CN209213397U - A kind of LED display being easily installed - Google Patents

A kind of LED display being easily installed Download PDF

Info

Publication number
CN209213397U
CN209213397U CN201821789421.7U CN201821789421U CN209213397U CN 209213397 U CN209213397 U CN 209213397U CN 201821789421 U CN201821789421 U CN 201821789421U CN 209213397 U CN209213397 U CN 209213397U
Authority
CN
China
Prior art keywords
support column
led display
column
slideway
main body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201821789421.7U
Other languages
Chinese (zh)
Inventor
吴观荣
张月亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Golden Moon Technology Co Ltd
Original Assignee
Jiangsu Golden Moon Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Golden Moon Technology Co Ltd filed Critical Jiangsu Golden Moon Technology Co Ltd
Priority to CN201821789421.7U priority Critical patent/CN209213397U/en
Application granted granted Critical
Publication of CN209213397U publication Critical patent/CN209213397U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

本实用新型公开了一种便于安装的LED显示屏,包括滑道、第一支撑柱和固定块,所述滑道前后端均设置有第一螺栓,且滑道内设置有滑块,所述第一支撑柱设置在滑块右侧面,且第一支撑柱内设置有第二支撑柱,所述第一支撑柱和第二支撑柱上均开设有插销孔,且第一支撑柱和第二支撑柱通过插销孔和插销固定,所述第二支撑柱右端设置有凸缘,所述固定块设置在凸缘右侧,且固定块左侧面设置有旋转柱,所述旋转柱贯穿通孔,且旋转柱下端设置有螺母,所述固定块侧面上设置有连接柱,且固定块右侧设置有LED显示屏主体。该便于安装的LED显示屏,将LED显示屏主体左侧面通过第三螺栓固定在连接柱上,即可安装LED显示屏主体,达到便于安装LED显示屏主体的目的。

The utility model discloses an easy-to-install LED display screen, which comprises a slideway, a first support column and a fixing block. First bolts are arranged at the front and rear ends of the slideway, and a slide block is arranged inside the slideway. A support column is arranged on the right side of the slider, and a second support column is arranged in the first support column, and a bolt hole is opened on the first support column and the second support column, and the first support column and the second support column The support column is fixed by the bolt hole and the bolt, the right end of the second support column is provided with a flange, the fixed block is arranged on the right side of the flange, and the left side of the fixed block is provided with a rotating column, and the rotating column passes through the through hole , and the lower end of the rotating column is provided with a nut, the side of the fixed block is provided with a connecting column, and the right side of the fixed block is provided with an LED display main body. In the easy-to-install LED display, the left side of the LED display main body is fixed on the connecting column through the third bolt, so that the LED display main body can be installed, and the purpose of facilitating the installation of the LED display main body is achieved.

Description

一种便于安装的LED显示屏An easy-to-install LED display

技术领域technical field

本实用新型涉及LED显示屏技术领域,具体为一种便于安装的LED显示屏。The utility model relates to the technical field of LED display screens, in particular to an LED display screen which is easy to install.

背景技术Background technique

LED显示屏是一种平板显示器,由一个个小的LED模块面板组成,用来显示文字、图像、视频、录像信号等各种信息的设备。The LED display is a flat panel display, which is composed of small LED module panels and is used to display various information such as text, images, videos, and video signals.

现在市场采用传统的LED显示屏,不便于安装,且安装好的LED显示屏不能调节角度和位置。因此,需要一种便于安装的LED显示屏来改善上述问题。Now the market uses traditional LED displays, which are not easy to install, and the installed LED displays cannot adjust the angle and position. Therefore, there is a need for an easy-to-install LED display to improve the above problems.

实用新型内容Utility model content

本实用新型的目的在于提供一种便于安装的LED显示屏,以解决上述背景技术中提出的传统的LED显示屏,不便于安装,且安装好的LED显示屏不能调节角度和位置的问题。The purpose of this utility model is to provide an LED display screen that is easy to install, so as to solve the problem that the traditional LED display screen proposed in the above background technology is not easy to install, and the angle and position of the installed LED display screen cannot be adjusted.

为实现上述目的,本实用新型提供如下技术方案:一种便于安装LED显示屏,包括滑道、第一支撑柱和固定块,所述滑道前后端均设置有第一螺栓,且滑道内设置有滑块,同时滑块通过第二螺栓固定在滑道上,所述第一支撑柱设置在滑块右侧面,且第一支撑柱内设置有第二支撑柱,所述第一支撑柱和第二支撑柱上均开设有插销孔,且第一支撑柱和第二支撑柱通过插销孔和插销固定,所述第二支撑柱右端设置有凸缘,且凸缘上开设有通孔,所述固定块设置在凸缘右侧,且固定块左侧面设置有旋转柱,所述旋转柱贯穿通孔,且旋转柱下端设置有螺母,同时螺母设置在凸缘下方,所述固定块侧面上设置有连接柱,且固定块右侧设置有LED显示屏主体,同时连接柱通过第三螺栓与LED显示屏主体相连接。In order to achieve the above purpose, the utility model provides the following technical solutions: an LED display screen that is easy to install, including a slideway, a first support column and a fixing block, the front and rear ends of the slideway are provided with first bolts, and the slideway is provided with There is a slider, and the slider is fixed on the slideway by a second bolt, the first support column is arranged on the right side of the slider, and a second support column is arranged in the first support column, and the first support column and the The second support columns are provided with bolt holes, and the first support column and the second support column are fixed by the bolt holes and the bolts, the right end of the second support column is provided with a flange, and the flange is provided with a through hole, so The fixed block is arranged on the right side of the flange, and the left side of the fixed block is provided with a rotating column, the rotating column passes through the through hole, and the lower end of the rotating column is provided with a nut, and the nut is arranged under the flange, and the side of the fixed block A connecting column is arranged on the top, and a main body of the LED display is arranged on the right side of the fixing block, and the connecting column is connected with the main body of the LED display through a third bolt.

优选的,所述滑道与滑块之间为卡合连接,且滑道与滑块构成滑动机构。Preferably, the slideway and the slider are in a snap-fit connection, and the slideway and the slider form a sliding mechanism.

优选的,所述滑块与第一支撑柱构成“T”形,且滑块右端面面积大于第一支撑柱左端面面积。Preferably, the slider and the first support column form a "T" shape, and the area of the right end surface of the slider is larger than the area of the left end surface of the first support column.

优选的,所述第一支撑柱和第二支撑柱构成伸缩结构,且第一支撑柱长度小于第二支撑柱长度。Preferably, the first support column and the second support column form a telescopic structure, and the length of the first support column is shorter than the length of the second support column.

优选的,所述旋转柱呈“L”形,且旋转柱长度大于凸缘高度。Preferably, the rotating column is in an "L" shape, and the length of the rotating column is greater than the height of the flange.

优选的,所述连接柱设置有四个,且连接柱关于固定块水平中轴线对称分布。Preferably, there are four connecting columns, and the connecting columns are symmetrically distributed with respect to the horizontal central axis of the fixing block.

与现有技术相比,本实用新型的有益效果是:该便于安装的LED显示屏,Compared with the prior art, the beneficial effect of the utility model is: the LED display screen which is easy to install,

(1)设置有连接柱,将LED显示屏主体左侧面通过第三螺栓固定在连接柱上,即可安装LED显示屏主体,达到便于安装LED显示屏主体的目的;(1) There is a connecting column, and the left side of the main body of the LED display is fixed on the connecting column by the third bolt, so that the main body of the LED display can be installed, so as to facilitate the installation of the main body of the LED display;

(2)设置有第二支撑柱、第一支撑柱、旋转柱和螺母,将第二支撑柱从第一支撑柱内抽出一部分,通过插销固定住第二支撑柱,松开螺母,转动旋转柱,便可调节LED显示屏主体角度,调节完毕后,拧紧螺母,以固定住LED显示屏主体,达到便于调节LED显示屏主体角度的目的;(2) The second supporting column, the first supporting column, the rotating column and the nut are provided. Pull out a part of the second supporting column from the first supporting column, fix the second supporting column by the bolt, loosen the nut, and rotate the rotating column , the angle of the main body of the LED display can be adjusted. After the adjustment is completed, tighten the nut to fix the main body of the LED display, so as to facilitate the adjustment of the angle of the main body of the LED display;

(3)设置有滑道和滑块,在滑道的作用下,移动滑块,从而移动LED显示屏主体位置,随后通过第二螺栓固定住滑块,达到便于调节LED显示屏主体位置的目的。(3) A slideway and a slider are provided. Under the action of the slideway, the slider is moved to move the position of the main body of the LED display, and then the slider is fixed by the second bolt to facilitate the adjustment of the position of the main body of the LED display. .

附图说明Description of drawings

图1为本实用新型主视结构示意图;Fig. 1 is a schematic diagram of the main view structure of the utility model;

图2为本实用新型滑道、滑块、第一支撑柱和第二支撑柱连接结构示意图;Fig. 2 is a schematic diagram of the connection structure of the slideway, the slider, the first support column and the second support column of the present invention;

图3为本实用新型固定块、旋转柱、连接柱和LED显示屏主体连接结构示意图。Fig. 3 is a schematic diagram of the connection structure of the fixed block, the rotating column, the connecting column and the main body of the LED display screen of the present invention.

图中:1、滑道,2、第一螺栓,3、滑块,4、第二螺栓,5、第一支撑柱,6、第二支撑柱,7、插销孔,8、插销,9、凸缘,10、通孔,11、固定块,12、旋转柱,13、螺母,14、连接柱,15、LED显示屏主体,16、第三螺栓。In the figure: 1, slideway, 2, first bolt, 3, slider, 4, second bolt, 5, first support column, 6, second support column, 7, pin hole, 8, latch, 9, Flange, 10, through hole, 11, fixed block, 12, rotating column, 13, nut, 14, connecting column, 15, LED display main body, 16, the third bolt.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

若该文中出现电器元件等,则其均与外界的主控器及220V市电电连接,并且主控器可为计算机等起到控制的常规已知设备,同时若文中出现电机、水泵、输料泵和液压缸等,则其均为现有已知设备。If there are electrical components in this article, they are all connected to the external main controller and 220V mains, and the main controller can be conventional known equipment such as a computer, and if there are motors, water pumps, output Material pump and hydraulic cylinder etc., then it is existing known equipment.

请参阅图1-3,本实用新型提供一种技术方案:一种便于安装的LED显示屏,包括滑道1、第一螺栓2、滑块3、第二螺栓4、第一支撑柱5、第二支撑柱6、插销孔7、插销8、凸缘9、通孔10、固定块11、旋转柱12、螺母13、连接柱14、LED显示屏主体15和第三螺栓16,滑道1前后端均设置有第一螺栓2,且滑道1内设置有滑块3,同时滑块3通过第二螺栓4固定在滑道1上,第一支撑柱5设置在滑块3右侧面,且第一支撑柱5内设置有第二支撑柱6,第一支撑柱5和第二支撑柱6上均开设有插销孔7,且第一支撑柱5和第二支撑柱6通过插销孔7和插销8固定,第二支撑柱6右端设置有凸缘9,且凸缘9上开设有通孔10,固定块11设置在凸缘9右侧,且固定块11左侧面设置有旋转柱12,旋转柱12贯穿通孔10,且旋转柱12下端设置有螺母13,同时螺母13设置在凸缘9下方,固定块11侧面上设置有连接柱14,且固定块11右侧设置有LED显示屏主体15,同时连接柱14通过第三螺栓16与LED显示屏主体15相连接。Please refer to Figures 1-3, the utility model provides a technical solution: an LED display screen that is easy to install, including a slideway 1, a first bolt 2, a slider 3, a second bolt 4, a first support column 5, Second supporting column 6, pin hole 7, pin 8, flange 9, through hole 10, fixed block 11, rotating column 12, nut 13, connecting column 14, LED display main body 15 and third bolt 16, slideway 1 The front and rear ends are provided with first bolts 2, and a slider 3 is arranged in the slideway 1, and the slider 3 is fixed on the slideway 1 by the second bolt 4 at the same time, and the first support column 5 is arranged on the right side of the slider 3 , and the first support column 5 is provided with a second support column 6, the first support column 5 and the second support column 6 are provided with a pin hole 7, and the first support column 5 and the second support column 6 pass through the pin hole 7 and the latch 8 are fixed, the right end of the second support column 6 is provided with a flange 9, and the flange 9 is provided with a through hole 10, the fixed block 11 is arranged on the right side of the flange 9, and the left side of the fixed block 11 is provided with a rotating The column 12, the rotating column 12 runs through the through hole 10, and the lower end of the rotating column 12 is provided with a nut 13, and the nut 13 is arranged below the flange 9, the side of the fixed block 11 is provided with a connecting column 14, and the right side of the fixed block 11 is provided with a The LED display main body 15 and the connecting column 14 are connected with the LED display main body 15 through the third bolt 16 at the same time.

本例的滑道1与滑块3之间为卡合连接,且滑道1与滑块3构成滑动机构,在滑道1的作用下,移动滑块3,从而移动LED显示屏主体15的位置,达到便于调节LED显示屏主体15位置的目的。In this example, the slideway 1 and the slider 3 are engaged and connected, and the slideway 1 and the slider 3 constitute a sliding mechanism. position, to achieve the purpose of facilitating the adjustment of the position of the LED display main body 15.

滑块3与第一支撑柱5构成“T”形,且滑块3右端面面积大于第一支撑柱5左端面面积,使LED显示屏主体15在安装时屏幕平行于墙体。The slider 3 and the first support column 5 form a "T" shape, and the area of the right end surface of the slider 3 is larger than the area of the left end surface of the first support column 5, so that the screen of the LED display main body 15 is parallel to the wall when installed.

第一支撑柱5和第二支撑柱6构成伸缩结构,且第一支撑柱5长度小于第二支撑柱6长度,将第二支撑柱6从第一支撑柱5内抽出一部分,一方面可调节LED显示屏主体15的位置,另一方面使LED显示屏主体15不会与墙体相接处。The first support column 5 and the second support column 6 form a telescopic structure, and the length of the first support column 5 is less than the length of the second support column 6, and the second support column 6 is extracted from the first support column 5, which can be adjusted on the one hand. The position of the LED display main body 15, on the other hand, prevents the LED display main body 15 from joining the wall.

旋转柱12呈“L”形,且旋转柱12长度大于凸缘9高度,转动旋转柱12,以便于调节LED显示屏主体15角度。The rotating column 12 is "L" shaped, and the length of the rotating column 12 is greater than the height of the flange 9, and the rotating column 12 is rotated so as to adjust the angle of the main body 15 of the LED display screen.

连接柱14设置有四个,且连接柱14关于固定块11水平中轴线对称分布,通过第三螺栓16将LED显示屏主体15固定在连接柱14上,达到便于安装的目的。There are four connecting columns 14, and the connecting columns 14 are symmetrically distributed about the horizontal central axis of the fixing block 11, and the LED display main body 15 is fixed on the connecting columns 14 by the third bolt 16, so as to achieve the purpose of easy installation.

工作原理:在使用该便于安装的LED显示屏时,通过第一螺栓2将滑道1固定在墙体上,随后通过第三螺栓16将LED显示屏主体15固定在连接柱14上,再将固定块11上的旋转柱12插入凸缘9内的通孔10中,拧紧螺母13,即可安装LED显示屏主体15,达到便于安装的目的,松开第二螺栓4,在滑道1的作用下,移动滑块3,从而移动LED显示屏主体15的位置,调节完毕后,再拧紧第二螺栓4,通过挤压固定住滑块3,达到便于调节LED显示屏主体15位置的目的,将第二支撑柱6从第一支撑柱5内抽出一部分,再通过插销8固定住第二支撑柱6,再将螺母13松开,转动旋转柱12,以调节LED显示屏主体15角度,调节完毕后,拧紧螺母13即可,达到便于调节LED显示屏主体15角度的目的,本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。Working principle: When using this easy-to-install LED display, fix the slideway 1 on the wall through the first bolt 2, then fix the main body 15 of the LED display on the connecting column 14 through the third bolt 16, and then attach the The rotating column 12 on the fixed block 11 is inserted into the through hole 10 in the flange 9, and the nut 13 is tightened to install the LED display main body 15 to achieve the purpose of easy installation. Under the action, the slider 3 is moved, thereby moving the position of the main body 15 of the LED display screen. After the adjustment is completed, the second bolt 4 is tightened, and the slider 3 is fixed by squeezing, so as to facilitate the adjustment of the position of the main body 15 of the LED display screen. Pull out a part of the second support column 6 from the first support column 5, and then fix the second support column 6 through the latch 8, then loosen the nut 13, and rotate the rotating column 12 to adjust the angle of the main body 15 of the LED display screen. After completion, just tighten the nut 13 to achieve the purpose of conveniently adjusting the angle of the main body 15 of the LED display screen. The content not described in detail in this manual belongs to the prior art known to those skilled in the art.

术语“中心”、“纵向”、“横向”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为便于描述本实用新型的简化描述,而不是指示或暗指所指的装置或元件必须具有特定的方位、为特定的方位构造和操作,因而不能理解为对本实用新型保护内容的限制。The terms "center", "portrait", "landscape", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the simplified description of the present utility model, rather than indicating or implying that the referred device or element must have a specific Orientation is a specific orientation structure and operation, so it cannot be understood as a limitation on the protection content of the present utility model.

尽管参照前述实施例对本实用新型进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,凡在本实用新型的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本实用新型的保护范围之内。Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art can modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features. Within the spirit and principles of the utility model, any modification, equivalent replacement, improvement, etc., should be included in the protection scope of the utility model.

Claims (6)

1. a kind of LED display being easily installed, including slideway (1), the first support column (5) and fixed block (11), feature exists In: slideway (1) front and back end is provided with the first bolt (2), and is provided with sliding block (3) in slideway (1), while sliding block (3) It being fixed on slideway (1) by the second bolt (4), first support column (5) setting is in sliding block (3) right side, and first It is provided with the second support column (6) in dagger (5), offers pin hole on first support column (5) and the second support column (6) (7), and the first support column (5) and the second support column (6) are fixed by pin hole (7) and bolt (8), second support column (6) right end is provided with flange (9), and through-hole (10) are offered on flange (9), and fixed block (11) setting is on flange (9) right side Side, and fixed block (11) left side is provided with column spinner (12), the column spinner (12) runs through through-hole (10), and column spinner (12) Lower end is provided with nut (13), while nut (13) setting company of being provided on flange (9) lower section, fixed block (11) side It connects column (14), and is provided with LED display main body (15) on the right side of fixed block (11), while connecting column (14) passes through third bolt (16) it is connected with LED display main body (15).
2. a kind of LED display being easily installed according to claim 1, it is characterised in that: the slideway (1) and sliding block (3) to be connected together between, and slideway (1) and sliding block (3) constitute sliding equipment.
3. a kind of LED display being easily installed according to claim 1, it is characterised in that: the sliding block (3) and first Support column (5) composition is "T"-shaped, and sliding block (3) right side area is greater than the first support column (5) left side area.
4. a kind of LED display being easily installed according to claim 1, it is characterised in that: first support column (5) Stretching structure is constituted with the second support column (6), and the first support column (5) length is less than the second support column (6) length.
5. a kind of LED display being easily installed according to claim 1, it is characterised in that: the column spinner (12) is in L shape, and column spinner (12) length is greater than flange (9) height.
6. a kind of LED display being easily installed according to claim 1, it is characterised in that: the connecting column (14) sets There are four setting, and connecting column (14) is symmetrical about fixed block (11) horizontal median axis.
CN201821789421.7U 2018-10-31 2018-10-31 A kind of LED display being easily installed Expired - Fee Related CN209213397U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821789421.7U CN209213397U (en) 2018-10-31 2018-10-31 A kind of LED display being easily installed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821789421.7U CN209213397U (en) 2018-10-31 2018-10-31 A kind of LED display being easily installed

Publications (1)

Publication Number Publication Date
CN209213397U true CN209213397U (en) 2019-08-06

Family

ID=67457844

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821789421.7U Expired - Fee Related CN209213397U (en) 2018-10-31 2018-10-31 A kind of LED display being easily installed

Country Status (1)

Country Link
CN (1) CN209213397U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113053176A (en) * 2021-03-17 2021-06-29 牡丹江师范学院 Experimental apparatus for informatization teaching convenient to display screen adjusts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113053176A (en) * 2021-03-17 2021-06-29 牡丹江师范学院 Experimental apparatus for informatization teaching convenient to display screen adjusts

Similar Documents

Publication Publication Date Title
CN207991730U (en) The stress detection device of steel construction
CN209213397U (en) A kind of LED display being easily installed
CN206274429U (en) A kind of computer multimedia teaching device
CN207687600U (en) Outdoor mosaic screen connection component
CN212107786U (en) A hanging full-color display that can be displayed in multiple directions
CN209248984U (en) It is a kind of to be easily installed fixed LED display
CN208058338U (en) A liquid crystal display screen with adjustable angle
CN207584334U (en) A kind of liquid crystal screen fixing device
CN219734918U (en) a guide rail device
CN211352716U (en) Novel court screen die-casting aluminum box structure of LED display screen
CN209705640U (en) A device for adjusting the angle of an LED display screen
CN214253700U (en) Case propaganda electronic information screen
CN208085358U (en) A kind of flexible suspending formula wall fitting picture fixing device
CN221684073U (en) Splicing frame for liquid crystal splicing screen
CN220102632U (en) Anti-interference liquid crystal spliced screen
CN208689873U (en) Liquid crystal splicing screen
CN216927848U (en) An educational display device with multi-angle adjustment
CN219329717U (en) Grid battery photovoltaic board support frame with adjustable height
CN218720397U (en) Detachable liquid crystal splicing screen
CN204829193U (en) LCD TV stores pylon
CN221075885U (en) Micro-spacing LED display screen seam precise adjustment structure
CN217880791U (en) Advertisement display rack
CN110401405A (en) Cab solar panels
CN217690406U (en) A matching component of an LED display
CN211344528U (en) An electronic marketing display display

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190806

CF01 Termination of patent right due to non-payment of annual fee