CN215569199U - Projection equipment for multimedia teaching - Google Patents
Projection equipment for multimedia teaching Download PDFInfo
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- CN215569199U CN215569199U CN202121846827.6U CN202121846827U CN215569199U CN 215569199 U CN215569199 U CN 215569199U CN 202121846827 U CN202121846827 U CN 202121846827U CN 215569199 U CN215569199 U CN 215569199U
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- groove
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- projection device
- fixedly connected
- transverse
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- 239000000725 suspension Substances 0.000 claims abstract description 47
- 238000013016 damping Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 230000007547 defect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a projection device for multimedia teaching, which belongs to the technical field of teaching projection devices and comprises a suspension rod, wherein the lower end of the suspension rod is fixedly connected with a rotary table, the upper end of the rotary table is connected with a plurality of balls in a rolling manner, the rotary table is connected with a connecting sleeve in a rotating manner, the upper end inside the connecting sleeve is provided with an annular groove, the left side of the connecting sleeve is connected with a threaded rod in a rotating manner through threads, a transverse groove and a vertical groove are arranged on a suspension seat, the transverse groove is communicated with the inside of the vertical groove, a transverse plate is fixedly connected with a vertical block, the transverse groove is in sliding clamping connection with the transverse plate, the vertical groove is in sliding clamping connection with the vertical block, the projection device body is conveniently limited and clamped at the lower end of the suspension seat, the rear side of the suspension seat is limited and shielded through a limiting strip, a damping sleeve, a stop block and a pull handle after the transverse plate is fixedly clamped with the vertical block, the transverse groove and the transverse plate and the vertical block are prevented from being clamped and separated from each other, so that the projection device body can be conveniently assembled and disassembled, the defect caused by fixedly connecting the projection equipment body through the bolt is avoided.
Description
Technical Field
The utility model relates to the technical field of teaching projection equipment, in particular to projection equipment for multimedia teaching.
Background
A projector, also called a projector, is a device that can project images or videos onto a curtain, and can be connected with a computer, a VCD, a DVD, a BD, a game machine, a DV, etc. through different interfaces to play corresponding video signals.
At present, most of installation positions of projection equipment for multimedia teaching are fixedly installed at the top of a classroom through bolts, the installation positions are high, the installation difficulty is high, the later-stage disassembly and maintenance are inconvenient, and the projection equipment is not easy to adjust the angle of the projection equipment according to the use requirement after installation, so that much inconvenience is brought to the use.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide a projection device for multimedia teaching, wherein a transverse groove and a vertical groove are arranged on a suspension seat, the transverse groove is communicated with the interior of the vertical groove, a transverse plate is fixedly connected with a vertical block, the transverse groove is in sliding clamping connection with the transverse plate, the vertical groove is in sliding clamping connection with the vertical block, the projection device body is conveniently limited and clamped at the lower end of the suspension seat, the transverse plate is fixedly clamped with the vertical block, the rear side of the suspension seat is limited and shielded through a limiting strip, a damping sleeve, a stop block and a pull handle, the transverse groove, the transverse plate and the vertical groove are prevented from being clamped and disconnected due to instability, the transverse groove, the vertical groove and the vertical block are prevented from being clamped, the projection device body is convenient to assemble and disassemble, the defects caused by fixedly connecting the projection device body through bolts are avoided, meanwhile, the rotary table is arranged at the lower end of a suspension rod, the rotary table is rotatably connected with the connecting sleeve, and the joint is reduced in friction through balls, the convenient projection direction who adjusts the spacing projection equipment body through the carousel rotates in the inside of adapter sleeve, and the direction after the joint through threaded rod and thread groove is fixed to the projection equipment body is adjusted is spacing fixed moreover.
In order to solve the above problems, the present invention adopts the following technical solutions.
A projection device for multimedia teaching comprises a suspension rod, wherein the lower end of the suspension rod is fixedly connected with a rotary table, the upper end of the rotary table is connected with a plurality of balls in a rolling manner, the rotary table is connected with a connecting sleeve in a rotating manner, the inner upper end of the connecting sleeve is provided with a ring groove, the left side of the connecting sleeve is connected with a threaded rod in a rotating manner through threads, the lower end of the connecting sleeve is fixedly connected with a suspension seat, the suspension seat is provided with a transverse groove, the suspension seat is provided with a plurality of vertical grooves, the inner part of the transverse groove is slidably clamped with a transverse plate, the left side and the right side of the lower end of the transverse plate are respectively and fixedly connected with vertical blocks, the lower end of each vertical block is fixedly connected with a projection device body, the rear side of the suspension seat is provided with a groove, the rear side upper end of the suspension seat is provided with a through groove, the inner part of the groove is slidably clamped with a limiting strip, and the outer side of the limiting strip is fixedly wrapped with a damping sleeve, the upper end of the limiting strip is fixedly connected with a stop block, a transverse groove and a vertical groove are arranged through the suspension seat, then the transverse groove is communicated with the interior of the vertical groove, the transverse plate is fixedly connected with the vertical block, the transverse groove is in sliding clamping connection with the transverse plate, the vertical groove is in sliding clamping connection with the vertical block, the projection equipment body is conveniently limited and clamped at the lower end of the suspension seat, the rear side of the suspension seat is limited and shielded through the limiting strip, the damping sleeve, the stop block and the pull handle after the transverse plate is fixedly clamped with the vertical block, the transverse groove, the transverse plate and the vertical groove are prevented from being separated due to unstable clamping connection with the vertical block, the effect of conveniently assembling and disassembling the projection equipment body is achieved, the defects caused by fixedly connecting the projection equipment body through bolts are avoided, meanwhile, the rotary table is arranged at the lower end of the suspension rod and is rotatably connected with the connection sleeve, friction is reduced through balls at the joint, and the projection direction of the limiting projection equipment body is conveniently adjusted through rotation of the rotary table in the interior of the connection sleeve, and finally, the direction of the projection equipment body after being adjusted is limited and fixed through the clamping connection of the threaded rod and the threaded groove.
Further, hang the upper end fixedly connected with mounting disc of pole, ball roll connection is in the inside of ring channel, and the mounting disc passes through bolt fixed mounting on the inside roof in classroom, through the setting of ball, has reduced the resistance that produces when rotating between carousel and the adapter sleeve, makes things convenient for the carousel to rotate.
Further, the carousel is equipped with a plurality of thread grooves, the threaded rod passes the left side of adapter sleeve through the screw rotation and connects in the inside of thread groove, is connected through the rotation of thread groove and threaded rod, and the convenience is spacing being connected of carousel and adapter sleeve to carry out spacing fixed to the projection equipment body.
Further, the inside switch-on in horizontal groove and perpendicular groove, the inside slip joint in vertical block and perpendicular groove through the setting in horizontal groove and perpendicular groove, makes things convenient for the joint of diaphragm and vertical block to through diaphragm and horizontal groove joint, vertical block fixes the projection equipment body with being connected of hanging the seat with the joint in perpendicular groove, thereby reaches the effect of the fixed projection equipment body of installation.
Further, the recess is put through with the inside of leading to the groove, the damping cover is hugged closely with the inside slip of recess, through the setting of damping cover, avoids spacing strip to take place to remove by oneself to carry on spacingly to the dog, make the dog more firm with the inside joint of recess, to diaphragm and cross slot joint, the joint of riser and vertical groove carries out spacing sheltering from respectively.
Further, the upper end fixedly connected with pull handle of dog, the dog slides and passes the inside that leads to the groove, through the setting of pull handle, conveniently makes dog and spacing upward movement through the rebound pull handle, makes things convenient for the joint of diaphragm and cross slot and breaks away from work, and the joint of vertical piece and vertical groove with break away from work.
Furthermore, dog sliding connection is in the inside of recess, the length of spacing strip is greater than the length of dog, can break away from the inside of recess through the dog rebound, nevertheless because the length of spacing strip is greater than the length that leads to the groove, so when the inside upper end of recess is moved to spacing strip rebound, the lower extreme of dog moves the inside that leads to the groove to make the cross slot and erect the groove and leak out.
Compared with the prior art, the utility model has the advantages that:
(1) the projection equipment body is convenient to be connected and disconnected at the lower end of the suspension seat in a limiting manner through the limiting strip, the damping sleeve, the stop block and the pull handle after the transverse plate is fixedly connected with the vertical block in a sliding manner, so that the rear side of the suspension seat is prevented from being blocked in a limiting manner through the limiting strip, the damping sleeve, the stop block and the pull handle, the transverse groove and the transverse plate are prevented from being disconnected due to unstable connection of the vertical groove and the vertical block, the effect of conveniently assembling and disassembling the projection equipment body is achieved, the defects caused by fixedly connecting the projection equipment body through bolts are avoided, meanwhile, the rotary table is arranged at the lower end of the suspension rod and is rotationally connected with the connection sleeve, the friction of the connection part is reduced through the balls, and the projection direction of the limiting projection equipment body is conveniently adjusted through the rotation of the rotary table in the connection sleeve, and finally, the direction of the projection equipment body after being adjusted is limited and fixed through the clamping connection of the threaded rod and the threaded groove.
(2) Hang the upper end fixedly connected with mounting disc of pole, ball roll connection is in the inside of ring channel, and the mounting disc passes through bolt fixed mounting on the inside roof in classroom, through the setting of ball, has reduced the resistance that produces when rotating between carousel and the adapter sleeve, makes things convenient for the carousel to rotate.
(3) The carousel is equipped with a plurality of thread grooves, and the threaded rod passes the left side of adapter sleeve through the screw rotation and connects in the inside of thread groove, is connected through the rotation of thread groove and threaded rod, and the convenience is spacing being connected of carousel and adapter sleeve to carry on spacingly fixedly to the projection equipment body.
(4) The inside switch-on of horizontal groove and perpendicular groove, the inside slip joint in vertical block and perpendicular groove through the setting of horizontal groove and perpendicular groove, makes things convenient for the joint of diaphragm and vertical block to through diaphragm and horizontal groove joint, vertical block is fixed the projection equipment body with being connected that hangs the seat with the joint in perpendicular groove, thereby reaches the effect of the fixed projection equipment body of installation.
(5) The recess switches on with the inside that leads to the groove, and the damping cover is hugged closely with the inside slip of recess, through the setting of damping cover, avoids spacing strip to take place to remove by oneself to carry on spacingly to the dog, make the dog more firm with the inside joint of recess, to diaphragm and cross slot joint, the joint in vertical block and vertical groove carries out spacing sheltering from respectively.
(6) The upper end fixedly connected with pull handle of dog, the dog slides and passes the inside that leads to the groove, through the setting of pull handle, conveniently makes dog and spacing upward movement through the rebound pull handle, makes things convenient for the joint of diaphragm and cross slot and breaks away from work, erects the piece and erects the joint in groove and breaks away from work.
(7) Dog sliding connection is in the inside of recess, and the length of spacing strip is greater than the length of dog, can break away from the inside of recess through the dog rebound, nevertheless because the length of spacing strip is greater than the length that leads to the groove, so when the inside upper end of recess is moved to spacing strip rebound, the lower extreme of dog moves the inside that leads to the groove to make the cross slot leak out with erecting the groove.
Drawings
FIG. 1 is a perspective view of the overall construction of the present invention;
FIG. 2 is a rear partial cross-sectional view of the overall construction of the present invention;
FIG. 3 is an elevational partial cross-sectional view of the overall construction of the utility model;
FIG. 4 is an enlarged top partial cross-sectional view of the connection of the stop bar, stop block and pull handle of the present invention;
FIG. 5 is an enlarged bottom partial cross-sectional view of the adapter sleeve of the present invention;
fig. 6 is an enlarged top cross-sectional view of the turntable of the present invention.
The reference numbers in the figures illustrate:
1 hanging rod, 2 mounting discs, 3 rotating discs, 4 balls, 5 connecting sleeves, 6 annular grooves, 7 threaded rods, 8 threaded grooves, 9 hanging seats, 10 transverse grooves, 101 vertical grooves, 11 transverse plates, 12 vertical blocks, 13 projection equipment bodies, 14 grooves, 15 through grooves, 16 limiting strips, 17 damping sleeves, 18 stop blocks and 19 pull handles.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Referring to fig. 1-6, a projection device for multimedia teaching comprises a suspension rod 1, and referring to fig. 2-3, a rotary table 3 is fixedly connected to the lower end of the suspension rod 1, a plurality of balls 4 are connected to the upper end of the rotary table 3 in a rolling manner, a connecting sleeve 5 is rotatably connected to the rotary table 3, an annular groove 6 is arranged at the inner upper end of the connecting sleeve 5, a threaded rod 7 is rotatably connected to the left side of the connecting sleeve 5 through threads, a suspension base 9 is fixedly connected to the lower end of the connecting sleeve 5, a transverse groove 10 is arranged on the suspension base 9, a plurality of vertical grooves 101 are arranged on the suspension base 9, a transverse plate 11 is slidably clamped in the transverse groove 10, vertical blocks 12 are respectively and fixedly connected to the left side and the right side of the lower end of the transverse plate 11, a projection device body 13 is fixedly connected to the lower end of the vertical blocks 12, a groove 14 is arranged on the rear side of the suspension base 9, a through groove 15 is arranged at the upper end of the rear side of the suspension base 9, a limit strip 16 is slidably clamped in the groove 14, the outer side of the limit strip 16 is fixedly wrapped with a damping sleeve 17, the upper end of the limit strip 16 is fixedly connected with a stop block 18, a transverse groove 10 and a vertical groove 101 are arranged through the suspension seat 9, then the transverse groove 10 is communicated with the interior of the vertical groove 101, the transverse plate 11 is fixedly connected with the vertical block 12, then the transverse groove 10 is in sliding clamping connection with the transverse plate 11, the vertical groove 101 is in sliding clamping connection with the vertical block 12, the projection device body 13 is conveniently in limiting clamping connection with the lower end of the suspension seat 9, and after the transverse plate 11 and the vertical block 12 are fixedly clamped, the rear side of the suspension seat 9 is subjected to limiting shielding through the limit strip 16, the damping sleeve 17, the stop block 18 and a pull handle 19, so that the transverse groove 10 and the transverse plate 11 and the vertical groove 101 are prevented from being disconnected due to unstable clamping connection with the vertical block 12, the effect of conveniently assembling and disassembling the projection device body 13 is achieved, the defects caused by fixedly connecting the projection device body 13 through bolts are avoided, meanwhile, the rotary table 3 is arranged at the lower end of the suspension rod 1, carousel 3 rotates with adapter sleeve 5 to be connected, and the junction reduces the friction through ball 4, conveniently rotates the projection direction who adjusts spacing projection equipment body 13 in the inside of adapter sleeve 5 through carousel 3, and the direction after fixed adjusting projection equipment body 13 is spacing fixed through threaded rod 7 and thread groove 8's joint moreover.
Please refer to fig. 3, the upper end fixedly connected with mounting disc 2 of suspension rod 1, ball 4 roll connection is in the inside of ring channel 6, mounting disc 2 passes through bolt fixed mounting on the inside roof in classroom, through the setting of ball 4, the resistance that produces when having reduced between carousel 3 and the adapter sleeve 5 rotates, make things convenient for carousel 3 to rotate, carousel 3 is equipped with a plurality of thread grooves 8, threaded rod 7 passes the left side of adapter sleeve 5 through the screw rotation and connects in the inside of thread groove 8, be connected through the rotation of thread groove 8 and threaded rod 7, conveniently be connected carousel 3 and adapter sleeve 5 spacing, thereby carry out spacing fixed to projection apparatus body 13.
Please refer to fig. 2 and 4, the inside of the horizontal slot 10 and the vertical slot 101 is connected, the vertical block 12 is connected with the inside of the vertical slot 101 in a sliding manner, the horizontal slot 10 and the vertical slot 101 are arranged to facilitate the connection between the horizontal plate 11 and the vertical block 12, the horizontal plate 11 is connected with the horizontal slot 10 in a clamping manner, the vertical block 12 is connected with the vertical slot 101 to fix the connection between the projection device body 13 and the suspension base 9, thereby achieving the effect of fixing the projection device body 13, the groove 14 is connected with the inside of the through slot 15, the damping sleeve 17 is tightly attached to the inside of the groove 14 in a sliding manner, the arrangement of the damping sleeve 17 prevents the limit strip 16 from moving by itself, thereby limiting the limit block 18, so that the internal clamping between the block 18 and the groove 14 is more stable, the horizontal plate 11 is connected with the horizontal slot 10 in a clamping manner, and the vertical block 12 is respectively blocked in a limiting manner.
Referring to fig. 2 and 4, a pull handle 19 is fixedly connected to an upper end of the stopper 18, the stopper 18 slides through the inside of the through groove 15, the stopper 18 and the stop bar 16 can move upwards by moving the pull handle 19 upwards, the transverse plate 11 and the transverse groove 10 can be conveniently clamped and separated, the vertical block 12 and the vertical groove 101 can be clamped and separated, the stopper 18 is slidably connected to the inside of the groove 14, the length of the stop bar 16 is greater than that of the stopper 18, and the stop bar 18 can be separated from the inside of the groove 14 by moving upwards, but since the length of the stop bar 16 is greater than that of the through groove 15, when the stop bar 16 moves upwards to the upper end of the inside of the groove 14, the lower end of the stopper 18 moves to the inside of the through groove 15, so that the transverse groove 10 and the vertical groove 101 are leaked.
The mounting disc 2 is fixedly mounted at a position needing to be mounted and fixed through a bolt, then the pull handle 19 is moved upwards, the pull handle 19 drives the stop block 18 and the limiting strip 16 to move upwards, when the limiting strip 16 is clamped at the upper end inside the groove 14, the limiting strip 16 is fixed at the upper end inside the groove 14 through the damping sleeve 17, then the projection equipment body 13 can be lifted, the vertical block 12 fixedly connected with the upper end of the projection equipment body 13 is slidably inserted in the vertical groove 101, then the transverse plate 11 is slidably inserted in the transverse groove 10, then the pull handle 19 is moved downwards after clamping is completed, the pull handle 19 pushes the stop block 18 downwards, the limiting strip 16 is reset again, the threaded rod 7 is separated from the connecting sleeve 5 by taking down the threaded rod 7, then the rotary table 3 can be rotated, when the projection equipment body 13 is rotated to a proper position, the threaded rod 7 is connected in the threaded groove 8 through thread rotation again, the projection device is characterized in that a transverse groove 10 and a vertical groove 101 are arranged through a suspension seat 9, then the transverse groove 10 is communicated with the interior of the vertical groove 101, a transverse plate 11 is fixedly connected with a vertical block 12, then the transverse groove 10 is in sliding clamping connection with the transverse plate 11, the vertical groove 101 is in sliding clamping connection with the vertical block 12, the projection device body 13 is conveniently limited and clamped at the lower end of the suspension seat 9, the transverse groove 11 and the vertical block 12 are fixedly clamped and then limited and shielded on the rear side of the suspension seat 9 through a limiting strip 16, a damping sleeve 17, a stop block 18 and a pull handle 19, the transverse groove 10 is prevented from being separated from the transverse plate 11 and the vertical groove 101 and the vertical block 12 in clamping connection with each other, so that the effect of conveniently assembling and disassembling the projection device body 13 is achieved, the defects caused by fixedly connecting the projection device body 13 through bolts are avoided, meanwhile, the rotary table 3 is arranged at the lower end of the suspension rod 1, the rotary table 3 is rotatably connected with the connection sleeve 5, the connection part reduces friction through a ball 4, and the projection direction of the projection device body 13 is conveniently adjusted through the rotation of the rotary table 3 in the connection sleeve 5, and finally, the direction of the projection equipment body 13 after adjustment is limited and fixed through clamping and fixing of the threaded rod 7 and the threaded groove 8.
The foregoing is only a preferred embodiment of the present invention; the scope of the utility model is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (8)
1. A projection device for multimedia teaching, comprising a suspension rod (1), characterized in that: the lower end of the suspension rod (1) is fixedly connected with a rotary table (3), the upper end of the rotary table (3) is connected with a plurality of balls (4) in a rolling manner, the rotary table (3) is connected with a connecting sleeve (5) in a rotating manner, the inner upper end of the connecting sleeve (5) is provided with an annular groove (6), the left side of the connecting sleeve (5) is connected with a threaded rod (7) in a rotating manner through threads, the lower end of the connecting sleeve (5) is fixedly connected with a suspension seat (9), the suspension seat (9) is provided with a transverse groove (10), the suspension seat (9) is provided with a plurality of vertical grooves (101), a transverse plate (11) is slidably clamped in the transverse groove (10), the left side and the right side of the lower end of the transverse plate (11) are respectively and fixedly connected with vertical blocks (12), the lower end of each vertical block (12) is fixedly connected with a projection equipment body (13), and the rear side of the suspension seat (9) is provided with a groove (14), the rear side upper end of hanging seat (9) is equipped with logical groove (15), the inside slip joint of recess (14) has spacing (16), the outside fixed parcel of spacing (16) has damping sleeve (17), the upper end fixedly connected with dog (18) of spacing (16).
2. A projection device for multimedia teaching according to claim 1, wherein: the upper end of the suspension rod (1) is fixedly connected with a mounting disc (2), and the ball (4) is connected to the inside of the annular groove (6) in a rolling manner.
3. A projection device for multimedia teaching according to claim 1, wherein: carousel (3) are equipped with a plurality of thread grooves (8), threaded rod (7) pass the left side of adapter sleeve (5) through the screw rotation and connect in the inside of thread groove (8).
4. A projection device for multimedia teaching according to claim 1, wherein: the transverse groove (10) is communicated with the interior of the vertical groove (101), and the vertical block (12) is clamped with the interior of the vertical groove (101) in a sliding mode.
5. A projection device for multimedia teaching according to claim 1, wherein: the groove (14) is communicated with the inside of the through groove (15), and the damping sleeve (17) is in sliding close contact with the inside of the groove (14).
6. A projection device for multimedia teaching according to claim 1, wherein: the upper end of the stop block (18) is fixedly connected with a pull handle (19), and the stop block (18) penetrates through the through groove (15) in a sliding mode.
7. A projection device for multimedia teaching according to claim 1, wherein: the stop block (18) is connected to the inner part of the groove (14) in a sliding mode, and the length of the limiting strip (16) is larger than that of the stop block (18).
8. A projection device for multimedia teaching according to claim 1, wherein: the rear side upper end of hanging seat (9) is equipped with logical groove (15), the inside slip joint of recess (14) has spacing (16), the outside fixed parcel of spacing (16) has damping sleeve (17), the upper end fixedly connected with dog (18) of spacing (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121846827.6U CN215569199U (en) | 2021-08-09 | 2021-08-09 | Projection equipment for multimedia teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121846827.6U CN215569199U (en) | 2021-08-09 | 2021-08-09 | Projection equipment for multimedia teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215569199U true CN215569199U (en) | 2022-01-18 |
Family
ID=79833755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121846827.6U Expired - Fee Related CN215569199U (en) | 2021-08-09 | 2021-08-09 | Projection equipment for multimedia teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215569199U (en) |
-
2021
- 2021-08-09 CN CN202121846827.6U patent/CN215569199U/en not_active Expired - Fee Related
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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: 20220118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |