US2713710A

US2713710A - Mold for concrete step construction

Info

Publication number: US2713710A
Application number: US392346A
Authority: US
Inventors: Victor L Holland
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-11-16
Filing date: 1953-11-16
Publication date: 1955-07-26
Anticipated expiration: 1972-07-26

Description

July 26, 1955 v. HOLLAND MOLD FOR CONCRETE STEP CONSTRUCTION 3 Sheets-Sheet 1 Filed Nov. 16, 1953 Victor L .Ho/land IN V EN TOR.

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Victor L. Hal/and INVENTOR.

V. L. HOLLAND MOLD FOR CONCRETE STEP CONSTRUCTION m w m M m e a T 0 A m U m 4 H W q H S I a r m 3 2 m y 6 .w m V i Y 6 7 it!!! I. 4 t n W 3 m m V. m d m m July 26, 1955 United States Patent MOLD FOR CONCRETE STEP CONSTRUCTION Victor L. Holland, Denham Springs, La. Application November 16, 1953, Serial No. 392,346

Claims. (Cl. 25-118) This invention relates to the class of molding and casting apparatus and more particularly to a mold for use in forming pre-cast concrete steps.

The primary object of this invention resides in the provision of a mold especially adapted for use in conjunction with a mechanism for the vibration of the mold and which mold employs means for ensuring the convenient and speedy removal of the casting after such has set.

Some of the advantages of this invention are that a one-piece pan type seamless mold prevents leakage so as to eliminate blemishes and weakened steps while providing economy in the production line due to eliminating the necessity of assembling and disassembling the molds each time a casting is made, and while at the same time, producing integral tread and deck units with bottom and top extremities in parallel planes, thus simplifying the conveying, yarding, storage, transportation, packing and handling of the product as they may be stacked level.

In pre-cast concrete step construction, various inserts for molds have heretofore been used, but these have been found to be unsatisfactory since they become so closely associated with or bonded to the castingthat it is ahnost impossible to conveniently free the casting from the inserts or to form irregular surfaces in the casting and still be able to readily remove it from the mold. Therefore, this present invention includes the concept of providing means for urging a casting out from the casing in a positive manner while also utilizing means for detachably holding plugs for forming irregularly shaped mortar grooves in the casting, the plugs themselves being formed of a resilient material and being resiliently held by spring members in intimate engagement within holes in the casing of the mold. 1 I

Still further objects and features of this invention reside in the provision of a mold for casting concrete steps that is strong and durable, simple in construction and manufacture, capable of being arranged to form pre-cast concrete steps of advantageous construction, yet which mold is simple to employ and relatively inexpensive to construct.

These, together with the various ancillary objects and features of the invention which will become apparent as the following description proceeds, are attained by this mold for concrete step construction, a preferred embodiment thereof being illustrated in the accompanying drawing, by way of example only, wherein:

Figure l is a perspective view of a mesh-like basket adapted to be seated in the mold for reinforcing the casting;

Figure 2 is a perspective view of the mold comprising the present invention with the basket removed therefrom;

Figure 3 is a perspective view of the mold with the mold in an overturned position with respect to Figure 2;

Figure 4 is a top plan view of the mold;

Figure 5 is a vertical sectional view as taken along the plane of line 5--5 in Figure 4;

Figure 6 is a vertical sectional view as taken along the plane of line 6 -6 in Figure 4;

2,713,710 Patented July26, 1955 Figure 7 is an enlarged vertical sectional detail view illustrating in particular the manner in which the mold is supported so that it may be readily vibrated;

Figure 8 is a perspective view illustrating the manner in which the casting may be readily removed from the mold;

Figure 9 is a perspective view of the resilient inserts and supporting spring-like member interconnecting the insert; and

Figure 10 is a perspective view of a step constructed in accordance with the concepts of the present invention.

With continuing reference to the accompanying drawings wherein like reference numerals designate similar parts throughout the various views, reference numeral 10 generally designates the mold comprising the present in-.

vention which includes a casing 12 of rectangular shape having relatively deep depressions along three sides thereof as at 14, 16 and 18. These depressions are formed by tapering channel-

shaped portions

20, 22 and 24 integrally formed with the casing 12. A relatively shallow recess 26 formed by a relatively shallow channel portion 28 extends between and communicates with the

recesses

16 and 18.

Extending transverse to the

recesses

14 and 26 are a pair of

depressions

30 and 32 in the casing 10 which are of the same depth as the recess 26 and which open into the recess 28 and in turn to the recess 14.

Welded to the casing 12 in alignment with apertures as at 34 and 36 therethrough are threaded

collars

38 and 40. Extending through the apertures 34 and 36 and threadedly engaging the

collars

38 and 48 are

shafts

42 and 44 which are suitably threaded and which have attached to their ends handles 46 and 48 for permitting free rotation thereof. Rotatably mounted on the

shafts

42 and 44 in any suitable manner so as to prevent disengagement therewith while not permitting any relative movement except rotation are a pair of push-

plates

50 and 52, the

construction of which can be best seen in Figures 4 and 5. These push-plates are of elongated rectangular shape and are adapted to engage the lower surface of the casting formed in the mold 10 and urge the entire casting outwardly from the casing 12. p

In addition to the casing 12, the mold It) incorporates a basket 56 formed of wire mesh 58 and having a peripheral framework 60 contoured to conform to the convolutions of the casing 11 so that the peripheral framework is supported in the casing in the

recesses

12, 14, 16, 26 and inthe

depressions

30 and 32 with the mesh 58 being spaced from the walls of the casing 12. The basket 56 becomes integral with the casting which is generally indicated at 62 after the cementitious mix has been poured.

The casing 12 is provided with a peripheral angle iron reinforcing member 64 which extends about the peripheral upper edge of the casing 12 and is adapted to provide means for supporting the entire mold as by clips 66 and chains 68 or by such other means as may be desired so that a vibrating member 70 can engage the casing 12 to vibrate the casing so as to settle the cementitious mix forming the casting 62.

The dish-

shaped channels

22 and 24 are provided with

apertures

72 and 74 therethrough and the portions of the casing 12 defining the

depressions

30 and 32 are likewise perforated as at 76 and 78. These perforations are elongated in shape and are adapted to receive elongated resilient wedge-

shaped strips

80, 82, 84 and 86, respectively, which wedge-shaped strips are preferably formed of a resilient material such as rubber or the like. The

wedgeshaped strips

80 and 84 are secured to a spring-like metallic member 88 which continuously urges the

strips

80 and 84 inwardly of the holes or

slots

72 and 76. Likewise, a resilient spring-like member 90 continuously urges the

resilient plugs

86 and 82 into the

apertures

78 and 74, re

3 spectively. The

plugs

80, 82, 84 and 86 will form in the casting 62 suitable mortar recesses for keying the casting 62 with other elements of the pre-cast step construction.

The arrangement of the

resilient plugs

80, 82, 84 and 86 so as to form mortar locks and the fact that they are continuously urged inwardly of the holes in the casing 12 is highly important since the ready detachment of these resilient plugs can be obtained merely by further tensioning the

spring members

88 and 90 and withdrawing the entire assembly. With these resilient plugs removed, it is rather easy to remove the entire casting 62 since all that needs to be done is for the

handles

46 and 48 be rotated to cause the lifting or push-plates 50 and 54 to urge the casting upwardly out of the casing 12 as can best be seen in Figure 8. After the casting has set and has been removed from the casing 12, because of the vibratory member 70, a smooth surfaced and carefully configurated step will be formed from the casting 62 as can be best seen in Figure 10.

Since from the foregoing, the construction and advantages of this mold for casting concrete steps is readily apparent, further description is believed to be unnecessary.

However, since numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may readily be resorted to which fall within the scope of the appended claims.

What is claimed as new is as follows:

1. A mold for step construction comprising a rectangular casing, said casing having relatively deep recesses extending along three of the sides thereof, and a relatively shallow recess along the fourth side thereof, spaced wedge-shaped depressions parallel to each other and to two of said sides and normal to and intersecting one of said relatively deep recesses and said shallow recess, and means carried by said casing extending into said depressions for urging a casting out from said casing, a hole in said casing opening into one of said depressions opposed to a hole in one of said relatively deep recesses, resilient plugs seated in said holes, and a resilient spring member terminally secured to said plugs resiliently urging said plugs to seat in said holes.

2. A mold for step construction comprising a rectangular casing, said casing having relatively deep recesses extending along three of the sides thereof, and a relatively shallow recess along the fourth side thereof, spaced wedgeshaped depressions parallel to each other and to two of said sides and normal to and intersecting one of said relatively deep recesses and said shallow recess, and means carried by said casing extending into said depressions for urging a casting out from said casing, a hole in said casing opening into one of said depressions opposed to a hole in one of said relatively deep recesses, resilient plugs seated in said holes, and a resilient spring member terminally secured to said plugs resiliently urging said plugs to seat in said holes, said plugs being of an elongated wedge shape.

3. A mold for step construction comprising a rectangular casing, said casing having relatively deep recesses extending along three of the sides thereof, and a relatively shallow recess along the fourth side thereof, spaced wedge-shaped depressions parallel to each other and to two of said sides and normal to and intersecting one of said relatively deep recesses and said shallow recess, and means carried by said casing extending into said depressions for urging a casting out from said casing, a hole in said casing opening into one of said depressions opposed to a hole in one of said relatively deep recesses, resilient plugs seated in said holes, and a resilient spring member terminally secured to said plugs resiliently urging said plugs to seat in said holes, said casing having a peripheral angle member secured thereto for reinforcing said casing and supporting said casing for vibration thereof.

4. A mold for step construction comprising a rectangular casing, said casing having relatively deep recesses extending along three of the sides thereof, and a relatively shallow recess along the fourth side thereof, spaced wedgeshaped depressions parallel to each other and to two of said sides and normal to and intersecting one of said relatively deep recesses and said shallow recess, and means carried by said casing extending into said depressions for urging a casting out from said casing, said means comprising push-plates, threaded shafts rotatably secured to said push-plates, collars having threaded apertures secured to said casing, openings in said casing in alignment with said apertures, said shafts extending through openings and engaging said collars, and handles secured to said shafts for rotating said shafts, a hole in said casing opening into one of said depressions opposed to a hole in one of said relatively deep recesses, resilient plugs seated in said holes, and a resilient spring member terminally secured to said plugs resiliently urging said plugs to seat in said holes.

5. A mold comprising a rectangular casing, said casing having a recess therein, a depression in said casing spaced from said recess, a hole in said casing opening into said depression opposed to a hole in said recess, resilient plugs seated in said holes, and a resilient spring member terminally secured to said plugs resiliently urging said plugs to seat in said holes.

References Cited in the file of this patent UNITED STATES PATENTS 690,987 Nelson Jan. 14, 1902 2,148,084 Nock Feb. 21, 1939 2,148,189 Curran V- Feb. 21, 1939 2,173,253 Gallo v n Sept. 19, 1939 2,498,923 Jordan 7 Feb. 28, 1950 2,595,066 Ferrin Apr. 29, 1952