US1238695A - Tie or spacer. - Google Patents

Description

efs. MUMFORD.

TIE 0R SPACER.

APPLICATION FILED JUNE 15,1911.

Patented Aug. 28, 1917.

ATITORIVEV G-URDON S. MUMFOBD, 0i? GARDEN CITY, NEW YORK.

TIE OB SPACER.

Specification of Letters Patent.

Patented Aug. 2%, lltliW.

Application filed June 15, 1917. Serial No. 174,939.

To all whom it may concern:

Be it known that l, GURnoN SALTONSTALL MUMFoRn, a citizen of the United States, and resident of Garden City, in the county of Nassau and State of New York, have invented certain new and useful Improvements in Ties or Spacers, of which the following is a specification.

lhis invention relates to ties and spacers for molding apparatus particularly adapted for use in concrete construction work, but it is susceptible to other applications with slight modification.

It is well known that in practically all of the tie devices known to the prior art in which a threaded member engages a female thread,

such as turnbuckles, threaded couplings, and the like, the connected members come to a full stop and the body of the coupling must transmit the strain through its own section, practical to thin the body of the coupling member after the critical center section is passed, the thickness of the Walls of the coupling or turnbuckle are determined by the thickness required in the middle. In some classes of work viz.'where strain is not applied until after the connecting members are bolted this limitation makes for weight and waste material. Again from the very nature of a cut thread such as is found in the prior art and common practice it is impossible to successfully make such threads without a certain amount of clearance being allowed for the engagement of the bolt member, which precludes any jamming action in the female thread which would tend to prevent the Working loose of the bolt from vibration or other causes. In all concrete work it is desirable to have aslittle metal in contact with the outer surface of the wall as possible. all tie members that remain in the Wall are pure waste from and the element of cost is a vital one. Further, the process of stamping and certain forms of spot-welding are the cheapest manufacturing processes known.

With this brief statement of'present conditions in mind, one of the ob ects of the present invention is to provide a simple and practical spacer and tie particularly adapted for use in or with forms for erecting concrete Walls'and buildings or the like. A further "object is to provide a tie containing female threaded members in which the in its entirety. As it is not Also in concrete worka structural point of view thread or its equivalent is formed by a stamping process instead of being cut in the metal, thereby permitting a great saving in the thickness of the metal required and also a saving in the cost of fabrication. A further object is to provide a tie containing female threaded members of such character thatrthrough variations in the thread a jamming action against the thread of the coacting bolt or male thread may be obtained. A further object is to provide a tie member formed integral with a female, threaded member in such fashion that the strain from the tie member is transmitted in increments or little by little to the female threaded member throughout its whole extent. A further object is to ,provide an economical tie member susceptible in manufacture of great variation in length, but in which the femalethreaded members are connected integrally with the tie portion when manufactured, thus eliminating mistakes, loss of time and labor, and making for standardization. A further object is to provide a. spacer of maximum stiffness for the material used. A further object is to provide a spacer with a minimum amount of material in contact with the outer surface of the wall. A further object is to provide a spacer which is also a tie member. A further object is to provide a tie member for concrete forms which will on the completion of the Work aflord permanent anchorages of great strength. A further object is to provide a tie member of such character that the coacting bolts have their threaded portions protected from contact with the concrete or plastic material.

Other objects will be in part obvious from the annexed drawings'and in part indicated in connection therewith by the following analysis of this invention.

The invention accordingly consists in the features of construction, combination of parts and in the unique relations of the members and in the relative proportioning and disposition thereof, all as more completely outlined herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the same by the numerous modifications in structure and relation contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure, and in such drawings, like characters of reference denote-corresponding parts throughout all the views, in which I Figure 1 is a transverse view partly in section of the apparatus together with the side mold frames.

Fig. 2 is a sectional elevation of the apparatus taken. along line 2, 2, in Fig. 1.

Fig. 3 is a longitudinal sectional view taken along -line.3, 3 in Fig. 2.

Fig. 4 is a planview of one of the intermittent, stamped thread corrugations.

Fig. 5 is a sectional view along line 5, 5 in Fi Fig. 6.is an elevational view showing a modification of the invention.

Referring now to the drawings in detail and more particularlyto Fig. 1, 6, 6 denotes the body portion of the device and consists of two relatively straight pieces of metal preferably steel wire of a circular section. These body members 6,6 are welded by the process known as spot welding .to the terminal members 7, 8. These terminal members 7, 8 are also spot welded together along and through their flat surfaces denoted by 9 Thus the members 6, 6, 7, 8, become one solid body to all intents and purposes homogeneous and integral in the shape shown after fabrication.

Members 7, and 8 are cut and stamped from a sheet of relatively thin metal, prefer ably sheet steel. They are shaped into one large and two smaller semicircles as shown in Fig. 2. The large semicircular section has also stamped corrugations or indentations 10, 11 about its periphery. When members 7, and 8, are welded together as shown, these stamped corrugationsform an intermittent thread which is adapted to receive a threaded member, the bolt 12.

The stamped corrugations 10, are of a plain rectangular section, and so spaced as to ive the usual clearance for the coacting maIe or bolt thread but the corrugations 11,- preferably placed at the inner end of the socket members 7 and 8, are of a wedge shaped section, Figs. 4, and-5. The effect of these corrugations 11 is to jam' the bolt thread. The action of screwing in the bolt forces the bolt thread between the -corruga-. tions or indentations 11, and forces the projecting angular points 13 slightly back on themselves, The reaction of the corrugations 11 in'this manner gives a hard and fast grip on the bolt thread 14 which prevents any working loose of the bolt through vibration.

' It is readily seen that the great latitude of design and ease of the stamping process renders it ractical and possible to fabricate a self locl ing thread of this character. It is also seen that due to the construction of this device, the body members 6, 6 transmit their Strain evenly all along the periphery of the socket members 7, 8. This enables the walls of the socket members 7, 8, to be very thin, which not only makes for economy, but also makes it possible to stamp the necessary corrugations 10, 11. Transverse shearing across the bolt member would not affect the efficiency of the socket members 7, 8. Shearing along the flat-surfaces 9 is resisted by the double thickness of metal and is readily prevented by merely lengthening the longitudinal dimension of the socket members 7, 8; which does not in the least affect the ease of fabrication or economy of the stamping process. In the manufacture of this invention, the body members 6, 6 are cut to length,

the socket'members 7, 8 are stamped out in large quantities, and the whole assembled and spot welded as required. In all other threaded devices known to the prior art, it is necessary to thread the article after it has :been cut to length, but in this invention the threaded portion is prefabricated and applied to cut body members in a very speedy manner. This makes for standardization and great economies in manufacture.

Referring back to Fig. 1, there is shown the inventionas applied to tying and spacing concrete molds together before the casting of concrete. In this case it will be noted that the outer ends of the receiving socket members 7, 8 project beyond the connection with the body members 6, 6. This is for the purpose of keeping these portions as far from the surface of the finished wall as possible, so that there will be a minimum of metal at the wall surface. It will also be noted that because of the distance of the body members 6, 6 one from the other the device has a relatively large radius of gyration and. is therefore very stiff and is highly efficient as a spacer. The rigid condition of the ends of the body members 6, 6 due to welding also adds to this value. The complete inclosing of the thread of the coacting bolt member 12, tends to "prevent the rusting of the bolt threads. From the shape of the device it is seen that after the concrete is placed the invention here shown has great value as a permanent anchorage, as its resistance to dis placement is entirely independent of the adone piece. bent back on itself to the receiving socket 7, 8, which is adapted to receive a threaded member 12: The uses to which the invention as shown in Fig. 6 may be applied lit) , loss.

' in manufacture and vents any in connection with concrete molding apparatus are so varied and so obvious that it is not believed necessary to describe any specific application.

From the above description it has been seen that this, invention boards 15, Fig. 1 at a predetermined dis tance from each other, that it ties them together securely, that it acts as a permanent anchorage of great strength, that there is a minimum of material in contact with the outer surface of the wall, and that the bolt member is prevented from contact with the concrete. It is also seen that this invention substitutes a cheaply stamped fabrication for expensive out threaded devices in that portion of it which must be a permanent It is further seen that the corrugated or indented thread of irregular section permits a self locking thread action which preworking-loose of the coacting bolt members. It is also apparent that'this in-, vention is capable of great standardization hence that it is extremely economical. It is further evident that the maximum of strength is obtained with a minimum of material as wire is the cheapest form of steel and the strongest in proportion to its cost, and the socket members from their very nature-must be of the thinnest sheet steel.

While only a few of the numerous applications of the present invention have herein been illustrated and described, it is believed that numerous others will occur to those familiar with the art and the invention is not to be limited to the specific applications herein shown.

From theabove it will be seen that the invention is simple and practical in construction, cheap to manufacture and install, in short, is adapted to accomplish, among others, all of the objects and advantages herein set forth.

Without further analysis, the foregoing will so fully reveal the gist of this inven tion that others can by applying current knowledgereadily adapt it for various applications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalency of the following claims.

holds the mold I claim: V

1. A unit for concrete work comprising a body portion consisting of two relatively straight members joined integrally at their ends by socket membersadapted to receive coacting-threaded bolt members.

2. A tie for concrete structures comprising a body portion including two relatively straight members joined integrally at one end by a socket member adapted to receive a coacting threaded bolt member.

3. A unit for concrete Work comprising a body portion consisting of two connecting members joined integrally at their ends by socket members, said socket members having projections arranged about their central periphery in such a manner as to form a helix or thread adapted to receive coacting threaded members.

4. A unit for concrete Work comprising a body portion consisting of two connecting members joined integrally at their ends by socket members, said socket members having indentations arranged about their central periphery, said indentations being non-continuous and formed in isolated units in such a shape and position as to exert a locking or retaining action on the thread of the coacting threaded members.

5. A unit for concrete work comprising a body portion consisting of two connecting members joined integrally at their ends by socket members, said socket members having indentations arranged about their central socket members having indentations arranged about their periphery in such a manner as to form a helical thread adapted to receive threaded bolt members.

Signed at New York, in the county of New York and State of New York this fourteenth day of June A. D. 1917.

GrURDON S. MUMFORD.

Witnesses:

LILLIAN GULBRANSEN, HOWARD J. MANDELL.

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