US1295469A

US1295469A - Lifting-jack.

Info

Publication number: US1295469A
Application number: US25544718A
Authority: US
Inventors: William H Firebaugh Jr
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-09-24
Filing date: 1918-09-24
Publication date: 1919-02-25
Anticipated expiration: 1936-02-25

Description

W. H. FIREBA'UGH, JR.

Patented Feb. 25, 1919.

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W. H. FIREBAUGH, JR.

unme JACK. APPLICATION FILED SEPT. 24, I918.

Patented Feb. 25, 1919.

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APPLICATION FILED SEPT. 24, 1918. 3,295,469, Patented Feb. 25, 1919.

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,4 TTORNEKS' wnalecl on an eccentric of the gear 6 and the nut WILLIAM'I-I. FIBEBAUGH, JR, 0F BERKELEY, CALIFORNIA.

LIFTING-JACK.

Specification of Letters Patent.

. Patented Feb. 25, 1919.

Application filed September 24, 1918. Serial No. 255,447.

To all whom it may concern:

Be it known that 1, WILLIAM H. FIRE- BAUGH, Jr., citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Lifting- Jacks, of which the following is a specification.

This invention relates to a lifting jack and particularly to improvements on the structure shown in my co pending application, Serial No. 231,801, entitled Jack, filed May 1, 1918.

O c of, he objects of the present invention is to provide a lifting jack for automobiles, trucks and the like, which comprises a pedestal, a lifting screw, a nut for raising or lowering the screw, and means for rotating the nut.

Another object of the invention is to provide manually operated means for'transmitting power to rotate the nut and particularly to provide an intermediate mechanism for transmitting a reverse movement to the nut.

Further objects will hereinafter appear.

The invention. consists of the parts and the construction, combination and arrangement of parts as will hereinafter be more fully described and claimed, having reference to the accompanying drawings in which I Figure 1 is a side elevationof the jack partly in section. v

Fig. 2 is a side elevation taken at right angles to Fig. 1.

Fig. 3 is a plan section on line 3-3, Fig. 1.

-Referring to the drawings in detail, A indicates a pedestal, on the upper end of which is formed a vertical bearing extension 2. Extending through the pedestal and the bearing extension 2 is a central passage for the reception of a lifting screw 4. The screw 1 is carried by a nut 5 which is sup ported by the bearing extension 2 and turnable thereon. Formed on the lower end of the nut is a bevel gear 6 and adapted to intermesh with said gear'is a driving pinion such as shown at 7 This pinion is jour- 8 which is turnably mounted on a stud shaft 9, secured in the pedestal as shown. Also secured in the pedestal is a second stud shaft 10 on'which' 1s Journaled a bevel gear 11. This gear remains in consta t mesh with the gear 6 and it is employed for reversing the movement 5 carried thereby.

19 carried by a otally mounted as shown at 21, on a pm I spring is utilized be lifted in a vertical direct1on.

Formed integral with the beveled pinion 7 1s a ratchet gear 12, and journaled on the eccentric 8 is a pulley 13, about which is wound a flexible cord 14:. One end of the cord is secured to the periphery of the pulley in any suitable manner while the opposite end is provided with a handle 15. Formed on one end ofthe eccentric is an annular flange 16 and secured to said flange is a drum 17 which is surrounded by a coil spring 18. The inner end of the spring is secured to the drum 17 while the opposite or free end of the spring is secured to a pin pawl 20. This pawl is pivwhich is secured on the inner face of the pulley. The spring is thus attached to the pulley and a partial tension is thus imparted to the spring when the cord is unwound by a pull exerted onthe cord by means of a handle. 15. This tension imparted to the for the purpose of reversing the movement of the pulley so that the cord maybe rewound thereon after each successive pull exerted on the cord. The tension of the springis also imparted for the purpose of maintaining the pawl 20 in constant engagement with the ratchet gear 12 and as this gear, together with the bevel pinion v7, 1s loosely turnable on the eccentric sleeve, it can readily be seen that means have been provided for turning said gears in unison with the pulley in one direction and that they will remain stationary when thepulley is reversed by the pull of thespring and while the cord 1 1 is being rewound.

A pull exerted on the cord, as previously described, turns the pulley in the direction of arrow (1, see Fig. This movement of the pulley is transmitted through the pawl, to revolve the gears 7 and 12 in the same direction and as the gear 7 is normally in mesh with the gear 6, it can readily be seen that turning movement will be transmitted to the nut 5, which will cause the screw 4 to Reverse movement of the pulley caused by the pull of the spring 18 permits the gears to remain stationary whilethe cordfisrewound and it can therefore be seen that an intermittent revolving movement is 5 in one direction to lift tically.

If it is the screw 4: vertransmitted to the nut obvious that it is necessary to reverse the movement of the nut 5.

Means have been provided for this end of the'quad purpose and the operation of the mechanism applied will be as follows: Secured to the annular flange 16 and the drum 17 carried thereby, is a downwardly extending lever 25. Formed on the lower end of said lever is a handle 26 and formed .on the. opposite side of the lever is a project mg pin 27 Secured to the base of the pedestal, or formed integral therewith, is a quadrant 28 and formed on the quadrant is a pair of

notches

29 and 29*, positioned one at each lever 25 is secured at other of the quadrant by the pin 27 engaging the notches described. Engagement of the lever with the notch 29 secures the eccentricS in a position where the pinion 7 will intermesh with the gear 6 and remain out of mesh with the intermediate gear 11. This position is maintained while the screw 4: is being raised vertically. If, however, it is desired to reverse the movement of the screw, it is only necessary for the operator to swing the lever from the full line position shown in Fig. 2, to the dotted line position shown at 25, where the pin will engage the notch 29. This movement of the lever turns the eccentric to one side, thus swinging the pinion 7 awa I from the gear 6 and into mesh with the intermediate gear 11. An alternate pull on the cord 14: will thus transmit power through the gears 7 and 11 to the gear 6 and in this manner reverse the turning movement of the nut 5 and cause the screw to be lowered. Again, if it is desired to raise the screw, it 1s only necessary to swing the lever 25 over to the opposite end of the quadrant into engagement withnotch 29 The gear 7 will thus move out of mesh with the intermediate gear and intermesh withgear 6, thus trans mittingpower directly thereto and a turning movement which willcause the screw to lift. From the foregoing description, it can readily be seen that-a simple mechanism has been provided for transmitting a turning movement to the nut 5 and that this movement maybe instantly reversed by the operator by merely swinging the lever 25 from one rant to the other. The quadrant is in this instance provided with a bracket at one end, in which is supported a pulley 30. The cord employedfor the purunder the pulley 30, thereby causing the pull changesin theform, proportions and exerted tob'e transmittedto a point as low down as possible with relation to the base of the pedes'talofQthe jack, thereby preventing the same from tipping over before a positive engagement 4 has been made with the I object be li d, I

, The materials and finish of the several parts employed may be such as theexperidictate wish understood that minor movement of the "connecting said transmitting details of construction may be resorted to within the scope of the appended claims and that I do not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A lifting jack comprising a pedestal, a nut turnably mounted thereon, a lifting screw carried by the nut, extending through a central, vertical passage formed in the pedestal, a gear secured to an extension formed on the nut, a second gear adapted to be moved into or out of mesh with the first named gear, an intermediate gear in constant mesh with the first named gear, means for transmitting a turning movement to the second named gear in one direction and means for moving said second named gear out of mesh with the first named gear and into mesh with the intermediate gear or vice versa.

2. A lifting jack comprising a pedestal, a nut turnably mounted thereon, a lifting screw carried by the nut, extending through a central, vertical passage formed in the pedestal, a gear secured to an extension formed on the nut, a stud shaft secured on the pedestal, an eccentric turnably mounted on said shaft, a gear turnably mounted on the eccentric, a second stud shaft secured to the pedestal, an intermediate gear journaled on said stud shaft adapted to con stantly intermesh with the first named gear, means for transmitting a turning movement to the second named gear and means for turning the eccentric to move said'second named gear into mesh either with the first named gear or the intermediate gear.

3. A lifting jack comprising a pedestal,

a nutturnably mounted thereon, a lifting screw carried by the nut, extending through a central, vertical passage formed in the pedestal, a gear secured to an extension formed on the nut, a stud shaft secured on the pedestal, an eccentric turnably mounted on said shaft, a gear turnably mounted on the eccentric, a ratchet gear also turnably mounted on the eccentric in unison with the second named gear, a pulley turnably mounted on the eccentric, manually operated means for transmitting a turning movement tothe pulley a predetermined number of revolutions in one direction, automatic means for reversing the movement of the pulley the same number of revolutions, means for transmitting the turning pulley to the second named gear and the ratchet named gear when manually turned, means for automatically (118- means when the pulley is automatically reversed, an in termediate'gearin constant mesh with the first named gear, means for turning-[the eccentric to bring the second gear into mesh movement when either with the first named gear or the intermediate gear and means for securing the eccentric against turning movement when the second named gear is in mesh with either the first named gear or the intermediate gear.

4. A lifting jack comprising a pedestal, a nut turnably mounted thereon, a lifting screw carried by the nut, extending through a centraLvertical passage formed in the pedestal, a gear secured to an extension formed on the nut, a stud shaft secured on the pedestal, an eccentric turnably mounted on said shaft, a gear turnably mounted on the eccentric, a second stud shaft secured to the pedestal, an intermediate gear journaled on said stud shaft adapted to constantly intermesh with the first named gear, means for transmitting a turning movement to the second named gear, means for turning the eccentric to move sa'd second named gear into mesh either with the first named gear or the intermediate gear, and means for securing the eccentric against turning the second named gear is in mesh either with the first named gear or the intermediate gear.

5. A lifting jack comprising a pedestal, a nut turnably mounted thereon, a lifting screw carried by the nut, extending through Copies of this patent may be obtained for a central, vertical passage formed in the pedestal, a gear secured to an extension formed on the nut, a stud shaft secured on the pedestal, an eccentric turnably mounted on said shaft, a gear turnably mounted on the eccentric, a second stud shaft secured to the pedestal, an intermediate gear journaled on said stud shaft adapted to constantly intermesh with the first named gear, means for transmitting a turning movement to the second named gear and means for turning the eccentric to move said second named gear into mesh either with the first named gear or the intermediate gear and means for securing the eccentric against turning movement when the second named gear is in mesh either with the first named gear or the intermediate gear, said means comprising a lever secured to the eccentric, a quadrant over which said lever is adapte to swing and means at each end of the quadrant for securing the lever against swinging movement.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM H. FIREBAUGH, JR.

Witnesses:

B. O. COWAN, Com 0. RANKIN.

five cents each, by addressing the Gommissioner of ZE'atents,

Washington, D. G.