JPS5850358Y2 - pedal keyboard - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved pedal keyboard that can be assembled by simply inserting a key member from the front of the chassis without using any fastening parts such as screws.

Various types of pedal keyboards for electronic musical instruments have been proposed in the past, but most of them require fastening parts such as bolts, nuts, screws, etc. during assembly, so the number of parts used is limited. Many of them were unsuitable for automated assembly.

The purpose of this invention is to provide a new pedal keyboard that uses fewer parts and can be easily assembled.

One of the main features of this invention is that the key is inserted between the chassis and the key on the rear end side of the key by inserting the key through the windows provided at the front and rear of the chassis. The point is that several interlocking and retaining parts are formed.

In this invention, by skillfully arranging the interlocking and retaining parts in this way, there is no need to use fastening parts such as screws to attach the key member to the chassis, so the number of parts is reduced and assembly is automated. becomes possible.

This invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a partially sectional side view of a pedal keyboard according to an embodiment of the invention, and 10 and 12 are the bottom plate and front plate of the keyboard instrument, respectively.

A chassis 14 made by pressing or punching a single plate is attached to the bottom plate 10 and the front plate 12.

As the detailed structure of the chassis 14 is shown in FIG.
Windows for key insertion, that is, a front corner window 24 and a rear corner window 26, are formed at opposite positions of the rear portion 14B.

In the vicinity of the rear corner window 26, the bottom surface of the chassis 14 is machined to have a step 18, on which is formed an elongated projection 20 which acts as a key fulcrum.

On the other hand, near the front corner window 24, a first stopper 44 made of rubber or the like is arranged on the bottom surface of the chassis.

Above the first collar 44, there is a cut-out portion 16 connected to and protruding from the upper edge of the front corner window 24.
A second stopper 48 made of flocked felt or the like is disposed on the lower surface of the holder.

These stoppers 44 and 48 are for limiting the vertical swing range of the key portion $730.

The chassis 14 has a switch holding portion 22 bent from the rear portion 14B to the front side at a right angle.

A key switch 52 having a movable contact 54 sandwiched between upper and lower fixed contacts 56, 58 is attached to the upper surface of this switch holding portion 22.

The movable contact 54 of the key switch 52 is driven by the actuator 50, and the tip of the switch holding part 22 is inclined upward so that the engaging piece 32 of the key member 30 can be easily guided to the rear corner window 26. are doing.

The key member 30 inserted through the front corner window 24 and the rear corner window 26 of the chassis 14 has a characteristic structure at its rear end, as shown in FIG. 3, which shows the detailed structure of the rear end.

That is, the rear end of the key member 30 is formed by arranging a metal member having a U-shaped cross section so that its opening faces downward, and the lower part of the rear end is connected to the protrusion 20 as the key fulcrum of the chassis 14. A matching recess 40, 42 is formed, and an engagement piece 32 is formed at the upper rear end.

This retaining piece 32 is composed of a central piece that is sandwiched between two grooves 36° and 38 formed at the upper part of the rear end, and a concave portion 34 is formed on the upper surface by press working. There is.

The retaining piece 32 has a concave portion 34 that is connected to the rear corner window 2 of the chassis 14.
In order to be able to engage the upper edge of 6 in an elastically biased manner, it is recommended to bend it slightly upwardly before assembly, as shown at 32 in FIGS. 1 and 3. preferable.

An actuator 50 is provided on the top of the key member 30 to drive the movable contact 54 of the key switch 52.

Further, a recess 31 in which one end of a coil spring 46 is inserted is provided in the lower part of the key member 30 at a position corresponding to the stopper installation position, and this coil spring 46 always moves the key member 30 from below toward the second stopper 48. The key member 30 is pushed up elastically to return the key member 30 to its initial position when the key is not pressed.

The pedal keyboard configured as described above can be easily assembled as follows.

First, the chassis shown in FIG. 2, on which the stoppers 44 and 48 have been attached in advance, is attached to the bottom plate 1 using a suitable adhesive or fixing device so that the chassis is arranged as shown in FIG.
0 and front plate 12.

Next, the key member 30, on which the actuator 50 and the coil spring 46 have been previously attached to predetermined positions, is inserted from the rear end into the rear corner window 26 through the front corner window 24 of the chassis 14, and the two locking members are inserted at the rear end side. Give form to the department.

That is, the first engagement part is formed between the concave part 34 of the engagement piece 32 and the upper edge of the rear corner window 26, and the second engagement part is formed between the fulcrum protrusion 20 and the concave part 40. to form between.

Furthermore, a protrusion 33 is provided near the front corner window 24 of the chassis 14.
．． Coil spring 46 held in recess 31 by 33'
is inserted into the inside of the stopper 44 provided on the bottom surface of the chassis 14, and the key member 30 is biased toward the stopper 48 to complete the assembly of the pedal keyboard.

In the pedal keyboard assembled in this way, by pushing the front end of the key member 30 protruding from the chassis 14 downward until it abuts the stopper 44, the key switch 52 is driven via the actuator 50, and the key switch 52 is moved. The contact position of the contact 54 can be switched from the fixed contact 56 side to the fixed contact 58 side, and when the external force applied to the key member 30 is removed, the key member 30 comes into contact with the stopper 48 due to the elastic force of the coil spring 46. Return to initial position.

In the above description of the embodiment, the chassis 14 has a bottom surface and is open upward, but a chassis 14 that does not have a bottom surface and is open downward may also be used.

In this case, the key member may be suspended from the top surface of the chassis by a spring in order to hold the key member in its initial position.

As is clear from the above detailed description, the pedal keyboard according to this invention has a very simple structure, uses a small number of parts, and in particular does not require any fastening parts such as screws.

Furthermore, it can be easily assembled in a one-touch manner using the method exemplified above, which is extremely useful for saving labor or automating assembly work.

[Brief explanation of the drawing]

1 is a partially sectional side view showing a pedal keyboard according to an embodiment of the invention, FIG. 2 is a perspective view showing the chassis of the pedal keyboard of FIG. 1, and FIG. 3 is a side view of the pedal keyboard of FIG. 1. It is a perspective view showing the rear part of the key member in a keyboard. 10...Bottom plate, 12...Front plate, 14.
...Chassis, 14A...Front of chassis, 14B...Rear of chassis, 20...
Protrusion for fulcrum, 24...Front corner window, 26...
... Rear corner window, 30 ... Key member, 32 ...
...Engagement piece, 34... Window engagement recess, 40
...Fulcrum engagement recess, 46...Coil spring.

Claims (1)

[Claims for Utility Model Registration] (a) A chassis that connects a front part and a rear part that are arranged opposite to each other, and a key insertion window part is provided at a position facing each other in the front part and the rear part. (b) The front and rear portions of the chassis are provided with a protruding portion as a key fulcrum in the vicinity of the window portion of the rear portion; A key member inserted into the window from the rear end side, the lower rear end being provided with a recess that engages with the protrusion, and the upper rear end being sandwiched between a pair of grooves. A retaining piece consisting of a central piece is provided, and an upper portion of the retaining piece is integrally formed with a recessed portion that engages an upper edge of the rear window portion of the chassis in an elastically biased manner. (C) means for limiting the swing range of the key member; (d)
A pedal keyboard comprising means for elastically biasing the key member so as to return the key member to an initial position when the key is not pressed.