Retractable open end wrench
AssigneeEasco Hand Tools, Inc.
InventorHsien-Chung Tuan Mu
Life of this patent
Estimating the term…
Abstract
A retractable open-end wrench has a handle defining a web at one end thereof. A stationary jaw projects from a first side of the web, and a first channel is formed at a second side of the web opposite the first side, the first channel being defined by a first arc. A moveable jaw is received by the first channel and moves linearly through the first channel, wherein the jaws form an open end therebetween. A second channel formed in the movable jaw is defined by a second arc, wherein a length of the first arc is greater than a length of the second arc. Moreover, a first radius of the first arc is smaller than a second radius of the second arc, and the first channel and the second channel form a receiving hole.
Claims27
A retractable open-end wrench, comprising:
- a. a web formed with a lower channel having a major arc cross-section containing an arc exceeding a semi-circle;
- b. a stationary jaw projecting from a side of said web,
- c. a movable jaw in operative engagement with said lower channel and forming an open end of a predetermined gap with said stationary jaw, said moveable jaw having,
- (i) an upper channel proximate said web, said upper channel having a minor arc cross-section containing an arc beneath a semi-circle, said minor arc having a radius slightly greater than a radius of said major arc, said upper channel and said lower channel jointly constructing a receiving hole,
- (ii) a post projecting from said movable jaw at a location proximate said upper channel, said post having a cross-section corresponding to said cross-section of said lower channel to allow linear movement along said lower channel, and
- d. a spring received in said receiving hole, said spring subjecting said moveable jaw post to normally urge against said web and allowing linear movement of said movable jaw with respect to said web to thereby increase said predetermined gap.
A retractable open-end wrench comprising:
- a. a web;
- b. a stationary jaw projecting from a side of said web;
- c. a movable jaw provided at another side of said web and forming a gap between said stationary jaw and said moveable jaw;
- d. a first channel formed in said web adjacent said moveable jaw, said first channel defined by a first arc having a cross-section exceeding a semi-circle;
- e. a second channel formed in said movable jaw adjacent said first channel, said second channel defined by a second arc having a cross-section of less than a semi-circle, said second channel having a first radius slightly greater than a second radius of said first channel, wherein said first channel and said second channel jointly form a receiving hole;
- f. a post having a cross-section corresponding to said cross-section of said first channel to allow linear movement of said post within said first channel, said post being formed proximate said second channel;
- and
- g. a spring received in said receiving hole adjacent said post so that said spring biases said post between
- a first position wherein said gap is sized to apply force to a fastener in a first direction, and
- a second position wherein said gap is sized so that said wrench ratchets about the fastener in a second direction.
A retractable open-end wrench comprising:
- a. a handle defining a web at one end thereof having,
- (i) a stationary jaw projecting from a first side of said web, and
- (ii) a first channel formed at a second side of said web opposite said first side, said first channel defined by a first arc;
- b. a moveable jaw received by said first channel so that said moveable jaw traverses said first channel, wherein said jaws form a gap therebetween;
- and
- c. a second channel formed in said movable jaw proximate said first channel and defined by a second arc, wherein
- a length of said second arc is smaller than a length of said first arc,
- a first radius of said first arc is smaller than a second radius of said second arc, and
- said first channel and said second channel form a receiving hole.
Dependencies are inferred from the claim text.