US1652729A - Concrete rod puller - Google Patents

Description

4 Dec. 13, 1927.

H. W. RANNIKKO CONCRETE ROD FULLER Filed NOV. l 1926 y l o n n Patented Dec. 13, 1927.

UNITED STATES HJALMAR W. RANNIKKO, F WILMINGTON, CALIFORNIA.

CONCRETE ROD FULLER.

Application led November 1, 1926.

My invention is a concrete rod puller for pulling rods from concrete after the concrete has been sufficiently set to allow removal of the-forms.

An object of my invention is a pulling machine or a jack which may be utilized to pull rods from concrete structures, such rods being usuallyT used in holding the forms, as in the construction of walls or the like, and the rods are pulled either before or after the forms are removed.

Another object of my invention is to pull the rods with a straight pull so that they will not become bent in the pulling operation and also to engage the rods with pressure dogs or Wedges on oppositev sides so that the rods will be evenly stressed in the pulling.

A further object of' my invention is to pull therods in a succession of short movements of the gripping dogs and in the return movements to positively hold the rods to prevent same frombeing pressed back into the concrete. wWith the use of my rod puller the rod so withdrawn from the concrete structure may be utilized again without any straightening or manipulation of any kind. Y

My invention, as illustrated in the accompanying drawings, 1n which:

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` Figure 1 is a side elevation of my rod puller, as if taken in the direct-ion ofV arrow 1 of Fig. 2;

Figure 2 is a plan view taken in the direction of arrow 2 of Fig. l.

Figure 3 is a transverse section on 'the line 3-3 of Fig. 2.

YFigure 4 is a perspective view of the gripping wedges.

Figure 5 is a detail ofthe arrangement for holding the gripping wedges suspended.

In the drawings a concrete struct-ure may indicate a vertical wall or the like. The p ulling device has a base 1 and at -its forward end a pair of posts 2, spaced apart, extending outwardly at right angles to the base, these being rigidly secured to the base and also having lugs 3 rigidly connected to the base and to the posts. A column 4 extends upwardly from the base parallel to the posts vand is spaced midway between same. This column has a pair ofears 5 at its upper end.

l A lifting lever 6 is mounted o n a heavy pivot pin 7 through the ears 5 and extends between the postsV 3 having divided outer ends 8 and 9. i

Serial No. 145,584.

A lifting block 1() hastal pair of passages 11 therethrough and is fitted to. slide on the posts 2. A neck 12 fits between the ends 8 and 9 of the lifting leverV 6, there being a head 13 engaging underneath such ends. The block has an opening 14from side to side closed by cover plates 15, wedges 16 slidably mounted in the block, and the block and the wedges have co-acting surfaces 17. Each of the wed es has a series of somewhat semi-circular gripping teeth 18 in order to grip the sides of the rods 19, slidable through an aperture19 in the base, to pull same outwardly, a lifting rod 20 is secured to eachvof the wedges fitting in asocket 21 and being secured by a pin thereiml thev rods pass through an opening 22 in the upper part of the block. Coiled springs 23 are under compression tending to force the wedges downwardly, and coiled springs 24 on theupper part of'the lifting rods engage angular' l'evers 25 pivotally connected to the upper ends of the lifting rods by pins 26. By ythis construction, when the levers are shifted from the position shown in Fig. 5 so that the free end is lowermost, the upper springs are compressed and lift the wedges upward- Vly, compressing the lower springs. This action is sufficient to free the wedges from eni gagement with any of the usual sized rods being pulled.

A dog 27 is pivotally mounted in a bracket 28 having grippingteeth 29 and is actuated by a spring 30 normally forcing the teeth into engagement with the rod being pulled.

The power lever 31 has a socket 32 for a handle 33, or other leverage arm, and is provided at its lower end with a yoke 34, the arms of the yoke being connected by a heavy pivot pin 35 to the lugs 3. A heavy pressure pin 36 extends transversely between the arms of the yoke and has a pair of rollers` 37 mounted thereon. These rollers, in the upward movement of the power lever, engage the under surface 38 of the lifting lever and force same upwardly. In order to draw the lift-ing lever downwardly an arm 39 vis attached to a hub 40, this hub being free to rotate on the pin 36, the arm havin a roller 41 engagingthe upper surface 42 o the lifting levers, therefore in the downward movement of the power lever 31, the lifting levers are pulled downwardly.

The manner of using and functioning of my concrete rod puller is substantially as follows: The device is fitted over a. projecting rod from a concrete structure, preferably after the forms have been removed, the rod fitting through the aperture 19 and entending through the head 13, the neck 12, and the main port-ion of the blockf10. The wedges 16 are pressed by the springs 23 into close engagement with the rod after the angle lever 25has been shifted to the position shown in Figp, then presuniing the device is in the position ofv Figs. 1 and 2 and the power lever 31 is moved upwardly, that is swinging in a counter-clockwisedirection, the rollers 37, on the pin 36 running on the under surface 38 of the lefting lever f 6,v elevate such lever. This lever, by means of the separated endsS and S), lifts upwardly on the block 10 and in this action the wedgesfare forced into tight engagement with the rod and elevate same until the pow-V erlever"occupies a. position substantially "parallelto the posts 2. On the vdownward movementv of the Vpower lever 31, the dog 27 being spring pressed, grips the rod and prevents it being forced backwardly into the concrete. The downward movement of the power, lever 31 towards the wallcauses the arm 39 toy pull on the lifting lever 6, due to its engagement with the surface 42. This engagement need be only on one of the ends 8 or 9, and as shown on the end 9. By continuous up and down movements of the lower lever, that is from and towards the wall, the rod is given an outward pull from the concrete in intermittent motions until either completely removed or sufficiently v vloosened to be moved by hand.V

It will be seen by my device that I secure very great leverage having the power lever act on the lifting lever and while the length of the stroke is not particularly great compared with the movement of the power lever, nevertheless the force exerted on the rod to pull same is many fold the amount of power required to be applied to the power lever,

especially when using a handle 33 of some length. It is to be noted-that the pull on the 'rod is straight and that the rod is always pulled with a tension parallel to the posts and moreover that there is no squeezing aetioii on one side only which. would tend to give the rod a slight bend or acurve after leaving the pulling device. Th-erefore in my construct-ion of a concrete rod puller, lthe With my construction of rod puller, the

device is held securely in place against the concrete wall or the forms and does not reand, as the rod becomes loosened, prevents same from being thrust back` and into the wall.

Various changesy may be made in the principles of my invention without departing from the spirit thereof, as set forth in the description, drawings and claims.

l claim:

1. A rod puller comprising in combination, a base having'a pair vof guide posts, a block having'rod gripping devices slidably mounted on said posts, a lifting lever, means forming a pivotal connection of same with the` base, a power lever, means forming a pivotal connection of 4same with the base, and vmeans to interengage the power lever and lifting lever, the lifting lever acting on the block.

2. A rod puller, as claimed in claim V1, having means inter-connecting the power lever and the lifting lever to return said lifting lever to its initial position on the return movement of the power lever. Y v

3. A rod puller comprising in combination, a base, a plurality of guide post-s fixedly secured thereto, a block slidably mounted on said posts, gripping wedges slidable in said block to grip a rod, a lifting lever engaging said block, means forming a pivotal connection between said lever and the base, a power lever pivotally connected to the base, a pressure pin on the power lever, said pin engag ing a surface of the lifting lever to actuate same on movement in one direction of the power lever.

d, A rod puller, as claimed Yin claim 3, an arm pivotally connected to the power lever and slidably engaging thelifting lever to return said lever to its initial position on movement of the power lever.

5. A rod puller comprising in combination, a. base, a plurality of guide posts rigidly connected thereto, a column fixedly secured Vto the base, a lifting lever pivotally connected to the column and extending between the said posts, a block slidably mounted on the posts engaging the upper and lower surface of the lifting lever, gripping wedges slidably mounted in the block, a power lever pivotally connected to the'base, a pressure pin on said power lever', said pin engaging the lifting lever in one direction of movement on an under surface.

6. A rod puller, as claimed in claim 5, an arm pivotally connected to the-pressure pin and having a` sliding engagement with the upper surface of the lifting leverV to Vreturn same to its initial position on the return movement of the power lever.

ylifting rods to disengage and engage a rod being pu'lled` and means to shift the block to pull a rod.

9. In a rod puller, a base, a plurality of guide posts rigidly connected thereto, a

block slidably mounted on said posts and having a plurality of gripping Wedges slidable therein, means to shift said Wedges to engage or disengage a rod being pulled, a. dog pivotally connected to the base to engage a vrod and prevent its being forced in reverse direction, and means operable on the block to slide same in a. direction to pull a rod and in a direction to secure a second grip on the rod being pulled.

VIn testimony whereof I have signed my name to this specification.

HJALMAR W. RANNIKKO.

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