In-hole grinding machine for resin buttons

By designing structures such as grooves, sliders, and threaded rods, the position and angle of the grinding machine inside the resin button hole can be adjusted, solving the problem of limited applicability in existing technologies and improving grinding quality and equipment stability.

CN223802192UActive Publication Date: 2026-01-16DINGXING HABERDASHERY CO
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Patent Information

Application Number
CN202520403469.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-10
Publication Date
2026-01-16
Estimated Expiration
2035-03-10

AI Technical Summary

Technical Problem

Existing resin button hole polishing machines cannot adapt to different types and sizes of buttons, thus limiting their applicability.

Method used

A structure including a chute, a slider, a placement block, a threaded rod, and a clamping plate is designed. The horizontal movement and rotation of the placement block are realized through the cooperation of the chute and the slider. Combined with the telescopic rod and the fixed column, the position and angle of the grinder can be adjusted. A cleaning mechanism is also provided to collect grinding residue.

Benefits of technology

It enables flexible sanding of resin buttons of different shapes and sizes, improves the consistency of sanding quality, maintains a clean working environment, reduces the risk of equipment failure, and extends service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of resin button polishing, and discloses an in-hole polishing machine for resin buttons, which comprises a base, a sliding groove is arranged in the middle of the top end of the base, a sliding block is slidably connected to the inner wall of the sliding groove, and a placing block is rotatably connected to the top of the sliding block. Threaded rods are rotatably connected to the periphery of the inner wall of the placement block, a rotating valve is fixedly connected to the front end of the outer wall of the threaded rod on the front side, bevel gears are fixedly connected to the outer walls of the multiple threaded rods, rotating teeth are rotatably connected to the top of the inner wall of the placement block, and movable rods are in threaded connection to the outer sides of the multiple threaded rods; one end of each movable rod is fixedly connected with a clamping plate. According to the button polishing device, the front side threaded rod is driven through the rotating valve, synchronous rotation of the multiple threaded rods is achieved through meshing transmission of the bevel gear and the rotating teeth, the clamping plates move towards the center to clamp a button, and it is guaranteed that the button is stable and does not move during polishing.
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Description

TECHNICAL FIELD

[0001] The utility model relates to resin button polishing technical field, especially a kind of hole in resin button polisher. BACKGROUND

[0002] Traditional resin button hole polishing method, more using artificial handheld polishing tool to operate, this way not only inefficient, and polishing quality is difficult to guarantee consistency, so need to use a kind of hole in resin button polisher.

[0003] Through the retrieval, China patent publication No. CN222037827U, a kind of hole in resin button polisher, the utility model includes base, the base upper end is fixedly connected with electric slide, electric slide is slidably connected with electric slide arm, electric slide arm is slidably connected with slide base, slide base bottom is fixedly connected with driving piece, driving piece output end is fixedly connected with driving gear, driving piece end portion is fixedly connected with connecting rod, connecting rod end portion is fixedly connected with mounting plate, mounting plate is rotatably connected with multiple sets of polishing gear, multiple sets of polishing gear are all meshing transmission with driving gear, and multiple sets of polishing gear lower end are all fixedly connected with polishing rod;Through electric slide and electric slide arm drive driving piece to adjust height and position, driving piece drives driving gear to make multiple sets of polishing gear rotate, multiple sets of polishing rod polish the hole in the middle of button, and can change polishing rod quantity according to hole quantity, improve resin button hole inner wall smoothness, prevent resin button easy to fall off, but polisher can only fixedly polish, when facing complex and changeable button polishing, it cannot adapt to different kinds and different specifications of button, thereby limit the application range of polisher. UTILITY MODEL CONTENTS

[0004] In order to make up for the above shortcomings, the utility model provides a kind of hole in resin button polisher, aims at improving the problem that polisher in prior art can only fixedly polish, when facing complex and changeable button polishing, it cannot adapt to different kinds and different specifications of button, thereby limit the application range of polisher.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of hole polishing machine for resin button, including base, the top middle part of the base is equipped with sliding slot, the inner wall of the sliding slot is slidably connected with sliding block, the top of the sliding block is rotatably connected with placing block, the inner wall of the placing block is rotatably connected with threaded rod around, the outer wall front end of front threaded rod is fixedly connected with rotating valve, the outer wall of multiple threaded rods is fixedly connected with bevel gear, the inner wall top of the placing block is rotatably connected with rotating tooth, the outer side of multiple threaded rods is threadedly connected with movable rod, one end of multiple movable rods is fixedly connected with clamping plate, the top rear side of the base is fixedly connected with fixed column, the outer wall of two fixed columns is slidably connected with sliding block, the adjacent side of two sliding blocks is fixedly connected with connecting column, the adjacent end of two connecting columns is fixedly connected with polishing machine one, the top rear end of the base is fixedly connected with multiple telescopic rods, the output end of multiple telescopic rods is fixedly connected with the bottom of two sliding blocks, the outer wall top of two connecting columns is provided with cleaning mechanism.

[0006] Through the above technical scheme: through the sliding slot of the top middle part of base cooperation sliding block, so that placing block can move horizontally and can rotate, it is convenient for adjusting button position, the meshing of multiple threaded rods in placing block with rotating tooth is realized synchronous rotation through bevel gear, and then clamping plate is driven to firmly clamp resin button, and in the movement of polishing machine, the sliding block is slidably connected on the fixed column of base rear side, the sliding block is connected with polishing machine one through connecting column, and the output end of telescopic rod is fixed with the bottom of sliding block, the telescopic action of telescopic rod can control the up-and-down sliding of sliding block, to drive polishing machine one to move to suitable polishing position.

[0007] As further description of the above technical scheme:

[0008] The cleaning mechanism includes two collecting boxes, the bottom of two collecting boxes is communicated with the top of corresponding connecting column respectively, the inner wall top of two collecting boxes is fixedly connected with motor, the output end of two motors is fixedly connected with rotating fan, the inner wall middle part of two collecting boxes is fixedly connected with dust screen, the bottom of two collecting boxes is communicated with connecting pipe, and the bottom of two connecting pipes is fixedly connected with suction head.

[0009] Through the above technical scheme: motor and rotating fan in the inner wall top of collecting box are power source, motor drives rotating fan to rotate, so that negative pressure is generated in collecting box, and dust screen in inner wall middle part is important protection component, can effectively filter dust, prevent large particle impurities from damaging equipment, and guarantee the stable operation of cleaning mechanism, connecting pipe and suction head are the part that directly acts on cleaning area, suction head is close to the place to be cleaned, under the action of negative pressure, dust and sundries are sucked into collecting box through connecting pipe.

[0010] As a further description of the above technical solution:

[0011] The bottom of the base is provided with support columns around the periphery, and the bottom ends of the plurality of support columns are fixedly connected with foot pads.

[0012] Through the above technical solution: through the combination of support columns and foot pads, the stable placement of the equipment is realized, the support columns are evenly distributed around the bottom of the base, providing a solid support foundation for the equipment, and reasonably conducting the gravity to the ground, ensuring that the equipment will not sink or tilt during the working process due to its own weight.

[0013] As a further description of the above technical solution:

[0014] The bottom of the base is provided with mounting holes around the periphery, and the inner walls of the plurality of mounting holes are fixedly connected with the outer top of the corresponding support columns.

[0015] Through the above technical solution: by providing mounting holes around the bottom of the base and fixedly connecting the top ends of the support columns, the layout of the mounting holes can make the support columns evenly share the weight of the equipment.

[0016] As a further description of the above technical solution:

[0017] The bottom of the adjacent side of the two fixed columns is fixedly connected with a protection box, and the top of the two protection boxes is fixedly connected with the bottom end of the corresponding telescopic rod.

[0018] Through the above technical solution: by providing a protection box on the outer wall of the telescopic rod and tightly connecting the protection box with the sliding block, effective protection of the telescopic rod is realized. During the working process of the sander, the protection box can keep the relative position unchanged with the telescopic rod at all times, continuously providing protection for the telescopic rod.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the two protection boxes is fixedly connected with a connecting piece one on the front and back sides, and the bottom end of the plurality of connecting pieces one is threadedly connected with the top rear end of the base on the left and right sides.

[0021] Through the above technical solution: by providing a connecting piece one on the front and back sides of the outer wall of the protection box and threadedly connecting it with the base, the stable fixation of the protection box is realized. The thread connection of the connecting piece one with the base effectively enhances the stability of the protection box. During the working process of the sander, the protection box will be subjected to various external forces.

[0022] As a further description of the above technical solution:

[0023] The outer wall right top of the fixing column is fixedly connected with a controller, and the controller is electrically connected with the motor and the polisher.

[0024] The controller is installed on the sliding block, so that the operator can touch the controller at any time during the operation of the equipment, the controller is electrically connected with the motor and the polisher body, and the controller can accurately send control instructions to the motor and the polisher body.

[0025] Further description is made to the technical scheme:

[0026] The outer wall right end rear side of the placement block is fixedly connected with a blocking rod, the top end middle left side of the base is fixedly connected with a limiting rod two, the inner wall of the blocking rod is clamped with the outer wall of the limiting rod two, the inner wall of the placement block is slidably connected with a limiting rod one around, and a plurality of clamping plates are slidably connected with the outer side of the corresponding limiting rod one.

[0027] When the motor completes the polishing work on the left resin button, the position of the placement block needs to be adjusted for polishing other buttons, the worker manually rotates the placement block, in the rotating process, the blocking rod at the right end rear side of the placement block gradually approaches the limiting rod two, when being rotated to the appropriate position, the inner wall of the blocking rod is clamped with the outer wall of the limiting rod two, and the limiting rod two is used for preventing the clamping plate from rotating with the threaded rod.

[0028] The utility model has the advantages of the following beneficial effects:

[0029] 1、The utility model discloses a telescopic rod is used for controlling the lifting of polisher, can accurately adjust the polishing position, ensures the polishing effect, in position and angle adjustment aspect, the sliding block and the sliding slot, the rotationally connected placement block respectively provide the convenient way for button position and angle adjustment, make the polishing process more flexible, can adapt to different shape and size's resin button.

[0030] 2、The utility model discloses a collection box is close to the polishing source, can collect in the first time of residue production, the motor drives the rotation fan high -speed rotation, forms the negative pressure, utilizes the principle of air flow, and the residue that polishes in the placement block is quickly inhaled, and the residue is collected in time, avoids the scattering everywhere, not only keeps the neat of working environment, also reduces the damage of residue to the internal parts of polisher, reduces the equipment failure risk, prolongs the service life of equipment, guarantees the continuous and efficient of polishing work. ACCURACY

[0031] Figure 1 A perspective view of a hole polisher for resin button is provided for the utility model;

[0032] Figure 2A front view of a hole polishing machine for resin button is provided in the utility model;

[0033] Figure 3 A local structure display drawing of the hole polishing machine for resin button is provided in the utility model;

[0034] Figure 4 A plan view of the hole polishing machine for resin button is provided in the utility model;

[0035] Figure 5 For Figure 4 The enlarged view of A in the utility model is provided in the utility model;

[0036] Figure 6 A local structure split drawing of the hole polishing machine for resin button is provided in the utility model.

[0037] Legend:

[0038] 1, base, 2, cleaning mechanism, 201, collection box, 202, motor, 203, rotating fan, 204, connecting pipe, 205, suction head, 206, dust screen, 3, sliding groove, 4, sliding block, 5, placing block, 6, threaded rod, 7, clamping plate, 8, blocking rod, 9, limiting rod two, 10, fixed column, 11, sliding block, 12, connecting column, 13, polishing machine one, 14, telescopic rod, 15, support column, 16, foot pad, 17, mounting hole, 18, protection box, 19, connecting piece one, 20, controller, 21, rotating valve, 22, bevel gear, 23, rotating tooth, 24, movable rod, 25, limiting rod one. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0040] Referring to Figure 1 , Figure 2 and Figure 6The utility model provides an embodiment: a kind of hole polishing machine for resin button, including base 1, the top middle part of base 1 is equipped with sliding slot 3, the inner wall sliding connection of sliding slot 3 has sliding block 4, the top of sliding block 4 is rotatably connected with placing block 5, the inner wall four quarters of placing block 5 are rotatably connected with threaded rod 6, the outer wall front end of front threaded rod 6 is fixedly connected with rotating valve 21, the outer wall of multiple threaded rods 6 is fixedly connected with bevel gear 22, the inner wall top of placing block 5 is rotatably connected with rotating tooth 23, the outer side of multiple threaded rods 6 is threadedly connected with movable rod 24, one end of multiple movable rods 24 is fixedly connected with clamping plate 7, the top rear side of base 1 left and right end is fixedly connected with fixed column 10, the outer wall of two fixed columns 10 is slidably connected with sliding block 11, the adjacent side of two sliding blocks 11 is fixedly connected with connecting column 12, the adjacent end of two connecting columns 12 is fixedly connected with polisher one 13, the top rear end of base 1 left and right side is fixedly connected with multiple telescopic rods 14, the output of multiple telescopic rods 14 is fixedly connected with the bottom of two sliding blocks 11, and the outer wall top of two connecting columns 12 is provided with cleaning mechanism 2;

[0041] Specifically, base 1 plays a supporting role, and the sliding slot 3 in the middle of the top of base 1 cooperates with the sliding block 4, so that the sliding block 4 can slide along the sliding slot 3, thereby adjusting the position of the placing block 5. The placing block 5 is rotatably connected at the top, which facilitates angle adjustment when the button is placed. The threaded rods 6 around the inner wall of the placing block 5 are rotated by the rotating valve 21 at the front end of the front threaded rod 6, which drives the bevel gears 22 on the outer wall to rotate, thereby causing the rotating tooth 23 to rotate, achieving synchronous rotation of the multiple threaded rods 6. When the threaded rods 6 rotate, the movable rods 24 threadedly connected to the outer side of the threaded rods 6 will move axially along the threaded rods 6. The clamping plates 7 at one end of the multiple movable rods 24 can clamp and fix the button, facilitating polishing operation. The fixed columns 10 on the top rear side of base 1 are used to support the sliding blocks 11, allowing them to slide up and down. The connecting columns 12 connect the sliding blocks 11 with the polisher one 13. The multiple telescopic rods 14 control the lifting of the sliding blocks 11, causing the polisher one 13 to move closer to or further away from the button, thereby achieving polishing inside the button hole.

[0042] Referring to Figure 2 , Figure 3 and Figure 4 , the cleaning mechanism 2 includes two collection boxes 201, the bottom of each collection box 201 is fixedly connected to the outer wall top of each polisher one 13, the inner wall top of each collection box 201 is fixedly connected with a motor 202, the output of each motor 202 is fixedly connected with a rotating fan 203, the bottom of each collection box 201 is connected with a connecting pipe 204, and the other end of each connecting pipe 204 is fixedly connected with a suction head 205.

[0043] Specifically, the collecting box 201 is fixed on the top of the grinding machine 13, close to the source of residue generation. After the motor 202 is started, the rotating fan 203 is driven to rotate at high speed. The negative pressure is formed in the collecting box 201 by the centrifugal force. Based on the negative pressure principle, the suction head 205 is connected to the collecting box 201 through the connecting pipe 204, and the residue generated in the placing block 5 during grinding is sucked into the collecting box 201. The inner wall of the collecting box 201 is fixedly connected with a dust screen 206. The dust screen 206 is used to block the debris and prevent the debris from damaging the rotating fan 203. During the grinding process of the resin button by the grinding machine, the cleaning mechanism 2 is synchronously operated with the working of the grinding machine 13. The motor 202 continuously drives the rotating fan 203 to maintain the negative pressure state in the collecting box 201. The suction head 205 continuously sucks the residue generated during grinding into the collecting box 201.

[0044] With reference to Figure 1 , Figure 2 and Figure 3 , the bottom of the base 1 is provided with a plurality of support columns 15. The bottom ends of the plurality of support columns 15 are fixedly connected with a plurality of foot pads 16. The bottom of the base 1 is provided with a plurality of mounting holes 17. The inner walls of the plurality of mounting holes 17 are respectively fixedly connected with the outer top sides of the corresponding support columns 15. The bottom of the adjacent side of each of the two fixed columns 10 is fixedly connected with a protection box 18. The top of each of the two protection boxes 18 is fixedly connected with the bottom end of the corresponding telescopic rod 14.

[0045] Specifically, the support column 15 and the foot pad 16 form a stable support foundation to ensure that the equipment is stably placed. The connection of the mounting hole 17 and the support column 15 strengthens the firmness of the support structure. The protection of the telescopic rod 14 by the protection box 18 ensures the normal work of the telescopic rod 14. When working, the support column 15 and the foot pad 16 support the grinding machine. The mounting hole 17 ensures the stable connection of the support column 15 and the base 1. The protection box 18 prevents the telescopic rod 14 from being damaged.

[0046] With reference to Figure 2 , Figure 4 and Figure 5 , the outer walls of the two protection boxes 18 are fixedly connected with a plurality of connecting plates 19 on the front and rear sides. The bottom ends of the plurality of connecting plates 19 are respectively threadedly connected with the top rear end and the left and right sides of the base 1. The outer wall of the right side of the right fixed column 10 is fixedly connected with a controller 20 on the right side of the top. The controller 20 is electrically connected with the motor 202 and the grinding machine 13. The outer wall of the right end of the rear side of the placing block 5 is fixedly connected with a blocking rod 8. The top end of the base 1 is fixedly connected with a limiting rod 9 on the left side of the middle. The inner wall of the blocking rod 8 is engaged with the outer wall of the limiting rod 9. The inner wall of the placing block 5 is slidably connected with a plurality of limiting rods 25 on the periphery. The plurality of clamping plates 7 are respectively slidably connected with the outer sides of the corresponding limiting rods 25.

[0047] Specifically, two protective boxes 18 are connected to the top of the base 1 through the front and rear side connecting pieces 19 on the outer wall, which facilitates installation and maintenance. The controller 20 on the top of the right side fixed column 10 is electrically connected to the motor 202 and the grinder 13 to achieve precise control and efficient operation. The blocking rod 8 is fixed to the right end of the outer wall of the placement block 5, and the limiting rod 9 is fixed to the left side of the top of the base 1. The blocking rod 8 and the limiting rod 9 work together to adjust the position of the placement block 5 when different resin buttons need to be polished. The limiting rod 1 is used to prevent the clamping plate 7 from rotating with the threaded rod 6.

[0048] Working principle: By placing the resin button on the placement block 5, rotating the rotating valve 21 on the outer wall of the front threaded rod 6, the threaded rod 6 is rotated, the conical gear 22 on the outer wall is rotated, and the rotating teeth 23 on the inner wall of the placement block 5 are driven to rotate, so that the multiple threaded rods 6 are synchronized. When the threaded rod 6 rotates, the movable rod 24 connected to the outside is moved along the axis, and the clamping plate 7 at one end is clamped and fixed. Then, the multiple telescopic rods 14 are started, and the output end pushes the two sliding blocks 11 up and down along the fixed column 10. The connecting column 12 drives the grinder 13 to approach the button. At this time, the grinder 13 starts to work and polishes the button hole. If the position of the button needs to be adjusted, the sliding block 4 is slid in the sliding groove 3 to drive the placement block 5 to move. If the angle of the button needs to be adjusted, the placement block 5 can be rotated to complete the polishing work of the resin button hole.

[0049] Moreover, when the grinder 13 starts to polish the resin button, the cleaning mechanism 2 is also started. The collection box 201 is fixed on the top of the outer wall of the grinder 13 and closely approaches the polishing source. The motor 202 installed on the inner wall of the collection box 201 is energized to convert electrical energy into mechanical energy, drive the rotating fan 203 connected to the output end to rotate at high speed, and the high-speed rotation of the rotating fan 203 makes the air in the collection box 201 flow rapidly, forming a negative pressure environment. The bottom of the collection box 201 is connected to the suction head 205 through the connecting pipe 204, and under the action of negative pressure, external air is sucked from the suction head 205. The inner wall of the collection box 201 is fixedly connected with the dust screen 206, which is used to block the debris and prevent the debris from damaging the rotating fan 203. The residues generated in the placement block 5 are also wrapped in the airflow and enter the collection box 201 through the connecting pipe 204 along with the air, thereby realizing the timely collection of polishing residues and avoiding the scattering of residues.

[0050] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, the made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A hole-inside polisher for resin button, comprising a base (1), characterized in that: The top middle of the base (1) is provided with a sliding groove (3), the inner wall of the sliding groove (3) is slidably connected with a sliding block (4), the top of the sliding block (4) is rotatably connected with a placing block (5), the inner wall of the placing block (5) is rotatably connected with a threaded rod (6) around, the outer wall front end of the threaded rod (6) is fixedly connected with a rotating valve (21), a plurality of threaded rods (6) are fixedly connected with a bevel gear (22) on the outer wall, the inner wall top of the placing block (5) is rotatably connected with a rotating tooth (23), a plurality of threaded rods (6) are threadedly connected with a movable rod (24) on the outer side, one end of a plurality of movable rods (24) is fixedly connected with a clamping plate (7), the top rear side of the base (1) is fixedly connected with a fixed column (10) on the left and right sides, the outer wall of the two fixed columns (10) is slidably connected with a sliding block (11), the adjacent side of the two sliding blocks (11) is fixedly connected with a connecting column (12), the adjacent end of the two connecting columns (12) is fixedly connected with a grinding machine (13), the top rear end of the base (1) is fixedly connected with a plurality of telescopic rods (14) on the left and right sides, the output end of a plurality of telescopic rods (14) is fixedly connected with the bottom of the two sliding blocks (11), the outer wall top of the two connecting columns (12) is provided with a cleaning mechanism (2).

2. An in-hole sander for resin buttons according to claim 1, characterized in that: The cleaning mechanism (2) comprises two collecting boxes (201), the bottom of the two collecting boxes (201) is respectively connected with the top of the corresponding connecting column (12), the inner wall top of the two collecting boxes (201) is fixedly connected with a motor (202), the output end of the two motors (202) is fixedly connected with a rotating fan (203), the inner wall middle of the two collecting boxes (201) is fixedly connected with a dust screen (206), the bottom of the two collecting boxes (201) is connected with a connecting pipe (204), the bottom of the two connecting pipes (204) is fixedly connected with a suction head (205).

3. An in-hole sander for resin buttons according to claim 1, characterized in that: The bottom of the base (1) is provided with a support column (15) around, the bottom of a plurality of support columns (15) is fixedly connected with a foot pad (16).

4. An in-hole sander for resin buttons according to claim 3, characterized in that: The bottom of the base (1) is provided with a mounting hole (17) around, the inner wall of a plurality of mounting holes (17) is respectively fixedly connected with the top of the corresponding support column (15) on the outer side.

5. An in-hole sander for resin buttons according to claim 1, characterized in that: The bottom of the adjacent side of the two fixed columns (10) is fixedly connected with a protection box (18), the top of the two protection boxes (18) is respectively fixedly connected with the bottom end of the corresponding telescopic rod (14).

6. An in-hole sander for resin buttons according to claim 5, characterized in that: The outer wall front and back of the two protection boxes (18) is fixedly connected with a connecting piece (19), the bottom of a plurality of connecting pieces (19) is respectively threadedly connected with the top rear end of the base (1) on the left and right sides.

7. An in-hole sander for resin buttons according to claim 2, characterized in that: The outer wall right top of the right fixed column (10) is fixedly connected with a controller (20), the controller (20) is respectively electrically connected with the motor (202) and the grinding machine (13).

8. An in-hole sander for resin buttons according to claim 1, characterized in that: The outer wall right end rear side of the placement block (5) is fixedly connected with a blocking rod (8), the top end middle left side of the base (1) is fixedly connected with a limiting rod two (9), the inner wall of the blocking rod (8) is clamped with the outer wall of the limiting rod two (9), the inner wall of the placement block (5) is slidably connected with a limiting rod one (25) around, a plurality of the clamping plates (7) are slidably connected with the outer side of the corresponding limiting rod one (25) respectively.