US794262A

US794262A - Pneumatic lifting-jack.

Info

Publication number: US794262A
Application number: US24528005A
Authority: US
Inventors: Frank E Ten Eyck
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-02-11
Filing date: 1905-02-11
Publication date: 1905-07-11
Anticipated expiration: 1922-07-11

Description

No. 794,262. PATENTED JULY l1, 1905.

F. E. TEN EYCK.

PNEUMATIG ILIJFTING JACK.

APPLIGATION FILED 11B. 11. 1905.

2 SHEETS-SHEET 1.

Inventur: l

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No. 794,262. PATENTED JULY 11, 1905. F. E. TEN EYCK.

PNBUMATIC LIPTNG JACK. APPLICATION FILED FEB. 1'1. 1905.

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Patented July 11, 1905.

Barnum @erica FRANK E. TEN EYCK, OF AUBURN, NEW YORK.

PNEUMATHC LIFTING-JACK SPECIFICATION forming part of Letters Patent No. 794,262, dated July 11, 1905.

Application tiled February 1l, 1905. Serial No. 245,280.

Be it known that .1. FRANK E. TEN EYCK, a citizen ot' the United States, residing at A uburn, in the county of Cayuga and State of New York, have invented certain new and use't'ul ,Improvements in YPneumatic Lifting Jacks, of which the `following is a Vt'ull and cxact description.

My invention relates to that class of jacks operated by air or lid uid compression, and has for its object the production ol a lifting-jack that will comprise in a small and compact body great power and ease of operation and adjustment.

ln 'the drawings, Figure l is an elevation showing the jack closed. Fig. 2 is a section and part elevation on the line m :y of Fig. 1. Fig. 3 is a detail section on the line Y Y otl Fig. 1. Fig. 4 is a section and part elevation showing the operative parts raised. Fig. 5 is a detail section. Fig. 6 is a detail section on the line 3 3 oli Fig. 5, and Fig. 7 is a diagrammatic detail.

A is a cylindrical casing secured to a base B and a cap C.

D isahollowpiston-rod secured at its lower end to a piston E. The piston E is composed ot plates (l, and a. holding between them a disk made of leather or other flexible and suitable material, the edge of the disk being bent as shown and litting snugly against the inner circumference olE the cylinder A. A Afiat spring is employed to preserve the proper engagement of the disk with the side ot' the cylinder. The peripheral laces otl the disks a a' are ot considerable breadth in order to add to the stability otl the jack and to minimixe any tendency otl the parts to lateral movement when in a raised position.

rithin the hollow piston-rod D is a supporting-bar F, having attached to its upper end a bracket Gr, upon which will rest the ob- -iect to be raised. A spring-controlled dog 0 is pivotcd between lugs upon the hollow piston-rod If) and engages with rack-teeth a on a side of the supporting-bar F to hold the latter in any desired elevated position.

On a side of the piston-rod D is ai-ack-bar C', having inverted teeth 0'. r[he rack-bar C may be integral with the piston-rod l) or it may be made separately and attached thereto in any suitable manner. A dog is pivoted in lugs upon the cap C and is normally out ot' engagement with the rack-teeth o'. The face e2 of the dog is so shaped that but a minimum ot' its surface ever engages with a face of any of the teeth c' when in contact, as shown in Fig. 7. Consequently while the dog (il will hold the piston-rod l) securely when in use and the piston rod is raised but a small amount of pressure is required to release the dog and allow the piston-rod to descend.

Air is forced into cylinder' A and beneath the piston E through a tube e. connected to an inlet e in the base B. The end ot' the tube e attached to the source of air-supply is provided with an ordinary bicycle-valvef. An air-passagef leads from the inlet e' through the base B and opens into the cylinder A beneath the piston E. At (l the air-passage j is enlarged to accommodate a valve r/ ot' similar construction and operation to the valve f, except that the valve-stem /L projects above the casing. lt occasionally happens that the washer /t in the valve f/ when the valve is opened to exhaust air in the cylinder by pressing on the valve-stem /t will stick to the valve-seat and so prevent the passage of air. lo overcome this dilliculty, l cut away the valve-stem as shown, so that when the valve-stem /t is pressed down to exhaust air vfrom the cylinder A and the washer should stick against the valve-seat there will be a sut'- licient space between the edge ot' the opening in the Washer and the cut-away part of the stem /i vto permit the air to readily escape.

Then it is desired to use the jack, it is first placed beneath the object to be moved. The supporti ngbar F is raised to the desired height by hand or until the bracket Gr contacts with the object and is so held by the dog c engaging with one ofthe teeth a. Air is then pumped through the tube e and the passage f into the cylinder A beneath the piston E, raising the latter and the piston-rod fl), carrying with them the supportingfbar F and the bracket Gr and raising the object with whichthe latter is in contact. flien the desired. height has been reached,the pumping is stopped and the weight of the object raised is sustained by the cushion of air beneath the piston E. If at any time, however, leakage or other causes should tend to lessen the air in the cylinder, so that the piston will descend and lower the object raised `below the desired position, the dog Z is tilted into contactwith the. face of the nearest of the .inverted teeth on the piston-rod, and any further downward movement is at once checked. When the object raised is to be lowered and the dog d is in engagement with the rack-bar C', the dog d is released, and a pressure of the foot or hand upon the valve-stein L will open the valve, allowing the air in the cylinder A to exhaust and the piston G to descend to its lirst position. rIhe jack can then be removed from beneath the object with which it has been used, and by disengaging the dog c from thc teeth a on the supporting-bar Fthe latter will drop back to its normal place in the pistonrod D.

It will be observed that the slow exhaustion of the air .from the cylinder A because of the small size of the air-passage f permits a slow descent of the piston and connected parts that sustain the object raised, preventing all jar or shock caused by a sudden release of the air in large volume. I

The supporting-bar F can be removed entirely from the piston-rod I), and the latter can be used as a supporting-bar, the top being suflciently broad and strong to support the object to be raised.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A lifting-jack having a rack-bar with inverted teeth, and means to contact with the face of the teeth to hold the rack-bar when the latter is raised.

2. Alifting-jack having a rack-bar with inverted teeth, and a dog to contact with the face of the teeth to hold the rack-bar when the latter is raised.

3. A lifting-jack having a rack-bar with inverted teeth, and a dog to engage therewith, the face of the dog shaped to present a minimum of its surface to engage with the face of the teeth on the rack-bar.

4. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, and a piston-rod having a series of rack-teeth.

5. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, and a hollow piston-rod having a series of rack-teeth.

6. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, a piston-rod havingaseries of rack-teeth, and means to contact with the rack-teeth to hold the piston-rod in a raised position.

7. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, a piston-rod havinga series of rack-teeth, and a' dog to contact with the rack-teeth to hold the piston-rod in a raised position.

8. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, a piston-rod having va series of inverted rackteeth,and a dog to contact with the face of said teeth to hold the piston-rod in a raised position.

9. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder` a hollow piston-rod having aseries of inverted rack-teeth, and a dog to contact with the face of said teeth to hold the piston in araised position.

10. In a pneumatic lifting-jack, the combination of a cylinder, a piston in the cylinder, a piston-rod having a series of inverted rackteeth, a dog to contact with the face of said teeth, the face of the dog shaped to engage a minimum of its surface with the face of the rack-teeth.

11. A pneumatic lifting-jack having in combination a cylinder, a piston in the cylinder, a hollow piston-rod, rack-teeth on the pistonrod, a supporting-bar in the piston-rod, teeth on the supporting-bar, and a dog on the piston-rod to engage the teeth on the supportingbar.

12. A pneumatic lifting-jack having in combination a cylinder, a piston in the cylinder, a hollow piston-rod having a series of rackteeth, a supporting-bar in the piston-rod, teeth on the supporting-bar, and means to engage with the teeth on the piston-rod and the teeth on the supporting-har to hold the piston-rod and the supporting-bar in a raised position.

13. A pneumatic lifting-jack having in combination a cylinder, a piston in the cylinder, a hollow piston-rod having a series of rackteeth, a vertically-adjustable supporting-bar in the piston-rod, teeth on the supporting-bar, a dog on the cylinder to contact with the teeth on the piston-rod, and a dog on the piston-rod to engage with the teeth on the supportingbar.

14. Apneumatic lifting-jack having in combination a cylinder, a piston in the cylinder, a hollow piston-rod having a series of inverted rack-teeth, a vertically-ad justable supportingbar in the piston-rod, teeth on the supportingbar, a dog on the cylinder to contact with the face of the teeth on the piston-rod, and a dog on thc piston-rod to engage the teeth on the supporting-bar.

l5. A lifting-jack having in combination a cylinder, a base therefor, a piston in the cylinder, a hollow piston-rod having inverted rack teeth, a cap on the cylinder through which the piston-rod moves, a vertically-adjustable supporting-har having rack-teeth, a dog on the piston-rod to engage said teeth,

IOO

IZO

and a dog on the cap to engage with the teeth In testimony whereof I hereunto set my on the piston-rod. hand, this 6th day of February, 1905, in the 16. Apneumaticlifting-jaok having in oompresonce of two attesting witnesses. birmtion a cylinder, a piston in the cylinder, FRANK E. TEN EYCK. 5 a. hollow piston-rod having it series of raok- Witnesses:

teeth, a supportngbnr in the piston-rod, and WM. CHAUNCEY GATES,

a supporting-bracket on the supporting-bar. D. L. TULLER.