US2015986A

US2015986A - Ninety degree dial indicator

Info

Publication number: US2015986A
Application number: US732978A
Authority: US
Inventors: Erik H Aldeborgh; Alfred H Emery
Original assignee: Standard Gage Co Inc
Current assignee: Standard Gage Co Inc
Priority date: 1934-06-29
Filing date: 1934-06-29
Publication date: 1935-10-01
Anticipated expiration: 1952-10-01

Description

NINETY DEGREE DIAL INDICATOR Filed June 29, 1934 lllllflllllllif f 3nnentor5 Erik H/Meborqh.

Patented Oct. 1, 1935 UNHT ED STATES PATENT OFFlfiE NINETY DEGREE DIAL INDICATOR of New York Application June 29, 1934, Serial No. 732,978

3 Claims.

This invention relates to a dial indicator of that class which is known as a 90 degree indicator in which the contact plunger is mounted at right angles to the indicator operating plunger, and

which is sometimes called an angle indicator, and the present invention is an improvement over that shown, described and claimed in United States Patent No. 1,891,196 issued on December, 1932 to Erik H. Aldeborgh and Christian E. Ruf.

In the above referred to patent the movement of the contact plunger is transmitted to the indicator operating plunger through a pivoted bellcrank, which construction required the contact plunger be mounted off-set with respect to the instrument, which had many disadvantages, as

well as being costly to manufacture.

The object of the present invention is to construct a 90 degree dial indicator with the contact plunger concentric both with the dial and and the back plate.

Another object of the invention is to construct an instrument of this kind having few movable parts and those of rugged design, positive in operation and of long wearing qualities.

Another object of the invention is to provide an instrument of this kind that shall be readily assembled, be accurate and easily adjusted or its parts renewed.

With these and other objects in view, our invention consists in certain novel construction and combination of parts as will hereinafter be fully described and claimed, and further illustrated in the accompanying drawing which forms a part hereof and in which like figures of reference refer to corresponding parts in all of the views, and it is understood that slight changes may be made without departing from the spirit of the invention.

In the drawing:

40 Figure 1 shows a side elevation of the dial indicator gage.

Figure 2 shows a rear view of the same.

Figure 3 shows an inside View of the back plate removed from the casing.

45 Figure 4 shows a partial vertical sectional view of the gage.

Figure 5 shows a partial sectional view of the rear of the casing, indicating plunger and anvil block.

50 Figure 6 is a vertical sectional view of the back plate, and a partial view of the indicating plunger and its rack and gear.

Referring to the drawing:

A dial indicator similar to that shown in Patent 55 No, 1,891,196 is indicated by the numeral l0, and

this is provided with a ring-shaped casing II which is formed with the two aligned bearings l2 and E3, the ends of which are closed by the threaded plugs l4, and within which is slidably mounted the indicating operating plunger 15 5 which is provided with the rack teeth it in mesh with and designed to rotate the pinion ll which is mounted within the gear casing I8 and which through the usual train of gearing will rotate the indicating hand over the dial of the indicator. 10

Secured to the ring casing II and to the gear casing 18 in a detachable and interchangeable manner by the screws I9 is the back plate 20, which is formed with the boss 31 which supports the concentric stem 2| which is designed to be 15 mounted in a tool holder, fixture or other means for supporting the instrument when in use.

This stem 2! is formed with an axial bore 22, having its upper end slightly countersunk as at 23 and communicating with a recess 24 which is 20 formed in the boss 31 of the plate 2i as shown in Figure 3.

Within this bore 22 is slidably mounted the contact plunger 25 which is provided with the head 26 which is mounted within the counter- 25 sunk portion 23 and the recess 24, while the lower end of the plunger 25 projects beyond the lower end of the stem 2| and has thereon a collar 21 which limits the inward movement of the plunger 25, and below said collar 21 is the contact point 30 28, which may be of some material hardened and ground or be formed with a diamond point.

The indicating plunger l5 has secured thereon and partly within the recess 24 an anvil block 30 by the screw 3|, and this anvil block 39 is formed with a beveled face 32, having approximately a 45 degree angle as shown, and this face 32 is formed with a central groove 33, extending from top to bottom thereof.

For imparting movement to the indicating 40 plunger l5 against the action of the tension spring 34, which has one end attached to the rod 35 and the other end attached to the casing l I, to operate the hand through the movement of the contact plunger 25, there is placed within the recess 24 a hardened steel ball 35; said ball 36 being both in contact with the head 26 of the contact plunger 25, the end of the recess 24 and the beveled face 32 of the anvil block 30; the ball 36 being in contact with the edges of the groove 33 which tends to keep the ball 36 central with the indicating plunger 15 and the contact plunger 25, thus eliminating any friction that would be caused should the ball come into contact with the sides of the recess 24.

Thus through the ball 36, movement from the contact plunger 25 will be transmitted to the indicating plunger !5 without any lost motion between the parts; the spring 34 normally retaining the ball 36 in contact with the head 26, and the contact plunger 25 in its extended position.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a dial indicator of the class described, comprising in combination with a casing having an indicator operating plunger mechanism therein, a back plate for said casing and a contact plunger for operating said indicating mechanism mounted within said back plate and extending therefrom, of means for imparting movement from the contact plunger to the indicator operating plunger comprising an anvil attached to the indicating-operating plunger and a loose ball mounted in said back plate between and in contact with said anvil and the plunger.

2. In a dial indicator of the class described, comprising in combination with a casing having an indicator operating plunger slidably mounted therein, a back plate for said casing and attached thereto, of a concentric stem formed on said back plate, a contact plunger slidably mounted therein and having a head within said back plate, said back plate formed with a radial recess in Within said recess in contact both with the head of the plunger, the face of the anvil and the end of the recess;

3. In a right angle dial indicator of the class described, the combination with a casing having an indicator operating plunger slidably mounted therein, and a back plate for said casing detachably secured thereto, of a boss formed on said back plate, a stem formed on and extending from said boss in concentric relation with the' back plate and formed with an axial bearing therein, said boss formed with a radial recess communicating with said axial bore, a contact plunger slidably mounted Within said bearing with its lower end extending from said stem, a

head on the upper end of said contact plunger and located within the recess, an anvil'formed with a grooved and beveled face and secured on said indicator operating plunger, and a ball mounted within said recess both in contact with the end of said recess and with the beveled face of the anvil and the head of the contact plunger.

ERIK H. ALDEBORGH. ALFRED H. EMERY.