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US-20260124719-A1 - Ratchet Wrench

US20260124719A1US 20260124719 A1US20260124719 A1US 20260124719A1US-20260124719-A1

Abstract

A ratchet wrench includes a wrench body, a ratchet wheel, a pawl member, an elastic member, and a restriction member. The wrench body has a first receiving recess and a second receiving recess. The ratchet wheel is rotatably mounted in the first receiving recess and has a ratchet portion and a mounting portion. The pawl member rests on a side of the second receiving recess and has multiple engaging teeth, a first protruding block, a first face, a second face, and a third face. The engaging teeth engage the ratchet portion. The restriction member has a fourth face, a fifth face, and a receiving chamber. The first protruding block and the elastic member are received in the receiving chamber. The elastic member is elastically biased between the pawl member and a wall of the receiving chamber.

Inventors

  • Chien-Ying Lee

Assignees

  • Chien-Ying Lee

Dates

Publication Date
20260507
Application Date
20241106

Claims (3)

  1. 1 . A ratchet wrench comprising: a wrench body, a ratchet wheel, a pawl member, an elastic member, a restriction member, and a snap ring; wherein: the wrench body has an end provided with a first receiving recess having a circular shape; the first receiving recess has a bottom provided with an abutting edge; the wrench body is provided with a second receiving recess beside the first receiving recess; the second receiving recess is connected to the first receiving recess; the second receiving recess has a diameter less than that of the first receiving recess; the second receiving recess has a center disposed in the first receiving recess; the second receiving recess has a closed top and a closed bottom; the second receiving recess is provided with a first peripheral face having an arcuate shape; the first receiving recess is provided with a first snap ring groove having an annular shape; the first snap ring groove is close to an opening of the first receiving recess; the ratchet wheel is rotatably mounted in the first receiving recess and rests on the abutting edge; the ratchet wheel has a periphery provided with a ratchet portion having multiple teeth arranged annularly; the ratchet wheel is provided with a mounting portion; the ratchet wheel is provided with a second snap ring groove; the second snap ring groove aligns with the first snap ring groove; the pawl member is received in the second receiving recess and rests on a side of the second receiving recess; the pawl member has a first side provided with multiple engaging teeth engaging the ratchet portion; the pawl member has a periphery provided with a first protruding block and a second protruding block; the first protruding block is provided with a first face directed toward the ratchet wheel; the second protruding block is located beside the first protruding block; the second protruding block has a cylindrical shape; the pawl member has a second side provided with a second face and a third face; the second face rests on the first peripheral face; the second face has an arcuate shape; the second face is distant from the second protruding block; the third face has an arcuate shape or planar shape; the elastic member is received in the second receiving recess and elastically presses the pawl member, so that the engaging teeth meshes with the ratchet portion; the elastic member is limited by the first protruding block and is not detached from the second receiving recess; the elastic member has an end mounted on the second protruding block; the restriction member is an arcuate block; the restriction member is made of soft material; the restriction member is slightly elastic; the restriction member is formed by plastic injection molding; the restriction member has a first side provided with a fourth face directed toward the ratchet wheel; the restriction member has a second side provided with a fifth face abutting the first peripheral face; the restriction member has a periphery provided with a receiving chamber having a closed top and a closed bottom; the first protruding block and the elastic member are received in the receiving chamber; the elastic member is elastically biased between the pawl member and a wall of the receiving chamber; the second protruding block is received in the receiving chamber; the first face is spaced from the ratchet wheel; the first face has a planar shape or an arcuate shape; when the first face is a curved face, the first face has a diameter more than that of the first receiving recess, or the first face and multiple tooth valleys of the engaging teeth are connected to form a curved line; the fourth face is spaced from the ratchet wheel; the fourth face has a planar shape or an arcuate shape; when the fourth face is a curved face, the fourth face has a diameter equal to that of the first face, or the fourth face has a diameter more than that of the first face; the snap ring has a C-shaped profile; the snap ring is slightly elastic; and the snap ring is received in the first snap ring groove and the second snap ring groove, so that the ratchet wheel is retained in the first receiving recess.
  2. 2 . The ratchet wrench as claimed in claim 1 , wherein the elastic member is a spring.
  3. 3 . The ratchet wrench as claimed in claim 1 , wherein the mounting portion is a polygonal hole, or the mounting portion is a protruding square head, or the mounting portion may have various structures for mounting another tool.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a hand operated tool and, more particularly, to a ratchet wrench. Description of the Related Art A conventional ratchet wrench was disclosed in the U.S. Pat. No. 8,272,297, and comprises a handle 10, a detent 20, and a socket 30. The detent 20 includes an arcuate block 21, a spring 22, and a movable pawl 23. The arcuate block 21 is provided with a wing plate 211 and a cylindrical hole 212. The movable pawl 23 is provided with a pin 231. However, the conventional ratchet wrench has the following disadvantages. 1. The arcuate block 21, the spring 22, and the movable pawl 23 are connected serially. The spring 22 is connected between the arcuate block 21 and the movable pawl 23. The spring 22 is a soft structure so that the arcuate block 21, the spring 22, and the movable pawl 23 have a soft connection. The movable pawl 23 has a first side abutting the wing plate 211 of the arcuate block 21 and a second side distant from the wing plate 211 of the arcuate block 21. The user's hand cannot hold the arcuate block 21, the spring 22, and the movable pawl 23 simultaneously, so that the arcuate block 21 or the movable pawl 23 easily slip from the user's hand. Thus, the arcuate block 21, the spring 22, and the movable pawl 23 are not assembled easily.2. The spring 22 is mounted between the cylindrical hole 212 and the pin 231. In assembly, when the operator wishes to assemble the spring 22, the first end of the spring 22 is inserted into the cylindrical hole 212 by the operator's one hand, and the first end of the spring 22 is mounted on the pin 231 by the operator's other hand, so that the conventional ratchet wrench is not assembled conveniently.3. The arcuate block 21 is provided with the cylindrical hole 212, and the movable pawl 23 is provided with the pin 231, thereby increasing the working cost of the conventional ratchet wrench.4. The arcuate block 21 is formed with the wing plate 211 by metal injection molding. The wing plate 211 is a thin sheet plate and is not formed easily so that the upper and lower dies of the arcuate block 21 are made thin to fit the wing plate 211. Thus, the upper and lower dies of the arcuate block 21 are not made easily, thereby increasing the cost of fabrication. BRIEF SUMMARY OF THE INVENTION The primary objective of the present invention is to provide a ratchet wrench whose parts are assembled easily and conveniently. In accordance with the present invention, there is provided a ratchet wrench comprising a wrench body, a ratchet wheel, a pawl member, an elastic member, a restriction member, and a snap ring. The wrench body is provided with a first receiving recess, a second receiving recess, and a first peripheral face. The ratchet wheel is rotatably mounted in the first receiving recess and is provided with a ratchet portion and a mounting portion. The pawl member is received in the second receiving recess and rests on a side of the second receiving recess. The pawl member is provided with multiple engaging teeth, a first protruding block, a second protruding block, a first face, a second face, and a third face. The elastic member is received in the second receiving recess and elastically presses the pawl member, so that the engaging teeth meshes with the ratchet portion. The restriction member is provided with a fourth face, a fifth face, and a receiving chamber. The receiving chamber has a closed top and a closed bottom. The first protruding block and the elastic member are received in the receiving chamber. The elastic member is elastically biased between the pawl member and a wall of the receiving chamber. According to the primary advantages of the present invention, the pawl member is provided with the first protruding block assembled in the receiving chamber of the restriction member, so that the pawl member and the restriction member are connected. The pawl member, the elastic member, and the restriction member are assembled previously and are then mounted in the wrench body. Thus, when the user's hand holds the pawl member, the elastic member, and the restriction member, the pawl member and the restriction member will not be detached from each other during assembly, so that the pawl member, the elastic member, and the restriction member are assembled in the second receiving recess easily. According to another advantage of the present invention, the pawl member and the restriction member are connected, the pawl member and the elastic member are connected, and the elastic member and the restriction member are connected, so that the pawl member, the elastic member, and the restriction member are interconnected steadily. Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) FIG. 1 is an exploded perspective v