1. An electrical contact assembly, comprising:
a slanted electrical terminal;
a push button; and
a contact member disposed between the electrical terminal and the push button,
the contact member comprising:
a first portion forming a first angle in relation to a surface of the electrical terminal; and
a second portion, connected to the first portion, and forming a second angle in relation to the surface of the electrical terminal,
wherein the second angle is unequal to the first angle,
such that the second portion is adapted to make contact with, and slide on the surface of the electrical terminal as the push button is pushed against the contact member,
wherein the second portion is substantially parallel to the electrical terminal when in contact.
2. The electrical contact assembly of claim 1, further comprising a spring member coupled with a portion of the push button and a bottom portion of a cover to normally maintain the contact member away from the electrical terminal.
3. The electrical contact assembly of claim 1, further comprising a housing and a cover together substantially enclosing the electrical terminal and the contact member.
4. The electrical contact assembly of claim 1, further comprising a retainer adapted for retaining an electrical wire, wherein the retainer is in electrical contact with the electrical terminal.
5. The electrical contact assembly of claim 1, wherein:
the electrical terminal has an essentially planar surface, the first portion of the contact member is transverse in relation to said surface of the electrical terminal and the second portion is transverse in relation to said surface of the electrical terminal, such that the second angle is less than the first angle.
6. The electrical contact assembly of claim 1, wherein the contact member comprises beryllium copper.
7. The electrical contact assembly of claim 1, wherein the second portion is adapted to wipe a portion of the surface of the electrical terminal when sliding on said surface.
8. The electrical contact assembly of claim 1, wherein the contact member further comprises:
a third portion and a fourth portion symmetrical in configuration to the first portion and the second portion, respectively; and
a top portion connecting the first and the third portions, forming an essentially U-shaped contact member.
9. The electrical contact assembly of claim 1, further comprising a spring member coupled to the contact member and to the push button, wherein an opening is defined in the top portion of the contact member to axially receive an extrusion of the push button therethrough extending through a portion of the spring member as the push button is urged against the contact member.
10. The electrical contact assembly of claim 1, wherein the contact member is adapted to provide a resistive mechanical force between the push button and the electrical terminal when in electrical contact with the electrical terminal, the resistive force at least partially resulting from a change in a relative angle between the first portion and the second portion as the push button is urged against the contact member.
11. The electrical contact assembly of claim 10, wherein the relative angle between the first portion and the second portion is about 130\xb0 when the contact member is not in electrical contact with the electrical terminal.
12. The electrical contact assembly of claim 1, wherein the first angle is between about 20\xb0 and 90\xb0.
13. The electrical contact assembly of claim 12, wherein the first angle is about 75\xb0.
14. The electrical contact assembly of claim 12, wherein the second angle is about 25\xb0.
15. An apparatus, comprising:
a plurality of slanted electrical terminals;
a switch for making an electrical connection between at least two of the plurality of electrical terminals, wherein the switch comprises:
a push button; and
an essentially U-shaped contact member disposed between the electrical terminals and the push button, and adapted to provide an electrical connection between a first terminal and a second terminal when the push button is urged against the contact member to bring the contact member in electrical contact with the first and second electrical terminals to electrically close the switch, the contact member comprising:
a first element forming a first transverse angle in relation to a surface of the first electrical terminal; and
a second element forming a second transverse angle in relation to a surface of the second electrical terminal;
such that at least a portion of the first element is adapted to make contact with and slide on the surface of the first electrical terminal as the push button is urged against the contact member, and at least a portion of the second element is adapted to make contact with and slide on the surface of the second electrical terminal as the push button is urged against the contact member,
whereby the contact member provides an electrical connection between the first and second electrical terminals,
wherein all of a flat surface of the first element is coupled with the first electrical terminal when the push button is depressed.
16. The apparatus of claim 15, wherein the contact member is adapted to reversibly deform as the push button is urged against the contact member, to allow a change in the first angle that enables a tip portion of the first element to slide on the surface of the first electrical terminal, and to allow a change in the second angle that enables a tip portion of the second element to slide on the surface of the second electrical terminal.
17. The apparatus of claim 16, wherein:
the contact member further comprises a top element connecting the first and second elements;
the first element includes a mid portion connecting the tip portion of the first element to the top element, the mid portion of the first element forming a third transverse angle in relation to the tip portion of the first element, the second element includes a mid portion connecting the tip portion of the second element to the top element, the mid portion of the second element forming a fourth transverse angle in relation to the tip portion of the second element.
18. The apparatus of claim 17, further comprising a spring member disposed between at least a portion of the contact member and the terminals to normally maintain the contact member away from the electrical terminals to electrically open the switch.
19. The apparatus of claim 18, wherein the spring member provides a counter force to disconnect the contact member from the first and second electrical terminals when the push button is not urged against the contact member, thereby transitioning the switch from electrically closed to electrically open.
20. The apparatus of claim 19 further comprising a housing and a cover together substantially enclosing the electrical terminals and the contact member, the housing forming an opening that slidably retains at least a portion of the push button, such that a top portion of the push button is exposed outside the housing to allow urging the push button against the contact member to electrically close the switch.
21. An electrical system, comprising:
a plurality of electrical terminals; and
a switch for making an electrical connection between at least two of the plurality of electrical terminals, wherein the switch comprises:
a push button; and
a contact member disposed between the electrical terminals and the push button, and adapted to provide an electrical connection between a first terminal and a second terminal when the push button is urged against the contact member to bring the contact member in electrical contact with the first and second electrical terminals,
the contact member comprising:
a first element forming a first transverse angle in relation to a surface of the first electrical terminal;
a second element, connected to the first element, and forming a second transverse angle in relation to the surface of the first electrical terminal; and
a third element connected to the first element;
such that the second element is adapted to make contact with, and slide on the surface of the first electrical terminal as the push button is urged against the contact member, and
the third element is adapted to make contact with the second electrical terminal as the push button is urged against the contact member, whereby the contact member provides an electrical connection between the first and second electrical terminals,
wherein all of a flat surface of the second element is coupled with the first electrical terminal when the push button is depressed.
22. The electrical system of claim 21, wherein the second element is adapted to wipe a portion of the surface of the first electrical terminal when sliding on the surface.
23. The electrical system of claim 21, wherein the contact member is adapted to provide a resistive mechanical force against the push button when in electrical contact with the first electrical terminal and the second electrical terminal, the resistive force resulting from a change in a relative angle between the first element and the second element.
24. The electrical system of claim 21, wherein the switch further comprises a spring member disposed between a portion of the contact member and terminals, for providing a counter spring force to disconnect the contact member from the first electrical terminal and the second electrical terminal when the push button is not urged against the contact member.
25. The electrical system of claim 21, further comprising a spring member to normally maintain the contact member away from the electrical terminals.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sweeper roller for film production having a spirally grooved surface, the proportion of the area of the spirally grooved part to the surface area of the sweeper roller being 30% or less, and the width of the spiral groove measured in the axis direction of the sweeper roller being 25 mm or more.
2. A sweeper roller for film production as described in claim 1 wherein the spiral grooves are separated on the surface of the sweeper roller at intervals of 100 mm or less in the rotation direction of the sweeper roller.
3. A sweeper roller for film production as described in claim 1 wherein the spiral grooves make an angle of 40\xb0 or more and less than 90\xb0 to the rotation direction of the sweeper roller.
4. A sweeper roller for film production as described in claim 1 wherein a plurality of spiral grooves exist in the surface of a sweeper roller with no crossings among the spiral grooves.
5. A plastic film production apparatus comprising a T-die, a cooling roller, and a sweeper roller, the sweeper roller being a sweeper roller for film production as described in claim 1.
6. A plastic film production apparatus as described in claim 5, wherein the surface of the sweeper roller has a plurality of spiral grooves aligned at regular intervals, and the distance M expressed by equation (1) through which the spiral grooves provided in the surface of the sweeper roller move in the axis direction relative to the cooling roller as the cooling roller makes one revolution is not less than the width of the spiral grooves measured in the axis direction of the sweeper roller and not more than the width of the ungrooved parts measured in the axis direction of the sweeper roller:
M={(Dc\xd7N) mod Ds}Ds\xd7Pc\u2003\u2003equation (1)
where M: distance through which the grooves move in the axis direction as the cooling roller makes one revolution,
Dc: outside diameter of the cooling roller,
Ds: outside diameter of the sweeper roller,
N: number of spiral grooves provided in the sweeper roller,
Pc: pitch of the spiral grooves in the axis direction, equal to LN,
L: lead of the spiral groove.
7. A plastic film production method comprising the steps of discharging molten resin from a T-die and bringing the molten resin into contact with a cooling roller so that it is cooled and solidified to form plastic film, the molten resin or the cooled and solidified plastic film being brought into contact with a sweeper roller during the period in which the molten resin and the cooling roller are in contact with each other, the sweeper roller being a sweeper roller for film production as described in claim 1.
8. A plastic film production method as described in claim 7, wherein the surface of the sweeper roller have a plurality of spiral grooves aligned at regular intervals, and the distance M expressed by equation (1) given below through which the spiral grooves provided in the surface of the sweeper roller move in the axis direction relative to the cooling roller as the cooling roller makes one revolution is not less than the width of the spiral grooves measured in the axis direction of the sweeper roller and not more than the width of the ungrooved parts measured in the axis direction of the sweeper roller:
M={(Dc\xd7N) mod Ds}Ds\xd7Pc\u2003\u2003equation (1)
where M: distance through which the grooves move in the axis direction as the cooling roller makes one revolution,
Dc: outside diameter of the cooling roller,
Ds: outside diameter of the sweeper roller,
N: number of spiral grooves provided in the sweeper roller,
Pc: pitch of the spiral grooves in the axis direction, equal to LN,
L: lead of the spiral grooves.