TWI852778B - Composite component tray - Google Patents

Abstract

A composite component tray is used to carry various stages of semi-finished products that are sequentially completed in several stages of an assembly process. The composite component tray includes a base, a carrier plate and an accommodating component. The carrier plate is located on one side of the base. The accommodating component is located on the carrier plate and includes a first groove and a first inner step. The first inner step protrudes from the inner wall of the first groove, and divides the first groove into a first upper layer area and a first lower layer area. The first lower zone is used to place one stage of semi-finished products, and the first inner step is used to support another stage of semi-finished products located in the first upper zone.

Description

Composite material tray

The present invention relates to a material pallet, in particular to a composite material pallet.

Generally speaking, the automation process is divided into three main sections: pre-testing, assembly and post-testing. Semi-finished products in each stage are tested and assembled according to the needs.

However, the semi-finished products at the above stages need to be provided with trays (or jigs) of corresponding shapes or sizes during testing and assembly, and the trays used by the semi-finished products at the above stages cannot be shared. Therefore, not only do they need to be transported multiple times, which consumes more manufacturing costs, but the variety of trays is also complicated and difficult to manage.

One purpose of the present invention is to provide a composite material tray to solve the difficulties mentioned in the above-mentioned prior art.

The present invention provides a composite material tray. The composite material tray is used to carry a plurality of semi-finished products of various stages that are completed sequentially in several stages of an assembly process. The composite material tray comprises a base, a carrier plate and a receiving assembly. The carrier plate is located on one side of the base. The receiving assembly is located on the carrier plate and comprises a first groove and at least one first inner step. The first inner step is protruding from the inner wall of the first groove and divides the first groove into a first upper layer area and a first lower layer area. The first lower layer area is used to place a semi-finished product of one stage, and the first inner step is used to support a semi-finished product of another stage located in the first upper layer area.

According to one or more embodiments of the present invention, in the composite material tray, the accommodating assembly further comprises a second groove and at least one second inner step. The second groove is adjacent to the first groove, and the second inner step is protruding from the inner wall of the second groove and divides the second groove into a second upper layer area and a second lower layer area. The second inner step is used to support another stage semi-finished product located in the second upper layer area.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the accommodating assembly further includes a first base and two first corner frames separated from each other and two side frames separated from each other. The first base is stacked on the carrier plate for placing a semi-finished product of one stage flat. These first corner frames are respectively fixed on one side of the first base facing away from the carrier plate, and each first corner frame has a first inner corner portion. These side frames are respectively fixed on one side of the carrier plate facing away from the base, and each side frame has a second inner corner portion and a third inner corner portion adjacent to each other. The first base, these first corner frames and these side frames jointly define the above-mentioned first groove. The first inner step includes a plurality of first inner steps, and these first inner steps are respectively arranged on these first inner corner portions and these second inner corner portions. The supporting plane formed by the first inner steps being aligned with each other is located between the first upper layer area and the first lower layer area.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the accommodating assembly further includes a second base and two second corner frames separated from each other. The second base is stacked on the carrier and is adjacent to the first base. These second corner frames are fixed on one side of the carrier facing away from the base, and each second corner frame has a fourth inner corner. The second base, these second corner frames and these side frames jointly define a second groove. The second inner step includes a plurality of second inner steps, and these second inner steps are respectively arranged on these third inner corners and these fourth inner corners. The bearing plane formed by these second inner steps being aligned with each other is between the second upper area and the second lower area.

According to one or more embodiments of the present invention, in the composite material tray, one side of the first base has two opposite first indentations. Each second inner corner has a first flange. The first flange is protruding from the inner wall of the corresponding second inner corner facing the first groove, and these first flanges extend into these first indentations in a matching manner, so that the first flange and the first base together form the bottom of the first groove.

According to one or more embodiments of the present invention, in the composite material tray, the second base has two opposite second retracted portions and two opposite third retracted portions. Each third inner corner has a second flange, and each fourth inner corner has a third flange. These second flanges and these third flanges extend into these second retracted portions and these third retracted portions in a matching manner, so that the second flanges, the third flanges and the second base together form the bottom of the second groove.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the second base further has a protrusion, and the protrusion is protruding from a surface of the second base facing the second groove.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the first base has a recessed portion and a through-hole, the recessed portion is formed on one surface of the first base facing the first groove, and the through-hole is formed on the bottom surface of the recessed portion.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the accommodating component includes a rectangular frame containing a first groove and a second groove.

According to one or more embodiments of the present invention, in the above-mentioned composite material tray, the base has at least one opening portion, and the opening portion penetrates the base.

Thus, through the structures of the above embodiments, the composite material tray of the present invention can carry the semi-finished products completed in sequence in each stage of the assembly process, which greatly simplifies the number of types of trays and does not consume more manufacturing costs.

The above description is only used to explain the problem to be solved by the present invention, the technical means for solving the problem, and the effects produced, etc. The specific details of the present invention will be introduced in detail in the following implementation method and related drawings.

The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in each embodiment of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some commonly used structures and components will be depicted in the drawings in a simple schematic manner.

FIG. 1 is a schematic diagram of a composite material tray 10 of an embodiment of the present invention. FIG. 2 is an exploded view of the composite material tray 10 of FIG. 1. FIG. 3 is a cross-sectional view along line segment AA of FIG. 1. As shown in FIG. 1 to FIG. 3, the composite material tray 10 includes a base 100, a carrier plate 200 and a receiving assembly 300. The carrier plate 200 is overlapped on the base 100, and the receiving assembly 300 is located on the carrier plate 200, so that the carrier plate 200 is sandwiched between the base 100 and the receiving assembly 300. In this embodiment, more specifically, the base 100 has a supporting surface 110 and a bottom surface 120 facing each other, the carrier 200 has a first surface 210 and a second surface 220 facing each other, the second surface 220 of the carrier 200 faces and contacts the supporting surface 110 of the base 100, and the accommodating assembly 300 is located on the first surface 210 of the carrier 200. The accommodating assembly 300 includes a first groove 500, a second groove 600, a plurality of first inner steps 510, and a plurality of second inner steps 610. The first groove 500 and the second groove 600 are adjacent to each other. These first inner steps 510 are spaced apart from each other and are respectively convexly disposed on the inner wall of the first groove 500, and divide the first groove 500 into a first upper layer area U1 and a first lower layer area L1 (FIG. 3), and the area range of the first upper layer area U1 is larger than the area range of the first lower layer area L1. These second inner steps 610 are spaced apart from each other and are convexly disposed on the inner wall of the second groove 600, and divide the second groove 600 into a second upper layer area U2 and a second lower layer area L2 (FIG. 3), and the area range of the second upper layer area U2 is larger than the area range of the second lower layer area L2.

Thus, the bottom of the first groove 500 is used to place a specific stage semi-finished product (not shown in the figure) in the first lower layer area L1, and the first inner step 510 is used to support another stage semi-finished product (not shown in the figure) so that it can be placed horizontally in the first upper layer area U1. The second inner step 610 is used to support another specific stage semi-finished product (not shown in the figure) so that it can be placed in the second upper layer area U2.

More specifically, the accommodating assembly 300 further includes a first base 700 and a second base 800. The first base 700 and the second base 800 are both overlapped on the same surface of the carrier 200 facing away from the base 100, and the first base 700 and the second base 800 are adjacent to each other. In this embodiment, the first base 700 and the second base 800 are respectively plate-shaped structures, and one side of the first base 700 and one side of the second base 800 are connected to each other.

The accommodating assembly 300 further includes two first corner frames 310, two second corner frames 330 and two side frames 350. The first corner frames 310 are separated from each other and are respectively fixed on a surface of the first base 700 that is opposite to the carrier 200. For example, the first corner frames 310 are opposite to each other on the surface (hereinafter referred to as the top surface 710) of the first base 700 that is opposite to the carrier 200. The side frames 350 are separated from each other and are respectively fixed on the first surface 210 of the carrier 200. For example, the side frames 350 are opposite to each other on the first surface 210 of the carrier 200. Therefore, the first base 700 , the first corner frames 310 and the side frames 350 together define the first groove 500 on the right side of the carrier 200 .

The second corner frames 330 are separated from each other and are respectively fixed on the first surface 210 of the carrier 200. For example, the second corner frames 330 are located on the first surface 210 of the carrier 200 opposite to each other, and each side frame 350 is located between one of the first corner frames 310 and one of the second corner frames 330. Therefore, the second base 800, the second corner frames 330 and the side frames 350 together define the second groove 600 on the left side of the carrier 200.

In addition, each first corner frame 310 has a first inner corner portion 320, each side frame 350 has a second inner corner portion 360 and a third inner corner portion 370 adjacent to each other, and each second corner frame 330 has a fourth inner corner portion 340. In this embodiment, the first inner steps 510 are respectively disposed on the first inner corner portions 320 and the second inner corner portions 360. In this embodiment, the side frame 350 is a T-shaped frame, including a baffle 351 and a cross rib 352, the cross rib 352 vertically extending from one side of the baffle 351, so that the cross rib 352 and the baffle 351 are divided into the second inner corner portion 360 and the third inner corner portion 370, however, the present invention is not limited thereto. The second inner steps 610 are respectively disposed on the third inner corners 370 and the fourth inner corners 340 .

In this embodiment, each first inner corner portion 320 includes a first connecting surface 321 and two first inner side surfaces 322. The first connecting surface 321 is located between these first inner side surfaces 322 and is respectively adjacent to these first inner side surfaces 322. Each second inner corner portion 360 includes a second connecting surface 361 and two second inner side surfaces 362. The second connecting surface 361 is located between these second inner side surfaces 362 and is respectively adjacent to these second inner side surfaces 362. More specifically, each first inner step 510 is substantially L-shaped, wherein one first inner step 510 is simultaneously connected to the top surface 710 of the first base 700, the first connecting surface 321 and the two first inner side surfaces 322, and another first inner step 510 is simultaneously connected to the two second inner side surfaces 362.

Each third inner corner portion 370 includes a third connection surface 371 and two third inner side surfaces 372, wherein the third connection surface 371 is located between the third inner side surfaces 372 and is respectively adjacent to the third inner side surfaces 372. Each fourth inner corner portion 340 includes a fourth connection surface 341 and two fourth inner side surfaces 342, wherein the fourth connection surface 341 is located between the fourth inner side surfaces 342 and is respectively adjacent to the fourth inner side surfaces 342. More specifically, each second inner step 610 is substantially L-shaped, wherein one second inner step 610 is connected to the third connection surface 371 and the two third inner side surfaces 372 at the same time, and another second inner step 610 is connected to the fourth connection surface 341 and the two fourth inner side surfaces 342 at the same time.

Thus, the first supporting plane V1 formed by the first inner steps 510 being aligned with each other is between the first upper layer area U1 and the first lower layer area L1 (FIG. 3). The second inner steps 610 are respectively arranged on the third inner corners 370 and the fourth inner corners 340, and the second supporting plane V2 formed by the second inner steps 610 being aligned with each other is between the second upper layer area U2 and the second lower layer area L2 (FIG. 3). However, the present invention is not limited thereto, and in other embodiments, the first inner steps 510 are not aligned with each other, and the second inner steps 610 are not aligned with each other.

In addition, each first inner step 510 further has a guiding slope 323, and the guiding slope 323 can guide the semi-finished product of a specific stage to move into the bottom of the first groove 500 (ie, the first lower layer area L1), however, the present invention is not limited thereto.

The first base 700 has two opposite first retracted portions 720 on one side facing the second base 800, the second base 800 has two opposite second retracted portions 820 on one side facing the first base 700, and has two opposite third retracted portions 830 on one side facing away from the first base 700. Each second inner corner portion 360 has a first flange portion 363. The first flange portion 363 is protrudingly disposed on the inner wall of the second inner corner portion 360 facing the first groove 500, and the other first inner step 510 simultaneously connects the second connecting surface 361, the second inner side surface 362 and the first flange portion 363. Thus, during assembly, since each first flange portion 363 extends laterally into one of the first retracted portions 720 in a matching manner, the first flange portion 363 and the top surface 710 of the first base 700 together form the bottom of the first groove 500 .

The second base 800 has two opposite second retracted portions 820 and two opposite third retracted portions 830. The second retracted portions 820 are oppositely located on a side of the second base 800 facing the first base 700. The third retracted portions 830 are oppositely located on a side of the second base 800 facing away from the first base 700, so that the second base 800 is in a cross shape.

Each third inner corner portion 370 has a second flange portion 373, which is protruded from the inner wall of one of the third inner corner portions 370 facing the second groove 600 and connected to the corresponding second inner step 610. Each fourth inner corner portion 340 has a third flange portion 343, which is protruded from the inner wall of one of the fourth inner corner portions 340 facing the second groove 600 and connected to the corresponding second inner step 610. Thus, during assembly, since the second flange portions 373 and the third flange portions 343 extend laterally into the second retracted portions 820 and the third retracted portions 830 respectively in a matching manner, the second flange portions 373, the third flange portions 343 and a surface of the second base 800 facing the second groove 600 (such as the top surface 810) together form the bottom of the second groove 600.

In this embodiment, the first base 700 further has a recessed portion 730 and a first through-hole 740, wherein the recessed portion 730 is formed on the top surface 710 of the first base 700, and the first through-hole 740 is opened at the bottom 731 of the recessed portion 730. The position and depth of the recessed portion 730 and the first through-hole 740 can be adjusted according to requirements or restrictions (e.g., the height of the protruding part of the stage semi-finished product). The second base 800 further has a protruding portion 840, which is protruding from the top surface 810 of the second base 800. The protruding portion 840 has a supporting surface 841, which is approximately flush with the second bearing plane V2 (Figure 3) for placing a specific stage semi-finished product. In addition, since the supporting surface 841 is planar, the semi-finished product can be fastened to the supporting surface 841 .

In addition, in this embodiment, the base 100 has one or more openings 130, each opening 130 passes through the base 100 and simultaneously connects the bearing surface 110 and the bottom surface 120 of the base 100. In this way, the opening 130 can not only reduce the weight of the base 100, but also provide more functionality for the composite material tray 10.

Figures 4A to 4F are operation diagrams of the composite material tray 10 of an embodiment of the present invention. As shown in Figures 4A to 4F, the composite material tray 10 is suitable for carrying semi-finished products that are sequentially completed in several stages of an assembly process. For example, the composite material tray 10 is used in the assembly process of electronic devices, and the assembly process includes three sections: the pre-test section, the assembly section, and the post-test section.

Before entering the front test section, as shown in Figures 1 and 4A, first place a wiring board 910 of the electronic device into the first groove 500 of the composite material tray 10 so that it lies flat on the bottom of the first groove 500 (i.e., the top surface 710 of the first base 700, in the first lower area L1, Figure 3), so that the composite material tray 10 can move the wiring board 910 into the front test section.

Next, the composite material tray 10 is moved to the assembly section, and the following steps are performed. As shown in FIG. 4B , when the wiring board 910 is on the top surface 710 of the first base 700, a heat sink assembly 920 is assembled on one side of the wiring board 910 (the whole is referred to as the circuit board module 930); then, the circuit board module 930 is taken out from the composite material tray 10, and a lower cover 940 is assembled on the circuit board module 930 by screw locking, as shown in FIG. 4C . The first semi-finished product 950 is placed in the second groove 600 of the composite material tray 10, so that the front side 941 of the lower cover 940 of the first semi-finished product 950 is placed flat on the support surface 841 and the second inner step 610 (such as in the second upper layer area U2, Figure 3), and the side of the circuit board module 930 facing away from the lower cover 940 is facing upward. Then, the first semi-finished product 950 is turned upside down, so that the end edge 942 of the lower cover 940 of the first semi-finished product 950 is placed flat on the second inner step 610 (such as in the second upper layer area U2, Figure 3), and the front side 941 of the lower cover 940 of the first semi-finished product 950 is facing upward (Figure 4D). Next, as shown in FIG. 4D , an information label 960 is pasted to the front side 941 of the lower cover 940 of the first semi-finished product 950 (hereinafter referred to as the second semi-finished product 970 ). Next, as shown in FIG. 4E , an upper cover 980 is placed flat on the first inner step 510 in the first cavity 500 (such as in the first upper layer area U1 , FIG. 3 ), so that the front side 981 of the upper cover 980 is placed flat on the first inner step 510. As shown in FIG. 4F , the second semi-finished product 970 is moved from the second cavity 600 to the first cavity 500 , so that the lower cover 940 of the second semi-finished product 970 covers the upper cover 980 in the first cavity 500 (such as in the first upper layer area U1 , FIG. 3 ). Next, as shown in FIG. 4F , the lower cover 940 is fastened to the upper cover 980 in the first groove 500 by screwing, so that the circuit board module 930 is accommodated between the upper cover 980 and the lower cover 940 (collectively referred to as the final semi-finished product 900, FIG. 4F ).

Next, the composite material tray 10 is moved to the post-test section to proceed to the following steps. As shown in FIG. 4G , the final semi-finished product 900 is turned upside down so that the front 941 of the lower cover 940 of the final semi-finished product 900 is placed flat on the first inner step 510 (such as in the first upper layer area U1, FIG. 3 ), and the front 981 of the upper cover 980 of the final semi-finished product 900 is facing upward, so that the composite material tray 10 can move the final semi-finished product 900 to the relevant test station and enter the post-test section.

Thus, through the structures of the above embodiments, the composite material tray 10 of the present invention can carry the semi-finished products completed in sequence in each stage of the assembly process, which greatly simplifies the number of types of trays and does not consume more manufacturing costs.

FIG. 5 is a top view of a composite material tray 11 of an embodiment of the present invention. As shown in FIG. 5 , the composite material tray 11 of the present embodiment is substantially the same as the composite material tray 10 of FIG. 1 , except that the receiving assembly 301 includes a rectangular frame 400 containing a first groove 500 and a second groove 600 instead of a segmented frame. The number of the first inner step 520 is a single one instead of a plurality, and the number of the second inner step 620 is a single one instead of a plurality. More specifically, in this embodiment, the rectangular frame 400 continuously surrounds the first groove 500 and the second groove 600, and the first inner step 520 is continuously formed on the inner wall of the rectangular frame 400, so that the above-mentioned stage semi-finished product can be placed more stably in the first groove 500. Similarly, the second inner step 620 is continuously formed on the inner wall of the rectangular frame 400. However, the present invention is not limited to this.

Finally, the above disclosed embodiments are not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications within the spirit and scope of the present invention, and all of them can be protected by the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the attached patent application.

10, 11: composite material tray 100: base 110: bearing surface 120: bottom surface 130: opening 200: carrier plate 210: first surface 220: second surface 300, 301: accommodating assembly 310: first corner frame 320: first inner corner 321: first connecting surface 322: first inner side surface 323: guiding slope 330: second corner frame 340: fourth inner corner 341: fourth connecting surface 342: fourth inner side surface 343: third flange 350: side frame 351: baffle 352: transverse rib 360: second inner corner 361: second connection surface 362: second inner side surface 363: first flange 370: third inner corner 371: third connection surface 372: third inner side surface 373: second flange 400: rectangular frame 500: first groove 510, 520: first inner step 600: second groove 610, 620: second inner step 700: first base 710: top surface 720: first retracted portion 730: recessed portion 731: bottom 740: first through-hole 800: second base 810: top surface 820: second retracted portion 830: third retracted portion 840: protrusion 841: Support surface 900: Final semi-finished product 910: Wiring board 920: Heat dissipation component 930: Circuit board module 940: Lower cover 941: Front 942: End edge 950: First semi-finished product 960: Information label 970: Second semi-finished product 980: Upper cover 981: Front AA: Line segment U1: First upper layer area L1: First lower layer area U2: Second upper layer area L2: Second lower layer area V1: First bearing plane V2: Second bearing plane

In order to make the above and other purposes, features, advantages and embodiments of the present invention more clearly understandable, the attached drawings are described as follows: Figure 1 is a schematic diagram of a composite material tray of an embodiment of the present invention; Figure 2 is an exploded view of the composite material tray of Figure 1; Figure 3 is a cross-sectional view along line segment AA of Figure 1; Figures 4A to 4G are respectively operation diagrams of the composite material tray of an embodiment of the present invention; and Figure 5 is a top view of the composite material tray of an embodiment of the present invention.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

10: Composite material tray

100: Base

110: Loading surface

120: Bottom

200: Carrier board

300: accommodating components

310: First corner frame

320: First inner corner

330: Second corner frame

350: Side frame

360: Second inner corner

370: Third inner corner

500: First groove

510: First inner level

600: Second groove

610: Second inner level

700: First base

710: Top

800: Second base

810: Top

840: protrusion

841: Support surface

AA: Line segment

Claims (10)

A composite material tray is used to carry multiple semi-finished products of different stages completed in sequence in several stages of an assembly process. The composite material tray includes: a base; a carrier plate located on one side of the base; and a receiving assembly located on the carrier plate, including a first groove and at least one first inner step, the first inner step protruding from the inner wall of the first groove, and dividing the first groove into a first upper layer area and a first lower layer area, wherein the first lower layer area is used to place one of the semi-finished products of different stages, and the first inner step is used to support the other semi-finished products of different stages located in the first upper layer area. The composite material tray as described in claim 1, wherein the accommodating component further comprises a second groove and at least a second inner step, the second groove is adjacent to the first groove, the second inner step is protruding from the inner wall of the second groove, and divides the second groove into a second upper layer area and a second lower layer area, wherein the second inner step is used to support another of the semi-finished products of the stages located in the second upper layer area. The composite material tray as described in claim 2, wherein the accommodating assembly further comprises: a first base, stacked on the carrier plate for placing the semi-finished product in one stage flat; and two first corner frames and two side frames, the first corner frames are separated from each other, the side frames are separated from each other, the first corner frames are respectively fixed on a side of the first base facing away from the carrier plate, each of the first corner frames has a first inner corner portion, the side frames are respectively fixed on a side of the carrier plate facing away from the base, each of the side frames has a second inner corner portion and a third inner corner portion adjacent to each other, The first base, the first corner frames and the side frames jointly define the first groove, the at least one first inner step includes a plurality of first inner steps, and the first inner steps are respectively arranged on the first inner corners and the second inner corners, and the supporting plane jointly formed by the first inner steps being aligned with each other is between the first upper layer area and the first lower layer area. The composite material tray as described in claim 3, wherein the accommodating assembly further comprises: a second base, stacked on the carrier and adjacent to the first base; and two second corner frames, the second corner frames are separated from each other, and the second corner frames are fixed on a side of the carrier facing away from the base, each of the second corner frames has a fourth inner corner, wherein the second base, the second corner frames and the side frames jointly define the second groove, the at least one second inner step comprises a plurality of second inner steps, and the second inner steps are respectively arranged on the third inner corners and the fourth inner corners, and the bearing plane formed by the second inner steps being aligned with each other is between the second upper layer area and the second lower layer area. A composite material tray as described in claim 4, wherein one side of the first base has two first retracted portions, the first retracted portions are opposite to each other, each of the second inner corner portions has a first flange portion, the first flange portion is protruded from the inner wall of the corresponding second inner corner portion facing the first groove, and the first flange portions are respectively matched to extend into the first retracted portions so that the first flange portions and the first base together form the bottom of the first groove. A composite material tray as described in claim 4, wherein the second base has two second retracted portions and two third retracted portions respectively, the second retracted portions are opposite to each other, the third retracted portions are opposite to each other, each of the third inner corner portions has a second flange portion, each of the fourth inner corner portions has a third flange portion, the second flange portions and the third flange portions respectively extend into the second retracted portions and the third retracted portions in a matching manner, so that the second flange portions, the third flange portions and the second base together form the bottom of the second groove. The composite material tray as described in claim 4, wherein the second base further has a protrusion, which is protruding from a surface of the second base facing the second groove. A composite material tray as described in claim 3, wherein the first base has a recessed portion and a through-opening, the recessed portion is formed on a surface of the first base facing the first groove, and the through-opening is formed on the bottom surface of the recessed portion. A composite material tray as described in claim 2, wherein the accommodating component comprises a rectangular frame containing the first groove and the second groove. A composite material tray as described in claim 1, wherein the base has at least one broken portion, and the broken portion penetrates the base.

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