Scissor jacks

Patent metadata

Field	Value
Publication number	US-10793405-B2
Application number	US-201916242490-A
Country	US
Kind code	B2
Filing date	Jan 8, 2019
Priority date	Jan 15, 2018
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A scissor jack comprises a bracket coupled to a first upper arm and a second upper arm; a load rest positioned above the bracket and pivotally connected to the bracket; an elastic element disposed between the load rest and the bracket; a base coupled to a first lower arm and a second lower arm; a first connector pivotally connected to the first upper arm and the first lower arm; a second connector pivotally connected to the second upper arm and the second lower arm; and a driving rod drivably connected to the first and second connectors.

First claim

The invention claimed is:

1. A scissor jack, comprising:
a bracket pivotally connected to a first upper arm and a second upper arm;
a load rest positioned above the bracket and pivotally connected to the bracket via a pivot pin;
an elastic element disposed between the load rest and the bracket;
a base coupled to a first lower arm and a second lower arm;
a first connector pivotally connected to the first upper arm and the first lower arm;
a second connector pivotally connected to the second upper arm and the second lower arm; and
a driving rod drivably connected to the first and second connectors.

2. The scissor jack of claim 1 , wherein a lengthwise direction of the pivot pin is substantially perpendicular to a lengthwise direction of the driving rod.

3. The scissor jack of claim 1 , wherein each of two sidewalls of the load rest has a through hole, each of two sidewalls of the bracket has a first connecting hole, the pivot pin passes through the through holes and the first connecting holes such that the load rest is pivotable via the pivot pin relative to the bracket.

4. The scissor jack of claim 3 , further comprising a damping ring disposed between the pivot pin and the first connecting hole.

5. The scissor jack of claim 3 , wherein each of the two sidewalls of the bracket includes a second connecting hole and a third connecting hole, the first connecting hole is disposed between the second and third connecting holes at a lengthwise direction of the driving rod, wherein the bracket is pivotally connected to the first and second upper arms via a first support rivet positioned in the second connecting hole and a second support rivet positioned in the third connecting hole, respectively.

6. The scissor jack of claim 1 , wherein a lengthwise direction of the elastic element is substantially perpendicular to a lengthwise direction of the pivot pin.

7. The scissor jack of claim 6 , wherein the elastic element includes two elastic members and the pivot pin is between the two elastic members at a lengthwise direction of the driving rod.

8. The scissor jack of claim 6 , wherein the elastic element is configured to bias the load rest toward an unloaded position, and a support plane of the load rest is substantially parallel to the driving rod at the unloaded position.

9. The scissor jack of claim 8 , wherein a lower surface of the load rest includes a first groove to receive a first end of the elastic element, and a top surface of the bracket includes a second groove to receive a second end of the elastic element, and the elastic element is connected to the load rest and the bracket.

10. The scissor jack of claim 6 , wherein the elastic element is a coil spring.

11. The scissor jack of claim 10 , wherein the coil spring has an elastic coefficient in a range of 2.5 to 4.5 kN/mm.

12. The scissor jack of claim 6 , wherein the elastic element is a rubber rod.

13. The scissor jack of claim 1 , wherein the base is pivotally connected to the first lower arm via a first base rivet and pivotally connected to the second lower arm via a second base rivet.

14. A scissor jack, comprising:
a pair of upper arms;
a driving rod at least partially positioned between the pair of upper arms;
a support including:
a bracket pivotally connected to the pair of upper arms,
a load rest disposed above the bracket to hold an object, wherein the load rest is pivotally connected to the bracket via a pivot pin and pivoted around the pivot pin to at least partially offset a lateral force applied by the object, and
an elastic element, wherein the elastic element is connected between the bracket and the load rest and configured to bias the load rest toward an unloaded position, and wherein the load rest has a support plane, the support plane is substantially parallel the driving rod at the unloaded position and contacts the object at least partially at a loaded position.

15. The scissor jack of claim 14 , wherein the bracket has two sidewalls substantially perpendicular to the support plane of the load rest, each of the sidewalls include a first connecting hole, a second connecting hole and a third connecting hole, the second and third connecting holes are positioned at left and right sides of the first connecting hole, respectively and wherein the bracket is pivotally connected to the first and second upper arms respectively via a first support rivet in the second connecting hole and a second support rivet in the third connecting hole.

16. The scissor jack of claim 14 , further comprising a pair of lower arms and a base pivotally connected to the pair of lower arms.

17. A support of a scissor jack, comprising:
a bracket including sidewalls pivotally connected to a pair of upper arms of the scissor jack;
a load rest, wherein the load rest is positioned above the bracket, includes a main body to support an object and sidewalls extending down from the main body, wherein the sidewalls of the load rest is pivotally connected to the sidewalls of the bracket via a pivot pin, and a lengthwise direct of the pivot pin is substantially parallel to a pivot axis around which the bracket pivotable to the upper arms; and
an elastic element, wherein one end of the elastic element is connected to a lower surface of the main body of the load rest, and another end is connected to a top surface of the bracket.

18. The support of claim 17 , wherein the elastic element is configured to counteract a pivotal movement of the load rest.

19. The support of claim 17 , wherein the elastic element is positioned above and to one side of the pivot pin.

20. The support of claim 17 , wherein the pivot pin is positioned between a center area of the main body of the load rest, the elastic element includes two elastic members, the two elastic members are positioned on opposite sides of the pivot pin at a lengthwise direction of a driving rod.

Assignees

• Ford Global Tech Llc

Inventors

• Tao Michael
• Liu Brenna
• Zhou Han
• Xu Zhuang
• Ge Wendy

Classifications

• B66F3/12 Primary

  comprising toggle levers (lazy-tongs mechanisms B66F3/22) · CPC title

• B66F7/28

  Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions · CPC title

• B66F2700/09

  Other lifting devices · CPC title