JPH0278852A - Method for making air conditioning louver knob - Google Patents

Abstract

PURPOSE:Not to provide any trouble to a through-hole formation using a core element and further to enable an integral formation of a lip part to be attained by a method wherein a step for forming a through-hole into which a fin member requiring the core element is inserted through and another step for forming a lip part projected toward inward part of the through-hole acting to make a certain trouble by the core element are separately carried out. CONSTITUTION:An entire knob is injection molded by a thermoplastic resin, and a knob part 41 inserted into a lateral fin 3 and an engaging part 42 to be engaged with a vertical fin 2 are integrally formed. The knob 41 is formed with a groove 41a at a central part of an outer circumference and in turn at its inner part is applied a core element 6 to form a straight through-hole 43 and at the same time a flange 44 extending in a through-pass direction is formed at a projecting part 43 projecting toward the engaging part 42 at a central part of the throughhole 42 and at its end part. Then, the flange part 44 is cut into a wedge of 3 to 5mm inwardly within a thickness range of 0.5 to 1mm, a lip portion 5 is formed so as to be directed inwardly and its extreme end being projected by 1 to 2mm.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an air conditioning louver knob.

(Prior art and its problems) In general, an air conditioning louver is made up of a plurality of vertical fins and a plurality of horizontal fins arranged in an intersecting manner to form the air outlet of a car air conditioner. When operated, the vertical fins move left and right, and the horizontal fins move up and down, allowing the wind direction to be adjusted. Therefore, there is a functional gap between the horizontal fin and the knob inserted therein, and there is a drawback in that the horizontal fin is subjected to vibration and rattling occurs. Therefore, Jikko Sho 62-3
No. 7071 attempts to eliminate the chatter phenomenon between the knob and the horizontal fin by inserting the knob and the horizontal fin through an elastic member.

However, there is a problem in that it is difficult to assemble a separate elastic member into the knob and insert it through the horizontal fins.

(Problem of the Invention) Therefore, an object of the present invention is to provide a method for manufacturing an air conditioning louver knob that can prevent rattling between the knob and the horizontal fin by integrally molding the knob without using a separate member.

(Means for Solving the Problems) The present invention provides a method for manufacturing an air conditioning louver knob having a through hole through which a wind direction adjustment fin member is inserted, including a first step of injection molding a knob having a straight through hole with a thermoplastic resin; and a second step of forming a lip portion protruding inward of the hole at the end of the through hole.

The thermoplastic resin used in the present invention must be selected so that the lip portion protruding inward of the hole has elasticity that can prevent rattling between the knob and the horizontal fin. , polypropylene resin, polyethylene resin may be used.

The shape of the lip portion protruding inwardly from the through hole may be any shape as long as it can apply a pressing force to the wind direction adjusting fin through which the knob is inserted, usually the horizontal fin.

(Function) According to the present invention, there is a step of forming a through-hole through which a fin member requiring a core is inserted, and a step of forming a lip portion that protrudes inward of the through-hole that is obstructed by the core. Since these are separated into separate steps, the lip portion can be integrally formed without interfering with through-hole formation using a core.

In addition, in the above-mentioned first step, preferably "
The protrusion may be formed in a direction opposite to the protruding direction of the lip portion.

Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.

(Example) Fig. 1 is a partial front view of an air conditioning louver, in which a plurality of vertical fins 2 are arranged in tandem at a fixed interval so as to be rotatable left and right in the air outlet of a car air conditioner. , a plurality of horizontal fins 3 are arranged crosswise at regular intervals so as to be rotatable up and down, and a knob 4 is inserted through the horizontal fins 3 in the center.
When you slide left and right, all the vertical fins rotate left and right, as shown in the cross-sectional view along the ■-■ line in Figure 2.
When the horizontal fins 3 are rotated up and down with the knob 4, all the structure fins 3 are moved up and down, respectively, so that the wind direction can be adjusted.

In the present invention, the knob 4 inserted through the horizontal fin 3 is manufactured as follows.

The first example is as shown in Figures 3(a) and (b).
(a) First, in a first step, the entire knob is injection molded from a thermoplastic resin, and the knob portion 41 that is inserted into the horizontal fin 3 and the engaging portion 42 that engages with the vertical fin 2 are integrally molded. In the above-mentioned knob part 41, >tη4+a is formed at the center of the outer periphery, while a straight through hole 4 is formed inside using the core 6.
3, and a protrusion 43a protruding in the direction of the engaging portion 42 at the center of the through hole 42, and a flange portion 44 extending in the penetrating direction at the end.

(b) Next, the flange portion 44 is attached to a thickness of 0.5 to 1 m.
A wedge-shaped cut is made inward by 3 to 5 mm in the range of m, and the lip portion 5 is formed so that the tip protrudes 1 to 2 mm inward from the through hole.

In the second example, (a) in the first step, the flange portion 44
At the tip of the cut groove 44a, a remaining thickness of 0.5 to I
Molding is performed in the same manner as in the first example except that the lip portion 5 is connected in the n+n+ range and protrudes in a wedge shape by 3 to 5 mm. (b) Then, in the second step, the inside of the through hole is formed through the cut groove 44a. The lip portion 5 is formed by bending the tip by hand or machining so that it protrudes 1 to 2 mm toward the direction.

As shown in FIG. 5, the formed lip portion 5 presses the horizontal fin 3 inserted into the through hole 43 against the inner wall of the through hole 43 on the other side due to its elasticity.
Together with the inner protrusion 43a, there are three points, thereby reducing the sliding resistance of the knob 4 against the horizontal fin 3 and preventing rattling between the two.

(Effects of the Invention) As is clear from the above description, according to the present invention, in the method of manufacturing an air conditioning louver knob having a through hole through which a wind direction adjusting fin member is inserted, the through hole through which a fin member requiring a core is inserted is provided. The formation of the hole and the formation of the lip part that protrudes inward of the through-hole where the core becomes an obstacle are separated into separate processes, and in the first step, the knob with the straight through-hole is made of thermoplastic resin. Injection molding is performed, and in the second step, a lip part that protrudes inward of the hole is formed at the end of the through hole, so it does not interfere with the formation of the through hole using a core, and the lip part The parts can be integrally formed, and the mold structure can be simplified.

In the first step, three-point support can be achieved by forming protrusions at appropriate locations of the through hole, preferably in a direction opposite to the protruding direction of the lip portion, within a range that does not interfere with the use of the core. This makes it possible to reduce sliding resistance and prevent rattling between the knob and the sliding fin.

[Brief explanation of the drawing]

FIG. 1 is a partial front view of the air conditioning louver, FIG. 2 is a sectional view taken along the line ■-■ in FIG. An explanatory diagram showing Fig. 4 (a
) and (b) are explanatory diagrams showing the steps of a second example according to the present invention, and FIG. 5 is a sectional view for explaining the function of an air conditioning louver knob manufactured by the method of the present invention. 2. Vertical fin, 3. Horizontal fin, 4. Knob, 5.
・・Lip part,

Claims (1)

[Claims] 1. In a method for manufacturing an air conditioning louver knob having a through hole through which a wind direction adjustment fin member is inserted, a first step of injection molding a knob having a straight through hole with thermoplastic resin; and a second step of forming a lip portion projecting toward.