1. A buckle comprising:
a female portion comprising:
a hollow body with two sidewalls, an open receiving end and a locking end located opposite said receiving end;
an opening in said locking end, said opening being formed by said two sidewalls and having two ends and being wider in a central area than at said ends;
at least one locking slot in at least one of said sidewalls; and
a male portion comprising:
a base;
at least one locking arm connected to said base, said locking arm having a free end and a locking tab located at said free end; and
a shoulder portion located remote from said free end of said locking arm,
wherein inserting the male portion into the female portion compresses locking arm inward and causes the locking tab to pass fully through the opening in the locking end and wherein once the locking tab passes through the opening in the locking end the locking arm is released into a resting position where the tab rests against one of the ends of the opening in the locking end, to lock the male portion to the female portion,
wherein inserting the male portion into the female portion causes the shoulder to extend through the locking slot to abut a top end of the locking slot and further lock the male portion to the female portion, and
wherein the male portion is released from the female portion by pressing the shoulder portion inward until the shoulder portion clears the locking slot, which also moves the tab inward to the central area of the opening in the locking end, to release the male portion from the female portion.
2. The buckle according to claim 1, wherein there are two locking slots and two locking arms.
3. The buckle according to claim 1, further comprising a strap retaining bar disposed on at least one of the male and female portions.
4. The buckle according to claim 1, wherein the receiving end comprises a V-shaped groove and wherein the male portion has a corresponding V-shaped central section connected to said base, wherein inserting the male portion into the female portion causes the central section to rest in the groove to align the male portion with the female portion.
5. The buckle according to claim 4, wherein the central section has a mesh portion having a thickness that is less than a thickness of a surrounding area, said mesh portion having a plurality of apertures therethrough.
6. The buckle according to claim 1, wherein the locking end of the female portion extends longitudinally in the central area.
7. The buckle according to claim 1, wherein the shoulder portion comprises an upper ridge that forms an abutting surface, said abutting surface extending through the locking slot and abutting the female portion when the shoulder portion extends through the locking slot.
8. The buckle according to claim 1, wherein the ends of the opening have a V-shape and wherein the locking arm has a V-shaped cross section, so that when the male portion is fully inserted into the female portion, the locking arm fits securely into one of the ends of the opening.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A microwave oven, comprising:
an oven door, a heating chamber, and a magnetron, the oven door being installed in the front of the heating chamber, the heating chamber including a back wall,
a plurality of identical protrusions being disposed in a rectangular matrix on the back wall, wherein two of the plurality of identical protrusions disposed adjacent to each other tightly contact each other without any space between them,
each of the protrusions having a shape of a regular pyramid with four triangle reflecting surfaces meeting at one point towards an inside of the heating chamber, and
each of the reflecting surfaces being configured to reflect a microwave emitted by the magnetron.
2. The microwave oven of claim 1, wherein the protrusions are arranged uniformly on the back wall of the heating chamber.
3. The microwave oven of claim 1, wherein the protrusions and the back wall are punched into an integrated body.
4. The microwave oven of claim 1, wherein the protrusions are arranged throughout an entire surface of the back wall.
5. The microwave oven of claim 1, wherein the rectangular matrix is arranged throughout an entire surface of the back wall.