1. A vehicle transporter comprising:
(a) a vehicular frame;
(b) a vehicle support member movable relative to said vehicular frame; and
(c) a screw actuator having elongate members connected to said vehicular frame and said vehicle support member and slidable longitudinally in a partially coextensive relationship to each other to vary a length of a portion of one member that is coextensive longitudinally with a portion of another member and thereby cause said vehicle support member to move relative to said vehicular frame, said screw actuator having a longitudinally extending rotatable screw whose rotation forces said elongate members to slide longitudinally relative to each other.
2. The vehicle transporter of claim 1 wherein said screw actuator further comprises a motor including a frame connected to an elongate member and a shaft rotatable in said frame and drivingly connected to rotate said screw.
3. The vehicle transporter of claim 1 wherein said screw comprises a screw thread that is self-locking to prevent forces tending to slide said members relative to each other from rotating said screw.
4. The vehicle transporter of claim 1 wherein said screw comprises an Acme screw thread having a lead angle not exceeding five degrees.
5. The vehicle transporter of claim 1 wherein said connections of said screw actuator to said vehicular frame and to said vehicle support member are pivotable connections.
6. The vehicle transporter of claim 5 wherein said screw actuator further comprises a motor including a frame connected to an elongate member enabling said motor and said elongate member to pivot in unison and a shaft rotatable in said frame and drivingly connected to rotate said screw.
7. The vehicle transporter of claim 5 wherein said motor shaft is rotatable on a common axis with said screw.
8. The vehicle transporter of claim 1 wherein said vehicle support member is pivotally connected to said frame at a location distal of said connection to said screw actuator and relative movement of said elongate members causes said vehicle support member to pivot relative to said frame.
9. A screw actuator comprising:
(a) a tubular shell connectible to a first member; said tubular shell comprising a wall defining an exterior and an interior;
(b) a slide tube comprising a slide tube wall defining a slide tube interior and a slide tube exterior, said slide tube exterior being slidably arranged in said interior of said tubular shell, said slide tube connectible to a second member;
(c) a screw arranged for rotation in said interior of said tubular shell and including a threaded portion;
(d) a nut in threaded engagement with said threaded portion of said screw and constrained to said slide tube so that rotation of said screw will cause said slide tube to translate in said tubular shell altering a length of said screw actuator; and
(e) a guide constraining radial movement of said screw in said slide tube interior.
10. The screw actuator of claim 9 further comprising a follower nut in threaded engagement with said screw and spaced apart from said nut.
11. The screw actuator of claim 10 further comprising an indicator of contact between said follower nut and at least one of said nut and said slide tube.
12. The screw actuator of claim 9 further comprising a motor including a frame connected to said tubular shell and a shaft rotatable in said frame and drivingly connected to rotate said screw.
13. The vehicle transporter of claim 12 wherein said motor shaft is rotatable on a common axis with said screw.
14. The screw actuator of claim 9 wherein said threaded portion of said screw is arranged so that a force tending to displace said slide tube will not cause rotation of said screw.
15. The screw actuator of claim 9 wherein said threaded portion of said screw comprises an Acme thread having a lead angle not exceeding five degrees.
16. The screw actuator of claim 9 wherein at least one of said tubular shell and said slide tube is pivotally connectible, respectively, to one of said first member and said second member.
17. A screw actuator comprising:
(a) an elongate tubular first member;
(b) an elongate tubular second member slidable longitudinally in an interior of said tubular first member to vary a length of a portion of said second member longitudinally coextensive with said first member; and
(c) a screw rotatably supported by said first member and radially constrained in an interior of said tubular second member, rotation of said screw forcing said first and said second members to slide longitudinally relative to each other.
18. The screw actuator of claim 17 further comprising a motor including a frame connected to said first member and a shaft rotatable in said frame and drivingly connected to rotate said screw.
19. The screw actuator of claim 18 wherein said motor shaft is rotatable on a common axis with said screw.
20. The screw actuator of claim 17 wherein said screw comprises a threaded portion arranged so that a force tending to slide said members relative to each other will not cause rotation of said screw.
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 compound represented by the general formula (1),
(Yq)n-m-M\u2514Xp-Rp-SH\ue8a0m\u2003\u2003(1)
wherein, in the formula, M represents an Sn atom, an Si atom, a Zr atom, a Ti atom or a Ge atom; Rp each independently represents a divalent organic group; Xp each independently represents a sulfur atom or an oxygen atom; Yq each independently represents a monovalent inorganic or organic group; m represents an integer of 2 to n; n represents a valency of a metal atom M; and when m is not less than 2, -(-Xp-Rp-SH) may be bonded to one another for forming a group of a ring structure.
2. The compound as set forth in claim 1, wherein when m is not less than 2, -(-Xp-Rp-SH) is bonded to one another for forming a group of a ring structure.
3. The compound as set forth in claim 1, wherein at least one of Rp contains a S atom.
4. A polythiol composition comprising the compound as set forth in claim 1.
5. A polymerizable composition comprising the compound as set forth in claim 1.
6. A polymerizable composition comprising the polythiol composition as set forth in claim 4.
7. A resin obtained by polymerization of the polymerizable composition as set froth in claim 5.
8. A resin obtained by reacting and curing the compound as set forth in claim 1 with a polyisocyanate compound.
9. A resin obtained by reacting and curing the polythiol composition as set forth in claim 4 with a polyisocyanate compound.