JPS6130241Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to various trimmers such as resistors and capacitors.

In recent years, trimmers have become more precise and more compact, and are often attached to printed circuit boards, etc. In this case, it is necessary to operate the variable shaft of the trimmer from outside the case. Therefore, an adjustment pin that engages with this variable shaft is attached to the case.
The diameter of the variable shaft is approximately 1 to 3 mm, making alignment, machining, etc. extremely difficult. Therefore, in order to eliminate this drawback, the trimmer shown below has been conventionally implemented. The trimmer a shown in Fig. 1 has a large diameter variable shaft c protruding from the main body b, and a wide engagement groove d is formed in the end face of the variable shaft c, and the trimmer a is engaged with the engagement groove d. It is constructed by attaching an adjustment pin e to the case f, and allows the variable shaft c to be operated externally.
However, in this trimmer a, only the variable shaft c had to be specially machined, and the work was complicated.

In addition, in the trimmer g shown in FIG. 2, an engagement pin i is brazed orthogonally to the variable shaft h, and a bifurcated contact pin j that engages with the engagement pin i is connected to an adjustment pin k.
It is constructed in conjunction with.

Furthermore, the trimmer l shown in FIG.
Two elastic disks m, m are overlapped and welded to the disk m, and a contact disk n, which is in clamping contact between the disks m, m, is fixed to an adjustment pin k.

However, in any of the above trimmers g and l,
Although the variable shaft h itself does not require any special processing, it requires brazing the engagement pin i and welding the elastic disk m, which has the disadvantage that assembly work is time-consuming.

This idea was made in view of this point, and by simply inserting the connecting ring into the variable shaft, the variable shaft can be adjusted externally, thereby eliminating the need for machining the variable shaft and reducing assembly work. We provide a trimmer that is simplified.

That is, in this invention, the connecting ring includes a ring main body having a variable shaft insertion hole, a first engagement piece that engages with the variable shaft, and a pair of second engagement pieces that engage with the variable shaft with pressure.
It is composed of an engaging piece and a third engaging piece that engages with an adjustment pin attached to the case, and by inserting this connecting ring into the variable shaft, the first engaging piece is connected to the variable shaft. The feature is that the third engagement piece engages with the adjustment pin.

Hereinafter, this invention will be explained in detail based on the embodiments shown in the drawings.

As shown in FIGS. 4 and 5, the trimmer 1 is a variable height mechanism, and is composed of a main body 2, a variable shaft 3, a connecting ring 4, and an adjustment pin 5.

The main body 2 is arranged inside a case 6,
Although not shown, it is fixed to a printed circuit board or the like.

The variable shaft 3 has a diameter of about 1 to 3 mm, and its tip protrudes from the main body 2, and a U-shaped groove 3a is formed in the end surface in the orthogonal direction extending from both sides.

The connection ring 4 is attached to the variable shaft 3, and has three types of engagement pieces 4 on the ring body 4a.
b, 4c, and 4d are extended. The ring main body 4a has an insertion hole 4e formed in the center thereof through which the variable shaft 3 is inserted, and is formed in a donut shape. The above-mentioned joint 1 engaging piece 4b is connected to the above-mentioned insertion hole 4.
A pair of rising portions 4f and 4f extend from the ring body 4a at the edge.
The horizontal portion 4g is bent inward at right angles from the upper end of the shaft, and this horizontal portion 4g faces the U-shaped groove 3a and engages with the variable shaft 3. In addition, the second
The engagement piece 4c is attached to the ring body 4 at the edge of the insertion hole 4e.
A pair of engaging pieces are provided facing each other from a, and are positioned alternately with the first engaging pieces 4b, are formed slightly wide and extend diagonally upward, and have an arcuate tip corresponding to the variable shaft 3. The variable shaft 3 is engaged with the variable shaft 3 from both sides thereof. Furthermore, the third engaging piece 4d
extend upward from the outer edge of the ring body 4a in a pair facing each other, and the adjustment pins 5
It is becoming more and more engaged.

The adjustment pin 5 is composed of an operating shaft 5a and an orthogonal shaft 5b.The operating shaft 5a is inserted into a mounting hole 6a of the case 6, and is rotatably mounted to the case 6 by a head 5c and a stopper 7. Further, the orthogonal shaft 5b is fixed to the tip of the operating shaft 5a in a direction orthogonal to the operating shaft 5a, and the third engagement piece 4d
It is designed to engage in a cross shape.

Next, the attachment operation and adjustment operation of the connection ring 4 will be explained.

First, the connecting ring 4 is connected to the variable shaft 3 through the insertion hole 4e.
When pushed in, the second engagement piece 4c clamps the variable shaft 3 from both sides, and the tip of the engagement piece 4c bites into the side surface of the variable shaft 3, preventing the ring 4 from coming off. At the same time, the horizontal portion 4g of the first engagement piece 4b faces the U-shaped groove 3a and engages with the variable shaft 3, so that the rotation of the connecting ring 4 is transmitted to the variable shaft 3.

Then, when the adjustment pin 5 is attached to the case 6 and engaged with the orthogonal shaft 5b and the third engagement piece 4d, the rotation of the adjustment pin 5 brings the orthogonal shaft 5b into contact with the third engagement piece 4d and the connection is made. The ring 4 rotates, and the variable shaft 3 is rotated by the first engagement piece 4b. This allows the variable shaft 3 to be adjusted externally.

In this embodiment, the trimmer 1 is a variable resistor, but a capacitor or the like may be used, and the first and third engaging pieces 4b, 4d are not limited to a pair; The engagement between the shaft 5b and the third engagement piece 4d may be achieved by forming a groove or the like on the engagement piece 4d to engage the orthogonal shaft 5b, other than in the embodiment.

As described above, according to this invention, the connecting ring to be attached to the variable shaft includes a ring main body having a variable shaft insertion hole, a first engagement piece that engages with the variable shaft, and a second engagement piece that engages with the variable shaft with pressure. Consisting of an engaging piece and a third engaging piece that engages with an adjustment pin attached to the case, simply by inserting this connecting ring into the variable shaft, the variable shaft is linked to the adjustment pin and can be freely adjusted externally. Because of this, there is no need for any special processing of the variable shaft, and furthermore, unlike conventional brazing and welding work, the work can be done easily.

Furthermore, since only the connecting ring is inserted, the assembly work can be carried out quickly, and the workability is extremely high without requiring any special techniques.

Furthermore, misalignment between the adjustment pin and the variable shaft can be reliably absorbed.

[Brief explanation of drawings]

Figures 1, 2 and 3 are partial cross-sectional side views of conventional trimmers, Figures 4, 5 and 6 respectively.
The figures show one embodiment of this invention, with FIG. 4 being a partially sectional side view of the trimmer, FIG. 5 being a plan view of the connecting ring attached to the variable shaft, and FIG. 6 being a side view of the same. 1: Trimmer, 2: Main body, 3: Variable axis, 3a: U
Shape groove, 4: Connection ring, 4a: Ring body, 4
b: first engagement piece, 4c: second engagement piece, 4d: third
Engagement piece, 4e: insertion hole, 4f: rising part, 4g:
Horizontal part, 5: Adjustment pin, 5a: Operation axis, 5b: Orthogonal axis, 5c: Head, 6: Case, 6a: Mounting hole,
7: Stoppa.

Claims (1)

[Claims for Utility Model Registration] (1) A variable shaft is provided protruding from the main body disposed within the case, a connecting ring is attached to the end of the variable shaft, and this connecting ring is connected to the variable shaft. a ring body in which an insertion hole is formed; a first engagement piece that extends from the ring body at the edge of the insertion hole and engages with the variable shaft; and a first engagement piece that extends from the ring body at the edge of the insertion hole; It is composed of a pair of second engagement pieces that engage with the variable shaft with a pinching force, and a third engagement piece that extends from the outer edge of the ring body and engages with an adjustment pin, and this adjustment pin is connected to the case. A trimmer that is attached to the trimmer and is characterized by the fact that the variable shaft can be adjusted externally using this adjustment pin. (2) The adjustment pin is composed of an operating shaft held in the case and an orthogonal shaft fixed perpendicular to the operating shaft, and the orthogonal shaft is preferably engaged with the third engagement piece. The trimmer described in claim (1) of the utility model registration claim. (3) The trimmer according to claim 1, wherein the first engaging piece faces a U-shaped groove formed on the end surface of the variable shaft.