| 摘要 |
A speed-selectable hand tool includes a handle, a cage member fixed to the handle, a shaft member extending into the cage member, a sleeve member sleeved on the shaft member and extending into the cage member, a plurality of transmission members each meshing with the shaft member and the sleeve member, a plurality of pawls mounted to the cage, a knob surrounding the pawls, and an outer casing mounted with the transmission members. The speed-selectable hand tool is operable to serve as a non-ratcheting hand tool or a ratcheting hand tool by rotating the knob relative to the cage member to actuate the pawls. The rotational speed of the shaft member relative to the handle is selectable through operation of the outer casing. |
| 主权项 |
1. A speed-selectable hand tool comprising:
a handle; a cage member having a cage section and a connecting section, said cage section having a front portion, a rear portion that is spaced apart from said front portion along an axis, an intermediate portion that is connected between said front and rear portions, a retaining space that is formed in said front portion and said intermediate portion and that extends along the axis, four through grooves each of which is formed in said intermediate portion and extends in the radial direction of the axis, and a first shaft hole portion that is formed in said rear portion, said connecting section extending along the axis from one end of said rear portion distal from said front portion, being connected fixedly to said handle, and being formed with a second shaft hole portion that is in spatial communication with said first shaft hole portion; a shaft member extending along the axis, being rotatable relative to said cage member, and having a first ratchet wheel section that is retained in said retaining space, a rod section that extends through said first and second shaft hole portions, and a first gear section that is located at a front side of said first ratchet wheel section opposite to said rod section; an overdrive unit including a sleeve member that is sleeved rotatably on said shaft member, that is located at the front side of said first ratchet wheel section opposite to said rod section, and that has a second ratchet wheel section retained in said retaining space and proximate to said first ratchet wheel section, and a second gear section distal from said first ratchet wheel section, two spaced-apart and substantially polygonal support frames that are mounted rotatably and respectively on said sleeve member and said shaft member, and a plurality of transmission members each of which is mounted rotatably between said support frames, and has a small gear section meshing with said second gear section of said sleeve member, and a large gear section meshing with said first gear section of said shaft member; a pawl unit including a mounting plate that is mounted in said front portion of said cage section of said cage member, first and second shaft pawls that are partially retained in said retaining space, and first and second sleeve pawls that are partially retained in said retaining space, said first shaft pawl having a main body that is mounted pivotally between said mounting plate and said rear portion of said cage section of said cage member, an engaging section that extends from said main body, and a driven section that extends from said main body and out of said cage section of said cage member through a corresponding one of said through grooves, and being operable to switch between an enabled state where said engaging section of said first shaft pawl engages separably said first ratchet wheel section of said shaft member for preventing said shaft member from rotating relative to said cage member in a first rotational direction, and a disabled state where said engaging section of said first shaft pawl is separated from said first ratchet wheel section, said second shaft pawl having a main body that is mounted pivotally between said mounting plate and said rear portion of said cage section of said cage member, an engaging section that extends from said main body, and a driven section that extends from said main body and out of said cage section of said cage member through a corresponding one of said through grooves, and being operable to switch between an enabled state where said engaging section of said second shaft pawl engages separably said first ratchet wheel section of said shaft member for preventing said shaft member from rotating relative to said cage member in a second rotational direction opposite to the first rotational direction, and a disabled state where said engaging section of said second shaft pawl is separated from said first ratchet wheel section, said first sleeve pawl having a main body that is mounted pivotally between said mounting plate and said rear portion of said cage section of said cage member, an engaging section that extends from said main body, and a driven section that extends from said main body and out of said cage section of said cage member through a corresponding one of said through grooves, and being operable to switch between an enabled state where said engaging section of said first sleeve pawl engages separably said second ratchet wheel section of said sleeve member for preventing said sleeve member from rotating relative to said cage member in the first rotational direction, and a disabled state where said engaging section of said first sleeve pawl is separated from said second ratchet wheel section, said second sleeve pawl having a main body that is mounted pivotally between said mounting plate and said rear portion of said cage section of said cage member, an engaging section that extends from said main body, and a driven section that extends from said main body and out of said cage section of said cage member through a corresponding one of said through grooves, and being operable to switch between an enabled state where said engaging section of said second sleeve pawl engages separably said second ratchet wheel section of said sleeve member for preventing said sleeve member from rotating relative to said cage member in the second rotational direction, and a disabled state where said engaging section of said second sleeve pawl is separated from said second ratchet wheel section; a knob mounted rotatably around said cage section of said cage member and said pawl unit, and having a surrounding wall that surrounds said pawl unit, a base wall that is dispose at an end of said surrounding wall distal from said handle, two first driving protrusions that are formed on an inner surface of said surrounding wall for respectively driving said driven sections of said first and second shaft pawls so as to switch the states of said first and second shaft pawls, and two second driving protrusions that are formed on said inner surface of said surrounding wall for respectively driving said driven sections of said first and second sleeve pawls so as to switch the states of said first and second sleeve pawls, said first driving protrusions and said second driving protrusions being angularly spaced apart from each other about the axis; an outer casing formed with a substantially polygonal hole for retaining co-rotatably said support frames therein; and a head unit connected to and driven by said shaft member. |
