Wrench with reinforced hollow handle
View Patent ↗A wrench with a reinforced hollow handle includes a head portion, a hollow handle portion, and a neck portion between the head portion and the handle portion. The handle portion includes a front portion having a wall thickness greater than a wall thickness of a rear portion and includes a necking portion between the front and rear portions having a wall thickness greater than the wall thickness of the rear portion and smaller than the wall thickness of the front portion. The handle portion further includes an open rear end defining a rear end opening at the rear portion thereof. Furthermore, in order to avoid depression of the handle portion resulting from a holding force, the handle portion is made having hardness above 30 HRC.
1. A wrench comprising: a head portion, a handle portion, and a neck portion between the head portion and the handle portion, with the handle portion being hollow and including a front portion contiguous to the neck portion, a rear portion adapted to be gripped by a user and a necking portion between the front and rear portions, with the front portion having a wall thickness greater than that of the rear portion, and with the necking portion having a wall thickness greater than that of the rear portion and smaller than that of the front portion; wherein the front portion, the necking portion and the rear portion are integrally formed as a single and inseparable component of a same material, with the necking portion including a small gradient section having a rear end contiguous to the rear portion and a front end, with the necking portion further including a larger gradient section having a rear end contiguous to the front end of the small gradient section and a front end contiguous to the front portion of the handle portion, with the small gradient section including an outer periphery having a first tapering gradient from a rear end thereof to a front end thereof, with the larger gradient section including an outer periphery having a second tapering gradient from a rear end thereof to a front end thereof, with the second tapering gradient being greater than the first tapering gradient.
2. The wrench as claimed in claim 1 , with the small gradient section having a wall thickness greater than that of the rear portion, with the larger gradient section having a wall thickness greater than that of the small gradient section and smaller than that of the front portion.
3. The wrench as claimed in claim 2 , with the small gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
4. The wrench as claimed in claim 3 , with the larger gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
5. The wrench as claimed in claim 1 , with the small gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
6. The wrench as claimed in claim 5 , with the larger gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
7. The wrench as claimed in claim 1 , with the larger gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
8. The wrench as claimed in claim 2 , with the larger gradient section having increased wall thickness from the rear end thereof toward the front end thereof.
9. The wrench as claimed in claim 1 , further including, in combination: an outer cover mounted around the rear portion of the handle portion.
10. The wrench as claimed in claim 1 , with the neck portion and handle portion being integrally formed as the single and inseparable component by a frictional welding process.
11. The wrench as claimed in claim 1 , with the neck portion including a groove in an end face thereof and in communication with an interior of the hollow handle portion.
12. The wrench as claimed in claim 1 , with the necking portion having an outer diameter smaller than that of the rear portion, and with the front portion having an outer diameter smaller than that of the necking portion.
13. The wrench as claimed in claim 1 , with the small gradient section having an outer diameter smaller than that of the rear portion, with the larger gradient section having an outer diameter smaller than that of the small gradient section, and with the front portion having an outer diameter smaller than that of the larger gradient section.
14. The wrench as claimed in claim 2 , with the small gradient section having an outer diameter smaller than that of the rear portion, with the larger gradient section having an outer diameter smaller than that of the small gradient section, and with the front portion having an outer diameter smaller than that of the larger gradient section.
15. The wrench as claimed in claim 1 , with the rear portion of the handle portion including an open rear end defining a rear end opening; wherein the front portion, the necking portion, the rear portion and the open rear end of the handle portion are integrally formed as the single and inseparable component of the same material.
16. The wrench as claimed in claim 15 , with the open rear end of the handle portion having a diameter corresponding to an inner diameter of the handle portion.
17. The wrench as claimed in claim 15 , further including, in combination: a cap mounted to and covering the open rear end.
18. The wrench as claimed in claim 15 , with the neck portion including a groove in an end face thereof and in communication with an interior of the hollow handle portion.
19. The wrench as claimed in claim 18 , with the handle portion having hardness greater than 30 Rockwell C Hardness to strengthen rigidness of the open rear end.
20. The wrench as claimed in claim 15 , with the handle portion having hardness greater than 30 Rockwell C Hardness to strengthen rigidness of the open rear end.