US1344115A

US1344115A - Form for concrete construction

Info

Publication number: US1344115A
Application number: US335076A
Authority: US
Inventors: John H Cresmer
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-11-01
Filing date: 1919-11-01
Publication date: 1920-06-22
Anticipated expiration: 1937-06-22

Description

2 SHEETS-SHEET l.

Patented J une 22, 1920.

J. H. CRESMER.

FORM FOR CONCRETE CONSTRUCTION.

APPLICATION FILED NOV. 1, 1919. 1,344,115.

4 1770621157: J5/z17 E Ores 7e)"; A 1' urac J. H. C-RESMERl FORM FOR CONCRETE CONSTRUCTION.

APPLICATION FILED NOV-1,19lfi,

PatentedJune 22, 1920.

2 SHEETS-SHEET 2.

\ H NIH l HIHI 1512 W A L 6577 67 Q4 w v 7 W- UNITED STATES JOHN H. CRESMER, or RIVERSIDE, CALIFORNIA.

roan roa condemn CONSTRUCTION.

Specification of Letters Patent.

Application filed lt ovember 1. 1919. Serial No. 335.076.

To all whom it may concern:

Be it known that'I JOHN H. CREsMnR, a

citizen of the United t-ate's,residing at Riv ers'ide, in the county of Riverside and State of California, have invented a new and use ful Form for Concrete Construction, of which the following is a specification.

. This invention relates to forms for concrete construction and more particularly to collapsible forms which are adapted for use in building hollow or chambered. walls.

The object of the invention is to provide a collapsible form or core that can be expanded or contracted uniforinl throughout its length so that it can be readi y freed from the walls of the hole when it is desired to remove the core from the wall.

Another object is to provide a collapsible I form constructed of rigid sections andto provide mechanism for expanding the form and which cannot be displaced by transverse crushing strains. U

Various other objects and advantages will be apparent from the following detailed description of theacompanying drawings which form a part of this disclosure and which'illustrate a preferred form of embodiment of the invention.

Ofthe drawings:

Figure 1 is aside elevation of my improved form with one of the side plates re moved to disclose the interior mechanism,

the parts being illustrated in expanded position. '7 V Fig. 2 is a similar view with one of the es and its companion wedge shoe side plat removed,- the parts being illustrated in collapsible position.

Fig. 3 is a section on line ar -a: of Fig. 1. Fig. 4 is a section on line w-'w* of Fig. 2. Fig. 5 is a side elevation ofone ofthe side plates and its companion wedge shoe.

Fig. 6 is aplan view. Fig. 7 is a section on line cl-w" of Fig.- 1. Fig. 8 is a section on line av -m of Fig. 2. Fig. 9 is a perspective View of the wedge element comprising the wedge slide "and wedge blocks.

The form herein illustrated and described is intended for use as a core for the formae tion ofvertical chambers in a concrete wall and in use it is positioned within the wall space intermediate the opposed exterior wall forms. The core, when so positioned, is in an expanded condition and when the wall is in partly set condition so as to retain its molded contour, the core will be collapsed for removal or for shifting to a higher elevation for a continued molding operation.

As illustrated, the form consists of two opposed parallel side plates 1-2 andtwo op- Patented June 22,1920.

posed parallel edge strips 3-4 each posi- I tioned intermediate the adjacent vertical edges of the plates 1-2 as shown in Figs. 6, 7, and 8, each edge strip havinga flat inner surface and a semicircular outer surface I having a facing 5 of sheet metal. The side plates 1-2 have angularly inturned vertical edges which overlap the edge strips 3-4 and engage the semi-circular surfaces thereof. The top and bottom edges of the side plates are flanged inwardly and are reinforced by blocks 6-6 and 7-7.

Each side plate is further reinforced by wedge shoes 8-9 and by a connecting guide bar 10, all of which are secured to the respective side plate to form an integral unit. The shoes and guide bar of each side plate are relatively alined with those of the opposed side plate, the shoes providin-g opposed angled wedge surfaces 11-11 and 12-12 and the guide bars having opposed vertical grooves 13-13 out in their inner surfaces.

The ends of each of the wedge shoes are provided with transverse orifices 1 1 -14, the orifices of each wedge shoe beingaxially alined tive wedge shoes by rectangular plates 16,

threaded through the last coils of the springs and engaging shoulders formed by enlarged portions of the orifices. (See Figs.- 1 and 7). These springs tend to draw the two side plates together in collapsing position.

Centrally positioned between the side plates 1-2 I provide a vertical slide 20 having vertical keys 21-21 projecting laterally from opposite sides of the slide and engaging into the grooves 13-13 of the guide bars 10 of the side plates. Secured near the ends of the 'slide 20 are wedge blocks 22-23, the block 22 being'positioned to engage between the wedge surfaces 11-11 of the wedge shoes 8-8 andth'e block 23 being positioned to engage between the wedge surfaces 12-12 of the wedge shoes 9-9 (see Figs. 34).

From -the above it will be evident that when the slide 20 is elevated, the wedge blocks 2223 engaging against the wedge surfaces of the wedge shoes, will cause the side plates to be separated to expand the form.

Attached to the inner surfaces of the edge strips 3- 1 and at opposite ends thereof 1' provide brackets 2526 and pivotally connected to said brackets and to the opposite ends of the slide 20 are pairs of toggle links 2T2S. (Sec Figs. l-Q). With the form in collapsed condition as shown in Fig. 2, it

"will be understood that an upward movement oi the slide 20 will tend to straighten the toggle links to the dead-center position shown in Fig. l and by such movement will separate the edge strips in a form expanding operation.

The means for translating the slide 9A comprises a hand lever 30 having a pivot pin 31 journaled in the reinforcing blocks G-G of the side plates and which is connected to the slide by a connecting link 32. Vith the form in collapsed condition as shown in Fig. 2, a turning oi the hand lever 30 in a counter-clockwise direction will elevate the slide to expand the term, the parts then assuming the positions shown in Fig. '1, after which a flanged cover 33, having a slot for the passage of the hand lever, is placed over the top of theform, a rod 34: being threaded through an orifice in the hand lever above the cover and extended beyond the sides of the form to provide a means by whichthe form can be suspended from any suitable support.

It will be evident that as the toggle links 27-28 are straightened to dead-center position in a form expanding operation, the edge strips 3et will. be maintained in expanded position against all transverse crushing strains so long as the slide 20 is maintained in elevated position.

It 7 will be noted that the cooperating wedge surfaces of the wedge blocks 22-23 and wedge shoes 8-9 of each side plate are correspondingly angled to a'degree not exceeding the angle of repose, the angle of repose beingS degrees plus a co-eificient of friction. Therefore, regardless of the-transverse crushing strains which may be applied to the side plates, the wedge surfaces will exert no camming influence upon the slide 20 such as would tend to force it downwardly to collapsing position.

From the above it will be understood that the operating mechanism cannot be displaced by transverse crushing strains applied to the form and that the means formed by the cover for maintaining the hand lever in operated position, is only to prevent an accidental displacement thereof.

In using the form in the construction of a wall the concrete is brought to a level flush with the upper surface of the cover; the downwardly projecting flange of the cover wedge shoes forming a groove in the top surface of the wall section being molded, and when the form is elevated for the melding of the next higher wall section, the concrete will enter the groove in the first section to form a tongue and groove joint between the sections.

I claim:

1. Adevice of the class described having opposed side'plates provided with angled wedge shoes, edge strips intermediate the side plates, a vertically movable slide intermediate the side plates and edge strips and provided with wedge blocks adapted to cooperate with the adjacent wedge shoes, toggle-links pivotally. connected to the edge strips and to the slide, means for translating the slide, and means yieldingly urging the side plates toward each other.

2. A device of the class described having opposed side plates provided with angled and vertical guide grooves, edge strips intermediate the side plates, a vertically movable slide having keys engaging into. the guide grooves, wedge blocks carried by the slide in position for cooperation with the wedge shoes, toggle links pivotally connected to the edge strips and to the slide, n'icans for translating the slide, and means yicldingly urging the side plates toward each other. l

3. A device of the class described having opposed side plates each formed with inturned i edges and provided with spaced wedge shoes, edge strips intermediate the inturned edges of the side plates, aslide having spaced wedge blocks positioned for cooperation with the companion wedge shoes of the side plates, toggle-links pivotally connected to the edge strips and to the slide, means for translating theslide, and means yieldingly urgingthe side plates toward each other.

4,. A device of the class described having opposed parallel side plates formed with angled wedge shoes, the shoes of one plate being oppositely disposed relative to those of the other plate, parallel edge strips intermediate the side plates and oppositely positioned adjacent the edges thereof, a slide intermediate the side plates and having wedge blocks adapted to engage between the wedge shoes to separate the side plates, toggle'links pivotally connected to the edge strips and to the slide, means for translating the slide,and means yieldingly urging the side plates toward each other.

A device of the class described having opposed side plates provided with angled wedge shoes, edge strips intermediate the side plates, a vertically movable slide intermediate the side plates and edge strips and provided with wedge blocks adapted to cooperate with the adjacent wedge shoes, toggle-links pivotally connected to the. edge strips and to the slide, means for translating the slide, means yieldingly urging the side plates toward each other, and a cover element maintaining the slide translating means in operated position.

6. A device of the class described having opposed side plates provided with angled wedge shoes and vertical guide grooves, edge strips intermediate the side plates, avertically movable slide having keys engaging into the guide grooves, wedge blocks carried by the slide in position for cooperation with the wedge shoes, toggle links pivotally connected to the edge strips and to the slide, means for translating the slide, means yieldingly urging the side plates toward each 'other, and a cover element maintaining the slide translating means in operated position.

7. A device of the class described having opposed side plates each formed with inturned edges and provided with spaced wedge shoes, edge striips intermediate the inturned edges of the side plates, a slide having spaced wedge blocks positioned for cooperation wlth the companion wedge shoes of the side plates, toggle-links pivotally connected to the edge strips and to the slide, means for translating the slide, means yieldingly urging the side plates toward each other, and a cover element maintaining the slide translating means in operated position.

8. ,A device of the class described having opposed parallel side plates formed with angled wedge shoes, the shoes of one plate being oppositely disposedrelative to those Signed at Riverside, California, this 16th day of October, 1919.

JOHN H. CRESMER.

Witnesses:

CLARENCE B. FOSTER, L. BELLE WEAVER.