US2614412A

US2614412A - Mechanical pointing device

Info

Publication number: US2614412A
Application number: US176303A
Authority: US
Inventors: William H Dance
Original assignee: JAMES O DANCE
Current assignee: JAMES O DANCE
Priority date: 1950-07-28
Filing date: 1950-07-28
Publication date: 1952-10-21
Anticipated expiration: 1969-10-21

Description

Oct. 21, 1952 w. H. DANCE 2,614,412

MECHANICAL POINTING DEVICE Filed July 28, 1950 W FIG. 3

' INVENTOR WILL/AM H. DANCE g a r W A TTVS Patented Oct. 21, 1952 UNITED STATES PATENT OFFICE MECHANICAL POINTING DEVICE William H. Dance, Cambridge, Mass., assignor to James 0. Dance, Cambridge, Mass.

Application July 28, 1950, Serial No. 176,303

. 3 Claims.

This invention relates to a mechanism for inserting mortar in seams between bricks, concrete blocks, or the like after such bricks or blocks have been laid in courses without mortar. It can also be used to point up the mortar in a brick wall or the like from which portions of the mortar have been dislodged. It is an object of the invention to provide a mechanism by which mortar can be rapidly and neatly applied to horizontal or vertical seams. The invention consists essentially of a hopper which has a narrow elongated spout at the lower end thereof and which is pivotally attached to a portable frame. This frame also carries mechanism by which the spout is rapidly vibrated with oscillations of small magnitude so as to push the mortar which flows through the spout into the crack or seam opposite which the spout is held by the operator. Any convenient mechanism for vibrating the spout may be employed. According to the present invention, the frame carries a small electric motor which is adapted to revolve at high speed and to rotate a cam having eccentric edge portions. A cam follower is pressed against the cam by a suitable spring and the follower is operatively connected to the hopper so as to rock the hopper rapidly through oscillations of small amplitude.

For a more complete understanding of the invention, reference may be had to the following description of an embodiment thereof and to the drawing, of which- Figure 1 is a side elevation of apparatus embodying the invention;

Figure 2 is a front elevation of the same;

Figure 3 is a sectional view on the line 3-3 of Figure 2, on a larger scale; and

, Figure 4 is a section on the line 4--'4 of Figure 3.

A mechanical pointing device is illustrated on the drawing, comprising a hopper tapers downward to a narrow elongated spout I2 at the lower end thereof. The spout is preferably curved forward and has an orifice which opens toward the front for the ejection of mortar forward therefrom in an approximately horizontal direction. A forwardly projecting lip I4 is provided immediately below the orifice of the spout to guide the mortar as it is ejected from the spout as hereinafter described. The hopper I is pivotally attached as at I6 near its upper end to a portable frame 20 so as to be rockable about the axis of the pivot I6. Near the lower end of the hopper are a pair of ears 22 which project from the rear wall and are pivotally attached to a link 24. This link extends rearward I 0 whichl 2 1y from the spout and carries near its further end a cam follower 2B which is pressed against the surface of a cam 30 by a suitable spring 32 which is compressed between a portion of the ink 24 and a part 34 of the frame 20.

The cam 30 may be of any desired shape hav ing high and low portions so as to cause reciproeating movements of the cam follower 26 when the cam is rotated. As shown in Figure 3, the cam may have two eccentric arcuate surface portions with high points 36. Rotation of the cam causes thecam follower 26 to move toward the right until it rides off the next high point 36 whereupon the spring 32 pushes it quickly to the adjacent low portion-of the cam. Since the cam follower 26 is connected by the link 24 to the lower portion of the hopper In, these movements of the cam follower result in similar reciprocating movements of the spout I2 but with slightly greater amplitude owing to the vertical distance between the ears 22 and the orifice of the spout I2. Owing to the arrangement of the cam, cam follower and spring, as shown in Figure 3, rearward movements of the spout away from a wall to which mortar is being applied are positive, but

forward movements of the spout toward the wall are yielding, such movements being produced by spring pressure. This minimizes the possibility of injury to the spout from actual contact with a wall when the device is operating.

The cam is mounted on a shaft 40 which is connected to and driven by an electric motor 42, the motor being conveniently mounted on the frame 20. The motor is designed to run at a fairly high speed, that is, between one thousand and two thousand R. P. M. Since the cam 30 illustrated in Figure 3 has two high points, the spout I2 will be oscillated twice as fast as the rotor of the motor 42 revolves. The effect of the oscillation of the spout I2 is to eject a stream of mortar from the spout, this mortar being pushed well into the cracks between courses of bricks or concrete blocks when the apparatus is held so that the spout is directly opposite such seam or crack. As the spout vibrates toward and from the seam, each forward movement of the spout impels forward the small amount of mortar which is on a level with the orifice. The cam immedi ately jerks the spout back to quickly to overcome the forward momentum of the mortar at the orifice. A small amount of mortar is in this manner caused to protrude from the orifice. Since theses reciprocating movements are rapid, the cumulative effect thereof is the issuance of a steady stream of mortar from the orifice, the

rapid impulses appearing to act through the stream itself to produce a tamping action which completely fills the seam or crack between courses of bricks or blocks if a proper rate of advance along the seam is maintained. Cavitation within the hopper and spout is also prevented by the vibratory movements.

I claim:

1. A portable pointing device comprising a frame, a hopper pivotally attached near its upper end to said frame, said hopper tapering to a spout at its lower end with a forwardly opening orifice at said lower end, a lip projecting forward from immediately below said orifice, and means connected to said spout for rapidly rocking said hopper in a front and rear direction, whereby said spout and lip will direct mortarapproximately horizontally from said orifice and tamp the same in a mortar groove, said rocking means including a motor-driven shaft mounted on said frame, a cam having relatively high antllow portions mounted'on said. shaft'to rotate therewith, a link connected atone end to said spout and extending rearwardly therefrom, a cam follower carried by the other end of saidlink, and spring means re WILLIAM H. DANCE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,142,022 Chappell June 8, 1915 1,652,434 George et a1 Dec. 13, 1927 1,973,885 Rasmussen Sept. 18, 1934 FOREIGN PATENTS Number Country Date 123,498 Austria Feb. 15, 1931