Патент USA US3084322код для вставки
April 2, 1963 M. L. CROOKS 3,084,313 TRIMMER CONDENSER Filed April 28, 1961 /5 9 Il' 7 ' ‘a II /8 llllil I‘; 4v 4 23 A!‘ 7 E‘ .l I ,i ‘I . 20 E" 5" 3 2/ /0 / FIG-3. r /Z /7 _ w 2/ z Z FIG. 4 20 ‘22 INVENTOR BY 2 WW“, m United rates Patent free 3,084,313 Patented Apr. 2, 1963 1 2 3,084,313 a precise and accurate control of the force exerted by the spring ?ngers 20 on the collet tending to move the TRIMMER CONDENSER Marcius Lee Crooks, Erie, Pa., assignor to Erie Resistor Corporation, Erie, Pa., a corporation of Pennsylvania Filed Apr. 28, 1961, Ser. No. 106,383 2 tilairns. (Cl. 317—-249) This invention is a trimmer condenser having accurate threaded portion 18 of the collet radially into engagement with the adjusting screw 12. The radial clamping force between the threaded portions 18 on the collet and the adjusting screw takes up backlash and provides sufficient friction to prevent unwanted change in position of the adjusted screw. The desired friction ‘grip on the adjusting screw is easily controlled by the torque exerted at the ly controllable adjusting torque and a high degree of stability in service. 10 screw driver slot 24. In addition to exerting a radial In the drawing, FIG. 1 is a longitudinal section through clamping force on the adjusting screw, the spring ?ngers a trimmer condenser, FIG. 2 is a side view, partly in sec 20 also exert an axial force tending to take up any back-r tion of the collet gripping the adjusting screw, FIG. 3 is lash between the externally threaded section 14 of the an end view of the collet, FIG. 4 is a section through the collet and the internal threads 15 in the mounting bushing. spring which controls the pressure between the collet and 15 Once the desired friction grip on the adjusting screw 12 the threads of the adjusting screw, and FIG. 5 is an end has been set, the collet may be suitably anchored to the view of the spring. mounting bushing, for example by staking. The condenser has a tubular dielectric 1, for example What is claimed as new is: of one of the glasses with a low temperature coef?cient 1. A trimmer condenser having a tubular dielectric of expansion, having at one end a metal electrode coating 20 ?xed at one end to an internally threaded tubular mount 2 and having the opposite end telescoped over a cylin ing bushing, an external electrode on the dielectric, an drical ?ange 3 on a bushing 4. The dielectric is fastened internal electrode, an adjusting screw for moving the in to the bushing 4 by a bead 5 of solder at the junction ternal electrode along the bore of the dielectric, a collet between a metal coating 6 on the dielectric and a radially having one end externally threaded and screwed into the projecting ?ange 7 on the bushing. For mounting pur 25 internally threaded bushing and having spring fingers at poses, the bushing has an externally threaded portion 8 the opposite end internally threaded to cooperate with and a nut 9. Other mounting constructions may be used. the adjusting screw, said ?ngers having external wedge Within the bore of the dielectric is a cup shaped electrode surfaces, spring means surrounding the collet and having member 10 of one of the metals having a low temperature one end ?xed relative to the bushing and the opposite end coefficient of expansion. The bottom wall 11 of the elec 30 engaging the wedge surfaces on the collet to force the trode is ?xed to one end of ‘an adjusting screw 12 for spring ?ngers of the collet inward to grip the adjusting moving the electrode along the bore of the dielectric. The screw, said collet being provided with means by which it parts so far described are or may be of common construc may be ‘screwed into and out of the bushing to adjust tion. the force of the spring on the wedge surfaces on the collet. Surrounding the adjusting screw 12 is a collet 13 having 35 2. A trimmer condenser having a tubular dielectric at one end ‘an externally threaded enlargement 14 screwed ?xed at one end to an internally threaded tubular mount into an internally threaded section 15 in the bushing 8. ing bushing, an external electrode on the dielectric, an Extending toward the opposite end of the collet are 4 internal electrode, an adjusting screw for moving the in spring ?ngers 16 conveniently formed by slots 17. At ternal electrode along the bore of the dielectric, a collet the extreme ends, the ?ngers are provided with inwardly 40 having one end externally threaded and screwed into the extending projections 18, internally threaded to cooperate internally threaded bushing and having spring ?ngers at the opposite end internally threaded to cooperate with ends of the ?ngers 15 have tapered surfaces 19 cooperat the adjusting screw, said ?ngers having external wedge ing with spring ?ngers 20 of an annular spring member surfaces, a tubular spring member surrounding the collet 21. The spring ?ngers 20 are conveniently formed by 45 having one end ?xed relative to the bushing and having spring ?ngers ‘at the opposite end engaging the wedge sur slots 22 extending in from one end of the spring member. with the adjusting screw 12. On the outer surface, the faces on the collet to force the spring ?ngers of the collet The nnslotted end of the spring member 21 is seated on inward to grip the adjusting screw, said collet being pro a shoulder 23 on the mounting bushing 8. The collet has vided with means by which it may be screwed into and a screw driver slot 24 by means of which it may be moved 50 out of the bushing to adjust the force of the spring on the axially relative to the bushing 8 so as to force the tapered wedge surfaces on the collet. surfaces 19 on the collet against complementary surfaces on the spring ?ngers 20 of the spring 21. This provides No references cited.