A double-pinion adjusting device
By employing a double-gear design and a guide rib limiting structure in the backpack shoulder strap adjuster, the problem of unbalanced force on a single gear is solved, enabling backpack shoulder strap adjustment with greater load-bearing capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU PALLAS PRECISION FASTENER TECH CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-14
AI Technical Summary
The single-gear design in existing backpack shoulder strap adjusters results in unbalanced force distribution, leading to low tensile strength.
It adopts a double gear design, which uses the cooperation of the left and right gears with the left and right racks, combined with the power mechanism to drive the rack to move up and down. The guide ribs and limit structure ensure smooth movement and strength.
The backpack shoulder strap adjuster has improved the force balance and enhanced its ability to withstand tensile forces.
Smart Images
Figure CN224483258U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a backpack shoulder strap adjuster, specifically a dual-gear adjustment device. Background Technology
[0002] We previously designed a backpack shoulder strap adjuster (patent number: 202323328598.0). During its use, we found that the design of a single rack and pinion with a single gear was not very balanced in terms of tension and could not withstand much tension. Utility Model Content
[0003] In view of the above problems, this utility model proposes a dual-gear adjustment device.
[0004] Technical solution of this utility model
[0005] A dual-gear adjustment device includes a base, a gear rail, gears, and a power mechanism. The gear rail and gears are mounted on the base. The gear rail has two racks: one rack is located on the left side of the gear rail (left rack), and the other rack is located on the right side of the gear rail (right rack). There are two gears: one gear meshes with the left rack (left gear), and the other gear meshes with the right rack (right gear). The power mechanism is connected to the left and right gears. The power mechanism drives the left and right gears to rotate, and under the drive of the left and right gears, the gear rail moves up and down.
[0006] Further refining the above technical solution, the left rack is opposite to the right rack; the left gear meshes with the right gear; and the left rack is staggered from the right rack vertically.
[0007] To further refine the above technical solution, the toothed rail body has a hole in the middle, the left side wall of the hole is toothed to form a left toothed rack, and the right side wall of the hole is toothed to form a right toothed rack.
[0008] Further refining the above technical solution, the left or right gear is the driving gear; the power mechanism is a knob, which is mounted on the base and connected to the driving gear.
[0009] To further refine the above technical solution, the adjustment device also includes a ratchet structure, which is mounted on a base and connected to a knob and / or a drive gear.
[0010] Further refining the above technical solution, the base is provided with a vertical through hole, and the toothed rail is disposed in the vertical through hole and is clearance-fitted with the vertical through hole; the base is composed of a front cover and a rear cover connected together, and the vertical through hole is formed by half-grooves provided on the front cover and the rear cover.
[0011] Further refining the above technical solution, the front cover is provided with several baffles, and each baffle forms the outline positioning of the rear cover; this makes it more convenient to assemble the front cover and the rear cover.
[0012] (Left rack meshes with left gear, left gear meshes with right gear, right gear meshes with right rack) To ensure smooth up-and-down movement of the gear rail and smooth rotation of the left and right gears, the above technical solution is further refined. The gear rail is provided with guide ribs, and the inner wall of the vertical through hole is provided with guide notches. The guide ribs are placed in the guide notches, and they cooperate with the guide notches to form the side limit of the gear rail; effectively preventing gear rail deviation; at the same time, the design of the guide ribs increases the strength of the upper gear rail to a certain extent.
[0013] Further refining the above technical solution, the guide ribs and guide notches are semicircles.
[0014] Further refining the above technical solution, the left gear and right gear are located inside the vertical through hole; the upper end of the toothed rail extends from the upper port of the vertical through hole and is provided with an upper protrusion, and the lower end of the toothed rail extends from the lower port of the vertical through hole and is provided with a lower protrusion. The upper protrusion constitutes the lower limit of the toothed rail, and the lower protrusion constitutes the upper limit of the toothed rail.
[0015] The advantages of this utility model are that it has a reasonable design, simple structure, and changes from a single gear to a double gear design, which balances the tensile force and increases the tensile force it can withstand. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a dual-gear adjustment device.
[0017] Figure 2 This is a partial explosion diagram of a dual-gear adjustment device.
[0018] Figure 3 This is a schematic diagram of the base structure.
[0019] Figure 4 This is a schematic diagram of the gear train structure.
[0020] The diagram includes: base 1, vertical through hole 1-1, front cover 1-2, rear cover 1-3, flange 1-4, guide notch 1-5, gear rail 2, gear rail body 2-1, left rack 2-2, right rack 2-3, guide rib 2-4, upper protrusion 2-5, lower protrusion 2-6, left gear 3, right gear 4, knob 5, and ratchet structure 6. Detailed Implementation
[0021] like Figure 1-4 As shown:
[0022] A dual-gear adjustment device, comprising a base 1, a gear rail 2, a left gear 3, a right gear 4, a knob 5, and a ratchet structure 6;
[0023] The base 1 is provided with a vertical through hole 1-1; the base 1 is composed of a front cover 1-2 and a rear cover 1-3 connected together, and the vertical through hole 1-1 is formed by the half-grooves provided on the front cover 1-2 and the rear cover 1-3; the front cover 1-1 is provided with several baffles 1-4, and each baffle 1-4 forms the outline positioning of the rear cover 1-3; the inner wall of the vertical through hole 1-1 is provided with a guide notch 1-5;
[0024] The toothed rail 2 is installed on the base 1; the toothed rail body 2-1 has a hole in the middle, the left side wall of the hole is toothed to form the left toothed rack 2-2, and the right side wall of the hole is toothed to form the right toothed rack 2-3; the left toothed rack 2-2 and the right toothed rack 2-3 are staggered vertically; the toothed rail 2 is provided with a guide rib 2-4; the toothed rail 2 is set in the vertical through hole 1-1 and is clearance-fitted with the vertical through hole 1-1; the guide rib 2-4 is placed in the guide notch 1-5, and it fits with the guide notch 1-5 to form the side limit of the toothed rail 2; the upper end of the toothed rail 2 extends from the upper port of the vertical through hole 1-1 and is provided with an upper protrusion 2-5, and the lower end of the toothed rail 2 extends from the lower port of the vertical through hole 1-1 and is provided with a lower protrusion 2-6. The upper protrusion 2-5 forms the lower limit of the toothed rail 2, and the lower protrusion 2-6 forms the upper limit of the toothed rail 2;
[0025] Left gear 3 and right gear 4 are mounted on base 1; left gear 3 meshes with left rack 2-2, right gear 4 meshes with right rack 2-3; left gear 3 meshes with right gear 4; left gear 3 and right gear 4 are located in vertical through hole 1-1;
[0026] Knob 5 is mounted on base 1 and is connected to right gear 4;
[0027] The ratchet structure 6 is mounted on the base 1, and the ratchet structure 6 connects the knob 5 and the right gear 4.
[0028] The above embodiments are only for illustrating the technical concept and features of the utility model, and are intended to enable those skilled in the art to understand the content of the utility model and implement it accordingly. They should not be construed as limiting the scope of protection of the utility model. All equivalent changes or modifications made in accordance with the spirit and essence of the utility model should be covered within the scope of protection of the utility model.
Claims
1. A dual-gear adjusting device, the adjusting device comprising a base, a gear rail, gears, and a power mechanism, wherein the gear rail and gear are mounted on the base; characterized in that, The toothed rail has two racks, one rack located on the left side of the toothed rail (left rack) and the other rack located on the right side of the toothed rail (right rack); there are two gears, one gear meshes with the rack of the left rack (left gear) and the other gear meshes with the rack of the right rack (right gear); the power mechanism is connected to the left gear and the right gear; The power mechanism drives the left and right gears to rotate, and the gear track moves up and down under the drive of the left and right gears.
2. The dual-gear adjusting device according to claim 1, characterized in that, The left rack is opposite to the right rack; the left gear meshes with the right gear, and the left rack is offset from the right rack vertically.
3. The dual-gear adjusting device according to claim 2, characterized in that, The toothed rail body has a hole in the middle, the left side wall of the hole is toothed to form a left toothed rack, and the right side wall of the hole is toothed to form a right toothed rack.
4. The dual-gear adjusting device according to claim 2, characterized in that, The left or right gear is the driving gear; the power mechanism is a knob, which is mounted on the base and connected to the driving gear.
5. A dual-gear adjusting device according to claim 4, characterized in that, The adjustment device also includes a ratchet structure mounted on a base, which is connected to a knob and / or a drive gear.
6. A dual-gear adjusting device according to claim 2, characterized in that, The base is provided with a vertical through hole, and the toothed rail is disposed in the vertical through hole and is clearance-fitted with the vertical through hole; The base is composed of a front cover and a rear cover connected together, and the vertical through hole is formed by the semi-grooves on the front cover and the rear cover.
7. A dual-gear adjusting device according to claim 6, characterized in that, The front cover is provided with several baffles, and each baffle forms the outline positioning of the rear cover.
8. A dual-gear adjusting device according to claim 6, characterized in that, The toothed rail is provided with guide ribs, and the inner wall of the vertical through hole is provided with guide notches. The guide ribs are placed in the guide notches and cooperate with the guide notches to form the side limit of the toothed rail.
9. A dual-gear adjusting device according to claim 8, characterized in that, The guide ribs and guide notches are semicircular.
10. A dual-gear adjusting device according to claim 5, characterized in that, The left and right gears are located inside the vertical through hole; the upper end of the gear rail extends from the upper port of the vertical through hole and is provided with an upper protrusion, and the lower end of the gear rail extends from the lower port of the vertical through hole and is provided with a lower protrusion. The upper protrusion constitutes the lower limit of the gear rail, and the lower protrusion constitutes the upper limit of the gear rail.