US2832142A

US2832142A - Scriber for the production of templates

Info

Publication number: US2832142A
Authority: US
Inventors: Charles H Hoagland
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-05-10
Filing date: 1956-05-10
Publication date: 1958-04-29
Anticipated expiration: 1975-04-29

Description

April 29, 1958 c.' H. HOAGLAND 2,832,142

SCRIBER' FOR THE PRODUCTION OF TEMPLATES Filed May 10, 1956 I i; A 1 i L'li I k 2 39 58 4 /9 2o 33 INVENTOR CHARLES H. HOAGLAND ATTORNEYS SCRIBER FQR THE PRQDUCTION IF TEMILATES Charles H. Hoagiand, Springfield, Ohio Application May In, 1956, Serial No. 583,971

3 Claims. (Cl. 33--4l This invention relates to scribing devices and is particularly directed to a scribing device having utility in the production of templates.

In industry, and particularly in the airplane industry, it is often desirable to produce from a given or reference template another template which is of the same contour as the reference template but which varies in peripheral dimension from the reference template. The primary object of this invention is to provide a scribing device for the production of templates which are of the same contour but either slightly smaller or slightly larger in peripheral dimension than a reference template.

An important object of the invention is to provide a scribing device which may be conveniently held in the hand of the user of the device and which device is firmly guidable in contact with the periphery of a reference or given template, the scribing device having a seat formed thereon for reception of a rim portion of a reference template and against an edge of which reference template a guide of the device is positionable.

A principal object of the invention is to provide a scribing device which includes means for accurately positioning a scribing point with respect to a reference template with which a guide of the device is in contact.

Another object of the invention is to provide a scribing device which may be conveniently retained in the hand of a user of the device and which device incorporates micrometer measuring means for adjusting the scribing point of the device in precise relation to a reference template.

Yet another object of the invention is to provide a scribing device which is of simple and improved construction, which is composed of few but simple, readily assembled parts, all so constructed and arranged as to preclude the liability of breakage or derangement of the same; which device is positive and accurate; is of small size and weight; and which has proved thoroughly efficient in the attainment of the ends for which it is designed.

These and other allied objects and advantages of the invention will become apparent from the following detailed description and accompanying drawings wherein:

Figure 1 is a View in side elevation of one embodiment of the scribing device of invention, the device being illustrated in association with a reference template and the scribing point of the device being shown in both solid and dotted lines, the solid line configuration representing an initial position of the point and the dotted line posi: tion indicating the position of the point for scribing a template of lower peripheral dimension than the reference template;

Figure 2 is a view in side elevation of the scribing device of Figure 1 but with scribing point shown in dotted line being arranged for scribing out a template of smaller peripheral dimension than a reference template;

Figure 3 is an exploded view of theqscribing device of Figures 1 and 2; and

CJY

Figure 4 is a plan view of the structure of Figure 1 further illustrating the arrangement of the scribing device in scribing out a template of larger peripheral dimension than a reference template.

Referring to the drawings more in detail, the numeral 1 indicates a frame of the scribing device, the frame being longitudinally extending and having a lower planar surface 2. The frame 1 is provided at one end thereof with a guide or guide nose 3; this guide is adjustably mounted on a portion 4 of the frame 1 by means of a cooperating screw 5 which is engageable against the nose and which extends into a threaded aperture of the portion 4 through a longitudinal opening 6 (Figure 4-) in the guide 3. This arrangement provides for longitudinal adjustment of the guide 3 with respect to the remainder of the frame.

At the opposite end the frame 1 is provided with a second guide 7 which like guide 3 extends perpendicularly to the planar surface 2 at an end of the surface. These vertically extending guides 35, 7 are adapted to engage against a peripheral edge of templates of a given contour, such as are illustrated at ii in Figures 1 and 4 and at 9 in Figure 2.

The longitudinally extending frame 1 is provided with a longitudinally extending slot lltl which communicates an upper surface portion of the frame, indicated at 11, with the planar surface 2. This slot 10 is provided to be somewhat narrower at the upper end thereof to form opposed interior longitudinally extending guide-ways for the receipt of guides l2, 13 of a slide block M (Figure 3).

The slide block 14 is apertured centrally of the length thereof as shown (Figure 3) and receives in loose engagement therewith a screw Screw 15 is securely mounted in a boss-like protrusion id of a blade 1'7 having the form of a narrow thin longitudinally extending band. The boss-like protrusion 16 has a flat upper surface, while the lower surface of the slide block 14 is recessed upwardly to provide a central spacing, referred to hereinafter, between the protrusion and the slide block.

A nut 13 (Figure 1) threaded onto the upper end of the screw 15; engages the upper surface 11 of the frame 1 and is adapted to draw the upper side or face of blade 17 and slide block 14- abutted by the blade into tight fitting engagement with the frame.

The blade 1'7, protrusion 16, slide block 14, screw 15, and nut 18 form a carrier for a scribing point 19 mounted on the lower side or face of the blade, and loosening of the nut 155 permits the carrier as a unit to be slid longitudinally of the frame with the nut 18 frictionally engaging surface 11.

The scribing means or the scribing point 19 is suitably welded or otherwise fixedly secured to, and carried on, the blade 17 adjacent an extremity thereof indicated at Zli; as shown in the drawing the scribing point is integral with a disc which is soldered to blade 17. The blade extremity 20 comprises a tapered tongue portion (Figure 4) of the blade, which portion suitably extends well beyond the scribing point 19 positioned on the under side of the blade on the surface thereof remote from the guide 3 (Figure 1).

As may be seen from Figures 1 and 2 the tongue portion of the blade forms, with the vertically extending guides 35, '7, a seat for reception of a rim portion of a reference template shown at 8 in the former figure and at 9 in the latter figure.

The frame It carries an upstanding post 21 and the slide block 14 carries an upstanding post 22.. These posts provide means for measuring the displacement of the scribing point 19 relative to the vertically extending guides 3, 7.

in the preferred embodiment of the invention the posts support therebetwecn a micrometer indicated generally at 23. As shown in the drawings the post 21 has secured thereto a spindle 2d of the micrometer, the graduations extending from zero leftwardly, as shown in Figure l, and being indicated generally at 25.

The outer sleeve 26 of the micrometer is supported on the spindle and provided in the usual manner with indicia around the periphery thereof and with a conical end 27. For adjusting the micrometer the same is suitably provided at 28 with a xnurled surface portion. The conical end 27 of the micrometer is adapted to abut against a centering head 29 of a screw 3t", which passes through a threaded aperture of the post 22. A set screw 31 passes vertically through the post 22 to engage against and retain in fixed position the screw 30.

Referring now to Figure 1, it will be noted that the scribing point 19 shown in solid line is indexed directly beneath the guide nose 3 which is in engagement with the peripheral edge of a given template 8, while the tongue portion 20 extends beneath the rim portion of the template. The numeral 32 (Figures 1 and 4) designates a dotted line which the scribing point 19 is to scribe out on the base 33, the position of the scribing point for scribing the line 32 being indicated in dotted line in Figure 1.

To place the device in operation the micrometer 23 of the scribing device is zeroed with the scribing point 19 directly beneath the guide 3 and with the conical end 27 against the centering head 29. To bring the scribing point 19 into position to scribe the line 32 the outer sleeve of the micrometer is rotated (With the nut 18 loosened) to cause the post 22 to move and to thus move the carrier and the scribing point 19 thereon relatively to the guide 3. The scribing point then comes to this dotted line position of Figure 1.

In most instances in the airplane industry such movement of the scribing point will not be more than about of an inch.

With the desired distance attained between the posts and between the scribing point 19 and the guide 3, the nut 18 is tightened and the operator of the device, grasping the same in his hand, guides the device around the reference template 3 with the guide 3 in contact with the edge of the reference template and also with the tongue portion 20 extending beneath the reference template in contact therewith to provide a firm seat for the rim portion. The scribing point 19 then marks out on the template base 33 the desired line 32.

To scribe out a template which is smaller than a given or reference template the device of Figure 1 is rearranged, as shown in Figure 2. For this purpose the nut 18 is loosened and the blade 17 and the protrusion 16 are turned 180 degrees relative to the slide block 1 and the scribing point 19 is brought adiacent the guide 7.

With the scribing point 19 directly beneath the guide 7 and screw 18 loosened, the micrometer is zeroed and the centering head 29 is brought into engagement with the conical end 27 of the micrometer by adjusting the screw 30 into contact with the conical end.

With the nut 18 loosened to permit sliding movement of the carrier, the outer sleeve of the micrometer is then rotated relative to the spindle to cause the post 22 and the scribing point 19 together with the blade 1.7 to move leftwardly in Figure 2; blade 17 and scribing point 19 pass beyond the end of the frame 1 beneath the given template 9 and the seat 2d then extends well beneath the rim portion of the template 9 to provide for firm engagement of the device with the reference template. The

nut 18 is then tightened and the inside line 34 is scribed on the template form 35 by the operator who guides the device around the contour of the given template with the scribing point 19 in contact with the form.

The blade li'i, point it) and protrusion it? may be reversed 180 degrees from the Figure '1 position to the lit (.4, Figure 2 position by separating the components as shown in Figure 3 and effecting the reversal. However such is not necessary for the

surfaces

36, 37 of the protrusion 16, as shown in Figure 3, are arcuate and conform to the surfac defining the recess 38 of the slide block 14.

this slide block 14 is adapted to have the feet 39, 4t? thereof abut the blade 17 at either side of the

surfaces

36, 37 and the protrusion 16 is revolvable through 360 degrees past the feet. Thus by loosening nut 18 to the Y o. crew 15, the slide block may be dropped cry in slot 1% to provide the protrusion 16 below the surface 2, permitting turning of the blade and protrusion while the components are in loosely assembled relation.

Relative motion longitudinally of the device between the slide block and blade is prohibited by the engagement between the slide block and protrusion id in the assembled condition of the structure.

While irdependent zeroing of the tool for use from either end has been described, it is contemplated that in production of the tool the instrument would be zeroed at the factory and adjustment by the users would not normally be necessary.

To accomplish this the scribing point is initially aligned with the guide 7 and with the micrometer reading at zero the centering head 29 is brought into abutment with the conical end 27. Then with screw 18 loosened and the centering head 2 fixedly positioned the blade is reversed to bring the scribing point adjacent to guide 3. The guide 3 is then moved to align it exactly with the scribing point and the guide is secured in position by cap screw 5. Thereafter it will not generally be necessary to affect a re-alignmcnt.

The preferred embodiment of the invention shown in the drawing is in full size. In this connection it will be noted that the scribing point is extremely short and that the lower end of the scribing point is close to the horizontal plane of the seat. This provides for accuracy even should an operator inadvertently tilt the instrument slightly when in use.

There has thus been described a convenient device particularly useful in the production of templates. While in the preferred embodiment the device incorporates a micrometer, it will be recognized that the distance be tween the

posts

21, 22 may be conveniently set with other measuring instruments, and that incorporation of the measuring instrument in the scriber is beneficial though not a necessity.

It will be further understood that it is not necessary that the guide 3 be adjustably mounted with respect to the main frame portion, but such is desirable to attain precise alignment between the scriber point 19 and the guide means.

The major components of the device are preferably formed of tool steel, heat treated to prevent distortion of the components under conditions of long service.

It will be understood that this invention is susceptible to modification in order to adapt it to different usages and conditions and accordingly, it is desired to comprehend such modifications within this invention as may fall Within the scope of the appended claims.

I claim:

1. A scribing device, comprising in combination, a frame having a guide on each end thereof and a planar surface extending between the guides, the guides extending perpendicularly to said surface, the frame having a longitudinally extending slot therein, a longitudinally extending blade slidably disposed on said surface, said blade being slidable longitudinally of the frame and said blade having inwardly of an extremity thereof a scribing point fixed thereon on the side of the blade remote from the said surface, said blade having the extremity adapted to extend beyond a said guide to form therewith a seat, a boss-like protrusion on the blade extending into the slot of the frame, a screw extending from the protrusion was, 14.,

and through the slot, a retaining nut on the upper end of the screw and above the slot cooperable with the frame to retain the blade on the frame, a slide block loosely mounted on the screw over the protrusion and slidably engageable with the frame in the slot, a first post carried by the slide block and extending from the frame, a second post carried by the frame extending in parallel relation with the first post, the blade, screw and protrusion being reversible with respect to said slide block to provide said scribing point adjacent either guide.

2. A scribing device comprising a longitudinally extending frame having an upstanding pest and a longitudinally extending slot, a guide on an end of the frame beyond the post, a slide block in the slot and slidable therein longitudinally of the frame, said block having an,

upstanding post extending parallel to the post of the frame, the frame having a lower planar surface terminating at said guide, a thin blade carried by the slide block and in slidable contact with the said planar surface, the blade having an extremity adapted to extend beyond the guide to form therewith a seat, a scriber element on the blade on the side below said seat and positioned inwardly of the blade end and adapted to be aligned vertically with said guide, and a'rnicrometer extending longitudinally of the frame between the guide posts and operable to measure longitudinal displacement between said posts and between said guide and scribing element.

3. A scribing device comprising a longitudinally extending frame having an upstanding post and a longitudinally extending slot, a guide on an end of the frame beyond the post, a slide block in the slot and slidable therein longitudinally of the frame, said bloc; having an upstanding post extending parallel to the post of the frame, the frame having a lower planar surface terminating at said guide, a thin blade carried by the slide block and in slidable contact with the said planar surface, the blade having an extremity adapted to extend beyond the guide to form therewith a seat, a scriber element on the blade on the side below said seat and positioned inwardly of the blade end and adapted to be aligned vertically with said guide, and means extending longitudinally of the frame between the posts and operable to measure longitudinal displacement between said posts and between said guide and scribing element.

References Cited in the file of this patent UNITED STATES PATENTS 70,937 Ames Nov. 19, 1867 396,371 Ross Jan. 15, 1889 549,513 Holmes Nov. 12, 1895 560,781 Conway W May 26, 1896 2,243,778 Stansel May 27, 1941 2,344,724- Phillips Mar. 21, 1944 2,577,334 Kozlowski Dec. 4, 1951 FOREIGN PATENTS 343,417 Germany Oct. 27, 1921