US-20260124721-A1 - POWER RATCHET WRENCH HEAD

US20260124721A1US 20260124721 A1US20260124721 A1US 20260124721A1US-20260124721-A1

Abstract

A power ratchet wrench head has an outer casing, a gear set, a crank set, and a ratchet set. The outer casing has a closed end, an open end, a chamber, and a fixing portion. The gear set is connected to the outer casing and has a fixing sleeve, a gear sleeve, and a planetary gear seat. The fixing sleeve has a front locking portion and a rear locking portion. The front locking portion is formed on the fixing sleeve and is connected to the fixing portion. The rear locking portion is formed on the fixing sleeve and is spaced apart from the front locking portion. The crank set is disposed in the outer casing, is connected to the gear set, and has a crankshaft. The ratchet set is connected to the outer casing and the crank set and has a ratchet yoke, a transmission shaft, and a control knob.

Inventors

HSU HUAN CHIANG

Assignees

HSU HUAN CHIANG

Dates

Publication Date: 20260507
Application Date: 20250613
Priority Date: 20241107

Claims (20)

1 . A power ratchet wrench head comprising: an outer casing having a closed end; an open end; a chamber formed in the outer casing between the closed end and the open end; and a fixing portion formed on an external surface of the outer casing and disposed at the open end; a gear set connected to the outer casing and having a fixing sleeve connected to the outer casing and having a front locking portion formed on an inner surface of the fixing sleeve adjacent to a front end of the fixing sleeve and connected to the fixing portion of the outer casing; and a rear locking portion formed on the inner surface of the fixing sleeve adjacent to a rear end of the fixing sleeve and spaced apart from the front locking portion; a gear sleeve connected to the fixing sleeve and having a threaded portion formed on an external surface of the gear sleeve; and a front end of the gear sleeve connected to the rear locking portion of the fixing sleeve via the threaded portion; and a planetary gear seat disposed in the gear sleeve and engaging with the gear sleeve; a crank set disposed in the outer casing, connected to the gear set, and having a crankshaft having a rear end engaging with the planetary gear seat; and a front end extended into the chamber of the outer casing; and a ratchet set connected to the outer casing and the crank set and having a ratchet yoke swingably disposed in the chamber of the outer casing and abutting against the front end of the crankshaft; a transmission shaft connected to the outer casing and engaging with the ratchet yoke; and a control knob connected to the transmission shaft to rotate the transmission shaft relative to the ratchet yoke.
2 . The power ratchet wrench head as claimed in claim 1 , wherein each one of the front locking portion and the rear locking portion is an inner thread; and spiral directions of the inner threads of the rear locking portion and the front locking portion are opposite to each other.
3 . The power ratchet wrench head as claimed in claim 2 , wherein the crank set has a positioning mount disposed in the chamber via the open end of the outer casing and abutting against the gear sleeve to hold the positioning mount between the outer casing and the gear sleeve.
4 . The power ratchet wrench head as claimed in claim 3 , wherein the outer casing has an assembly recess formed in the outer casing, disposed at the open end of the outer casing, and communicating with the chamber; and the positioning mount has an abutting ring radially formed on and protruded from a rear end of the positioning mount, disposed in the assembly recess of the outer casing, and abutted against the front end of the gear sleeve.
5 . The power ratchet wrench head as claimed in claim 4 , wherein the positioning mount has a connecting ring axially formed on and protruded from a side of the abutting ring facing the gear sleeve, and extended into the gear sleeve.
6 . The power ratchet wrench head as claimed in claim 1 , wherein the outer casing has an assembly hole formed through a top side and a bottom side of the outer casing adjacent to the closed end and communicating with the chamber; and the transmission shaft is connected to the assembly hole of the outer casing.
7 . The power ratchet wrench head as claimed in claim 2 , wherein the outer casing has an assembly hole formed through a top side and a bottom side of the outer casing adjacent to the closed end and communicating with the chamber; and the transmission shaft is connected to the assembly hole of the outer casing.
8 . The power ratchet wrench head as claimed in claim 3 , wherein the outer casing has an assembly hole formed through a top side and a bottom side of the outer casing adjacent to the closed end and communicating with the chamber; and the transmission shaft is connected to the assembly hole of the outer casing.
9 . The power ratchet wrench head as claimed in claim 4 , wherein the outer casing has an assembly hole formed through a top side and a bottom side of the outer casing adjacent to the closed end and communicating with the chamber; and the transmission shaft is connected to the assembly hole of the outer casing.
10 . The power ratchet wrench head as claimed in claim 5 , wherein the outer casing has an assembly hole formed through a top side and a bottom side of the outer casing adjacent to the closed end and communicating with the chamber; and the transmission shaft is connected to the assembly hole of the outer casing.
11 . The power ratchet wrench head as claimed in claim 6 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
12 . The power ratchet wrench head as claimed in claim 7 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
13 . The power ratchet wrench head as claimed in claim 8 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
14 . The power ratchet wrench head as claimed in claim 9 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
15 . The power ratchet wrench head as claimed in claim 10 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
16 . The power ratchet wrench head as claimed in claim 1 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
17 . The power ratchet wrench head as claimed in claim 2 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
18 . The power ratchet wrench head as claimed in claim 3 , wherein the gear sleeve has multiple engaging teeth formed on an inner surface of the gear sleeve; and the planetary gear seat has multiple planetary gears disposed on a side of the planetary gear seat and engaging with the engaging teeth of the gear sleeve.
19 . The power ratchet wrench head as claimed in claim 1 , wherein the crank set has a positioning mount disposed in the chamber via the open end of the outer casing and abutting against the gear sleeve to hold the positioning mount between the outer casing and the gear sleeve.
20 . The power ratchet wrench head as claimed in claim 19 , wherein the outer casing has an assembly recess formed in the outer casing, disposed at the open end of the outer casing, and communicating with the chamber; and the positioning mount has an abutting ring radially formed on and protruded from a rear end of the positioning mount, disposed in the assembly recess of the outer casing, and abutted against the front end of the gear sleeve; and a connecting ring axially formed on and protruded from a side of the abutting ring facing the gear sleeve, and extended into the gear sleeve.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool, and more particularly to a power ratchet wrench head that can improve structural strength, can improve transmission stability, and can extend the service life. 2. Description of Related Art A conventional power ratchet wrench is driven by eccentric swinging, so as to rotate components such as bolts or nuts in a forward or reverse direction to fasten or loosen the components. The conventional power ratchet wrench has a body, a driving device, and a wrench head. The body is for a user to hold and is connected to a power source. The driving device is connected to the body and has a cylinder and a rotor. The power source is flowed into the driving device via the body to drive the rotor to rotate relative to the cylinder. The wrench head is connected to the driving device and has a gear set, a crank set, and a ratchet set. The gear set is connected to the driving device to enhance the torque. The crank set is connected to the gear set to perform yaw rotation. The ratchet set is connected to the crank set to rotate the component in a forward or reverse direction to fasten or loosen. Although the torque of the conventional power ratchet wrench can be enhanced by eccentric swinging and the transmission of the gear set, in order to facilitate the assembly of the ratchet set, the wrench head of the conventional power ratchet wrench is configured with an open outer casing having an upper clamping panel and a lower clamping panel, and the ratchet set is clamped by the two clamping panels. However, after the conventional power ratchet wrench is used for a long time, the two clamping panels are easily twisted and deformed due to the yaw vibration between the crank set and the ratchet set due to the insufficient structural strength of the two clamping panels. The ratchet set may be relatively offset relative to the crank set, thereby affecting the transmission of the crank set to the ratchet set and generating noise, and the offset of the crank set and the ratchet set will also increase the shaking, thereby causing the two clamping panels to be damaged or broken. In addition, for mitigating the problem caused by the insufficient structural strength of the two clamping panels of the above-mentioned outer casing, currently, the outer casing of the crank set is set to a closed sleeve structure type to improve the structural strength of the outer casing. Though the closed sleeve structure type of the outer casing can increase the structural strength of the outer casing and avoid damage or breakage caused by insufficient structural strength, the outer casing of the sleeve structure type is provided with an annular flange at the rear end, and is connected to the body by a connecting ring engaged with the annular flange. Since the outer casing and the body are positioned and connected only by the engagement of the annular flange and the connecting ring, the vibration generated during the use of the conventional power ratchet wrench can easily cause the connecting ring and the outer casing to shake, causing the connecting ring and the outer casing to loosen, resulting in an offset between the ratchet set and the gear set disposed in the outer casing, which will still affect the transmission of the crank set to the ratchet set and generate noise. The offset between the crank set and the ratchet set will increase the shaking, and further damage the casing. The damaged conventional power ratchet wrench cannot be used anymore, which will increase the cost of use and affect its service life. In summary, the conventional power ratchet wrench needs to be improved. To overcome the shortcomings, the present invention tends to provide a power ratchet wrench head to mitigate the aforementioned problems. SUMMARY OF THE INVENTION The main objective of the invention is to provide a power ratchet wrench head that may provide a buffering effect and extend the service life. A power ratchet wrench head in accordance with the present invention has an outer casing, a gear set, a crank set, and a ratchet set. The outer casing has a closed end, an open end, a chamber, and a fixing portion. The gear set is connected to the outer casing and has a fixing sleeve, a gear sleeve, and a planetary gear seat. The fixing sleeve has a front locking portion and a rear locking portion. The front locking portion is formed on the fixing sleeve adjacent to a front end of the fixing sleeve and is connected to the fixing portion. The rear locking portion is formed on the fixing sleeve adjacent to a rear end of the fixing sleeve and is spaced apart from the front locking portion. The gear sleeve has a threaded portion. The crank set is disposed in the outer casing, is connected to the gear set, and has a crankshaft. The ratchet set is connected to the outer casing and the crank set and has a ratchet yoke, a transmission shaft, and a control knob. Other objects, advantage