Home | Computer | Computer Engineering
A ratchet spanner of the contains a spanner body, a stepped insert member, a vertical cylindrical ratchet wheel, a spring-biased pawl assembly, and a control part. The spanner body has a head portion and a handle, that 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 marginal wall, and a bottom flange that extends integrally and inside from the bottom end of the marginal 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 formed with an inward flange that extends integrally, radially and inwardly from a bottom end of the circular inner peripheral 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 higher portion that extends integrally and upwardly from the top surface of the lower portion, and a curving shoulder defined between the upper and lower portions. The upper portion of the insert member has a curving side surface, which is formed 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 preventing 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 preventing 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 preventing downward removal of the ratchet wheel from the head portion of the spanner body. A C-shaped keeping ring is disposed in the head portion of the spanner body in such a manner 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 incorporates a first pawl unit and a second pawl unit, which are received respectively in 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 revolution of the ratchet wheel in the head portion of the spanner body in a first direction. Engagement between the toothed portion of the ratchet wheel and the second pawl unit impedes revolution of the ratchet wheel within the head portion of the spanner body in a second direction that's opposite to the first direction. The control element is mounted operably on the insert member such that the control component presses selectively against one of the first and second pawl units against the spring action, thereby allowing revolution of the ratchet wheel within the head portion of the spanner body in a selected one of the first and second directions.
Article Source: http://www.gambling-articles.org
The author to this passage is a design engineer of a firm offering ratchet spanners production and related hand tools manufacturing.
Please Rate this Article
5 out of 54 out of 53 out of 52 out of 51 out of 5
Not yet Rated
