partially protruding from the second receiving portion 21 can lock the gas table with the gas table lock frame 90 of FIG.

As shown in FIG. 2, the first receiving portion 15 of the present embodiment further includes an opening slot 151, a plurality of locking discs 153, and a locking lever 155. The open groove 151 can be disposed in parallel to the insertion direction (Z direction) of the inner lock member 10. The lock disk 153 is rotatably disposed in the first accommodating portion 15 . The lock lever 155 is disposed on a circumference of the lock disk 153 and corresponds to the opening groove 151 .

In addition, the top cap 17 limits the lock discs 153 in the first receiving portion 15 . The top cap 17 has an opening 171 that allows a key (not shown) that conforms to the particular shape of the lock disc 153 to be inserted therein to rotate the lock disc 153. In an embodiment, the top cap 17 includes a cover 173, such as a soft rubber pad, that covers the opening 171 to prevent dust from entering the lock disk 153 via the opening 171. The cover pad 173 has a cross-shaped slot 175 into which a key conforming to the particular shape of the lock disk 153 can be inserted without being blocked by the cover pad 173.

Referring to FIG. 2 and FIG. 5 simultaneously, in an embodiment, the sleeve portion 23 of the outer lock member 20 further includes an inner groove 231. The inner groove 231 is disposed parallel to the insertion direction (Z direction) and is located at an inner side wall of the sleeve portion 23.

When the inner lock member 10 is in the locked position as shown in FIGS. 3A and 3B, the inner groove 231 is in a position corresponding to the opening groove 151. Further, as shown in FIG. 2, since the lock disks 153 each have a specific shape, the lock lever 155 can partially protrude outward from the open groove 151 when the inner lock member 10 is in the locked position. That is, when the inner lock member 10 is in the locked position, the lock lever 155 can partially protrude outward and be accommodated in the inner groove 231, since the lock lever 155 is restricted by the inner groove 231, The inner lock member 10 cannot be rotated relative to the outer lock member 20.

As shown in FIG. 5, the projection of the inner groove 231 and the projection of the notch 217a of the C-shaped protrusion 217 correspond to the circumference of the outer lock member 20 on a projection surface (XY plane) perpendicular to the insertion direction. s position. For example, in the embodiment shown in FIG. 5, the notch 217a of the C-shaped protrusion 217 corresponds to the position of the arc of the outer lock member 20 on the circumference (X-axis), and the inner groove 231 corresponds to On the circumference of the outer lock member 20, a position of π/2 (Y axis). However, the present invention is not limited thereto, and the projection of the inner groove 231 and the projection of the notch 217 of the C-shaped protrusion 217 correspond to the position on the circumference of the outer lock member 20 as long as the inner groove 231 is adjusted. The projection of the notch 217a of the C-shaped protrusion 217 corresponds to a different position on the circumference of the outer lock member 20, and is applicable to the lock assembly 1 of the present invention.

When the inner lock member 10 is to be switched from the locked position to the unlocked position, a key (not shown) can be inserted into the lock disk 153 and the lock disk 153 can be rotated, for example, as shown in FIG. The direction D is rotated clockwise. At this time, since the lock disks 153 respectively have a specific shape, after the lock disks 153 are rotated via the key, the lock lever 155 can be received in the open slot 151, that is, via the key. The rotation can release the restriction of the inner groove 231 on the locking rod 155, so that the inner locking member 10 can rotate relative to the outer locking member 20.

As shown in FIGS. 4 and 5, when the inner locking member 10 is rotated until its fork pin 135 is aligned with the notch 217a of the C-shaped projection 217 (that is, the fork pin 135 is parallel to the insertion direction and When the notch 217a of the C-shaped protrusion 217 is in a straight line, the inner locking member 10 can be pushed out by the second spring 215 in a direction opposite to the insertion direction by the restoring force of the second spring 215. At the same time, the fork pin 135 which is originally snapped into the slot 219 is also pushed out by the restoring force of the second spring 215 through the notch 217a of the C-shaped protrusion 217, thereby disengaging the fork pin 135 from the card. Slot 219.

Similarly, as shown in FIG. 4, the abutting top portion 11 is also pushed out by the second spring 215 in a direction opposite to the insertion direction, so that the portion of the first abutting portion 11 that is originally outwardly abutted against the two balls 213 is The tapered tip 111 is replaced, so that the two balls 213 are given enough space to move in the through hole 211 of the second receiving portion 21, that is, the gas table lock frame 90 of FIG. 1 can be locked. The gas table is unlocked. That is, when the inner locking member 10 is in the unlocked position as shown in FIG. 4, the fork pin 135 is disengaged from the slot 219, and the second spring 215 is pushed out in the direction opposite to the insertion direction. 11. The two balls 213 are movable in the through hole 211 of the second receiving portion 21 without being abutted.

In the present embodiment, due to the design of the lock disk 153, the key can be inserted or removed only when the opening groove 151 of the inner lock member 10 corresponds to the position of the inner groove 231 of the outer lock member 20. Out. For example, when the lock assembly 1 is unlocked via the foregoing steps, the key must be rotated in a counterclockwise direction opposite to the direction D shown in FIG. 5 to drive the lock member 153 and the inner lock member 10 is driven. Rotate. At this time, the lock lever 155 can protrude outward from the opening groove 151 via the pushing portion of the lock disk 153. When the opening groove 151 of the inner locking member 10 again corresponds to the position of the inner groove 231 of the sleeve portion 23, that is, when the locking lever 155 partially protrudes outwardly and is received in the inner groove 231 , the key can be pulled out.

When the inner locking member 10 is to be returned to the locking position, the inner locking member 10 only needs to be pushed into the outer locking member 20 along the insertion direction, so that the inner locking member 10 can be returned to the figure. 3A, the locking position shown in Figure 3B. This is because when the inner lock member 10 is pushed into the outer lock member 20 along the insertion direction, the fork pin 135 passes through the C-shaped protrusion 217, and at this time, the fork pin 135 is abutted by the C-shaped protrusion 217. Pushing and compressing the first spring 133 toward the inside of the concave space 131; after the fork pin 135 completely passes the C-shaped protrusion 217, the card slot 219 is reached, and at this time, the fork pin 135 passes through the first A spring 133 is snapped into the card slot 219 against the thrust outside the recessed space 131. That is, by pushing the inner locking member 10 into the outer lock member 20 in the insertion direction, the lock assembly 1 can be brought into a locked state as shown in Figs. 3A and 3B without using a key.

As shown in FIG. 2, in the present embodiment, the second receiving portion 21 of the outer locking member 20 further includes a matching hole 212 and a positioning screw 214. The positioning screw 214 is inserted into the through hole 212 and is inward. The inner side wall of the second receiving portion 21 protrudes. In addition, the connecting portion 13 of the inner locking member 10 further includes a positioning slot 137 for receiving the positioning screw 214.

Through the matching of the positioning slot 137 and the positioning screw 214, the range of movement of the inner locking member 10 along the insertion direction can be limited, and the range of rotation of the inner locking member 10 along the circumferential direction of the outer locking member 20 can also be restricted. . For example, when the inner locking member 10 is pushed out by the second spring 215 in the direction opposite to the insertion direction by the restoring force of the second spring 215 as shown in FIG. 4, the positioning screw 214 will abut. One of the inner side walls of the positioning groove 137 ensures that the inner locking member 10 does not completely come out of the outer locking member 20. When the lock disk 153 is rotated in a clockwise direction in the direction D shown in FIG. 5 by a key inserted into the lock disk 153 and the entire lock member 10 is rotated, the set screw 214 is abutted. The other inner side wall of the positioning groove 137 ensures that the inner locking member 10 can only be rotated at most until its fork pin 135 is in line with the notch 217a of the C-shaped projection 217 in parallel with the insertion direction.

It should be noted that when the buckle 30 is still sleeved on the first receiving portion 15, the inner locking member 10 cannot reach the locking position, because the buckle 30 can block the inner locking member 10 along The insertion direction is completely pushed into the outer lock member 20, thereby effectively preventing the worker from accidentally pressing the inner lock member 10 directly locked with the outer lock member 20 before the installation of the new gas meter is completed. .

This creation does not limit the shape of the buckle shown in Figure 2. FIG. 6 is a schematic view of the buckle 31 of another embodiment of the present invention. Similar to the buckle 30 shown in FIG. 2, the buckle 31 is designed to be removably sleeved between the first receiving portion 15 and between the top cap 17 and the sleeve portion 23. In the embodiment shown in FIG. 6, the buckle 31 includes a protrusion 311, which makes it easier for a worker to remove the buckle 31 from the first receiving portion 15 by hand or through a tool. .

Figure 7 is a schematic illustration of the lock member 20 in accordance with an embodiment of the present invention. In this embodiment, the outer lock member 20 can further include a sleeve 25 that is sleeved on the outer surface of the second receiving portion 21 of the outer lock member 20. For example, the collar 25 can be made of an elastic material. When there is a tolerance between the lock 20 or the lock to be locked (the gas table), the collar 25 can be used to fill both The gap between the two further avoids the problem that the lock assembly 1 is easily shaken.

FIG. 8 is a schematic view of the top cap 17 of an embodiment of the present invention. In the present embodiment, the top cap 17 further includes a positioning mark 177 located in a region where the top surface of the top cap 17 is not covered by the cover pad 173. The positioning mark 177 can be, for example, a pointing point or a cross symbol having a different color from the top cap 17, which is used to indicate the position where the worker key is correctly inserted, and avoids the staff member because the cover pad 173 covers the opening 171. The key must be rotated continuously to find the correct insertion position.

According to the above, the lock component 1 proposed by the present invention can be locked by using a key, and the key needs to be used only when unlocking, so that it is not necessary to copy a large number of the same key to the staff, which can effectively reduce the cost and reduce the loss of the key. Or the risk of outflow. In addition, the buckle 30 of the lock assembly 1 prevents the worker from accidentally pressing the inner lock member 10 to directly lock the outer lock member 20 before the installation of the new gas meter is completed.

It should be particularly noted that although the above description is directed to locking or unlocking the gas meter in conjunction with the gas meter lock frame 90 of FIG. 1, the lock assembly 1 of the present creative embodiment can also be applied to, for example, water meters, electric meters, and the like. The parts are locked and unlocked.

The present invention has been disclosed in the above embodiments, and it should be understood by those skilled in the art that this embodiment is only used to depict the present invention and should not be construed as limiting the scope of the present invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of this creation is subject to the definition of the scope of patent application.

1‧‧‧Lock assembly
10‧‧‧Interlocking parts
11‧‧‧ arrive at the top
111‧‧‧Conical tip
13‧‧‧Connecting Department
131‧‧‧ recessed space
133‧‧‧First spring
135‧‧‧ fork pin
137‧‧‧ positioning slot
15‧‧‧First Housing Department
151‧‧‧Open slot
153‧‧‧Lock disk
155‧‧‧Lock lever
17‧‧‧Top cap
171‧‧‧ openings
173‧‧‧ Cover pad
175‧‧‧Cross-type slotting
177‧‧‧ Positioning Sign
20‧‧‧Outside locks
21‧‧‧Second Accommodation
211‧‧‧Deductible through hole
212‧‧‧through holes
213‧‧‧ balls
214‧‧‧Locating screws
215‧‧‧Second spring
217‧‧‧C-shaped protrusion
217a‧‧‧C-shaped protrusion gap
219‧‧‧ card slot
23‧‧‧Sleeve Department
231‧‧‧ Inside trench
25‧‧‧ collar
30, 31‧‧‧ buckle
311‧‧‧Protruding
90‧‧‧ gas table lock
X, Y, Z‧‧‧ coordinate axis

[Fig. 1] is a schematic view of a gas table lock frame. FIG. 2 is an exploded perspective view of the lock assembly of the present embodiment. 3A and 3B are partial cross-sectional views of the lock assembly taken from different angles when the inner lock member is in a locked position. [Fig. 4] is a partial cross-sectional view of the lock assembly when the inner lock member is in an unlocked position. [Fig. 5] is a schematic view showing the projection of the outer lock member on a projection surface perpendicular to an insertion direction of the inner lock member. Fig. 6 is a schematic view showing a buckle of another embodiment of the present invention. Fig. 7 is a schematic view showing a lock member in addition to an embodiment of the present invention. Fig. 8 is a schematic view showing the top cap of an embodiment of the present invention.

Claims (11)

A lock assembly includes: an inner lock member having an abutting top portion, a connecting portion, a first receiving portion and a top cap portion, the connecting portion being interposed between the abutting top portion and the first receiving portion The top cap is connected to the first receiving portion, and the abutting top has a tapered tip. The connecting portion comprises: a concave space; a first spring disposed in the concave space and facing the concave portion a bottom portion of the space; and a fork pin disposed on the first spring; an outer lock member for receiving the inner lock member, the outer lock member having a second receiving portion and a sleeve portion, the first The second receiving portion includes: two buckle through holes; two balls disposed in the second receiving portion and adjacent to the two through through holes; a second spring disposed in the second receiving portion; a protrusion protruding along a circumferential direction of the second receiving portion and protruding inwardly to an inner side wall of the second receiving portion; and a card slot disposed along the circumferential direction of the second receiving portion The second receiving portion is adjacent to the C-shaped protrusion; and a buckle is removably sleeved on the first receiving portion and located at the top cap Between the sleeve portion and the sleeve portion; wherein when the buckle is removed and the inner lock member is in a locked position, the fork pin is buckled in the card slot, and when the inner lock member is in an unlocked position, The fork pin is disengaged from the card slot. The lock assembly of claim 1, wherein the first receiving portion further comprises: an opening slot disposed parallel to an insertion direction of the inner locking member; and a plurality of locking discs rotatably disposed on the first receiving portion And a locking rod disposed on a periphery of the locking disc and corresponding to the opening slot; wherein the top cap restricts the locking discs in the first receiving portion. The lock assembly of claim 2, wherein the sleeve portion further comprises: an inner groove parallel to the insertion direction and located at an inner side wall of the sleeve portion; wherein when the inner lock member is in the locked position, The inner groove corresponds to the position of the open slot. The lock assembly of claim 3, wherein the projection of the inner groove and the projection of the notch of the C-shaped protrusion correspond to different positions on the circumference of the outer lock member on a projection surface perpendicular to the insertion direction . The lock assembly of claim 2, wherein the lock discs each have a particular shape such that the lock lever portion projects outwardly from the open slot when the inner lock member is in the locked position. The lock assembly of claim 5, wherein the lock lock is inserted into the lock disk via a key, and the lock lever is received in the open slot, and when the fork pin is aligned When the C-shaped projection is notched, the inner lock member is pushed out by the second spring in a direction opposite to the insertion direction. The lock assembly of claim 1, wherein the second receiving portion further comprises: a consistent hole; and a positioning screw inserted into the through hole and protruding inwardly from an inner side wall of the second receiving portion; The connecting portion further includes: a positioning slot for receiving the positioning screw. The lock assembly of claim 1, wherein the abutting top passes through the second spring and the second spring abuts the connecting portion. The lock assembly of claim 1, wherein the buckle comprises a projection. The lock assembly of claim 1, wherein the outer lock member further comprises a set of rings, and the collar is sleeved on an outer surface of the second receiving portion. The lock assembly of claim 1, wherein the top cap further comprises a positioning mark located in an area of the top surface of the top cap that is not covered by the cover pad.