A force-saving pivot with a double-ringed concave-convex surface

Abstract

This disclosure relates to a force-saving pivot with a double-ring concave-convex surface. The force-saving pivot includes a first connector, a second connector, a cam assembly, and a torque module. The first connector has a shaft body; the second connector is sleeved on the shaft body; the cam assembly includes a first fixed cam, a second fixed cam, and a movable cam, with the first and second fixed cams fixed to the shaft body. The first fixed cam has a first double-ring concave-convex surface, and the second fixed cam has a second double-ring concave-convex surface; the movable cam is rotatably sleeved on the shaft body and has a slot; the second connector has a rod inserted into the slot; the movable cam has a third double-ring concave-convex surface abutting against the first double-ring concave-convex surface and a fourth double-ring concave-convex surface abutting against the second double-ring concave-convex surface; the torque module is sleeved on the shaft body and elastically supported by the cam assembly.

Claims

1. A force-saving pivot with a double-ringed concave-convex surface, comprising: A first connector having a shaft; at least one second connector rotatably fitted onto the shaft; a cam assembly comprising: a first fixed cam fitted onto the shaft, the first fixed cam having a first double-ringed concave-convex surface; a second fixed cam fitted onto the shaft, the second fixed cam having a second double-ringed concave-convex surface; and a movable cam rotatably fitted onto the shaft and sandwiched between the first fixed cam and the second fixed cam, the movable cam having a slot for one of the at least one second connector and a rod inserted into the slot for the other, allowing the movable cam to approach or move away from the second connector, the movable cam having a third double-ringed concave-convex surface and a fourth double-ringed concave-convex surface formed on its two sides, the third double-ringed concave-convex surface abutting against the first double-ringed concave-convex surface, and the fourth double-ringed concave-convex surface abutting against the second double-ringed concave-convex surface; and a torque module fitted onto the shaft and elastically supported by the cam assembly.

2. The force-saving pivot with double-ring concave-convex surfaces as described in claim 1, wherein the first double-ring concave-convex surface has a first inner oblique ring and a first outer oblique ring arranged concentrically, and the third double-ring concave-convex surface has a second inner oblique ring and a second outer oblique ring arranged concentrically, the second inner oblique ring abutting against the first inner oblique ring, and the second outer oblique ring abutting against the first outer oblique ring.

3. The double-ringed concave-convex pivot as described in claim 2, wherein the first inner oblique ring has a first protruding section protruding from one side of the first outer oblique ring, a first recessed section recessed on the other side of the first outer oblique ring, and two first ramp sections disposed between the first protruding section and the first recessed section; the first outer oblique ring has a second recessed section disposed outside the first protruding section, a second protruding section disposed outside the first recessed section, and two second ramp sections disposed between the second recessed section and the second protruding section.

4. The double-ringed concave-convex pivot as described in claim 2, wherein the second inner oblique ring has a third protruding section protruding from one side of the second outer oblique ring, a third recessed section recessed on the other side of the second outer oblique ring, and two third ramp sections disposed between the third protruding section and the third recessed section; the second outer oblique ring has a fourth recessed section disposed outside the third protruding section, a fourth protruding section disposed outside the third recessed section, and two fourth ramp sections disposed between the fourth recessed section and the fourth protruding section.

5. The force-saving pivot with a double-ring concave-convex surface as described in claim 1, wherein the second double-ring concave-convex surface has a second inner flat ring and a second outer flat ring arranged concentrically, the second inner flat ring extending with a first trapezoidal protrusion, the second outer flat ring extending with a second trapezoidal protrusion, the fourth double-ring concave-convex surface has a third inner flat ring and a third outer flat ring arranged concentrically, the third inner flat ring having a first trapezoidal recess that can engage with the first trapezoidal protrusion, and the third outer flat ring having a second trapezoidal recess that can engage with the second trapezoidal protrusion.

6. The double-ringed concave-convex pivot as described in claim 5, wherein the first trapezoidal protrusion and the second trapezoidal protrusion are located on opposite sides of the second fixed cam, and the first trapezoidal recess and the second trapezoidal recess are located on opposite sides of the movable cam.

7. The double-ringed concave-convex pivot as described in claim 1, wherein an extension section extends outward from one side of the outer periphery of the movable cam, the slot is opened from the extension section, the second connector is provided with a fixing hole, and the insert is inserted into the fixing hole.

8. The double-ring concave-convex surface of the first connector as described in claim 7, wherein the first connector has the shaft body at one end and a first connecting portion at the other end, the first connector further having a stop block disposed between the shaft body and the first connecting portion, the stop block having a semi-annular groove on its outer periphery, and the second connector further having a sleeve ring rotatably fitted onto the shaft body and sandwiched between the stop block and the cam assembly, the sleeve ring extending having a protrusion that can slide in the semi-annular groove.

9. The double-ring concave-convex surface of the pivot as described in claim 8, wherein the first connecting part is a fixed rod extending from one end of the shaft, and the outer periphery of the shaft has two arc segments and two planar segments disposed between the two arc segments.

10. The double-ringed concave-convex pivot as described in claim 8, wherein the second connecting member extends from the outer periphery of the collar into a straight rod, the fixing hole is provided on the straight rod, and the end of the straight rod away from the collar has a second connecting portion.

11. The double-ringed concave-convex pivot as claimed in claim 10, wherein the number of second connectors is two, the two second connectors are joined together left and right, the protrusion extends from the collar adjacent to the stop block, and the second connection portion of the two second connectors is two fixing plates extending in opposite directions along an axial direction parallel to the shaft.

12. The double-ringed concave-convex pivot as claimed in claim 1, further comprising a nut secured to the end of the shaft, the torque module being sandwiched between the cam assembly and the nut, the torque module comprising a plurality of abutting springs or including a helical spring, the plurality of springs or the helical spring being sandwiched between the second fixed cam and the nut.

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