MX2013010077A

MX2013010077A - Method and apparatus for texturing a sheet wafer.

Info

Publication number: MX2013010077A
Application number: MX2013010077A
Authority: MX
Inventors: Christine Richardson; Brown Williams; Steven Sherman
Original assignee: Max Era Inc
Priority date: 2011-03-01
Filing date: 2012-03-01
Publication date: 2014-02-27
Also published as: WO2012118960A3; TW201251099A; WO2012118960A2; CA2885922A1

Abstract

A method of texturing a sheet wafer 1) provides a sheet wafer having a front surface with a preliminary average surface roughness, and a back surface, and then 2) positions the sheet wafer on a transport mechanism. The back surface of the sheet wafer is positioned to face downwardly. Next, the method sandblasts the front surface of the sheet wafer as it is supported by the transport mechanism to cause the front surface to have a final average surface roughness. The preliminary average surface roughness is less than the final average surface roughness.

Description

ADJUSTMENT UNIT FOR HELMET SUPPORT BAND PROTECTOR, PARTICUALLY FOR FOREST WORKERS DESCRIPTION The invention relates to an adjustment unit for a support band coupled to the lower edge of the interior fittings of a protective helmet for fastening the helmet on the head of a user comprising a headband that continues on a neck band that it has two free ends connected to each other by means of a basic body, wherein the adjustment unit comprises an operating element for adjusting the support band.

Such an adjustment unit for such a protective helmet having such interior fittings is known from WO 2005/027671 Al. In this known protective helmet, the basic body is a part with a hollow curved profile having a rectangular cross section towards which ends the free ends of the neck band are inserted. The operating element of the adjustment unit is a rotary knob. The type of coupling between the rotary knob and the neck band can not be obtained from this document. It is only indicated that the adjustment unit serves to adjust an internal diameter of the support band, where the internal surface of the basic body is in close contact with the back of the helmet user's head. By adjusting the neck band when operating the operation button, the relatively sharp base body is pushed against the back of the helmet user's head. This could be rather annoying. The adjustment of the support band to the size of the helmet user's head is made at the back of the head when the helmet is worn and therefore inconvenient. When used in the forestry industry or heavy industry where guantes are used, a helmet adjustment may only be possible after the gloves have been removed. To remove the helmet, the operating element has to be released again, which can also be impossible with gloves. Therefore, helmet users could tend to adjust the support band so that the helmet can be put on and removed without having to resize once it has been adjusted. It is clear that such a helmet would not then be adjusted in a sufficiently tight fashion.

From DE 201 14 637 Ul, a band system is known which includes an automatic adjustment of the size of the helmets, in particular for sports helmets and for bicycles. The band system has to adjust to the respective head and neck sizes of helmet users. To facilitate the adjustment of the band system, the It is shaped so that it is flexible, to the point that the user can put on the helmet that includes the band system on the head. The band system automatically adjusts itself to the head and neck contour and then locks onto the helmet by means of a fastener. Here, a locking lever serves to fix a band in a desired position. The fixing lever fixes the band only in the position in which the helmet user previously adjusted it by pulling the helmet band system.

DE 44 44 188 A1 shows a bicycle helmet in which the chin and neck bands are adjusted by means of a quick-fixation device. The quick fastening device comprises a lever coupled on the outside of the helmet shell in which an adjustment band is fastened. The adjustment band is adjusted by moving the lever.

Finally, from WO 98/56270, a bicycle helmet is known which has a tension clamping device comprising an articulated adjustment lever inside an outer helmet shell. The tension applied by the adjustment lever adjusts strings to thereby establish a contact with a neck support at the back of the head.

The helmets according to the last three mentioned documents are sports helmets, particularly bicycle helmets, whose band system is not comparable to the interior accessories of a protective helmet used in the forestry industry and in industry.

The object of the invention is to provide an adjustment unit of the type mentioned at the beginning that has been shaped in such a way that it does not impair the comfort of wearing the protective helmet provided therewith and that can be easily operated on the back of the helmet. head of the helmet user even with a gloved hand.

According to the invention, this object is solved by an adjustment unit of the type mentioned at the beginning because the adjustment unit comprises a cover with which the basic body is articulated and because the operating element is a lever of adjustment linked with the basic body by means of which the basic body pivots with respect to the neck cover. In the adjustment unit according to the invention, only the basic body pivots in the direction opposite to the neck cover when the support band is adjusted. The neck cover itself can invariably remain in its most comfortable position where it comes in contact with the back of the head.

The contents of the dependent claims constitute advantageous embodiments of the adjustment unit according to the invention.

In one embodiment of the adjustment unit according to the invention, the basic body and the neck cover are connected by a transmission lever linked to the neck cover at a first end and with the basic body at a second end . The neck cover pivots freely with respect to the basic body and can therefore be adjusted to any shape of the head in such a way that the adjustment unit does not impair the wearing comfort of the protective helmet.

In a further embodiment of the adjustment unit according to the. invention, the transmission lever is linked to the basic body at a position located in the basic body above the point of attachment of the adjustment lever. Therefore, the basic body and the neck cover pivot one in relation to the other as much as possible.

In a further embodiment of the adjustment unit according to the invention, the adjustment lever is provided with a cam supported on the transmission lever in the area of its attachment point in the basic body. Therefore, when operating the adjustment lever, the cu- The neck is not affected by the adjustment process, so that there is no loss of comfort of use.

In a further embodiment of the adjustment unit according to the invention, the transmission lever at its second end is provided with a pre-tension spring which urges the first end of the transmission lever against one end of the basic body faced with the linking point of the adjustment lever. In this way, the basic body is maintained in a position on the transmission lever where the maximum adjustment path of the neck band is available.

In a further embodiment of the adjustment unit according to the invention, a spring element that is forced to pivot the neck cover in the opposite direction of the second end of the transmission lever, is arranged adjacent to the first end of the transmission lever. In this way, it is still ensured that the basic body does not affect the position of the neck cover during the adjustment process, that is, during the operation of the adjustment lever.

In a further embodiment of the adjustment unit according to the invention, the spring element is a resilient finger integrally formed in the cover of neck. In this case, the adjustment unit can be manufactured integrally and economically together with the resilient finger in a single molding process.

In a further embodiment of the adjustment unit according to the invention, the neck cover comprises at the point of attachment of the transmission lever a fork having resilient arms which engage in complementary holes at the first end of the transmission. the transmission lever with fully integrated rockers.

The neck cover can be manufactured as a separate part that can be simply connected to the transmission lever when it is added.

In a further embodiment of the adjustment unit according to the invention, the basic body comprises two surfaces having projections which can be placed in a positive coupling with complementary holes in the free ends of the neck band on both sides of the adjustment lever. This makes it possible to crudely adjust the support band to the size of the head when the helmet is not yet in place. When the helmet is on, then finally the helmet can be fastened on the head correctly with the help of the support band when operating the adjustment lever.

In a further embodiment of the adjustment unit according to the invention, the basic body is respectively provided with a hole for receiving the free ends of the neck band on both sides between the projections and the adjustment lever. This makes it possible for the free ends of the neck band, which protrude beyond the position in which the projections of the basic body are coupled to the complementary holes of the neck band, are housed in the basic body and therefore they can not be a hindrance to the helmet user while operating and freeing the adjustment unit.

The embodiments of the invention will now be described with reference to the figures in which: Figure 1 shows a subset of internal fittings of a protective helmet (not shown) provided with an adjustment unit according to the invention in which the two ends of a neck band are detachably connected by means of the adjustment unit in the neck area, Figure 2 shows a side view of a protective helmet in which the subset of interior fittings according to Figure 1 is mounted on the protective helmet together with the adjustment unit according to the invention, Figure 3 shows a sectional view of the protective helmet according to Figure 2 as seen in the backward direction, Figure 4 shows a partially cut away representation of the protective helmet according to Figure 2 as seen in the forward direction, Figure 5A shows as a detail a rear view of the adjustment unit according to the invention where an adjustment lever is shown in an inoperative state, Figure 5B shows a sectional view of the adjustment unit along the line VB-VB in Figure 5A, Figure 6A shows the adjustment unit according to Figure 5A, however, the adjustment lever is shown in the operating position, Figure 6B shows a sectional view of the adjustment unit along line VIB-VIB in Figure 6A, Figure 7 shows a plan view of the adjustment unit according to Figures 6A and 6B, and Figure 8 shows a side view of the adjustment unit according to Figure 7.

According to the illustration in Figures 1-4, a subset of interior fittings designated as 40 as a whole comprises a support cage 42 and a support band 47 comprising a headband 44, a support band 47. and a neck band 46. The band of Support 47 is provided with an adjustment unit which is designated as 48 in its entirety in the area of the neck band 46.

According to the illustration in Figures 2 and 3, a helmet shell 36 of a protective helmet 30 is provided at the lower edge of the rear part of the center of a cavity 76 behind which the adjustment unit 48 is located. of the support band 47 which is thus accessible for manual operation even with a glove for adjusting or releasing the support band 47.

The subset of interior fittings 40 is substantially the part of a protective helmet that is in contact with the head. The subset of interior fittings 40 may be attached to the helmet shell 36 to hold and secure the helmet 30 on a user's head. The support cage 42 in the present case is manufactured as an integral plastic molding. The headband 44 is integrally formed in the support cage 42. The neckband 46 has two front ends detachably connected to the rear free ends of the headband 44, for example, by a snap-fit connection which is not shown in detail in the figures. The neck band 46 has two free ends connected together by the adjustment unit 48 in the neck area. The band for neck 46 can be formed of the same material as the support cage 42. The neck band 46 is respectively connected to the support cage 42 between its connections with the headband 44 and its free ends, so that it is adjustable in height as can be seen, for example, in Figure 1. For this purpose, the neck band 46 has three holes 51 arranged one above the other on each side that can be locked on a resilient pin projecting from the support cage 42. In this way, the adjustment unit 48 can be adjusted to different head shapes and put into the most comfortable position with the neck cover 70 on the back of the head.

Next, the adjustment unit 48 will be described in more detail. The adjustment unit 48 forms part, as a hearing protection (not shown), of the helmet accessories shown in Figure 2 which always remain within the perimeter of the helmet shell 36 so that even in the area of the adjustment unit 48 there are no protruding parts present in the helmet 30 in which the obstacles can be trapped when the helmet is used. Figure 2 shows a side view of the subset of interior fittings 40 of the protective helmet 30 in which the two ends of the neck band 46 are connected separable by means of the adjustment unit 48 in the neck area. The adjustment unit 48 is shown in the adjusted state. Figure 3 shows a sectional view of the protective helmet 30 as seen in the backward direction. Figure 4 shows a partially cut-away illustration of the protective helmet 30 according to Figure 3, as seen in the forward direction.

The design and operating principle of the adjustment unit 48 will be described in detail with reference to Figures 5 to 8. Figure 5A shows the adjustment unit 48 in a view from the rear side. Figure 5B shows a sectional view of the adjustment unit 48 along the line VB-VB in Figure 5A. The adjustment unit 48 comprises a neck cover 70 with which a basic body 50 is hinged by means of an interposed transmission lever 80. The adjustment unit 48 comprises an operating element shaped as an adjustment lever. 51 in the embodiment described here. By pivoting the adjustment lever 51 in the clockwise direction of the re-loj, the basic body 50 pivots in relation to the neck cover 70 from a position shown in Figure 5B to a position shown in FIG. Figure 6B.

An axis of the transmission lever 80 connecting the basic body 50 with the neck cover 70 is respective connected with the neck cover 70 at a first end 82 and with the basic body 50 at a second end 84. The transmission lever 80 with an axis is linked to the basic body 50 at a position 62 located in the basic body 50 above a linking point or axis 66 of the adjustment lever 51. The adjustment lever 51 in the area of its attachment point 66 is in the basic body 50 provided with a cam 52 held in the transmission lever 80. If the adjusting lever 51 is moved clockwise from the position shown in Figure 5B in which the adjustment unit 48 is not adjusted towards the adjusted position shown in Figure 6B , the cam 52 exerts a pressure on the second end 84 of the transmission lever 80, whereby the lower end of the basic body 50 is pivoted in the opposite direction of the first end 82 of the transmission lever 80 and in opposite direction. io clockwise, as can be seen in Figure 6B. The linking points 62 and 64 of the transmission lever having a distance si in the unadjusted position of the adjustment unit 48 in Figure 5B, have a substantially greater distance s2 at the adjustment position in Figure 6B. The transmission lever 80 is at its second end 84 provided with a pre-tension spring 86 which drives the first end 82. of the transmission lever 80 against the lower end of the basic body 50 in the direction facing the attachment point 66 of the adjustment lever 51, ie towards the position shown in Figure 5B. From this position, the lower end of the basic body 50 pivots in the opposite direction from the first end 82 of the transmission lever 80 towards the position shown in Figure 6B if the adjustment lever 51 is operated and pivoted from the position that is shows in Figure 5B towards the position shown in Figure 6B. The distance s2 shown in Figure 6B is a consequence solely of the effect of the pre-tension spring 86. The basic body 50 can pivot back to the position shown in Figure 5B without any operation of the adjustment lever 51. if the tension is exerted on the basic body 50 by the neck band 46. If this tensile stress condition according to Figure 5B already exists, the basic body 50 pivots in the opposite direction of the first end 82 of the transmission lever 80 with its lower end when operating the adjustment lever 51 without changing the distance in the process if according to Figure 5. If the neck band 46 does not exert tension on the basic body 50, the basic body 50 pivots by means of a spring element 88 disposed adjacent to the first end 82 of the transmission lever 80 which is it endeavors to pivot the neck cover 70 in the opposite direction of the first end 82 of the transmission lever 80. In the illustrated embodiment, the spring element 88 is shaped as a resilient finger coupled to the neck cover 70. In its place, the resilient finger is preferably and simply integrally formed in the neck cover 70.

According to the illustration in Figure 7, the neck cover 70 comprises at its lower end a fork 72 having resilient arms 72a, 72b which engage in complementary holes (not visible) at the first end 82 of the transmission lever 80 integrally formed by rockers (not visible) and thus forms the point of attachment 62 of the transmission lever 80 in the neck cover 70.

According to the illustration in Figures 6A and 8, the basic body 50 comprises two surfaces 54, 56 on both sides of the adjustment lever 51 which are provided with angular protrusions 54a or 56a which are in positive engagement with holes 47a, 47b on the free ends of the neck band 46. The basic body 50 is respectively provided with a hole 57a, 57b for receiving the free ends of the neck band 46 on both sides between the projections 54a, 56a and the adjustment lever 51, as can be seen in Figure 6A.

The particular advantage of the adjustment unit 48 according to the invention is that the basic body 50 pivots about the second upper end 84 of the transmission lever 80 which is pivotally supported in the neck cover 70 with its first lower end 82. when adjusting and releasing it when operating the adjustment lever 51, such that the most comfortable position occupied by the neck cover 70 on the back of the head after the helmet 30 is placed is not adversely modified. Before the helmet 30 is put on, the free ends of the neck band 46 are inserted into the holes 57a, 57b of the basic body 50, a positive engagement of the holes 47a, 47b is established in the neck band 46 and angles 54a, 56a in the basic body for crudely adjusting the effective length of the support band 47 (measured between the inside of the headband 44 and the front side of the neckcover 70) as a function of of the head size when the helmet 30 is not worn. The adjustment is made properly so that the protective helmet 30 can be conveniently placed when the adjustment unit 48 is not operating. The adjustment of the support band 47 and by thus the neck band 46 after the helmet 30 is placed is then made with the help of the adjustment unit 48 when operating the adjustment lever 51 as described above. The adjustment unit 48 is supported by the neck cover 70 in the neck area at the back of the head in the process. The adjustment position of the adjustment unit 48 is shown in Figure 6. If the adjustment lever 51 pivots counterclockwise and thus opens, the adjustment unit 48 opens. In this way, the lower end of the basic body 50 can be displaced in the direction towards the connecting point 62 of the transmission lever 80 in the neck cover 70 such that the neck band 46 and therefore the support band 47 is disengaged and then the protective helmet 30 can be removed and placed. If the protective helmet 30 is placed, it is only required to pivot the adjusting lever 51 downwards to hold the helmet 30 on the head. This can be done conveniently with one hand and even a gloved hand. The neck cover 70 is covered by a piece of padded material 89 on the front side.

LIST OF NUMBERS 30 protective helmet 36 helmet shell 40 subset of interior accessories 42 support cage 44 head band 46 neck band 47 support band 47th hole 47b hole 48 adjustment unit 50 basic body 51 adjustment lever 52 leva 54 surface 54th outgoing 56 surface 56th outgoing 57th hole 57b hole 62 point of attachment 64 point of attachment 66 point of attachment 70 neck cover 72 hairpin 72nd resilient arm 72b resilient arm 76 cavity 80 transmission lever 82 first extreme 84 second extreme 86 pre-tension spring 88 spring element 89 piece of quilted material if distance s2 distance

Claims

1. An adjustment unit for a support band (47) coupled to the lower edge of the interior fittings (40) of a protective helmet (30) for securing the helmet on the head of a user comprising a headband (44) that it continues in a neck band (46) having two free ends connected together by means of a basic body (50), wherein the adjustment unit (48) comprises an operation element for adjusting the support band (47), characterized in that the adjustment unit (48) comprises a neck cover (70) with which the basic body (50) is articulated, and because the operating element is an adjustment lever (51) linked to the basic body by means of which the basic body (50) pivots with respect to the neck cover (70).

2. The adjustment unit according to claim 1, characterized in that the basic body (50) and the neck cover (70) are connected by a transmission lever (80) linked to the neck cover (70) in a first end (82) and with the basic body (50) at a second end (84).

3. The adjustment unit according to claim 2, characterized in that the transmission lever (80) is linked to the basic body (50) in a position (64) located in the basic body (50) above the point of attachment ( 66) of the adjustment lever (51).

4. The adjustment unit according to claim 3, characterized in that the adjustment lever (51) is provided with a cam (52) supported on the transmission lever (80) in the area of its attachment point (64) in the basic body (50).

5. The adjustment unit according to claim 4, characterized in that the transmission lever (80) at its second end (84) is provided with a pre-tension spring (86) that drives the first end (82) of the transmission lever (80) against one end of the basic body facing the point of attachment (64) of the adjustment lever (51).

6. The adjustment unit according to one of claims 2 to 5, characterized in that a spring element (88) that is forced to pivot the neck cover (70) in the opposite direction of the first end (82) of the transmission lever (80), is disposed adjacent the first end (82) of the transmission lever (80).

7. The adjustment unit according to claim 6, characterized in that the spring element (88) is a resilient finger integrally formed in the neck cover (70).

8. The adjustment unit according to one of claims 2 to 7, characterized in that the neck cover (70) comprises at the point of attachment (66) of the transmission lever (80) a fork (72) having resilient arms (72a, 72b) that are hooked in complementary holes in the first end (82) of the transmission lever (80) with integrally formed rockers.

9. The adjustment unit according to one of the preceding claims, characterized in that the basic body (50) comprises two surfaces (54, 56) having projections (54a, 56a) on both sides of the adjustment lever (51) whose projections they can be put into a positive coupling with complementary holes (47a, 47b) at the free ends of the neck band (46).

10. The adjustment unit according to claim 9, characterized in that the basic body (50) is respectively provided with a hole (57a, 57b) to receive the free ends of the neck band (46) on both sides between the projections ( 54a, 56a) and the adjustment lever (51).