Telephone set

Claim 2

A telephone set comprising: a handset; a base unit for mounting said handset thereon; said base unit having a front part provided with a protrusion extending substantially rearward; a locking piece provided on said base unit and having a front and a rear part, said front part being tapered with an upper slant surface and lower slant surface, wherein said locking piece extends forward towards said protrusion; a spring for pushing said locking piece forward; a housing integral with the base unit for receiving the spring and a rear end of the locking piece; a buffer member having a resiliency, provided on said base unit between said locking piece and said protrusion; a front dent provided on the front part of said handset to engage said protrusion; and a rear dent provided on said handset to engage said locking piece; whereby said front dent is made to engage said protrusion, then said handset is rotated about said protrusion in engagement with said front dent to press said buffer member, and then said rear dent is made to engage said locking piece such that locking piece initially engages said handset with the upper slant surface.

Claim 3

The telephone set according to claim 1, wherein the rear dent of the handset has a lower edge in engagement with the lower slant surface of the locking piece when either the handset is pushed upwardly by the buffer member or the handset is being removed from the base unit.

Claim 4

The telephone set according to claim 2, wherein said locking piece has a stem part extending through an aperture in the base unit, said stem part being in engagement with an upper edge of said aperture, a lower edge of said aperture and an upper surface of the housing.

Claim 5

The telephone set according to claim 3, wherein the upper edge of the aperture is positioned midway along a length of the locking piece between said lower edge of the aperture and the upper surface of the housing.

Claim 6

The telephone set according to claim 1, wherein said locking piece has an upper rear edge which engages the base unit to prevent movement of the locking piece beyond a predetermined position despite pushing by the spring when said handset is removed from the base.

Claim 7

A telephone set comprising: a handset having a front convex part and a rear convex part, which are connected by a trunk part, said front convex part having a bottom and a wall including a front part and a rear part; a base unit having an enclosure which has a front recess and a rear recess for receiving said front convex part and said rear convex part, respectively; said front recess being defined by a bottom and a wall including a front part and a rear part; a protrusion provided on said front part of said wall of said front recess of said base unit, said protrusion extending substantially rearward; a locking piece provided to extend through an aperture provided through said enclosure at said rear part of said wall of said front recess, said locking piece extending toward said protrusion and having a tapered part with an upper slant surface and a lower slant surface; a spring disposed in said enclosure for engaging an end of the locking piece and for pushing said locking piece toward said protrusion and permitting retraction of said locking piece into said enclosure of said base unit; a housing integral with said enclosure, said housing receiving the spring and the end of the locking piece; a buffer member having a resiliency, provided on said bottom of said front recess; a front dent provided on said front part of said front convex part of said handset to engage said protrusion; and a rear dent provided on said rear part of said front convex part of said handset to engage said locking piece; whereby said front dent is made to engage said protrusion, then said handset is rotated about said front dent in engagement with said protrusion, so that said rear part of said wall of said front convex part pushes the upper slant surface of said locking piece to cause retraction of said locking piece and said bottom part of said front convex part presses said buffer member, and when said handset is fully inserted said locking piece is moved forward so that it projects into said rear dent for engagement therewith.

Claim 8

A telephone set comprising: a handset having a front convex part and a rear convex part, which are connected by a trunk part, said front convex part having a bottom and a wall including a front part and a rear part; a base unit having an enclosure which has a front recess and a rear recess for receiving said front convex part and said rear convex part, respectively; said front recess being defined by a bottom and a wall including a front part and a rear part; a protrusion provided on said front part of said wall of said front recess of said base unit, said protrusion extending substantially rearward; a locking piece provided to extend through an aperture provided through said enclosure at said rear part of said wall of said front recess, said locking piece extending toward said protrusion and having a tapered part with an upper slant surface and a lower slant surface; a spring disposed in said enclosure for engaging an end of the locking piece and for pushing said locking piece toward said protrusion and permitting retraction of said locking piece into said enclosure of said base unit; a housing integral with said enclosure, said housing receiving the spring and the end of the locking piece; a buffer member having a resiliency, provided on said bottom of said front recess; a front dent provided on said front part of said front convex part of said handset to engage said protrusion; and a rear dent provided on said rear part of said front convex part of said handset to engage said locking piece; whereby said front dent is made to engage said protrusion, then said handset is rotated about said front dent in engagement with said protrusion, so that said rear part of said wall of said front convex part pushes the upper slant surface of said locking piece to cause retraction of said locking piece and said bottom part of said front convex part presses said buffer member, and when said handset is fully inserted said locking piece is moved forward so that it projects into said rear dent for engagement therewith.

Claim 9

The telephone set according to claim 6, wherein said rear dent of said front convex part has a lower edge which is in engagement with said lower slant surface of said tapered part of said locking piece when said front convex part is pushed upward either by the action of said buffer member or when said handset is being removed from said base unit.

Claim 10

The telephone set according to claim 6, wherein said locking piece also has a stem part abutting an upper edge of said aperture, a lower edge of said aperture and an upper surface of said housing.

Claim 11

The telephone set according to claim 8, wherein said upper edge of said aperture is positioned midway along a length of said locking piece between said lower edge of said aperture and said upper surface of said housing.

Claim 12

The telephone set according to claim 6, wherein said wall of said front convex part of said handset is a sloping wall tapered toward said bottom.

Claim 13

The telephone set according to claim 6, wherein said bottom of said front convex part of said handset has a concave depression, and said buffer member has an upwardly extending convex part which conforms to said concave depression in said bottom of said front convex part.

Claim 14

The telephone set according to claim 6, wherein said buffer member is formed of rubber or sponge.

Claim 15

The telephone set according to claim 6, wherein said base unit has a central elevated part between said front recess and said rear recess, and a lifter provided in said central elevated part which pushes up said trunk part of said handset.

Claim 16

The telephone set according to claim 6, wherein said base unit further comprises an anti-vibration pad which is provided in said rear recess, and has a part which is elongated vertically and has a tip to abut said rear convex part of said handset.

Claim 17

The telephone set according to claim 6, wherein said handset further comprises a depression in said trunk part, and said base unit further comprises a positioning projection which engages said depression in said trunk part of said handset.

Claim 18

The telephone set according to claim 6, wherein said protrusion is provided at about the upper extremity of said front part of said front recess of said base unit.

Claim 19

The telephone set according to claim 6, wherein said locking piece has an upper rear edge which engages the enclosure of the base unit to prevent movement of the locking piece into the front recess of the enclosure beyond a predetermined position despite pushing by the spring when the handset is removed from the base unit.