Measuring tape with improved standout
A blade for a measuring tape device may include a first end configured to extend from a housing of the measuring tape device through an aperture, a second end configured to be wound on a reel assembly within the housing, and a first cupped portion having a first amount of cupping over a selected portion of a longitudinal length of the blade. The first cupped portion may be defined by a curved portion extending from an apex of the curved portion toward lateral edges of the blade, and wings extending from each of the lateral edges toward the curved portion on each side of the apex. The curved portion includes a first radius proximate to the apex of the curved portion, and a second radius at a point spaced apart from the apex on both sides of the apex, the second radius being different than the first radius.
1. A blade for a measuring tape device, the blade comprising:
a first end configured to extend from a housing of the measuring tape device through an aperture;
a second end configured to be wound on a reel assembly within the housing; and
a first cupped portion having a first amount of cupping over a selected portion of a longitudinal length of the blade,
wherein the first cupped portion is defined by a curved portion extending from an apex of the curved portion toward lateral edges of the blade, and wings extending from each of the lateral edges toward the curved portion on each side of the apex,
wherein the first cupped portion is spaced apart from the first end and the second end of the blade to extend over a critical region of the blade at which maximum standout is expected to occur,
wherein a second amount of cupping is provided at a second cupped portion of the blade outside of the first cupped portion,
wherein lengths of the wings in the first cupped portion is smaller than a length of wings in the second cupped portion,
wherein a droop breakthrough standout of the blade is greater than 13.0 feet,
wherein a utility breakthrough standout of the blade is greater than 12.0 feet, and
wherein a maximum breakthrough standout of the blade is greater than 13.5 feet.
2. The blade of claim 1 , wherein the curved portion includes a first radius proximate to the apex of the curved portion, and a second radius at a point spaced apart from the apex on both sides of the apex, the second radius being different than the first radius.
3. The blade of claim 1 , wherein a stress relief operation applied to the selected portion on only a convex side of the blade causes the first amount of cupping to be larger than a second amount of cupping provided at a second cupped portion of the blade outside of the first cupped portion.
4. The blade of claim 1 , wherein the first amount of cupping is at least 20% greater than the second amount of cupping.
5. The blade of claim 1 , wherein a transition zone is defined between the selected portion and the other portions, and wherein an amount of cupping in the transition zone transitions from the first amount of cupping to the second amount of cupping, and wherein the transition zone is greater than half an inch long.
6. The blade of claim 1 , wherein a ratio standout to width of the blade is greater than 116.1.
7. The blade of claim 1 , wherein a ratio of standout to blade thickness of at least 28,000.
8. The blade of claim 1 , wherein a ratio of standout to weight is at least 250.
9. The blade of claim 8 , wherein a maximum blade width in the second cupped portion is at least 20% larger than minimum blade width in the first cupped portion.
10. The blade of claim 8 , wherein a cross section of the blade defines a parabolic shape extending from the apex toward each respective one of the wings.
11. The blade of claim 8 , wherein a length of the wings is less than about 0.14 inches.
12. The blade of claim 8 , wherein a change in a ratio of width to height between the first cupped portion and the second cupped portion is greater than 40%.
13. The blade of claim 1 , wherein surface roughness on a convex side of the blade in the selected portion is higher than surface roughness of a concave side of the blade.
14. The blade of claim 1 , wherein surface roughness on a convex side of the blade in the selected portion is higher than surface roughness of the concave side of the blade outside the selected portion.
15. The blade of claim 1 , wherein surface roughness is substantially constant over a concave side of the blade, and wherein the surface roughness on a convex side of the blade changes along the longitudinal length of the blade.
16. The blade of claim 1 , wherein a standout of the blade is greater than about 13 feet.
17. A measuring tape device comprising:
a housing having an aperture;
a reel assembly; and
a blade, the blade comprising:
a first end configured to extend from the housing of the measuring tape device through the aperture;
a second end configured to be wound on the reel assembly within the housing; and
a first cupped portion having a first amount of cupping over a selected portion of a longitudinal length of the blade,
wherein the first cupped portion is defined by a curved portion extending from an apex of the curved portion toward lateral edges of the blade, and wings extending from each of the lateral edges toward the curved portion on each side of the apex,
wherein the first cupped portion is spaced apart from the first end and the second end of the blade to extend over a critical region of the blade at which maximum standout is expected to occur,
wherein a second amount of cupping is provided at a second cupped portion of the blade outside of the first cupped portion,
wherein lengths of the wings in the first cupped portion is smaller than a length of wings in the second cupped portion,
wherein a droop breakthrough standout of the blade is greater than 13.0 feet,
wherein a utility breakthrough standout of the blade is greater than 12.0 feet, and
wherein a maximum breakthrough standout of the blade is greater than 13.5 feet.
18. The device of claim 17 , wherein a stress relief operation applied to the selected portion on only a convex side of the blade causes the first amount of cupping to be larger than a second amount of cupping provided at a second cupped portion of the blade outside of the first cupped portion.
19. The device of claim 17 , wherein the first amount of cupping is at least 20% greater than the second amount of cupping.
20. The device of claim 17 , wherein a transition zone is defined between the selected portion and the other portions, and wherein an amount of cupping in the transition zone transitions from the first amount of cupping to the second amount of cupping, and wherein the transition zone is greater than half an inch long.