JPS61203961A - Protective shield and manual electric switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the position of a light-transmitting opening in a protective shield body and the method for transmitting light to a screen that is extremely light-transmissive, such as a welded glass. A welding helmet equipped with such a screen, or a window-like Concerning a protective shield that protects the eyes from light rays.

[Conventional technology]

Such shields are described, for example, in U.S. Patent No. 283
It is known from No. 3936. In this patent, an electric motor is mounted within the shield body, the axis of which is parallel to the direction of movement of the screen.

A gear train, including bevel gears and other gears, connects the drive shaft of this electric motor to two pinions, one on each side of the screen, each in mesh with a rack on the same side of the screen. There is.

[Problem that the invention seeks to solve]

This mechanism is quite complex and contains many rather expensive parts, but it requires two racks and is especially sensitive to dirt that can accumulate between some gears and cause unreasonable operation. easy to receive. There is a lot of friction between this screen and its guide. All this means that relatively high energy requirements must be met.

Nevertheless, the considerable reduction ratio between the motor shaft and the screen avoids jamming, but this means that it takes more time to rotate the screen. , is not preferable when applied to things such as welding masks.

[Means and effects for solving the problems] This invention aims to improve the protective shield in view of the above-mentioned problems. a toothed pinion or a friction pinion in direct contact with the toothed rack or friction rack at the ends thereof, the guide means in the shield along at least one of said ends being incorporated within the shield so as to be easily removable; It is characterized by the presence of

Therefore, it is possible to guide the screen at a very limited number of points (□3), so that by directly driving the screen on one side, the total friction of the moving screen is extremely small, and its guidance is reliable. The structure is simple and the number of items is small, so it is not affected by pollution or dirt and does not react easily. Very little energy is required to move the screen, and the time required to move the screen is extremely short.

The invention also relates to details of the guide and drive means, as explained below.

In one preferred embodiment of the protective shield according to the invention, the electric motor can also be easily removed and inserted into the shield by being mounted by means of a mount that can slide frictionally within a guide in the shield body. .

No. 3,833,936, there is a trip switch on a protective shield that is operated by the welder via a mouthpiece and a liquid-filled tube. Furthermore, there are limit switches with contacts in the shield body near the four corners of the moving screen, with which the screen itself contacts in cooperation with said limit switches and manual switches in a double closing circuit. It has been incorporated.

The invention also aims to improve and simplify electrical circuits and their components, including switches.

The protective shield according to the invention therefore comprises a screen in which the screen has a protruding part near each end thereof, seen in the sliding direction, and there is a switch in the shield body cooperating with the protruding part, so that the screen When the end position is reached, one of the projections contacts the switch and moves it in one direction, and when the screen reaches the other end position,
A two-position switch which is incorporated with the switch in the shield body and can be operated by the user, with another protrusion moving the switch in the other direction, the switch being incorporated into an electrical circuit to energize a motor that moves the screen. and in the double closing circuit there is a two position switch for the reverse excitation lead for the reversible motor, so that each terminal position of one of these switches, when placed in the other terminal position, causes the motor to move in the direction of screen movement. It is characterized in that in one of the terminal positions of the further switch, which is energized to assume this other terminal position, the motor is de-energized. This not only simplifies the electrical circuit, but also makes it more reliable.

In contrast to switches that can be operated by the user, manual electrical switches according to the present invention do not require the use of foot-operated, mouth-operated switches, etc., which pose difficulties such as interference, available space inside and outside the shield, hygiene, and the risk of malfunction due to disturbance factors. Preferable than narrow type switches. However, manual switches also have marou.

The user, or welder, may perform the welding itself or for other purposes such as holding his body in the desired position, positioning the workpiece, or manipulating the light hammer to remove scale from the weld. you have to use your hands. The associated switch may be supported by a shield, for example a welding mask, or by an electrode holder or other parts to be operated by the user. These methods can only be operated when the user stops holding or operating other parts, or, as with a welding mask,
This is not desirable if the user carries his or her own shield, since the user cannot leave the task, particular tool, or workpiece without disconnecting the electrical connection between the switch and the protective shield. do not have.

The present invention aims to improve these points as well, and from this point of view, the present invention uses a manual switch having a switch body and a brace, with a space provided between the switch body and the brace so that the switch can be held with a finger. is desirable.

Therefore, the user can carry out other tasks with his hands, such as handling the electrode holder, and at the same time can operate the free switch at any time. Such a switch is
The switch body may be flat, narrow, and thin enough to allow work gloves to be worn over it without causing discomfort. The brace can also form an integral part of the glove.

The brace may be rigid or flexible.

In either case, the gap between the brace and the switch body is narrow and/or the switch has two comfortable switch bodies with the sensory side of the finger touching the switch body in one position and the back side of the finger in the other position. It is desirable to select the shape and dimensions of the brace and the switch body so that the switch has a balanced position and the switch is rotatable on a finger between these positions. When the switch is placed behind the finger, the user does not have to operate the switch.
Hammers and other tools that require manual force may be used.

〔Example〕

The invention will now be described in detail with reference to the accompanying drawings, which illustrate preferred embodiments of a protective shield, a switch and an electrical circuit of a system with such a protective shield.

Normally shaped welding masks can be used by normal methods such as manual
or by the head of a welder, which is even more common today. This mask has a rectangular central opening, and along the end face of the central casing 1, the central casing 1 is attached, for example, by screws that engage the screw holes shown in FIG. 1 near the four corners of the casing 1. ing.

The casing 1 has a rectangular opening at the end 2. This opening is located in the L-shaped guide 3 on the outside of the casing 1.
It is closed by a transparent sputtered glass 4 surrounded by the space between the parts. The flexible strip 13 elastically presses the glass 4 forward so as to come into contact with the front end of the guide 3. Second
On the left side of the figure the guide edge 3 is interrupted so that the glass 4
can be easily slid off the mask for cleaning or replacement with another piece of glass. Depending on the space within the flexible strip 13 and the L-shaped guide 3, different thicknesses of sputtered glass (or plastic) plates 4 can be used. Above the opening with the end 2, the closed side of the casing 1 has a battery, not shown in FIGS. 1 and 2, for charging a rechargeable battery 27, which will be described below. 4 comprises a group of solar cells designated 40, and these solar cells are protected by the same sputter glass 4 and therefore have a larger surface (height in FIG. 1) or a It may be protected by a sputter glass, this further sputter glass being guided in the same manner as glass 4 by a d-guide similar to guide 3 and pushed forward within said guide by a flexible strip 13, as described for glass 4. It can be removed by sliding it through the open end of the guard guide 3 and then installed.

Inside the casing 1 there is a screen 5 having a very slight transparency, such as welder glass, which completely shields the opening 2 from the fully open position (as shown in Figure 1). can be moved up or down (in Figure 1) to a position that protects the welder's eyes during welding.

This screen 5 is connected to kite rods 6a and 6b. The right-hand end of this screen (in FIG. 1) carries forks 8 which fit into tongues, one on each side of the rod 6a, said forks being part of a strip 9 connected to the screen 5. be.

The screen 5 on the left in FIG. 1 has a rod 61 at each end.
It is firmly connected to a strip 10 having ears 7a, 7b which engage the eyes at the periphery.

The screen 5 is thus correctly guided by the rods 6a and 6b in its movement between the two positions described in only three places. Each rod 5a, 5b at each end
, two opposing mounting parts 17a and 17b which are fixedly integrated with the casing 1.

It includes support brackets 16a, 16b, 16C, 16d that are frictionally accommodated between 17C and 17d.

Brackets 15a-d each have two fittings 17a-d.
It can be fitted into the space between and removed from its position under friction by a movement perpendicular to the plane of FIG.

The reversible electric motor 15 is installed between the upper leg 18 and the bottom leg 19 of the mount, and this mount is moved up and down by friction between the swallowtail guides of the mount portion 20 of the casing 1 (the first The legs 19 support a two-way slide switch 23. A slidable operating portion 24 is attached to each end of the screen 5 (the upper and lower ends as seen in FIG. 1). It is operated by projections 25 directed to this one.These projections are preferably somewhat resilient or coated with a resilient material to provide more flexibility in operation than switch 23.Lead 26 connects this switch to an electrical connection. The electric motor is connected to this electrical device by means of leads 21 in the manner described below.

The main shaft 14 of the electric motor 15 carries a pinion 12 which is in driving engagement with a toothed rack 11 that is integral with the strip 10 of the screen 5 .

With the configuration described here, the ears 7a and 7 of the screen 5
It is easy to assemble this component by inserting the rod 6b into the eye b, attaching the brackets 15a and 16b to the missing rod, and attaching the brackets l-16C and 16d to the rod 6a. Fork 8 is rod 6a
is made to engage with the bracket i5 while
Rods 6a and 6b with screens 5 are inserted into the casing 1 by pushing a-d into the mounting parts 17a-d. First, install the rod 6b, then insert the rod 6a between the tongues of the fork 8, roughly tilt the screen 5 around the rod 6b, and then insert the rod 6a.
can be easily installed. The electric motor is now mounted on the mounting part 2 of the casing 1 in the mounting 18, 19 until the pinion 12 engages the rack 11.
It can be attached by pushing it into the 0 guide. It is also very easy to disassemble these parts, for example for disassembly and cleaning, by sliding the electric motor and the screen together with the rods 5a, 5b in the opposite direction to remove them.

A rechargeable battery 27 is slidably housed between the guides 28 of the casing 1 and is attached to the electrical circuit by means of leads 29. The battery 27 can be moved by sliding between these guides for easy removal, cleaning, and replacement.

A plug connector 22 at the bottom of the casing 1 serves to make an electrical connection with a manual switch, described below, to stop the charging of the battery 27 in the absence of a solar cell or if the solar cell cannot provide sufficient charging energy. Therefore, it can also be used to make an electrical connection to a power source. A separate plug connector 42, shown on the left side of FIG. 1, can also be used for such charging.

On the right side of FIG. 1 there are two flexible restraint strips 37. The screen 5 has thickened top and bottom edges that project slightly in the direction of the eye, as viewed in FIG.

When the screen 5 is in the top or bottom position, one of these strips engages one of these thickened ends to restrain the screen 5, which prevents the screen from falling, especially when in the top position. Effective in prevention. The electric motor 15 helps to hold the screen 5 in place by magnetic positioning of its rotor, but a very light electric motor is sufficient and it is better not to rely entirely on such restraint.

FIG. 3 shows a manual two-position switch 30 according to the present invention for use with the protective shield of FIGS. 1 and 2. The switch body 31 has an elastically pressed push button 32 at an upper position corresponding to one of its switch positions, and when the push button 32 is pressed, the other switch position is assumed.

A brace (protective cover) 33 is mounted around or otherwise attached to the switch body 31 and consists of a longitudinal portion 34 and a circumferential portion 35. It can also be constructed from a completely sealed cap with a hole through which the operator's finger can be inserted. A three-core cable 36 connects this switch via the connector 22 to the electrical equipment inside the casing 1. Brace 33 may be flexible or rigid of metal, plastic material, textile material. One finger of the welder, for example the thumb, rests between portions 31.33 and 34 so as to abut the push button 32 as shown. If the brace 33 is rigid,
The brace fits snugly around the finger, but the switch casing is wider than it is tall so that the switch casing 31 and pushbutton 32 can rest against and rotate around either the rear (earth) side of the finger or its contact side. Preferably a large oval shape.

Furthermore, if the brace 33 is flexible, the human finger is thinner in the direction perpendicular to the nail than in the width direction, so these two positions are unstable considering the relatively flat shape of the switch body 31. Probably.

@) Now, referring to Figure 4, the operation of this switch and protective shield will be explained in more detail.

In the illustrated state, the circuit is closed via the switch 31 in the casing 1, the slide switch 23 and the battery 27, so that the electric motor 15 is energized. In this way, the electric motor 15 rotates, and the pinion 12 is moved by the arrow 43 in two directions.
Move the screen 5 in one of the directions indicated by . The projection 25 of the screen 5 is positioned such that the operating part 24 is in its path. Due to the movement of the screen 5, one of the protrusions 25, for example at the bottom in FIG. 4, comes into contact with the operating part 24 and moves it from the solid line position of the switch in FIG. 4 to the dotted line position. This cuts off the current to the electric motor 15 and stops the motor.

Now, when switch 31 is actuated, both switches 23 and 31 are placed in the dotted position of FIG. 4, and the circuit through electric motor 15 is again closed, but in the opposite direction so as to rotate motor 15 in the opposite direction. The screen 5 is thus moved in the opposite direction until the upper projection 25 actuates the operating part 24 of the switch 23 back to the 2-solid position.

This can be done by either pushing the push button 32 of the switch 31 or moving it elastically upward.
An electric motor 15 for moving the screen 5 to the opposite position.
excitation is cut off. It is a matter of choice whether the screen 5 is in a position in front of the window 2 when the push button 32 is depressed or when the push button 32 is opened to assume its upper position.

The battery 27 is connected via a diode 41 to a group of solar cells 40 that generate charging current. Diode 41 prevents current from flowing in the wrong direction from the battery through solar cell 40 .

The battery charging device is preferably of the type with a built-in current limiter.

Various modifications are possible within the scope of this invention.

For example, the rack 11 and the pinion 2 can be replaced by a friction strip and a cooperating friction wheel. The fork 8 on the screen 5 can be replaced with the same ears as the ears 7a, 7b.

[Brief explanation of the drawing]

FIG. 1 is a rear view of the central part of the welding mask according to the present invention, FIG. 2 is a bottom view of the welding mask as seen from below in the right half, and the left half is taken along line n-n in FIG. 3 is a side view of a manual switch used in this mask, and FIG. 4 is a diagram showing a simplified electrical circuit of the device shown in the above figure. DESCRIPTION OF SYMBOLS 1...Casing, 3...Guide-4...Sputter glass, 5...Screen, 5a, 5b...Rod, 7a, 7b...Protrusion, 8...Fork, 1
5... Electric motor, 20... Mounting base, 23... Manual switch, 27... Battery.

Claims (15)

[Claims] (1) Protecting a slightly transparent screen such as welded glass within its own plane between the position within the light-transmissive opening of the shield body and the position where said opening is opened for the passage of light rays. having means for sliding and moving in the
In protective shields to protect the eyes against intense light rays, such as welding masks, helmets or windows, equipped with such screens, the electric motor is in direct contact with the toothed or friction racks on the screen. A protective shield having a pinion or a friction pinion, the guide means in the protective shield along at least one of said ends being attached to the protective shield in such a way that it can be easily attached to and removed from the protective shield. (2) The guiding means within the shield body consists of a rod extending in the direction of movement of the screen, and the screen engages around said rod so that the length of the screen in the direction of movement is much shorter than the length of the screen in this direction. A protective shield according to claim 1, characterized in that it comprises a separate protruding portion. (3) said screen guide means in one or more projections having an opening for sliding engagement around one of said rods, said rod being easily removably mounted within the shield body; The protective shield according to claim 2, characterized in that: (4) A protective shield according to claim 2 or 3, characterized in that the guiding means of the screen comprises forks that engage fork tongues around the associated guide rod. (5) Protection according to any one of claims 1 to 4, characterized in that the screen is guided by only three points, two points on one side thereof and one point on the other side. shield. (6) The rod has a support bracket at its end, and these brackets are frictionally engaged and slidingly fit into the mounting portions in the shield body, and the sliding direction of the brackets in the mounting portion is the main surface of the screen. 5. A protective shield as claimed in any one of claims 2 to 4, characterized in that the shield is substantially perpendicular to the plane. (7) Claims 1 to 6, characterized in that the drive shaft of the electric motor is perpendicular to the main surface of the screen.
A protective shield as described in any of the paragraphs. (8) Claim 1, characterized in that the protective shield is attached to a guide means within the shield body by a friction-sliding mount so that it can be easily removed from or inserted into the shield. The protective shield according to any one of items 7 to 7. (9) The screen has protrusions near each of its ends when viewed in its sliding direction, and when the screen reaches one end position, one of the protrusions engages the switch in order to move said switch in one direction. There is a switch in the shield body which cooperates with said protruding part such that when said screen contacts and reaches the other end position, said protruding part moves the switch to the other position; said switch moves the screen; incorporated into an electrical circuit to excite an electric motor to cause
There are two-position switches that can be operated by the user, and there are also two-position switches in double-close circuits for reverse excitation leads for reversible electric motors, so that each terminal position of one of these switches is equal to the terminal position of the other switch. The motor is de-energized in one of the cases, and pressing the other switch in the other terminal position energizes the motor in the direction of movement of the screen to assume the other terminal position. The protective shield according to any one of items 1 to 8. (10) The protective shield according to claim 9, wherein the switch within the shield body is a sliding switch. (11) In a plane facing the intense light source, the solar cell system is connected via a diode to a battery that excites an electric motor and is mounted to charge this battery. A protective shield according to any one of items 1 to 10. (12) having a guide portion incorporating a slidably transparent sputtered body in a light-transmissive opening in the shield; and/
Alternatively, if a solar cell system is present, there is an elastic band in the guide part in front of the cell that elastically presses this sputtered body to one side of the guide part, so that transparent sputtered bodies of various thicknesses can be incorporated by the guide part. and the guide portion is open at least at one end to enable easy removal and insertion of the transparent sputtering body by sliding, according to any one of claims 1 to 11. protective shield. (13) The protective shield according to any one of claims 1 to 12, further comprising snap restraint means for elastically restraining the screen at its terminal position. (14) A manual electric switch characterized by having a switch body and a brace with a space between them so that a human finger can be inserted between the switch body and the brace in order to hold the switch with a finger. (15) the space between the brace and the switch body is at one position where the sensitive side of the finger abuts the switch body;
2 in the other position with the switch body abutting the back side of the finger
A manual electrical switch (16) brace according to claim 14, characterized in that it has a shape such that it has two opposed comfortable equilibrium positions, and that the switch can be rotated on the finger between these positions. Glove, characterized in that it has a manual electrical switch according to claim 15 or 16, which is part of the above.