US2337602A - Detachable card for gyro turn units of automatic pilots - Google Patents

Description

Dec. '28, 1943. R. HElNTZ 2,337,602

DETACHABLE CARD FOR GYRQ TURN UNITS OF AUTOMATIC PILOTS Filed 061;. 21. 1942 2 Sheets-Sheet 1 i HHHHIHIllI|III\IllllllllHIHHlHll] 6 3' 0' 33 3o IN VEN TOR.

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A T TOENE X Dec. 28, 1943. R. M. HElNTZ DETACHABLE CARD FOR GYRO TURN UNITS OF AUTOMATIC PILOTS Filed Oct. 21 1942 2 Sheets-Sheet 2 IN VEN TOR. P44 PH M HE/NTZ.

A T TOE/V5)- Patented Dec. 28, 1943 DETACHABLE CARD FOR GYRO TURN UNITS OF AUTOMATIC PILOTS veland, Ohio, assignor to Bedford, Ohio, at corpora- Ralph M. Heintz, Cle

Jack & Heintz, Inc., tion of Ohio Application October 21, 1942, Serial No. 462,810

1 Claim.

This invention relates in general to automatic pilot turn units and more particularly to improvements in the construction and assembly of the upper card thereof.

One of the primary objects of the invention is to so construct the upper card with respect to the assembly that it may be readily detachably installed after the remaining assembly is intact in order to obviate the possibility and likelihood of damaging or destroying the card that often occurs with the present day' conventional practice of securing the card to the parts prior to assembly.

With the foregoing and other objects in view, the invention resides in the combination of parts and in the details of construction hereinafter set forth in the following specification and appended claims certain embodiments thereof being illustrated in the accompanying drawings, in which:

Figure 1 is a view in elevation of the assembly with the upper card installed;

. card is fixed to the cut-ofi ring prior to assembly Figure 2 is a bottom plan view of the gearv carrying the air pick-off unit, showing the card attached thereto;

Figure 3 is a view similar to Figure 2 illustrating the assembly relation of the parts shown in Figure 2;

gigure 4 is a view in perspective of the card: an

Figure 5 is a view in section taken along line 4-4 of Figure 2.

Referring more particularly to the drawings, the directional gyro unit of the general character shown in Figures 6 and 'I of the U. S. patent to Sperry et al., #1,992,970, March 5, 1935, generally indicated at I, spins about a horizontal axis 2 and is mounted on pivots 3 in the gimbal frame l, the latter being provided with vertical trunnions such as 5. The lower card 6 is suitably releasably fixed to the gimbal in the conventional manner, the .gimbal also carryin the usual shroud, not shown, for the air pick-off.

The usual air valve gear I has aiiixed on its under side by screws 8, 9 and III the usual air pick-oi! unit generally indicated at II in proper relation to its shroud.

As is well understood in the art, it is of utmost importance to insure proper alignment of the shroud carried by the gimbal and the air pick-oil carried by the air valve gear. The cards are of fragile material and the upper card, generally indicated at it is between the cut-oi! gear and and consequently interferes materially with the proper alignment of the air pick-ofi and its shroud and attempts at assembly or adjustment of the same has often resulted in damage and destruction of the upper card necessitating rearssembly and replacement of parts.

To avoid this the improved upper card forming part of this invention is constructed in the manner shown in Figure 4 in which the upper reduced portion l3 provided with a cut out portion It with adjacent apertures l5 and IS in its upper lips and a recessed portion I! with adjacent apertures l8 and iii.

In Figure 2 the upper card is shown in assembled position with screws 20 and 2| passing through apertures i5 and i6 and screws 22 and 23 pass through apertures l8 and I9 to secure the upper card to the air pick-off and thus to the air valve gear to rotate therewith relatively to the lower card. By reason of the particular relationship of the assembly described the installation and removal of the upper card may be accomplished after the remaining assembly operation and without disturbance thereof. In Figure 3 the upper card l2, i3 is shown in assembly relation with respect to the air valve gear and air pick-off, showing its relationship theretoin near position for slight movement into alignment with the securing screws carried by the air pick-off and subsequent attachment as shown in full lines of Figure 2.

I claim:

In combination in a turn unit for automatic pilots, a directional gyro assembly including a gyro pivoted in a gimbal frame mounted for vertical axis rotation, -a lower card carried by said gimbal, an air cut-off gear and an air pickoff unit detachably secured to the under side of said gear and arranged above said lower card, an upper card and complementary attachment means thereon and on said pick-oil unit for detachably securing said upper card thereto, said upper card having a cut-out portion to permit sliding movement thereof between said pick-off unit and air cut-off gear into position for detachable attachment to said unit after the installation of said gear in said turn unit.

RALPH M. HEINTZ.

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