Patent GB-294189-A (GB)
Abstract: 294,189. Cool, H. R. April 20, 1927. Indicating and recording rest or motion; vibrations, recording.-In a device of the type described in Specification 157,458 for recording the periods of duty or idleness of a vehicle or machine improved means are provided for attaching and operating the record disc, for securing the operating parts in the casing, and for preventing shock to the said parts. As shown in Figs. 1 and 5, the casing comprises a body part 1 with a hinged cover 3 the part 1 containing the operating pendulum 8 which carries the stylus 7 and the cover 3 containing the clockwork mechanism 4. The pendulum is supported by a hard metal pivot pin 39 mounted in a member 40 made from a single strap of metal and bent to the form shown in Fig. 5 and secured to the part 1 by a screw 42, a compression spring 44 surrounding an adjusting screw 45 being provided to regulate the pressure on the pivot pin. The stylus 7 is adapted to press the record-disc 6 against a resilient backing and excess movement of the pendulum is prevented by a rubber washer 48 on a stud 47. The record-disc 6 is mounted on the clock spindle 5 which is provided with a shoulder 16, Figs. 5 and 9, forming a seat for the hub 19 of a disc 17 on which the record-disc rests, the record-disc being held thereon by a pair of arms 20 confined in recesses in the hub 19 and having extensions 21 engaging leaf springs 22. The arms are movable from the dotted to the full line position Fig. 5 for the purpose of facilitating the assembly and retention of the record-disc. The disc 17 is provided with peripheral lobes 18 to enable it to be turned to wind the clock mechanism. A name plate 23 or other identifying device is mounted in an aperture of the cover 3, the plate being provided with four recesses 25, Fig. 8, for co-operation with lugs 26 on the cover, one pair being larger than the others for correctly mounting the plate. A split spring ring 28 is provided to hold the plate in position and the edges of the plate may be coated with wax as a means to detect tampering. A cushioning disc 29 of felt is placed between the plate 23 and the clock casing and the casing is provided with a flange 30 adapted to be removably held in the cover by means similar to that described for the plate 23. Barrel and cylindrical hinges.-The pivot connection between the two parts of the casing is formed by hollow cylindrical members 50, 51, Fig. 2, through which passes a hinge pin 52. The opening in the member 50 is larger than the pin and is provided with sleeves 53 separated by a compression spring 54 adapted to press the sleeves against friction washers 55 to hold the parts in any position to which they may be turned. A projection on each washer enters a corresponding recess in the members 51 to prevent turning thereof. Locks, revolving-barrel.-A lock of the radial pin-tumbler type is provided comprising a barrel 60, Figs. 4, 5, and an offset 61 pushed into a recess on the cover 3 between two T-shape plates 62 with bent over ends 63 to hold the lock in position. The key rotated member has an inwardly extending portion 64 to which is attached a cam plate 65 adapted to engage a recess of a part 77 on the other member 1 of the casing. The edge of the casing is sealed against dirt &c. by a rubber tube 57 lying in a groove on one member of the casing.