CN217057467U

CN217057467U - Lamp fitting

Info

Publication number: CN217057467U
Application number: CN202220190863.XU
Authority: CN
Inventors: 唐逸文
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-07-26
Anticipated expiration: 2032-01-24

Abstract

The utility model discloses a lamp, it includes: a strip lamp assembly, a base and a lamp head. The strip lamp assembly comprises a power connector; the base is linked with the strip lamp component; the lamp holder is detachably positioned on the base and comprises a spiral connector which is electrically connected with the strip lamp assembly; wherein, one of the power connector or the screw connector can be electrically connected with a power source to drive the strip lamp component to shine.

Description

Lamp fitting

Technical Field

The utility model relates to a lamps and lanterns.

Background

The utility model of the bulb ensures that people can move freely at night without being limited by sunshine. With the development of a variety of bulbs, in addition to the conventional T8 fluorescent lamp, there are T5 lamps, LED lamps, power-saving bulbs, fluorescent lamps … …, and so on. Meanwhile, lamps such as ceiling lamps, semi-ceiling lamps, recessed lamps, wall lamps … …, etc. are becoming more diversified according to different use requirements.

However, the conventional strip lamp holder for mounting the strip lamp is mostly directly fixed to the ceiling, and the electrical property of the lamp holder is directly connected to the electrical wires of the building, so that the lamp holder has a large volume and requires direct connection of the electrical wires in series, which is inconvenient and unsafe for the assembly of unskilled people.

Therefore, there is a need for a new and improved lamp to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a lamp which adopts the electrical connection mode of a lamp holder, has smaller volume, is convenient to take and control, is favorable for installation and can greatly simplify the assembly difficulty; in addition, the strip lamp assembly is additionally provided with a power connector, so that a power line can be directly plugged for power supply, and a user can select a power supply mode according to requirements.

To achieve the above object, the present invention provides a lamp, including: a strip lamp assembly, a base and a lamp head. The strip lamp assembly comprises a power connector, wherein a power line is selectively plugged in the power connector to be electrically connected with a power source; the base is linked with the strip lamp component; the lamp holder is detachably positioned on the base and comprises a spiral connector which is electrically connected with the long lamp component and is selectively and electrically connected with a power supply; wherein, one of the power connector or the lamp cap can be electrically connected with a power source to drive the strip lamp component to shine.

Preferably, the base is connected to the elongated lamp assembly along a first direction, and the base includes a connecting portion, a first linking unit and at least one first conductive member, the connecting portion is connected to the elongated lamp assembly, the first linking unit and the at least one first conductive member are connected to the connecting portion, and the at least one first conductive member is electrically connected to the elongated lamp assembly; the lamp holder is connected to the base along the first direction, the lamp holder comprises a body, a second linking unit and at least one second conductive piece, the spiral connector is arranged at one end of the body, the second linking unit and the at least one second conductive piece are connected to the other end of the body, and the at least one second conductive piece is electrically connected with the spiral connector; the second linking unit is detachably connected to the first linking unit in a sliding manner along a second direction, so that the lamp cap is connected and positioned on the base, the at least one first conductive piece and the at least one second conductive piece are abutted against each other to be electrically connected, and the second direction is transverse to the first direction.

As a preferred preference of the above technical solution, preferably, the first linking unit includes two first slide rails, the two first slide rails extend along the second direction, each of the first slide rails includes a first connecting wall portion and a first blocking wall, one end of the first connecting wall portion is connected to the assembly portion, the first blocking wall is transversely connected to the other end of the first connecting wall portion, and further the first connecting wall portion and the first blocking wall define a first sliding slot; the second linking unit comprises two second slide rails, the two second slide rails extend along the second direction, each second slide rail comprises a second connecting wall part and a second blocking wall, one end of the second connecting wall part is connected to the body, the second blocking wall is transversely connected to the other end of the second connecting wall part, and a second sliding groove is defined by the second connecting wall part and the second blocking wall; when the first blocking wall is slidably inserted into the second sliding groove along the second direction, the second blocking wall is slidably inserted into the first sliding groove along the second direction, and the first blocking wall and the second blocking wall are blocked and interfered with each other in the first direction.

Preferably, one of the notches of the first sliding grooves of the two first sliding rails and the notches of the second sliding grooves of the two second sliding rails are arranged in a back-to-back manner, and the other is arranged in a face-to-face manner.

Preferably, the first linking unit further includes a first main body, the at least one first conductive member is located in the first main body, the two first slide rails are disposed at intervals to define a first accommodating space, and the first main body is located in the first accommodating space; the second linking unit further includes a second main body, the at least one second conductive member is positioned in the second main body, the second slide rail boundaries are arranged at intervals to define a second accommodating space, the second main body is positioned in the second accommodating space and arranged at intervals with the second slide rail to define two slots; when the lamp holder is connected and positioned on the base, the two first sliding rails and the first main body are inserted into the second accommodating space, the two first sliding rails are inserted into the two slots, and the second main body is inserted into the first accommodating space.

Preferably, as the above technical solution, a first positioning portion is disposed on the first main body in an extending manner along the second direction, a second positioning portion is disposed on the second main body in an extending manner along the second direction, one of the first positioning portion and the second positioning portion is a rib, and the other is a groove, when the lamp cap is connected and positioned on the base, the first positioning portion and the second positioning portion are combined in an inserting manner.

Preferably, the first body is provided with at least one first abutting portion extending along the second direction, the second body is provided with at least one second abutting portion extending along the second direction, and one of the at least one first abutting portion and the at least one second abutting portion is a convex portion and the other is a concave portion; when the lamp cap is connected and positioned on the base, the at least one first abutting part and the at least one second abutting part are in mutual concave-convex abutting joint.

Preferably, the first linking unit further includes two first stopping walls, the second linking unit further includes two second stopping walls, when the lamp cap is connected and positioned on the base, the two first stopping walls are used for stopping the two second slide rails, and the two second stopping walls are used for stopping the two first slide rails.

Preferably, the elongated lamp assembly includes a lamp strip and a reflector, the combining portion includes an engaging receptacle and two protruding wings, when the base is disposed on the elongated lamp assembly, the lamp strip is embedded in the engaging receptacle, and the two protruding wings protrude from two sides of the engaging receptacle to shield and stop the reflector.

Preferably, in the above-described aspect, one of the notches of the first sliding grooves of the two first sliding rails and the notches of the second sliding grooves of the two second sliding rails is disposed in a back-to-back manner, and the other is disposed in a face-to-face manner; a first positioning part is arranged on the first main body in an extending way along the second direction, a second positioning part is arranged on the second main body in an extending way along the second direction, one of the first positioning part and the second positioning part is a convex rib, the other one is a containing groove, and when the lamp cap is connected and positioned on the base, the first positioning part and the second positioning part are mutually spliced and combined; the first link unit further comprises two first stopping walls, the second link unit further comprises two second stopping walls, when the lamp cap is connected and positioned on the base, the two first stopping walls are used for stopping the two second slide rails, and the two second stopping walls are used for stopping the two first slide rails; the long lamp assembly comprises a lamp strip and a reflector, the combining part comprises an embedding containing part and two convex wings, when the base is arranged on the long lamp assembly, the lamp strip is embedded into the embedding containing part, and the two convex wings protrude out of two sides of the embedding containing part to shield and stop the part of the reflector; viewed along the second direction, the first connecting wall and the first blocking wall are L-shaped, and the second connecting wall and the second blocking wall are L-shaped; the number of the at least one first conductive piece is two, the number of the at least one second conductive piece is two, the two first conductive pieces are in a straight strip shape, and the two second conductive pieces are in a clamp shape; the two first slide rails are symmetrically arranged by taking the first main body as the center, and the two second slide rails are symmetrically arranged by taking the second main body as the center.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of an embodiment of the present invention in a use state.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a perspective view of a lamp cap according to an embodiment of the present invention.

Fig. 4 is a perspective view of a base according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of the base and the cap of fig. 1 engaged with each other.

Fig. 6 is another cross-sectional view of the base and cap of fig. 1 engaged with each other.

Fig. 7 is a partial sectional view of the first slide rail and the second slide rail of the embodiment of the present invention in sliding connection with each other.

Fig. 8 is a perspective view of another usage state of the present invention.

Wherein, 1, the strip lamp component; 11, a power supply connector; 12, a light bar; 13, a reflector; 2, a base; 21, a combining part; 211, a tabling containing part; 212, a convex wing; 22, a combining part; 3, a lamp holder; 31, a body; 32, a spiral connector; 4, a first linking unit; 41, a first slide rail; 42 a first connecting wall portion; 43: a first retaining wall; 44, a first chute; 45: a first body; 46, a first contraposition part; 47 a first abutting portion; 48, a first accommodating space; 5, a second linking unit; 51, a second slide rail; 52 a second connecting wall portion; 53, a second retaining wall; 54, a second chute; 55: a second body; 56, a second contraposition part; 57 a second abutment; 58, a second accommodating space; 59, a slot; 61, a first stop wall; 62, a second stopping wall; 71 a first conductive member; 72, a second conductive member; 81, a first direction; 82, a second direction; and 9, power lines.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The following description is given by way of example only, and not for the purpose of limiting the scope of the present invention, wherein the terms "a" or "an" or "at least one" are used herein without limitation to any number, but also to the contrary, as required, and the number is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

Referring to fig. 1 to 8, an embodiment of the present invention is shown, in which a lamp includes: a strip lamp assembly 1, a base 2 and a lamp cap 3.

The strip lamp assembly 1 comprises a power connector 11, wherein the power connector 11 is used for selectively plugging a power wire 9 to electrically connect with a power source; the base 2 is linked to the strip lamp assembly 1; the lamp head 3 is detachably positioned on the base 2, the lamp head 3 comprises a screw connector 32, the screw connector 32 is electrically connected to the strip lamp assembly 1, and the screw connector 32 is selectively electrically connected to a power source; one of the power connector 11 or the screw connector 32 can be electrically connected to a power source to drive the strip lamp assembly 1 to illuminate, so that a user can have two different power connection modes to meet different use requirements.

In detail, the base 2 is connected to the strip lamp assembly 1 along a first direction 81, the base 2 includes a connecting portion 21, a connecting portion 22, a first linking unit 4 and at least one first conductive member 71, the connecting portion 21 is connected to the strip lamp assembly 1, the first linking unit 4 and the at least one first conductive member 71 are connected to the connecting portion 22, and the at least one first conductive member 71 is electrically connected to the strip lamp assembly 1. In the embodiment, the elongated lamp assembly 1 includes a lamp strip 12 and a reflector 13, the combining portion 21 includes an engaging receptacle 211 and two protruding wings 212, when the base 2 is disposed on the elongated lamp assembly 1, the lamp strip 12 is inserted into the engaging receptacle 211, the two protruding wings 212 protrude from two sides of the engaging receptacle 211 to shield and stop portions of the reflector 13, and the two protruding wings 212 can be used to support and limit the reflector 13.

More specifically, the lamp cap 3 is connected to the base 2 along the first direction 81, the lamp cap 3 includes a body 31, a second linking unit 5 and at least one second conductive member 72, the screw connector 32 is disposed at one end of the body 31, the second linking unit 5 and the at least one second conductive member 72 are connected to the other end of the body 31, and the at least one second conductive member 72 is electrically connected to the screw connector 32; the second linking unit 5 is detachably slidably connected to the first linking unit 4 along a second direction 82, so that the lamp head 3 is connected to and positioned on the base 2, the at least one first conductive member 71 and the at least one second conductive member 72 are abutted against each other to be electrically connected, and the second direction 82 is transverse to the first direction 81.

It should be noted that the lamp holder electrically cooperating with the screw connector 32 has a small volume, so that the worker can easily carry the lamp holder to climb high for installation, and the installation difficulty can be effectively simplified, so that the worker can easily and quickly perform installation operation. Moreover, the base 2 is combined with or separated from the lamp head 3 through a sliding manner, which is helpful for a common user in daily life to replace or clean the components of the strip lamp assembly 1, and in addition, when at least one of the lamp head 3, the base 2 and the strip lamp assembly 1 is damaged, only the damaged part can be replaced without replacing the whole set of lamps.

More specifically, the first linking unit 4 includes two first sliding rails 41, the two first sliding rails 41 extend along the second direction 82, each first sliding rail 41 includes a first connecting wall portion 42 and a first blocking wall 43, one end of the first connecting wall portion 42 is connected to the assembling portion 22, the first blocking wall 43 is transversely connected to the other end of the first connecting wall portion 42, and the first connecting wall portion 42 and the first blocking wall 43 define a first sliding slot 44. Similarly, the second linking unit 5 includes two second slide rails 51, the second slide rails 51 extend along the second direction 82, each second slide rail 51 includes a second connecting wall portion 52 and a second blocking wall 53, one end of the second connecting wall portion 52 is connected to the body 31, the second blocking wall 53 is transversely connected to the other end of the second connecting wall portion 52, and a second sliding slot 54 is defined by the second connecting wall portion 52 and the second blocking wall 53. When the first blocking wall 43 is slidably inserted into the second sliding groove 54 along the second direction 82, the second blocking wall 53 is slidably inserted into the first sliding groove 44 along the second direction 82, and the first blocking wall 43 and the second blocking wall 53 are blocked and interfered with each other along the first direction 81, so that the lamp cap 3 and the base 2 are stably connected to each other. In the present embodiment, viewed along the second direction 82, the first connecting wall 42 and the first blocking wall 43 are L-shaped, the second connecting wall 52 and the second blocking wall 53 are L-shaped, and one of the notches of the first sliding grooves 44 of the two first sliding rails 41 and the notch of the second sliding grooves 54 of the two second sliding rails 51 is disposed in a back-to-back manner, and the other is disposed in a face-to-face manner.

More specifically, the first linking unit 4 further includes a first main body 45, the at least one first conductive member 71 is positioned in the first main body 45, the two first slide rails 41 are disposed at intervals to define a first accommodating space 48, the first sliding slots 44 of the two first slide rails 41 are not connected to the first accommodating space 48, and the first main body 45 is positioned in the first accommodating space 48. The second linking unit 5 further includes a second main body 55, the at least one second conductive member 72 is positioned on the second main body 55, the two second slide rails 51 are spaced apart from each other to define a second accommodating space 58, the second sliding slots 54 of the two second slide rails 51 are communicated with the second accommodating space 58, and the second main body 55 is positioned in the second accommodating space 58 and spaced apart from the two second slide rails 51 to define two slots 59.

When the lamp cap 3 is connected and positioned on the base 2, the two first sliding rails 41 and the first main body 45 are inserted into the second accommodating space 58, the two first sliding rails 41 are inserted into the two slots 59, and the second main body 55 is inserted into the first accommodating space 48, so that the mutual insertion structural configuration can improve the joint strength of the lamp cap 3 and the base 2, and more interference constraints can be generated in the direction perpendicular to the first direction 81 and the second direction 82, thereby effectively improving the joint stability.

It is understood that the first body 45 and the second body 55 can provide more structural space for accommodating the at least one first conductive element 71 and the at least one second conductive element 72, and can have better structural rigidity for positioning and limiting the at least one first conductive element 71 and the at least one second conductive element 72. In the present embodiment, the two first slide rails 41 are symmetrically disposed with the first body 45 as the center, and similarly, the two second slide rails 51 are symmetrically disposed with the second body 55 as the center; moreover, the number of the at least one first conductive member 71 is two, the number of the at least one second conductive member 72 is two, the two first conductive members 71 are in a straight strip shape, the two second conductive members 72 are in a clip shape, and the two first conductive members 71 are respectively inserted into the two second conductive members 72 along the second direction 82 to achieve the purpose of electrical connection.

Preferably, the first linking unit 4 further comprises two first stopping walls 61, the second linking unit 5 further comprises two second stopping walls 62, when the lamp head 3 is connected and positioned on the base 2, the two first stopping walls 61 are used for stopping the two second sliding rails 51, and the two second stopping walls 62 are used for stopping the two first sliding rails 41, so that an assembler can know that the lamp head 3 and the base 2 reach a predetermined combining position.

Preferably, a first positioning portion 46 is disposed on the first main body 45 in an extending manner along the second direction 82, a second positioning portion 56 is disposed on the second main body 55 in an extending manner along the second direction 82, one of the first positioning portion 46 and the second positioning portion 56 is a rib, and the other is a groove, when the lamp holder 3 is connected and positioned on the base 2, the first positioning portion 46 and the second positioning portion 56 are combined in an inserting manner. It is emphasized that the first and

second counterpoint portions

46, 56 serve multiple functions: when the first slide rail 41 or the second slide rail 51 is damaged, the first positioning portion 46 and the second positioning portion 56 can be used as an auxiliary guide for moving the lamp head 3 along the second direction 82 relative to the base 2, and when the first stop wall 61 or the second stop wall 62 is damaged, the first positioning portion 46 and the second positioning portion 56 can be used as a stop mechanism in the second direction 82, or provide additional restraint in a direction perpendicular to the first direction 81 and the second direction 82, so as to prevent the lamp head 3 from arbitrarily swinging relative to the base 2.

Preferably, the first body 45 is provided with at least one first abutting portion 47 extending along the second direction 82, the second body 55 is provided with at least one second abutting portion 57 extending along the second direction 82, one of the at least one first abutting portion 47 and the at least one second abutting portion 57 is a convex portion, and the other one is a concave portion; when the lamp cap 3 is connected and positioned on the base 2, the at least one first abutting portion 47 and the at least one second abutting portion 57 are in concave-convex abutting contact with each other, so that the contact area between the lamp cap 3 and the base 2 is increased, and further, additional constraint can be provided in the direction perpendicular to the first direction 81 and the second direction 82.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A light fixture, comprising:

a strip lamp assembly including a power connector for selectively plugging a power cord to electrically connect to a power source;

a base linked to the strip lamp assembly; and

a lamp cap detachably positioned on the base, comprising a screw connector electrically connected with the strip lamp assembly, the screw connector being selectively electrically connected with a power source;

wherein, one of the power connector or the screw connector can be electrically connected with a power source to drive the strip lamp component to shine.

2. The lamp of claim 1, wherein the base is connected to the elongated lamp assembly along a first direction, the base comprises a connecting portion, a first linking unit and at least one first conductive member, the connecting portion is connected to the elongated lamp assembly, the first linking unit and the at least one first conductive member are connected to the connecting portion, and the at least one first conductive member is electrically connected to the elongated lamp assembly; the lamp holder is connected to the base along the first direction and comprises a body, a second linking unit and at least one second conductive piece, the spiral joint is arranged at one end of the body, the second linking unit and the at least one second conductive piece are connected to the other end of the body, and the at least one second conductive piece is electrically connected with the spiral joint; the second linking unit is detachably slidably connected to the first linking unit along a second direction, so that the lamp cap is connected and positioned on the base, the at least one first conductive piece and the at least one second conductive piece are abutted against each other to be electrically connected, and the second direction is transverse to the first direction.

3. The lamp of claim 2, wherein the first linking unit comprises two first sliding rails extending along the second direction, each of the first sliding rails comprises a first connecting wall portion and a first blocking wall, one end of the first connecting wall portion is connected to the assembly portion, the first blocking wall is transversely connected to the other end of the first connecting wall portion, and the first connecting wall portion and the first blocking wall define a first sliding slot; the second linking unit comprises two second slide rails, the two second slide rails extend along the second direction, each second slide rail comprises a second connecting wall part and a second blocking wall, one end of the second connecting wall part is connected to the body, the second blocking wall is transversely connected to the other end of the second connecting wall part, and a second sliding chute is defined by the second connecting wall part and the second blocking wall; when the first blocking wall is slidably inserted into the second sliding groove along the second direction, the second blocking wall is slidably inserted into the first sliding groove along the second direction, and the first blocking wall and the second blocking wall are blocked and interfered with each other in the first direction.

4. The lamp of claim 3, wherein one of the notches of the first sliding grooves of the two first sliding rails and the notches of the second sliding grooves of the two second sliding rails are disposed oppositely and the other one is disposed oppositely.

5. The lamp of claim 3, wherein the first linking unit further comprises a first body, the at least one first conductive member is positioned in the first body, the two first sliding rails are spaced apart to define a first receiving space, and the first body is positioned in the first receiving space; the second linking unit further includes a second main body, the at least one second conductive member is positioned in the second main body, the second slide rail boundaries are spaced to define a second accommodating space, the second main body is positioned in the second accommodating space and spaced from the second slide rail boundaries to define two slots; when the lamp holder is connected and positioned on the base, the two first sliding rails and the first main body are inserted into the second accommodating space, the two first sliding rails are inserted into the two slots, and the second main body is inserted into the first accommodating space.

6. The lamp of claim 5, wherein a first positioning portion is disposed on the first body and a second positioning portion is disposed on the second body and extends along the second direction, one of the first positioning portion and the second positioning portion is a rib and the other is a groove, and when the lamp cap is coupled to the base, the first positioning portion and the second positioning portion are engaged with each other.

7. The lamp according to claim 5, wherein the first body has at least one first abutting portion extending along the second direction, the second body has at least one second abutting portion extending along the second direction, one of the at least one first abutting portion and the at least one second abutting portion is a convex portion, and the other one of the at least one first abutting portion and the at least one second abutting portion is a concave portion; when the lamp cap is connected and positioned on the base, the at least one first abutting part and the at least one second abutting part are in mutual concave-convex abutting joint.

8. The lamp of claim 5, wherein the first linking unit further comprises two first stopping walls, the second linking unit further comprises two second stopping walls, and when the lamp cap is fixed to the base, the two first stopping walls are used for stopping the two second sliding rails, and the two second stopping walls are used for stopping the two first sliding rails.

9. The lamp according to any one of claims 2-8, wherein the elongated lamp assembly comprises a light bar and a reflector, the coupling portion comprises an engaging receptacle and two protruding wings, when the base is disposed on the elongated lamp assembly, the light bar is inserted into the engaging receptacle, and the two protruding wings protrude from two sides of the engaging receptacle to block and block a portion of the reflector.

10. The lamp of claim 7, wherein one of the notches of the first sliding grooves of the two first sliding rails and the notches of the second sliding grooves of the two second sliding rails are disposed oppositely and the other one is disposed oppositely; a first positioning part is arranged on the first main body in an extending way along the second direction, a second positioning part is arranged on the second main body in an extending way along the second direction, one of the first positioning part and the second positioning part is a convex rib, the other one is a containing groove, and when the lamp holder is connected and positioned on the base, the first positioning part and the second positioning part are mutually spliced and combined; the first link unit further comprises two first stopping walls, the second link unit further comprises two second stopping walls, when the lamp holder is connected and positioned on the base, the two first stopping walls are used for stopping the two second slide rails, and the two second stopping walls are used for stopping the two first slide rails; the long lamp assembly comprises a lamp strip and a reflector, the combining part comprises an embedding containing part and two convex wings, when the base is arranged on the long lamp assembly, the lamp strip is embedded into the embedding containing part, and the two convex wings protrude out of two sides of the embedding containing part to shield and stop the part of the reflector; viewed along the second direction, the first connecting wall and the first blocking wall are L-shaped, and the second connecting wall and the second blocking wall are L-shaped; the number of the at least one first conductive piece is two, the number of the at least one second conductive piece is two, the two first conductive pieces are in a straight strip shape, and the two second conductive pieces are in a clamp shape; the two first slide rails are symmetrically arranged by taking the first main body as the center, and the two second slide rails are symmetrically arranged by taking the second main body as the center.