SU1241532A1 - Contact unit - Google Patents

Abstract

- The invention relates to devices for connecting printed circuit boards with contact fug pitch to the test equipment. / pads 1.25 mm or less. The purpose of the retention is to reduce the outer diameter of the node and reduce its electrical resistance while maintaining the magnitude of the working stroke and contact force. With the help of a clamp 11, a force P is applied, and the pads 8 are in contact with the contacts 1, the latter settle the spring 6, increasing the contact force. The spring 6 is made of oval or rectangular wire with rounded section edges. In this case, the major axis of the wire section is parallel to the axis of the spring. 2 Il. o (l

Description

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The invention relates to electrical engineering, in particular, to devices for connecting printed contact boards with a pitch of contact pads of 1.25 mm or less to test equipment.

The purpose of the invention is to reduce the outer diameter of the assembly and reduce its electrical resistance while maintaining the magnitude of the working stroke and contact force.

Figure 1 shows the contact node, a longitudinal axial section; 2, the same, second embodiment,

The assembly consists of the upper 1 and lower 2 working contacts installed in the tubular body 3, made with narrowing 4 and -5, which allow the contacts 1 and 2 to move freely along the axis of the body, but exclude their loss. installed between these pins with axial tension. The spring 6 vg is made of oval or rectangular wire with rounded section edges. The contact assemblies S assembly are installed in the stepped holes of the housing 7 with the possibility of interaction with the contact pads 8 of the printed circuit board 9. Basing of the tested board 9 relative to contacts 1 is provided by catchers 10, and pressing the plate to the contacts - clamps 11,

In the second variant, contacts 1 and 2 as well as spring 6 are installed directly in the holes of the dielectric housing.

Contact node works as follows,.

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Under the control, the board 9 is installed above the contacts 1 and with the help of catchers 10, the coordinates of the printed areas 8 are aligned with the corresponding contacts 1. Then a force P is applied to the board 9 using the clamp 11, and the platform 8 contacts with the contacts 1, Upon further lowering of the clamp and the states, contact 1 sets the spring 6 apart, increasing the contact force from the initial P, | to the final P, Due to the tension of the spring 6, sufficient for the electrical connection, the magnitude of the contact force is reached y; at the very beginning of the movement of the contact 1, After these operations, an electrical check of the printed circuit board is performed.

Claims (1)

Invention Formula The contact unit, mainly for connecting 1 to the test equipment of printed circuit boards, contains movable and fixed contacts installed in the holes of the guide parts and interconnected with a dyndric spring: compression bar, about a liter. and h and y and so that, in order to reduce the outer diameter of the node and reduce its electrical resistance. while maintaining the size of the working code and the contacting force, the compression spring is made of an oval or rectangular wire with rounded section edges, with the major axis of the steam wire section; 1in the spring axis. Editor T. Parfenova Order 3617/59 Circulation 765 VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proektna St., 4 FIG. 2 Tehred N.Vonkalo Proofreader M.Maksimishinets ,,,, ee-, - -, -..- - - - - ------ ™ - Subscription Circulation 765