US2233270A

US2233270A - Extensible pipe section

Info

Publication number: US2233270A
Authority: US
Publication date: 1941-02-25
Anticipated expiration: 1958-02-25

Description

Feb. 25, 1941. a. F. RUHL EXTENSIBLE PIPE SECTION Filed April 11, 1940 ATTORNEY.

Patented Feb. 25, 1941 UNITED STATES PATEN FFIQE 3 Claims.

This invention relates to stove pipes and aimsto provide an extensible stove pipe by means of which a length of such pipe may be extended or retracted at will by a very simple manual operation. However, the invention may also be applied in any or every other field in which it Would be desirable to provide an extensible pipe or tube section (whether cylindrical or rectangular) after the manner of the invention, and the inventor does not Wish to limit the application of the invention to stove pipes.

As shown in the accompanying drawing and described in detail below, the simple pressing together of two of the projecting ears on one side of the pipe will cause elongation of the pipe, and similar pressing together of the opposite two ears will cause contraction of the pipe. The entire extensible pipe is made of only five pieces or sections, and it is apparent that these sections present but a simple problem to the manufacturer. The many uses to which such a pipe could be put are too obvious to require enumeration.

Referring briefly to the drawing,

Figure 1 is a front elevational view of the pipe section, in elongated condition.

Figure 2 is a similar view of the same in retracted condition.

Figure 3 is a cross-sectional view taken on the line 33 of Figure 4.

Figure 4 is a cross-sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a fragmentary elevational view, partly in section and with parts broken away, of the pipe section in retracted condition.

Referring in detail to the drawing, the numeral I9 indicates a unitary cylindrical tube having an outwardly extending equatorial bead II formed integral therewith. A pair of particylindrically shaped slides I2 and I3 each having a peripheral bead I4 and I5, respectively, lie substantially flush but slidably against the outer surface of the tube I0, with the bead II registering within the beads I4 and I 5. The bead II thus provides a track on which the beads I4 and I5 are adapted to slide. Each of the beads I4 and I5 has, as is apparent, two ends. At its two ends, the bead I4 has outwardly extending lugs or handles I6 and I1, respectively; at its two ends the bead I5 has two similar lugs or handles I8 and I9, respectively.

Near each vertical edge of each slide I2 and 3, ears 2!] are anchored by means of their bases 2| (which are at right angles to the ears) in. the slides, at the position shown, i. e., the slide I3 55 has such an ear 20 above the bead I5 and another equidistantly below the bead I5, in a vertical line, near the edge I8a of the slide adjacent the handle it. A similar pair of ears 20 are similally mounted near the opposite edge I911 of the slide l3, as shown in Figure 3. The slide I2 is similarly provided with a like number of similarly spaced ears 22, i. e., two ears 22 near the edge 55a and two near the edge Ila.

A sleeve 23 slidably surrounds the slides I2 and I3 above the beads I4-I5, and a similar 10 sleeve 24 similarly surrounds the slides below the beads I l-I5. The sleeve 23 is provided with four slots, of which the two at the front, shown at 25 and 26, incline divergently upward, and the two at the rear, 25a and 26a, incline divergently 15 downward. Likewise, the sleeve 2 4 is provided with two slots 21 and 28 which incline divergent- 1y downward, at the front, and with two similar slots 21a. and 28a, which incline divergently upward, at the rear. The

upper ears

20 and 22 20 register in the

slots

26 and 26a, and 25 and 25a, respectively, and the

lower ears

20 and 22 register in the slots 28 and 28a, and 21 and 21a, respectively. It is apparent that the ends of the

slots

25, 26, 21, 28, 25a, Zta, 21a, and 28a, serve as 25 limit stops to the axial movement of the

sleeves

23 and 24 toward or away from the beads I l-I5.

The operation of the device is as follows. Assuming that the pipe section is in retracted position, as shown in Figure 2, it is elongated by 30 grasping the handles I6 and I8 between the fingers of one hand and drawing them together. As these handles approach each other, they force the ears 20 toward the ears 22, both in the sleeves 23 and in that 24. Thus, the

slots

25, 26, 35 etc. act as cam surfaces, and as the ears ride in the slots they force the

sleeves

23 and 24 to be projected outward. When fully extended, the handles I6 and I8 lie close to each other, as shown in Figure 1, and the handles I1 and I9 40 are spread apart. To retract the pipe section to its original position, the handles I1 and I9 are grasped and drawn together into the position shown in Figure 4, whence the reverse action takes place and the

sleeves

23 and 24 are drawn 4 toward each other.

It is to be noted, in Figure 3, that the upper peripheries of the sleeve 23, slides l2 and I3, and tube It are slightly bent inward. This is done so as to provide a friction contact between the various parts to prevent them from slipping owing to their own weight when the section is any desired extended position.

Obviously, modifications in form and structure may be made without departing from the spirit and scope of the invention.

I claim:

1. A device of the class described comprising a tube having a peripheral bead extending outward therefrom intermediate its length, a pair of slides concentric with said tube slidably mounted against the outer surface thereof and having aligned beads formed therein, said tube bead registering in said slide beads and serving as a track on which said slide beads are adapted to ride, finger grips on the ends of said slide beads, a pair of sleeves, each of said sleeves being slidably mounted on one end of the device with its inner surface lying slidably against the outer surfaces of said slides, divergent slots in one of said sleeves, oppositely divergent slots in the other of said sleeves, and ears on said slides reg istering in said slots.

2. A device of the class described comprising a tube having a peripheral bead extending outward therefrom intermediate its length, a pair of slides concentric with said tube slidably mounted against the outer surface thereof and having aligned beads formed therein, said tube bead registering in said slide beads and serving as a track on which said slide beads are adapted to ride, finger grips on the ends of said slide beads,

a pair of sleeves, each of said sleeves being slidably mounted on one end of the device with its inner surface lying slidably against the outer surfaces of said slides, divergent slots in one of said sleeves, oppositely divergent slots in th other of said sleeves, and ears rigid on said slides registering in said slots, said ears comprising angle-shaped members each having a base anchored in said slides and a Wing portion projecting through the slot.

3. A device of the class described comprising a tube having a peripheral bead extending outward therefrom intermediate its length, a pair of slides concentric with said tube slidably mounted against the outer surface thereof and having aligned beads formed therein, said tube bead registering in said slide beads and serving as a track on which said slide beads are adapted to ride, finger grips on the ends of said-slide heads, a pair of sleeves, each of said sleeves being slidably mounted on one end of the device with its inner surface lying slidably against the outer surfaces of said slides, divergent slots in one of said sleeves, oppositely divergent slots in the other of said sleeves, and members on said slides registering in said slots.

GEORGE, F. RUHL.