Lamp

Abstract

The utility model discloses a lamp, relates to lighting equipment technical field, the lamp includes lamp body portion, lamp holder portion and rotating shaft structure, rotating shaft structure includes axle seat, axle lever, rotating piece and elastic piece, axle seat's two opposite side walls are respectively provided with first axle hole, the rotating piece's two opposite side walls are respectively provided with second axle hole, the first axle hole and the second axle hole are respectively provided with elastic piece. The rotating part is sleeved with the shaft seat, the first shaft hole is communicated with the second shaft hole, and the shaft rod penetrates through the first shaft hole and the second shaft hole, so that the rotating part and the shaft seat can relatively rotate around the axial direction of the shaft rod; the shaft rod comprises a first end and a second end which are opposite to each other, the first end protrudes out of the outer surface of the shaft seat and is provided with a shaft cap, the second end is connected with the side wall of the shaft seat, the elastic piece is elastically supported between the shaft cap and the outer surface of the shaft seat, and under elastic supporting of the elastic piece, the side wall of the shaft seat and the side wall of the rotating piece can be always in an attached state. And the durability and the stability of the lamp are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, in particular to a lamp. Background Art

[0002] With the improvement of living standards, in order to meet the diverse needs of consumers, manufacturers continue to improve and upgrade the appearance and structure of lamps, making lamps increasingly convenient and highly reliable.

[0003] In the related art, the lamp includes a lamp holder, a lamp post and a lamp head. In order to facilitate flexible adjustment of the illumination area of ​​the lamp, a friction damping shaft is set between the lamp holder and the lamp post, between the lamp post and the lamp head, etc. The friction damping shaft is used to enable relative rotation between the lamp holder and the lamp post, and between the lamp post and the lamp head, thereby changing the posture of the lamp to adjust the illumination area of ​​the lamp.

[0004] Then, when the friction damping shaft rotates, wear will inevitably occur inside the shaft, which causes the fitting clearance inside the shaft to become larger, resulting in a large degree of shaking of the lamp when it rotates, thereby affecting the durability and stability of the lamp. Utility Model Content

[0005] The utility model discloses a lamp to solve the problem in the related art that due to the internal wear of the rotating shaft, the matching clearance inside the rotating shaft becomes larger, resulting in a large degree of shaking of the lamp when rotating, thereby affecting the durability and stability of the lamp.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] The technical solution of the utility model discloses a lamp, which comprises a lamp body, a lamp holder and a rotating shaft structure, wherein the rotating shaft structure comprises: a shaft seat, a shaft rod, a rotating part and an elastic part;

[0008] The two opposite side walls of the shaft seat are respectively provided with a first shaft hole, and the two opposite side walls of the rotating member are respectively provided with a second shaft hole, the shaft seat is sleeved on the rotating member, and the first shaft hole is communicated with the second shaft hole, and the shaft rod is passed through the first shaft hole and the second shaft hole, so that the rotating member and the shaft seat can rotate relative to each other around the axial direction of the shaft rod, the rotating member is used to connect the lamp body part, and the shaft seat is used to connect the lamp holder part;

[0009] The shaft rod includes a first end and a second end facing each other, the first end protruding from the outer surface of the shaft seat, and the first end is provided with a shaft cap, the second end is connected to the side wall of the shaft seat, and the elastic member is elastically supported between the shaft cap and the outer surface of the shaft seat so that the side wall of the shaft seat fits with the side wall of the rotating member.

[0010] Optionally, the elastic member includes an elastic shell, which is provided with a through hole, and the elastic shell is sleeved on the shaft rod through the through hole, and two opposite side walls of the elastic shell form an elastic buffer space, and the two side walls are respectively abutted against the outer surfaces of the shaft cap and the shaft seat.

[0011] Optionally, the elastic shell includes a first disc-shaped elastic sheet and a second disc-shaped elastic sheet, the first disc-shaped elastic sheet and the second disc-shaped elastic sheet are buckled together to enclose the elastic buffer space, and the first disc-shaped elastic sheet and the second disc-shaped elastic sheet are respectively provided with the through hole.

[0012] Optionally, the rotating shaft structure further includes a torsion spring, wherein the torsion spring is sleeved on the shaft rod, and two ends of the torsion spring are respectively in contact with the shaft seat and the rotating member.

[0013] Optionally, the rotating shaft structure further includes a first friction pad and a second friction pad, wherein the first friction pad and the second friction pad are respectively sleeved on the shaft rod and are respectively located in a gap formed by the shaft seat and the rotating member.

[0014] Optionally, the rotating shaft structure further includes a protective gasket, which is sleeved on the shaft rod and located between the elastic member and the outer surface of the shaft seat.

[0015] Optionally, the rotating shaft structure further includes a fastening nut, the fastening nut is connected to the side wall of the shaft seat, and the second end of the shaft rod is threadedly connected to the fastening nut.

[0016] Optionally, the outer side wall of the shaft seat is provided with a fixing groove, the fixing groove is communicated with the first shaft hole, and the fastening nut is clamped in the fixing groove.

[0017] Optionally, the rotating member is provided with a protruding connection portion, and the connection portion is used to connect the lamp body. Optionally, the shaft seat and the rotating member are both provided with a bolt mounting structure, and are respectively bolted to the lamp holder and the lamp body through the bolt mounting structure.

[0018] The technical solution adopted by the utility model can achieve the following technical effects:

[0019] In the lamp disclosed by the technical solution of the utility model, the rotating shaft structure includes an axle seat, an axle rod, a rotating member and an elastic member, the two opposite side walls of the axle seat are respectively provided with a first axle hole, the two opposite side walls of the rotating member are respectively provided with a second axle hole, the axle seat is sleeved on the rotating member, and the first axle hole is communicated with the second axle hole, the axle rod is passed through the first axle hole and the second axle hole, so that the rotating member and the axle seat can rotate relative to each other around the axial direction of the axle rod, thereby driving the lamp body part and the lamp holder part of the lamp to rotate relative to each other around the axial direction of the axle rod. The axle rod includes a first end and a second end opposite to each other, the first end protrudes from the outer surface of the axle seat, and the first end is provided with an axle cap, and the second end is connected to the side wall of the axle seat, the elastic member is elastically supported between the axle cap and the outer surface of the axle seat, and under the elastic support of the elastic member, the side wall of the axle seat and the side wall of the rotating member can always be in a fitting state, thereby reducing the matching clearance between the axle seat and the rotating member, so that the lamp is not easy to produce a large amplitude of shaking when rotating, thereby improving the durability and stability of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded view of the lamp disclosed in the embodiment of the utility model;

[0021] Figure 2 This is one of the cross-sectional views of the lamp disclosed in the embodiment of the utility model;

[0022] Figure 3 The specification of this utility model is attached Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 This is the second cross-sectional view of the lamp disclosed in the embodiment of the utility model;

[0024] Figure 5 The specification of this utility model is attached Figure 4 The enlarged view of point B in the middle;

[0025] Figure 6 It is a schematic diagram of the structure of the elastic member disclosed in the embodiment of the utility model;

[0026] Figure 7 It is a schematic diagram of the matching structure of the shaft seat and the rotating member disclosed in the embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 100-rotating shaft structure, 110-shaft seat, 111-first shaft hole, 112-fixing groove, 120-shaft rod, 121-shaft cap, 130-rotating member, 131-second shaft hole, 132-connecting portion, 140-elastic member, 141-first disc-shaped spring sheet, 142-second disc-shaped spring sheet, 143-through hole, 150-torsion spring, 160-first friction gasket, 170-second friction gasket, 180-protective gasket, 190-fastening nut;

[0029] 200-lamp, 210-lamp body, 220-lamp holder. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present utility model can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0032] The technical solutions disclosed in various embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0033] Please refer to Figures 1 to 7 The embodiment of the utility model discloses a lamp 200, wherein the lamp 200 may include a table lamp, a spotlight, a floor lamp, etc. The lamp 200 may include a lamp body portion 210 and a lamp holder portion 220. Taking a table lamp as an example, the table lamp may include a lamp holder, a lamp pole and a lamp head. The lamp holder is placed on the surface of a carrier and supports the lamp head through the lamp pole. The lamp head is provided with a light-emitting module. The lamp body portion 210 may correspond to the lamp pole and the lamp head, and the lamp holder portion 220 may correspond to the lamp holder. The lamp body portion 210 and the lamp holder portion 220 are connected by the above-mentioned rotating shaft structure 100, so that the posture of the lamp 200 can be changed by rotating around the rotating shaft structure 100 to adjust the irradiation area of ​​the lamp 200, thereby improving the flexibility of the use of the lamp 200.

[0034] The above-mentioned rotating shaft structure 100 may include an axle seat 110, a shaft rod 120, a rotating member 130 and an elastic member 140. First axle holes 111 are respectively provided on two opposite side walls of the axle seat 110, and the number of the first axle holes 111 is two. Second axle holes 131 are respectively provided on two opposite side walls of the rotating member 130, and the number of the second axle holes 131 is also two. The axle seat 110 is provided with a mounting groove for accommodating the rotating member 130, so that the axle seat 110 can be sleeved on the rotating member 130; the two first axle holes 111 and the two second axle holes 131 are connected to each other, and the shaft rod 120 is penetrated through the two first axle holes 111 and the two second axle holes 131, and the axle seat 110 and the rotating member 130 are connected in series, so that the rotating member 130 and the axle seat 110 can rotate relative to each other around the axial direction of the shaft rod 120.

[0035] The rotating member 130 is used to connect the lamp body 210 of the lamp 200, and the shaft seat 110 is used to connect the lamp holder 220 of the lamp 200. The rotating member 130 and the shaft seat 110 can be used to relatively rotate around the axial direction of the shaft 120 to drive the lamp body 210 and the lamp holder 220 of the lamp 200 to rotate relative to each other. Exemplarily, the rotating shaft structure 100 is arranged between the lamp pole and the lamp holder, the rotating member 130 is connected to the lamp pole, and the shaft seat 110 is connected to the lamp holder, so that the lamp pole and the lamp holder can rotate relative to each other around the axial direction of the shaft 120.

[0036] The shaft 120 includes a first end and a second end facing each other. The first end of the shaft 120 protrudes from the outer surface of the shaft seat 110, and the first end of the shaft 120 is provided with a shaft cap 121. The diameter of the shaft cap 121 is slightly larger than the diameter of the first shaft hole 111, which can prevent the shaft cap 121 from extending into the first shaft hole 111. The second end of the shaft 120 is connected to the side wall of the shaft seat 110, and the shaft cap 121 is pressed against the outer surface of the shaft seat 110, thereby locking the shaft seat 110 and the rotating member 130. The second end of the shaft 120 and the side wall of the shaft seat 110 can be assembled by bolt connection, clamping, etc.

[0037] During the relative rotation of the rotating member 130 and the shaft seat 110, the side wall of the rotating member 130 and the side wall of the shaft seat 110 will contact and rub, and the rotating member 130 and the shaft seat 110 will inevitably wear, which will lead to an increase in the matching clearance between the rotating member 130 and the shaft seat 110. Due to the increase in the matching clearance between the rotating member 130 and the shaft seat 110, the lamp body 210 and the lamp holder 220 of the lamp 200 will shake and jam when they rotate relative to each other.

[0038] Based on the above situation, an elastic member 140 can be arranged between the shaft cap 121 and the outer surface of the shaft seat 110. The elastic member 140 can be a metal spring, a rubber member, a silicone member or other component that can store elastic potential energy. The elastic member 140 is elastically supported between the shaft cap 121 and the outer surface of the shaft seat 110. When the rotating member 130 and the shaft seat 110 are worn and the fitting clearance increases, the elastic member 140 will release a certain elastic force. Under the push of the elastic member 140, the side wall of the shaft seat 110 can be slightly deformed toward the rotating member 130 to reduce the fitting clearance between the rotating member 130 and the shaft seat 110, so that the side wall of the shaft seat 110 and the side wall of the rotating member 130 are always in a fitted state, thereby avoiding the problem of shaking of the rotating member 130 and the shaft seat 110.

[0039] From the above, it can be known that the shaft structure 100 disclosed in the embodiment of the utility model improves the relevant technology. By setting an elastic member 140 between the shaft cap 121 and the outer surface of the shaft seat 110, under the elastic support of the elastic member 140, the side wall of the shaft seat 110 and the side wall of the rotating member 130 can always be in a fit state, thereby reducing the fitting clearance between the shaft seat 110 and the rotating member 130, making it difficult for the lamp 200 to shake significantly when rotating, thereby improving the durability and stability of the lamp 200.

[0040] Furthermore, if Figures 1 to 3 , Figure 6 As shown, the elastic member 140 includes an elastic shell, which can be made of a material with a certain elasticity such as metal or plastic; the elastic shell is provided with a through hole 143, and the elastic shell is sleeved on the shaft rod 120 through the through hole 143. The two opposite side walls of the elastic shell form an elastic buffer space, and the two side walls of the elastic shell are respectively abutted against the shaft cap 121 and the outer surface of the shaft seat 110.

[0041] Since the elastic shell can compress or expand the elastic buffer space by axial deformation along the shaft rod 120, when the elastic shell is installed, the elastic buffer space inside the elastic shell can be in a compressed state to accumulate elastic potential energy. When the fitting clearance between the shaft seat 110 and the rotating part 130 increases due to wear, the elastic shell releases part of the elastic potential energy and the elastic buffer space expands, so that the two opposite side walls of the elastic shell push against the shaft cap 121 and the shaft seat 110 respectively. The force applied by the elastic shell to the shaft cap 121 will be applied to the shaft seat 110 in the opposite direction, so that the shaft seat 110 is slightly deformed toward the rotating part 130, thereby continuing to maintain a fitting relationship with the rotating part 130, thereby reducing the shaking between the shaft seat 110 and the rotating part 130.

[0042] The elastic housing can be an integral housing or a split housing. Figure 6As shown, in an optional embodiment of the present application, the elastic shell adopts a split shell, which may specifically include a first disc-shaped spring piece 141 and a second disc-shaped spring piece 142. The first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 may be made of a material having a certain elasticity such as metal or plastic. The first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 are buckled together to enclose the above-mentioned elastic buffer space. The first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 are respectively provided with through holes 143, so that the first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 can be respectively sleeved on the shaft 120. It should be noted that the first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 are bent to form a groove. When the first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 are buckled together, the side provided with the groove is spliced ​​to form the above-mentioned elastic buffer space. The first disc-shaped spring piece 141 and the second disc-shaped spring piece 142 can compress or expand the elastic buffer space by elastic deformation.

[0043] In some optional embodiments, such as Figures 1 to 5 As shown, the rotating shaft structure 100 may further include a torsion spring 150, which is sleeved on the shaft rod 120, and the two ends of the torsion spring 150 are respectively in contact with the shaft seat 110 and the rotating member 130. When the shaft seat 110 and the rotating member 130 rotate relative to each other, the two ends of the torsion spring 150 are subjected to force, driving the torsion spring 150 itself to undergo torsional deformation, thereby applying damping support to the rotating member 130. For example, when the lamp holder rotates toward one side of the lamp holder, the gravity of the lamp holder will be applied to the torsion spring 150, and the torsion spring 150 can support the lamp holder through torsional deformation, thereby preventing the lamp holder from being overly pressed down, which may cause damage to the rotating shaft structure 100.

[0044] Furthermore, if Figures 1 to 3As shown, the side wall of the shaft seat 110 is in frictional contact with the side wall of the rotating member 130 for a long time, which will cause greater wear on the shaft seat 110 and the rotating member 130, and will affect the durability of the shaft structure 100. In order to avoid direct friction between the side wall of the shaft seat 110 and the side wall of the rotating member 130, a friction pad can be arranged between the side wall of the shaft seat 110 and the side wall of the rotating member 130. Specifically, the shaft structure 100 can also include a first friction pad 160 and a second friction pad 170, and the first friction pad 160 and the second friction pad 170 are respectively mounted on the shaft rod 120. Two gaps are formed between the two opposite side walls of the shaft seat 110 and the two opposite side walls of the rotating member 130. The first friction pad 160 and the second friction pad 170 can be respectively arranged in the above-mentioned two gaps. The first friction pad 160 and the second friction pad 170 can be made of materials such as POM (polyformaldehyde) or PA (Polyamide). Since both POM and PA materials have self-lubricating and wear-resistant properties, they can improve the smoothness and durability of the rotation of the shaft seat 110 and the rotating member 130.

[0045] To avoid direct frictional contact between the elastic member 140 and the outer surface of the shaft seat 110, the rotating shaft structure 100 may further include a protective gasket 180, which is sleeved on the shaft 120 and located between the elastic member 140 and the outer surface of the shaft seat 110. The protective gasket 180 may also be made of materials such as POM or PA.

[0046] like Figures 1 to 3 As shown, the second end of the shaft 120 is connected to the side wall of the shaft seat 110, and the shaft structure 100 may further include a fastening nut 190, which is connected to the side wall of the shaft seat 110, and the second end of the shaft 120 is provided with a thread and is threadedly connected to the fastening nut 190. The fastening nut 190 and the shaft seat 110 may be connected by welding, bonding, clamping, etc. When the shaft 120 is installed, the fitting clearance between the shaft seat 110, the rotating member 130 and the elastic member 140 may be adjusted by controlling the screwing length of the shaft 120 and the fastening nut 190, so that the shaft seat 110 and the rotating member 130 can rotate and fit normally.

[0047] like Figures 1 to 3 As shown, the fastening nut 190 can be assembled with the shaft seat 110 by snapping. Specifically, a fixing groove 112 can be set on the outer wall of the shaft seat 110, the fixing groove 112 matches the contour of the fastening nut 190, and the fixing groove 112 is connected to the first axial hole 111. The fastening nut 190 is snapped into the fixing groove 112 to achieve assembly, and the second end of the shaft rod 120 passes through the first axial hole 111 and extends into the fastening nut 190 to achieve threaded connection.

[0048] like Figures 1 to 5 As shown, the rotating member 130 is used to connect with the lamp body part 210 of the lamp 200. For example, the lamp body part 210 is a lamp pole, and the lamp holder part 220 is a lamp holder. In order to facilitate the connection between the rotating member 130 and the lamp pole, a raised connecting portion 132 can be provided on the rotating member 130, and the lamp pole can be sleeved on the connecting portion 132 to achieve installation and fixation; the shaft seat 110 is connected to the lamp holder, and the shaft seat 110 and the lamp holder can also be installed by nesting.

[0049] In addition, in order to improve the reliability of the connection between the rotating member 130 and the lamp body 210, the shaft seat 110 and the lamp holder 220, the rotating member 130 and the lamp body 210, the shaft seat 110 and the lamp holder 220 can be further fixed by adding a bolt mounting structure. The bolt mounting structure may include bolt holes, nuts, etc. The bolt mounting structure is respectively arranged on the rotating member 130, the shaft seat 110, the lamp body 210 and the lamp holder 220. After the rotating member 130, the lamp body 210, the shaft seat 110 and the lamp holder 220 are connected, they are reinforced with bolts, thereby improving the stability and durability of the lamp 200. The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0050] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A lamp, the lamp (200) comprising a lamp body (210), a lamp holder (220) and a rotating shaft structure (100), characterized in that: The rotating shaft structure (100) comprises: a shaft seat (110), a shaft rod (120), a rotating member (130) and an elastic member (140); The shaft seat (110) is provided with a first shaft hole (111) on two opposite side walls, and the shaft seat (110) is provided with a second shaft hole (131) on two opposite side walls of the rotating member (130). The shaft seat (110) is sleeved on the rotating member (130), and the first shaft hole (111) is communicated with the second shaft hole (131). The shaft rod (120) is passed through the first shaft hole (111) and the second shaft hole (131), so that the rotating member (130) and the shaft seat (110) can rotate relative to each other around the axial direction of the shaft rod (120). The rotating member (130) is used to connect the lamp body part (210), and the shaft seat (110) is used to connect the lamp holder part (220). The shaft rod (120) includes a first end and a second end facing each other, the first end protruding from the outer surface of the shaft seat (110), and the first end is provided with a shaft cap (121), the second end is connected to the side wall of the shaft seat (110), and the elastic member (140) is elastically supported between the shaft cap (121) and the outer surface of the shaft seat (110) so that the side wall of the shaft seat (110) fits with the side wall of the rotating member (130).

2. The lamp according to claim 1, characterized in that: The elastic member (140) comprises an elastic shell, the elastic shell is provided with a through hole (143), the elastic shell is sleeved on the shaft (120) through the through hole (143), two opposite side walls of the elastic shell form an elastic buffer space, and the two side walls are respectively in contact with the outer surface of the shaft cap (121) and the shaft seat (110).

3. The lamp according to claim 2, characterized in that: The elastic shell comprises a first disc-shaped elastic sheet (141) and a second disc-shaped elastic sheet (142); the first disc-shaped elastic sheet (141) and the second disc-shaped elastic sheet (142) are buckled together to enclose the elastic buffer space; and the first disc-shaped elastic sheet (141) and the second disc-shaped elastic sheet (142) are respectively provided with the through hole (143).

4. The lamp according to claim 1, characterized in that: The rotating shaft structure (100) further comprises a torsion spring (150), wherein the torsion spring (150) is sleeved on the shaft rod (120), and two ends of the torsion spring (150) are respectively in contact with the shaft seat (110) and the rotating member (130).

5. The lamp according to claim 1, characterized in that: The rotating shaft structure (100) further comprises a first friction pad (160) and a second friction pad (170), wherein the first friction pad (160) and the second friction pad (170) are respectively sleeved on the shaft rod (120) and are respectively located in the gap formed by the shaft seat (110) and the rotating member (130).

6. The lamp according to claim 1, characterized in that: The rotating shaft structure (100) further comprises a protective gasket (180), wherein the protective gasket (180) is sleeved on the shaft rod (120) and is located between the elastic member (140) and the outer surface of the shaft seat (110).

7. The lamp according to claim 1, characterized in that: The rotating shaft structure (100) further comprises a fastening nut (190), wherein the fastening nut (190) is connected to the side wall of the shaft seat (110), and the second end of the shaft rod (120) is threadedly connected to the fastening nut (190).

8. The lamp according to claim 7, characterized in that: The outer side wall of the shaft seat (110) is provided with a fixing groove (112), the fixing groove (112) is communicated with the first shaft hole (111), and the fastening nut (190) is clamped in the fixing groove (112).

9. The lamp according to claim 1, characterized in that: The rotating member (130) is provided with a protruding connecting portion (132), and the connecting portion (132) is used to connect to the lamp body portion (210).

10. The lamp according to claim 1, characterized in that: The shaft seat (110) and the rotating member (130) are both provided with bolt mounting structures, and are respectively bolted to the lamp holder part (220) and the lamp body part (210) via the bolt mounting structures.

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