Door and window installation auxiliary device

Abstract

The utility model discloses an auxiliary device for installing doors and windows. The device comprises a height adjusting supporting walking assembly, a main body support, an adjusting frame and a clamping assembly. The height-adjusting supporting walking assembly is installed on the body support and used for supporting the body support, and rolling wheels are arranged at the bottom of the height-adjusting supporting walking assembly. And a U-shaped concave structure is arranged on the main body bracket. The adjusting frame is in sliding connection with the main body support and can be limited at different positions. A limiting plate located between the first side plate and the second side plate of the U-shaped downwards-concave structure is arranged on the adjusting frame. The clamping assembly is installed on the main body support and used for being matched with the limiting plate to clamp the bottoms of the doors and windows in the clamping area. The door and window installation auxiliary device is designed to be of a strip-shaped two-wheel structure with the small width, and the two ends of the bottom of a door and window are supported through the two door and window installation auxiliary devices respectively; therefore, stable support can be provided for the door and window, and meanwhile the removing difficulty of the door and window installation auxiliary device after the door and window installation is completed is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of door and window installation, and specifically relates to an auxiliary device for door and window installation. Background Art

[0002] In home decoration, doors and windows are mostly installed manually. Workers use wood and tiles to limit the installation position of doors and windows. However, this method makes it difficult to accurately adjust the doors and windows to the ideal height. At the same time, wood, tiles and other limiting objects are difficult to remove after the doors and windows are installed. Violent removal can easily cause damage to the doors and windows.

[0003] In addition, heavy doors and windows are difficult to carry indoors, and require special personnel to support the doors and windows during installation to keep them in an upright position; this makes it difficult for a single worker to complete the installation of doors and windows independently and quickly. Summary of the invention

[0004] The utility model aims to provide a door and window installation auxiliary device.

[0005] The utility model provides a door and window installation auxiliary device, comprising a height-adjusting support walking assembly, a main frame, an adjustment frame and a clamping assembly. The height-adjusting support walking assembly is installed on the main frame to provide support for the main frame, and a roller is provided at the bottom.

[0006] The main frame is provided with a U-shaped concave structure. The U-shaped concave structure has a first side plate, a bottom support plate and a second side plate connected in sequence. The adjustment frame is slidably connected to the main frame and can be locked at different positions. The adjustment frame is provided with a clamping plate between the first side plate and the second side plate.

[0007] A clamping area is formed between the clamping plate and the second side plate of the U-shaped concave structure. The clamping assembly is installed on the main frame and is used to cooperate with the clamping plate to clamp the bottom of the door and window in the clamping area.

[0008] Preferably, the main support comprises a first extension section, a U-shaped concave structure and a second extension section which are connected in sequence. The adjustment frame and the clamping assembly are respectively mounted on the first extension section and the second extension section. The inner end of the first extension section is connected to the top of the first side plate of the U-shaped concave structure. The inner end of the second extension section is connected to the top of the second side plate of the U-shaped concave structure. There are two height-adjusting support walking assemblies. The two height-adjusting support walking assemblies are respectively mounted on the bottom of the outer ends of the first extension section and the second extension section.

[0009] Preferably, each height-adjusting support walking assembly is only provided with one roller.

[0010] Preferably, the first extension section and the second extension section are both arranged horizontally and are in the shape of long flat plates.

[0011] Preferably, the top surface of the first extension section is provided with scale lines arranged along the length direction of the first extension section; the scale lines are used to indicate the width of the clamping area. The guide section of the adjustment frame is provided with a hollow structure corresponding to the scale lines.

[0012] Preferably, the adjustment frame is L-shaped and includes a guide section and a limit section which are perpendicular to each other. The guide section of the adjustment frame is slidably connected to the first extension section of the main support. The clamping plate is arranged on the limit section.

[0013] Preferably, a limiting structure is provided between the main support and the adjustment frame; the limiting structure adopts a plurality of limiting plates of different thicknesses. The clamping plate can be inserted between the clamping plate and the first side plate; the limiting plates of different thicknesses limit the clamping plate to different positions.

[0014] Preferably, a limiting structure is provided between the main support and the adjustment frame; the limiting structure comprises one or more limiting bolts; the limiting bolts are threadedly connected to the threaded holes provided on the first side plate of the U-shaped concave structure, and the ends of the limiting bolts face the clamping plate.

[0015] Preferably, the height-adjusting support walking assembly comprises a screw rod, a locking nut and a universal wheel structure. The universal wheel structure is installed at the bottom of the screw rod. A threaded hole is provided on the main support at a position where the height-adjusting support walking assembly is connected. The screw rod and the corresponding threaded hole form a spiral pair. The locking nut is threadedly connected to the screw rod. During operation, the height of the main support is adjusted by rotating the screw rod, and the relative position of the rotating screw rod and the main support is locked by the locking nut pressing against the main support.

[0016] Preferably, a brake assembly is provided in the universal wheel structure.

[0017] Preferably, the universal wheel structure comprises a mounting block, a rotating frame and a roller. The mounting block is fixed to the bottom end of the screw. The top of the rotating frame and the bottom of the mounting block form a rotating pair. The common axis of the rotating pair formed by the rotating frame and the mounting block is vertically arranged. The roller is rotatably connected to the bottom of the rotating frame.

[0018] Preferably, an anti-skid layer is provided on the front surface of the clamping plate. The anti-skid layer is made of an elastic material with anti-skid stripes or anti-skid bumps on the surface;

[0019] Preferably, a clearance groove is provided on the top of the second side plate. The clamping assembly is installed on the bottom surface of the second extension section and is aligned with the clearance groove on the second side plate. The clamping assembly includes a clamping plate that can slide into the clamping area and lock. The position of the clamping plate is aligned with the clearance groove on the second side plate.

[0020] Preferably, the clamping assembly further comprises a guide block, an extension rod, a mounting seat, a connecting rod and a flip wrench. The mounting seat is fixed to the main support; the guide block is fixed to the back of the second side plate; the extension rod is slidably connected to the guide hole on the guide block. One end of the extension rod is fixed to the back of the clamping plate; the flip wrench comprises an integrally formed flip block and a handle. One end of the flip block is rotatably connected to the mounting seat. The other end of the flip block is rotatably connected to one end of the connecting rod. The other end of the connecting rod is rotatably connected to the end of the extension rod away from the clamping plate.

[0021] Preferably, the mounting seat is provided with a limiting structure for limiting the flip wrench. When the flip wrench is limited by the limiting structure, the clamping plate slides to the position closest to the adjustment frame, and the rotation centers of the extension rod and the connecting rod, the connecting rod and the flip wrench, and the flip wrench and the mounting seat are connected in a straight line.

[0022] Preferably, the main frame is formed by sheet metal; both sides of the first extension section and the second extension section are provided with a reinforcement structure formed by flanging downward; both sides of the first side plate and the second side plate are provided with a reinforcement structure formed by flanging in a direction away from the clamping area.

[0023] The utility model has the following beneficial effects:

[0024] 1. The utility model designs the door and window installation auxiliary device into a strip-shaped two-wheel structure with a smaller width, and uses two door and window installation auxiliary devices to provide support for the two ends of the bottom of the door and window respectively; thereby, while providing stable support for the door and window, it is possible to reduce the difficulty of removing the door and window installation auxiliary device after the door and window installation is completed (the width of the strip-shaped two-wheel structure is smaller, and it is not easy to be blocked by the door frame or wall when taking it out).

[0025] 2. The utility model installs an adjustment frame that can be locked at different positions on the main frame, and cooperates with the clamping assembly, so that the door and window installation auxiliary device can be suitable for the bottom of doors and windows of different thicknesses. At the same time, the utility model provides a scale line on the first extension section, and the scale line indicates the width of the clamping area, so as to improve the adjustment accuracy of the adjustment frame.

[0026] 3. The utility model can adjust the support height of doors and windows, so that the upright doors and windows can be stationary at a height that matches the target installation position, realizing rapid installation by a single worker, thereby overcoming the pain point that the installation of doors and windows requires multiple people to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 It is a top view schematic diagram of the utility model;

[0029] Figure 3 It is a front view schematic diagram of the utility model;

[0030] Figure 4 The schematic diagram of the structure of the clamping assembly in the utility model (ie Figure 3 A partial enlarged view of part A in the figure);

[0031] Figure 5 This is a schematic diagram of the structure of the height-adjusting support walking assembly in the utility model;

[0032] Figure 6 This is a schematic diagram of the vertical support of doors and windows of the utility model. DETAILED DESCRIPTION

[0033] The utility model is further described below.

[0034] Example 1

[0035] like Figure 1 As shown, a door and window installation auxiliary device includes a height-adjusting support walking assembly 1, a main frame 2, an adjustment frame 3 and a clamping assembly 4. Two height-adjusting support walking assemblies 1 are respectively installed below the two ends of the main frame 2. The height-adjusting support walking assembly 1 is used to provide support for the main frame 2, and rollers are provided at the bottom. The height-adjusting support walking assembly 1 can adjust the connection position between itself and the main frame 2, and change the support height of the main frame 2. The width of the main frame 2 is 5cm to 10cm, preferably 8cm.

[0036] like Figure 2 and 3 As shown, the main support 2 includes a first extension section 2-1, a U-shaped concave structure and a second extension section 2-2 which are connected in sequence. The adjustment frame 3 and the clamping assembly 4 are respectively installed on the first extension section 2-1 and the second extension section 2-2. The first extension section 2-1 and the second extension section 2-2 are both horizontally arranged and are in the shape of long flat plates. The U-shaped concave structure has a first side plate 2-3, a bottom support plate 2-4 and a second side plate 2-5 which are connected in sequence. The inner end of the first extension section 2-1 is connected to the top of the first side plate 2-3 of the U-shaped concave structure. The inner end of the second extension section 2-2 is connected to the top of the second side plate 2-5 of the U-shaped concave structure.

[0037] The adjustment frame 3 is L-shaped and includes a guide section 3-1 and a limit section 3-2 which are perpendicular to each other. The guide section 3-1 of the adjustment frame 3 is slidably connected to the first extension section 2-1 of the main frame 2. A vertical clamping plate is provided on the limit section 3-2. The clamping plate is located between the first side plate 2-3 and the second side plate 2-5 of the U-shaped concave structure.

[0038] An adjustment area is formed between the clamping plate and the first side plate 2-3 of the U-shaped concave structure; a clamping area is formed between the clamping plate and the second side plate 2-5 of the U-shaped concave structure. The clamping area is used to limit the bottom of the upright door and window so that the door and window remain in an upright state. By sliding the adjustment frame 3, the width of the adjustment area and the clamping area can be changed.

[0039] The adjustment area between the clamping plate and the first side plate 2-3 is provided with a limiting structure. A through slot is provided at the connection between the guide section 3-1 of the adjustment frame 3 and the limiting section 3-2. The limiting structure adopts a series of limiting plates of different thicknesses. Clamping plates of different thicknesses can be put into the adjustment area between the clamping plate and the first side plate 2-3 through the through slot, so that the limiting plate provides horizontal support to the clamping plate on the limiting section 3-2 to maintain the width of the clamping area unchanged. By replacing limiting plates of different thicknesses, the width of the clamping area can be limited to different values, so that the size of the clamping area can be adapted to doors and windows of different thicknesses.

[0040] A clearance groove is formed on the top of the second side plate 2-5. The clamping assembly 4 is installed on the bottom surface of the second extension section 2-2 and is aligned with the clearance groove on the second side plate 2-5.

[0041] The top surface of the first extension section 2-1 is provided with scale lines 2-6 arranged along the length direction of the first extension section 2-1; the scale lines 2-6 are used to indicate the width of the clamping area. The guide section 3-1 of the adjustment frame 3 is provided with a hollow structure; the hollow structure is used to expose the scale lines 2-6; the edge of the hollow structure matches the scale lines 2-6 to facilitate the user to read. Specifically, the scale value of the scale line 2-6 aligned with the edge of the hollow structure is equal to the width of the current clamping area.

[0042] like Figure 3 and 4 As shown, the clamping assembly 4 includes a clamping plate 4-1, a guide block 4-2, an extension rod 4-3, a mounting seat 4-4, a connecting rod 4-5 and a flip wrench 4-6. The mounting seat 4-4 is fixed to the bottom surface of the second extension section 2-2; the guide block 4-2 is fixed to the back surface of the second side plate 2-5; the extension rod 4-3 is slidably connected to the guide hole on the guide block 4-2, and the sliding direction is parallel to the length direction of the first extension section 2-1 and the second extension section 2-2.

[0043] The side of the clamping plate 4-1 facing the adjustment frame 3 is the front side, and the side away from the adjustment frame 3 is the back side. One end of the extension rod 4-3 is fixed to the back side of the clamping plate 4-1; an anti-skid layer is provided on the front side of the clamping plate 4-1. The anti-skid layer is made of an elastic material with anti-skid stripes or anti-skid bumps on the surface; in this embodiment, the elastic material is specifically rubber. The position of the clamping plate 4-1 is aligned with the clearance slot on the second side plate 2-5, and can pass through the clearance slot.

[0044] The flip wrench 4-6 includes an integrally formed flip block and a handle. One end of the flip block is rotatably connected to the mounting seat 4-4 via a pin. The other end of the flip block is rotatably connected to one end of the connecting rod 4-5 via a pin. The other end of the connecting rod 4-5 is rotatably connected to the end of the extension rod 4-3 away from the clamping plate 4-1 via a pin. The mounting seat 4-4, the clamping plate 4-1, the connecting rod 4-5 and the flip wrench 4-6 constitute a rocker slider mechanism, so that the flipping of the flip wrench 4-6 can drive the clamping plate 4-1 to slide.

[0045] The mounting seat 4-4 is provided with a limiting structure for limiting the flip wrench 4-6. When the flip wrench 4-6 is limited by the limiting structure, the clamping plate 4-1 slides to the position closest to the adjustment frame 3, and the rotation centers of the extension rod 4-3 and the connecting rod 4-5, the connecting rod 4-5 and the flip wrench 4-6, and the flip wrench 4-6 and the mounting seat 4-4 are connected in a straight line, so that the rocker slider mechanism is in a self-locking state. At this time, the clamping assembly 4 is in a clamping state, and the front of the flip block extends into the clamping area.

[0046] During operation, the distance between the clamping plate 4-1 and the adjusting frame 3 in the clamping assembly 4 in the clamping state is equal to or slightly smaller than the bottom thickness of the installed doors and windows, so that the clamping plate 4-1 and the adjusting frame 3 can clamp the installed doors and windows.

[0047] like Figure 5 As shown, the height-adjusting support walking assembly 1 includes a screw 1-1, a locking nut 1-2 and a universal wheel structure 1-3. The universal wheel structure 1-3 is installed at the bottom of the screw 1-1, and includes a mounting block, a rotating frame, a roller and a brake assembly. The mounting block is fixed to the bottom end of the screw 1-1. The top of the rotating frame and the bottom of the mounting block form a rotating pair. The common axis of the rotating pair formed by the rotating frame and the mounting block is vertically arranged. The roller is rotatably connected to the bottom of the rotating frame. The brake assembly is installed on the rotating frame and is used to lock the roller by squeezing the roller.

[0048] The first extension section 2-1 and the second extension section 2-2 are provided with threaded holes at opposite ends. The screw rod 1-1 and the threaded holes on the corresponding first extension section 2-1 or second extension section 2-2 form a screw pair. The locking nut 1-2 is threadedly connected to the screw rod 1-1. The locking nut 1-2 contacts the bottom surface of the corresponding first extension section 2-1 or second extension section 2-2 to form a top nut structure, so that the screw rod 1-1 can stably support the main bracket 2.

[0049] In this embodiment, the main frame 2 is formed by sheet metal; both sides of the first extension section 2-1 and the second extension section 2-2 are provided with a reinforcement structure formed by flanging downwards. Both sides of the first side plate 2-3 and the second side plate 2-5 are provided with a reinforcement structure formed by flanging in a direction away from the clamping area.

[0050] like Figure 6 As shown, the working principle of the door and window installation auxiliary device is as follows:

[0051] Step 1: Prepare two door and window installation auxiliary devices; respectively clip the two ends of the bottom edge of the door and window to be installed into the clamping area (i.e., the U-shaped concave structure);

[0052] Step 2: Flip the flip wrenches 4-6 of the clamping components 4 in the two door and window installation auxiliary devices forward, so that the clamping plate 4-1 and the adjustment frame 3 clamp the bottom of the installed door and window. Release the brake assembly in the universal wheel structure 1-3, and push the door and window supported by the two door and window installation auxiliary devices to the target installation position. The meaning of clamping is to fix the door and window on the door and window installation auxiliary device so that the door and window and the door and window installation auxiliary device will not move relative to each other due to the action of inertia and gravity.

[0053] Step three, use the brake assembly to lock each roller; rotate the locking nut 1-2 to separate the locking nut 1-2 from the corresponding first extension section 2-1 or the second extension section 2-2; turn the screw 1-1 in the height-adjusting support walking assembly 1 to adjust the height of the main bracket 2 of the two door and window installation auxiliary devices so that the height of the installed doors and windows matches the target installation position.

[0054] Step 4: Connect the doors and windows to be installed with the target installation position. After the connection is completed, reversely flip the flip wrenches 4-6 of the clamping components 4 in the two door and window installation auxiliary devices so that the clamping plate 4-1 loosens the bottom of the door and window; use the screw 1-1 to lower the height of the main bracket 2;

[0055] Step 5. After that, move the two door and window installation auxiliary devices horizontally and separate them from the doors and windows to complete the installation of the doors and windows.

[0056] The doors and windows described in this embodiment specifically refer to doors or windows such as flip-type door panels, hanging rail sliding doors and flip-type window panels, which do not need to be integrally connected to the track structure at the bottom.

[0057] Example 2

[0058] A door and window installation auxiliary device; the difference between this embodiment and embodiment 1 is that: the structure of the limiting structure between the clamping plate and the first side plate 2-3 is different; in this embodiment, the limiting structure includes one or more limiting bolts; the limiting bolts are threadedly connected with the threaded holes provided on the first side plate 2-3 of the U-shaped concave structure. The end of the limiting bolt faces the clamping plate. The head of the limiting bolt is located on the side of the first side plate 2-3 away from the clamping plate.

[0059] By rotating the limit bolt, the adjustment frame 3 can be pushed to slide toward the second side plate 2-5, thereby reducing the width of the clamping area; at the same time, the limit bolt can provide lateral support for the clamping plate of the adjustment frame 3. The end of the limit bolt is fixedly or rotatably connected with an elastic support block. The elastic support block is made of rubber material to prevent the limit bolt from damaging the limit plate during long-term use.

[0060] Compared with Embodiment 1, this embodiment can realize stepless adjustment of the width of the clamping area.

[0061] In some embodiments, a gripping handle is provided on the head of the limiting bolt to facilitate the user to manually rotate the limiting bolt.

[0062] In some embodiments, a locking nut is provided on the limit bolt to prevent the limit bolt from rotating due to vibration during the transportation and installation of doors and windows through a top nut structure.

[0063] Example 3

[0064] A door and window installation auxiliary device; the difference between this embodiment and embodiment 1 is that the structure of the limiting structure between the clamping plate and the first side plate 2-3 is different; in this embodiment, the limiting structure adopts a fixing screw connected between the adjustment frame 3 and the first extension section 2-1.

Claims

1. A door and window installation auxiliary device, characterized in that: It comprises a height-adjusting support and walking assembly (1), a main frame (2), an adjustment frame (3) and a clamping assembly (4); the height-adjusting support and walking assembly (1) is installed on the main frame (2) to provide support for the main frame (2), and a roller is provided at the bottom; The main frame (2) is provided with a U-shaped concave structure; the U-shaped concave structure comprises a first side plate (2-3), a bottom support plate (2-4) and a second side plate (2-5) which are connected in sequence; the adjustment frame (3) is slidably connected to the main frame (2) and can be limited to different positions; the adjustment frame (3) is provided with a clamping plate located between the first side plate (2-3) and the second side plate (2-5); A clamping area is formed between the clamping plate and the second side plate (2-5) of the U-shaped concave structure; the clamping assembly (4) is installed on the main frame (2) and is used to cooperate with the clamping plate to clamp the bottom of the door and window in the clamping area.

2. A door and window installation auxiliary device according to claim 1, characterized in that: The main frame (2) comprises a first extension section (2-1), a U-shaped concave structure and a second extension section (2-2) which are connected in sequence; the adjustment frame (3) and the clamping assembly (4) are respectively mounted on the first extension section (2-1) and the second extension section (2-2); the inner end of the first extension section (2-1) is connected to the top of the first side plate (2-3) of the U-shaped concave structure; the inner end of the second extension section (2-2) is connected to the top of the second side plate (2-5) of the U-shaped concave structure; there are two height-adjusting support walking assemblies (1); the two height-adjusting support walking assemblies (1) are respectively mounted on the outer end bottoms of the first extension section (2-1) and the second extension section; each height-adjusting support walking assembly (1) is only provided with one roller.

3. A door and window installation auxiliary device according to claim 2, characterized in that: The top surface of the first extension section (2-1) is provided with scale lines (2-6) arranged along the length direction of the first extension section (2-1); the scale lines (2-6) are used to indicate the width of the clamping area; and the guide section (3-1) of the adjustment frame (3) is provided with a hollow structure corresponding to the scale lines (2-6).

4. A door and window installation auxiliary device according to claim 2, characterized in that: The adjustment frame (3) is L-shaped and comprises a guide section (3-1) and a limit section (3-2) which are perpendicular to each other; the guide section (3-1) of the adjustment frame (3) is slidably connected to the first extension section (2-1) of the main frame (2); and the clamping plate is arranged on the limit section (3-2).

5. The door and window installation auxiliary device according to claim 2, characterized in that: The main support is formed by sheet metal; both sides of the first extension section and the second extension section are provided with a reinforcement structure formed by downward flanges; both sides of the first side plate and the second side plate are provided with a reinforcement structure formed by flanges in a direction away from the clamping area.

6. The door and window installation auxiliary device according to claim 1, characterized in that: A limiting structure is provided between the main support (2) and the adjustment frame (3); the limiting structure adopts a plurality of limiting plates of different thicknesses; the clamping plate can be inserted between the clamping plate and the first side plate (2-3); and limiting plates of different thicknesses limit the clamping plate to different positions.

7. The door and window installation auxiliary device according to claim 1, characterized in that: A limiting structure is provided between the main support (2) and the adjustment frame (3); the limiting structure comprises one or more limiting bolts; the limiting bolts are threadedly connected to threaded holes provided on the first side plate (2-3) of the U-shaped concave structure; the end of the limiting bolt faces the clamping plate; and an elastic support block is provided at the end of the limiting bolt.

8. The door and window installation auxiliary device according to claim 1, characterized in that: The height-adjustable support walking assembly (1) comprises a screw rod (1-1), a locking nut (1-2) and a universal wheel structure (1-3); the universal wheel structure (1-3) is installed at the bottom of the screw rod (1-1); a threaded hole is provided at a position on the main frame (2) connected to the height-adjustable support walking assembly (1); the screw rod (1-1) and the corresponding threaded hole form a spiral pair; the locking nut (1-2) is threadedly connected to the screw rod (1-1); during operation, the height of the main frame (2) is adjusted by rotating the screw rod (1-1), and the relative position of the rotating screw rod (1-1) and the main frame (2) is locked by the locking nut (1-2) pressing against the main frame (2).

9. The door and window installation auxiliary device according to claim 1, characterized in that: A clearance groove is provided on the top of the second side plate (2-5); the clamping assembly (4) is installed on the bottom surface of the second extension section (2-2) and is aligned with the clearance groove on the second side plate (2-5); the clamping assembly (4) comprises a clamping plate (4-1) that can slide into the clamping area and lock; the position of the clamping plate (4-1) is aligned with the clearance groove on the second side plate (2-5); an anti-skid layer is provided on the front surface of the clamping plate (4-1); the anti-skid layer is made of an elastic material with anti-skid stripes or anti-skid bumps on the surface.

10. The door and window installation auxiliary device according to claim 1, characterized in that: The clamping assembly (4) further comprises a guide block (4-2), an extension rod (4-3), a mounting seat (4-4), a connecting rod (4-5) and a flip wrench (4-6); the mounting seat (4-4) is fixed on the main support (2); the guide block (4-2) is fixed on the back side of the second side plate (2-5); the extension rod (4-3) is slidably connected to the guide hole on the guide block (4-2); one end of the extension rod (4-3) is fixed to the back side of the clamping plate (4-1); the flip wrench (4-6) comprises an integrally formed flip block and a handle; one end of the flip block is rotatably connected to the mounting seat (4-4); the other end of the flip block is rotatably connected to one end of the connecting rod (4-5); the other end of the connecting rod (4-5) is rotatably connected to the end of the extension rod (4-3) away from the clamping plate (4-1).

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