Hole saw with open end cap geometry
A tool, such as a hole saw, including an open end cap geometry is provided. The end cap includes spokes extending between a hub and a rim. A plurality of openings are defined between the spokes, hub and rim. The area of the openings is substantially large relative to the area of the end cap such that the end cap is relatively lightweight and provides access into the hole saw for debris removal. The spokes are shaped and positioned to provide strength to the end cap.
1 . A hole saw end cap, comprising:
a hub;
a rim defining an outer radius of the end cap;
a plurality of spokes extending radially outward from the hub toward the rim; and
a plurality of openings formed within the end cap, one of the plurality of openings located between each adjacent pair of the plurality of spokes and located radially between the hub and the rim;
wherein each of the plurality of spokes are curved in a clockwise direction;
wherein the rim includes a radially inward facing edge defining an inner radius of the end cap; and
wherein the inner radius of the end cap is between 90% and 99% of the outer radius of the end cap; and
wherein each spoke comprises a clockwise-facing surface and a counterclockwise-facing surface, both extending radially from the hub to the radially inward facing edge, wherein the clockwise-facing surface of each spoke is convex with respect to a center of the respective spoke, and the counterclockwise-facing surface of each spoke is concave with respect to the center of the respective spoke.
2 . The hole saw end cap of claim 1 , wherein the outer radius of the end cap is 3 inches.
3 . The hole saw of claim 1 , wherein the plurality of spokes is at least four spokes, and the plurality of openings is at least four openings formed within the end cap, wherein each spoke is spaced from an adjacent spoke by one of the plurality of openings.
4 . The hole saw end cap of claim 1 , wherein the plurality of spokes of the end cap comprise a first pair of spokes and a second pair of spokes, wherein each spoke in the first pair of spokes is a mirror image of the opposing spoke, and wherein each spoke in the second pair of spokes is a mirror image of the opposing spoke.
5 . The hole saw end cap of claim 1 , wherein the spokes have a tapered shape such that a circumferential thickness of each spoke increases as a distance from the radially inward facing edge increases.
6 . The hole saw end cap of claim 1 , further comprising a plurality of drive pin holes, the drive pin holes positioned on the hub and configured to receive the drive pins of an arbor of a driving device.
7 . A hole saw end cap, comprising:
a hub comprising an upper surface and a lower surface;
a rim defining an outer perimeter of the end cap;
a first pair of opposing spokes extending radially outward from the hub toward the rim, wherein each spoke in the first pair of opposing spokes comprises:
a first surface curved in a first direction; and
a second surface facing away from the first surface, the second surface curved in the first direction;
a second pair of opposing spokes extending radially outward from the hub toward the rim, wherein each spoke in the second pair of opposing spokes comprises:
a third surface curved in the first direction; and
a fourth surface facing away from the third surface, the fourth surface curved in the first direction; and
a first pair of openings defined within the end cap, a first opening one of the first pair of openings located between one of the first pair of opposing spokes and an adjacent one of the second pair of opposing spokes and located radially between the hub and the rim; and
a second pair of openings defined within the end cap, a second opening one of the second pair of openings located between one of the first pair of opposing spokes and an adjacent one of the second pair of opposing spokes and located radially between the hub and the rim;
wherein the first direction is clockwise with respect to the upper surface of the hub such that each of the first pair of opposing spokes and the second pair of opposing spokes are curved in a clockwise direction when the upper surface of the hub is facing outward.
8 . The hole saw end cap of claim 7 , the rim further comprising:
a first pair of radially inward facing edges that at least partially define the first pair of openings; and
a second pair of radially inward facing edges that at least partially define the second pair of openings;
wherein the first pair of radially inward facing edges and the second pair of radially inward facing edges are defined by a first radius.
9 . The hole saw end cap of claim 8 , wherein the outer perimeter of the end cap defines a second radius and wherein the first radius is between 90% and 99% of the second radius.
10 . The hole saw end cap of claim 8 , wherein the first pair of radially inward facing edges and second pair of radially inward facing edges are aligned curved surfaces and each have the same radius of curvature as each other.
11 . The hole saw end cap of claim 7 , wherein the first pair of openings are smaller than the second pair of openings.
12 . The hole saw end cap of claim 7 , wherein each first surface is a concave clockwise facing surface with respect to the center of the respective spoke and each second surface is a convex counterclockwise facing surface with respect to the center of the respective spoke.
13 . The hole saw end cap of claim 12 , wherein a length of the first surface is less than a length of the second surface.
14 . The hole saw end cap of claim 7 , further comprising a central hole located in a center of the hub and extending through the hub, wherein the central hole is configured to couple the hub to an arbor of a driving device.
15 . The hole saw end cap of claim 7 , wherein a first circumferential thickness of a first portion of each spoke of the first pair of opposing spokes adjacent to the hub is greater than a second circumferential thickness of a second portion of each spoke of the first pair of opposing spokes adjacent to the rim.
16 . A hole saw, comprising:
a sidewall comprising cutting teeth on a first end of the sidewall and a second end opposite the first end;
an end cap coupled to the second end of the sidewall, the end cap comprising:
a hub comprising an upper surface and a lower surface;
a central hole located in a center of the hub and extending through the hub, wherein the central hole is configured to couple the hub to an arbor of a driving device; and
a rim defining an outer perimeter of the end cap;
a first pair of opposing spokes extending radially outward from the hub toward the rim, each spoke of the first pair of opposing spokes comprising:
a first surface, wherein the first surface is convex with respect to the center of the respective spoke; and
a second surface positioned opposite the first surface, wherein the second surface is concave with respect to the center of the respective spoke;
a second pair of opposing spokes extending radially outward from the hub toward the rim, each spoke of the second pair of opposing spokes comprising:
a third surface, wherein the third surface is convex with respect to the center of the respective spoke; and
a fourth surface positioned opposite the third surface, wherein the fourth surface is concave with respect to the center of the respective spoke; and
an arbor coupled to the end cap, wherein when the arbor is rotated by a driving device, the arbor rotates the sidewall through the spokes to rotate the cutting teeth on the sidewall;
wherein each of the first pair of opposing spokes and the second pair of opposing spokes are curved in a clockwise direction when the upper surface of the hub is facing the arbor.
17 . The hole saw of claim 16 , the end cap further comprising:
a first pair of openings defined within the end cap, one of the first pair of openings located between one of the first pair of opposing spokes and an adjacent one of the second pair of opposing spokes and located radially between the hub and the rim;
a second pair of openings defined within the end cap, one of the second pair of openings located between one of the first pair of opposing spokes and an adjacent one of the second pair of opposing spokes and located radially between the hub and the rim;
a first pair of radially inward facing edges that at least partially define the first pair of openings; and
a second pair of radially inward facing edges that at least partially define the second pair of openings.
18 . The hole saw of claim 17 , wherein the first pair of radially inward facing edges and the second pair of radially inward facing edges are defined by a first radius and wherein the outer perimeter of the end cap defines a second radius and wherein the first radius is between 90% and 99% of the second radius.
19 . The hole saw of claim 16 , wherein a center of mass of each spoke of the first pair of opposing spokes is a first distance from the center of the hub and a second distance from the rim, and wherein the first distance is less than the second distance.