Bumper screw jack
US3941352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Oct 2, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F3/08
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The embodiment of the invention disclosed herein is directed to a lifting jack having an upstanding hollow strut member for rotatably receiving a screw rod therein. The strut member has a flat front wall which forms a glide surface and inwardly turned portions to form a rear glide surface. The inwardly turned portions are spaced apart to provide a longitudinal opening through which extends a slide member secured to a load-lifting support element. The upper end of the screw rod is provided with a non-circular configuration having flat side wall portions and shoulder portions extending therefrom to be inserted into a recess formed in a washer which is to rotate therewith. The washer bears against a pair of thrust disks which are positioned between the upper end of the strut member and the washer. The thrust disks provide multiple thrust bearing surfaces for increased wearability and ease of turning under heavy loads. The lower portion of the screw rod is flattened to prevent unthreading of the screw rod from the load-bearing member. The load-lifting support element has spaced apart sidewall portions on opposite sides of the strut member and a load-bearing front wall portion and a loa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.