Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1993-02-12
1994-07-19
Olszewski, Robert P.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 24, 104127, B66B 702
Patent
active
053300335
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lift that is formed into a unit based on an idea in which a lift mechanism is attained by rotating a bolt which is in thread engagement so as to raise and/or lower it. This inevitably requires reduction in friction loss at the thread engagement portion. To achieve this, the female and male threading construction is enlarged to proper dimensions without any change in the other factors of the construction, in other words, a thread-like rail is mounted on one of the members, while bearings are mounted on the other member which are arranged in a thread-like fashion to be brought into engagement with the thread-like rail, so that the friction loss between threads can be eliminated. Moreover, not only a rotation stop means but also a power are provided on a lift cage that is to be raised and/or lowered, whereby a portion to be rotated that is connected thereto via thrust bearings is rotated.
PRIOR ART
Conventionally, a sliding device termed as a so-called ball screw has been known. The sliding device has a wide range of applications, such as an XY recorder in a measuring machine, and a feeding device for a machine tool. However, it is more or less impossible to use such a sliding device for a lift device as it is. In other words, the structure comprises a ball and a screw that are in smooth sliding engagement, and a lubricant used to lubricate the engagement is essentially required along the full sliding distance of the screw shaft portion, and therefore even if an expandable bellows are used as a protecting and dust proofing cover for the sliding device, or this is implemented by a solid telescopic cover, it is totally impossible to cover a long device such as a lift. Furthermore, although the shaft is usually rotated to drive the sliding device, deflection resulting from a manufacturing precision constitutes a cause for low rotation speed, and even if a motor is mounted on a nut side member, there is a limit to manufacturing a long shaft side member. The current technology of connecting a plurality of short shaft members to each other .is not accurate enough to produce such a long shaft, and hence no long shaft based upon that technology has been realized. Moreover, as to a method for supporting a lift cage, in order to adopt a two-end support instead of a one-end support, design strategies including synchronization of rotation are required. However, this serves only to complicate the structure and make it difficult to realize an ideal device.
DISCLOSURE OF THE INVENTION
The present invention provides a lift device characterized in that a large diameter cylinder properly dimensioned in terms of the rotation strength and load rigidity of bearings used is provided as an outer shell, that shielded bearings are mounted in such a manner that they are arranged along the inner surface of the outer shell in a female thread like fashion with a proper thread pitch, that a short cylinder is telescopically inserted within the shielded bearings with a proper gap provided therebetween, and that a male thread-like strap-like rail is wound around the outer circumference of the short cylinder with the same thread pitch as that of the shielded bearings so that the strap-like rail screw-fits into the root portion of the female threads of the large diameter cylinder as an outer shell, whereby a male and female thread engagement state is established so that the inner short cylinder is rotated to be raised and/or lowered, a driving motor being mounted on the lift cage so as to be integrated therewith, the integrated body being coupled to the short cylinder constituting a portion to be rotated via bearings, and side iron plates being provided on the lift cage side to prevent not only the rotation thereof but also the rolling of the portion to be rotated, so that they are brought into engagement with the bearings that are arranged in a thread-like fashion by making use of the bearings again, whereby the smoothness required for rotational, vertical motion is attained. Thus, the
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Olszewski Robert P.
Reichard Dean A.
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