US2891758A

US2891758A - Timber holder

Info

Publication number: US2891758A
Application number: US501116A
Authority: US
Inventors: Jr Lawrence S Holmboe
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-04-13
Filing date: 1955-04-13
Publication date: 1959-06-23
Anticipated expiration: 1976-06-23

Description

June 1959 1.. s. HOLMBOE, JR 2,891,758

TIMBER HOLDER Filed April 13, 1955 12 I I IO I I 2 'lmlllh l g a M LVWJ F165. l FIG. 2 F166 INVENTOR- United States Patent Ofifice 2,891,758 Patented June 23, 1959 TIMBER HOLDER Lawrence S. Holmboe, Jr., Oklahoma City, Okla.

Application April 13, 1955, Serial No. 501,116

2 Claims. (Cl. 248-357) The present invention relates to the construction of buildings, and the like, and more particularly to a timber holder or inter-connector in the supporting of scaffolding, concrete forms, staging, and the like, as used in connection with construction work.

As is the practice in constructing forms for concrete in building bridges, buildings, etc., a sturdy support must be provided to hold the concrete. The horizontal supporting cross-members are referred to as purlins and the vertical supports are referred to as shores.

The principal object of the present invention is to provide a means for holding the upper end of a shore in place adjacent the under side of a purlin to prevent lateral movement of the shore relative to the purlin.

A similarly important object is to provide a means for holding the upper end of a shore in position relative to the purlin when the purlin has been raised from contact with the upper end of the shore.

Another object is to provide a means of connection between a shore and a purlin which may be made by only one workman from the ground floor.

A further object is to provide a means for connection between a shore and a purlin without nailing a sea or short dimension of lumber, on the connecting members.

An additional object is to provide an inter-connector or timber holder which is light and simple in construction, yet strong and sturdy and comparatively cheap to manufacture.

Yet another object is to provide an inter-connector which may be easily attached to and removed from the upper end of a shore.

The present invention accomplishes these and other objects by providing a pair of elongated substantially fiat members of resilient material which are substantially straight throughout substantially one half their length and are perforated intermediate the ends of the straight portion for being rigidly connected in parallel longitudinal relation to opposing sides of the upper end portion of a shore, as by nailing. The free end portions of the members extend upwardly above the upper end of the shore and are arcuately curved to substantially describe an S- shape for co-operatively frictionally engaging opposing sides of a purlin therebetween.

Other objects will be apparent from the following description when taken in conjunction with the accompanying one sheet of drawings, wherein:

Figure 1 is a perspective view of one of the devices, per se;

Figure 2 is a fragmentary elevational view of a pair of the devices installed on a shore and illustrating, in dotted lines, the connecting action of the devices with a purlin, the purlin being shown in cross-section;

Figure 3 is a fragmentary side elevational view of the installation of Fig. 2;

Figure 4 is a horizontal cross-sectional view of one of the devices taken substantially along line 4-4 of Fig. 3;

Figure 5 is a fragmentary elevational view similar to Fig. 2 illustrating a shore connection with a purlin which is laterally wider than the shore, the shore and purlin being shown in dotted lines.;

Figure 6 is a fragmentary elevational view similar to Fig. 5 illustrating a shore connection with a purlin which is laterally narrower than the shore, the shore and purlin being shown in dotted lines.

Like characters of reference designate like parts in those figures of the drawings in which they occur.

In the drawings 2 Referring more particularly to Fig. 1 the reference numeral 10 indicates one of the devices, per se, which is an elongated strap-like member preferably of resilient material.

The device 10 is rectangular in cross-section in its preferred embodiment but may well be circular, elliptical or of any desired shape. As shown it is transversely flat between its edges. The member 10 is substantially straight for substantially one half its length as at 12. At a point intermediate its ends the member 10 is arcuately curved away from the plane of the straight portion 12, as at 14 then curved back and across the plane of the straight portion forming a reverse curve, as at 16, and then reverse curved, as at 18, in the same direction as the first curve 14 to its end 20, thus forming substantially an S-shape for substantially one half the length of the member. In the usual parlance the shape is referred to as a flat S. The curve 16 and the end 20 lie on one side of the plane of the straight portion 12 and the reverse curve 18 lies on the opposite side of the plane of the straight portion for the purposes more fully explained hereinbelow.

Longitudinally disposed on the curved portion 18 are preferably two parallel comparatively short substantially V-shap'ed ridges 22, see Fig. 4, integral with the member 10 for the purposes which Will presently be apparent.

Adjacent each respective end of the straight portion 12 the member 10 is through perforated, as at 24 and 26. The size of the perforations 24 and 26 is such that they freely receive a nail or the like for connecting the straight portion 12 flatly to a shore.

Referring now more particularly to Figs. 2 and 3, the reference numeral 30 indicates the lower one and the numeral 31 indicates the upper one of a pair of vertically disposed shores with the shore 31 held in vertical slidable relation with the shore 39 by a pair of shore clamps 33 and 34. The shores 30 and 31 are of conventional four by four size cross-sectionally of any desired length with the shore 31 disposed below a purlin 35 of equal crosssectional area with relation to the shores. One of the members 10 is connected to each of a pair of opposite sides of the upper end portion of the shore 31 parallel with the vertical sides of the purlin 35, forming a cooperating pair of the members 10, which is the preferred arrangement. Each member 10 is longitudinally disposed centrally of its respective side of the shore 31, see Fig. 3, with the curve 14 in close spaced relation below the upper end 36 of the shore 31 and with the ends 20 disposed outwardly from the sides of the shore. The members 10 are rigidly held in this position by double headed nails 37 driven into the shore through the perforations 24 and 26, respectively. The use of double headed nails facilitates the removal of the members 10 from the shore. Each member 10 projects beyond the end 36 of its shore a distance less than the normal thickness of a conventional purlin so that its movement vertically over the sides of the latter is not terminated by abutting any concrete form sheathing extending across the top of the purlin.

The shore 31 is then manually pushed upwardly in sliding relation to the shore 30 until the end 36 contacts the under surface of the purlin 35. As the shore 31 is raised the outwardly curved end portions of the members 10 contact opposing sides of the purlin and resiliently spring outwardly until the ridges 22 on the curved portion 18 of each respective member are in contact with opposing sides of the purlin 35. The length of the substantially S-shaped portion of each respective member 10 is such that with the upper end 36 of the shore contacting the purlin 35 the ridges 22 are substantially midway of the vertical sides of the purlin. The resilience of the members 10 is preferably such that the ridges 22 slightly bite into the wood of the sides of the purlin. This is desirable in order to prevent lateral movement of the members 10 and to maintain the shores in vertical position when, through jacking operations for leveling the purlins, the same may be raised out of contact with the ends of the shores.

In Fig. 5 is illustrated how the S-shaped portions of the members may be altered to accommodate a purlin 40 which is of greater cross-sectional area than is the shore 31.

Fig. 6 illustrates the manner of altering the S-shaped portions of the members 10 to grip a purlin 42 which is narrower cross-sectionally than is the shore 31.

Gbviously the invention is susceptible to some change or alteration without defeating its practicability, and I therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein, further than I am limited by the scope of the appended claims.

I claim:

1. In combination with a vertical shore formed of wood of rectangular cross-section having a flat upper end for supporting a substantially horizontal purlin, of means for resiliently holding said shore and purlin together including pair of elongated resilient straps each having a trans versely flat inner face, and a portion of the order of half the strap length longitudinally fiat and attached to opposite sides of the shore below the said end, the remainder of each strap being first bent away from the plane of its shore side and thereafter forming a fiat 8 curve above the shore end, twice crossing the plane of said side and terminating outside of it a distance above the said end less than the distance between the upper and lower purlin surfaces, whereby the two straps form a divergent purlin entrance, each of said straps on the facing longitudinal convex areas below said entrance having longitudinally disposed integral ridge means to grip the purlin and prevent lateral movement of the shore in respect thereto.

2. A timber holder comprising in combination a shore post of rectangular timber having a flat end for supporting a horizontal purlin of rectangular timber, a pair of elongated transversely flat members of resilient metal each having a straight portion at one end, fastening means rigidly securing said portions flatly to opposite sides below the one end of said shore post, said members extending from said post beyond said end substantially one-half their length, said members being arcuately curved outwardly from the planes of said sides before reaching the end of said shore, said members being then reverse curved inwardly to cross the planes and then curved outwardly again crossing the planes to form arcuate diverging ends; and at least one integral longitudinally disposed sharp ridge formed on the inwardly facing curved portion within the said plane of each said member, whereby upon upward movement of said shore to contact the under surface of a purlin said diverging ends co-operatively resiliently contact opposing sides of said purlin to spread the said members for engagement of the purlin sides by the inwardly facing curved portions to frictionally grip the same by the ridges thereon thereby preventing lateral movement of said members along the sides of said purlin.

References Cited in the file of this patent UNITED STATES PATENTS 118,698 Denton Sept. 5, 1871 1,685,445 Bash Sept. 25, 1928 FOREIGN PATENTS 104,547 Switzerland Ian. 17, 1924