Locking device of multifunctional angle square

Abstract

A locking device of a multifunctional angle square comprises a ruler piece and a ruler seat, the ruler seat is an aluminum alloy seat, the locking device is installed on the ruler seat and comprises a locking rod and a locking switch, a sliding groove is formed in the upper end of the ruler seat, the ruler piece can be inserted into the sliding groove and slide leftwards and rightwards in the sliding groove, and a guide groove is formed in one side of the ruler piece in the length direction. A through hole communicated with the sliding groove is vertically formed in the ruler base, the upper end of the locking rod penetrates through the through hole to be inserted into the sliding groove and is in sliding fit with the guide groove of the ruler piece through a locking block, an eccentric hole is formed in the locking switch, and the lower end of the locking rod extends out of the through hole to be connected with the eccentric hole of the locking switch through a pin shaft. The locking rod is driven to move up and down through the eccentric hole, so that the locking block and the guide groove abut against each other for locking or unlocking, and a limiting structure is arranged between the locking rod and the through hole. The device is simple and reasonable in structure and convenient and fast to operate, the working efficiency is effectively improved, and meanwhile the service life is greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring tools, and relates to a multifunctional angle ruler, in particular to a locking device for a multifunctional angle ruler. Background Art

[0002] A multifunctional angle ruler is a measuring tool that can perform multi-angle measurements, such as measuring 90-degree internal and external right angles, 45-degree inclined planes, 180-degree horizontal planes, etc. Multifunctional angle rulers are widely used in the woodworking industry and are deeply loved by carpenters. A multifunctional angle ruler generally includes a ruler blade and an aluminum alloy base. Generally, on the market, a nut and screw rod pressing method is used to fix the ruler blade, as shown in Figure 1 、 2 This fixing method has the following defects: when in a non-working state, once the ruler blade is pulled out, since the nut and screw rod B are not limited, the nut and screw rod B will separate from the aluminum alloy base. After long-term use, the nut and screw rod will be lost, resulting in the direct inability to use this multifunctional angle ruler, and its service life is relatively short. In addition, the existing multifunctional angle ruler is relatively cumbersome to operate and has low work efficiency.

[0003] After investigation, the Chinese patent "A Multifunctional Angle Ruler" with the patent application number CN201020177509.0 includes a ruler body and a ruler base. A vertically arranged sliding groove is opened on the ruler base, and the ruler body can be slid up and down in the sliding groove. The ruler base is also provided with a locking structure for locking the ruler body in the sliding groove. The locking structure includes a locking nut and a pull rod. When in use, the ruler body slides down so that a part of it is exposed outside the lower side of the ruler base, and it is locked through the locking structure, so that the working surfaces on the upper and lower sides of the ruler base can be simultaneously surveyed and mapped. In addition, the locking structure is loosened so that the ruler body can slide up and down freely. The locking structure of this multifunctional angle ruler uses the method of a nut and pull rod. Since a slider is provided at the front end of the pull rod, it plays a limiting role to prevent the pull rod from separating from the ruler base. However, the method of the nut and pull rod is not convenient enough to operate and has low work efficiency. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a locking device for a multifunctional angle ruler with a simple and reasonable structure and convenient operation in view of the above technical status.

[0005] The technical solution adopted by the present utility model to solve the above technical problems is as follows: A locking device for a multi-functional angle ruler. The multi-functional angle ruler includes a ruler blade and a ruler base. The ruler base is an aluminum alloy base, and the locking device is installed on the ruler base. It is characterized in that: The locking device includes a locking rod and a locking switch. A chute for inserting and sliding the ruler blade left and right is opened at the upper end of the ruler base. A guiding groove is formed along the length direction on one side of the ruler blade. A through hole communicating with the chute is vertically opened on the ruler base. The upper end of the locking rod passes through the through hole and is inserted into the chute, and is slidably matched with the guiding groove of the ruler blade through a locking block. An eccentric hole is provided on the locking switch. The lower end of the locking rod extends out of the through hole and is connected to the eccentric hole of the locking switch through a pin shaft. When the locking switch is rotated, the locking rod is driven to move up and down through the eccentric hole, so that the locking block tightly abuts against the guiding groove to lock or unlock. A limiting structure is provided between the locking rod and the through hole.

[0006] As an improvement, the part of the upper end of the locking rod inserted into the chute is L-shaped. The upper end of the locking rod is folded inward to form a locking block that cooperates with the guiding groove. The thickness of the locking block is less than the width of the guiding groove.

[0007] Further, the limiting structure between the locking rod and the through hole is specifically: A limiting groove is recessed perpendicular to the pressing surface of the ruler blade in the middle of the locking rod. A positioning pin is provided in the limiting groove and fixed to the ruler base. The locking rod is movably arranged up and down in the through hole and is limited by the cooperation of the limiting groove and the positioning pin.

[0008] Still further, the limiting groove is a square groove, a trapezoidal groove or a circular groove, and an annular groove can also be used.

[0009] Further, the locking switch is divided into upper and lower parts. The upper part is a connecting part rotatably connected to the locking rod, and the lower part is a handle part. The connecting part includes two circular connecting plates on the left and right. A U-shaped groove for inserting the lower end of the locking rod is formed between the two connecting plates. Symmetric eccentric holes are opened on the two connecting plates. Corresponding pin holes are provided at the lower end of the locking rod. The locking switch is rotatably connected to the locking rod through a pin shaft.

[0010] Still further, at least two limiting surfaces corresponding to the working state and the unlocking state are provided on the outer peripheral surface of the connecting plate. A gasket is sleeved on the lower part of the locking rod. The upper end of the gasket abuts against the lower end of the through hole, and the lower end of the gasket abuts against the limiting surface of the locking switch.

[0011] Still further, the limiting surface is a flat surface or a stepped surface, or the two connecting plates of the upper connecting part of the locking switch are designed as polygons or ellipses.

[0012] Finally, slot holes for installing a bubble level and jacks for inserting a marking pen are opened in the middle and side of the lower end surface of the ruler base. The bubble level is installed in the slot hole and fixed through a bubble level plug.

[0013] Compared with the prior art, the advantages of the utility model are: a locking rod and a locking switch are adopted, the locking switch is provided with an eccentric hole, and is connected to the locking rod through an axle pin, so that the locking rod can be controlled to move up and down by turning the locking switch, thereby realizing the locking and unlocking of the ruler, and the operation is very convenient; a limiting structure is provided between the locking rod and the ruler seat, and the locking rod is limited to ensure that the locking rod will not be separated from the ruler seat when the ruler is taken out; a limiting surface is provided on the locking switch, so that the positioning is more stable. The utility model has a simple and reasonable structure, is convenient and quick to operate, effectively improves work efficiency, and greatly improves service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of a traditional multifunctional angle ruler;

[0015] Figure 2 This is a schematic diagram of the structure of the embodiment of the utility model when the blade is locked;

[0016] Figure 3 for Figure 1 A cross-sectional view of

[0017] Figure 4 This is a schematic diagram of the structure of the embodiment of the utility model when the ruler is unlocked;

[0018] Figure 5 for Figure 4 A cross-sectional view of

[0019] Figure 6 This is a structural exploded view of an embodiment of the utility model;

[0020] Figure 7 for Figure 6 Enlarged view of the middle locking switch;

[0021] Figure 8 for Figure 6 Enlarged view of the middle locking lever;

[0022] Figure 9 It is a schematic diagram of the structure after the locking switch and the locking rod are assembled;

[0023] Figure 10 It is a schematic diagram of the structure of a locking switch with multiple limit surfaces;

[0024] Figure 11 for Figure 10 The main view;

[0025] Figure 12 The schematic diagram of the structure shows that the limiting groove of the locking rod is an annular groove. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 12 As shown, a locking device of a multifunctional angle ruler is shown. The multifunctional angle ruler comprises a ruler blade 1 and a ruler seat 2. The ruler seat 2 is an aluminum alloy seat. The locking device A is installed on the ruler seat 2. The locking device A comprises a locking rod 4 and a locking switch 3. A slide groove 21 is provided at the upper end of the ruler seat 2 for the ruler blade 1 to be inserted and slide left and right. A guide groove 11 is formed on one side of the ruler blade 1 along the length direction. A through hole 22 connected with the slide groove 21 is vertically provided on the ruler seat 2. The upper end of the locking rod 4 is inserted into the slide groove 21 through the through hole 22 and slides with the guide groove 11 of the ruler blade 1 through a locking block 42. An eccentric hole 31 is provided on the locking switch 3. The lower end of the locking rod 4 extends out of the through hole 22 and is connected to the eccentric hole 31 of the locking switch 3 through a pin shaft 6. When the locking switch 3 is rotated, the locking rod 4 is driven to move up and down through the eccentric hole 31, so that the locking block 42 is tightly pressed against the guide groove 11 for locking or unlocking. A limiting structure is provided between the locking rod 4 and the through hole 22.

[0028] The specific structure is as follows: the upper end of the locking rod 4 is inserted into the slide groove 21 and is L-shaped. The upper end of the locking rod 4 is folded inward to form a locking block 42 that cooperates with the guide groove 11. The thickness of the locking block 42 is less than the width of the guide groove 11. The limiting structure between the locking rod 4 and the through hole 22 is as follows: the middle part of the locking rod 4 is vertically provided with a limiting groove 41 concavely arranged on the pressing surface of the blade 1. The limiting groove 41 of this embodiment is a square groove. A locating pin 5 is arranged in the limiting groove 41 to be fixed to the blade seat 2. The locking rod 4 is movably arranged in the through hole 22 and is limited by the cooperation of the limiting groove 41 and the locating pin 5. In this way, the up and down displacement of the locking rod 4 is limited by the locating pin 5. After the blade 1 is removed, the locking rod 4 will not be separated from the blade seat 2. The locking switch 3 is divided into two parts, the upper part is a connection part that is rotatably connected to the locking rod 4, and the lower part is a handle part. The connection part includes two circular connection plates 32 on the left and right. A U-shaped groove is formed between the two connection plates 32 for inserting the lower end of the locking rod 4. Symmetrical eccentric holes 31 are opened on the two connection plates 32. The lower end of the locking rod 4 is provided with a corresponding pin hole. The locking switch 3 is rotatably connected to the locking rod 4 through the pin shaft 6. At least two limit surfaces 33 corresponding to the working state and the unlocking state are provided on the outer peripheral surface of the connection plate 32. In this embodiment, there are two limit surfaces 33, such as Figure 7 The limiting surface 33 is provided to switch between the unlocking state and the working state. The lower part of the locking rod 4 is sleeved with gaskets 7 and 8, which are made of stainless steel gasket 7 and polyurethane gasket 8. The upper ends of the gaskets 7 and 8 abut against the lower end of the through hole 22, and the lower ends of the gaskets 7 and 8 abut against the limiting surface of the locking switch 3.

[0029] A slot hole for installing a water bubble 9 and a plug hole for inserting a marking pen 10 are provided in the middle and side parts of the lower end surface of the ruler base 2. The water bubble 9 is installed in the slot hole and fixed by a water bubble plug 90.

[0030] The limit groove 41 on the locking rod 4 is not limited to a square groove, and can also be a trapezoidal groove, a circular groove or an annular groove (such as Figure 12 ).

[0031] The limit surfaces 33 on the locking switch 3 can be multiple, such as Figure 10 , 11 shown. There are 4 limit surfaces 33; the limit surfaces 33 are flat surfaces, and can also be stepped surfaces, or the two connecting plates 33 of the upper connecting part of the locking switch 4 are designed as polygons or ellipses.

[0032] The working principle is as follows: The locking rod 4 and the locking switch 3 are connected by a shaft pin 6. The shaft pin hole of the locking switch 3 is an eccentric hole 31. In the working state, rotate the locking switch 3 counterclockwise, such as Figure 2 , 3 , the locking rod 4 moves upward to achieve locking with the scale piece 1. In the unlocking state, rotate the locking switch 3 clockwise, such as Figure 4 , 5 , the locking rod 4 moves downward to achieve unlocking with the scale piece 1. Since the locking switch 3 is provided with limit surfaces 33, the positioning can be easily switched.

[0033] The operation only needs to rotate the locking switch 3 to complete, which is very labor-saving and convenient.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A locking device for a multifunctional angle ruler, the multifunctional angle ruler comprising a ruler blade and a ruler seat, the ruler seat being an aluminum alloy seat, the locking device being mounted on the ruler seat, characterized in that: The locking device includes a locking rod and a locking switch. A sliding groove is provided at the upper end of the ruler seat for the ruler blade to be inserted and slide left and right. A guide groove is formed on one side of the ruler blade along the length direction. A through hole connected to the sliding groove is vertically provided on the ruler seat. The upper end of the locking rod is inserted into the sliding groove through the through hole and slides with the guide groove of the ruler blade through the locking block. An eccentric hole is provided on the locking switch. The lower end of the locking rod extends out of the through hole and is connected to the eccentric hole of the locking switch through a pin shaft. When the locking switch is turned, the locking rod is driven up and down through the eccentric hole, so that the locking block and the guide groove are tightly pressed against each other for locking or unlocking. A limiting structure is provided between the locking rod and the through hole.

2. The locking device according to claim 1, characterized in that: The portion of the upper end of the locking rod inserted into the slide groove is L-shaped, and the upper end of the locking rod is folded inwardly to form a locking block that cooperates with the guide groove, and the thickness of the locking block is smaller than the width of the guide groove.

3. The locking device according to claim 2, characterized in that: The limiting structure between the locking rod and the through hole is specifically as follows: a limiting groove is concavely provided in the middle part of the locking rod perpendicular to the clamping surface of the ruler, a certain direction pin is provided in the limiting groove to fix it with the ruler seat, and the locking rod can be movably arranged in the through hole up and down, and is limited by the cooperation of the limiting groove and the positioning pin.

4. The locking device according to claim 3, characterized in that: The limiting groove is a square groove, a trapezoidal groove, a circular groove or an annular groove.

5. The locking device according to claim 3, characterized in that: The locking switch is divided into two parts, the upper part is a connecting part rotatably connected to the locking rod, and the lower part is a handle part. The connecting part includes two circular connecting plates on the left and right. A U-shaped groove is formed between the two connecting plates for inserting the lower end of the locking rod. Symmetrical eccentric holes are opened on the two connecting plates. The lower end of the locking rod is provided with a corresponding pin hole. The locking switch is rotatably connected to the locking rod through a pin shaft.

6. The locking device according to claim 5, characterized in that: The outer circumferential surface of the connecting plate is provided with at least two limit surfaces corresponding to the working state and the unlocking state. The lower part of the locking rod is sleeved with a gasket, the upper end of the gasket abuts against the lower end of the through hole, and the lower end of the gasket abuts against the limit surface of the locking switch.

7. The locking device according to claim 6, characterized in that: The limiting surface is a plane or a step surface, or the two connecting plates of the upper connecting part of the locking switch are designed to be polygonal or elliptical.

8. The locking device according to any one of claims 1 to 7, characterized in that: A slot hole for installing a water bubble and a plug hole for inserting a marking pen are provided in the middle and side parts of the lower end surface of the ruler seat. The water bubble is arranged in the slot hole and fixed by a water bubble plug.

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