CN214943791U

CN214943791U - Electric opening height waterproof large-scale glass shutter and window sash mounting structure thereof

Info

Publication number: CN214943791U
Application number: CN202121142778.8U
Authority: CN
Inventors: 王胜密; 李书智; 骆礼程
Original assignee: Shenzhen Torich Construction Engineering Co ltd
Current assignee: Shenzhen Torich Construction Engineering Co ltd
Priority date: 2020-08-13
Filing date: 2021-05-26
Publication date: 2021-11-30
Anticipated expiration: 2031-05-26

Abstract

The invention relates to an electric opening high-waterproof large-sized glass shutter and a window sash mounting structure thereof, which comprise a rotary connecting base and two groups of glass mounting bases, wherein the two groups of glass mounting bases are arranged at two ends of the rotary connecting base, and the glass mounting bases are integrally formed. Above-mentioned electronic high waterproof large-scale glass shutter of opening and casement mounting structure thereof sets up the integrated into one piece design through will rotating connection base and glass mounting base, has very strong bearing capacity to changed traditional glass shutter and utilized glass blade to press from both sides the defect of installing glass and bearing capacity is not enough, through the shutter that uses this kind of casement mounting structure, every casement area greatly increased that can install, draught area is bigger, and anti-wind pressure ability is stronger.

Description

Electric opening height waterproof large-scale glass shutter and window sash mounting structure thereof

Technical Field

The utility model belongs to the technical field of the shutter technique and specifically relates to an electronic high waterproof large-scale glass shutter of opening and casement mounting structure thereof.

Background

In the field of building doors and windows, glass shutters cannot be separated, and the existing glass shutters have various structures. Creation of

The technical level of the prior art and the disadvantages of the prior art are that: the existing glass shutter is of a small window type, the glass blade clamp is arranged on a left U-shaped window frame and a right U-shaped window frame through a rotating shaft, glass is generally of a single layer, and the glass blade clamp is pulled to rotate through a transmission rod assembly (driven by a hand or a motor). The window is limited by the glass blade clamp, the transmission rod component, the U-shaped window frame structure and the material strength, the weight of the window is generally not more than 50kg, the size of the whole frame is small, the ventilation area is not large, the wind pressure resistance is not strong, and the requirement of pursuing larger ventilation area in modern buildings is difficult to meet. Due to the above product defects, the glass shutters in the market at present are very limited in use.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a large waterproof window sash installation structure with electrically-operated opening height having strong load-bearing capacity;

in view of the above, it is desirable to provide a large electrically openable, highly waterproof glass blind having a larger ventilation area and a higher wind pressure resistance.

The utility model provides an electronic high waterproof large-scale glass casement mounting structure that opens, includes the casement base for install the casement, the casement base is including rotating connection base and glass mounting base, and the glass mounting base is provided with two sets ofly, and just two sets of glass mounting bases set up in rotating connection base both ends, glass mounting base and glass mounting base integrated into one piece design.

Preferably, the glass mounting base comprises a U-shaped groove, a connecting seat and a rotating shaft mounting seat, the U-shaped groove is formed in one side of the connecting seat in the transverse direction, the rotating shaft mounting seat is arranged on one side of the connecting seat in the longitudinal direction, a first rotating shaft mounting through hole is formed in the middle of the rotating shaft mounting seat along the length direction of the rotating shaft mounting seat, the U-shaped groove is connected to one side of the rotating shaft mounting seat, a first installation avoiding groove is formed in the other side of the rotating shaft mounting seat, a positioning hole is formed in one side of the rotating shaft mounting seat in a deviating mode, and the opening direction of the U-shaped groove deviates from one side of the rotating shaft mounting seat towards the connecting seat.

Preferably, the rotating shaft mounting seat is provided with a first sealing rubber strip mounting notch and a second sealing rubber strip mounting notch, the first sealing rubber strip mounting notch is arranged on one side, close to the U-shaped groove, of the positioning hole, the opening direction of the first sealing rubber strip mounting notch deviates from the connecting seat, the second sealing rubber strip mounting notch is arranged on one side, deviating from the U-shaped groove, of the positioning hole, and the opening direction of the second sealing rubber strip mounting notch deviates from the U-shaped groove.

The utility model provides an electronic high waterproof large-scale glass shutter that opens, includes casement mounting structure, window frame, casement actuating mechanism, rotates coupling mechanism one and rotates coupling mechanism two, and the relative both sides of casement all set up glass mounting base, and the casement is installed in glass mounting base's U type groove, rotates coupling mechanism one and connects and rotate coupling mechanism and casement actuating mechanism, rotates coupling mechanism two and connects window frame and casement mounting structure, and casement actuating mechanism is used for driving the casement and rotates.

Preferably, the vertical both sides of window frame set up the seal receptacle, and the seal receptacle includes the base, and base one side direction is close to the casement and extends and form the arch, and the base is close to casement one side and sets up joint strip installation breach three.

Preferably, the first rotating connecting mechanism comprises a first fixing piece and a first rotating shaft, the first fixing piece is fixedly connected with the window frame, the first rotating shaft comprises a bearing section and an installation section, the diameter of the installation section is smaller than that of the bearing section, a second rotating shaft installation through hole used for installing the bearing section is formed in the first fixing piece, the installation section is installed in the first rotating shaft installation through hole in an interference fit mode, and the bearing section and the first rotating shaft installation through hole are installed in a through hole clearance fit mode.

Preferably, the second rotating connecting mechanism comprises a second fixing piece, a second rotating shaft and a connecting piece, the second fixing piece is fixedly connected with the rotating connecting base, two ends of the second rotating shaft are respectively fixed on the second fixing piece and the connecting piece, and one end of the connecting piece, which is far away from the second rotating shaft, is connected with the window sash driving mechanism.

Preferably, the two ends of the rotating shaft are designed into square shaft ends, the second fixing piece and the connecting piece are provided with square through holes corresponding to the square shaft ends, and the two ends of the rotating shaft are arranged in the square through holes corresponding to the second fixing piece and the connecting piece.

Preferably, the window sash driving mechanism comprises a telescopic assembly and a transmission rod, the transmission rod is vertically movably arranged on the window frame through a guide rail, the telescopic assembly is arranged on one side, away from the window sash, of the window frame, the telescopic assembly is used for driving the transmission rod to vertically reciprocate, and the connecting piece is rotatably connected with the transmission rod through a rotating shaft III.

Preferably, the glass mounting base above the longitudinal window sash is rotatably connected with the window frame through a first rotating connection mechanism, sealing rubber strips are arranged in a first sealing rubber strip mounting notch, a second sealing rubber strip mounting notch and a third sealing rubber strip mounting notch, a rubber strip pressure cross rod is arranged on the window frame and extends along the length direction of the glass mounting base, and two ends of the rubber strip pressure cross rod are respectively fixed on a first fixing piece on the window frame and on two opposite sides of the window frame.

Above-mentioned electronic high waterproof large-scale glass shutter of opening and casement mounting structure thereof sets up the integrated into one piece design through will rotating connection base and glass mounting base, has very strong bearing capacity to changed traditional glass shutter and utilized glass blade to press from both sides the defect of installing glass and bearing capacity is not enough, through the shutter that uses this kind of casement mounting structure, every casement area greatly increased that can install, draught area is bigger, and anti-wind pressure ability is stronger.

Drawings

FIG. 1 is a schematic view of the closing structure of the electrically opened large waterproof glass blind of the present invention;

FIG. 2 is a schematic view of the opening structure of the electrically-opened large waterproof glass blind of the present invention;

FIG. 3 is a schematic diagram of the structure of the area A in FIG. 2;

FIG. 4 is a schematic view of the structure of the sealing seat for electrically opening a large waterproof glass window of the present invention;

FIG. 5 is a schematic view of the glass mounting base of the present invention;

FIG. 6 is a schematic view of the fitting structure between the glass mounting base and the adhesive tape pressure cross bar between two adjacent sashes of the present invention;

fig. 7 is a schematic structural view of the electric opening high-waterproof large-sized glass window sash mounting structure of the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, will explain the present invention in further detail, with reference to the drawings, of an electric opening highly waterproof large-sized glass blind and its window sash mounting structure. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Please refer to fig. 1-7, the present invention relates to an electric opening high waterproof large-sized glass window sash mounting structure, which comprises a window sash base 200 for mounting a window sash 300, wherein the window sash base 200 comprises a rotating connection base 220 and a glass mounting base 210, the glass mounting base 210 is provided with two sets, and the two sets of glass mounting bases 210 are arranged at two ends of the rotating connection base 220, and the glass mounting base 210 are integrally formed.

Through setting the rotation connection base 220 and the glass installation base 210 to the integrated into one piece design, have very strong bearing capacity to changed traditional glass shutter and utilized glass blade to press from both sides the installation glass and the defect that bearing capacity is not enough, through the shutter that uses this kind of casement mounting structure, every casement 300 area greatly increased that can install, ventilation area is bigger, and anti-wind pressure ability is stronger.

Specifically, the glass mounting base 210 includes a U-shaped groove 211, a connecting seat 212 and a rotating shaft mounting seat 213, the U-shaped groove 211 is disposed on one side of the connecting seat 212, the rotating shaft mounting seat 213 is disposed on one side of the connecting seat 212, a rotating shaft mounting through hole 214 is disposed in the middle of the rotating shaft mounting seat 213 along the length direction of the rotating shaft mounting seat 213, the U-shaped groove 211 is connected to one side of the rotating shaft mounting seat 213, a mounting avoiding groove 216 is disposed on the other side of the rotating shaft mounting seat 213, and a positioning hole 218 is disposed on one side of the rotating shaft mounting seat 213 away from the connecting seat 212.

Specifically, the U-shaped groove 211, the connecting seat 212 and the rotating shaft mounting seat 213 are integrally formed.

Specifically, the U-shaped groove 211 may be replaced by a square mounting groove.

Through setting U type groove 211, connecting seat 212 and pivot mount pad 213 to an organic whole, and glass mounting base 210 sets to an organic whole with rotation connection base 220 for whole glass casement 300 shaping is integrative, possesses very strong bearing strength on the whole.

Specifically, when the window sash 300 is installed, the openings of the U-shaped grooves 211 in the glass installation bases 210 at the two longitudinal ends of the window sash 300 are oppositely arranged, and the window sash 300 is clamped in the two U-shaped grooves 211 and fixed by fixing means such as glue or screws.

Specifically, since the protrusion 120 is disposed on the sealing seat, in order to prevent the window sash 300 from being completely closed due to the abutment between the rotating shaft mounting base and the protrusion 120 when the glass mounting base 210 is mounted, the mounting avoiding groove 216 is disposed, and the size and shape of the mounting avoiding groove 216 correspond to the protrusion 120.

Specifically, the positioning hole 218 is used for installing a pin, and when the first rotating shaft 420 passes through the first rotating shaft installing through hole 214, the pin is inserted into a pin fixing hole formed in the installing section and fixes the first rotating shaft 420, so that the first rotating shaft 420 and the window sash installing structure are fixed together, and the window sash installing structure is rotatably connected with the window frame 100 through the first rotating shaft 420.

Specifically, the rotating shaft mounting seat 213 is provided with a first sealing rubber strip 219 mounting gap 215 and a second sealing rubber strip 219 mounting gap 217, the first sealing rubber strip 219 mounting gap 215 is arranged on one side of the positioning hole 218 close to the U-shaped groove 211, the opening direction of the first sealing rubber strip 219 mounting gap 215 deviates from the connecting seat 212, the second sealing rubber strip 219 mounting gap 217 is arranged on one side of the positioning hole 218 deviating from the U-shaped groove 211, and the opening direction of the second sealing rubber strip 219 mounting gap 217 deviates from the U-shaped groove 211.

Through setting up joint strip 219 installation breach 215, set up joint strip 219 in joint strip 219 installation breach 215, when casement 300 closed, joint strip 219 installation breach 215 on the adjacent glass mounting base 210 in two adjacent casement 300 the opening direction is relative for two relative joint strip 219 extrude each other and form sealing strip one, sealing strip one extends along the length direction of pivot mount pad 213, sealing strip one can effectually prevent wind or rain from getting into indoorly from the gap between two adjacent casement 300.

By arranging the second mounting notch 217 of the sealing rubber strip 219 and arranging the sealing rubber strip 219 in the second mounting notch 217 of the sealing rubber strip 219, when the window sash 300 is closed, the openings of the second mounting notch 217 of the sealing rubber strip 219 on the rotating shaft mounting seat 213 on the window sash 300 in the middle of the window frame 100 face the side away from the window sash 300, a rubber strip pressure cross rod 700 is arranged at the adjacent position of two adjacent window sashes 300, the sealing rubber strips 219 arranged on the second mounting notches 217 of the sealing rubber strip 219 on two adjacent window sashes 300 extrude the rubber strip pressure cross rod 700 to form a second sealing strip, and the second sealing strip extends along the extending direction of the first sealing strip;

sealing rubber 219 on a second mounting notch 217 of the sealing rubber 219 on the rotating shaft mounting seat 213 at the outer side of the window sash 300 at both ends of the window frame 100 and the protrusion 120 on the base 110 are pressed against each other to form a third sealing strip, which extends along the extending direction of the second sealing strip, and the third sealing strip exists, so that outdoor wind and rain cannot enter the room through both longitudinal ends of the window frame 100.

The first sealing band, the second sealing band and the adhesive tape pressure rail 700 form a closed space, so that outdoor wind and rain are blocked by the window sash 300 and the closed space and cannot enter the room, and the waterproof and windproof performance between the installed window sashes 300 is improved.

Through the above sealing structure, that is, the sealing space formed between the third sealing tape and the adjacent window sash 300, it is ensured that outdoor wind and rain cannot enter the room through the gap of the window sash 300, and the wind and rain resistance is greatly enhanced.

The utility model provides an electronic high waterproof large-scale glass shutter that opens, including casement mounting structure, including window frame 100, casement 300, casement actuating mechanism 600, rotate coupling mechanism 500 and rotate coupling mechanism two 400, the relative both sides of casement 300 all set up glass mounting base 210, casement 300 is installed in the U type groove 211 of glass mounting base 210, rotate coupling mechanism 500 and connect and rotate coupling base 220 and casement actuating mechanism 600, rotate coupling mechanism two 400 and connect window frame 100 and casement mounting structure, casement actuating mechanism 600 is used for driving casement 300 to rotate.

Specifically, the window frame 100 is fixedly connected by corner connectors.

Specifically, the window sash 300 is installed through the window sash installation structure, and is rotatably connected to the window frame 100 through the first rotation connection mechanism 500, the window sash installation structure is connected to the window sash driving mechanism 600 through the second rotation connection mechanism 400, and when the window sash driving mechanism 600 operates, the window sash installation structure can be driven by the second rotation connection mechanism 400 to rotate by taking the first rotation connection mechanism 500 as a shaft.

Specifically, the sealing seats are arranged on two vertical sides of the window frame 100, each sealing seat includes a base 110, one side of each base 110 extends to be close to the corresponding window sash 300 to form a protrusion 120, and one side of each base 110, which is close to the corresponding window sash 300, is provided with a third mounting notch 130 of a sealing rubber strip 219.

Concretely, three 130 corresponding connecting seats 212 in joint strip 219 installation breach set up, the opening direction of three 130 of joint strip 219 installation breach deviates from base 110, set up joint strip 219 in three 130 of joint strip 219 installation breach, when closing casement 300, the connecting seat 212 that is in the casement 300 at the vertical both ends of window frame 100 and corresponds place base 110 one side will extrude joint strip 219 and form sealing strip four, sealing strip four and sealing strip three form seal space, further play sealed effect, prevent that outdoor wind and rain from getting into indoorly from the vertical both ends of window frame 100, improve the waterproof and prevent wind performance of casement 300.

Specifically, the first rotating connection mechanism 500 includes a second fixing piece 510, a second rotating shaft 530 and a connection piece 520, the second fixing piece 510 is fixedly connected to the rotating connection base 220, two ends of the second rotating shaft 530 are respectively fixed to the second fixing piece 510 and the connection piece 520, and one end of the connection piece 520 away from the second rotating shaft 530 is connected to the window sash driving mechanism 600.

Specifically, the two ends of the second rotating shaft 530 are designed to be square shaft ends, the second fixing plate 510 and the connecting piece 520 are provided with square through holes corresponding to the square shaft ends, and the two ends of the second rotating shaft 530 are arranged in the square through holes corresponding to the second fixing plate 510 and the connecting piece 520.

Specifically, the square through hole in the second fixing sheet 510 is a square blind hole, and a circular positioning groove is arranged on the second fixing sheet 510 on the side of the square through hole close to the connecting piece 520, and the circular positioning groove is externally tangent to the square blind hole.

The installation through hole of the second rotating shaft 530 is formed in a square shape, connection is convenient, and the second rotating shaft 530, the second fixing piece 510 and the connecting piece 520 are fixedly connected without other fixing pieces, so that materials are saved, and installation is convenient.

Through setting up circular constant head tank, in the installation, the circular constant head tank is taken first to pass in second pivot 530, later can inject square blind hole after rotatory certain angle in, plays the effect of location, easy to assemble second pivot 530.

Specifically, the second rotating connection mechanism 400 comprises a first fixing piece 410 and a first rotating shaft 420, the first fixing piece is fixedly connected with the window frame 100, the first rotating shaft 420 comprises a bearing section and an installation section, the diameter of the installation section is smaller than that of the bearing section, a second rotating shaft installation through hole used for installing the bearing section is formed in the first fixing piece 410, the installation section is installed in the first rotating shaft installation through hole 214 in an interference fit mode, and the bearing section and the first rotating shaft installation through hole are installed in a two-way hole clearance fit mode.

Specifically, the bearing section and the mounting section are set to be different in diameter, the diameter of the bearing section is smaller than that of the mounting section, the diameter of the bearing section is reduced as far as possible under the condition that the bearing section meets the supporting and rotating functions, and materials are saved.

Specifically, the window sash driving mechanism 600 includes a telescopic assembly 610 and a transmission rod 620, the transmission rod 620 is movably disposed on the window frame 100 through the vertical direction of the guide rail, the telescopic assembly 610 is disposed on one side of the window frame 100 departing from the window sash 300, the telescopic assembly 610 is used for driving the transmission rod 620 to vertically reciprocate, and the connecting piece 520 deviates from one side of the guide rail through the three-rotation-shaft-rotation-connection transmission rod 620.

Specifically, the retraction assembly 610 may be a linear motor or a retraction cylinder.

Specifically, the window frame 100 is provided with a rubber strip pressure cross bar 700, the rubber strip pressure cross bar 700 extends along the length direction of the glass mounting base 210, and two ends of the rubber strip pressure cross bar 700 are respectively fixed on the first fixing pieces 410 on two opposite sides of the window frame 100.

The utility model discloses a theory of operation:

windowing: the telescopic assembly 610 drives the transmission rod 620 to move upward, and the link 520 supports the window sash 300 as the transmission rod 620 moves upward.

Window closing: the telescopic assembly 610 drives the transmission rod 620 to move downwards, and the connection member 520 closes the window sash 300 as the transmission rod 620 moves downwards;

the above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, but the present invention is not limited to the above embodiments, and any skilled person familiar with the art can make some changes or modifications to equivalent embodiments of equivalent changes within the technical scope of the present invention without departing from the technical scope of the present invention, but any simple modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the technical scope of the present invention.

Claims

1. The utility model provides an electronic large-scale glass casement mounting structure that opens high waterproof, includes casement base (200) for installation casement (300), its characterized in that: the window sash base (200) comprises a rotary connecting base (220) and a glass mounting base (210), the glass mounting base (210) is provided with two groups, the glass mounting base (210) is arranged at two ends of the rotary connecting base (220), and the glass mounting base (210) are integrally formed.

2. The electric opening highly waterproof large-sized glass window sash mounting structure of claim 1, wherein: glass mounting base (210) include U type groove (211), connecting seat (212) and pivot mount pad (213), U type groove (211) set up in horizontal one side of connecting seat (212), pivot mount pad (213) set up in vertical one side of connecting seat (212), follow in pivot mount pad (213) middle part the length direction of pivot mount pad (213) is seted up pivot installation through-hole (214), U type groove (211) is connected to pivot mount pad (213) one side, the installation is seted up to pivot mount pad (213) opposite side and is kept away a groove (216), pivot mount pad (213) deviate from locating hole (218) are seted up to connecting seat (212) one side, U type groove (211) opening direction towards connecting seat (212) deviate from pivot mount pad (213) one side.

3. The electric opening highly waterproof large-sized glass window sash mounting structure according to claim 2, wherein: pivot mount pad (213) set up joint strip (219) installation breach (215) and joint strip (219) installation breach two (217), joint strip (219) installation breach (215) set up in locating hole (218) are close to U type groove (211) one side, the opening direction of joint strip (219) installation breach (215) deviates from connecting seat (212), joint strip (219) installation breach two (217) set up in locating hole (218) deviates from U type groove (211) one side, just the opening direction of joint strip (219) installation breach two (217) deviates from U type groove (211).

4. An electrically-opened high-waterproof large-sized glass blind comprising the sash mounting structure of any one of claims 1 to 3, characterized in that: including window frame (100), casement (300), casement actuating mechanism (600), rotation coupling mechanism one (500) and rotation coupling mechanism two (400), the relative both sides of casement (300) all set up glass mounting base (210), casement (300) install in U type groove (211) of glass mounting base (210), rotation coupling mechanism one (500) are connected rotation coupling base (220) and casement actuating mechanism (600), it connects to rotate coupling mechanism two (400) window frame (100) and casement mounting structure, casement actuating mechanism (600) are used for the drive casement (300) rotate.

5. The electrically-opened, highly water-resistant large-sized glass blind according to claim 4, wherein: the window frame (100) vertical both sides set up the seal receptacle, the seal receptacle includes base (110), base (110) one side is close to casement (300) extend and form arch (120), base (110) are close to casement (300) one side sets up joint strip (219) installation breach three (130).

6. The electrically-opened, highly water-resistant large-sized glass blind according to claim 4, wherein: rotate coupling mechanism one (500) including stationary blade one (410) and pivot one (420), stationary blade one (410) fixed connection window frame (100), pivot one (420) is including bearing section and erection segment, the erection segment diameter is less than the diameter of bearing section, set up on stationary blade one (410) and be used for the installation the pivot installation through-hole two of bearing section, erection segment interference fit install in pivot installation through-hole one (214), the bearing section with the installation of pivot installation through-hole two through hole clearance fit.

7. The electrically-opened, highly water-resistant large-sized glass blind according to claim 4, wherein: the second rotating connecting mechanism (400) comprises a second fixing piece (510), a second rotating shaft (530) and a connecting piece (520), the second fixing piece (510) is fixedly connected with the rotating connecting base (220), the two ends of the second rotating shaft (530) are fixed to the second fixing piece (510) and the connecting piece (520) respectively, and the connecting piece (520) deviates from the second rotating shaft (530) and one end of the window sash driving mechanism (600) is connected.

8. The electrically-opened, highly water-resistant large-sized glass blind according to claim 7, wherein: the two ends of the second rotating shaft (530) are designed to be square shaft ends, the second fixing plate (510) and the connecting piece (520) correspond to the square shaft ends and are provided with square through holes, and the two ends of the second rotating shaft (530) correspond to the second fixing plate (510) and the connecting piece (520) and are arranged in the square through holes.

9. The electrically-opened, highly water-resistant large-sized glass blind according to claim 7, wherein: casement actuating mechanism (600) includes telescopic component (610) and transfer line (620), transfer line (620) through the vertical mobile setting in of guide rail on window frame (100), telescopic component (610) set up in window frame (100) deviate from casement (300) one side, telescopic component (610) are used for the drive the vertical reciprocating motion of transfer line (620), connecting piece (520) are through three rotatable coupling of pivot transfer line (620).

10. The electrically-opened, highly water-resistant large-sized glass blind according to claim 5, wherein: the glass mounting base (210) above the longitudinal window sash (300) is rotatably connected with the window frame (100) through a first rotating connecting mechanism (500), sealing rubber strips (219) are arranged in a first mounting gap (215), a second mounting gap (217) and a third mounting gap (130) of the sealing rubber strips (219), a rubber strip pressure cross rod (700) is arranged on the window frame (100), the rubber strip pressure cross rod (700) extends along the length direction of the glass mounting base (210), and two ends of the rubber strip pressure cross rod (700) are respectively fixed on a first fixing sheet (410) on the window frame (100) on the two opposite sides.