US1524751A - Lifting jack - Google Patents

Description

J. R. RYD ER LIFTING JACK Feb. 3, 1925. 1,524,151

Filed Aug. 18- 1922 Z Sheet's-Sheet l JR FY05 5% wx-M J. R. RYDER LIFTING JACK Filed Aug. 18. 1922 2 Shuta-Shet 2 Patented Feb. 3, 1925.

OPEC.

JACOB R. RYDER, OF ASHLAND, OHIO, ASSIGNOR TO THE ASHLAND PRODUCTS COM- PANY, OF ASHLAND, OHIO, A CORPORATION OF OHIO.

LIFTING JACK.

Application filed August 18, 1922. Serial No. 582,760.

T 0 all whom it may concern:

Be it known that I, JAooB R. RYDER, a citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in Lifting Jacks, of which the following is a specification.

This invention relates to lifting jacks, and more particularly to jacks provided with a pair of pawls having control means therefor, whereby the device may be employed for lowering the work as well as raising it.

An important object of the device is to provide simple accessible control means as above outlined for controlling the action of the pair of pawls for lowering the standard or raising it to lift the work.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings, I have shown one embodiment of the invention. In this showing:

Figure 1 is a side elevation,

Figure 2 is a central vertical longitudinal sectional view, 7

Figure 3 is a plan view,

Figure 4: is an end elevation Figure 5 is a fragmentary sectional view similar to Figure 2 somewhat enlarged.

Figure 6 is a section on line 66 of Fig ure 5,

Figure 7 is'a detailed perspective of the holding pawl and its associate spring, and,

Figure 8 is a similar view of the pawl control member.

In the drawings, the numeral 10 designates a standard preferably formed of stamped sheet steel, the standard being formed substantially U-shaped in cross section as shown in Figure 6 to provide side I walls 11 and an end wall 12, the opposite end being open as shown. A brace 11 is mounted between the upper ends of the side walls '11. The standard is mounted upon a base 13 and is secured thereto by angle braces 14 through rivets 15.

A lift bar 16 is slidably mounted in the standard against the end wall 12 thereof, 'as clearly shown in Figure 6, the lift bar preferably contacting the-side walls 11 of the standard to prevent side sway. The lift bar 16 is provided upon its inner face with a longitudinal set of ratchet teeth 17 having substantially horizontal lower faces. A guide member 18 is connected between the side walls 11 of the standard to prevent the lower end of the lift bar from swinging inwardly, while the lower end of the latter is provided with a stop pin 19 adapted to engage the guide 18 to limit the upward movement of the lift bar.

The numeral 20 designates an operating lever as a whole, comprising a handle 21 and a handle socket 22. The socket 22 is formed of a pairof complementary stamped members 23 and 24 provided through a portion of their length with flanges 25 which are secured together by rivets 26. The inner ends of the members 23 and 24- are spaced to form arms 27 and 28. extends through the arms 27 and 28 and is mounted in the side walls 11 of the standard to provide pivot means for the operat-. ing lever. A pin 30 is connected between the side walls 11 of the standard and is adapted to be received in a recess 31 in the operating lever to limit the downward movement of the outer end thereof.

Between the spaced arms 27 and 28 is mounted a holding pawl 32 which is also pivoted upon the pin 29 so that oscillating movement of the operating lever does not affect its movement. As shown in Figure 2, the upper end of the pawl 32 is adapted to engage the teeth 17 A spring 33 is coiled about the pin 29, the upper end of the spring being adapted to contactwith the pawl 32 adjacent the upper end thereof, a lip 34: being formed upon the pawl 32 to prevent transverse displacement of the spring. The lower end of the spring'33 is adapted to bear against a pin 34 which is mounted between the inner ends of the arms 27 and 28 but is not connected with the side walls 11 of the standard, as will be understood. It will be apparent that the tension of the spring 33 tends to move the upper end of the pawl 32 inwardly into engagement with the teeth 17. Thelower end of the pawl 32 projects downwardly below the pin 29 as at 35, for a purpose to be described.

An operating pawl 36 is pivoted upon the pin 34 and has its upper. end adapted A pivot pin 29 to engage the teeth 17, as shown'in Figures 2 and '5. A spring 37 is .coiled about thein 34, the lower end of the spring being adapted to bear against the pin 29 while the upper end thereof engages the pawl 36 adjacent the upper end thereof whereby the latter is normally projected into engagement with the teeth 17. A lip 38 is formed upon the pawl-36 adjacent its upper end to prevent transverse displacement of the spring 37. The pawl 36 extends a substantial distancedownwardly below thepin 34 and is providedat its lower end with an'inclined face39for a purpose to be described.

The numeral 40 designates a pawl control membei;"preferablycomprising a piece ofsheet'metal having a flat longitudinal portion 41 pivoted as at 42 upon the pin 29. repair of spaced arms 43 and 44 are formed upon the longitudinal portion 41 and extend inwardly transversely thereof. As shown in" Figures 2 and 5, the projecting end 35 of thepawl 32 is mounted between the arms 43 and 44. The inclined face 39 ofthe pawl 36 is arranged adjacent the arm 44 of the control member.

The numeral 45 designates as a whole, a control spring which is preferably formed of a leaf spring bent upon-itself intermediate its ends to form upwardly diverging ends 46 and 47. The spring 45 is mounted upon a transverse pin 48 connected between the side walls 11 of the standard. As shown in Figured-the inner arm 46 of the spring 45 has its upper end arranged between the arms 43 and 44 and in contactwith the latter. The numeral 49 designates a spring control member which is substantially U-shaped, as shown in. Figure 4. The member 49 is pivoted upon a transversepin:50-connected between the .side walls 11 of the standard and is provided with a lip 51 whereby it may be swung to selected positions. As shown in Figure 5, the inner portion of the U-shaped member 49 is adapted to engage the shorter arm 47 of the spring. 45. In the position shown in Figure 2, with the outer end of the member 49 swung upwardly, tension upon the arm 46 of the spring 45 is released, while in the position shown in Figure 5, tension is placed upon the portion 46 of the spring to normally project the arms 43 and 44 of the control member inwardly.

The operation of the device is as follows:

When it is desired to lift the work, such as an automobile axle, the member 49 is swung to the position shown in Figure 2, relieving tension upon the arm 46 of the spring45. In this position, the springs 33 and 37 are free to project the upper ends of the pawls into engagement with the teeth 17. Downward movement of the outer end of the operating lever lifts the pawl 36 which in turn raises the lift bar 16. During the lifting operation of the lift bar, it will be apparent that the pawl 32 trips over the teeth 17 until the outer end'of the operating lever reaches its lowermost posi tion. The pawl 32 then supports the lift bar 16 while theoute-r end of the operating lever is being moved upwardly, the pawl 36 tripping downwardly over the teeth 17 until the outer end of the operating lever reaches its uppermost position. This action is repeated until the work is raised the desired height, as willbe understood.

When it is desired to lower the work, the member 49 is swung downwardly to the position shown in Figure 5' whereupon a tension will be exerted upon the arm 46 of the spring-45 to project the arms 43 and 44 of the control member 40 inwardly. In this position of the above members, the arm 43 tends to move the extension 35 inwardly and disengage the upper end of the pawl 32 from the teeth 17. Outward movement of the upper end of thepawl 32 isprevented when the handle is in the uppermost position, but is permitted when the latter is in the lowermost position, as shown in Figure 5. In this position, the pawl 32 is disengaged from the teeth while the load is placed upon the pawl 36. Upward move ment of the handle lowers the pawl 36, the lift bar 16 being permitted to move downwardly until the handle reaches its lowermost position. YVhen the handle reaches a point slightly spaced from the upper limit of its stroke, the inclined face 39 engages the arm 44 moving. the lower end of the member 40 outwardly, whereby the projection 35 is relieved of the tension of the spring arm 46. The spring 33 then. projects the upper end of the pawl 32 into engagement with one of the teeth 17. The handle is then moved downwardly, the load being shifted fromthe pawl 36 to the pawl 32, whereupon the arm 44 under tension of the spring arm 46 moves the upper end of the pawl 36 out of engagement with the teeth 17. During the. complete downward movement of the handle, the lift bar 16 is held stationary by the holdin pawl 32. As the handle approaches the ower limit of its stroke, the inclined face 39 is released from the arm 44, whereupon the spring 37 moves the upper end of the pawl 36 into engagement with one of the teeth 17. When the handle starts upon its upward stroke, the load is then shifted from the pawl 32 to the pawl 36 and the spring arm 46 acting upon the projection. 3.), releases the upper end of the pawl 32 from engagement with the ratchet teeth.

It is to be understood that the form of my invention herewith shown anddescribed is tobe taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A lifting jack comprising a standard, a lift bar slidably connected therewith and provided with ratchet teeth, an operating lever pivotally connected with said standard, a holding pawl pivotally connected with said standard, an operating pawl pivotally connected with said operating lever, the upper end of each of said pawls being adapted to engage said ratchet teeth, yielding means to normally move said pawls into engagement with said teeth, a control member including a pair of transverse arms adapted to alternately engage the lower ends of said pawls to move them out of engagement with said ratchet teeth, and resilient means engaging one of said arms for rendering said control member effective.

2. A lifting jack comprising a standard, a lift bar slidably connected therewith and provided with ratchet teeth, an operating lever pivotally connected with said standard, a holding pawl pivotally connected with said standard, an operating pawl ivotally connected with said operating ever, the upper end of each of said pawls being adapted to engage said ratchet teeth, yielding means to normally move said pawls into engagement with said teeth, a control member including a pair of transverse arms adapted to alternately engage the lower ends of said pawls to move them out of engagement with said ratchet teeth, a leaf spring contacting with one of the arms of said control member to actuate it, and means for selectively rendering said spring effective ratchet teeth, a pivot pin mounted between the side walls of said standard, an operating lever mounted upon said pivot pin and projecting from the open side of said standard, a holding pawl pivotally mounted on said pin, an operating pawl pivotally connected with said operating lever, the upper end of each of said pawls being adapted to engage said ratchet teeth, yielding means to normally move said pawls into engagement with said teeth, a control member pivotally mounted on said pivot pin and depending therefrom adjacent one of the side walls of said standard and having a pair of transversely extending arms adjacent its lower end adapted to alternately engage the lower ends of said pawls to move them out of engagement with said ratchet teeth, and resilient means engaging said control member for rendering it effective.

In testimony whereof I afiix my signature in presence of two witnesses.

JACOB R. RYDER. l/Vitnesses:

CLYDE C. SHERIEK, W. F. EIQHELBERGER.

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