US1685015A

US1685015A - Jack

Info

Publication number: US1685015A
Application number: US223767A
Authority: US
Inventors: Francis M Aycock
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-10-03
Filing date: 1927-10-03
Publication date: 1928-09-18
Anticipated expiration: 1945-09-18

Description

Sept. 18, 1928.

- F. M. AYCOCK JACK Filed Oct. s, 1927 INVENTOR ATTOR N EY WITNESS:

Patented Sept. 18, 1928.

entree @WWQE FRANCIS 1V1. AYCGCK, OF SOLDIERS HOME,

ONE-HUNDREDTHS T0 JAMES MARSH, FORNIA.,

JACK.

Application filed October 3, 1927. Serial No. 223,767.

This invention relates to scaffold jacks, and its general object is to provide a scaffold jack that receives the cable of a movable scaffold t'or holding. the scaffold at any desired height in a sate and secure manner. and will operate the scaffold for raising and lowering the same with very little effort on the part of the operator.

A further object: of the invention is to provide a scafl old jack that extremely simple in construction, inexpensive to manufacture, strong and sturdy. light in weight and cfiicient in operation and service.

This invention also consists in certain other features of construction and in the combination and arran ement of the several parts, to be hereinafter fully described, illustratcd in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the scveral views. and in which:

Figure 1 a. side elevation of the jack forming the subject matter of the present invention and showing the scaffold cable applied thereto.

Figure 2 is a front elevation thereof.

Referring to the drawings in detail the numeral 1 indicates the bodyqalate of the jack and which has secured thereto through the medium of rivets or other like securing means a frame which is formed from a single strip of material and includes a substantially U-shaped portion 2 which terminates at its lower end in an ear 3 while its opposite end extends upwardly in an upright 4 and terminates in a right angle bent end 5 which is provided with an opening through which passes the scaffold cable A and acts as a guide therefor as will be readily apparent.

Secured to the lower end of the body plate are the upper ends of the ti -shaped strap 6 for accommodating-the main beam oi the. scadold which is indicated by the letter B.

Mounted in bearing openings formed in the body plate 1 and Ushaped portion of the frame is a shaft 7 which I term the drive shaft, and secured to this drive shaft is a gear 8 which is arranged in constant mesh with a gear 9 and a pinion 10. The gear 9 plate as best shown in Figure 2 of the draw- 1 ings. The pinion 10 is secured to a stub shart 12 which has one end also projecting beyond the outer face of the body plate 1.

Keyedto the projecting end of the stub shaft 11 a steel flange pulley 13 which is provided with a cable receiving part preferably formed from wood, and the inner flange 14 thereof is provided with ratchet teeth 15. Pivotally mounted on the body plate is a pawl 16 which cooperates with the ratchet teeth in a manner as best shown in Figure 1 of the drawings. The cable A is trained about the steel flange pulley as best shown in Figure 2, and extends downwardly to be received between and in the

grooves

17 and 18 of

gears

19 and 20. The gear 19 is carried by the stub shaft 12 while the gear 20 is mounted for rotation on a headed pin 21. A guide pulley 22 is provided for said cable and is mounted for rotation on the body plate 1 above the flanged pulley.

The gear 19 is adjustable with respect to the gear 20 and in order to accomplish this ad ustment, the stub shaft 12 is mounted in slots formed in the body plate and U-shaped portion and is journaled through an opening formed in a substantially L-shaped strip 23 wh ch has a set screw 21 threadedly received in its outer portion as best shown in Figure 1 and engageable with the edge of the body strip, so that upon rotating the set screw. it will be obvious that the gear 19 can be moved as desired to tension the cable accordingly. Fixed to the drive shaft 7 is a crank handle 25 which when rotated will rotatethe gear 8 accordingly and impart motion to the gear 9 and pinion 10. The gear 9 will operate the steel flanged pulley 13 and cause the cable A to travel therealoout as will be apparent which will result in the raising or lowering of the scaffold, it of course depending upon which way the crank handle 25 is rotated.

From the above description and disclosure of the drawings, it will be obvious that l have provided jack for cable operated scafiolds that is extremely easy to operate and due to the fact that the cable is arranged between grooved gears with one of said gears mounted for adjustment with respect to its companion gear, the tension of the cable can be varied in accordance with the operators desires, and this construction will also retain the scaffold in fixed position and prevent the cable from moving even if the pawl 16 is arranged to inoperative position.

It is thought that the foregoing description that the advantages and novel features of my invention Will be readily apparent;

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim is: 1. A scafl'old jack scribed comprising a ho of the character dedy plate having a right angle bent upper end formed with anopening, a 'frame secured to said body plate, shafts journaled in said'body plate and frame, a crank handle secured to one of said shafts, gears cured to said shafts andgbeing arrangedf itconstant mesh, a pulley secured to one of said shafts and receiving a cable of the scaffold, ratchet means included in said pulley, a guide pulley receiving said cable and together with the openingof the upper end of the body plate provide guiding means for saidtcable, and cable tensioning means carried by said body plate.

2. A movable scaffold jack of the character described comprising a body plate, a frame secured to said body plate and including a U-shaped portion, a shaft journaled in said U-shaped portion and body plate respectively, a""shaft disposed upon opposite sides of the shaft first mentioned and also being journaled accordingly, a steel flanged pulleysecured to one of the shafts last mentioned and receiving a cable of the cafl'old, ratchet teeth formed with one of he flanges of the pulley, a pawl pivoted to the body plate and engageable with the ratchet teeth, guide means for said cable and carried by said body plate and frame, a grooved gear secured to one of said shafts, a second grooved gear cooperating with the grooved gear first mentioned and both of said grooved gears receiving said cable thcrebetween and in the grooves thereof, means for moving one of said grooved gears with respect-to the other grooved gear for tensioning the cable means for rotating the pulley and first mentioned grooved gear from said first mentioned shaft and a handle crank for rotating said first mentioned shaft.

3. A movable scaffold jack'of the character described comprising a body plate, a frame secured thereto, grooved gears mounted for rotation and carried by said body plate, a steel flange pulley mounted for rotation and adapted to have a cable of the scaffold trained thereabout, means for guiding said cable, means for operating said pulley and grooved gears simultaneously, means for adjusting one of said grooved gears with respect to the other, ratchet means for said pulley and including teeth formed on one of the flanges thereof, and a scaffold beam strap secured to said body plate.

In testimony whereof I aflix my signature.

FRANCIS M. AYCDCK.