Compasses with protective sleeve

Abstract

A pair of compasses with a protective sleeve comprises a compasses head, a positioning foot, a rotating foot and the protective sleeve, the positioning foot and the rotating foot are connected to the compasses head, a spine part is arranged at the bottom of the positioning foot, and the protective sleeve can slide up and down in the axial direction of the positioning foot and has a storage state and a use state. During storage, the protective sleeve covers the spine part; and during use, the protective sleeve slides upwards to expose the spine part. A reset mechanism and a locking mechanism are arranged between the protective sleeve and the positioning pin, the reset mechanism ensures that the protective sleeve tends to be in a storage state, and the locking mechanism can lock the protective sleeve in a use state. Due to the fact that state switching of the protective sleeve is achieved in an up-down sliding mode, rapid switching can be achieved without occupying too much space, efficient switching between a storage state and a use state is achieved by arranging a reset mechanism and a locking mechanism and utilizing cooperation of the reset mechanism and the locking mechanism, and the use safety of the protective sleeve is improved. The whole switching process is simple and convenient, and can be quickly realized by a single hand.

Description

TECHNICAL FIELD

[0001] The utility model relates to compass technology field especially, relate to a compass with protective sheath. BACKGROUND

[0002] As a commonly used drawing tool, the compass has a safety hazard due to the sharpness of the needle foot, which can easily cause the needle tip of the compass to contact the user's hand, resulting in the user's hand being pierced and bleeding. Meanwhile, the exposed needle tip can also cause harm to other parts of the user, thereby posing a safety hazard to the user's personal safety. Therefore, some protective sheaths have been developed to protect the exposed needle foot.

[0003] For example, the Chinese utility model patent (with the application number 201721372039.1 and the authorization announcement number CN208682462) discloses a compass needle tip protective sheath, which includes a compass sharp foot, an outer thread is arranged on the outer column of the needle tip fixing body of the compass sharp foot, a threaded sleeve is connected to the outer thread, a bottom surface is arranged at the lower end of the threaded sleeve, and a circular hole with a diameter larger than that of the compass needle tip is arranged at the center position of the bottom surface. This compass needle tip protective sheath effectively protects the compass needle tip from being damaged and prevents the needle tip from causing harm to people. However, this scheme has obvious defects. The compass needle tip can be exposed only after rotating the threaded sleeve for multiple turns, which is inefficient. The storage and use states cannot be switched at high speed, and single-handed quick operation cannot be achieved.

[0004] For example, the Chinese utility model patent (with the application number 201220652562.0 and the authorization announcement number CN203004787) discloses a compass with a protective sheath, which includes a compass body, a fixed compass foot, a rotating shaft, a silica gel protective sheath, and a fixed iron tip. The rotating shaft is arranged on the upper part of the fixed iron tip of the fixed compass foot of the compass body, and the silica gel protective sheath is arranged on the rotating shaft. When the compass is not used, the silica gel protective sheath is covered and flipped through the rotating shaft and then fixed on the fixed iron tip. When the compass is used, the silica gel protective sheath is flipped to the upper part of the fixed iron tip in the opposite direction through the rotating shaft. However, this scheme also has problems. Since the silica gel protective sheath is relatively long, the movement track of the up-down flipping will occupy a large area, which also affects the coordination and aesthetics of the compass as a whole.

[0005] Therefore, how to provide a compass with a novel structure, which can be efficiently switched between the storage state and the use state by only using one hand, and the protective sheath will not occupy too much space during the switching process, is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0006] The utility model wants to solve the technical problem in the prior art, provide a novel structure, only through single hand can realize efficient switching between storage state and use state, and still can make the protective sleeve in the switching process does not occupy too much space's compass with protective sleeve.

[0007] The utility model adopts the technical scheme that the compass with protective sleeve solves the above technical problem, including compass head, positioning foot and rotating foot, positioning foot and rotating foot are opposite rotation connection on the compass head, the bottom of positioning foot forms the thorn part, the outer periphery of positioning foot is equipped with the protective sleeve that can slide up and down along its axial direction, the protective sleeve can form storage state and use state respectively in the sliding process,

[0008] When the protective sleeve is in the storage state, the protective sleeve covers the thorn part, and the lower end surface is flush with the tip of the thorn part or extends below the tip.

[0009] When the protective sleeve is in the use state, the protective sleeve is slid to above the thorn part, so that the thorn part is exposed.

[0010] The protective sleeve and the positioning foot are further provided with a reset mechanism that can always tend to the storage state of the protective sleeve and a locking mechanism that can lock the protective sleeve on the positioning foot after sliding to the use state.

[0011] In order to make the protective sleeve more stable in the up and down sliding process, and not to appear the shaking or deviation phenomenon, preferably, the side part of the positioning foot is provided with an axial direction extending guide groove, the inner wall of the protective sleeve is provided with a guide block or guide strip corresponding to the guide groove, and the guide groove and the guide strip or guide block realize sliding fit to constrain the sliding path of the protective sleeve.

[0012] In order to make the guide block or guide strip here smoothly and accurately enter the guide groove when installing, preferably, the positioning foot is further formed with a first inclined surface extending from the bottom to the direction of the guide groove, and the guide block or guide strip is formed with a second inclined surface corresponding to the first inclined surface, so that the guide strip or guide block can enter the guide groove from bottom to top through the extrusion fit of the first inclined surface and the second inclined surface.

[0013] In order to make the protective sleeve easy to be taken off when disassembling, cleaning or replacing, preferably, the upper end of the guide groove is further formed with a third inclined surface matched with the second inclined surface, so that the guide strip or guide block can be separated from the guide groove from bottom to top through the extrusion fit of the third inclined surface and the second inclined surface.

[0014] In order to make the reset mechanism stable and reliable in simple structure, so as to effectively ensure that the protective sleeve can be returned to the storage state in time when not in use, preferably, the reset mechanism comprises a compression spring, the upper end and the lower end of the compression spring are connected to the positioning foot and the protective sleeve respectively, so that the protective sleeve always has a tendency to return to the storage state.

[0015] In order to better drive the compression spring, preferably, the positioning foot is formed with a containing groove for vertically placing the compression spring, the top wall and the bottom wall of the containing groove are respectively provided with positioning columns for preventing the compression spring from being transversely separated, and the inner wall of the protective sleeve is formed with a push piece which extends transversely and can abut against the lower end of the compression spring. When the protective sleeve is in the state of upward sliding, the push piece can drive the compression spring into the compression energy storage state. The design of the containing groove and the positioning column ensures the stable installation of the compression spring, and the push piece realizes the effective connection between the compression spring and the protective sleeve, so that the protective sleeve can smoothly compress the spring to store energy during the sliding process.

[0016] In order to optimize the overall structure of the locking mechanism and ensure that the protective sleeve does not accidentally slide down when in use, preferably, the locking mechanism comprises a lock catch arranged on the side of the positioning foot and a lock slot arranged on the protective sleeve and corresponding to the lock catch. When the protective sleeve slides to the use state, the lock catch and the lock slot are buckled with each other to lock the protective sleeve in the use state.

[0017] In order to better realize the quick buckling of the lock catch and the lock slot, preferably, the top of the protective sleeve is provided with a connecting plate extending upward, the lock slot transversely penetrates the connecting plate, the top of the connecting plate is formed with a fourth inclined surface inclined from top to bottom towards the direction of the lock catch, and the lock catch is formed with a fifth inclined surface matched with the fourth inclined surface to facilitate the automatic buckling of the lock catch and the lock slot. Through the design of the fourth inclined surface and the fifth inclined surface, the lock catch and the lock slot can be more easily and automatically buckled when the protective sleeve is slid upward to the use state, improving the convenience of operation.

[0018] In order to make the positioning foot and the rotating foot of the compass automatically return the protective sleeve to the storage state when they are closed, preferably, the connecting plate of the protective sleeve is located on the opposite side of the rotating foot, the side of the rotating foot towards the positioning foot is further formed with a transversely extending push rod, the positioning foot is formed with a perforation for transversely penetrating the push rod, and the end of the push rod can push the connecting plate to make the lock slot of the connecting plate disengage from the lock catch when the positioning foot and the rotating foot are relatively rotated to the closed state. Through this design, when the positioning foot and the rotating foot of the compass are closed, the push rod can automatically push the connecting plate to unlock the protective sleeve, so that it can automatically return to the storage state when the compass is not in use, realizing one-handed operation and further improving the convenience and safety of use.

[0019] In order to facilitate the user to push the protective sleeve up and down with fingers, and ensure that the sharp part can be more smoothly up and down, preferably, the bottom of the protective sleeve is formed with a transition round corner which is easy to push the protective sleeve up and down, and the bottom of the protective sleeve is also formed with a notch which is easy to up and down the sharp part.

[0020] Compared with the prior art, the utility model has the advantages that: the protective sleeve is sleeved on the outer periphery of the positioning foot and can slide up and down along the axial direction, and the protective sleeve can form the storage state and the use state during the sliding process, the sharp part on the bottom of the positioning foot can be completely covered in the storage state, the user is effectively prevented from being pricked by the sharp part when not using the compass, the safety of the compass is greatly improved, the sharp part is quickly exposed by pushing the protective sleeve up and down, and the compass is put into use, the state switching of the protective sleeve is realized by sliding up and down, so that the state switching can be realized quickly without occupying too much space, the reset mechanism and the locking mechanism are arranged, the reset mechanism and the locking mechanism are cooperated, and efficient switching between the storage state and the use state is realized, the whole switching process is simple and convenient, and the switching can be realized quickly by using one hand. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the storage state);

[0022] Figure 2 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the use state);

[0023] Figure 3 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the storage state);

[0024] Figure 4 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the use state);

[0025] Figure 5 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the use state);

[0026] Figure 6 It is a schematic view of the three-dimensional structure of the embodiment (the protective sleeve is in the use state); DETAILED DESCRIPTION

[0027] The utility model will be further described in detail in combination with the embodiment of the drawings.

[0028] Figures 1-6 The schematic view of the embodiment is shown, and the compass with the protective sleeve in the embodiment mainly comprises a compass head 1, a positioning foot 2, a rotating foot 3, a protective sleeve 4, a reset mechanism 5 and a locking mechanism 6.

[0029] REFERENCE Figures 1 to 3As shown, the compass in the embodiment is assembled first by connecting the positioning foot 2 and the rotating foot 3 to the compass head 1 in a relative rotating manner, which ensures that the positioning foot 2 and the rotating foot 3 can rotate flexibly around the connecting point, providing a basis for subsequent drawing of circles with different radii.

[0030] The mounting and guiding structure of the protective sleeve 4 and the positioning foot 2 will be described with reference to Figs. 3 and Figure 6 As shown, the protective sleeve 4 is sleeved on the outer periphery of the positioning foot 2, the positioning foot 2 is provided with an axially extending guiding groove 2b on the side portion, and the inner wall of the protective sleeve 4 is provided with guiding blocks 4a or a guiding strip correspondingly, the guiding blocks 4a shown in the figure are provided in multiple numbers and are arranged in the axial direction of the positioning foot 2, and a single guiding strip can be used to replace the multiple guiding blocks 4a. During installation, the guiding blocks 4a or the guiding strip are aligned with the guiding groove 2b, and since the first inclined surface 2c extending from the bottom of the positioning foot 2 to the guiding groove 2b is adapted to the second inclined surface 4a1 on the guiding blocks 4a or the guiding strip, the guiding blocks 4a or the guiding strip can enter the guiding groove 2b smoothly from bottom to top during the process of pressing the protective sleeve 4 upward, so that the installation is completed, and the subsequent protective sleeve 4 can only slide up and down along the direction of the guiding groove 2b, ensuring the stability of the sliding path. In addition, in the embodiment, the upper end of the guiding groove 2b is further formed with a third inclined surface 2d adapted to the second inclined surface 4a1, and the third inclined surface 2d and the second inclined surface 4a1 can be extruded and adapted to make the guiding strip or the guiding blocks 4a separate from the guiding groove 2b from bottom to top.

[0031] The mounting and working principle of the reset mechanism 4 will be described with reference to Figures 3 to 5 As shown, a receiving groove 2e is pre-processed on the positioning foot 2 for vertically placing the compression spring 5a, and the top wall and the bottom wall of the receiving groove 2e are respectively provided with positioning columns 2e1, which prevent the compression spring 5a from being horizontally separated during the working process. After the compression spring 5a is placed in the receiving groove 2e, the upper end of the compression spring 5a is pressed against the top wall of the receiving groove 2e and is fixed by the positioning columns 2e1, and a transversely extending push piece 4b is arranged on the inner wall of the protective sleeve 4, which can press against the lower end of the compression spring 5a. When the protective sleeve 4 is pushed upward, the push piece 4b drives the compression spring 5a to move upward, so that the compression spring 5a enters a compressed energy storage state; after the external force disappears, the compression spring 5a releases the elastic potential energy and pushes the protective sleeve 4 to slide downward, so that the protective sleeve 4 always has a tendency to reset to the storage state.

[0032] The mounting and working principle of the locking mechanism 5 will be described with reference to Figures 3 to 5As shown: the locking buckle 6a is arranged on the side of the positioning foot 2, the connecting plate 4c extending upwards is arranged on the top of the protective sleeve 4, the locking slot 6b is arranged transversely through the connecting plate 4c, the position of the locking buckle 6a corresponds to the position of the locking slot 6b, the fourth inclined surface 4c1 inclined from top to bottom towards the locking buckle 6a is arranged on the top of the connecting plate 4c, and the fifth inclined surface 6a1 matching the fourth inclined surface 4c1 is arranged on the locking buckle 6a. When the protective sleeve 4 is slid upwards to the use state, under the interaction of the fourth inclined surface 4c1 and the fifth inclined surface 6a1, the locking buckle 6a can be smoothly buckled with the locking slot 6b, so as to lock the protective sleeve 4 in the use state, and ensure that the protective sleeve 4 will not accidentally slide down during the use of the compass.

[0033] The linkage structure and working mode of the rotating foot 3 and the protective sleeve 4 can refer to Figs. 4 and Figure 5 As shown: the push rod 3a extending transversely is arranged on the side of the rotating foot 3 facing the positioning foot 2, and the through hole 2f for the push rod 3a to pass through transversely is arranged on the positioning foot 2. When the positioning foot 2 and the rotating foot 3 are relatively rotated to the closed state, the end of the push rod 3a pushes the connecting plate 4c. Since the locking slot 6b on the connecting plate 4c is buckled with the locking buckle 6a, the pushing force of the push rod 3a moves the connecting plate 4c, so as to make the locking slot 6b disengage from the locking buckle 6a, thereby realizing the unlocking of the protective sleeve 4. Under the action of the reset mechanism 4, the protective sleeve 4 can be smoothly returned to the storage state.

[0034] In this embodiment, in order to increase the effect and use experience of the design of the bottom of the protective sleeve 4, reference is made to Figure 6 As shown, the transition round corner 4d and the notch 4e are specially designed on the bottom of the protective sleeve 4. In actual use, the transition round corner 4d facilitates the user to push the protective sleeve 4 upwards with fingers, thereby increasing the convenience and comfort of operation. The existence of the notch 4e facilitates the up-and-down threading of the sharp part 2a, avoids the interference between the sharp part 2a and the bottom of the protective sleeve 4 during the sliding of the protective sleeve 4, and ensures the smoothness of the compass when switching between the storage state and the use state. Of course, the notch 4e here can also be replaced by a through hole.

[0035] It is additionally pointed out here that the state switching process of the protective sleeve, and the specific switching principle is as follows:

[0036] When switching from the storage state to the use state, reference is made to Figure 1 and Figure 2 , Figure 4 and Figure 5As shown, the user pushes the transition round corner 4d at the bottom of the protective sleeve 4 with fingers, so that the protective sleeve 4 slides upward against the elastic force of the compression spring 5a, and in the process of sliding, the tab 4b on the inner wall of the protective sleeve 4 drives the compression spring 5a to compress and store energy. When the protective sleeve 4 rises to a certain position, the lock catch 6a meets the lock slot 6b. Since the fourth inclined surface 4c1 at the top of the connecting plate 4c and the fifth inclined surface 6a1 on the lock catch 6a are adapted to each other, the lock catch 6a is smoothly clamped into the lock slot 6b, locking the protective sleeve 4 in the use state. At this time, the sharp part 2a at the bottom of the positioning foot 2 is exposed and can be normally used for drawing.

[0037] As shown in Figure 1 and Figure 2 、 Figure 4 and Figure 5 , after the drawing is completed, the positioning foot 2 and the rotating foot 3 are relatively rotated to the closed state, the push rod 3a on the side of the rotating foot 3 passes through the perforation 2f on the positioning foot 2 and pushes the connecting plate 4c of the protective sleeve 4. This pushing force makes the lock slot 6b disengage from the lock catch 6a, and the locking of the protective sleeve 4 is released. Subsequently, the compression spring 5a in the compressed state releases the elastic potential energy and pushes the protective sleeve 4 to slide downward, returning to the storage state and covering the sharp part 2a to prevent accidental injury. Here, the connecting plate 4c can also be directly pushed outward by fingers to make the lock slot 6b disengage from the lock catch 6a and release the locking of the protective sleeve 4.

[0038] It should be noted that in the description of the embodiment, the terms "front, back, left, right, inner, outer, upper, lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A compass with a protective cover, comprising a compass head (1), a positioning leg (2) and a rotating leg (3), the positioning leg (2) and the rotating leg (3) being connected to the compass head (1) in a relative rotating manner, a pointed part (2a) being formed at the bottom of the positioning leg (2), characterized in that: The outer periphery of the positioning foot (2) is sleeved with a protective sleeve (4) which can slide up and down along the axial direction of the positioning foot (2), and the protective sleeve (4) can form a storage state and a use state respectively during the sliding process. When the protective sleeve (4) is in the storage state, the protective sleeve (4) covers the sharp portion (2a), and the lower end surface of the protective sleeve (4) is flush with or extends below the tip of the sharp portion (2a). When the protective sleeve (4) is in the use state, the protective sleeve (4) slides above the sharp portion (2a), so that the sharp portion (2a) is exposed. The protective sleeve (4) and the positioning foot (2) are further provided with a reset mechanism (5) which can always tend to the storage state of the protective sleeve (4), and a locking mechanism (6) which can lock the protective sleeve (4) on the positioning foot (2) after the protective sleeve (4) slides to the use state.

2. The compass with protective cover according to claim 1, characterized in that: The side portion of the positioning foot (2) is provided with an axial extending guide groove (2b), and the inner wall of the protective sleeve (4) is provided with a guide block (4a) or a guide strip corresponding to the guide groove (2b), and the guide groove (2b) and the guide strip or the guide block (4a) realize sliding fit to constrain the sliding path of the protective sleeve (4).

3. The compass with protective cover according to claim 2, characterized in that: The positioning foot (2) is further formed with a first inclined surface (2c) extending from the bottom to the direction of the guide groove (2b), and the guide block (4a) or the guide strip is formed with a second inclined surface (4a1) corresponding to the first inclined surface (2c), and the first inclined surface (2c) and the second inclined surface (4a1) are adapted by extrusion to make the guide strip or the guide block (4a) enter the guide groove (2b) from bottom to top.

4. The compass with protective cover according to claim 3, characterized in that: The upper end of the guide groove (2b) is further formed with a third inclined surface (2d) adapted to the second inclined surface (4a1), and the third inclined surface (2d) and the second inclined surface (4a1) are adapted by extrusion to make the guide strip or the guide block (4a) separate from the guide groove (2b) from bottom to top.

5. The compass with protective cover according to claim 1, wherein: The reset mechanism (5) comprises a compression spring (5a), and the upper end and the lower end of the compression spring (5a) are connected to the positioning foot (2) and the protective sleeve (4) respectively, so that the protective sleeve (4) always has a tendency to reset to the storage state.

6. The compass with protective cover according to claim 5, wherein: The positioning foot (2) is formed with a containing groove (2e) for vertically placing the compression spring (5a), and the top wall and the bottom wall of the containing groove (2e) are respectively provided with positioning columns (2e1) for preventing the compression spring (5a) from transversely separating, and the inner wall of the protective sleeve (4) is formed with a push piece (4b) which extends transversely and can abut against the lower end of the compression spring (5a), and when the protective sleeve (4) is in the state of upward sliding, the push piece (4b) can drive the compression spring (5a) to enter the compression energy storage state.

7. The compass with protective cover according to claim 1, wherein: The locking mechanism (6) comprises a lock catch (6a) provided on the side portion of the positioning foot (2) and a lock groove (6b) provided on the protective sleeve (4) and corresponding to the lock catch (6a), and when the protective sleeve (4) slides to the use state, the lock catch (6a) and the lock groove (6b) are buckled with each other to lock the protective sleeve (4) in the use state.

8. The compass with protective cover according to claim 7, characterized in that: The top of the protective sleeve (4) is provided with a connecting plate (4c) extending upwardly, the lock slot (6b) extends transversely through the connecting plate (4c), the top of the connecting plate (4c) is formed with a fourth inclined surface (4c1) inclined downwardly from top to bottom toward the lock catch (6a), the lock catch (6a) is formed with a fifth inclined surface (6a1) matching the fourth inclined surface (4c1) to facilitate automatic engagement of the lock catch (6a) with the lock slot (6b).

9. The compass with protective cover according to claim 8, characterized in that: The connecting plate (4c) of the protective sleeve (4) is located at the opposite side of the rotating leg (3), the side of the rotating leg (3) facing the positioning leg (2) is further formed with a push rod (3a) extending transversely, the positioning leg (2) is formed with a through hole (2f) for the push rod (3a) to extend transversely, when the positioning leg (2) and the rotating leg (3) are relatively rotated to the closed state, the end of the push rod (3a) can push the connecting plate (4c) to make the lock slot (6b) of the connecting plate (4c) disengage from the lock catch (6a).

10. The compass with protective cover according to any one of claims 1 to 9, characterized in that: The bottom of the protective sleeve (4) is formed with a transition round corner (4d) facilitating the pushing and sliding of the protective sleeve (4), the bottom of the protective sleeve (4) is further formed with a notch (4e) facilitating the up and down passing of the sharp portion (2a).

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