EXPANSIBLE REVEAL WITH FRONTAL TEAR STRIP FOR PLASTER WALLS

• US 3,667,174 A
• Filed: 02/13/1970
• Issued: 06/06/1972
• Est. Priority Date: 02/13/1970
• Status: Expired due to Term

• Current Assignee: Robert W. Arnett
• Original Assignee: Robert W. Arnett
• Inventors: Arnett, Robert W.
• Primary Examiner(s): Abbott, Frank L.
• Assistant Examiner(s): Braun, Leslie A.
• Application Number:
  US05/011,206
• Time in Patent Office: 844 Days
• Field of Search: 52/58,60,61,100,212,364,371,377,399,255-257,709,710
• US Class Current: 52/100
• CPC Class Codes: E04B 1/6807 Expansion elements for parts cast in situ
• CPC Class Codes: E04F 13/06 Edge-protecting borders borders for joints between plaster layers and window or door frames or like E06B1/62
• CPC Class Codes: E04F 2013/066 for expansion joints between two plaster layers
• CPC Class Codes: E04F 21/04 Patterns or templates; Jointing rulers profile trowels E04F21/16

Abstract

An extruded generally T-shaped separator or screed is tacked along the wall base with the center leg projecting outwardly. Plaster is applied to the wall base to interlock opposite sides of the screed leg. The screed leg is itself hollow, the frontal exposed side being a tear strip finally removed to form a reveal, and the rearward side being bowed or sinuous to form an expansion mechanism. As the plaster expands and contracts transversely to the screed leg, the reveal opens and closes correspondingly without any separation of the leg sides from the respective sections of the cast wall.

Claims

1. In a wall structure including a support and a pair of separate slabs of plaster-like material cast in situ on said support, the combination therewith of a unitary elongated expansible hollow separator between said slabs:

a. said separator having a front wall, a rear wall and opposite side walls;

b. said rear wall including a pair of planar flanges for attaching said separator to said support with said front wall facing outwardly, said flanges respectively extending laterally in opposite directions, said side walls serving as screeds to establish the thickness of said slabs;

c. the center portion of said rear wall being inwardly arched to allow movement of said side walls toward and away from each other in response to expansion and contraction of said separate slabs;

d. said front wall being joined to the side walls by fracture webs of thinner cross-section than said front wall whereby said front wall forms a tear strip removable after said slabs are formed, said fracture webs being defined by inwardly beveled outer ends of said side walls, said front wall being substantially flush with said side wall outer edges so that upon removal of said front wall said separator is exposed only at the region of its hollow interior; and

e. each said side wall being provided with an anchor means disposed intermediate said front and rear walls and extending laterally outwardly from that side wall, the outer end of each anchor being a T-head locking the side wall to its associated slab for conjoint movement therewith.