Compasses capable of quickly locking pitch

Abstract

The utility model discloses a pair of compasses capable of quickly locking a foot pitch, which comprises a compasses head, a positioning foot and a rotating foot, the positioning foot and the rotating foot are oppositely hinged on the compasses head, the compasses head is provided with a lock head capable of turning over relative to the compasses head, and an eccentric cam is formed on the lock head. The eccentric cam is arranged on the lock head, the cam wall of the eccentric cam can gradually extrude the top of the positioning foot and the top of the rotating foot in the overturning process of the lock head, when the positioning foot and the rotating foot with the adjusted foot pitch need to be locked, we only need to drive the lock head to overturn with one hand, and then the positioning foot and the rotating foot can be rapidly fixed to the compass head. Therefore, the distance between the positioning foot and the rotating foot can be locked instantly, the defect that in the prior art, locking or unlocking of the foot pitch can be achieved only by continuously rotating a locking knob is overcome, the adjusting operation of the foot pitch of the compasses is more convenient and rapid, and the use efficiency of the compasses is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of stationery, in particular to a compass capable of quickly locking foot distances. Background Art

[0002] In mathematics and drawing, a compass is a tool used to draw circles or chords, and is often used in ruler and compass drawing. When using a compass, the two legs of the compass need to be opened to the required distance. The above distance refers to the distance between the free ends of the two compass legs. Then, pinch the compass head to draw a circle. If the two legs of the compass are not locked, relative displacement may occur, resulting in failure to draw a circle. The earliest compass solved the above problem by increasing the preload force of the compass head. However, when the preload force is too large, the adjustment process of the compass is also more laborious. Some people directly control the opening and closing of the compass legs by adding external structures to lock the distance. The most common method is to open threaded holes on the two compass legs and then add an additional screw. By passing the screw through the threaded holes on the two compass legs in turn, the bite force of the screw and the threaded hole is used to achieve the displacement of the two legs of the compass. The disadvantage of this compass is that the adjustment cannot be made by directly opening the compass legs, but needs to be achieved by turning the screw, resulting in slower adjustment and unchanged operation.

[0003] In response to this situation, the Chinese utility model patent application number CN 202021168253.7 (authorization announcement number CN212889621U) discloses "A compass with a compass head locking device", which includes a positioning compass foot and a rotating compass foot. The top ends of the positioning compass foot and the rotating compass foot are rotatably connected through the compass head. A locking device is provided on the compass head. The locking device includes a locking top block and a locking knob threadedly connected to the compass rotating head. The locking knob is rotated to drive the locking top block to press down and then support the tops of the two compass feet, thereby achieving the purpose of locking the compass feet. Its shortcoming is that the locking knob on the compass used to lock the compass feet is also threadedly connected to the compass rotating head. When the operator adjusts the distance, he must continuously rotate the locking knob to achieve locking. Therefore, the purpose of quick locking cannot be completely achieved, and further improvement is needed.

[0004] Therefore, how to provide a compass that can quickly lock the foot distance and make the locking action more convenient is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a compass capable of quickly locking the foot distance and making the locking action more convenient in view of the above technical status quo.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is as follows: The compass capable of quickly locking the foot distance includes a compass head, a positioning foot, and a rotating foot. The positioning foot and the rotating foot are relatively hinged on the compass head. A lock head capable of flipping relative to the compass head is provided on the compass head. An eccentric cam is formed on the lock head. The cam wall of the eccentric cam can squeeze the tops of the positioning foot and the rotating foot during the flipping process of the lock head, so that the positioning foot and the rotating foot with the adjusted foot distance are locked on the compass head.

[0007] In order to enable the eccentric cam on the lock head to better squeeze the positioning foot and the rotating foot to achieve locking, preferably, a pressing block is further provided between the lock head and the positioning foot and the rotating foot. The pressing block can be pressed against the tops of the positioning foot and the rotating foot under the squeezing action of the eccentric cam, so that the positioning foot and the rotating foot are locked on the compass head.

[0008] In order to enable the positioning foot and the rotating foot to rotate synchronously to facilitate the adjustment of the foot distance, preferably, teeth that can mesh with each other during relative rotation are provided on the tops of the positioning foot and the rotating foot. An arc-shaped concave surface adapted to the eccentric cam is formed on the top of the pressing block, and a pressing portion adapted to the teeth is formed on the bottom of the pressing block.

[0009] In order to enable the pressing block to better squeeze the teeth to lock the positioning foot and the rotating foot, preferably, a groove extending circumferentially is provided at the teeth, and a flange adapted to be fitted in the groove is formed on the pressing portion.

[0010] In order to prevent the pressing block from shifting laterally, preferably, a fixing column for preventing the pressing block from deviating laterally is further provided in the compass head, and a through hole for the fixing column to pass through up and down is provided on the pressing block.

[0011] In order to facilitate driving the compass head to rotate, preferably, a rotating handle extending upward for controlling the rotation of the compass is formed on the compass head, a locking handle adapted to the rotating handle is formed on the lock head. When the lock head is in the locked state, the locking handle can be turned up and attached to the side of the rotating handle to jointly form a complete handle. By pulling the locking handle down to turn it over, the lock head can be unlocked from the positioning foot and the rotating foot. A first slot for the flipping movement of the locking handle is also provided on the compass head.

[0012] In order to enable the formed handle to form a cylinder for convenient rotation control, preferably, the cross sections of the locking handle and the rotating handle are both semi-circular and adapted to each other.

[0013] In order to quickly control the downward flipping of the locking handle, preferably, inclined surfaces or arc surfaces inclined towards the joint are formed at the ends of the locking handle and the rotating handle, so that a concave portion for easily controlling the downward flipping of the locking handle is formed at the top of the handle.

[0014] In order to optimize the overall structure of the compass head so that the positioning foot, the rotating foot and the locking head can be better installed on the compass head, preferably, the compass head includes a first compass head and a second compass head that are adapted to each other. The locking head is built in the space formed by the enclosure of the first compass head and the second compass head. A pin shaft for the locking head to flip and hinge is provided between the first compass head and the second compass head. At least two second fasteners penetrating horizontally are further provided between the first compass head and the second compass head. The positioning foot and the rotating foot are hinged on the corresponding second fasteners.

[0015] In order to better arrange the fixing column in the compass head, preferably, a fixing sleeve extending downward is provided on the pin shaft. The fixing column passes through the extrusion block from bottom to top and is connected to the fixing sleeve. A second slot is also formed on the locking head to avoid interference with the fixing sleeve when the locking head flips.

[0016] Compared with the prior art, the advantages of the present utility model are as follows: By providing a locking head on the compass head that can flip relative to the compass head, an eccentric cam is further formed on the locking head, and the cam wall of the eccentric cam can gradually squeeze the tops of the positioning foot and the rotating foot during the flipping process of the locking head. When it is necessary to lock the positioning foot and the rotating foot with the foot distance adjusted, we only need to drive the locking head to flip with one hand, and the positioning foot and the rotating foot can be quickly fixed on the compass head, so that the distance between the positioning foot and the rotating foot can be instantly locked, avoiding the disadvantage in the prior art that it is necessary to continuously rotate the locking knob to lock or release the foot distance, making the adjustment operation of the compass foot distance more convenient and fast, and greatly improving the use efficiency of the compass. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structure diagram of this embodiment (the positioning foot and the rotating foot are in the open state);

[0018] Figure 2 is a three-dimensional structure diagram of this embodiment (the positioning foot and the rotating foot are in the closed state);

[0019] Figure 3 is an exploded state structure diagram of this embodiment;

[0020] Figure 4 is a three-dimensional structure diagram of this embodiment when the lock handle is in the downward flipping and unlocking state;

[0021] Figure 5 is a sectional structure diagram of this embodiment (the lock handle is in the upward flipping and locking state);

[0022] Figure 6 is a sectional structure diagram of this embodiment (the lock handle is in the downward flipping and unlocking state). DETAILED DESCRIPTION OF THE EMBODIMENT

[0023] The following further describes the present utility model in detail with reference to the embodiments and drawings.

[0024] Figures 1 to 6 The following is a schematic diagram of this embodiment. The compass capable of quickly locking the foot spacing in this embodiment mainly includes a compass head 1, a positioning foot 2, a rotating foot 3, a lock head 4, a pressing block 5, etc.

[0025] Refer to Figures 1 to 3 As shown, the positioning foot 2 and the rotating foot 3 are hinged to the compass head 1 in a relative state. A lock head 4 that can flip relative to the compass head 1 is provided on the compass head 1. An eccentric cam 4a is formed on the lock head 4. The cam wall 4a1 of the eccentric cam 4a can squeeze the tops of the positioning foot 2 and the rotating foot 3 during the flipping process of the lock head 4, so that the positioning foot 2 and the rotating foot 3 with the adjusted foot spacing are locked on the compass head 1.

[0026] Among them, in order to enable the eccentric cam 4a on the lock head 4 to better squeeze the positioning foot 2 and the rotating foot 3 to achieve mutual locking, refer to Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, a pressing block 5 is also specially provided between the lock head 4 and the positioning foot 2 and the rotating foot 3. Under the squeezing action of the eccentric cam 4a, the pressing block 5 can be pressed tightly on the tops of the positioning foot 2 and the rotating foot 3, so that the positioning foot 2 and the rotating foot 3 are locked on the compass head 1. The pressing block 5 here can be made of a slightly soft material such as TPE plastic, so as to achieve better squeezing.

[0027] Secondly, in order to enable the positioning foot 2 and the rotating foot 3 to rotate synchronously to facilitate the adjustment of the foot spacing between the positioning foot 2 and the rotating foot 3, refer to Figure 3 As shown, in this embodiment, teeth 6 that can mesh with each other when the positioning foot 2 and the rotating foot 3 rotate relative to each other are specially provided on the tops of the positioning foot 2 and the rotating foot 3, and an arc-shaped concave surface 5a adapted to the eccentric cam 4a is formed on the top of the pressing block 5. A pressing part 5b adapted to the teeth 6 is also formed at the bottom of the pressing block 5.

[0028] Furthermore, in order to enable the pressing block 5 to better squeeze the teeth 6 to lock the positioning foot 2 and the rotating foot 3, refer to Figure 3 As shown, in this embodiment, a circumferentially extending groove 6a is provided at the teeth 6, and a flange 5b1 adapted to be fitted in the groove 6a is formed on the pressing part 5b. Through the squeezing fit of the groove 6a and the flange 5b1, the pressing part 5b can better lock the positioning foot 2 and the rotating foot 3.

[0029] In addition, in order to prevent the pressing block 5 from shifting laterally, refer to Figure 3 , and Figure 5 and Figure 6As shown, in this embodiment, a fixing post 7 is specifically provided inside the compass head 1 to prevent the pressing block 5 from deviating laterally. The pressing block 5 is provided with a through hole 5c for the fixing post 7 to pass through vertically. The fixing post 7 and the through hole 5c limit each other to prevent the pressing block 5 from shifting laterally.

[0030] In this embodiment, in order to facilitate driving the entire compass to rotate around the axis of the positioning foot 2, refer to Figures 2 to 4 As shown, at the top of the compass head 1 here, a rotating handle 1a extending upward for controlling the rotation of the compass is formed. A locking handle 4b adapted to the rotating handle 1a is formed on the lock head 4. When the lock head 4 is in the locked state, the locking handle 4b can be turned up and attached to the side of the rotating handle 1a to jointly form a complete handle 8 with the rotating handle 1a. By pulling down the locking handle 4b, the lock head 4 can be unlocked from the positioning foot 2 and the rotating foot 3. A first slot 1b for the locking handle 4b to flip and move is also opened on the compass head 1. At the same time, in order to make the formed handle 8 form a cylinder for convenient rotation control, the cross-sections of the locking handle 4b and the rotating handle 1a are both made into semi-circular shapes that are mutually adapted.

[0031] In this embodiment, in order to quickly drive the locking handle 4b to turn down, refer to Figure 1 As shown, in this embodiment, inclined surfaces 4b1 or arc surfaces are formed at the ends of the locking handle 4b and the rotating handle 1a toward the joint, so that a concave portion 8a is formed at the top of the handle 8, which is easy to control the locking handle 4b to turn down.

[0032] Refer to Figure 3 As shown, in this embodiment, in order to optimize the overall structure of the compass head 1 so that the positioning foot 2, the rotating foot 3 and the lock head 4 can be better installed on the compass head 1, the compass head 1 here includes a first compass head 11 and a second compass head 12 that are mutually adapted. The lock head 4 is built in the space formed by the enclosure of the first compass head 11 and the second compass head 12. A pin shaft 13 for the lock head 4 to flip and hinge is provided between the first compass head 11 and the second compass head 12. At least two fasteners 14 penetrating horizontally are also provided between the first compass head 11 and the second compass head 12. The positioning foot 2 and the rotating foot 3 are hinged on their respective corresponding second fasteners 14.

[0033] At the same time, in order to better set the fixing post 7 inside the compass head 1, refer to Figure 5 and Figure 6 As shown, a fixed sleeve 13a extending downward is provided on the pin shaft 13. The fixing post 7 passes through the pressing block 5 from bottom to top and is connected to the fixed sleeve 13a. A second slot 4c for avoiding interference with the fixed sleeve 13a when the lock head 4 flips is also opened on the lock head 4.

[0034] It should be further noted here that in this embodiment, a lock head 4 capable of flipping relative to the compass head 1 is provided on the compass head 1, and an eccentric cam 4a is formed on the lock head 4. The cam wall 4a1 of the eccentric cam 4a can gradually squeeze the tops of the positioning foot 2 and the rotating foot 3 during the flipping process of the lock head 4. When it is necessary to lock the positioning foot 2 and the rotating foot 3 with the foot distance adjusted, we only need to drive the lock handle 4b of the lock head 4 to flip upwards with one hand, and then the positioning foot and the rotating foot can be quickly fixed on the compass head, so that the distance between the positioning foot 2 and the rotating foot 3 can be instantly locked. Similarly, when it is necessary to unlock the positioning foot 2 and the rotating foot 3, we only need to drive the lock handle 4b of the lock head 4 to flip downwards with one hand to unlock the positioning foot 2 and the rotating foot 3. This avoids the drawback in the prior art that the foot distance needs to be locked or unlocked by continuously rotating the locking knob, making the adjustment operation of the compass foot distance more convenient and fast, and greatly improving the use efficiency of the compass.

[0035] It should be noted that in the description of this embodiment, the orientation or positional relationship indicated by the terms "front, back", "left, right", "inner, outer", "up, down", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A compass capable of quickly locking the foot spacing, comprising a compass head (1), a positioning foot (2) and a rotating foot (3), wherein the positioning foot (2) and the rotating foot (3) are hinged to the compass head (1) in a relative state, and the characteristics are as follows: The compass head (1) is provided with a locking head (4) capable of flipping relative to the compass head (1); an eccentric cam (4a) is formed on the locking head (4); a cam wall (4a1) of the eccentric cam (4a) can squeeze the tops of the positioning foot (2) and the rotating foot (3) during the flipping process of the locking head (4), thereby locking the positioning foot (2) and the rotating foot (3) with the pitch adjusted on the compass head (1).

2. The compass capable of quickly locking the foot distance according to claim 1, characterized in that: A pressing block (5) is further provided between the locking head (4) and the positioning foot (2) and the rotating foot (3). The pressing block (5) can be pressed against the top of the positioning foot (2) and the rotating foot (3) under the squeezing action of the eccentric cam (4a), so that the positioning foot (2) and the rotating foot (3) are locked on the compass head (1).

3. The compass capable of quickly locking the foot distance according to claim 2, wherein: The tops of the positioning foot (2) and the rotating foot (3) are both provided with teeth (6) that can mesh with each other when rotating relative to each other; the top of the extrusion block (5) is formed with an arc-shaped concave surface (5a) that fits the eccentric cam (4a); and the bottom of the extrusion block (5) is formed with an extrusion portion (5b) that fits the teeth (6).

4. The compass capable of quickly locking the foot distance according to claim 3, wherein: The teeth (6) are provided with grooves (6a) extending in the circumferential direction, and the extrusion portion (5b) is provided with a flange (5b1) that can fit into the groove (6a).

5. The compass capable of quickly locking the foot distance according to claim 2, wherein: A fixing column (7) for preventing the extrusion block (5) from deviating laterally is further provided in the compass head (1), and a through hole (5c) for the fixing column (7) to pass through up and down is provided on the extrusion block (5).

6. The compass capable of quickly locking the foot spacing according to any one of claims 1 to 5, characterized in that: The compass head (1) is provided with a handle (1a) extending upward for controlling the rotation of the compass, and the lock head (4) is provided with a lock handle (4b) adapted to the handle (1a). When the lock head (4) is in a locked state, the lock handle (4b) can be turned up to fit on the side of the handle (1a) and form a complete handle (8) together with the handle (1a). By turning the lock handle (4b) downward, the lock head (4) can release the locking of the positioning foot (2) and the rotating foot (3). The compass head (1) is also provided with a first slot (1b) for the lock handle (4b) to be turned over.

7. The compass capable of quickly locking the foot distance according to claim 6, wherein: The cross sections of the locking handle (4b) and the rotating handle (1a) are both semicircular and fit together.

8. The compass capable of quickly locking the foot distance according to claim 6, characterized in that: The ends of the locking handle (4b) and the rotating handle (1a) are both formed with an inclined surface (4b1) or an arc surface inclined toward the fitting position, so that a concave portion (8a) is formed on the top of the handle (8) for easily manipulating the locking handle (4b) to turn downward.

9. The compass capable of quickly locking the foot distance according to claim 5, wherein: The compass head (1) comprises a first compass head (11) and a second compass head (12) adapted to each other; the lock head (4) is built into a space enclosed by the first compass head (11) and the second compass head (12); a pin shaft (13) for the lock head (4) to be flipped and hinged is provided between the first compass head (11) and the second compass head (12); at least two transversely penetrating fasteners (14) are also provided between the first compass head (11) and the second compass head (12); the positioning foot (2) and the rotating foot (3) are hinged on the corresponding second fasteners (14) respectively.

10. The compass capable of quickly locking the foot spacing according to claim 9, characterized in that: A fixing sleeve (13a) extending downward is provided on the pin shaft (13). The fixing column (7) passes through the extrusion block (5) from bottom to top and is connected to the fixing sleeve (13a). A second slot (4c) is further formed in the lock head (4) to avoid interference with the fixing sleeve (13a) when the lock head (4) is turned over.

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