Ratchet Spanner

A ratchet spanner of the has a spanner body, a stepped insert member, a vertical cylindrical ratchet wheel, a spring-biased pawl assembly, and a control component. The spanner body has a head portion and a handle, which has an end connected fixedly to the head portion. The head portion has a peripheral wall with a top end and a bottom end, a top flange that extends integrally and inside from the top end of the peripheral wall, and a bottom flange that extends integrally and inside from the bottom end of the peripheral wall.

The top flange defines a top opening therein, and has a curving and slotted inner peripheral surface with an open-ended slot that extends circumferentially therealong. The bottom flange has a circular inner peripheral surface, which is made with an inward flange that extends integrally, radially and inside from a bottom end of the circular inner marginal surface and that outlines a bottom opening therein. The insert member is inserted into the head portion of the spanner body between the top and bottom flanges. The insert member has a lower portion with a top surface, a upper portion that extends integrally and upwardly from the top surface of the lower portion, and a curved shoulder defined between the upper and lower portions. The upper portion of the insert member has a curved side surface, which is made with an open-ended slot that extends circumferentially therealong and that cooperates with the open-ended slot in the head portion to form an annular slot unit. The upper portion of the insert member extends into the top opening in the head portion of the ratchet spanners body. The curved shoulder of the insert member abuts against the top flange of the head portion of the spanner body for forestalling upward removal of the insert member from the head portion.

The lower portion of the insert member has a side surface with two chamber units and abuts against the bottom flange for forestalling downward removal of the insert member from the head portion of the spanner body. The ratchet wheel is disposed rotatably within the head portion of the spanner body. The ratchet wheel has a diameter-reduced bottom end that extends into the bottom opening in the head portion of the spanner body and that defines a circular shoulder, a toothed portion with a plurality of ratchet teeth, and a top end portion that's formed with an annular groove. The circular shoulder of the ratchet wheel abuts against the inward flange of the head portion of the spanner body for forestalling downward removal of the ratchet wheel from the head portion of the spanner body. A C-shaped maintaining ring is disposed in the head portion of the spanner body in such a way that the ring engages the annular groove in the ratchet wheel, the open-ended slot in the head portion and the open-ended slot in the insert member for preventing removal of the ratchet wheel and the insert member from the head portion of the spanner body. The pawl assembly includes a first pawl unit and a second pawl unit, which are received respectively within the chamber units in the insert member and which are biased by a spring action to engage the toothed portion of the ratchet wheel. Engagement between the toothed portion of the ratchet wheel and the 1st pawl unit prevents rotation of the ratchet wheel within the head portion of the spanner body in a first direction. Engagement between the toothed portion of the ratchet wheel and the 2nd pawl unit prevents revolution of the ratchet wheel within the head portion of the spanner body in a second direction that is opposite to the 1st direction. The control part is mounted operably on the insert member such that the control part presses selectively against one of the first and 2nd pawl units against the spring action, thereby allowing rotation of the ratchet wheel in the head portion of the spanner body in a selected one of the first and 2nd directions.

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The contributor to this passage is an engineer of a firm engaging in ratchet spanners production and related handyman tools manufacturing.

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