JPH0729672B2 - Push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a push button switch suitable for an electric gear cutting machine.

(B) Conventional technology Conventionally, after cutting the cutter into the can lid by operating the lever, the can lid is automatically dissected without pressing the lever, and the thrust acting on the cutter disappears when the dissection is completed. An automatic incision device that terminates incision by stopping the driving of a motor is known from Japanese Patent Publication No. 52-436.

This type of device generally has a complicated switch mechanism and requires a large switch operating lever, which makes it difficult to reduce the size and weight of the device.

(C) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and turns on the operation control push button.
An object of the present invention is to provide a push button switch that can easily maintain a state.

(D) Means for Solving Problems The present invention is provided with a part of the side surface of the push button protruding from the main body case.
While forming a locking step portion that engages with the peripheral edge of the button hole when the push button is pushed, and a groove or protrusion that engages with the guide ridge or the ridge groove that is formed to be inclined toward the body case side,
A coil spring is interposed between the first spring receiving portion of the push button and the second spring receiving portion of the main body case, and the second spring receiving portion is locked more than the first spring receiving portion when the push button is positioned above. The push button switch is characterized in that the push button switch is deviated in the direction of the step portion and is formed substantially directly below the first spring receiving portion when the push button is pushed down and is engaged with the peripheral edge of the button hole.

(E) Operation By the above means, the push button is pushed against the biasing force of the coil spring to engage the locking step portion with the peripheral edge of the button hole to maintain the operating state of the motor. The force in the mating direction acts on the push button to facilitate the engagement. Further, the operation of the motor is stopped again by releasing the engagement of the push button.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings. The gear cutting machine shown in the figure is a hand-held rechargeable gear cutting machine, which is a drive wheel (raised tooth) (1) and a front drive wheel provided on the front surface of the body case (K) so as to be rotatable. With the cutting blade (3) provided so as to be vertically movable above, the can is opened while rotating the can. The cutting machine has a drive wheel drive mechanism (A) for rotationally driving the drive wheel (1) and a cutting blade operation mechanism (B).
The drive wheel drive mechanism (A) mainly comprises a mechanical component (A ₁ ) for driving the drive wheel (1) at a low speed by the motor (5) and an electrical component (A ₂ ) for electrically controlling the motor. Including and

[1] Main body case The main body case (K) is made of synthetic resin, and the case (K ₁ ) and the rear case (K) are detachably coupled with screws (6), (7), (8) and (9). ₂ ) and a flat shape (horizontal width L ₁ >> front-back width L ₂ ) are formed, and from a functional point of view, a mechanism section (10) mainly accommodating the machine constituent part (A ₁ ).
And a grip portion (12) having a substantially U shape which is connected to the mechanism portion (10) so as to have a rectangular grip window (11). The front case (K ₁ ) is the first part (K ₁₁ ) corresponding to the mechanical part (10).
And a second part (K ₁₂ ) other than the above, and is divided into two parts. The protrusion and the groove are engaged with each other at the joint part of these two parts (K ₁₁ ) (K ₁₂ ) and the second part (K ₁₂ ) The tongue piece (13) projectingly provided so as to overlap the first portion (K ₁₁ ) and the first portion (K ₁₁ ) are polymerized and fixed by a screw (not shown).

[2] Drive Wheel Drive Mechanism-Mechanical Components (A ₁ ) Next, the drive wheel drive mechanism (A) will be described. The machine component (A ₁ ) is mainly composed of a DC motor (5) and a reduction gear mechanism (14). The motor (5) has its drive shaft (15) protruding toward the top (right end in FIG. 1) side, and the electric terminals (16) (16) toward the rear (left end in FIG. 1) side. ) At a right angle to the thickness direction (direction parallel to the paper surface of FIG. 1) and in the horizontal direction.
Partition walls (17) (18) that are erected integrally with the part (K ₁₁ ).
A drive shaft (15) is attached to the partition wall (17) so as to penetrate the partition wall (17), and is fixed to the partition wall (17) by a screw (not shown) penetrating the partition wall (17).

The reduction gear mechanism (14) is for decelerating and transmitting the rotation of the motor drive shaft (15) to the drive wheel (1) rotatably provided so as to project from the front surface of the main body case (K). 15) has a metal worm gear (21) fixedly attached to it, a large diameter synthetic resin gear (22) meshing with it, and a small diameter gear (23) located in front of it, and is inward from the first portion (K ₁₁ ). First gear (G ₁ ) rotatably supported by a metal shaft (24) protruding from the first shaft, and a large-diameter synthetic resin gear meshing with a small-diameter gear (23) of the first gear (G ₁ ). A second gear rotatably supported by a metal shaft (27) projecting inward from the first portion (K ₁₁ ) and having a metal small-diameter gear (26) located behind (25) and (G _2), the small diameter gear of the second gear (G ₂₎ (2
The third gear (G) fixed to the rear end of the metal shaft (29) that is rotatably pierced and supported by the bearing tube (28) that meshes with the first portion (K ₁₁ ) and is integrally projected with the first portion (K ₁₁ ). ₃ ) consists of. The axis (2
A screw groove (31) is formed at the front end of 9), that is, a portion protruding from the front case (K ₁ ), and the drive wheel (1) is detachably screwed to this portion. The screw groove (31) is formed so that the rotation direction (X) of the shaft (29) and the screwing direction of the drive wheel (1) are opposite to each other. The shaft (24) (27) (29)
The rear end is supported by a metal support plate (34) fixed by screws (not shown) screwed into the boss portions (32) (33) of the front case (K ₁ ).

The gear ratio of the above reduction gear mechanism (14) is set to 268: 1, for example, and the gear ratio of the worm gear (21) and the first gear (G ₁ ) is 33: 1, which is large for small gears. The following reduction ratio is obtained.

[3] drive wheel drive mechanism - electrical components (A ₂₎ electric components of the drive wheel drive mechanism (A) (A ₂₎ is as shown in Figure 15, the AC utility power outlet for plugging into (not shown) Charge plug (35), step-down transformer (T) connected to this, three secondary (rechargeable) consisting of Ni-Cd batteries connected to the secondary side of this transformer through a rectifier diode (D ₁ ). Battery (b ₁ ) (b ₂ ) (b ₃ ), operation control switch (S) provided in the energizing circuit of motor (5), diode for backflow prevention connected in series to the secondary side of transformer (T) (D ₃ ), a light emitting diode (LED) and a resistor (R) that are turned on when charging, and a diode (D ₂ ) that is connected so as to turn on the light emitting diode (LED) during operation.

Referring to FIG. 3, the charging plug (35) has a base portion (35b) made of synthetic resin having pivot shafts (35a) (35a) projecting from both ends, and two plug blades insert-molded into the base portion (35b). (35c) (3
5c), and is attached to the rear case (K ₂ ) in a position near the handle window (11) close to the motor (5) and the gear mechanism (14) so as to be retractable by rotation. Specifically, a plug accommodating recess (37) is formed in a protrusion (36) that is partially protruded according to the thickness of the motor (5) of the rear case (K ₂ ), and this recess (37) Put the plug (35) in the rear case (K ₂ )
The shafts (35a) (35a) are housed in the bearing grooves (38) (38) formed in the recess (37) from the inside. Then, the plug (35) is recessed into the recess (37) and is flush with the protrusion (36) (see FIG. 3), and the plug blades (35c) (35c) are behind the recess (37). Projected state with the case (K ₂ ) projecting vertically (see Fig. 4)
It is configured to be rotatable between and. On the other hand, in the second part (K ₁₂ ) of the front case (K ₁ ), the terminal block (41) is mounted with the fixed contact plates (39) (39) facing the plug (35).
(41) is integrally projected toward the rear case (K ₂ ), the charging plug (35) is stored in the recess (37), and the front case (K ₁ ) and the rear case (K ₂ ) are joined together. Then, the pivot shafts (35a) (35a) are fitted in the bearing recesses (42) (42) provided in the terminal blocks (41) (41). (43) is a T-shaped leaf spring installed between the terminal blocks (41) (41) and the support plate (34), and has a base (43a) in a recess between the terminal blocks (41) (41). The terminal block (41) (41) and the projecting part (34a) are laterally positioned by fitting the support plate (34) to the rear projecting part (34a), and the base part (43a) is positioned. Place on the step ribs (44) (44) provided on the terminal block (41) (41), and place it on the horizontal part (43b).
Is placed on the support plate (34) (see FIG. 1), and the protrusion (not shown) provided on the base part (35b) comes into contact with the protruding / withdrawn state due to the rotation of the charging plug (35). Holds by its own elastic deformation. If the plug blade (35c) (35c) of the charging plug (35) is protruding, the plug blade (35c) (35c)
The rear end protruding from the base part (35b) of the contact plate (39) (3
It is elastically contacted with the plug blade (35c) (35c) and contact plate (3).
9) (39) is held in electrical connection with the plug blade (3
5c) (35c) When immersed, this electrical connection is released.

The transformer (T) is a storage space (12) under the handle (12).
The ribs (45) are positioned and arranged at a position close to the motor (5) of A). Since this position is close to the charging plug (35), the high voltage wiring can be short. Two of the secondary batteries (b ₂ ) and (b ₃ ) are ribs (46) on the rear side of the transformer (T) in the lower storage space (12A) and the rising wall (47) of the front case (K ₁ ). ) And the remaining one (b ₁ ) is located at the rear end of the upper storage space (12B) of the handle (12) with the ribs (48) and the front case (K ₁ ). It is positioned and arranged with the rising wall (47). The former two (b ₂ )
(B ₃ ) are directly contacted with each other, and the other one (b ₁ ) is electrically connected using a contact plate (49), and the three are connected in series.

The operation control switch (S) includes a fixed contact plate (54) and a movable contact plate attached to a printed circuit board (53) inserted between the ribs (51) and the ribs (52) of the front case (K ₁ ). (Five
5) is mainly composed of a first push button (56) for pressing the movable contact plate (55). Referring to FIG. 6, the first push button (56) is a semi-circular groove (57a) formed on the rising wall (47) of the front case (K ₁ ).
And a semicircular groove (57) formed on the rising wall (58) of the rear case (K ₂ ).
a) A tubular part (56) that can be inserted into the buttonhole (57)
a) and the first operating portion (56b) integrally connected to the lower end of the tubular portion (56a) so as to face the pressing portion (55a) of the movable contact plate (55), and the tubular portion (56b). 56a) It is composed of a second operating part (56c) which is continuously provided on the opposite side of the lower end from the first operating part (56b) and which has an inclined surface (50) formed by obliquely notching the upper surface of the leading side corner part. The cylindrical portion (56a) has one end engaged with the peripheral edge (58) of the button hole (57), and the locking step portion (59) for keeping the movable contact plate (55) in contact with the fixed contact plate (54). ) Is formed. In order to stabilize the engagement state between the step portion (59) and the peripheral edge (58) of the button hole, the contact between the upper surface of the first operating portion (56b) and the peripheral projection (60) of the button hole (57) (first (See Fig. 8). The protrusion (60) is fitted in the groove (56e) of the push button (56) in FIG.

Various measures have been taken to facilitate the engagement of the stepped portion (59). First, a pair of guide ridges (61) (61) formed on the front side and the rear side of the lower end of the tubular portion (56a) on the front case (K ₁ ) and the rear case (K ₂ ) (the rear case side is not shown). Guide grooves (62) (62) (not shown on the front side) are formed into which the (not shown) is inserted. This guide ridge (61) (6
1) extends vertically, but the upper (61a) and lower (61a)
b) and left and right are deviated from each other, that is, the lower part (61b) is deviated to the top (right end in FIG. 1) side with respect to the upper part (61a), and the middle part (61a) is directed downward. It is formed to incline to. The left and right widths of the above-mentioned grooves (62) (62) are the ridges (6
1) The width (thickness) of the left and right of (61) is set to be a predetermined width larger than that of the push button (56) so that the push button (56) can be smoothly moved up and down. In this embodiment, when the push button (56) is pushed due to the presence of the inclined intermediate portion (61c), the push button (56) is displaced to the leading side.

Next, the first tubular spring receiver (56d) formed inside the tubular portion (56a) (see FIGS. 1A and 1B) and the front case (K ₁ ).
The coil spring (64) is interposed between the disc-shaped second spring receiver (63) and the disc-shaped second spring receiver (63), and the disc-shaped spring receiver (63) is attached to the center (D ₁ ) of the tubular spring receiver (56d). By displacing the center (D ₂ ) toward the top, the lower part is displaced relative to the upper part of the coil spring (64) (see Fig. 1 (a) (b)), and the coil spring (64) is The push button (56) receives the force of moving in the front direction by the shape restoring force.

Further, the pressing portion (55a) of the movable contact plate (55) is bent downward to form a mountain shape, and the pressing portion (55a) is formed into the first operating portion (56).
The push protrusion (65) in (b) is used to push the push button (56), and the elastic force of the movable contact plate (55) urges the push portion (55a) toward the front. In addition, the tubular part (5
The rear side of the upper surface of 6a) is formed in the low step portion (66 ') and the inclined surface (67) is formed between the rear surface and the high step portion (66 "). With this structure, the push button (56) is pushed by the thumb. Pushing the top surface tends to generate force in the front direction.

The diodes (D ₁ ) (D ₂ ) (D ₃ ) and the resistor (R) are attached to the lower surface side of the printed circuit board (53), and the light emitting diode (LED) extends the front side of the printed circuit board (53). Further, the tip end is exposed on the upper surface of the window (68) formed on the upper surface of the first portion (K ₁₁ ) so as to stand upright on the front surface side of the third gear (G ₃ ).

[4] Cutting Blade Operating Mechanism (B) Next, the configuration of the cutting blade operating mechanism (B) will be described. This mechanism (B) is attached to the upper part of the first part (K ₁₁ ) of the main body case (K). Referring to FIG. 5, (71) is provided with a rotary shaft (73) rotatably supported in a shaft hole (72) formed in the first portion (K ₁₁ ) in the main body case (K). A cutting blade (3) is detachably fixed to the tip of the rotating shaft (73) by a metal interlocking plate that is rotatably provided, and the cutting blade (3) is a fulcrum (74), that is, a rotating shaft (73). It is rotatable around the central axis. The tip fixing portion (73a) of the rotating shaft (73) is smaller in diameter than the other portion and is formed in a square shape (as long as it is non-circular), and the fixing lever (75a) has a corner formed by a synthetic resin lever (75). After being press-fitted in the hole (76), the cutting blade (3) is fitted in the square hole (77) formed in the upper part thereof and having a shape matching the fixing portion (73a), and the screw formed in the fixing portion (73a). The fixing portion (73a) is fixed by a screw (79) screwed into the hole (78).

The lever (75) has a function of holding the interlocking plate (71) so as not to easily fall out of the main body case (K) by press fitting, and a constant distance of the cutting blade (3) from the front surface of the main body (K). It has a function of a spacer that forms a handle piece (75a) integrally with the upper edge of the lever (75) in the front, and puts a finger on the handle piece (75a) to move the lever (75) upward. It is configured to also function as a blade-raising lever that is rotated to. The rear end of the handle piece (75a) has an arm support (9
It abuts the upper surface of 0) to regulate the rotation of the cutting blade (3) in the pulling down direction.

The cutting blade (3) has a substantially rectangular shape as shown in FIG. 14, and has a fulcrum (74) between the lower end of the side edge (3A) on the leading side and the lower end of the side edge (3B) on the rear side (right side in the same figure). ) Is formed in the shape of an arc, and the lower end corner (corner side corner) on the front side is cut out to form an acute bite edge (3D). One end of the interlocking plate (71) is locked in the main body case (K) and the other end is locked by a protrusion (71d) formed on the interlocking plate (71) by a coil spring (biasing means) (82). Fifth
It is urged in the P direction as viewed in the figure, that is, in the blade lowering direction.

Referring to FIGS. 6 and 13, (83) is a synthetic resin second push button for raising the blade, which is provided on the top side of the body case (K) by the first push button (56). ) A cylindrical portion (83a) that slides up and down in a button hole (84) formed on the upper surface of the), a blade-raising first operating portion (83b) integrally formed at the lower end of the tubular portion (83a), and a second operating portion for stopping operation ( 83c) and a coil spring (86) interposed between a spring receiver (85) formed in the main body case (K) and a spring receiver (83d) formed inside itself (see FIG. 1). Always biased upward. The second operating portion (83c) is the first push button (5
6) A slope (87) is formed above the slope (50) of the second actuating portion (56c) (see FIG. 8), and the second push button (83) is formed.
By pressing, the first push button (56) is displaced in the rearward direction, and the engagement of the push button (56) is released. The slopes (50) (87) may have either one. (89) (89) is a pair of guide ribs (not shown on the rear case side) formed on the front case (K ₁ ) and the rear case (K ₂ ), which are formed on the front side and the rear side of the tubular portion (83a). Grooves (91) (91) (front side not shown)
To guide the tubular portion (83a) up and down. (92)
Is a synthetic resin actuating lever rotatably supported by a shaft (93) projecting in the main body case (K), and hits the actuating part (83b) when the second push button (83) is pushed in the middle part. A pin (71) provided with a first engaging portion (92a) protruding so as to be in close contact with the pin, and a pin (71) protruding on the interlocking plate (71) at the tip of the operating lever (92).
It has a second engaging portion (92b) that abuts and engages with a). The actuating lever (92) is integrally formed with an actuating arm (92c) which is easily elastically deformable in the upper middle part, and has a second push button (83) at the tip thereof.
The engaging groove (71) formed in the interlocking plate (71) when is pressed.
The pin-shaped engaging portion (94) for engaging with b) is formed, and the release arm portion (92d) is provided on the side opposite to the operating arm portion (92c) with respect to the shaft (93) of the first push button (56). The second operating portion (56c) is formed so as to face the second operating portion (56c), and when the first push button (56) descends, the second operating portion (56c) pushes the release arm portion (92d) to form the aforementioned engaging groove portion (71b). The engagement with the engagement part (94) is released.

Reference numeral (95) is a U-shaped leaf spring attached to the main body case (K), and when the cutting blade (3) is in the lowered state, the interlocking plate (71) is provided.
The blade support plate (71) is abutted against the protrusion (71c) of the blade and slightly urges the blade support plate (71) in the blade pulling-up direction. A force is exerted on the cutting blade (3) in the pulling direction to facilitate pulling up of the cutting blade (3).

(96) is a can support provided on the front surface of the main body case (K),
The can (N) is appropriately separated from the case (K). (9
7) is a cane holding shaft, and (98) is a magnet for attracting a can lid attached to a horizontally rotatable arm (99).

In the above-mentioned component arrangement, the mounting position of the charging plug (35) is close to the heavy motor (5) and the reduction gear mechanism (14), and the motor (5) and the reduction gear are centered around the charging plug (35). A transformer (T) and a secondary battery (b ₁ ), which are next to the mechanism (14) and have the heaviest weight, are placed on the side substantially opposite to the mechanism (14)
By arranging (b ₃ ) to balance the left and right weights, the center of gravity (O) of the device is at the position shown in FIG. 3 and is close to the charging plug (35). As a result, when the charging plug (35) is inserted into a power outlet for charging, an excessive rotational moment is not applied to the charging plug, and damage to the charging plug (35) can be prevented.

The operation of the above configuration will be described. The cutting blade (3) is pulled up to the initial state (see the dashed line in FIGS. 6 and 1)
In order to perform the chopping operation, the can (N) is held by the left hand, the edge (winding tightening portion) thereof is placed on the drive wheel (1), and the side surface is brought into contact with the support base (96). Then the first
When the push button (56) is pressed, the operating lever (92) is rotated to release the engagement between the interlocking plate (71) and the operating lever (92), the cutting blade (3) is lowered, and the edge (3D) is removed. It comes into contact with the lid (N ₁ ) (see Fig. 7). Further, when the first push button (56) is pushed, the contacts (54) (55) come into contact and the operation control switch (S)
Is turned on, and this state is maintained by the engagement of the stepped portion (59) (see FIG. 8). When the operation control switch (S) is turned on, the drive wheel (1) starts to rotate, the can (N) rotates, and the cutting blade (3) automatically moves from the edge (3D) to the lid (N ₁ ) easily. The bite lid (N ₁ ) is cut. After cutting the lid (N ₁ ),
When the second push button (83) is pushed halfway, the second operating portion (83c) comes into contact with the second operating portion (56c) of the first push button (56) and the first push button (56) is disengaged. After returning upward, the operation control switch value (S) is turned off and the motor (5) is stopped (see FIG. 6). Next, hold the can (N) with your left hand and push the second push button (83) to the end to rotate the operating lever (92), and the operating lever (92) rotates the interlocking plate (71) to rotate the cutting blade. (3) is pulled up, and the engaging portion (94) and the engaging groove portion (71
This raised state is maintained by the engagement with b), and the initial state is restored. The can (N) can be removed in this state.

If the secondary battery is discharged during the above cut-off operation,
As shown in Fig. 14, the cutting blade is in the biting state, but the cutting blade (3)
Since the shape of the blade edge is formed in an arc shape centering on the fulcrum (74), pressing the push button (83) does not cause the blade edge to catch on the incision edge (100) of the lid (N ₁ ), making it easier to cut. The blade (3) can be pulled up. If it is difficult to pull up with the push button (83), the lever (75) can be held by hand. The present invention is not limited to the above embodiment, and the grooves (62) (62) are provided on the first push button (56) side,
Although the protrusions (61) (61) are formed on the body case (K) side, a protrusion (not shown) is formed on the first push button (56) side, and a protrusion that guides the protrusion on the body case (K) side. A groove (not shown) may be formed.

(G) Effect As described above, according to the present invention, since the engaging step portion that engages with the peripheral edge of the button hole when the push button is pushed is provided on a part of the side surface of the push button, the push state can be maintained. The mechanism does not need to be provided on the switch contact side, the structure is simple, and when the push button is pushed down, it is guided by the guide ridges or grooves formed in the main body with inclination, so the push button It is easy to engage with the peripheral edge of the hole, and the second spring receiving portion provided on the body case side is deviated in the locking step direction from the center of the first spring receiving portion when the push button is positioned higher. Moreover, since the push button is formed almost directly below the first spring receiving portion when it is engaged with the peripheral edge of the button hole, the engaging force between the push button and the peripheral edge of the button hole becomes strong, and the pressed state is reliably retained. can do.

[Brief description of drawings]

1 to 15 each show an embodiment of the present invention. FIG. 1 (a) is a rear view of a partial cross section with a rear case removed, and FIG. 1 (b) is an enlarged view of a main part. 2 is an overall front view, FIG. 3 is an overall rear view, and FIG.
FIG. 5 is an overall top view, FIG. 5 is a sectional view taken along line VV of FIG. 1, FIGS. 6 to 8 are explanatory views showing different operating states, and FIGS. 9 and 10 are different operating states. An explanatory diagram showing
FIG. 11 is an exploded perspective view of a main part, FIGS. 12 and 13 are perspective views of components, FIG. 14 is an explanatory view of a cutting operation, and FIG. 15 is an electric circuit diagram. (1) …… Drive wheel, (3) …… Cutting blade, (5) …… Motor, (K) …… Main body case, (54) (55) …… Contacts,
(56) ... push button, (56d) ... first spring receiver, (57) ...
… Button hole, (58) …… perimeter, (59) …… stop step, (6
1) ridge, (62) groove, (63) second spring support, (64) coil spring.

Claims (1)

[Claims] Claim: What is claimed is: 1. A push step projecting from the main body case, a part of a side surface of the push button engaging with a peripheral edge of a button hole when the push button is pushed, and a guide ridge formed slantingly in the main body case. Alternatively, a groove or a protrusion that engages with each groove is formed, and a coil spring is interposed between the first spring receiving portion of the push button and the second spring receiving portion of the main body case. When the push button is pushed down and is engaged with the peripheral edge of the button hole, it is located substantially directly below the first spring receiving portion when it is displaced from the first spring receiving portion when it is located. Push button switch characterized by being formed.