US1431613A - Telescoping inside gauge and indicator - Google Patents

Description

l W. vI/ITIIIER. TELESCOPING INSIDE GAUGE ANDV INDICATOR. l APPLICATION FILED DECIZZ, |921.

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TELJESCOPING INSIDE GAUGE AN 1D KNJDICATUM..

application led December 22, 1921. aerial Ito. Mamba.

following is a specification.

ject the desired distance This invention relates to a telescoping gauge, having a test indicator attachment, adapted for taking insidemeasurements.

The object of my invention is to provide an instrument for convenientl taking exact inside measurements of cylinders, holes,

slots, key ways and-other openings, or between walls of structures, and for showing inequalities in opposed surfaces.

A special object is to immediately show variations in dimensions at the exterior of a deep or long opening into which the measuring part of the instrument is inserted.

The matter constituting my invention will be defined in the claims.

ll will now describe the-details of construction of my improved gauge by reference to the accompanying drawings, in which:

Figure 1 represents kan elevation of the instrument, with parts in section, in position in a cylinder to begaged.

Fig. 2 represents a sectional elevation of an extension plunger.

Fig. 3 represents a top plan View of a detail.

The telescoping inside gauge 1 is constructed with a tubular casev or socket 1, havin a lower curved head or knob 1b and a colglar or enlarged portion 1c at the top provided with an internally screw threaded socket 1d, which is also externally. screw threaded at k for receiving the handle 5. rllhe telescopin extension plunger 2 is made holllow and o -a diameter-to slide freely in the holder socket 1, and of a length to probeyond the upper end of part 1a, as shown in Fig 1. `The plunger 2 has a longitudinal groove or slot 2a to'form a guide way for a screw le; and a rounded contact knob 2U. Within the hollow of the plunger 2 is placed a helical spring adapted to extend beyond the open end when not compressed, as shown in .F ig. 2. The plunger and spring are seated 1n the case la. Upon the plunger is secured a collar 3, having an adjusting thumb screw 3 and a beveled contact lug 3h, havin a beveled under tace a. The elongated ho low handle 5v has a screw threaded inner end It adapted to ento engage the socket 1d" and at its lower end a knurled head 5a. This knurled head has a longitudinal threaded opening g and is hollowed at its inner end toY tit loosely and turn upon a reduced portion of the handle 5. Within the handle 5 is mounted a rod f engaging at its outer end with the threaded opening g, and having a screw threadedinner end f which passes through the threaded opening of socket 1d, so as to bear at its inner end upon the plunger 2, as shown in Fig.. 1, and hold said plunger in a fixed position, or serve for.

releasing the same after the instrument has been inserted in a hole or bore of a cylinder. Mounted upon the handle 5 are two guide way collars 6, secured b upward extensions provided with openings e. The push rod 7 is provided at its inner end with a contact knob b and at its outer end with a knob al, and near the middle with a colla-r cas a bearing for a coiled sprin 8, Which bears at its opposite end on the co lar 6. The spring acts to lightly 'push the rod against the beveled face ot' lug 3b. The knob d of rod 7 is in position to make contact with a contact pin 11 in an indicator.

lin connection with this gauge I preferably use my test indicator 10, which may be mounted in any convenient position on the handle 5, and preferably by means .of a post 111 secured by a collar 14a on the handle. llo the post is secured'a holder bar 15 on the indicator. and knob 11 working in a tubular stem and connecting with the interior lever mechanism for operating the pointer 13, which is adapted to traverse the graduated scale on the arc 12. The test indicator 10 is the subject of a separate application for patent, and is adapted tov show variations in dimensions of a thousandth of an inch or less.

The operation or manipulation of the device will be readily understood by those skilled in metal working arts. It may be Yused for taking the exact size ot' shrink, close or loose fits varying in thousandths of an inch or less; these variations can be made and'measured. 4To measure a hole or interior of a c linder the instrument may be used as fol ows: Compress the telescoping plunger and lock it by a slight turn of the head 5, insert the case and plunger inside the hole or cylinder,

as illustrated in Fig. 1, then set the indicator pointer at zero, release screws and having the lbck or rod f and then slide in from front to back of the opening, then swing the han- -dle up and down and the indicator will show any variations in dimensions and Whether the hole or bore is straight, also the size of the hole or bore. The spring 4 will press the extension lunger against the surface of the hole an permit depression, carrying With it the collar and beveled contact lu 3b, Which,bearing on the push rod 7, Wil transmit movement to the contact pin l1 and thus to the pointer arm 13, which Will show the variations on the scale in 'thousandths of an inch.

The gauge may-be made from one and a hair inches to six inches or more and With a handle up to nine inches long; it can be used either for short or long holes or key Wa s.

lillariations in details of construction mayl of said rod for showing variations in dimensions of inside surfaces.

2. The combination with a casing socket, an extension plunger. and spring therein, of a collar having a beveled lug on said plunger, an elongated handle engaging with said c:1sing socket, a push rod mounted on the handle and adapted to make contact with said beveled lug, and a test indicator positioned to make contact with the outer end of said rod 'for taking inside measurements.

3. The combination with a casing socket and an extension plun er and spring therein, of an elongated han( e engaging with theJ socket member, collars fixed on the handle, and provided with openings, a springpressed push rod in the opening of said collars and having contact ends, :i beveled lug on said plunger and adapted to bear on the inner end of said rod, and a test indicator mounted on the outer end of said handle and having a contact pin in )osition to make contact with the outer en of said rod for taking inside measurements in a hole or si key Way.

n testimony whereof l aiix my signature in presence of two Witnesses.

WILLAM Wl' "lNER Witnesses:

i CHAS. W. BRUGER,

RICHARD GABmELsKY.

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