Anti-mosquito sliding window

Abstract

The utility model discloses an anti-mosquito sliding window which comprises a horizontally-installed sliding groove, a window sash connected with the sliding groove in a sliding mode and a screen window installed on the front side of the window sash, and a sliding mechanism is arranged between the window sash and the screen window. According to the utility model, the sliding mechanism is arranged, so that the screen window can be spread and folded. When the screen window is pulled forwards, the rolling wheel leaves the embedded hole and enters the T-shaped groove, the screen window is pushed rightwards to be staggered with the window sash, and the rolling wheel leaves the T-shaped groove and is aligned with the step shoulder. When the screen window is pressed backwards, the step shoulder abuts against the rolling wheel and is connected with the screen window in a clamped mode, the screen window is flush with the window sash, and the screen window is fixed to the right side of the window sash. Due to the fact that the window sash and the screen window are located on the same plane, installation tightness is improved, the problem that when the window sash and the screen window are installed on different planes, a large installation gap exists between the window sash and the screen window is solved, and a better anti-mosquito effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window structures, in particular to a mosquito-proof sliding window. Background Art

[0002] Doors and windows are crucial components of a building's envelope. They can be categorized by their opening method, including fixed windows, casement windows, sliding windows, and folding windows. Sliding windows are popular for their high light transmittance, wide field of view, and excellent ventilation. In the southern coastal areas, where the climate is warm and humid, mosquitoes breed rapidly. Installing a screen on the outside of a sliding window, which slides relative to the window, can prevent mosquitoes from entering.

[0003] Patent No. ZL 202321563998.7 discloses a sliding door and window, which is used to form a basic door and window structure by providing an outer frame, a first door and window, and a second door and window. By providing a screen, a gear, a first rack plate, and a second rack plate, it can be driven to move in a linkage manner while opening and closing the first door and window, thereby facilitating one-step operation and improving practicality. However, in the solution mentioned in the above patent, the screen is slidably arranged in the outer frame and slides alternately with the first door and window and the second door and window. Since the screen is installed on different surfaces from the first door and window and the second door and window, and is not in the same plane, there is a large installation gap between the two. Mosquitoes can easily enter the room through the installation gap, affecting the mosquito-proof effect of the screen. Summary of the Invention

[0004] The utility model aims to solve the shortcomings of the prior art and to provide a mosquito-proof sliding window.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A mosquito-proof sliding window comprises a horizontally mounted slide, a window sash slidably connected to the slide, and a screen mounted on the front side of the window sash, wherein a sliding mechanism is provided between the window sash and the screen, and is characterized in that:

[0007] The sliding mechanism includes a T-shaped slot provided on the front side of the window sash and a roller provided on the rear side of the screen window, wherein the T-shaped slot is provided in the left-right direction and is slidably connected to the roller; a connecting rod is provided between the roller and the screen window, wherein the front side of the connecting rod is fixedly connected to the screen window, and the rear side of the connecting rod extends into the T-shaped slot and is rotatably connected to the roller;

[0008] The left side of the T-slot is closed and has an embedded hole that matches the roller. The embedded hole extends rearward and is plugged into the roller. The right side of the T-slot is connected to the outside and has a step shoulder extending rearward. The step shoulder is engaged with the screen window, and the window sash is flush with the screen window.

[0009] Preferably, auxiliary wheels are rotatably connected to the upper and lower sides of the screen window, and a wheel track is provided on the front side of the slide groove to be slidably connected to the auxiliary wheels.

[0010] Preferably, a vertically upward limiting plate is provided on the rear side of the wheel rail, and the limiting plate is provided with avoidance holes distributed at intervals, and the avoidance holes are respectively connected to the slide groove and the wheel rail.

[0011] Preferably, the screen window has a buckle extending outward, and a baffle for limiting the screen window is provided on the left side of the window sash. The baffle is provided with an external card slot engaged with the buckle, and the baffle abuts against the screen window.

[0012] Preferably, an inner slot for engaging with a buckle is provided on the left side of the step shoulder, and the step shoulder abuts against the screen window.

[0013] Preferably, a resiliently resettable retractable pin is provided inside the outer card slot and the inner card slot, and the buckle is provided with a pin hole corresponding to the retractable pin, and the retractable pin is plugged into the pin hole.

[0014] Preferably, a vertically mounted frame is provided on the right side of the slide, an anti-collision strip is installed inside the frame, and the anti-collision strip abuts against the screen window.

[0015] Preferably, a stop plate extending to the left is provided inside the frame, the stop plate is flush with the step shoulder, and the roller abuts against the stop plate and the step shoulder.

[0016] Preferably, the stop plate and the step shoulder are provided with a sleeve matching the roller, and the sleeve is extended forward and plugged into the roller.

[0017] The utility model has the following beneficial effects:

[0018] The utility model realizes the flattening and overlapping storage of the screen window by providing a sliding mechanism. Pull the screen window forward, the roller leaves the embedded hole and enters the T-slot, push the screen window to the right until it is misaligned with the window sash, the roller leaves the T-slot and aligns with the step shoulder. By pressing the screen window backward, the step shoulder abuts against the roller and engages with the screen window, the screen window and the window sash are flush with each other, and the screen window is fixed to the right side of the window sash. Since the window sash and the screen window are located on the same plane, the tightness of the installation is improved, and the problem of a large installation gap between the window sash and the screen window when they are installed on different surfaces is overcome, thereby achieving a better mosquito-proofing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembly of the sliding window of the utility model

[0020] Figure 2 This is a schematic diagram of the state of the window sash and screen window described in the utility model Figure 1

[0021] Figure 3 This is a schematic diagram of the state of the window sash and screen window described in the utility model Figure 2

[0022] Figure 4 This is a schematic diagram of the state of the window sash and screen window described in the utility model Figure 3

[0023] Figure 5 This is a schematic diagram of the state of the window sash and screen window described in the utility model Figure 4

[0024] Figure 6 This is a structural diagram of the window sash of the utility model

[0025] Figure 7 This is a structural diagram of the sliding mechanism of the utility model

[0026] Figure 8 This is a schematic diagram of the structure of the chute of the utility model

[0027] Description of the drawings: slide 1, window sash 2, screen 3, T-slot 4, roller 5, connecting rod 6, embedded hole 7, step shoulder 8, auxiliary wheel 9, wheel track 10, limit plate 11, avoidance hole 12, buckle 13, baffle 14, outer slot 15, inner slot 16, telescopic pin 17, frame 18, anti-collision strip 19, stop plate 20, sleeve 21. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Reference Figures 1 to 8 , an embodiment provided by the utility model:

[0030] A sliding window for preventing mosquitoes and insects comprises a horizontally installed slide groove 1, a window sash 2 slidably connected to the slide groove 1, and a screen 3 installed on the front side of the window sash 2, and a sliding mechanism is provided between the window sash 2 and the screen 3: the sliding mechanism comprises a T-slot 4 provided on the front side of the window sash 2, and a roller 5 provided on the rear side of the screen 3, the T-slot 4 is arranged in the left and right directions and is slidably connected to the roller 5; a connecting rod 6 is provided between the roller 5 and the screen 3, the front side of the connecting rod 6 is fixedly connected to the screen 3, the rear side of the connecting rod 6 extends into the T-slot 4, and is rotatably connected to the roller 5; the left side of the T-slot 4 is closed and provided with an embedded hole 7 matching the roller 5, the embedded hole 7 extends rearward and is plugged into the roller 5; the right side of the T-slot 4 is connected to the outside and is provided with a step shoulder 8 extending rearward, the step shoulder 8 is clamped with the screen 3, and the window sash 2 is flush with the screen 3.

[0031] The slide 1 is installed horizontally, set in the left and right directions, and fixed at the window sill. A groove cavity is provided inside the slide 1 for the window sash 2 to slide left and right. The two groove cavities are spaced apart in front and back, and the window sash 2 is installed respectively. The window sash 2 is slidably connected to the slide 1. The screen 3 is installed on the front side of the window sash 2, and slides relative to the window sash 2 and overlaps. The sliding mechanism is located between the window sash 2 and the screen 3. Under the action of the sliding mechanism, the screen 3 can slide in the left and right directions and slide relative to the window sash 2 to achieve the flattening and unfolding of the screen 3; at the same time, the screen 3 can be inserted in the front and back directions and fixedly installed with the window sash 2 to achieve the overlapping storage of the screen 3.

[0032] T-slot 4 is located on the front side of window sash 2, horizontally arranged in the left-right direction. T-slot 4 comprises an inner T-slot and an outer T-slot that are interconnected. The inner T-slot is wider than the outer T-slot. The outer T-slot is located on the surface of window sash 2 and allows for sliding connection of connecting rod 6. The inner T-slot is located inside window sash 2 and allows for sliding connection of roller 5. Roller 5 is located on the rear side of screen 3, rotatably arranged in the vertical direction, and slidably connected to T-slot 4. Connecting rod 6 is located between roller 5 and screen 3. The front side of connecting rod 6 is fixedly connected to screen 3, while the rear side of connecting rod 6 extends into T-slot 4 and is rotatably connected to roller 5.

[0033] The left side of the T-slot 4 is closed, with a buried hole 7 located at the end of the T-slot 4, matching the shape of the roller 5. The buried hole 7 extends rearward and connects to the T-slot 4, with the roller 5 movably plugged into the buried hole 7. When the screen 3 slides to overlap the window sash 2, the roller 5 is located at the end of the T-slot 4 and aligned with the buried hole 7. By pressing the screen 3 backward, the roller 5 leaves the T-slot 4 and inserts into the buried hole 7, so that the screen 3 and the window sash 2 fit together and the screen 3 is fixed to the front side of the window sash 2.

[0034] The right side of the T-slot 4 communicates with the outside, forming an exit for the T-slot 4. A stepped shoulder 8 is located at the exit of the T-slot 4, matching the shape of the screen 3. The stepped shoulder 8 extends rearward and communicates with the T-slot 4, allowing the screen 3 to be flexibly engaged with the stepped shoulder 8. When the screen 3 slides to a position displaced from the window sash 2, the roller 5 moves away from the exit of the T-slot 4 and aligns with the stepped shoulder 8. By pressing the screen 3 backward, the stepped shoulder 8 abuts the roller 5 and engages with the screen 3, aligning the screen 3 with the window sash 2, securing the screen 3 to the right side of the window sash 2.

[0035] To ensure the movable space of the window sash 2, the thickness of the roller 5 is dimension a, the length of the connecting rod 6 is dimension b, and the thickness of the screen 3 is dimension c. Therefore: the depth of the embedded hole 7 is equal to a, the depth of the inner T-slot is equal to a, the depth of the outer T-slot is equal to ba, and the depth of the step shoulder 8 is equal to a+b+c.

[0036] Working principle:

[0037] 1) Under normal conditions, the roller 5 is inserted into the embedded hole 7 to limit the left and right sliding of the screen 3. The screen 3 is fixed to the front side of the window sash 2, and the two fit together. The screen 3 moves with the window sash 2. (See Figure 2 )

[0038] 2) When the screen window 3 is needed, the roller 5 leaves the embedded hole 7 and enters the T-slot 4 by pulling the screen window 3 forward, and the roller 5 slides along the T-slot 4 to push the screen window 3 to the right. The screen window 3 slides to the right side of the window sash 2. (See Figure 3 )

[0039] 3) Until the screen 3 and the window sash 2 are misaligned, the roller 5 leaves the exit of the T-slot 4 and is aligned with the step shoulder 8. By pressing the screen 3 backward, the step shoulder 8 abuts against the roller 5 and is engaged with the screen 3. The screen 3 and the window sash 2 are flush with each other, and the screen 3 is fixed to the right side of the window sash 2, so that the screen 3 is spread out flat. (See Figure 4 、 Figure 5 )

[0040] 4) When the screen window 3 needs to be stored, the screen window 3 is pulled forward, the roller 5 leaves the step shoulder 8 and aligns with the T-slot 4, and the screen window 3 is pushed to the left. The roller 5 slides along the T-slot 4 and the screen window 3 slides to the left side of the window sash 2. (See Figure 4 )

[0041] 5) Until the screen 3 and the window sash 2 overlap, the roller 5 is located at the end of the T-slot 4 and aligned with the embedded hole 7. By pressing the screen 3 backward, the roller 5 leaves the T-slot 4 and is inserted into the embedded hole 7. The screen 3 and the window sash 2 fit together and the screen 3 is fixed to the front side of the window sash 2, realizing the overlapping storage of the screen 3. (See Figure 2 、 Figure 3 )

[0042] The utility model realizes the flattening and overlapping storage of the screen 3 by providing a sliding mechanism. When the screen 3 is pulled forward, the roller 5 leaves the embedded hole 7 and enters the T-slot 4. The screen 3 is pushed to the right until it is misaligned with the window sash 2. The roller 5 leaves the T-slot 4 and aligns with the step shoulder 8. By pressing the screen 3 backward, the step shoulder 8 abuts against the roller 5 and engages with the screen 3. The screen 3 and the window sash 2 are flush with each other, and the screen 3 is fixed to the right side of the window sash 2. Since the window sash 2 and the screen 3 are located on the same plane, the tightness of the installation is improved, and the problem of a large installation gap between the window sash 2 and the screen 3 when they are installed on different surfaces is overcome, thereby achieving a better mosquito-proofing effect.

[0043] In this embodiment, as a preference, auxiliary wheels 9 are rotatably connected to the upper and lower sides of the screen window 3 , and a wheel rail 10 slidably connected to the auxiliary wheels 9 is provided on the front side of the chute 1 .

[0044] The auxiliary wheels 9 are located on the upper and lower sides of the screen 3 and are spaced apart in the left and right directions. The auxiliary wheels 9 are rotatably connected to the screen 3 to provide the screen 3 with a left and right sliding function. The wheel rail 10 is located on the front side of the slide 1 and is arranged side by side with the slide 1. The rear side of the wheel rail 10 is open and connected to the inside of the slide 1. The wheel rail 10 and the auxiliary wheel 9 match each other and are slidably connected. When the screen 3 needs to be used, the screen 3 is pulled forward, the roller 5 leaves the embedded hole 7 and enters the T-slot 4, and the auxiliary wheel 9 moves forward and enters the wheel rail 10. Push the screen 3 to the right, the roller 5 slides along the T-slot 4, and the auxiliary wheel 9 slides along the wheel rail 10, thereby improving the sliding stability and providing support for the screen 3.

[0045] In this embodiment, preferably, a vertically upward limiting plate 11 is provided on the rear side of the wheel rail 10 , and the limiting plate 11 is provided with avoidance holes 12 distributed at intervals, and the avoidance holes 12 are respectively connected to the slide 1 and the wheel rail 10 .

[0046] The limiting plate 11 is located behind the wheel rail 10 and extends vertically upward, partially separating the wheel rail 10 and the chute 1. When the auxiliary wheel 9 slides along the wheel rail 10, the limiting plate 11 limits the auxiliary wheel 9, preventing the auxiliary wheel 9 from separating from the wheel rail 10 and improving sliding stability. Avoidance holes 12 are located on the limiting plate 11 and are spaced apart along the limiting plate 11. The avoidance holes 12 are connected to the chute 1 and the wheel rail 10 respectively. The avoidance holes 12 match the shape and position of the auxiliary wheel 9, and the auxiliary wheel 9 can pass through the avoidance holes 12 in the front-to-back direction. Specifically, when the screen window 3 and the window sash 2 overlap, the avoidance hole 12 and the auxiliary wheel 9 are aligned front to back. By pulling the screen window 3 forward, the auxiliary wheel 9 passes through the avoidance hole 12 and enters the wheel track 10; when the screen window 3 and the window sash 2 are misaligned, the avoidance hole 12 and the auxiliary wheel 9 are aligned front to back. By pressing the screen window 3 backward, the auxiliary wheel 9 passes through the avoidance hole 12 and leaves the wheel track 10, thereby achieving avoidance of the auxiliary wheel 9 and the limit plate 11.

[0047] In this embodiment, as a preference, a buckle 13 extends outward from the screen 3 , and a baffle 14 is provided on the left side of the window sash 2 to limit the screen 3 . The baffle 14 is provided with an outer slot 15 that engages with the buckle 13 , and the baffle 14 abuts against the screen 3 .

[0048] The buckle 13 is located on the left and right sides of the screen 3 and extends outward. The baffle 14 is located on the left side of the window sash 2 and is vertically arranged, corresponding to the position of the screen 3. The external card slot 15 is located in front of the baffle 14 and extends backward, matching the buckle 13. When the screen 3 needs to be stored, the screen 3 is pushed to the left, the roller 5 slides along the T-slot 4, and the screen 3 slides to the left side of the window sash 2 until the baffle 14 abuts against the screen 3 and the screen 3 overlaps with the window sash 2, thereby controlling the sliding stroke of the screen 3. Thereafter, by pressing the screen 3 backward, the roller 5 leaves the T-slot 4 and is inserted into the embedded hole 7, the buckle 13 is engaged with the external card slot 15, the screen 3 and the window sash 2 fit together, and the screen 3 is fixed to the front side of the window sash 2, thereby improving the stability of the installation.

[0049] In this embodiment, as a preference, an inner slot 16 engaged with the buckle 13 is provided on the left side of the step shoulder 8 , and the step shoulder 8 abuts against the screen 3 .

[0050] Internal slot 16 is located to the left of step shoulder 8 and extends rearward, mating with buckle 13. To use screen 3, push screen 3 to the right, causing roller 5 to slide along T-slot 4, sliding screen 3 to the right of window sash 2 until it is misaligned with the sash 2. Subsequently, by pressing screen 3 backward, step shoulder 8 abuts roller 5 and engages screen 3, snapping buckle 13 into internal slot 16, aligning screen 3 with sash 2 and securing it to the right side of sash 2, enhancing installation stability.

[0051] In this embodiment, preferably, an elastically resettable retractable pin 17 is provided inside the outer card slot 15 and the inner card slot 16 , and the buckle 13 is provided with a pin hole corresponding to the retractable pin 17 , and the retractable pin 17 is plugged into the pin hole.

[0052] Retractable pins 17 are located within the outer and inner slots 15, 16, and have an elastic return function. They can be symmetrically positioned above and below the outer and inner slots 15, 16. Pin holes are located outside the buckle 13, matching the shape and position of the retractable pins 17. When the buckle 13 is engaged with the outer and inner slots 15, 16, the retractable pins 17 engage with the pin holes, acting as a position limiter and preventing disengagement.

[0053] In this embodiment, as a preference, a vertically mounted frame 18 is provided on the right side of the chute 1 , an anti-collision strip 19 is installed inside the frame 18 , and the anti-collision strip 19 abuts against the screen 3 .

[0054] The frame 18 is located on the right side of the slide 1 and is installed vertically. It is vertically connected to the slide 1 and aligned with the window sash 2 and the screen 3. The anti-collision strip 19 is embedded in the frame 18 and is made of elastic rubber material. When the screen 3 needs to be used, the screen 3 is pushed to the right, the roller 5 slides along the T-slot 4, and the screen 3 slides to the right side of the window sash 2 until the anti-collision strip 19 abuts against the screen 3, and the screen 3 is misaligned with the window sash 2, thereby controlling the sliding stroke of the screen 3. In addition, the anti-collision strip 19 can be provided with a groove for the screen 3 to be embedded. By pressing the screen 3 backward, the step shoulder 8 abuts against the roller 5 and engages with the screen 3. The screen 3 is engaged with the groove to improve the stability of the installation.

[0055] In this embodiment, preferably, a stop plate 20 extending to the left is provided inside the frame 18 , the stop plate 20 is flush with the step shoulder 8 , and the roller 5 abuts against the stop plate 20 and the step shoulder 8 .

[0056] The stop plate 20 is located within the frame 18, extending leftward and flush with the stepped shoulder 8, providing space for the roller 5 to be installed. To use the screen 3, the screen 3 is pushed rightward, causing the roller 5 to slide along the T-slot 4, sliding the screen 3 to the right of the window sash 2 until the anti-collision strip 19 contacts the screen 3, dislocating the screen 3 from the window sash 2. Subsequently, by pressing the screen 3 backward, the roller 5 on the left side of the screen 3 contacts the stepped shoulder 8, while the roller 5 on the right side of the screen 3 contacts the stop plate 20, thereby controlling the pressing stroke of the screen 3.

[0057] In this embodiment, preferably, the stop plate 20 and the step shoulder 8 are provided with a sleeve 21 that matches the roller 5 , and the sleeve 21 extends forward and is plugged into the roller 5 .

[0058] The sleeve 21 is located between the stop plate 20 and the step shoulder 8, and matches the shape and position of the roller 5. The sleeve 21 is extended forward, and the interior of the sleeve 21 is a hollow structure for plugging with the roller 5. When the screen window 3 needs to be used, the screen window 3 is pushed to the right, and the roller 5 slides along the T-slot 4, and the screen window 3 slides to the right side of the window sash 2 until the anti-collision strip 19 abuts against the screen window 3, and the screen window 3 and the window sash 2 are misaligned. Thereafter, by pressing the screen window 3 backward, the roller 5 on the left side of the screen window 3 abuts against the step shoulder 8 and is inserted into the sleeve 21 located on the step shoulder 8, and the roller 5 on the right side of the screen window 3 abuts against the stop plate 20 and is inserted into the sleeve 21 located on the stop plate 20, thereby improving the stability of the installation.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mosquito-proof sliding window, comprising a horizontally mounted chute, a window sash slidably connected to the chute, and a screen mounted on the front side of the window sash, wherein a sliding mechanism is provided between the window sash and the screen, and characterized in that: The sliding mechanism includes a T-shaped slot provided on the front side of the window sash and a roller provided on the rear side of the screen window, wherein the T-shaped slot is provided in the left-right direction and is slidably connected to the roller; a connecting rod is provided between the roller and the screen window, wherein the front side of the connecting rod is fixedly connected to the screen window, and the rear side of the connecting rod extends into the T-shaped slot and is rotatably connected to the roller; The left side of the T-slot is closed and has an embedded hole that matches the roller. The embedded hole extends rearward and is plugged into the roller. The right side of the T-slot is connected to the outside and has a step shoulder extending rearward. The step shoulder is engaged with the screen window, and the window sash is flush with the screen window.

2. The mosquito-proof sliding window according to claim 1, characterized in that: Auxiliary wheels are rotatably connected to the upper and lower sides of the screen window, and a wheel rail is provided on the front side of the slide groove to be slidably connected to the auxiliary wheels.

3. The mosquito-proof sliding window according to claim 2, characterized in that: A vertically upward limiting plate is provided on the rear side of the wheel rail, and the limiting plate is provided with avoidance holes distributed at intervals, and the avoidance holes are respectively communicated with the slide groove and the wheel rail.

4. The mosquito-proof sliding window according to claim 1, characterized in that: The screen window is provided with a buckle extending outwards, and a baffle for limiting the screen window is provided on the left side of the window sash. The baffle is provided with an outer card slot that is engaged with the buckle, and the baffle abuts against the screen window.

5. The mosquito-proof sliding window according to claim 4, characterized in that: An inner card slot for engaging with the buckle is provided on the left side of the step shoulder, and the step shoulder abuts against the screen window.

6. The mosquito-proof sliding window according to claim 5, characterized in that: The outer card slot and the inner card slot are provided with elastically resettable telescopic pins, the buckle is provided with pin holes corresponding to the telescopic pins, and the telescopic pins are plugged into the pin holes.

7. The mosquito-proof sliding window according to claim 1, characterized in that: A vertically mounted frame is provided on the right side of the slide, an anti-collision strip is installed inside the frame, and the anti-collision strip abuts against the screen window.

8. The mosquito-proof sliding window according to claim 7, characterized in that: A stop plate extending to the left is provided inside the frame, the stop plate is flush with the step shoulder, and the roller abuts against the stop plate and the step shoulder.

9. The mosquito-proof sliding window according to claim 8, characterized in that: The stop plate and the step shoulder are provided with a sleeve that matches the roller. The sleeve is extended forward and plugged into the roller.

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