A concealed casement lower hinge

Abstract

The application discloses a hidden casement lower hinge, which comprises a window frame mounting assembly and a hinge body, the window frame mounting assembly comprises a bottom plate and a base, the bottom plate is fixed with the base through rivets, the base is fixed with a window frame through a locking screw, an inner reverse block is mounted on one end of the base, and the bottom plate is provided with a first notch corresponding to the inner reverse block and matched with the inner reverse block, the hinge body comprises a sash connector, a small connecting rod, a long connecting rod and a short connecting rod, and the long connecting rod, the short connecting rod and the small connecting rod are riveted with the sash connector into a multi-connecting rod structure, so that the hinge body can be opened by 180 degrees. The hidden casement lower hinge is designed in a split structure, so that the whole window mounting and positioning are more accurate, more convenient and faster, a larger inner reverse angle can be realized, more sash profiles, sash sizes and larger ventilation can be matched.

Description

A concealed hinged bottom hinge Technical Field

[0001] This invention relates to the field of door and window technology, specifically to a concealed casement hinge. Background Technology

[0002] Currently, the lower hinges used in conventional inward-opening bottom-hung windows can only open to 90 degrees. With the development of technology, users have an increasing demand for lower hinges that can open to 180 degrees and have high load-bearing capacity. However, the lower hinges are mostly one-piece, which is difficult to align and install when the window sash is heavy, and usually requires two people to complete the installation. At the same time, the hinge adjustment structure is not perfect, which makes the window sash not sealing well when closed, and the opening and closing is not smooth. This may cause the window sash to tilt inward or open inward with a low angle and have insufficient safety. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a concealed casement hinge with a split installation structure. Based on this split installation structure, it has a larger tilt-in angle when tilted inward, accommodating more window sash sizes and providing greater ventilation.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a concealed casement hinge, the concealed casement hinge comprising a window frame mounting assembly and a hinge body, the window frame mounting assembly comprising a base plate and a base, the base plate being fixed to the base by rivets, the base being fixed to the window frame by a pointed set screw, an inward-curving block being mounted on one end of the base, and the base plate having a first groove corresponding to the inward-curving block for the inward-curving block to fit into, the hinge body comprising a sash connector, a small connecting rod, a long connecting rod, and a short connecting rod. The fan connector includes an integrally vertically arranged longitudinal connecting seat and a transverse connecting seat. The bottom end of the longitudinal connecting seat is riveted to one end of the long connecting rod. The other end of the long connecting rod is riveted to the second slot of the base plate by a sliding rivet. One end of the short connecting rod is hinged to one end of the small connecting rod. The other end of the small connecting rod is riveted to the transverse connecting seat. The other end of the short connecting rod passes through the base plate and is riveted to the inner chamfer by an inner chamfer. The middle part of the short connecting rod is hinged to the middle part of the long connecting rod. An eccentric nail is provided on one side of the second slot.

[0005] The longitudinal connecting seat is provided with an adjusting cylinder, and the adjusting cylinder is provided with an up-and-down adjusting mechanism. The up-and-down adjusting mechanism includes a support column, a steel ball, and an adjusting screw. The support column is located at the end of the long connecting rod, and the steel ball is located at the top of the support column. The top of the steel ball abuts against the bottom of the adjusting screw.

[0006] The second slot is an integral slot of different sizes.

[0007] The longitudinal connecting seat is also provided with a horizontal adjustment block, which is fixed to the round hole of the longitudinal connecting seat by a flat-end set screw.

[0008] The horizontal adjustment block includes an adjustment block base and an adjustment block boss tip, and the longitudinal connecting seat is provided with a square hole that is adapted to engage with the adjustment block boss tip.

[0009] The base is provided with a threaded boss at one end, and the window sash can be adjusted in the left and right directions by adjusting the screw in conjunction with the threaded boss.

[0010] The base has a C-shaped bayonet at one end; and / or a C-shaped bayonet on one side of the base.

[0011] A climbing block is riveted to one end of the base plate at the bottom of the long connecting rod by hollow rivets.

[0012] The longitudinal connecting seat has a limiting boss on one side, which cooperates with the bending opening at the head of the base plate for limiting.

[0013] The transverse connecting seat is riveted with a locking plate in the middle. The locking plate is rotated to engage with the fan slot and lock the fan in place, thus enabling installation with the fan.

[0014] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention provides a concealed casement hinge, comprising a window frame mounting assembly and a hinge body. The window frame mounting assembly includes a base plate and a base. The base plate is fixed to the base by rivets, and the base is fixed to the window frame by set screws. An inward tilting block is mounted on one end of the base. The base plate has a first slot corresponding to the inward tilting block for the inward tilting block to fit. The hinge body includes a sash connector, a small connecting rod, a long connecting rod, and a short connecting rod. The sash connector includes an integrally vertically arranged longitudinal connecting seat and a transverse connecting seat. The bottom end of the longitudinal connecting seat is riveted to one end of the long connecting rod. The long connecting rod, short connecting rod, and small connecting rod are riveted to the sash connector to form a multi-link structure, thereby enabling the hinge body to open 180 degrees. This concealed casement hinge, through its split structure design, allows for more precise and convenient window installation and positioning, and enables a larger inward tilting angle, accommodating more window sash sizes and greater ventilation. Attached Figure Description

[0015] Figure 1 is an exploded view of the concealed hinged lower hinge of Embodiment 1 of the present invention;

[0016] Figure 2 is a schematic diagram of the concealed hinged lower hinge in the closed state of Embodiment 1 of the present invention.

[0017] Figure 3 is a schematic diagram of the first structure of the concealed hinged lower hinge in the open state according to Embodiment 1 of the present invention.

[0018] Figure 4 is a schematic diagram of the second structure of the concealed hinged lower hinge in the open state of Embodiment 1 of the present invention.

[0019] Figure 5 is a schematic diagram of the assembly of the window frame mounting components according to Embodiment 1 of the present invention;

[0020] Figure 6 is a first cross-sectional view of the window frame mounting assembly in Embodiment 1 of the present invention;

[0021] Figure 7 is a second cross-sectional view of the window frame mounting assembly in Embodiment 1 of the present invention;

[0022] Figure 8 is a schematic diagram of the assembly of the hinge body and the window frame mounting assembly in Embodiment 1 of the present invention;

[0023] Figure 9 is a first cross-sectional view of the hinge body installation in Embodiment 1 of the present invention;

[0024] Figure 10 is a second cross-sectional view of the hinge body installation according to Embodiment 1 of the present invention;

[0025] Figure 11 is a cross-sectional view of the installation of the inner barbed rivet (A) and the sliding rivet (B) in Embodiment 1 of the present invention;

[0026] Figure 12 is a schematic diagram of the movement of the sliding rivet in Embodiment 1 of the present invention in the hinge-mounted (C) and hinge-moved (D) states;

[0027] Figure 13 is an exploded view of the fan connector and horizontal adjustment block in Embodiment 1 of the present invention;

[0028] Figure 14 is a diagram showing the combined state of the fan connector and the horizontal adjustment block in Embodiment 1 of the present invention.

[0029] Figure 15 is a first schematic diagram of the inward anti-detachment method in Embodiment 1 of the present invention;

[0030] Figure 16 is a second schematic diagram of the inward anti-detachment method in Embodiment 1 of the present invention;

[0031] Figure 17 is a schematic diagram of the hidden hinge pressure adjustment of Embodiment 1 of the present invention;

[0032] Figure 18 is a schematic diagram of the up-and-down adjustment of the concealed hinge in Embodiment 1 of the present invention.

[0033] Figure 19 is a schematic diagram of the horizontal adjustment of the concealed swing hinge in Embodiment 1 of the present invention;

[0034] Figure 20 is a schematic diagram of the eccentric nail angle limiting principle of Embodiment 1 of the present invention;

[0035] Figure 21 is a schematic diagram of the overall assembly of the concealed casement lower hinge and the window sash in Embodiment 1 of the present invention.

[0036] Figure 22 is a schematic diagram of the sliding rivet structure of Embodiment 1 of the present invention;

[0037] Figure 23 is a schematic diagram of the sliding rivet structure of Embodiment 2 of the present invention;

[0038] Figure 24 is an exploded view of the concealed hinged lower hinge of Embodiment 2 of the present invention;

[0039] Figure 25 is a schematic diagram of the assembly of the hinge body and the window frame mounting components in Embodiment 2 of the present invention;

[0040] Figure 26 is a cross-sectional view of the installation of the inner barbed rivet (A) and the sliding rivet (B) in Embodiment 2 of the present invention;

[0041] Figure 27 is a schematic diagram of the movement of the sliding rivet in the hinge-mounted (C) and hinge-moved (D) states of Embodiment 2 of the present invention;

[0042] Figure 28 is a first schematic diagram of the inward anti-detachment method in Embodiment 2 of the present invention;

[0043] Figure 29 is a bottom view of Embodiment 2 of the present invention when the hinge opening angle is 0 degrees;

[0044] Figure 30 is a cross-sectional view (E) when the hinge opening angle is 0 degrees and a cross-sectional view (F) when it is tilted inward at 0 degrees in Embodiment 2 of the present invention;

[0045] Figure 31 is a bottom view of Embodiment 2 of the present invention with the hinge opened to other angles (<90 degrees);

[0046] Figure 32 is a cross-sectional view of Figure 31 in the open state;

[0047] Figure 33 is a bottom view of Embodiment 2 of the present invention with the hinge opened to other angles (>90 degrees);

[0048] Figure 34 is a cross-sectional view of Figure 33 in the open state.

[0049] Explanation of the numbers in the diagram: 1. Base plate; 2. Base; 3. Pointed set screw; 4. Inner bevel; 5. First slot; 6. Fan connector; 61. Longitudinal connecting seat; 62. Transverse connecting seat; 63. Adjusting cylinder; 64. Square hole; 65. Round hole; 66. Limiting boss; 7. Small connecting rod; 8. Long connecting rod; 9. Short connecting rod; 10. Sliding rivet; 11. Inner bevel; 12. Second slot; 13. Eccentric screw; 14. Support column; 15. Steel ball; 16. Adjusting... 17. Leveling screw; 171. Adjusting block base; 172. Adjusting block boss tip; 18. Flat end set screw; 19. Threaded boss; 20. Adjusting screw; 21. C-shaped bayonet; 22. Climbing block; 23. Hollow rivet; 101. Opening; 102. Limiting groove; 24. Locking plate; 25. Locking plate rivet; 26. Rivet; 201. Base boss; 202. Guide groove; 27. Inner groove; 28. Washer; 29. ​​Slot. Detailed Implementation

[0050] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] Example 1

[0053] Please refer to Figures 1-22, which are schematic diagrams of the structure and components of the concealed inward-opening lower hinge of Embodiment 1 of the present invention. As shown in the figures, the present invention provides a concealed inward-opening lower hinge, the overall structure of which includes a window frame mounting assembly and a hinge body. The window frame mounting assembly includes a base plate 1 and a base 2. The base plate 1 is fixed to the base 2 by rivets 26, and the base 2 is fixed to the window frame by pointed set screws 3. An inward-opening block 4 is installed on one end of the base 2. The base plate 1 is provided with a first slot 5 for the inward-opening block 4 to fit at the corresponding position. The hinge body includes a sash connector 6 and a small... The connector includes a connecting rod 7, a long connecting rod 8, and a short connecting rod 9. The fan connector 6 includes an integrally vertically arranged longitudinal connecting seat 61 and a transverse connecting seat 62. The bottom end of the longitudinal connecting seat 61 is riveted to one end of the long connecting rod 8. The other end of the long connecting rod 8 is riveted to the second slot 12 of the base plate 1 by a sliding rivet 10. One end of the short connecting rod 9 is hinged to one end of the small connecting rod 7. The other end of the small connecting rod 7 is riveted to the transverse connecting seat 62. The other end of the short connecting rod 9 passes through the base plate 1 by an inner barb 11 and is riveted to an inner barb 4. The middle part of the short connecting rod 9 is hinged to the middle part of the long connecting rod 8. An eccentric pin 13 is provided on one side of the second slot 12.

[0054] An eccentric pin is installed on one side of the second slot in the middle of the base plate. When the eccentric pin rotates towards the second slot to a certain angle, it restricts the movement range of the sliding rivet within the second slot, thereby controlling the overall maximum opening angle of the hinge. Refer to Figure 20 for details. In Figure 20, c represents the point where the eccentric pin rotates to its 90-degree limit, forming a dead point structure where the eccentric pin and the sliding rivet are collinear. At this point, the eccentric pin cannot rotate, thus limiting the maximum opening angle of the hinge to 90 degrees. When the eccentric pin rotates outward towards the second slot, the maximum angle increases from the 90-180 degree limit state (Figure b), further increasing to the unrestricted opening angle state of 180 degrees (Figure a). Further rotation allows the hinge to achieve the maximum angle limit function. To achieve the desired effect, the end of the short connecting rod is bent upwards to create sufficient space for the eccentric pin.

[0055] In one possible implementation, a C-shaped latch 21 is provided at the other end of the base; and / or a C-shaped latch 21 is provided on one side of the base. This is used for locking into the window frame groove for positioning. The base also has positioning screws that cooperate with the C-shaped latch structure on one side of the base to install the base onto the window frame groove. Combined with corner positioning, this achieves quick positioning and installation.

[0056] In one possible implementation, a locking plate 24 is riveted to the middle of the transverse connecting seat, and the locking plate is rotated to engage with the fan slot to lock and achieve installation with the fan.

[0057] Specifically, the locking plate 24 has a bending punch, and the lateral connecting seat of the fan connector has a matching opening in the middle. By rotating the locking plate, it can be locked with the fan slot to achieve quick installation with the fan, and further locked by the locking plate rivet 25.

[0058] The base also includes a base boss 201, which engages with a corresponding slot on the base plate. Additionally, a guide groove 202 is provided on the base corresponding to the second slot 12. The guide groove 202 primarily provides space for the sliding rivet 10 to be guided and slid. The specific structural shape is not limited; the accompanying drawings of this embodiment are only illustrative.

[0059] The separate design of the window frame mounting components and the hinge body allows for quick installation by a single person. During installation, the window frame mounting components are separated from the hinge body. First, the base plate and base are positioned and installed on the window frame (as shown in Figures 5-7). The window frame has horizontal slots (Figure 6) for positioning the window frame mounting components without drilling, allowing for quick installation without additional screws. Vertically, the window frame has snap-fit ​​slots that engage with the C-shaped snap-fit ​​slots on the base for positioning and installation without drilling or screws. The hinge body, along with the sash connector, fits into the sash. A wrench is used to tighten the locking rivet at the bottom of the sash connector, locking the rivet into the bottom of the sash slot. The installer then lifts the window sash, allowing the sliding rivets and internal underpinning rivets in the hinge to slide into the corresponding slots on the base plate (as shown in Figure 8). This allows for quick installation of the entire window by a single person, making it more convenient than existing similar products.

[0060] The window sash also features slots in the horizontal direction (as shown in Figure 9) to facilitate the positioning and engagement of the hinge body, enabling quick installation without drilling or screws. Furthermore, slots are also provided in the vertical direction of the window sash (as shown in Figure 10) to facilitate the vertical positioning and engagement of the hinge body, specifically the sash connector, for secure installation. Specifically, the vertical connecting seat has internal grooves 27 on both sides that engage with the slots on the window sash, achieving drilling-free and screw-free installation.

[0061] In this invention, the bottom ends of the inner underpin and the sliding rivet are designed as bevels, which makes it easier to insert during installation (see Figures 8-11).

[0062] In addition, the second slot on the base plate of the present invention is an integral large and small slot, that is, one end is a large slot and the other end is a small slot, and the two slots are connected, as shown in Figure 12. When the parts are installed separately, the sliding rivet first passes through the large slot (Figure 12, upper part). After installation, when the hinge moves, the sliding rivet enters the small slot (Figure 12, lower part), so that the hinge will not come out when it is opened.

[0063] The beveled design of the inward-curving rivets and sliding rivets also provides an inward-curving anti-loosening effect (as shown in Figure 16).

[0064] The present invention does not impose any particular limitations on the specific design of the beveled bottom end of the inward-tilting rivet and the sliding rivet, as long as it facilitates insertion and provides an inward-tilting anti-loosening effect after hinge installation. The accompanying drawings of this invention provide two possible specific structures for the sliding rivet (see Figures 22 and 23). In one implementation, the bottom end of the sliding rivet is designed as a T-shaped bevel, which adapts to the guide groove of the base to achieve limiting and sliding. When using the sliding rivet structure shown in Figure 22, as shown in Figures 15 and 16, when tilted inward at 0-70 degrees, the sliding rivet can be pulled upward. At this angle, the inward-tilting anti-loosening effect is not very obvious. However, at other angles, it can fully provide the inward-tilting anti-loosening effect. Through its beveled bottom structure design, it facilitates insertion into the slot during installation and provides an anti-loosening effect in the inward-tilting state after hinge installation. It should be noted that the specific form of the sliding rivet in other figures of Embodiment 1 of this invention is illustrated by the example in Figure 22.

[0065] Similarly, as long as the above-mentioned technical effects of the present invention can be achieved, there are no particular limitations on the specific shape and design of the bevel of the inverted nail.

[0066] In another possible implementation, a limiting boss 66 is provided on the outer side of one end of the longitudinal connecting seat, and the limiting boss 66 cooperates with the bending opening 101 at the head of the base plate 1 for limiting.

[0067] The limiting boss and the bending opening at the head of the base plate work together to limit and fix the device. This not only facilitates quick installation, but also provides a technical effect of preventing the device from tipping over and falling off (as shown in Figure 15).

[0068] In one possible implementation, an adjusting cylinder 63 is provided on the longitudinal connecting seat, and an up-and-down adjusting mechanism is provided inside the adjusting cylinder 63. The up-and-down adjusting mechanism includes a support column 14, a steel ball 15, and an adjusting screw 16. The support column 14 is located at the end of the long connecting rod 8, and the top of the support column 14 is provided with a steel ball 15. The top of the steel ball 15 abuts against the bottom of the adjusting screw 16.

[0069] A support column is provided at the end of the long connecting rod, allowing the support column and the sash connector to rotate relative to each other. A steel ball is placed between the two. The upper part of the adjusting cylinder is provided with a threaded hole and connected to an adjusting screw. The adjusting screw abuts against the top of the steel ball. Turning the adjusting screw, the reaction force between the steel ball and the support column causes the sash connector to move up and down relative to the support column. This allows the sash connector to drive the window sash to adjust up and down, thereby solving problems such as window sash size deviation and tilt angle.

[0070] In one possible implementation, a horizontal adjustment block 17 is also provided on the longitudinal connecting seat 61, and the horizontal adjustment block 17 is fixed to the round hole 65 of the longitudinal connecting seat 61 by a flat-end set screw 18.

[0071] Specifically, as shown in Figures 13-14, the horizontal adjustment block 17 includes an adjustment block base 171 and an adjustment block boss tip 172, and the longitudinal connecting seat 61 is provided with a square hole 64 that is adapted to engage with the adjustment block boss tip 172.

[0072] This horizontal adjustment block enables window sash pressure adjustment. It consists of a horizontal adjustment block and screws. A flat-end set screw is screwed into the horizontal adjustment block, and then the screw and the tip of the horizontal adjustment block's boss are inserted into the square hole of the longitudinal connecting seat, thus riveting (press-fitting) the tip of the adjustment block's boss. Because the two ends of the flat-end set screw abut against the inner wall of the square hole, when the user uses a hex wrench to tighten the flat-end set screw through the round hole, the horizontal adjustment block can move a certain range along the axial direction of the flat-end set screw. By adjusting the flat-end set screw, the horizontal adjustment block is moved, thereby moving the window sash. The spacing of the sealing strip can be adjusted within a certain range of the window sash, increasing the window sash's sealing performance and thus achieving window sash pressure adjustment (as shown in Figure 17).

[0073] As the horizontal adjustment block is inserted into the window profile groove along with the sash connector, the horizontal adjustment base and the window sash groove fit tightly together, thereby adjusting the tightness between the hinge frame and the sash. This adjusts the pressure on the sealing strip after the door and window are closed, achieving better airtightness and watertightness. Compared with existing solutions on the market, this horizontal adjustment structure is more convenient to operate and has better long-term stability.

[0074] In one possible implementation, a threaded boss 19 is provided at one end of the base, and the window sash can be adjusted in the left and right directions by adjusting the screw 20 in conjunction with the threaded boss 19.

[0075] The adjusting screw abuts against the two ends of the square hole on the base plate used to accommodate the threaded boss. Tightening the adjusting screw causes the base plate and the base to move horizontally relative to each other, achieving the effect of adjusting the horizontal gap between the frame and the sash, thus solving common problems such as sash tilting. The horizontal adjustment mechanism of similar products on the market is usually located at the bottom of the window sash, which is particularly inconvenient, or even impossible, in the application of floor-to-ceiling windows. This solution's adjustment mechanism provides a more user-friendly solution.

[0076] In one possible implementation, a climbing block 22 is riveted to one end of the base plate 1 at the bottom of the long connecting rod 8 by a hollow rivet 23.

[0077] The lifting block passes through the base plate and is riveted to the base. The slope of the lifting block lifts the bottom of the long connecting rod to prevent it from falling. Furthermore, the lifting block provides support as it climbs along the slope. When the base plate is leveled, the lifting block remains stationary, connected to the base. When the window sash is closed, the deflection caused by weight will come into contact with the top surface of the lifting block, thus mitigating deflection and metal fatigue, further improving the hinge's lifespan and load-bearing capacity.

[0078] Referring to Figure 21, the design of the above adjustment mechanism can realize the three-dimensional adjustment function of the concealed casement hinge of the present invention, adjust the sealing performance of the window sash, and solve the problem of tilting and falling sash.

[0079] In this embodiment of the invention, washers 28 are provided on the contact surfaces of each connecting component of the concealed hinge. The design of these washers prevents excessive friction and damage during the movement of the components, thereby extending the overall service life of the hinge. Specifically, the shape of the washers adapts to different locations. For example, T-shaped washers are used on support columns to accommodate their specific structural installation. The shape or structure of washers in other locations is not explained in detail here, as long as the desired technical effect is achieved.

[0080] Example 2

[0081] The hinged lower hinge in Embodiment 2 is the same as that in Embodiment 1 in terms of other structural components and their functions. The difference is that the hinged lower hinge in Embodiment 2 uses the sliding rivet structure shown in Figure 23. In this structure, the bottom bevel of the sliding rivet is designed as a 7-shaped bevel. In order to adapt to the sliding rivet of this structure and achieve a better inward tilting and anti-disengagement effect, the guide groove of the base has also been adapted. Specifically, it is designed to have space for the bottom bevel of the sliding rivet to move in the inward tilting state, and to restrict the 7-shaped bevel from coming out of the groove, so as to achieve an inward tilting and anti-disengagement effect at any angle.

[0082] Figure 24 shows an exploded view of the concealed hinged hinge of Embodiment 2 of the present invention. The overall shape of the guide groove is adapted to the second slot. At the small slot of the guide groove relative to the second slot, a bottom-facing upward-facing inner groove is formed on one side of the sliding rivet's inclined surface. When the sliding rivet slides into the large slot, it enters the small slot. The 7-shaped inclined surface is just engaged with the bottom-facing upward-facing groove of the guide groove, so that the sliding rivet can move within the bottom-facing upward-facing groove but cannot come out, thus achieving an inward-tilting anti-loosening effect.

[0083] In Example 2, the hinge body is fitted with the sash connector and then the locking rivet at the bottom of the sash connector is turned with a wrench to lock the locking plate into the bottom of the sash groove. Then the installer lifts the window sash and slides the sliding rivet and the inner overhanging rivet in the hinge into the corresponding grooves on the base plate component in turn (as shown in Figures 25-27).

[0084] Based on the specific structural design of the sliding rivet in Embodiment 2, and in conjunction with the specific structural cooperation of the corresponding guide groove on the base, it is possible to ensure an anti-disengagement effect when tilted inward at any angle. Referring to Figures 28-34 in the instruction manual, the anti-disengagement effect of the inclined surface at the bottom of the sliding hinge is demonstrated from different angles in the tilted-in state. In other words, there will be no upward disengagement at any opening angle, ensuring safe use.

[0085] To meet the gap requirements of the frame and sash being flush with the profile and to achieve the actual effect of opening 180 degrees, the lower hinge of this invention adopts a five-bar linkage motion trajectory scheme with optimized dimensions, which minimizes the size of the core linkage to reduce hinge deflection and alleviate the situation of the window sash sagging under weight, thereby making the hinge load-bearing performance reach a more ideal state.

[0086] The above detailed description of the concealed casement lower hinge, in conjunction with the accompanying drawings, illustrates that the lower hinge of this invention mainly consists of two parts: the hinge body and the window frame mounting assembly. The window frame mounting assembly includes a base plate and a base. The base is riveted to the base plate. The upper head of the base has a C-shaped snap-fit ​​structure for positioning at the corner of the frame groove. The base also has a C-shaped snap-fit ​​on one side and a positioning screw. This screw, in conjunction with the snap-fit ​​structure on one side of the base, mounts the base into the frame groove, achieving quick positioning and installation with the corner positioning. The end of the base has a threaded boss, allowing for hinge level adjustment by screwing in an adjusting screw. An inner chamfer is provided between the base head and the base plate for separate installation, and a second slot in the middle is provided for sliding rivet installation of the separate connecting rod. A lifting block is also provided on the base plate, riveted to the base with hollow rivets. The lifting block has a certain slope, enabling the hinge to be lifted as a whole, achieving a hinge anti-fall effect.

[0087] The hinge body is constructed by riveting short connecting rods, long connecting rods, small connecting rods, and the fan connector into a multi-link structure, allowing the hinge body to open 180 degrees while also providing space for the hinge to tilt inwards. A sliding rivet with a sloping bevel design is riveted to the end of the long connecting rod, facilitating its insertion into the second slot of the base. A support column is riveted to the head of the long connecting rod. The fan connector is an L-shaped connector, including a horizontal and a vertical connector. The vertical connector has recessed grooves on both sides for insertion into the fan slot and also includes an adjusting cylinder (specifically, a long threaded hole). By inserting an adjusting screw and a steel ball, the support column of the long connecting rod is connected. The adjusting screw, combined with the reaction force between the steel ball and the support column, allows the fan connector to be adjusted vertically. The longitudinal connector has a square hole at its head and a threaded round hole on its side, accommodating a horizontal adjustment block with a threaded boss at one end and a convex structure at the other. The horizontal adjustment block is inserted into the square hole, and a flat-end set screw is screwed in. Simultaneously, the fan connector is inserted into the fan slot. By adjusting the flat-end set screw, the convex structure at the bottom of the horizontal adjustment block moves, allowing the fan slot to be adjusted forward and backward. A limit boss is provided on the outer side of one end of the longitudinal connector of the fan connector. This limit boss mates with a bent opening at the head of the base plate for positioning during inward tilting. A locking plate is riveted to the middle of the transverse connector of the fan connector. The locking plate has a bent punch, and the transverse connector has a corresponding opening. Rotating the locking plate locks it into the fan slot, enabling quick installation of the fan.

[0088] Furthermore, based on the concealed casement hinge of this invention, the maximum opening angle can be adjusted, thereby preventing the window sash from opening too wide and causing inertial impact on the interior.

[0089] The concealed casement hinge of this invention features a partial separation between the hinge body and the base plate component, resulting in a larger inward tilt angle compared to similar products. This allows it to accommodate a wider range of window sash sizes and greater ventilation. Furthermore, the split installation structure enables more precise and convenient installation and positioning of the entire window sash, saving on installation labor costs. Additionally, it eliminates the need for additional screws, allowing for quick installation and adjustment.

[0090] The concealed casement bottom hinge of the present invention is suitable for use on inward casement bottom-hung windows and can be adapted to frame and sash flush profiles.

[0091] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A concealed hinged lower hinge, characterized in that, The concealed casement hinge includes a window frame mounting assembly and a hinge body. The window frame mounting assembly includes a base plate and a base. The base plate is fixed to the base by rivets, and the base is fixed to the window frame by a set screw. An inward-curving block is mounted on one end of the base. The base plate has a first slot corresponding to the inward-curving block for the inward-curving block to fit. The hinge body includes a sash connector, a small connecting rod, a long connecting rod, and a short connecting rod. The sash connector includes an integrally vertically arranged longitudinal connecting seat and a transverse connecting seat. The bottom end of the longitudinal connecting seat is connected to the long connecting rod. The long connecting rod is riveted to the second groove of the base plate by means of a sliding rivet. One end of the short connecting rod is hinged to one end of the small connecting rod. The other end of the small connecting rod is riveted to the transverse connecting seat. The other end of the short connecting rod passes through the base plate and is riveted to the inner chamfer by means of an inner chamfer. The middle part of the short connecting rod is hinged to the middle part of the long connecting rod. An eccentric nail is provided on one side of the second groove. The end of the short connecting rod is bent upward. A limiting boss is provided on the outer side of one end of the longitudinal connecting seat. The limiting boss cooperates with the bending opening at the head of the base plate for limiting.

2. The concealed hinged lower hinge according to claim 1, characterized in that, An adjusting cylinder is provided on the longitudinal connecting seat, and an up-and-down adjusting mechanism is provided inside the adjusting cylinder. The up-and-down adjusting mechanism includes a support column, a steel ball, and an adjusting screw. The support column is located at the end of the long connecting rod, and the steel ball is located at the top of the support column. The top of the steel ball abuts against the bottom of the adjusting screw.

3. The concealed hinged lower hinge according to claim 1, characterized in that, The second slot is an integral slot of different sizes.

4. The concealed hinged lower hinge according to claim 1, characterized in that, The longitudinal connecting seat is also provided with a horizontal adjustment block, which is fixed to the round hole of the longitudinal connecting seat by a flat-end set screw.

5. The concealed hinged lower hinge according to claim 4, characterized in that, The horizontal adjustment block includes an adjustment block base and an adjustment block boss tip, and the longitudinal connecting seat is provided with a square hole that is adapted to engage with the adjustment block boss tip.

6. The concealed hinged lower hinge according to claim 1, characterized in that, The base is also provided with a threaded boss at one end, and the window sash can be adjusted in the left and right directions by adjusting the screw in conjunction with the threaded boss.

7. The concealed hinged lower hinge according to claim 6, characterized in that, The other end of the base is provided with a C-shaped bayonet; and / or one side of the base is provided with a C-shaped bayonet.

8. The concealed hinged lower hinge according to claim 1, characterized in that, A climbing block is riveted to one end of the base plate at the bottom of the long connecting rod by hollow rivets.

9. The concealed hinged lower hinge according to claim 1, characterized in that, A locking plate is riveted to the middle of the transverse connecting seat. The locking plate is rotated to engage with the fan slot and lock the fan in place, thus enabling installation.

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