A dumbbell has a core rod and a cloth cover. The core rod has a supporting rod and a bag. The bag is mounted around the supporting rod. A first filling space is formed between the supporting rod and the bag. The first filling space is filled with a weight material. The cloth cover is mounted around the core rod and seals the core rod. The cloth cover has a holding portion and two weight portions. The two weight portions are respectively formed at two ends of the holding portion. A second filling space is formed between the core rod and the holding portion. The second filling space is filled with the weight material. A respective third filling space is formed between the core rod and each one of the two weight portions.
1. A dumbbell comprising:
a core rod having
a supporting rod; and
a bag mounted around the supporting rod, and a first filling space formed between the supporting rod and the bag;
a cloth cover mounted around the core rod and having
a holding portion being elongated and having two ends; and
two weight portions respectively formed at the two ends of the holding portion, a second filling space formed between the core rod and the holding portion, a diameter of each one of the two weight portions being larger than a diameter of the holding portion, a respective third filling space formed between the core rod and each of the two weight portions, wherein the first filling space, the second filling spaces, and the two third filling spaces are filled with a weight material.
2. The dumbbell as claimed in claim 1 , wherein each one of the two weight portions has
an inner cloth having an inner edge and an outer edge, the inner edge of the inner cloth connected to the holding portion;
an annular cloth connected to the outer edge of the inner cloth; and
an outer cloth connected to the annular cloth.
3. The dumbbell as claimed in claim 2 , wherein the annular cloth has
an opening formed through the annular cloth;
an injecting tube connected with the opening and communicating with the third filling space; and
an extending tube fixed to and communicating with the injecting tube.
4. The dumbbell as claimed in claim 2 , wherein the bag has a top end and a bottom end, two sealing portions are each respectively formed at the top end and the bottom end of the bag, each one of the sealing portions has two edge sides connected with an inner surface of the cloth cover.
5. The dumbbell as claimed in claim 1 , wherein the weight material is iron sands.
6. The dumbbell as claimed in claim 2 , wherein the weight material is iron sands.
7. The dumbbell as claimed in claim 3 , wherein the weight material is iron sands.
8. The dumbbell as claimed in claim 4 , wherein the weight material is iron sands.
9. The dumbbell as claimed in claim 1 , wherein the cloth cover is made of neoprene.
10. The dumbbell as claimed in claim 2 , wherein the cloth cover is made of neoprene.
11. The dumbbell as claimed in claim 3 , wherein the cloth cover is made of neoprene.
12. The dumbbell as claimed in claim 4 , wherein the cloth cover is made of neoprene.