JPH0614533U - Semi-lock screw with taper type slit and dedicated driver for it - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to provide a half-lock screw with a taper type slit that can be set securely even with a small size and that does not change the adjustment position before and after locking after adjustment and a dedicated driver to use it. . [Structure] In a slotted set screw, a taper type slit 5 is provided so as to be continuous with the slotted portion 6, and is constituted by a taper screw portion 4 formed by the slit and a parallel screw portion 3 at the tip end portion. A frusto-conical cut portion 7 is provided on the head. In addition, a dedicated driver having an integral structure with a frustoconical box outer edge portion 8 that fits into the cut portion 7 and a minus driver tip portion 9 that fits into the slot portion 6 is provided on the central axis. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tuning or resonance adjusting screw used for a coupling element and / or a tuning element for a coupling circuit and / or a tuning circuit, and more particularly to a semi-lock screw having a tapered slit and a dedicated driver used for the same.

[0002]

[Prior art]

The case of a double-tuned circuit will be described as an example. Generally, as the tuning element, a helical coil L ₁ having a preset input / output tap position in order to obtain the best tuning point and coupling degree as shown in FIG. A filter having a structure in which variable capacitors C ₁ and C ₂ are connected between the terminal of L ₂ and ground and a variable shield S which suppresses coupling between L ₁ and L ₂ is provided is used. Then, instead of the variable capacitor C ₁ C ₂ , the distance between the adjusting screws C ₁ and C ₂ and the coils L ₁ and L ₂ shown in FIG. 4 is adjusted so that the best tuning point can be set.

As shown in FIG. 4, the variable shield for adjusting the coupling is formed by coupling the helical coils L ₁ and L ₂ through a shield member S and inserting and removing the shield member. Some fine adjustments are made to obtain the best combined state, and there is also one in which the optimum combined state is obtained by inserting and removing an adjusting screw instead of the shield member.

By the way, as a method of locking the adjusting screw, the one shown in FIG. 5 and the one shown in FIG. 6 have been widely used. In FIG. 5, the case 15 is provided with the fixed nut 16, and the adjusting screw 18 screwed into the nut 16 is put in and out, and when it can be set at an appropriate position, it is screwed to the outer diameter portion of the fixed nut 16. The setting nut 17 is screwed into the taper screw so that the adjusting screw 18 is locked to the case 15 via the fixed nut 16. It should be noted that a configuration is provided in which a number of slits are radially provided in a portion where the fixed nut 16 and the setting nut 17 are screwed together, and the adjusting screw 18 is pressed and locked as the setting nut 17 is screwed. Has become. In FIG. 6, after the adjusting screw 22 that is screwed into the fixed nut 21 provided in the case 20 is put in and taken out at an appropriate position, the setting nut plate 23 is screwed into the adjusting screw 22 and the locking bolt 24 Thus, the setting nut plate 23 is firmly tightened to such an extent that it is bent toward the case 20, and the adjusting screw 22 is fixed.

[0005]

[Problems to be solved by the device]

 In the former case, the conventional locking method described above does not completely fix the adjusting screw though it depends on the taper angle of the taper screw threaded on the outer diameter portion of the fixed nut 16 and the accuracy of the screw. In the latter case, there was a problem such that the adjusting screw had a positional deviation before and after locking, or the tuning was a little misaligned due to vibration or the like. Further, as the operating frequency becomes higher, each element becomes smaller, which makes it difficult to reliably lock the adjusting screw.

The present invention has been proposed in order to solve the above-mentioned problems, and can be reliably set even when the adjusting screw itself is downsized, and the adjusting position before and after the lock after adjustment can be achieved. The purpose is to provide a half-lock screw with a taper type slit that does not change and a special driver used for it.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is configured so that the best tuning or coupling can be set by putting in and out the adjusting screw, and at the same time, it can be accurately locked. That is, in a set screw with a slitting portion, a taper type slit is provided below the slitting portion to form a taper screw portion having an expanding tendency in the screw portion around the slit, and It is a semi-locking screw that has a parallel screw part at the tip part and a frustoconical cut part at the head of the screw.On the other hand, as a dedicated driver for the screw, , A driver having a form corresponding to the cut portion of the screw is combined. In other words, the present invention was devised as a dedicated driver having an outer edge portion of a box having a truncated pyramid shape in cross section and a minus driver tip portion engaging with the slotted portion formed on the central axis of the box.

[0008]

[Action]

 Since the present invention has the above-mentioned configuration, the working end of the minus driver formed at the tip of the above-mentioned special driver is provided in the frustoconical cut portion and the slit portion provided on the head of the half-lock screw. While inserting, fit the outer edge of the frusto-conical box formed inside the tip of the screwdriver and press firmly to the outer peripheral surface of the taper type slit provided in the semi-lock screw, that is, always on the side. The periphery of the taper type slit part that tends to widen toward the inside is narrowed toward the inside, and the same screw outer diameter as the outer diameter of the parallel thread at the tip is maintained. Therefore, the semi-lock screw can be lightly adjusted so that it is in the proper position, and when the adjustment is completed, the special screwdriver can be removed from the screw head. That is, if the box part of the driver is released from the frustoconical cut part, the taper screw part, whose outer diameter is narrowed as described above, tries to expand outward to return to the old position. Therefore, the half-lock screw is accurately locked in its adjusted position.

[0009]

【Example】

 The present invention will be specifically described with reference to the drawings based on embodiments. A member designated by reference numeral 1 in FIG. 1 is an example of a half-lock screw provided with a tapered slit according to the present invention, and a reference numeral 2 is an example of a dedicated driver used for operating the screw 1. In the figure, reference numeral 3 is a parallel thread portion formed under the half lock screw, 4 is a taper thread portion, 5 is a taper slit portion, 6 is a slit portion, and 7 is a truncated cone-shaped cutter. A box portion, 8 is an outer edge portion of the box having a frustoconical cross section formed inside the lower end portion of the driver, and 9 is a tip portion of a minus driver. Incidentally, in the illustrated example, the exclusive driver-2 is an integral structure in which the cylindrical box portion 2b located around the shaft center portion 2a connected to the minus driver is firmly crimped, The present invention is not limited to such a two-member structure, but may be composed of one member as a whole, and the cross-sectional shape of the driver may be any shape such as circular or polygonal.

The configuration of the slot portion 6 in the slotted set screw 1 will be described below. That is, as an example, as shown in the drawing, a slotted portion 6 having a shape suitable for the front end portion of the flathead screwdriver to be bitten in is formed at the upper portion, and a shape extended from the slotted portion is formed at the lower portion thereof. Although the example in which the tapered slit portion 5 is formed in a state having a step is shown, the slit portion 6 and the tapered slit portion 5 do not necessarily have to have the shapes shown in the drawings, and both of them as a whole. A taper type slit shape without steps may be used. The necessary condition is that the outer diameter Φ ₂ of the tapered slit portion 5 and the slit portion 6 is the outer diameter Φ ₁ of the parallel screw 3 located below the tapered slit portion 5 and the slit portion 6, as indicated by the symbols Φ ₁ and Φ _2. This is a point that a spring effect is given so as to be wider than that, in other words, by using the slit portion 5, the outer diameter of the taper screw portion 4 becomes larger than the outer diameter of the parallel neck portion 3 at the tip. In addition, the point is that it always has a tendency to expand toward the side. Needless to say, a frustoconical cut portion 7 is provided on the head of the half-lock screw. Incidentally, as a material, for example, it is preferable to use a phosphor bronze material which is a highly conductive conductive material.

A minus driver tip portion 9 is provided at the center of the tip of the dedicated driver 2, and the outer peripheral portion thereof is fitted to the frustoconical cut portion 7 of the half lock screw 1 as indicated by reference numeral 8. Since the box outer edge portion 8 having the above-described shape, that is, the inner cross section similar to that described above is provided, the box outer edge portion 8 is fitted into the truncated conical cut portion 7 of the half lock screw 1. Then, if this is pressed from above, the taper screw part 4 that was elastically expanded outward as shown in the figure is narrowed inward and has the same outer diameter as the parallel screw part 3, while When the above fitting is released, the taper screw portion 4 returns to the old outer diameter.

In use, with respect to the frustoconical cut portion 7 provided on the head of the half-lock screw 1 and the slot portion 6, a minus driver tip portion 9 formed at the lower end of the dedicated driver 2 is used. It suffices to fit the outer edge portion 8 of the frustoconical box while inserting it and press it firmly. At that time, the outer diameter of the taper screw portion 4 in the half lock screw 1 is fitted inward, and the parallel screw 3 at the tip end Since the screw outer diameter is the same as the screw outer diameter of, the screw can be lightly screwed into or screwed out at an appropriate position of the nut member 10 as shown in FIG. Adjustment is extremely easy. When this adjustment is completed, the dedicated screwdriver is removed to disengage the fitting with the frustoconical cut portion, and the taper screw portion 4 whose outer diameter has been narrowed as described above is moved to the old position. The semi-lock screw 1 is locked by the nut member 10 because the half lock screw 1 tries to expand outward as indicated by the arrow F in order to return to. As described above, the setting or locking of the tuning or coupling by the adjustment is performed without requiring any special operation, and upon completion of the setting operation, the half-lock screw of the present invention returns to the original old position. Due to the elasticity to be set, the screw is automatically locked in the set position, so that the accuracy is increased.

[0013]

[Effect of device]

 By using the half-lock screw of the present invention and its dedicated driver, the following effects are exhibited. In other words, it is possible to accurately lock in the optimum tuning or coupling state set while making an electrical check, and the locking operation is completed by removing the dedicated screwdriver from the half-lock screw after adjustment, which is complicated. The workability is improved because it does not require detailed operations. It also contributes to the miniaturization of this type of device, and has a remarkable effect in that it can be applied to small devices with high operating frequencies.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a half-lock screw provided with a tapered slit of the present invention and a dedicated driver used for the half-lock screw.

FIG. 2 is an explanatory diagram showing a locked state of the half-lock screw shown in FIG.

FIG. 3 is an electric circuit diagram showing a schematic configuration of a tuning element in which the half-lock screw of the present invention is used.

FIG. 4 is a schematic electrical circuit diagram of a coupling element as in FIG.

FIG. 5 is a diagram showing a conventional locking state of an adjusting screw.

FIG. 6 is a sectional view of an adjusting screw mechanism showing another conventional type.

[Explanation of symbols]

 1 Half-lock screw 2 Dedicated driver 3 Parallel screw part 4 Tapered screw part 5 Tapered slit 6 Slotted part 7 Frustro-conical cut part 8 Frustro-conical box outer edge 9 Minus screwdriver tip 10 Nut member

Claims (2)

[Scope of utility model registration request] 1. A set screw with a slotted portion is provided with a taper type slit at least below the slotted portion so that the entire slotted portion including the slit always has a tendency to widen laterally. Without taper thread part,
A semi-lock screw provided with a taper type slit, characterized in that a parallel thread portion is provided at a tip end portion of the taper thread portion, and further a truncated cone-shaped cut portion is provided at a head portion of the screw. 2. A box outer edge portion having a truncated cone inner cross-section corresponding to the cut portion, and a minus driver tip portion engaging with the slot portion are formed on a central axis of the box. And a dedicated driver.