US660507A

US660507A - Lifting-jack.

Info

Publication number: US660507A
Application number: US674400A
Authority: US
Inventors: Joseph Thomas Harbin
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-02-27
Filing date: 1900-02-27
Publication date: 1900-10-23
Anticipated expiration: 1917-10-23

Description

No. 660,507. Patented 0st. 23, |900.

. J. T. HARBIN.

LIFTING JACK.

(Application mea Feb. 27, mooi) (Nu Model.) v 2 Sheets-Sheet l.

w/TNESSES'.- /N VEA/Tof? Patented Oct. 23, |900.

J. T. HARBIN.

LIFTING JACK.

(Application med Feb. 27, 1900.)

2 Sheets-Sheet 2.

(No Model.)

/N VENTOH v WITNESS/: S

W on M m 7m .of wf M d UNITED STATES PATENT OFFICE.

JOSEPH THOMAS HARBIN, OF CONDONfOREGON.

LIFTING-JACK.

SPECIFICATION forming part of Letters :Patent No. 660,507, dated October 23, 1900.

Application filed February 27, 1900. Serial No. 6,744. dio model.)

To @ZZ whom, t Ina/y concern:

Be it known that I, JOSEPH THOMAS HAR- BIN, residing at Condon, in the county of Gilliam and State of Oregon, have invented a new and Improved Lifting-Jack, of which the following is a specification.

This invention relates to that class of mechanical appliances termed lifting-jacks, and primarily seeks to provide an appliance of such character embodying a very simple, compact, and powerful construction of easy adjustment and manipulation and adapted for lifting heavy loads, for use as an ordinary wagon-jack, for mining, logging, or blacksmith purposes, for holding drills in position, for handling heavy rocks or loads, and for lifting railroad-rails or other heavy articles close to the ground, the same being also adapted for truck, dray, and house-moving pur poses.

Generally my invention comprehends a construction including a combination of screw and lever operated devices so arranged that the elevating shank or member can be quickly moved up by lever-operated means or slowly and more powerfully elevated by screw action and in which the screw and lever devices are arranged to act interchangeablyt'. e., the screw forming the ratchet-surfaces for the lever-pawls and the lever-pawls forming, as it were, xed male-thread members with which the screw-surfaces engage when the jack is Operated by screw action.

In its more specific nature my invention embodies a suitable hollow support or standard, a lifting-bar movable vertically within the standard, said bar having an external spiral groove or threadway, and a lever held to straddle the standard provided with a pair of opposing and alternately-operating pawls held to engage the spiral groove in the lifting-bar, said specific construction also including a pair of supplemental pawls mounted upon the standard, that engage the spiral groove in the lifting-bar and which serve principally as a means for supporting the bar in its elevated position and to relieve the lever-pawls of the weight of the said bar and its load.

In its other and more subordinate features my invention consists in certain details of construction and novel combination of parts,

l all of which will be first described and then pointed out in the appended claims, reference being had to the accompanying drawings, in Which- Figure 1 is a perspective view of my improved screw and lever Operated lifting-jack Fig. 2 is a vertical section of the same, the lifting-bar being Shown partly elevated. Fig. 3 is a side elevation showing the supportingsrandard as a tripod, the jack in this arrangement being adapted to lift heavy loads from the ground. Fig. 4 is a horizontal section taken on the line 4 4 of Fig. 2. Fig. 5 is a detail view of the lifting-rod;l and Fig. 6 is a detail view illustrating the lever with the detachable member 9 forming a part thereof.

Referring to the accompanying drawings, in which like numerals indicate like parts in all the figures, l denotes the hollow standard or support, which when the appliance is arranged as an ordinary lifting-'jack has a foot or base l, and at the lower end the said standard has a vertically-extended slot lc. At one side and just above its central or swelled portion lb said standard has a pair of oppositelydisposed slots ld, the purpose of which will presently appear. A lifting bar 2 is held within the standard Al, and the said bar in practice is made of a length at least that of the height of the standard, so that its lower end 2 when the said bar is dropped `to its lowermost position will lie near the bottom of the base of the standard, whereby to bring a foot member 3, secured to the said bar 2, low enough to be projected under heavy objects upon the floor or ground, said foot 3 projecting through and working in aslot l, as shown. The extreme lower end of the lifting-bar 2 has an apertured projection 2b, and when the base or support is in the nature of a tripod, as shown in Fig. 3, said projection 2b provides for readily connecting a chain or hook with the lifting-bar when it is desired to dish a wheel or lift a rock or other heavy load. The upper end of the bar 2 has an annular enlargement or head 2c, formed with one or more radially-extending sockets 2d, adapted to receive a lever-rod when the lifting-bar is to be elevated by the screw action, hereinafter explained.

' 4 indicates a cap loosely mounted upon the top of the lifting-rod, which may have such shape and impact surface as the conditions under which the appliance is to be used may make desirable.

The bar 2 has an external spiral groove or screw a5, extending from its lower end upward nearly its entire length.

At a point about midway its height the standard 1 has a swelled portion 1b and brackets 1e, between which and the standard proper the straddle portions 6a of the lever 6 rest, said portions 6 being held to rock upon the stub-screw bearings 7, that project through the brackets 1e and enter sockets in the standard, as clearly shown in Fig. 4. In its simplest form the lever has its handle portion 6c projectedto one side only, its opposite end, however, terminating in a blunt portion 6d, which is so formed that a cuff member 8 may be readily slipped thereon to form a socket to receive the detachable leverhandle 9, which under certain emergencies can be made fast to the lever-body proper, whereby to permit of two persons operating the lever from opposite sides, when desired.

10 10 designate ratchet-pawls carried by the lever 6 and disposed one upon each side of the standard, said pawls being so mounted upon the lever that their upper ends will normally drop through the slots 1c in the standard, such inward pressure of the pawls being made possible by suitable springs 11, held within sockets formed in the lever 6 and to bear against heel portions of the pawl, as best shown in Fig. 2, by reference to which it will also be seen the upper or penetrating ends of the pawls are inclined or beveled on opposite angles, whereby the said ends will positively engage with the screw-groove or threadway 5 of the lifting-bar 2.

So far as described the manner in which my improvement operates is as follows: Assuming the parts to be in the position shown in Fig. 2, the lifting-bar supported in its elevated position by the pawls 10 10, the same forming, as it were, stop-clutches when in the position shown, now by pressing the lever 6 down the outer pawl (meaning .the one at the left of Fig. 2) acts as a supporting and lifting clutch,while the other pawl slides freely downward over the face of the bar 2 until it drops into engagement With the next or lower ratchet-surface, it being understood that as the bar 2 is not rotated when lifted by lever action the diametrically-opposite faces of the groove a5 form, as it were, a pair of clearly-defined vertical ratchet-surfaces.

To provide for a quick drop of the bar 2, a band 12, adapted to be slid over the upper end of the standard, is employed, which rests upon the swelled part of the standard and under the clutch-pawls 10 10. By raising the band 12 both vpawls will be quickly freed from engagement with the bar 2 and the said bar thereby permitted to move freely within the standard. When it is desired to elevate the bar 2 by screw action, it is only necessary to insert a lever-rod into any one ofthe sockets in the bar-head and rotate the bar to the right, the clutch-pawls 10 10 during this operation acting as stationary thread-engaging members.

13 13 indicate a pair of supplemental pawls pivotally secured in the upper end of the standard and held to drop with their nose endsin engagement with the groove or thread`- way a5 in the bar 2, said pawls being held to their engaging position by gravity or by spring, or both. l

From the foregoing, taken in connection with the accom panying drawings, it is thought the advantages of my invention will readily appear.

When used as an ordinary jack, the bar can be elevated quickly by lever action, and when necessary to raise it slowly and with a powerful action it can be lifted by screw operation. The several partsare so arranged that the appliance can be readily adapted to the various uses before referred to, for each of which uses it will quickly, conveniently, and effectively operate.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is-

1. Aliftingjack,comprisingahollowstandard; a lift-bar vertically and rotatably movable within the standard, said bar having a spiral groove or threadway, and a lever mech-v anism, including a pair of clutch-pawls adapted to engage with the spiral groove and at opposite sides of the lifting-bar, as described.

2. A lifting-jack, comprisingastandard; a lifting-'bar rotatably and vertically movable within the standard; means for quickly elevating the standard, and clutch-pawls engaging the standard for holding it to its elevated position, said standard having an external spiral groove engaging the pawls and operatively connected therewith, whereby when the said lifting-bar is rotated it will move Vertically as specified.

3. In a lifting-jack, the combination with the standard; the lifting-bar vertically movable therein, said bar having vertical racksurfaces on opposite sides; a lever straddling the standard; a pair of pawls carried by the lever, said Vpawls being arranged to engage the rack-surfaces of the lifting-baron the opposite sides; means for normally holding the pawls'in engagement with the said surfaces, and a member vertically movable upon the standard for engaging with and shifting the pawls to an inoperative position as specied.

4t. The combination with the hollow standard having vertical slots disposed diametrically opposite each other; the lifting-bar movable in the standard, said bar having an eX- ternal spiral groove or threadway; a lever pivoted upon the standard below its slots to swing in a vertical plane; a pair of clutchpawls secured on such lever, one at each side of the standard, said pawls projecting through the coincident slots of the standard to engage with the lift-bar, said pawls being also oper- IOC IIO

IZO

atively arranged to alternate as a stop member and as a lift-pawl; and supplemental pawls supported on the standard and normally moved in position to engage the liftbar at a point above the standard and serve as stop-pawls, as specified.

5. Alii'tingjack,comprisingahollowstandard having a vertical slot at one side near its bottom, and a pair of slots in its upper end, the upper slots being diametrically opposite each other; a lifting-bar having an external spiral groove and having at its upper end a head-piece formed with radial sockets; a laterally-'projecting lift member securedvto the lower end of the bar and projected through the bottom slot of the standard; and a lever horizontally pivoted to the standard to rock in a vertical plane, said lever having a portion straddling the standard; the paWls and the springs for operating them carried upon JOSEPH THOMAS HARBIN;

Witnesses: l y

SAM E. VAN VAoToR, FRED DONALDSON.