An adjustable laser positioning device

Abstract

The present invention relates to the technical field of laser applications, and specifically relates to an adjustable laser positioning device, including: a bottom plate, a base is provided at the upper end of the bottom plate, a dial is provided at the upper end of the base, a moving groove is provided inside the base, a sliding groove is provided on one side of the moving groove, and a jack is provided on the other side of the moving groove; an adjusting assembly, the adjusting assembly includes a base, a locking bolt, an adjusting rotating plate, a laser pen sleeve, and a positioning bolt; a movable positioning assembly, the movable positioning assembly includes a movable block, a movable groove, a pressing plate, a spring, a movable pulling plate, a movable pulling block, a positioning insertion plate, and a reset groove; the beneficial effect is that: the multiple groups of adjusting assemblies provided in the adjustable laser positioning device proposed by the present invention cooperate with the dial to simultaneously position multiple devices, avoiding positioning each device in the corridor one by one.

Description

Technical Field

[0001] The present invention relates to the technical field of laser applications, and particularly to an adjustable laser positioning device. Background Art

[0002] A laser locator, characterized in that: it includes a lamp cover and a lamp body, and the lamp cover and the lamp body are fitted together to form an integral structure; at least one laser adjustment mechanism is provided inside the lamp body, and at least one laser window for passing through the laser light line emitted by the laser adjustment mechanism is provided on the lamp cover.

[0003] During the process of engineering construction, in buildings with standard floors such as office buildings, apartments, and residences, equipment such as sprinklers, lamps, and radios installed on the corridor ceilings need to be positioned and arranged to avoid conflicts in the installation positions of the equipment. In buildings with standard floors, the positions and quantities of the equipment on the corridor ceilings of each floor are the same. During on-site construction, each piece of equipment on each floor needs to be positioned using a laser locator, and then multiple pieces of equipment on the corridor of each floor are positioned one by one according to the positions on the drawings, making the positioning work rather cumbersome, increasing the construction difficulty, and thus further improvement and optimization are required. Summary of the Invention

[0004] The purpose of the present invention is to provide an adjustable laser positioning device to solve the problem that the equipment on the corridor of each floor needs to be positioned during engineering construction, making the positioning work rather cumbersome as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An adjustable laser positioning device, comprising:

[0006] A bottom plate, with a base provided at the upper end of the bottom plate, a scale disk provided at the upper end of the base, a moving groove provided inside the base, a sliding groove provided on one side of the moving groove, and a jack provided on the other side of the moving groove;

[0007] An adjustment component, the adjustment component includes a base, a locking bolt, an adjustment rotating plate, a laser pen sleeve, and a positioning bolt;

[0008] A movable positioning component, the movable positioning component includes a movable block, a movable groove, a resisting plate, a spring, a movable pulling plate, a movable pulling block, a positioning insertion plate, and a reset groove; and

[0009] A reset locking component, the reset locking component includes a reset moving groove, a rotating rod, a moving block, a reset convex block, a screwing head, a screwing hole, a storage cavity, a limiting plate, a first locking tooth, a spring piece, a locking ring, and a second locking tooth.

[0010] Preferably, multiple groups of adjustment components are equidistantly arranged at the upper end of the bottom plate.

[0011] Preferably, the base is fixedly arranged at the upper end of the bottom plate. The base is located on the other side of the pedestal. The base is arranged in a U-shaped structure, and the upper end of the base is semi-circular.

[0012] Preferably, a locking bolt is arranged inside the base, and an adjusting rotating plate is arranged inside the base. A through hole is arranged inside the adjusting rotating plate corresponding to the locking bolt. The locking bolt passes through the through hole of the adjusting rotating plate and extends to one side of the base. The upper end of the adjusting rotating plate is fixedly connected to a laser pen sleeve. The laser pen sleeve is arranged in a circular tubular shape, and a positioning bolt is threadedly connected to the middle of the other side of the laser pen sleeve.

[0013] Preferably, the moving groove is arranged in a T-shaped groove structure. The upper ends of the moving grooves all penetrate through the pedestal. The sliding groove is arranged as a horizontal moving groove, and the sliding groove penetrates through the side wall of the pedestal. Multiple groups of jacks are arranged corresponding to the adjusting assembly. The jacks are all aligned with the two side end faces of the corresponding base, and the jacks all penetrate through the side wall of the pedestal.

[0014] Preferably, the movable block is movably arranged inside the moving groove. An activity groove is arranged inside the movable block. A pressing plate is movably arranged inside the activity groove. The sizes of the pressing plates are all adapted to the activity groove. Springs are fixedly connected to both ends of one side of the pressing plate, and the other sides of the springs are fixedly connected to the side wall of the activity groove. A movable pulling plate is fixedly connected to the middle of one side of the pressing plate. One sides of the movable pulling plates all penetrate through the movable block and the sliding groove and extend to the outside. Movable pulling blocks are fixedly connected to one sides of the movable pulling plates. An annular inner groove is arranged in the middle of the outside of the movable pulling block.

[0015] Preferably, two groups of positioning plug plates are symmetrically arranged on the other side of the pressing plate. The other sides of the positioning plug plates all penetrate through the activity groove and the jack and extend to the outside. The other sides of the positioning plug plates are all attached to the two side walls of the corresponding base. Arc surfaces are arranged at the ends of the other sides of the positioning plug plates. Reset grooves are arranged at the upper and lower ends of the positioning plug plates, and the outside of the reset grooves all penetrate through the positioning plug plates.

[0016] Preferably, two groups of complex displacement grooves are symmetrically arranged up and down inside the movable block. Rotating rods are movably arranged inside the complex displacement grooves. The rotating rods are arranged in a horizontal rod-shaped structure. One end of the rotating rod penetrates through the complex displacement groove and extends to the outside of the movable block. Two groups of threaded grooves are arranged on the left and right of the middle of the rotating rod. The spiral directions of the two groups of threaded grooves are opposite. Moving blocks are screwed on the outside of the threaded grooves. The sizes of the moving blocks are all adapted to the complex displacement grooves. Reset convex blocks are fixedly connected to the inner ends of the moving blocks. The reset convex blocks are arranged in an annular structure, and the inner ends of the reset convex blocks are all located inside the reset grooves.

[0017] Preferably, one end of each of the rotating rods is provided with a screwing head. The screwing head is arranged in a columnar structure. One end of each screwing head is provided with a screwing hole. A receiving cavity is arranged inside each screwing head. The receiving cavity is arranged as a T-shaped columnar groove. A limiting plate is movably arranged inside each receiving cavity. The size of the limiting plate is adapted to that of the receiving cavity. One end of each rotating rod extends into the receiving cavity, and one end of each rotating rod is fixedly connected to the limiting plate. A first locking tooth is movably arranged at the other end of each screwing head. The first locking tooth is movably sleeved outside the rotating rod. A plurality of groups of spring pieces are arranged at equal intervals in a ring shape on the outside of the screwing head, and the inner sides of the spring pieces are fixedly connected to the screwing head.

[0018] Preferably, there are two groups of locking rings corresponding to the screwing heads. The other ends of the locking rings are fixedly connected to movable blocks. The locking rings are arranged in an annular structure. The locking rings are coaxial with the screwing heads. A plurality of groups of second locking teeth are arranged at equal intervals in a ring shape on the inner sides of the locking rings. The second locking teeth are all engaged with the spring pieces.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In the adjustable laser positioning device proposed by the present invention, the multiple groups of adjusting components cooperate with the scale disk, which can simultaneously position multiple devices, avoiding positioning each device in the corridor one by one. Moreover, the positions of the devices on each standard floor are the same. After the first adjustment of the adjusting components is completed, the devices on other floors of the same building can be positioned, reducing the time required for positioning the devices and improving work efficiency. And through the arranged movable positioning components, the position of the scale disk can be adjusted. Through the arranged positioning insertion plate, it is convenient to fix the movable block and facilitate fixing the scale disk, ensuring the accuracy of the rotation angle during the adjustment work of the adjusting components. And through the arranged reset convex block cooperating with the reset groove, it is convenient to reset the positioning insertion plate, avoiding the positioning insertion plate being bent after multiple uses, resulting in poor positioning effect on the movable block. And through the arranged screwing head cooperating with the rotating rod, it is convenient to adjust the position of the reset convex block, facilitating maintaining the reset effect on the positioning insertion plate after the reset convex block is worn after long-term use. And through the arranged locking ring cooperating with the spring piece, it is convenient to lock the screwing head, avoiding the screwing head moving during positioning use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is a schematic structural diagram of the base of the present invention;

[0023] Figure 3 is an exploded view of the structure of the adjusting component of the present invention;

[0024] Figure 4 is a rear sectional view of the base of the present invention;

[0025] Figure 5 Schematic structural diagram of the movable positioning component of the present invention;

[0026] Figure 6 Top view sectional view of the movable positioning component of the present invention;

[0027] Figure 7 Side sectional view of the movable block of the present invention;

[0028] Figure 8 Partial sectional view of the movable block of the present invention;

[0029] Figure 9 is Figure 8 Enlarged schematic diagram of the structure at A in

[0030] In the figure: bottom plate 1, base 2, dial 3, adjustment component 4, base 41, locking bolt 42, adjustment rotating plate 43, laser pen sleeve 44, positioning bolt 45, moving groove 5, sliding groove 6, jack 7, movable positioning component 8, movable block 81, movable groove 82, abutting plate 83, spring 84, movable pulling plate 85, movable pulling block 86, positioning insertion plate 87, reset groove 88, reset locking component 9, reset moving groove 901, rotating rod 902, moving block 903, reset convex block 904, screwing head 905, screwing hole 906, storage cavity 907, limiting plate 908, first locking tooth 909, spring piece 910, locking ring 911, second locking tooth 912. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] Please refer to Figures 1 to 9, the present invention provides a technical solution: an adjustable laser positioning device, comprising: a bottom plate 1, a base 2 is provided at the upper end of the bottom plate 1, a dial 3 is provided at the upper end of the base 2, a moving groove 5 is provided inside the base 2, a sliding groove 6 is provided on one side of the moving groove 5, and a jack 7 is provided on the other side of the moving groove 5; an adjusting assembly 4, the adjusting assembly 4 includes a base 41, a locking bolt 42, an adjusting rotating plate 43, a laser pen sleeve 44, and a positioning bolt 45; a movable positioning assembly 8, the movable positioning assembly 8 includes a movable block 81, a movable groove 82, a pressing plate 83, a spring 84, a movable pulling plate 85, a movable pulling block 86, a positioning plug 87, and a reset groove 88; and a reset locking assembly 9, the reset locking assembly 9 includes a reset displacement groove 901, a rotating rod 902, a moving block 903, a reset convex block 904, a screwing head 905, a screwing hole 906, a storage cavity 907, a limiting plate 908, a first locking tooth 909, a spring piece 910, a locking ring 911, and a second locking tooth 912.

[0034] Embodiment Two

[0035] On the basis of Embodiment Two, a plurality of groups of adjusting assemblies 4 are equidistantly arranged at the upper end of the bottom plate 1. The base 41 is fixedly arranged at the upper end of the bottom plate 1. The base 41 is located on the other side of the base 2. The base 41 is arranged in a U-shaped structure. The upper end of the base 41 is semi-circular. A locking bolt 42 is arranged inside the base 41. An adjusting rotating plate 43 is arranged inside the base 41. A through hole is correspondingly arranged in the adjusting rotating plate 43 for the locking bolt 42. The locking bolt 42 passes through the through hole of the adjusting rotating plate 43 and extends to one side of the base 41. The upper end of the adjusting rotating plate 43 is fixedly connected to the laser pen sleeve 44. The laser pen sleeve 44 is arranged in a circular cylindrical shape. A positioning bolt 45 is threadedly connected to the middle of the other side of the laser pen sleeve 44. The moving groove 5 is arranged in a T-shaped groove structure. The upper end of the moving groove 5 penetrates through the base 2. The sliding groove 6 is arranged as a horizontal moving groove. The sliding groove 6 penetrates through the side wall of the base 2. A plurality of groups of jacks 7 are correspondingly arranged for the adjusting assemblies 4. The jacks 7 are aligned with the two side end faces of the corresponding base 41. The jacks 7 all penetrate through the side wall of the base 2. By arranging a plurality of groups of adjusting assemblies 4, it is convenient to fix a plurality of groups of laser pens and facilitate the positioning of multiple devices.

[0036] Embodiment Three

[0037] On the basis of Embodiment 2, the movable block 81 is movably arranged inside the moving groove 5. An activity groove 82 is arranged inside the movable block 81. A resisting plate 83 is movably arranged inside the activity groove 82. The sizes of the resisting plate 83 are all adapted to the activity groove 82. Springs 84 are fixedly connected to both ends of one side of the resisting plate 83. The other sides of the springs 84 are fixedly connected to the side walls of the activity groove 82. An activity pull plate 85 is fixedly connected to the middle of one side of the resisting plate 83. One sides of the activity pull plates 85 all penetrate through the movable block 81 and the sliding groove 6 and extend to the outside. Activity pull blocks 86 are fixedly connected to one sides of the activity pull plates 85. An annular inner groove is arranged in the middle of the outside of the activity pull block 86. Two groups of positioning insertion plates 87 are symmetrically arranged on the other side of the resisting plate 83. The other sides of the positioning insertion plates 87 all penetrate through the activity groove 82 and the jacks 7 and extend to the outside. The other sides of the positioning insertion plates 87 are all in contact with the side walls on both sides of the corresponding base 41. Arc surfaces are arranged at the ends of the other sides of the positioning insertion plates 87. Reset grooves 88 are arranged at both the upper and lower ends of the positioning insertion plates 87. The outside of the reset grooves 88 all penetrates through the positioning insertion plates 87. By arranging the movable positioning assembly 8, the dial 3 can be conveniently moved to ensure the accuracy of the rotation angle during the adjustment work of the adjustment assembly 4.

[0038] Embodiment 4

[0039] On the basis of Embodiment 3, two sets of complex displacement grooves 901 are symmetrically arranged up and down inside the movable block 81. Inside the complex displacement grooves 901, rotating rods 902 are movably arranged. The rotating rods 902 are arranged in a transverse rod-shaped structure. One end of the rotating rod 902 penetrates through the complex displacement groove 901 and extends to the outside of the movable block 81. Two sets of threaded grooves are arranged on the left and right in the middle of the rotating rod 902. The spiral directions of the two sets of threaded grooves are opposite. Movable blocks 903 are screwed on the outside of the threaded grooves. The sizes of the movable blocks 903 are all adapted to the complex displacement grooves 901. The inner ends of the movable blocks 903 are fixedly connected with reset convex blocks 904. The reset convex blocks 904 are arranged in an annular structure. The inner ends of the reset convex blocks 904 are all located inside the reset groove 88. One end of each rotating rod 902 is provided with a screwing screw head 905. The screwing screw head 905 is arranged in a columnar structure. One end of each screwing screw head 905 is provided with a screwing hole 906. A receiving cavity 907 is arranged inside each screwing screw head 905. The receiving cavity 907 is arranged as a T-shaped columnar groove. Inside the receiving cavity 907, limiting plates 908 are movably arranged. The sizes of the limiting plates 908 are all adapted to the receiving cavity 907. One end of each rotating rod 902 extends into the receiving cavity 907. One end of each rotating rod 902 is fixedly connected with the limiting plate 908. The other end of each screwing screw head 905 is movably provided with a first locking tooth 909. The first locking tooth 909 is movably sleeved on the outside of the rotating rod 902. A plurality of spring pieces 910 are arranged at equal intervals in a ring shape on the outside of the screwing screw head 905. The inner sides of the spring pieces 910 are fixedly connected with the screwing screw head 905. Two locking rings 911 are correspondingly arranged for each screwing screw head 905. The other ends of the locking rings 911 are fixedly connected with the movable block 81. The locking rings 911 are arranged in an annular structure. The locking rings 911 are coaxial with the screwing screw heads 905. A plurality of second locking teeth 912 are arranged at equal intervals in a ring shape on the inner sides of the locking rings 911. The second locking teeth 912 are all engaged with the spring pieces 910. By providing the reset locking assembly 9, it is convenient to reset the positioning plug 87, and avoid the positioning plug 87 from being bent after multiple uses, resulting in poor positioning effect on the movable block 81.

[0040] In use, first pull the movable pulling block 86 to one side. The movable pulling block 86 drives the abutting plate 83 to move to one side through the movable pulling plate 85. The abutting plate 83 drives the positioning insertion plate 87 to move along the insertion hole 7 to one side. When the positioning insertion plate 87 returns to the inside of the movable block 81, it no longer restricts the dial 3. Then move the dial 3 left and right so that the center line of the dial 3 aligns with the center of the adjustment component 4 to be adjusted. The positioning insertion plate 87 aligns with the corresponding insertion hole 7. Release the movable pulling block 86. The spring 84 pushes the abutting plate 83 to move through its own elastic force. The abutting plate 83 pushes the positioning insertion plate 87 to move outward, so that the positioning insertion plate 87 comes to both sides of the corresponding base 41 along the insertion hole 7 to fix the dial 3. At the same time, when the positioning insertion plate 87 expands and contracts, the reset convex block 904 resets the positioning insertion plate 87 through the friction with the inner wall of the reset groove 88 to prevent the positioning insertion plate 87 from deforming. Then turn the positioning bolt 45 in the corresponding adjustment component 4 so that the positioning bolt 45 leaves the inside of the laser pen sleeve 44. Insert the laser pen into the laser pen sleeve 44 upside down. Then turn the positioning bolt 45 to fix the laser pen in the laser pen sleeve 44. Then loosen the locking bolt 42 and the nut, turn on the laser pen, and adjust the angle of the laser pen sleeve 44 with reference to the dial 3 so that the laser pen locates the position of the device. After determining the position, tighten the locking bolt 42 and the nut again to complete the fixation of the laser pen sleeve 44 and achieve the positioning of the device position.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable laser positioning device, characterized in that, Comprising: A bottom plate (1), a base (2) is provided at the upper end of the bottom plate (1), a dial (3) is provided at the upper end of the base (2), a moving groove (5) is provided inside the base (2), a sliding groove (6) is provided on one side of the moving groove (5), and a jack (7) is provided on the other side of the moving groove (5); An adjusting assembly (4), the adjusting assembly (4) includes a base (41), a locking bolt (42), an adjusting rotating plate (43), a laser pen sleeve (44), a positioning bolt (45); a locking bolt (42) is provided inside the base (41), an adjusting rotating plate (43) is provided inside the base (41), a through hole is provided in the adjusting rotating plate (43) corresponding to the locking bolt (42), the locking bolt (42) passes through the through hole of the adjusting rotating plate (43) and extends to one side of the base (41), the upper end of the adjusting rotating plate (43) is fixedly connected to the laser pen sleeve (44), the laser pen sleeve (44) is provided as a circular tube, and a positioning bolt (45) is threadedly connected to the middle of the other side of the laser pen sleeve (44); A movable positioning assembly (8), the movable positioning assembly (8) includes a movable block (81), a movable groove (82), a resisting plate (83), a spring (84), a movable pulling plate (85), a movable pulling block (86), a positioning plug (87), a reset groove (88); the movable block (81) is movably arranged inside the moving groove (5), the upper end of the movable block (81) is fixedly connected to the dial (3), a movable groove (82) is provided inside the movable block (81), a resisting plate (83) is movably arranged inside the movable groove (82), the size of the resisting plate (83) is adapted to the movable groove (82), springs (84) are fixedly connected to both ends of one side of the resisting plate (83), the other side of the springs (84) is fixedly connected to the side wall of the movable groove (82), a movable pulling plate (85) is fixedly connected to the middle of one side of the resisting plate (83), one side of the movable pulling plate (85) passes through the movable block (81) and the sliding groove (6) and extends to the outside, movable pulling blocks (86) are fixedly connected to one side of the movable pulling plate (85), and an annular inner groove is provided in the middle of the outside of the movable pulling block (86); two groups of positioning plugs (87) are symmetrically arranged on the other side of the resisting plate (83), the other side of the positioning plugs (87) passes through the movable groove (82) and the jack (7) and extends to the outside, the other side of the positioning plugs (87) is in contact with the side walls of both sides of the corresponding base (41), arc surfaces are provided at the ends of the other side of the positioning plugs (87), reset grooves (88) are provided at both the upper and lower ends of the positioning plugs (87), and the outside of the reset grooves (88) passes through the positioning plugs (87); A reset locking assembly (9), the reset locking assembly (9) includes a reset displacement groove (901), a rotating rod (902), a moving block (903), a reset convex block (904), a screwing head (905), a screwing hole (906), a storage cavity (907), a limiting plate (908), a first locking tooth (909), a spring piece (910), a locking ring (911), a second locking tooth (912).

2. The adjustable laser positioning device according to claim 1, characterized in that: Multiple groups of adjusting assemblies (4) are equidistantly arranged at the upper end of the bottom plate (1).

3. The adjustable laser positioning device according to claim 2, characterized in that: The base (41) is fixedly arranged at the upper end of the bottom plate (1). The base (41) is located on the other side of the pedestal (2). The base (41) is arranged in a U-shaped structure, and the upper end of the base (41) is semi-circular.

4. The adjustable laser positioning device according to claim 1, characterized in that: The moving groove (5) is arranged in a T-shaped groove structure. The upper ends of the moving grooves (5) penetrate through the pedestal (2). The sliding groove (6) is arranged as a horizontal moving groove, and the sliding groove (6) penetrates through the side wall of the pedestal (2). A plurality of groups of jacks (7) are arranged corresponding to the adjusting assembly (4). The jacks (7) are aligned with the two side end faces of the corresponding base (41), and the jacks (7) all penetrate through the side wall of the pedestal (2).

5. The adjustable laser positioning device according to claim 1, characterized in that: Two groups of complex displacement grooves (901) are symmetrically arranged up and down inside the moving block (81). A rotating rod (902) is movably arranged inside each of the complex displacement grooves (901). The rotating rod (902) is arranged in a horizontal rod-shaped structure. One end of the rotating rod (902) penetrates through the complex displacement groove (901) and extends to the outside of the moving block (81). Two groups of threaded grooves are arranged on the left and right in the middle of the rotating rod (902). The spiral directions of the two groups of threaded grooves are opposite. Moving blocks (903) are screwed on the outside of the threaded grooves. The sizes of the moving blocks (903) are all adapted to the complex displacement grooves (901). The inner ends of the moving blocks (903) are fixedly connected with reset convex blocks (904). The reset convex blocks (904) are arranged in a ring structure. The inner ends of the reset convex blocks (904) are all located inside the reset groove (88).

6. The adjustable laser positioning device according to claim 5, characterized in that: One end of each of the rotating rods (902) is provided with a screwing screw head (905). The screwing screw head (905) is arranged in a columnar structure. One end of each of the screwing screw heads (905) is provided with a screwing hole (906). A receiving cavity (907) is arranged inside each of the screwing screw heads (905). The receiving cavity (907) is arranged as a T-shaped columnar groove. A limiting plate (908) is movably arranged inside each of the receiving cavities (907). The size of the limiting plate (908) is adapted to the receiving cavity (907). One end of each of the rotating rods (902) extends into the receiving cavity (907). One end of each of the rotating rods (902) is fixedly connected with the limiting plate (908). The other end of each of the screwing screw heads (905) is movably provided with a first locking tooth (909). The first locking tooth (909) is movably sleeved on the outside of the rotating rod (902). A plurality of groups of spring pieces (910) are arranged at equal intervals in a ring on the outside of the screwing screw head (905). The inner sides of the spring pieces (910) are fixedly connected with the screwing screw head (905).

7. The adjustable laser positioning device according to claim 6, characterized in that: Two groups of locking rings (911) are arranged corresponding to the screwing screw heads (905). The other ends of the locking rings (911) are fixedly connected with the moving block (81). The locking rings (911) are arranged in a ring structure. The locking rings (911) are coaxial with the screwing screw heads (905). A plurality of groups of second locking teeth (912) are arranged at equal intervals in a ring on the inner side of the locking rings (911). The second locking teeth (912) are all engaged with the spring pieces (910).

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