US660766A - Triple-action jack. - Google Patents

Description

m1. 660,766. Patented Oct. 30, I900.

E. E. L. BUYER. TRIPLE ACTION JACK.

(Application filed July 18, 1900.)

( No Model.)

Hndnhm WITNESSES:

UNTTED STATES PATENT OFFICE.

EDITH E. L. BOYER, OF DAYTON, OHIO;

TRIPLE-ACTION JACK.

mementos forming part of Letters Patent No. 660,766, dated October 30, 1906.

Application filed July 13, 1900. Serial No- 23,466. (No model.)

To all w/tmn it may concern:

Be it known that I, EDITH E. L. BOYER, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented a certain new and use fulImprovement in Triple-Action Jacks; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a lifting-jack, but appertains more especially to that class known as triple-action jacks.

The objects of my invention are to provide simple and reliable means for lowering step by step and for making a quick drop in a jack strong and easy of construction and inexpensive in cost of manufacture; also, the providinga jack with the mechanism entirely inclosed and protected by the casing.

Referring to the accompanying drawings, illustrating my invention, and in which like numerals and letters of reference indicate corresponding parts throughout the several views, Figure 1 is a side view of my improved jack with the casing in vertical section and showing the inside with the mechanism partially in section and the position the parts assume during the operation of lowering, with the retaining-pawl held out of engagement with the ratchet-barand the lifting-pawl engaging the ratchet-bar when about to lower the load. Fig. 2 is a side view of my improved jack with the casing in vertical section and showing the inside with the mechanism partially in section and the position the parts assume during the operation of lowering, with the retaining-pawl engaging the ratchetbar and supporting the load and the liftingpawl held out of engagement with the ratchetbar for the purpose of rising without lifting the ratchet-bar. Fig. 3 is an enlarged detail View in perspective of the lowering device. Fig. 4 is a sectional View of the upper ortion of the casing broken away, so as to show the retaining-pawl and its actuating-spring with its plunger and casing in section, these in position to throw said retaining-pawl out of engagement with the ratchet-bar for a quick drop; and Fig. 5 is an enlarged detail view in perspective of the small handle or thumbpiece which moves the actuating -spring, plunger, and the easing into position to throw the retaining-pawl in or out of engagement with the lifting-bar.

Referring in detail to the various parts of my invention as shown in the accompanying drawings by means of the aforesaid numerals and letters of reference, 1 indicates the easing, which entirely incloses and protects the mechanism, said casing being suitably and conveniently provided on the inside of both sides of the front with a rib 2. The ratchet or lifting bar 3 is provided at its top with a cap or top 4 for supporting the load while being raised or lowered. 5 is the foot, located at the bottom of said lifting-bar for the purpose of raising or lowering a load which is too low or near the ground to be supported by cap 4, said foot being provided on each of its sides with a groove 6, adapted to rest over rib 2 of the casing, thus assisting in holding said ratchet or lifting bar in position and guiding it as it is moved up or down during the operation of the jack.

7 is the lever-socket, in which is inserted the handle or lever for operating the jack, said socket being formed with a bifurcated end 8, one side of which is formed with fingers 9 and 10, as shown in Figs. 1 and 2, (and which will be more specifically referred to hereinafter,) the other side of said bifurcated end being the exact size in circumference of the boss, as shown at 11. Located between the two sides of the bifurcated end is eccentric 12, as shown in dotted lines, which is provided at each side with a projecting or fulcrum pin 13. The ends of said pin pass through the bifurcated end of and support said lever-socket by being revolubly journaled in bearings in the casing, and thus form the fulcrum upon which said lever socket turns.

Eccentric 12 is securely connected to the bifurcated end of the lever-socket by a small pin 14. Lifting-pawl 15 is mounted on said eccentric and provided with a spring 16, suitably connected at its top at 17 to said liftingpawl and at its bottom, as at 18, for the purpose of exerting a constant and suflicient tenend 23 of plunger 24, which is incased in cas ing 25 and actuated by spring 26, presses against the lower end27 of said retainingpawl, thus turning or pressing said retaining-pawl forward, so that its teeth 28 will engage teeth 20 of ratchet-bar 3, said spring yielding to permit their disengagement.

When the lowering device or bar A is brought into action for the purpose of lowering the ratchet-bar step by step or tooth by tooth by placing thumb-piece or handle 5 into the straight portion of slot and guide 38 in one side of the casing (shown by dotted lines in Figs. 1 and 2) and when the handle or le- 'ver and socket is pressed to a horizontal position, (shown in Fig. 1,) eccentric l2 raises lifting-pawl 15 and its teeth 19 (by means of the tension of spring 16) will be brought into engagement with and support said ratchet or lifting bar 3, and finger 9 of socket 7 will strike lug ct of the lowering device or bar A (guided by handle-piece b and shoulder 0) until straight shoulder e of said lowering device or bar coming in contact with lug 29 of retaining-pawl 21 will cause it to rotate on shaft 22 and its teeth28 will be forced out of engagement with teeth 20 of ratchet-bar 3 and all the parts assume the positions shown in Fig. 1, where the retaining-pawl is held out of engagement with lifting-bar and the load is resting on lifting-pawl ready to descend with said lifting-pawl as the lever is raised. Then the lever or handle is moved to an upward position, socket 7 will turn on its fulcrum-pin 13, and lifting-pawl 15, carried by eccentric 12, will be lowered the distance of one tooth, carrying lifting-bar 3 with it. Finger on upper end of lever-socket will sweep or pass through a recessed or cut-out portion (1 in lowering-bar A, (see Fig. 3,) held by pressure of lug 29, forcing its shoulder 0 against casing, and strike its lug a, thus throwing it downward and moving its shoulder 6 out of engagement or contact with lug 29, thus releasing said retaining-pawl, which, actuated by its spring 26 and plunger 24, will engage the lifting-bar 3 and support the load; but its teeth 28 will engage teeth 20 of said lifting bar 3 one tooth higher up than those engaged by said retaining-pawl before it was forced out of engagement with said teeth by shoulder e of lowering device A, as heretofore described. This by-reasoh of ratchet-bar having been lowered said tooth or step with lifting-pawl while retaining-pawl was held out of engagement with lifting-bar, as heretofore described. Then by continued upward motion of lever or handle projection 30 on lifting-pawl comes in contact with brace-bar 31, said brace-bar and said projection being so formed that when they come in contact said lifting-pawl will be forced away from said lifting-bar and its teeth 19 be thrown out of engagement with teeth of said lifting-bar. Then lowering device A being free to fall, its shoulder 6 will fall behind teeth 19 of lifting-pawl l5 and all the parts assume position shown in Fig. 2. Now pressing down the lever or handle in continuing the operation of lowering the load step by step liftingpawl 15 rises until its teeth 19 have risen up past one tooth on ratchet-bar before finger 9 strikes lug a, on lowering-bar, causing shoulder 6 to be lifted above and release said lifting-pawl, thus allowing its teeth 19 to engage said higher tooth on lifting-bar. Lowering device A is still further raised by linger 9 until its shoulder e engages lug 29 of retaining-pawl 21, and the parts are again as in Fig. 1,'except that the lifting-bar is one tooth 'lower down than before the upward-anddownward motion of the lever or handle just described.

To raise the load, lowering device or bar A is moved by simply moving small handlepiece I), which projects through the slotted opening and moves through said slot 38, located in one of the sides of the casing, until said handle-piece rests in the notched or recessed portion 32 and said lowering-bar has assumed the position shown in dotted lines in Fig. 2, where it is entirely out of the way of and free from contact with lug 29, teeth 19, and fingers 9 and 10, allowing the lifting and retaining pawls to engage lifting-bar by reason of the action of spring 16 on said lifting-pawl and spring 26 and plunger 24 on said retaining-pawl and work in the ordinary manner of a ratchet. Brace-bar 31 does not interfere with said working, it being so situated that lifting-pawl 15 must be'moved slightly farther down than necessary in the ordinary working before the projection strikes said brace-bar 31.

When it is desired to drop the load suddenly or make what is termed a quick drop, lowering device A is moved to the position as just described and as shown in dotted lines in Fig. 2, where it is entirely out of the way and free from contact with any of the parts, and eccentric is turned by means of small thumb-piece or handle 33, (shown in Fig. 5,) which fits over pin 34 of eccentric 35, while the other end is journaled in the casing, (from the position shown in Figs. 1 and 2 to the position shown in Fig. 4,) and by means of slot 36, in which it turns, turns the casing or shell 25 on shaft 37, journaled in casing l of the jack, forcing end 23 of plunger 24 past end 27 of retaining-pawl 21, when it will press said retaining-pawl outwardly from teeth of lifting-bar. A slight downward motion of lever will now release retaining-pawl from pressure of the load, when it will assume the position shown in Fig. 4, with its teeth out of engagement with teeth of lifting-bar. Then by upward motion of the lever the lifting-pawl 15 will descend until its projection 30, coming in contact with brace-bar 31, will be thrown and held in an outward position, forcing its teeth 19 out of engagement with the teeth of 1ifting-bar3, as shown in Fig. 2, thus leaving said lifting-bar unsupported, when it will make a quick drop.

A very important feature of my invention consists in the simplicity of construction of the lowering device or bar, which is formed in one piece Without any multiplicity of parts.

Having now described my tri ple-action jack, What I claim as my invention is- 1. In a lifting-jack, the combination with a suitable casing, having a slot or guide and a notch at one side thereof, a lifting-bar, a lever provided with fingers, a lifting-pawl and a retaining-pawl, of a lowering device formed with a projection, adapted to move in said slot or guide and thus hold the lowering device in operation, or to be placed in said notch and thus hold the lowering device out of operation, said lowering device having a shoulder adapted to engage and disengage the lifting and retaining pawls alternately, and a lug adapted to be engaged by the fingers on the lever only when the lowering device is in position to operate, substantially as described.

2. In a lifting-jack the combination of the lifting-bar; the lifting and retaining pawls adapted to engage or disengage said liftingbar; a projection on said lifting-pawl; a bracebar adapted to engage said projection; a lowering device consisting of a single member so formed and constructed as to alternately disengage said lifting and retaining pawls from said lifting-bar; and means suitably arranged within its casing or body for operating said jack, all substantially as described.

3. In a jack with its lifting-bar; the combination of the lifting and retaining pawls; the lowering device consisting of a single piece formed with a lug; a handle or lever provided with a socket; an eccentric with its fulcrumpin upon which said lever-socket turns; fingers formed on the end of said socket and adapted to engage said lug of said lowering device, for the purpose of raising and lowering said lowering device; said lowering device adapted to throw and hold said retaining and lifting pawls out of engagement with said lifting-bar; all substantially as described.

4. In a lifting-jack, a retaining-pawl adapted to pivotally move on bearings, and having an end suitably formed and adapted for engagement with the lifting-bar; in combination with a shell or casing, pivotally mounted and provided with a slotted portion, an cecentric turning within said slottedportion, a plunger and its actuating-spring within said casing, adapted to engage said retaining-pawl and press or throw it into or out of engagement with said lifting-bar, substantially as described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

EDITH E. L. BOYER.

Witnesses:

E. J. FINKE, W. H. H. 1310111.

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