Quick barbell / dumbbell locking device

Abstract

The invention belongs to the technical field of locking connection, and particularly relates to a barbell / dumbbell fast locking device which comprises an inner cylinder with an axial through hole and an outer sleeve connected outside the inner cylinder in a sleeving mode, the outer side wall of the inner cylinder is provided with a first conical face, and the inner wall of the outer sleeve is provided with a second conical face matched with the first conical face. An inclined face is arranged on the outer side wall, on the large-diameter side of the first conical face, of the inner cylinder, an unlocking button for driving the inclined face to move axially is arranged on a transverse groove in the top of the outer sleeve, steel balls are sleeved with first through holes formed in the first conical face of the inner cylinder in the circumferential direction at intervals, and an annular cover plate is connected to the end face, on the groove side, of the outer sleeve. And a spring for driving the inner cylinder to move in the direction far away from the cover plate is arranged between the cover plate and the inner cylinder. The locking device has the advantages of simple structure, convenience in use, stable performance and firmness in locking, and is suitable for locking and positioning components on shafts or pipe fittings.

Description

Technical Field

[0001] The present invention belongs to the technical field of locking connections, and particularly relates to a barbell / dumbbell quick locking device. Background Art

[0002] Currently, there are many positioning and locking structures for shaft parts and pipe parts, such as threaded connectors, pins or steel ball push-pull locking parts, etc. Their disadvantages are that they are cumbersome to operate, laborious, time-consuming, and not suitable for the quick disassembly and assembly of different weights required for barbells / dumbbells. Summary of the Invention

[0003] The purpose of the present invention is to provide a barbell / dumbbell quick locking device that is convenient for disassembly and assembly, short in time consumption, capable of quickly locking and positioning, and quickly disassembling and assembling.

[0004] The purpose of the present invention is solved as follows: A barbell / dumbbell quick locking device includes an inner cylinder with an axial through hole and an outer sleeve sleeved outside the inner cylinder. The outer side wall of the inner cylinder has a first tapered surface, and the inner wall of the outer sleeve is provided with a second tapered surface matching the first tapered surface. An inclined surface is provided on the outer side wall of the inner cylinder on the large-diameter side of the first tapered surface. An unlocking button for driving the axial movement of the inclined surface is provided on the transverse groove at the top of the outer sleeve. Steel balls are sleeved in the first through holes circumferentially spaced on the first tapered surface of the inner cylinder. An annular cover plate is connected to the end face of the outer sleeve on the groove side. A spring for driving the inner cylinder to move away from the cover plate is provided between the cover plate and the inner cylinder. The two ends of the spring are respectively abutted against the spring seats on the cover plate and the inner cylinder. The cover plate allows the unlocking button to move radially to drive the axial movement of the inner cylinder to unlock.

[0005] As a further optimization of the above technical solution, one or more protrusions are provided on the upper surface of the unlocking button, and a guiding groove for restricting the protrusions to move only horizontally is provided on the lower surface of the cover plate.

[0006] As a further optimization of the above technical solution, an inclined driving surface for driving the axial movement of the inclined surface to unlock is provided on the unlocking button.

[0007] As a further optimization of the above technical solution, there are two unlocking buttons, both of which are U-shaped bodies. The two unlocking buttons are symmetrically arranged in the four transverse grooves at the top of the outer sleeve. The inclined driving surfaces are provided at the ends of the two side walls of the U-shaped body, and there are also four inclined surfaces provided on the corresponding outer side wall of the inner cylinder to cooperate with the inclined driving surfaces to work.

[0008] As a further optimization of the above technical solution, a conical groove matching the first conical surface is provided on the inner wall of the outer sleeve, a conical ring is installed in the conical groove, and the inner wall surface of the conical ring has the second conical surface.

[0009] As a further optimization of the above technical solution, the first through hole on the inner cylinder is necked near the inner surface of the inner cylinder so that the inner diameter there is smaller than the outer diameter of the steel ball, so that the steel ball can move radially out of the first through hole without leaking into the axial through hole of the inner cylinder.

[0010] As a further optimization of the above technical solution, an axial groove is provided on the first conical surface between two adjacent first through holes on the inner cylinder.

[0011] As a further optimization of the above technical solution, a hollow hole penetrating the side wall of the inner cylinder is provided on the first conical surface on the upper side of the first through hole.

[0012] As a further optimization of the above technical solution, more than two guide grooves are arranged on the outer wall of the cylinder formed by the necking of the upper outer wall of the inner tube, and a guide block is arranged on the inner wall of the cover plate to be inserted into the guide groove and cooperate with the axial movement of the inner tube.

[0013] As a further optimization of the above technical solution, an annular groove is provided on the upper surface of the cover plate, and bolt mounting holes are circumferentially arranged at intervals on the annular groove. The cover plate is screwed into the threaded holes on the outer sleeve by bolts passing through the bolt mounting holes.

[0014] Compared with the prior art, the present invention has the following positive effects: 1. The present invention utilizes the relative movement of the inner cylinder and the outer cylinder to drive the movement of the steel column to achieve locking or unlocking.

[0015] 2. The present invention utilizes symmetrically arranged unlocking buttons, and the two unlocking handles can be pressed simultaneously with the fingers of one hand to quickly unlock the door, saving effort, time, and quick positioning.

[0016] 3. In the present invention, one or more springs are circumferentially arranged between the cover plate and the inner cylinder to drive the inner cylinder to move away from the cover plate to form a locking force. The size and amount of the elastic force of the spring can be selected as needed.

[0017] 4. Compared with other quick-release products, the present invention can greatly shorten the axial length, further improve the product's appearance and structural aesthetics, and improve the overall coordination of the product.

[0018] 5. The present invention ingeniously uses the oblique wedge principle to push the quick release mechanism from the front. The more it is pushed, the tighter the lock becomes. This can reliably solve various impacts of the barbell during use and achieve reliable locking. When unlocking, it can also be unlocked quickly, easily and labor-savingly.

[0019] 6. The present invention utilizes the contact between the metal outer ring and the steel balls to increase the contact stiffness, greatly enhancing the reliability of locking and the product life, and solving the problem of insufficient contact stiffness of the outer sleeve using plastic parts.

[0020] 7. The structure of the present invention is simple, easy to use, stable in performance, and firmly locked, and is suitable for the locking and positioning of components on shafts or pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is one of the perspective schematic diagrams of the present invention.

[0022] Figure 2 is the front view of the present invention.

[0023] Figure 3 is Figure 2 the sectional view taken along the A-A direction of

[0024] Figure 4 is the perspective schematic diagram of the present invention after removing the cover plate.

[0025] Figure 5 is the exploded view of the present invention.

[0026] Figure 6 is the second perspective schematic diagram of the present invention.

[0027] Figure 7 is the sectional schematic diagram of the present invention installed on the main shaft.

[0028] Figure 8 is the perspective schematic diagram of the cover plate of the present invention.

[0029] Figure 9 is the perspective schematic diagram of the outer sleeve of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following further describes the present invention with specific embodiments in conjunction with the drawings. Refer to Figures 1-9 : For the convenience of description, the up and down in the text refer to the axial direction with the cover plate as the upper part. The cover plate covers the upper end of the outer sleeve, so the outer sleeve is the lower part. Taking Figure 3 's left and right as left and right, and taking Figure 3 's up and down as up and down. The first and second among them do not refer to their importance either, but are merely the naming of some components.

[0031] A barbell / dumbbell quick locking device, comprising an inner cylinder 20 with an axial through hole 23 and an outer sleeve 40 sleeved outside the inner cylinder 20. The outer side wall of the inner cylinder 20 has a first conical surface 21, and a second conical surface 51 matching the first conical surface 21 is arranged on the inner wall of the outer sleeve 40. An inclined surface 24 is arranged on the outer side wall of the inner cylinder 20 on the large diameter side of the first conical surface 21. An unlocking button 30 for driving the axial movement of the inclined surface 24 is arranged on the top transverse groove 42 of the outer sleeve 40. Steel balls 60 are sleeved in first through holes 22 circumferentially and spaced on the first conical surface 21 of the inner cylinder 20. An annular cover plate 10 is connected to the end face 44 of the outer sleeve 40 on the side of the top transverse groove 42. A spring 80 for driving the inner cylinder 20 to move away from the cover plate 10 is arranged between the cover plate 10 and the inner cylinder 20. The two ends of the spring 80 respectively abut on the respective spring seats 15 and 29 on the cover plate 10 and the inner cylinder 20. The cover plate 10 allows the unlocking button 30 to move radially to drive the axial movement of the inner cylinder 20 to unlock.

[0032] As a further optimization of the above technical solution, one or more bumps 32 are arranged on the upper surface of the unlocking button 30, and a guiding groove 14 for restricting the bumps 32 to move only horizontally is arranged on the lower surface of the cover plate 10.

[0033] As a further optimization of the above technical solution, an inclined driving surface 31 for driving the axial movement of the inclined surface 24 to unlock is arranged on the unlocking button 30.

[0034] As a further optimization of the above technical solution, there are two unlocking buttons 30, both of which are U-shaped bodies. The two unlocking buttons 30 are symmetrically arranged in four transverse grooves 42 at the top of the outer sleeve 40. The inclined driving surfaces 31 are arranged at the ends of the two side walls of the U-shaped body. There are also four inclined surfaces 24 arranged on the corresponding outer side wall of the inner cylinder 20 to cooperate with the inclined driving surfaces 31.

[0035] As a further optimization of the above technical solution, a conical groove 41 matching the first conical surface 21 is arranged on the inner wall of the outer sleeve 40. A conical ring 50 is installed in the conical groove 41, and the inner wall surface of the conical ring 50 has the second conical surface 51.

[0036] As a further optimization of the above technical solution, the first through holes 22 on the inner cylinder 20 are necked down near the inner surface of the inner cylinder 20 so that the inner diameter at this place is smaller than the outer diameter of the steel balls 60, so as to facilitate the radial movement of the steel balls 60 at the first through holes 22 and prevent them from leaking into the axial through hole 23 of the inner cylinder 20.

[0037] As a further optimization of the above technical solution, an axial slotted groove 26 is provided on the first conical surface 21 between two adjacent first through holes 22 on the inner cylinder 20.

[0038] As a further optimization of the above technical solution, a hollowed-out hole 25 penetrating the side wall of the inner cylinder 20 is provided on the first conical surface 21 above the first through hole 22.

[0039] As a further optimization of the above technical solution, more than two guiding grooves 28 are provided on the outer wall of the cylinder 27 formed by the necking of the outer wall of the upper part of the inner cylinder 20, and guiding blocks 13 that are snapped into the guiding grooves 28 and cooperate with the axial movement of the inner cylinder 20 are provided on the inner wall of the cover plate 10.

[0040] As a further optimization of the above technical solution, an annular groove 11 is provided on the upper surface of the cover plate 10, bolt mounting holes 12 are circumferentially and spacedly provided on the annular groove 11, and the cover plate 10 is screwed into the threaded hole 43 on the outer sleeve 40 through the bolt mounting holes 12 by bolts.

[0041] See Figure 7 : Use of the present invention: 1. Locking: Press the unlocking button 30 to be in the unlocked state, sleeved the cover plate 10 inwardly on the main shaft 70 and push the outer sleeve 40 inwardly. When the front section of the inner cylinder 10 abuts against the positioned member 71 on the main shaft 70, the outer sleeve 40 drives the conical ring 50 to move leftward. After releasing the unlocking button 30, under the spring force of the spring 80, the conical ring 50 squeezes the steel balls 60 to move radially toward the axis side, and the relative movement between the outer sleeve 40 and the inner cylinder 10 pushes out the steel balls 60, so that the positioned member 71 can be fixed or locked on the main shaft 70.

[0042] 2. Unlocking: Press the unlocking button 30, and the unlocking button 30 drives the inner cylinder 10 to axially move relative to the outer sleeve 20 with the elastic force of the spring 80. The steel balls 60 are radially extruded outward by the main shaft 70 and move radially outward in the first through hole 22. The steel balls 60 no longer apply force to the main shaft 70, and then the unlocking button 30 can be axially pushed to the right to drive the inner cylinder 10 to move to the right to unlock.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still make simple substitutions or modifications to the technical solutions or technical features recorded in the foregoing embodiments with similar technologies, and these simple substitutions or modifications do not make the essence of the corresponding technical solutions deviate from the spirit and essence of the technical solutions of the embodiments of the present invention, and are still within the protection scope of the present invention.

Claims

1. A barbell / dumbbell quick locking device, characterized in that: It includes an inner cylinder with an axial through hole and an outer sleeve sleeved outside the inner cylinder. The outer side wall of the inner cylinder has a first tapered surface, and a second tapered surface matching the first tapered surface is provided on the inner wall of the outer sleeve. An inclined surface is provided on the outer side wall of the inner cylinder on the large-diameter side of the first tapered surface. An unlocking button for driving the axial movement of the inclined surface is provided on the transverse groove at the top of the outer sleeve. Steel balls are sleeved in the first through holes circumferentially spaced on the first tapered surface of the inner cylinder. An annular cover plate is connected to the end surface of the outer sleeve on the groove side. A spring for driving the inner cylinder to move away from the cover plate is provided between the cover plate and the inner cylinder. The two ends of the spring are respectively abutted against the respective spring seats on the cover plate and the inner cylinder.

2. The quick locking device for barbell / dumbbell according to claim 1, characterized in that: One or more bumps are provided on the upper surface of the unlocking button, and a guiding groove for restricting the bumps to move only horizontally is provided on the lower surface of the cover plate.

3. The quick locking device for barbell / dumbbell according to claim 2, wherein: An inclined driving surface for driving the axial movement of the inclined surface to unlock is provided on the unlocking button.

4. A barbell / dumbbell quick locking device according to claim 3, characterized in that: There are two unlocking buttons, both of which are U-shaped bodies. The two unlocking buttons are symmetrically arranged in the four transverse grooves at the top of the outer sleeve. The inclined driving surfaces are provided at the ends of the two side walls of the U-shaped body. There are also four inclined surfaces provided on the outer side wall of the corresponding inner cylinder to cooperate with the inclined driving surfaces.

5. The quick locking device for barbell / dumbbell according to claim 1, characterized in that: A tapered groove matching the first tapered surface is provided on the inner wall of the outer sleeve. A tapered ring is installed in the tapered groove, and the inner wall surface of the tapered ring has the second tapered surface.

6. The quick locking device for a barbell / dumbbell according to claim 1, characterized in that: The first through holes on the inner cylinder are necked down near the inner surface of the inner cylinder so that the inner diameter at this place is smaller than the outer diameter of the steel balls, facilitating the radial movement of the steel balls at the first through holes and preventing them from leaking into the axial through hole of the inner cylinder.

7. The quick locking device for barbell / dumbbell according to claim 1, wherein: Axial slots are provided on the first tapered surface between two adjacent first through holes on the inner cylinder.

8. A barbell / dumbbell quick locking device according to claim 7, characterized in that: Hollow holes penetrating the side wall of the inner cylinder are provided on the first tapered surface above the first through holes.

9. The quick locking device for a barbell / dumbbell according to claim 1, characterized in that: Two or more guiding grooves are provided on the outer wall of the cylinder formed by the necking down of the upper outer wall of the inner cylinder. Guiding blocks for engaging with the guiding grooves to cooperate with the axial movement of the inner cylinder are provided on the inner wall of the cover plate.

10. A barbell / dumbbell quick locking device according to claim 9, characterized in that: An annular groove is provided on the upper surface of the cover plate. Bolt mounting holes are circumferentially spaced on the annular groove. The cover plate is screwed into the threaded holes on the outer sleeve through the bolt mounting holes by bolts.

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