JPH0442878Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a weight attachment mechanism for a keyboard instrument, particularly an electronic keyboard instrument.

(Prior Art) This type of keyboard is manufactured by molding synthetic resin, and has a hollow structure that is open at the bottom. Weights are attached to the keyboard in order to achieve a piano touch or to maintain an appropriate balance, but in the past, weights were attached to the keyboard due to the structure being fixed with adhesive, which caused variations in weight and also due to aging. There was a problem with the weights falling off easily.

(Technical Issues) The purpose of the present invention is to solve the above-mentioned problems, to ensure that the weight can be mounted reliably, easily, and without variation, to have high reliability after mounting, and to be highly practical without increasing costs. An object of the present invention is to provide a weight mounting mechanism for a keyboard.

(Technical Means) In order to achieve the above object, the present invention provides a recess 2 for attaching a weight on the lower surface of the keyboard body 1, and a stop shaft 4 that protrudes laterally on the weight 3 that fits in the recess 2. A stop groove 5 with which the stop shaft 4 engages is formed on the side wall of the recess 2.

(Example) The following description will be made based on the illustrated example. The keyboard body 1 is manufactured by molding a synthetic resin and has a hollow structure with an open bottom surface.
A part of the recess 2 is used for attaching a weight. 7
indicates a partition. The recess 2 in the embodiment is provided at the tip of the keyboard body 1, and is continuous with a stopper 8 also provided at the tip.

The weight 3 is made of a metal with a relatively large specific gravity, and has a weight set in relation to a spring 15, which will be described later, and which in the embodiment is similarly provided for the purpose of obtaining a piano touch. The weight 3 has stop shafts 4 protruding from predetermined positions on both the left and right sides, which are engaged with substantially U-shaped stop grooves 5 formed in the left and right pieces 9 of the stopper 8, respectively. It is also fixed to the keyboard body 1 using an adhesive 10. Since the stop groove 5 enters the side piece 9 in the lateral direction, the load of the weight 3 will be applied even if the adhesive 10 deteriorates due to aging. Note that even if the stop shaft 4 is provided on the side wall and the stop groove 5 is provided on the keyboard body 1, the effect remains the same.

When the stop shaft 4 and the stop groove 5 are engaged, the weight 3 maintains a constant positional relationship. That is, as shown in FIG. 3, the adhesive 10 is injected into the recess 2, and when the weight 3 is attached using the stop shaft 4 and the stop groove 5, the adhesive 10 wraps around the inner end of the weight 3. and stay in a certain position. In each figure,
11 is the chassis of the keyboard; 12 is a level cross to which the stopper 8 is engaged; 13 is a stop cross against which the keyboard body 1 comes into contact when a key is pressed; 14 is a key fulcrum; This gives restoring force to the keyboard body 1. Further, 18 is an electric signal switch, 19 is an actor that presses it, and 20 is a black key, which has the same structure as the above-mentioned white key.

(Operation and effect of the invention) In the keyboard configured as described above, the weight 3 is engaged with the stop groove 5 of the keyboard body 1 with its stop shaft 4, so that the position of the weight 3 with respect to the keyboard body 1 is constant. Moreover, since the weight 3 is fixed to the keyboard body 1 by engagement, it is not necessary to hold it until the adhesive 10 hardens.

Therefore, according to the present invention, the work of attaching the weight 3 to the keyboard body 1 can be done extremely easily and reliably, and since there is no variation, the overall balance of the keyboard can be improved, and the weight 3 can be attached to the keyboard body 1 after attachment. Reliability is increased because there is no risk of the stopper 3 falling off, and since both the stop shaft 4 and stop groove 5 can be provided during molding, the number of parts does not increase, improving workability and contributing to cost reduction. There is.

[Brief explanation of the drawing]

The drawings show an embodiment of the keyboard weight attachment mechanism according to the present invention.
The figure is a partial perspective view, and FIG. 3 is a sectional view of the installed state. 1...keyboard body, 2...recess, 3...weight, 4
... Stop shaft, 5 ... Stop groove.

Claims (1)

[Scope of utility model registration request] A recess 2 for attaching a weight is provided on the lower surface of the keyboard body 1, a stop shaft 4 that protrudes laterally is provided on the weight 3 that fits in the recess 2, and a stop groove 5 with which the stop shaft 4 engages is provided in the recess 2. Keyboard weight attachment mechanism formed on the side wall.