التفاصيل البيبلوغرافية
| العنوان: |
Jack with Scale Including Protective Cover |
| Document Number: |
20100108967 |
| تاريخ النشر: |
May 6, 2010 |
| Appl. No: |
12/529874 |
| Application Filed: |
March 06, 2008 |
| مستخلص: |
A simple, inexpensive jack that can be used in severe working environments and can check an amount of raising and lowering movements of a piston of the jack at any time during working. The jack includes a cylinder, a piston capable of raising and lowering movements within the cylinder and a protective cover for covering at least a part of the outer circumference side surface of the cylinder, the protective cover having an inner circumference larger than the outer circumference of the cylinder and having one end fixed adjacent to the top end of the piston via a saddle and the other end being open, and a scale on the outer side surface of the cylinder. The amount of the raising and lowering movements of the piston is indicated by the relationship between the open end of the protective cover and the scale. |
| Inventors: |
Endo, Kenichi (Saitama, JP) |
| Claim: |
1. A jack comprising: a cylinder; a piston capable of raising and lowering movements within the cylinder; a protective cover for covering at least a part of an outer circumferential surface of the cylinder, the protective cover having an inner circumference larger than an outer circumference of the cylinder, an attached end fixed to the piston, and an open end; and a scale on the outer circumferential surface of the cylinder; wherein an amount of the raising and lowering movements of the piston is indicated by the open end of the protective cover and the scale. |
| Claim: |
2. The jack of claim 1, further comprising a saddle fixing the attached end of the protective cover to the piston. |
| Claim: |
3. The jack of claim 1, wherein the protective cover is provided in such a manner that a whole of the piston protruding from the cylinder is covered by the protective cover when the piston moves upward and downward. |
| Claim: |
4. The jack of claim 1, wherein the protective cover is made of a rigid inelastic material. |
| Claim: |
5. The jack of claim 1, wherein the open end of the protective cover is shifted with respect to the scale in response to the raising and lowering movements of the piston so as to indicate an amount of the raising and lowering movements of the piston. |
| Claim: |
6. The jack of claim 1, further comprising graduations on the scale in at least one of an upward direction and a downward direction of the piston. |
| Claim: |
7. The jack of claim 6, further comprising graduations on the scale in both the upward direction and the downward direction of the piston. |
| Claim: |
8. The jack of claim 1, further comprising graduations on the scale including a graduation marking of “0” for a location at which the open end of the protective cover aligns with the scale when the piston is fully lowered. |
| Claim: |
9. The jack of claim 1, further comprising graduations on the scale including a graduation marking of “0” for a location at which the open end of the protective cover aligns with the scale when the piston is fully raised. |
| Claim: |
10. The jack of claim 1, further comprising at least two scales formed on at least two positions of the outer circumferential side surface of the cylinder. |
| Claim: |
11. A jack comprising, a cylinder; a piston capable of raising and lowering movements within said cylinder; a cylindrical protective cover for covering a whole of the piston protruded from said cylinder due to the raising and lowering movements of the piston and a part of an outer circumference side surface of the cylinder, the cylindrical protective cover having an inner diameter larger than an outer diameter of the cylinder; and a scale on the outer circumferential side surface of the cylinder; wherein the cylindrical protective cover has an upper end and a lower end, the upper end being fixed adjacent to the piston via a saddle, the lower end being a cylindrical open end, and the lower end shifts close to the scale in response to the raising and lowering movements of the piston. |
| Claim: |
12. The jack of claim 11, wherein the protective cover is made of a rigid inelastic material. |
| Claim: |
13. The jack of claim 11, further comprising graduations on the scale in at least one of an upward direction and a downward direction of the piston. |
| Claim: |
14. The jack of claim 13, further comprising graduations on the scale in both the upward direction and the downward direction of the piston |
| Claim: |
15. The jack of claim 11, further comprising graduations on the scale including a graduation marking of “0” for a location at which the open end of the protective cover aligns with the scale when the piston is fully lowered. |
| Claim: |
16. The jack of claim 11, further comprising graduations on the scale including a graduation marking of “0” for a location at which the open end of the protective cover aligns with the scale when the piston is fully raised. |
| Claim: |
17. The jack of claim 11, further comprising at least two scales formed on at least two positions of the outer circumferential side surface of the cylinder. |
| Claim: |
18. The jack of claim 11, further comprising a cover for partially covering the cylinder on a base side thereof and wherein an outer circumference of the cover is larger than an outer circumference of the protective cover. |
| Current U.S. Class: |
254/93/R |
| Current International Class: |
66 |
| رقم الانضمام: |
edspap.20100108967 |
| قاعدة البيانات: |
USPTO Patent Applications |