US877386A - Lifting-jack. - Google Patents

Description

Y PATENTED JAN. 2l, 1908. E. WnTOPPING & T. V. PLIGE.

LIPTING JACK.

APPLICATION FILED Mme. v19o?.

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LIPTING JACK.

P I ATION FILED M Y6. 1 0'7. A PL o A 9 2 SHEETS-SHEET 2.

'PATENTED JAN.21,1908.

ENTTEE sTATEs PATENT oEEicE.

EDWARD W. TO'PPING AND THOMAS V. PLIOE, OF ASHLAND, OHIO, ASSl vHORS TO SAFETY DOOR HANGER 00 OF ASHLAND, OHIO.

LIFTING-J'ACK.

Specification of Letters Patent.

'Patented Jan. 21, 1908.

To all whom 'it 'may concern.:

Be it known that we, liowmn W. ToPrrNe and THoMAs V. Perch, both citizens of the United States, and residents of Ashland, in the'county of Ashland and' State of Unio', have invented certain new and useful lmprovements in Lifting-Jacks, ol' which the following is a specification.

Our invention vpertains to lifting jacks in general, but is especially adapted for use in connection with automobiles, and has for its main object the provision of a durable and powerful device wherein the parts are few in number and the friction between the parts is so reduced that heavy weights or bodies may be easily lifted.

Further advantages are in the means for reversing the. direction of movement of the lifting-bar, and numerousyother advantages will appear throughout the 'specification and drawings wherein, 3

Figure l is an elevation view of the invention. Fig. 2 is a vertical section online 2 2' of Fig. l. Fig. 3 is a top plan view of Fig. 1. Fig. 4 is a cross-section on line 4-.-4 of Fig. l, and Fig. 5 is a View similar to Fig. 4 with the pawl in reversed position.

Referring now more specifically to the drawings, 6 is a standard, hollow inform and provided witha suitable base 7. The standard 6 has a bearing-box 8, that is preferably formed integral therewith, and at the bottom of said box is a hardened metal apertured plate 9 having an annular ball-bearing seat or race-way 9, while the interior wall of said bearing-box is groo ved to form a ball-bearing seat or race-way l0 disposed in a horizontal plane near the top thereof. The plate 9 has a central opening corresponding in form to the cross-section of the lifting-bar, for a. purpose hereinafter described. A circumferential llange12 surrounds the bearing-box 8. A lifting-bar 13 is threaded throughout its length, .but is flattened on opposite sides so as to slide freely through the opening in the plate 9, by which it is held against rotation.

Threaded upon the lifting-baris a nut 15- having cooperating ball-bearing surfaces or race-ways 9b and l0, Vand formed integral with the nut is a ratchet disk 16 which is provided with the usual ratchet teeth 17.

A hand wheel 18 is situated above the ratchet disk and all'ords a means for turning the nut to speedily raise or lower the liftingbar when not under load. lIn the preferred form of construction the nut, ratchet disk and hand wheel are all formed integral. The nut is rotatably seated within the bearing-boXS so as to bring the aforementioned race-ways for the nut 15 to facilitate the turning thereof with slight friction and that the ball-bearings 20, when the parts are assembled, prevent the vertical movement of the nut relative to the standard. The lifting-bar is provided with a head 2l to afford a suitable surface to come in contact with the article to be lifted. As a further means for revolving the nut whereby the lifting-bar may be raised or lowered when under load we provide a collar 22 that surrounds the exterior of the bearing-box 8 resting on iiange 12; and formed ii'itegral with the collar is a bracket 22 carrying a vertically pivoted horizontal pawl 23. 'lhe pawl is of the double-acting type, being provided at its 'opposite ends with two dogs 24 and 24, and having a central vertical shank'Z that is rotatably mounted and has a bearing in an aperture 26 in the bracket 22 and is pivoted to the lower portion thereof, as shown at 27. The bracket is provided on its outer side with a fixed vertical guide 28, for a purpose that will be hereinafterdescribed. As arneans for moving the ratchet through the pawl, a handle 29 is provided having two ears 3() 'and 30a that have a bearing on either side of the shanli'25 of the pawl, and are pivotally secured thereto by means of the horizontal pin 31. Centrally' located uponl the handle and intermediate'of the two ears 3U and 30UL is a prong 32 that is adapted to be moved on either side of the fixed guide 28 to rock the pawl and throw one or the other of the dogs into engagenient with the ratchet teeth according to which side of the guide it engages.

'lhe preferred manner of assembling the device is torlirst place the collar upon the bearing-box and then to drop the lifting-bar with the nu t thereon into its proper position, having lirst plane-d the lower set of ball-bearings YlJ within theirseat. When the parts are in the position as just described, the ballbearings 2l) are dropped into place through an aperture 32) in the bearing-box and an aperture 34 in the collar, which apertures are adapted to be 'brought into register, whereupon a screw 35 conlines the bearings against escape. When the arts are assembled, as

i movement of the lever or handle tosmall just described, the' andlewill hangin the i space.

i side of the iiXed guide 28, the pawl will asduced.

sume a position as shown in Fig; 5 with the dog 24a engaging the ratchet, and by a movement of the handleto ythe lett, as shown in Fig. 5, it will turn the nut l5, that is station-- ary vertically relative to'tlie standard, thereby forcingI the lifting-bar upward by reason of the threaded vengagenient of the liftingbar and the nut. There is su'tlicient play or movement between the prong and the i'iXed guidev to throw the pawl out oi 'engagement with the teethl onithe ratchet on the return swing of the handle so Athat when the handle has been moved tothe left `a sufficient distance, according tothe position and convenience of the operator, the handle can be moved backv a' slight/,distance toi bring the prong againstthe iiXed guide'fwhereu on, on the further retrnswingof the handle, the pawl will be thrown out oi engagement and brought to a new position inA engagement with the teeth. `When the liftingfbar has been raised to the desired height and a re-' just described, causing the lifting-bar to be moved downward. lt can be thus readily. seen that the `,raising or lowering of the lift ing-bar is detelrrnined by a simple movement 0f the handlel whereby the prong is broughtupon one vside or the other of the 'fixed guide.

From the foregoing description it will be seen that the entire weight of the body lifted lcomes upon the nut 15 which in turn is supported by the ball-bearings, and that the rotation of the nut is accomplished very easily for the reason tliatiriction between the nut and the bearingbox is greatly re- It will be further seen in operating K a j ack of this character that the'nieans-for re- We de not wish it understood that our invention is confined to the precise structure .herein shown, as it is obvious that various changes andl modifications may be made without departingfrom the spirit of the invention, and therefore without conning ourselves to the specific details of construction, y y

Ve claim:

l. In a lifting jack, the combination of a nut. having at ratchet thereon, a lifting-bar having a threaded connection with said nut but non-rotatably confined therein, a double pawl carrying dogs adapted to have an engagement with said ratchet, a handle secured to said pawl for rotating said mit;A and a guide for determining the engagement lof one of the dogs of the double pa'wl with the ratchet as the handle is swung into operative position, substantially as described.

2. In a lifting jack, the combination of av standard, a nut rotatably confined within said standard and having a ratchet thereon, a lifting-bar having e threaded connection with said nut but `nonrotatably contined therein, a collar rotatably mounted on said standard,4 a double pawl pivotally mounted 1 on said collar and carrying dogs adapted to 'have an engagement with said ratchet, a

handle secured to said pawl tor rotating said nut, and means on said collar and handle for determining thek engagement of one of the dogs of the double pawl with the ratchet as the handle is swung into operative position, substantially as described.

3. In a lifting jack, the combination ofv a standard, a nut rotatably confined Within said standard and having a ratchet thereon, a lifting-bar having a threaded connection with said nut but non-rotatably conned therein, a collar rotatably mounted on said standard, a double pawl pivotally mounted' on said collar andv carrying dogs adapted to have an engagement with said ratchet, a' handle secured to said pawl for rotating said nut, and a guide for determiningy the engagement of one of the'dogs ofthe double pawl with the ratchet as thev handle is nsw-ung into operative position, substantially as described. y

EDW'ARD' W. TOPPING. vTHOMAS' V. PLICE. f

Witnesses:

TENA Moons, Citas. J KENNY.

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