Hand stamp

Abstract: Hand stamp including a stamp pad (10), a holder plate (11) supporting this, a shaft (15) connected the holder plate, a cover (17) which surrounds the holder plate (11) and the shaft (15) as well as a shaft knob (20) connected to the shaft, which against spring action can achieve a depression of the shaft (15) and the holder plate (11) with the stamp pad (10) connected to said shaft. To achieve a self adjusting contact pressure of the stamp pad the holder plate (11) is axially displaceable relatively the shaft (15), against the action of a spring (16)

Description: The present invention refers to a hand stamp including a stamp pad, a holder plate supporting the same, a shaft connected to the holder plate, a cover which surrounds the holder plate and the shaft, which cover exhibits a first opening, which exposes the stamp pad and a second opening through which the shaft extends, a shaft knob connected to the shaft, a first spring, arranged between said shaft knob and the cover, a second spring, whereby the holder plate is axially displaceable relatively the shaft, due to the action of a spring. Background of the invention Most of the hand stamps on the market of the type stated above exhibit a mechanical adjusting means to adjust the position of the holder plate and thereby the position of the stamp pad relatively the cover. Thereby the contact pressure of the stamp pad can be varied, from a lower pressure at a new pad saturated with stamp ink to a higher pressure at a used pad, which might have been compressed after a periodical use. It has however shown that extremely few users are familiar with this mechanical adjusting means and therefore do not use the same, which naturally implies a lower utilisation factor of the stamp pad and the stamp ink. JP 55-51578 discloses a hand stamps, to provide an ink-immersed foamed seal body fitted slidable and loose tubular body with a compressed spring placed therebetween, capabel of stampling whithout supplying ink for a long period. FR-1427968 discloses a hand stamp including a stamp pad, a holder body having a holder plate, a shaft connected to the holder plate, a cover surrounding the holder plate and the shaft having a knob. One end of the shaft and a spring is provided in the holder body. A pressure on the shaft affects the the spring in the holder body and presses down the holder body and the holder plate, provided with stamp pad. The object of the invention and most important features The object of the present invention is to provide a hand stamp of the above stated type, which is self adjusting concerning the contact pressure of the stamp pad. This has been solved by the shaft being partly hollow, provided with a collar at one end, that the holder plate is provided with attachment having a pair of resilient tongues intended to be snap locked behind corresponding shoulders of the collar, through insertion therein to dismantlably and resiliently mount the shaft to the holder plate, and that between the collar and the holder plate the spring is mounted. Specification of the drawings In the following the invention will be described in closer detail with reference to an embodiment shown in the enclosed drawings. Fig. 1 is an exploded view of a hand stamp according to the invention. Fig. 2 discloses the hand stamp according to fig. 1 in an assembled position. Specification of embodiments The stamp according to fig. 1 and 2 includes a stamp pad 10, which is supported by a holder plate 11. This exhibits on the top an attachment 12 in the shape of a pair of resilient tongues provided with shoulders 13 which can be snapped on behind shoulder surfaces 14 of a shaft 15, which is at least partly hollow (15a). A coil spring 16 is clamped between the holder plate 11 and a collar 22 of the shaft 15 and positioned about the attachment 12, which means that the holder plate 11 via its attachment 12 is inserted into and resiliently pivoted to the shaft 15 in its axial direction. A cover 17 surrounds the holder plate 11 and the shaft 15 and has a lower opening 18 which exposes the stamp pad 10 and an upper opening 19 through which the upper end of the shaft 15 extends, which end is connected to a shaft knob 20. The shaft knob 20 can against the action of a coil spring 21 be pressured downwards above the cover 17 and hereby via the shaft 15 press out the holder plate 11 and stamp pad 10 supported by this from the cover 17. The holder plate 11 resilient by its center entails that one always obtains a constant contact pressure and thereby a perfect print regardless of the thickness of the stamp pad 10. Furthermore, the pressure is not influenced even if the stamp is pressed downwards slightly inclined. The invention is naturally not limited to the embodiment shown but a number of variants are conceivable within the scope of the patent claim.

Claims: Hand stamp including a stamp pad (10), a holder plate (11) supporting the same, a shaft (15) connected to the holder plate, a cover (17) which surrounds the holder plate and the shaft, which cover exhibits a first opening (18) which exposes the stamp pad (10) and a second opening (19) through which the shaft (15) extends, a shaft knob (20) connected to the shaft, a first spring (21), arranged between said shaft knob (20) and the cover (17), a second spring (16), whereby the holder plate (11) is axially displaceable relatively the shaft (15), due to the action of said second spring (16), characterized in that the shaft (15) is partly hollow (15a) and provided with a collar (22) at one end, the holder plate is provided with attachment (12) having a pair of resilient tongues (13) intended to be snap locked behind corresponding shoulders (14) of said collar (22) through insertion therein to dismantlably and resiliently mounting the shaft (15) to the holder plate (11), and between the collar (22) and the holder plate (11) said second spring (16) is mounted.

Inventors: BENGTSSON LARS, BENGTSSON, LARS
Applicants: UNIGRAPHICS MARKING SYSTEMS AB
Application year: 1992
Main classification: B41K1
IPC codes: B41K1