Tape measure with finger drag brake
View Patent ↗A tape measure has a finger recess in a housing, with at least a portion of the underside of a tape blade exposed in the finger recess. Pressing a finger against the underside of the tape allows the user to create a drag brake that acts against the retraction spring to slow and/or stop the retraction of the tape blade. The finger recess is located upstream (i.e. closer to the coiled portion of the retracted tape blade) than the point at which the tape measure's lock engages the tape blade. This arrangement results in a compact yet versatile overall tape measure with good tactile feedback during finger-braking.
1. A tape measure, comprising:
a housing having an exit port and a finger recess;
a spring disposed in the housing;
a tape blade having measuring indicia thereon, the tape blade moveable between a deployed configuration where the tape blade extends forwardly outward from the housing at the exit port and a retracted configuration where the tape blade is substantially retracted into the housing; the tape blade biased toward the retracted configuration by the spring;
a lock movably disposed in the housing and movable between an unlocked position in spaced relation to the tape blade and a locked position engaged with an upper surface of the tape blade at a blade engagement location so as to inhibit retraction of the tape blade;
wherein the tape blade exits the housing at the exit port in the deployed configuration;
wherein a laterally central portion of an underside surface of the tape blade is externally exposed in the finger recess;
wherein the exit port is disposed forwardly relative to the blade engagement location;
wherein the finger recess is disposed rearwardly relative to the blade engagement location.
2. The tape measure of claim 1 further comprising an end hook slidably mounted to a distal end portion of the tape blade; wherein the end hook extends through the exit port when the tape blade is in the retracted configuration; wherein the end hook comprises first and second downwardly extending legs.
3. The tape measure of claim 1 wherein lateral edges of the tape blade, for a longitudinal portion of the tape blade disposed in the finger recess, are protected by the housing so as to be not externally exposed.
4. The tape measure of claim 1 wherein the tape blade naturally assumes a concavo-convex cross-sectional configuration when deployed from the housing.
5. The tape measure of claim 1 wherein the tape blade forms a convolute coil on a drum in the retracted configuration, the drum disposed in the housing and rotatable relative thereto about a rotational axis; wherein the finger recess is disposed forwardly relative to the rotational axis.
6. The tape measure of claim 1 wherein a portion of tape blade disposed in the finger recess has a downstream cross-section disposed closer to the exit port and an upstream cross-section disposed farther from the exit port; wherein the downstream cross-section has a greater height than the upstream cross-section.
7. The tape measure of claim 1 wherein the housing comprises a generally planar lower surface that extends forwardly and rearwardly of the finger recess.
8. The tape measure of claim 1 :
wherein the housing comprises lateral sidewalls;
wherein the finger recess extends across a bottom of the housing and partially along the sidewalls and tapers into the sidewalls.
9. The tape measure of claim 1 :
wherein lateral edges of the tape blade, for a longitudinal portion of the tape blade disposed in the finger recess, are protected by the housing so as to be not externally exposed;
wherein the tape blade naturally assumes a concavo-convex cross-sectional configuration when deployed from the housing;
wherein the tape blade forms a convolute coil on a drum in the retracted configuration, the drum disposed in the housing and rotatable relative thereto about a rotational axis; wherein the finger recess is disposed forwardly relative to the rotational axis;
wherein the housing comprises lateral sidewalls;
wherein the finger recess extends across a bottom of the housing and partially along the sidewalls and tapers into the sidewalls.
10. A method of operating a tape measure, the tape measure having a housing and a tape blade selectively deployable from the housing, the tape measure including a lock movably disposed in the housing and movable between an unlocked position in spaced relation to the tape blade and a locked position engaged with an upper surface of the tape blade at a blade engagement location so as to inhibit retraction of the tape blade, the housing having a finger recess, the method comprising:
deploying a portion of the tape blade forwardly from the housing;
thereafter retracting at least a segment of the portion of the tape blade into the housing via a retraction spring while the lock is in the unlocked position;
during the retracting, pressing a finger upward against a underside surface of the tape blade that is exposed in the finger recess;
wherein the finger recess is disposed rearwardly relative to the blade engagement location.
11. The method of claim 10 wherein pressing a finger upward against the underside surface comprises pressing the finger against a laterally central portion of a segment of the tape blade while the corresponding lateral edges of the segment are protected by the housing so as to be unexposed.
12. The method of claim 10 wherein a portion of tape blade disposed in the finger recess has a downstream cross-section disposed closer to the exit port and an upstream cross-section disposed farther from the exit port; wherein the downstream cross-section has a greater height than the upstream cross-section.
13. The method of claim 10 wherein the pressing the finger upward against the underside surface of the tape blade causes the retracting to stop.
14. The method of claim 13 further comprising thereafter removing the finger from the underside surface of the tape blade and fully retracting the tape blade.