US2673066A - Jack for elevating forms and floors during the pouring of concrete - Google Patents

Description

H, H. NORMAN. 2,673,066 JACK FOR ELEVATING FORMS AND FLOORS DURING THE POURING OF' CONCRETE 3 Sheets-Sheet l.

m@ Nm www N March 23, 1954 Filed Nov. 15, 1950 INVENTOR. HAR/'e Y H. NORMAN BY WTO/F/Vlfy-5` Mrch 23, 1954 H. H. NORMAN 2,673,066 JACK FOR ELEVATING FORMS AND FLOORS DURING THE POURING OF' CONCRETE Filed Nov. 15, 1950 3 Sheets-Sheet 2 /04 05 Sl |||l so es /08 /08 89 'Il I 89 aa 90 9o i INVENTOR. 8@ 65 HARP Y H. NORMAN |03 l, JOZ By a7 19 Quid.

TTOlQ/VEXS March 23, 1954 H H," NORMAN 2,673,066

JACK FOR ELEVATING FORMS AND FLOORS DURING THE POURING OF' CONCRETE y F'lled Nov. 13, 1950 3 Sheets-Sheet 3 Eff INVENTOR. HARRY H. NORMAN Bvb/MM A TTRNEYS Patented Mar. 23, 1954 JACK FOR ELEVATING FORMS AND FLOORS DURING THE POURING F CONCRETE Harry Harold Norman,

to Minot Builders Sup tion of Minnesota Superior, Wis., assignor ply Co., Inc., a corpora- Application November 13, 1950, Serial No. 195,417

My invention relates to jacks `for elevating forms and doors during the pouring of concrete rand has for its object to provide free and loose dog members engaging an abutment with one end and having a bit member to engage with its :sharpened edge the side of a `rod called a jack rod which is embedded in and rigidly held by the concrete as it is poured.

In practice the arrangement operates in connection with a two-part elevating member, the parts of which are separated by the introduction of compressed air between them, in combination with which are two sets of clamping bits, one of which holds one of the members stationary by engagement of the bits with the jack rod dur- `ing the lifting operation, and the vother of which holds the other member stationary while the `second member is restored to initial relative positionwith the lifted member.

Free bit members unattached directly to any part of the lifting members are `held by springs to engage the jack rod while the lifting action is effected by upward movement of one of `the parts of the lifting member `and which hold the other part stationary when the lifted part is restored to initial position is the invention of Roy I. Patterson, `whose applications Ser. No. 87,632 and No. 151,060 are pending in the Patent Oilice and have been assigned to the assignee of my invention.

I have discovered a novel manner of mounting the bits and holding them with springs, which is in a high degree eilicient and dependable and which simplies and renders more advantageous the 'free bit struoturein the following particulars:

Two springs instead of one spring are mounted so as to exert the force of both springs uniformly across the body of the bit, thus insuring irlcreased power of pull on the bit and uniform distribution of pull.

The springs are so `mounted that they exert their pressure upon the bits in a plane nearly parallel to the axis of the jack rod, thus having a much more powerful torque of pull upon the swinging bits.

Radially extended parallel channel members are formed on the lower one of the movable litfer members and the springs are attached to transverse ribs extending between the channel members, said ribs all lying at the same radial distance from the center of the jack rod when the lifting device is positioned thereon. The ribs for 'one `set of bits extend outwardly a considerable less distance than the ribs for the other set of bits.

4 Claims. (Cl. 25d- 106) The springs areconnected to the members outwardly extending from the sides of the bits by means of a loop of the spring material. having a gap so that the springs can be readily andeasily disconnected from the bits and the bits removed for sharpening, repair or exchange.

Although the springs operate `upon setsof Vbits of different lengths, all of the springs 4mounted in the above manner are ofthe same length which makes possible the use of a single length of vsprings for all of the bits. i

It is an object of my invention, therefore, `to employ for holding the bits two springs mounted in parallel relation and connected to ribs on the lower plate of the lifting device, which are of different lengths but lie substantially in a circle.

it is a further object of my invention to Vhave radially extended channel members formed on the lowei one of the movable lifter `members and to have transverse ribs secured to 4and between the channel members, the ribs for one set of bits extending outwardly `a considerable less distance than the ribs of the other set of bits.

It is a further object of my invention :to `provide pairs of springs connected to each of the several ribs, each of said pairs of springs extending outside of a clamping bit and being connected to members rigidly secured to the clamping bit and extending transversely outside the limits thereof.

It is a further object of my invention to have the pairs of springs employed for each clamping bit connected to a transverse rib `at one end and connected to the bits by means of a loop of the spring material running about members extended laterally from the sides of the clamping bit, said loop having an `opening whereby the springs may readily be released from the bits andthe bits withdrawn for sharpening, repair or renewal. n

It is a further and important object of my invention to form the springs for all of the bits of exactly the same length even though one set of `bits is longer than the other set.

The full objects and advantages of my invention will appear in connection with the specieation hereinafter appended, andthe novel features of the invention by which the advantageous and useful results above noted are `obtained will be particularly pointed out in the claims.

In `the drawings illustrating an application of invention in one form. i

Fig. `1 is a diametrical sectional elevation View of a lifting device with my `invention applied .interior wall I2.

thereto showing relations of the bits, springs and the two members making up the lifting device.

Fig. 2 is a sectional plan view viewed from below taken on line 2-2 of Fig. l.

Fig. 3 is a sectional detail elevation view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional elevation view similar to Fig. 3 taken on line 44 of Fig. 2.

Fig. 5 is an underside plan view of the lower plate of the lifting device.

Fig. 6 is a sectional view taken on line 6-5 of Fig. 5.

As shown in Fig. 1, the pneumatic lifting device has a top or upwardly moving member I9 which includes a top annular depending flange I I which is circular and is provided with a cylindrical The member I9 also has integrally connected therewith a depending sleeve I3 which surrounds a jack post I4 rigidly held in a vertical position in the concrete being poured, not shown. The sleeve I3 has its inner wall ground to true circular form and is of such a length that the upper member I9 of the pneumatic lifting device will at all times be held vertical to the axis of the jack rod I4.

Formed on the flange l I are a series of depending socket members I5, I6 and I1 which form abutment seats for bit members I8, I9 and 29.

A second set of bit members 2i, 22 and 23 are fulcrumed against a depending flange 24 of the second member 25 of the pneumatic lifting device. The member 25 is formed with a flat upper surface 26 and an opening 21 through the sleeve I3 adapted to surround and embrace the jack rod I4, and guide and hold it in its vertical movements along the jack rod.

As viewed in plan, the longer set of bits I3, I9 and bear at their ends against the abutment ends 28, 29 and 39 upon the ends of socket members I5, I6 and I1. 23 bear against the downwardly extending flange 24 at 3I, 32 and 33 respectively, as clearly appears in Fig. 2.

Directly below and having their inside walls substantially in the planes of the side walls of bits I'8, I9 and 20, are pairs of radially disposed ribs 35 and 36, 31 and 38, and 39 and 49, which are rigidly connected to the bottom wall 4I of pneumatic lifter member and also are connected with the downwardly extending ange 24 of lifter member 25.

Upon the top surfaces 26 of lifter member 25 is positioned an annular sealing plate 42 which is provided with an inner annular flange 43 taking against the outer wall of the sleeve I3. The

sealer member 42 further has an outer annular ange 44 which takes against the annular wall 4'5 of the ange I2 of the top pneumatic lifting member I9. There is thus formed an annular chamber 6I between the two members of the pneumatic lifter devices I0 and 25.

In a similar manner the bits 2I, 22 and 23 lie inside the planes of pairs of spaced ribs running at their tops into the horizontal plane of the bottom of flange 24, which last named ribs are designated 46 and 41, 48 and 49, and 59 and 5I respectively. These ribs are spaced apart a distance substantially equal to the diameter of the jack rod I4 as is true of the pairs of ribs 35 and 36, 31 and 38, and 39 and 49. The sets of ribs 46 and 41, 48 and 49, and 50 and 5I, come opposite outwardly extending lugs 52, 53 and 54 formed integrally with and extending at their bottoms in the plane of the bottom flange 24 of the lower pneumatic lifter member 25.

The shorter bits 2|, 22 and The arrangement of these sets of ribs is such that there are six sets of them each extending radially and each angularly separated the same distance, the sets of ribs 35 and 36, 31 and 38, and 39 and 43 alternating with the sets of ribs 46 and 41, 48 and 49, and 5B and 5I.

Ribs 36 and 41 are connected toward the middle of their lengths by an arcuate member 55. Similarly ribs 35 and 49 are connected by an arcuate member 55, ribs 31 and 49 by an arcuate member 51, ribs 33 and 59 by an arcuate member 58, ribs 39 and 5I by arcuate member 59, and ribs 46 and 46 by an arcuate member 69. The arcuate members 55, '56, 51, 58, 59 and 69 taken together outline a circle and have the effect with the pairs of radial ribs, above dened, of giving great strength to the bottom pneumatic lifting member 25.

The lower surface 62 of the top pneumatic member I9 is spaced a .very small distance from the top surface of annular sealer member 42, as indicated at 63 in Fig. 1. However, the annular chamber 6I is widened at its outer limits, as indicated at 64 and 65 in Fig. 1, and into this annular chamber and the space between bottom 62 and sealer plate 42 compressed air may be controllably injected through opening 66 connected with a suitable hose, from a container of compressed air and valve means for permitting periodic injection of the compressed air into the annular chamber 5I. This air injecting means is of common and well known construction and, therefore, is not shown.

It will be apparent, however, when air under pressure is admitted through opening 66 into compressed air chamber 6I it will be distributed uniformly over the annular sealing member 42 and will force outwardly its respective flanges 43 and 44 and thus seal the chamber tight against leakage.

The injection of compressed air into chamber 6I will result in expanding the chamber 6I and, because the bits I8, I9 and 20 hold the lower member 25 from downward movement, the expanding of chamber 6I must effect upward movement of the upper pneumatic lifting device II] which lifts with it the iioor and form structure supported on its upper surface, not shown.

As shown in Fig. 1, screwed into a threaded opening 51 in flange II of top pneumatic lifter member I9 is a bolt or rod 58 having on its lower end a head 69. The bolt 66 goes freely through an opening 19 in lug 54 on the lower pneumatic lifter member 25 and thus will be constrained to have the vertical movements which the top pneumatic lifter member I9 has and to be movable relative to the bottom lifter member 25 through the opening 1G. Bolts 1I and 12 are similarly mounted to move freely through lugs 52 and 53.

The lugs 52, 53 and l54 have arcuate ends and are mounted to have free vertical movement within recesses 13, 14 and 15 in the fiange member and the extension 16` thereof, as clearly shown in Figs. 1 and 2.

About each of bolts 68, 1I and 12 are mounted sleeves 11, 18 and 19 which are rigidly connected with the respective lugs 54, 52 and 53. The lower ends of the sleeves 11, 18 and 19 are spaced from the bolt heads B9 a suitable distance, as indicated at 86 in Fig. 1. It follows that as the two pneumatic lifter members I0 and 25 are separated by air pressure if, as is the fact,(the lower member 25 is restrained from downwardA movement by bits 2l, 2 2 and 23, the movement must be imparted to the upper 'pneumatic lifter member lll.

This will carry upwardly all the bolts '68, 'H and :'12 movable within `the sleeves Tl, 18 and ls, lifting the bolt heads Sil with the bolts and comn pressing springs Si on the bolts between the re spective lugs iid, di. and When, therefore, the pressure is released, letting the air escape, the upper pneumatic `lifter member it will be held stationary by the dogs it, it and iz@ and the springs Si, acting in consort, will `push the lower pneumatic lifting member 25 upwardly to initial position.

This operation will normally lift the top mem- `ber IIl and the parts carried thereby `a very small distance each time the air pressure is applied and released. In practice it has been found eifective to have this distance from onenfcurth to three-eights `of an incl'z. It follows that rapid repetition ci the lifting operation will soon produce an over-all lift through any Adesired distance.

A plate 82, Fig. l, preferably of a substantially `lfieavy steel, has a central opening t3 by which Ithe plate is mounted upon the jack rod i4. Other openings et, as indicated in Fig. 1, receive the bolts tid, 'il and l2 so that the plate will then rest upon the bolt heads te. When in that position the plate 82 anchors the bolt heads to the jack rod M and eil'ectively prevents any rocking or swinging thereof which might put sufiicient strain on Veither the iiange ii or the bolts 68, 'H and "l2 to cause breakage. This' breakage is `very effectively prevented by the plate 32' mounted as stated.

The two sets of bits it?, i9, 2t, and 2i, 22, 23, respectively, are each provided with pins ill whose opposite ends t5 and at are shown projecting outwardly in opposite directions from the planes of the sides of the bits. Member Sl is welded or otherwise permanently secured across the bottom faces of bits i8, it `and 2li, 2l, 22 and 223.

Each bit of either type has connected therewith two springs its and te which extend outside of and along the side faces of the bits, as clearly shown, in Fig. 2. At the opposite ends of each spring are loops il@ and Si. At least the loops 9) have a gap 92, as indicated in Fig. l, which is of suiicient width to permit the loops 9o readily to be withdrawn from the projections at and 85 to permit quick and easy removal of the bits.

.As shown in Fig. 5, there are two sets of transverse ribs between the sets oi" respective ribs 35 and 35, :il and 33, and d@ and iid; and the other set of ribs d@ and ill, lli and t9, and tu and El. The transverse ribs for the first set are designated 93, @It and The transverse ribs for the second set are designated as 9S, Si and t8. As clearly shown in Fig. 1, the transverse ribs 93, lili and t5 come out substantially into the plane of the bottom of the flanges 99 and 2d and of the annular sleeve S9 formed integrally with pneumatic lifting member As clearly shown in Fig. l, the transverse ribs 9B, 97 and tt project onlyT a short distance from the lower plate iii. The sets oi springs 88, t9 for the longer bits I8, i9 and 2li are connected to longer ribs Q3, (it and while the sets of springs for the shorter bits 2l, 22 and 23 are connected to the shorter ribs 95, 91 and et.

Thus, although the shorter bits 2l, 22 and 23 engage with their edges it, the jack rod at a point closer to the pneumatic lifting member 25 .6 than the :point of engagement of the :edges flll of the longer bits i8, I9 :and 120 with the jack rod, the above arrangement 4enables `springs `of the same length to `be employed.

The connection of the springs `with the `bits and the transverse ribs is well `shown `in the deh tailed Figures 3 and 4. In both cases the spring loops of the springs 83 and 89 lie .in planes parallel with the side walls vICH and. ,H23 of `the bits It, it and 2t, while similar loops |04 and los are in similar planes connected. through openings It@ and itl in transverse ribs 93 (the` same in connection and e8).

As shown in Figs. 1 and 4, vthe ribs `46, `4l, 48, 49 and 5t, 5l are cut out part way down, as indicated at liil, to permit the springs `8l) and till to move in toward the tops of the reduced transverse ilanges 96, Ell' and 98.

lIn Fig. `2 the sharpened edges of the dogs I8, I9 and 2t which engage jack rod l are indicated Yby numeral |99. Similar edges H30 of the bits 2li, 21| and 22 are provided for engaging jack rod hi at a higher point thereon.

The advantages of my invention will be `apparent from the above description. A principal advantage comes from the use of two springs for each bit connected at the two sides of the bit over projecting members, which as shown,` are the ends se, tti of transverse cylindrical members preferably welded to the bottom face of the'dogs. This insures a very powerful pull from the two springs distributed throughout the width `of the bit, and holds the sharpened ends oi? the bits at the proper angle to engage the jack rod.

Another great advantage resides `in the fact that the connection of the springs to full length and shorter transverse ribs on the lower one of the two pneumatic lifter members, one set oi' ribs being of greater depth than the other set makes possible the use of uniform springs of the same length.

A further important advantage from the `above form of attachment is that it enables the springs to be extended very nearly at right angles to the lengthwise extent of the bits, thus greatly increasing the torque pull of the bits against the jack rod.

Iclaim:

i. In a jack for elevating forms and iloors during the pouring of concrete, a jack rod along which the jack is adapted to move, a two-part pneumatic lifting member including an. upper part having a depending flange forming within it a chamber and a lower part therein movable along said flange, said lower part being formed with two sets of separated pairs of substantially radial ribs spaced apart, a transverse flange between each pair of ribs of one set extending to the top plane of said radial ribs and forming an abutment therebetween on the lower member, a flange between each pair of the second set of radial ribs extending only part way to the tops of said radial ribs, each of said :flanges of both sets having formed therein two suitably positioned openings the upper member having downwardly extending parts forming abutments, two sets of clamping bits each free from permanent attachment to any part of the jack, the bits of one set adapted to have one end engage in abutment on the lower lifting part and the bits of the other set adapted to have one end engage an abutment on the upper lifting part, the other ends of all the bits being sharpened for engagement with the jack rod, members secured to the with transverse ribs 96, 9:1

.lack rod.

2. In combination with a vertically extending jack rod, a jack comprising a first plate surrounding said rod having an annular depending flange on the outer lateral limits forming a chamber in the lower surface of said plate, a second plate surrounding said rod and formed to fit within the chamber of the iirst plate with its top surface substantially contiguous to the bottom surface of the first plate, a resilient connection extending between said rst and second plates and forming a follow-up connection between said plates, two sets of clamping bits supported beneath said plates having sharpened ends engaging the jack rod, one of said sets extending from the depending flange of the first plate to anchor Said plate to the jack rod during relative movement of the second plate, the other of said sets extending from the second plate to the jack rod to anchor said plate to the jacl; rod during relative movement of the rst plate, projections extending laterally from each of said bits adjacent their sharpened ends, fianges depending from the lower surface of the second plate, and two springs extending between the projections on each bit and the anges on the lower surface of the second plate and in a plane nearly parallel to the axis of the jack rod to bias the sharpened ends of the bit against the jack rod.

3. In combination with a vertically extending jack rod, a jack comprising a rst movable member encompassing the jack rod, a second movable member encompassing the jack rod beneath the first member, said rst member being movable relative to the second member, a resilient connection extending between said first and second members forming a follow-up connection between said members, two sets of clamping bits supported beneath said members having sharpened inner ends engaging the jacl; rod, one set extending angularly from each of said members to anchor the respective member to the jack rod during relative movement of the other member,

projections extending downwardly from the sec-'- ond movable member adjacent each of the clamping bits, and a pair of springs extending from either side of each of said clamping bits adjacent their sharpened ends to said projections and in a plane nearly parallel to the axis of the jack rod to bias the sharpened ends of the bits against the jack rod.

4. In combination with a vertically extending jack rod, a jack comprising a first plate surrounding said rod having an annular depending flange on the outer lateral limits forming a chamber in the lower surface of said plate, a second plate surrounding said rod and formed to t within the chamber of the rst plate with its top surface substantially contiguous to the bottom surface of the rst plate, a third plate surrounding said rod and spaced below the second named plate, a plurality of headed guide rods depending from the annular flange of the first plate penetrating the second plate and the third plate with the heads engaging the lower surface of the third plate, a spring on each guide rod extending between the third plate and the second plate and biasing the second plate in the direction of the first plate, a first set of clamping bits having sharpened ends extending from the annular flange of the first plate to the jack rod above the third plate, a second set of clamping bits of shorter length than the first set having sharpened ends and extending from the bottom surface of the second plate to the jack rod above the third plate, projections extending downwardly from the second plate adjacent each of the several clamping bits, and a pair of springs extending from either side of each of the clamping bits adjacent their sharpened ends to said projections and in a plane nearly parallel to the axis of the jack rod to bias the sharpened ends of the bits against the jack rod.

HARRY HAROLD NORMAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,528,857 Strandberg et al. Mar. 10, 1925 1,649,674 Egan Nov. 15, 1927 2,016,575 Nemec et al. Oct. 8, 1935 2,227,394 Lucker Dec. 31, 1940

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