US2332032A - Rod puller - Google Patents

Description

0a. 19, 1943. A, E TROIEL 2,332,032

ROD FULLER Filed March 27, 1941 INVENTOR. ARTHUR E. TED/EL.

A T TOENEK Patented Oct. 19, 1943 ROD FULLER Arthur E. Troiel, Berkeley, Calif. Application March 27, 1941, Serial No. 385,519 I 2 Claims. 101.2;4-29) to provide a complementary fit with the ratchet My invention relates to rod pullers and more particularly to rod pullers adaptedfor use in the.

bracing of forms for concrete molds in the fabrication of large structures as concrete dams and the like. v

Among the objects of my invention are 1. To provide an improvedrod puller which can be conveniently handled and operated;

2. To provide an improved rod puller adapted for heavy duty work and which is designed to reduce the operating effort-on the part of an operator to a minimum;

3. To provide an improved rod puller of simple but rugged construction assuring certainty of operation in use; and

4;10 provide an improved rod puller capable of rapid manipulation in normal use.

Additional objects of my invention will be brought out in the following description of the same taken in conjunction with the accompanying drawing wherein- Figure 1 is a longitudinal view in section through the entire device;

Figure 2 is a view in section transverse of the device taken along the line 2 --2 of Figure 1;

Figure 3 is an end view in the direction indicated by arrow 3 of Figure 1; and

Figure 4 is a view illustrating the application of my improved rod puller in'the bracing of forms handle ll. At the same end, the inner member 5 is provided with a pair of upstanding ears l3- between which is pivoted, as on a shaft IS, a cam lever ll, including a cam head Ill. The contour of the cam head is formed on a spiral and is serrated to provide a series of teeth 2|.

At an intermediate location, a pair of diateeth 25.

The ratchet handle 29 is maintained in position about the ratchet by a handle retaining collar 35, which is threaded upon the end of the outer member "I and secured thereto against accidental unthreading. by means of a setvscrew 31 passing radially through the collar and engaging the threaded end of the member I. This ratchet handle retaining collar has a scalloped periphery 39 to provide for convenient manual gripping of the same.

A cylindrical fitting 4| formed with an intermediate rib 43 is assembled to the other end of the outer member by telescoping a portion 45 of reduced diameter'into the open end of the outer member. This. cylindrical fitting is retained against withdrawal by a holding collar 41 which is slipped over the exposed end of the fitting 4| and threaded to the outer member suflicientlyto prevent displacement of the fitting-but not sufiic'ient to bind the same against independent relative rotation with respect to the outer memher. The opposing surfaces between the rib 43 and the end of the outer member I are preferably grooved to provide a ball race to receive a plurality of ball bearings 49, whereby to facilitate such independent relative rotational movement of the fitting.

The advantages of my improved. rod puller can best be brought out by a brief discussion of the manner in which the device functions when employed in the bracing of a form for a concrete mold.

In constructing large concrete structures such as dams or the like, -the structure is cast in sections, each lower section represented by the secmetrically positioned lugs 22. extend from the surface of the outer member 1. A portion 23 of the outer member is of reduced cross section. This portion has formed about, the periphery thereof a plurality of ratchet teeth 25. A flange ring 21 is mounted about the outer member 1 at a location adjacent the ratchet toothed portion 23, this ring providing a bearing surface for one face of a ratchet handle 29, which encircles the ratchet toothed portion of the outer member. This handle is provided with a concealed pawl in the forfn' of a spring biased pin 3|, whose ratchet engaging end 33 is of reduced section and haped tion 5| of Figure 4, serving as a support for the form walls" 53 which make up the mold for the adjacent upper section to be poured. The form wall is bolted to the lower section 5| by bolts 55 engaging threaded sockets which have previously been embedded in the. face of the section during pouring. The wall is then braced in preparation for the pouring of the mold. This is accomplished by jamming a pipe or the like 59 between the lower section 5| and the form wall 53, then tensioning a rod 6| which is anchored at one end in the lower section and extends through the form wall. When properly tensioned to assure suflicient rigidity of the wall for pouring purposes, a collar 63 is preferably aflixed to the rod adjacent the outer surface of the wall.

In utilizing my improved rod .puller for the purpose, the collar 63 is first slipped over the rod 6| and the free end of the rod is threaded through the rod puller. With the fitting 4| bearing against the collar 83, the cam lever I] is .rotated to cause the teeth 2| to bite into the rod and clamp'the same against withdrawal. Operation of the ratchet handle 28 will then cause rotation of the outer member I, with a consequent unthreading of the inner member I to' thereby tension the rod. The efl'ort required for this is lations orthe ratchet handle, the scalloped collar.

It enables one to hold the outer member I against oscillating with the movements of the handle, should such tendency exist, until the load on the device becomes sumcient to render further holding unnecessary.,

when proper tension has been placed on the rod, the collar 63 is fixed thereto by a set screw II, following which, removal of the rod puller for further use elsewhere is permitted. In removing the device, it is given a few turns in reverse with a suitable spanner wrench in engagement with the lugs 22. This relieves the device of all stress from the rod under tension, enabling the cam lever II to be lifted out of engagement with the rod, thus freeing the entire device.

While I have described one embodiment of my inventionin detail, I do not desire to be limited in my protection, to such details, except as may be required by the prior art and annexed claims. I claim: 1. In a rod puller of the type comprising a pair of concentric members, one threaded within the "other and adaptedupon relative rotational move- -ment. to unthread itself and thereby increase the overall length of said puller; an outer concentric member having an end section of reduced di- :ameter and provided with an abutting shoulder adjacent the inner end of said section; a plurality of ratchet teeth disposed about said section of reduced diameter over only a portion of the length thereof and terminating short of the outer end of said section, leaving an end portion devoid of teeth; a ratchet handle having a ring head snugly encircling said toothed portion of said section, and a handle depending therefrom,.said handle having a spring pressed radially disposed pawl protruding therefrom into pressure engage- .ment with the toothed portion of said section of reduced diameter; and a collar afllxed to the end of said section to hold said ratchet head in abutment against said shoulder, said collar having a diameter greater than that of said outer concentric member and its edge scalloped to provide for manually gripping of the same, to retain said outer concentric member from undesired rotational movement during resetting strokes of the ratchet handle 2. In a rod puller of the type comprising a pair of concentric members, one threaded within the other and adapted upon relative rotational movement to unthread itself and thereby increase the overall length of said puller; an outer concentric member having an end section of reduced diameter and provided with an abutting shoulder adjacent the'inner end of said section; a plurality of ratchet teeth disposed about said section of reduced diameter over only a portion 'of the length thereof and terminating short of the outer end of said section, leaving an end portion devoid of teeth, said end portion being threaded; a ratchet handle having a ring head snugly encircling said toothed portion of said section, and a handle depending therefrom, said handle having a bore therein terminating in the interior surface'of said head; a spring pressed pawl in said bore and protruding therefrom into pressure engagement with the toothed portion of said section oi. reduced diameter; and a collar threaded to the threaded end of said section to .hold said ratchet head in abutment against said shoulder, said collar having a diameter greater than that of said outer concentric member and its edge scalloped to provide for manually gripping of the same, to retain said outer concentric member from undesired rotational movement during resetting strokes of the ratchet handle.

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